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Tytuł:
The technical object reliability evaluation based on the parametric and momentary failures
Autorzy:
Lindstedt, P.
Manerowski, J.
Borowczyk, H.
Powiązania:
https://bibliotekanauki.pl/articles/242760.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
reliability
Weibull function
parametric failure
momentary failure
Opis:
The presented paper concerns with the technical object reliability evaluation based on the parametric and momentary failures during the process of object operating. The real world data observation shows that in the case of high quality technical objects the catastrophic failure events are too rare to the credible evaluation of the object’s reliability. For that reason, the parametric and momentary failures are in the centre of attention in this paper. The set of analysed failures was obtained with the classifiers of the field data provided by the monitoring system (the failure alarms) and the diagnostic system (the functional and technical condition parameters deviation). The changes of the functioning condition potential are used to determine the symptoms of momentary failures and the changes in the potential of the technical condition to determine the symptoms of parametric failures (non-total). The assumed reliability characteristics model has the form R(t) = f(_, Rb(t), Rc(t)), (where: Rb(t) and Rc(t) – the estimators of reliability for parametric and momentary failures, symbol ‘_’ denotes catastrophic failures not covered). For the identification of R (t) as an analytical function, the estimators are computed with the field data. The Weibull distribution function due to its flexibility is often used. Such is the case in this paper. Two parameters a and b known as the scale and the shape parameters are estimated with the computerized procedure realizing least-square method. The presented examples show good fit quality even for small set of data.
Źródło:
Journal of KONES; 2016, 23, 2; 239-246
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fertilization failure and early embryonic mortality as a major cause of reproductive failure in cattle: A review
Autorzy:
Sayid, Ali
Powiązania:
https://bibliotekanauki.pl/articles/1193470.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Bovine
Embryo mortality
Fertilization failure
Reproductive failure
Opis:
Reproductive failure in lactating dairy cows is a significant limitation to the dairy industry. Fertilization failure, Embryonic or fetal losses are major contributors to that limitation. The objective of this review was to determine cause of fertilization failure and early embryonic mortality in cattle. Fertilization failure and embryo mortality is a major cause of economic loss in dairy production systems. Direct effects of fertilization failure and embryo mortality are reflected in reduced conception rates with consequent effects on efficiency, production and profitability. Embryonic loss can be early or late .The major component of embryo loss occurs before day 16 following breeding with emerging evidence of greater losses before day 8 in high producing dairy cows. Late embryo loss causes serious economic losses because it is often recognized too late to rebreed females. Various factors can be a cause for fertilization failure and embryonic mortality. The major cause includes genetic, environmental, endocrine, infectious nutritional factors. More balanced breeding strategies with greater emphasis on fertility, feed intake and energy must be developed. There is a range of easily adoptable management factors that can either directly increase in embryo survival or ameliorate the consequences of low embryo survival rates. The correction of minor deficits in several areas can have a substantial overall effect on herd reproductive performance.
Źródło:
World Scientific News; 2021, 158; 59-71
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mean time to failure for periodic failure rate
Autorzy:
Tanguy, C.
Powiązania:
https://bibliotekanauki.pl/articles/2069664.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
reliability
mean time to failure
periodic failure rate
Opis:
The paper is concerned with the determination of the Mean Time To Failure (MTTF) in configurations where the failure rate is periodical. After solving two configurations exactly, we show that when the period of the failure rate oscillations is small with respect to the average failure rate, the MTTF is essentially given by the inverse of the average failure rate, give or take corrections that can be expressed analytically. This could be helpful in the description of systems the environment of which is subject to changes.
Źródło:
Journal of Polish Safety and Reliability Association; 2009, 2; 361--366
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Likelihood of a failure of a damming structure
Autorzy:
Opyrchał, L.
Hrabowski, W.
Jankowski, W.
Powiązania:
https://bibliotekanauki.pl/articles/241512.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
failure risk
dam
Opis:
Having an analysis of real breakdowns and damages in Polish damming structures as a basis, and assuming the probability of controlling freshet as a unit, one can calculate the probability of failure of a hydro-technical structure, due to failure of the base, the draining system, anti-filtering safety appliances, the body or the abutments. The results obtained af-ford an estimation of failure risk at any moment of the structure's opera-tion and an estimation of the overall failure probability. The calculations were carried out for all dam classes. When the dam's elements are in good condition, the overall failure probability is by one order of magni-tude greater than the probability that a controlling freshet will occur.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2003, 50, 2; 141-146
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on failure rate of the mixture of an exponential distribution and distribution with increasing quadratic failure rate function
Autorzy:
Knopik, L.
Powiązania:
https://bibliotekanauki.pl/articles/206455.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
mixture of distributions
quadratic failure rate function
failure rate function
Opis:
We show that a unimodal failure rate function can be obtained as a mixture of two increasing failure rate functions. Specifically, we study the failure rate of the mixture of an exponential distribution and an IFR (increasing failure rate) distribution with increasing quadratic failure rate function. At the end of the paper we show a numerical example of the modified unimodal failure rate function.
Źródło:
Control and Cybernetics; 2017, 46, 3; 291-297
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for assessing of ship fuel system failures resulting from fuel changeover imposed by environmental requirements
Autorzy:
Kowalak, Przemysław
Myśków, Jarosław
Tuński, Tomasz
Bykowski, Dariusz
Borkowski, Tadeusz
Powiązania:
https://bibliotekanauki.pl/articles/2038055.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
failure frequency
fuel changeover
fuel system failure
emission control area
Opis:
Environmental regulations instigated the technological and procedural revolution in shipping. One of the challenges has been sulfur emission control areas (SECA) and requirement of fuel changeover. Initially, many reports anticipated that new grades of low sulfur fuels might increase various technical problems in ship operation. This research develops a simple and easy to use method of the failure severity and intensity assessment in relation to fuel changeover. The scale of failure rate in the ship’s fuel system was evaluated qualitatively and quantitively, using developed failure frequency indicator and the time between failure. Based on 77 records of fuel system failures collected on seven ships, it has been found that frequency of failures related to SECA fuel changeover is on average nearly three times higher compared to the rest of sailing time. Their severity did not significantly change, but the structure of failures changed considerably. The method and presented results may help in improvement of ship’s systems design and on-board operational procedures.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 4; 619-626
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards a High Reliable Enforcement of Safety Regulations - A Workflow Meta Data Model and Probabilistic Failure Management Approach
Autorzy:
Thimm, H. H.
Powiązania:
https://bibliotekanauki.pl/articles/136152.pdf
Data publikacji:
2016
Wydawca:
EEEIC International Barbara Leonowicz Szabłowska
Tematy:
Environmental Health and Safety
workflow management
workflows
failure detection
failure prediction
Opis:
Today’s companies are able to automate the enforcement of Environmental, Health and Safety (EH&S) duties through the use of workflow management technology. This approach requires to specify activities that are combined to workflow models for EH&S enforcement duties. In order to meet given safety regulations these activities are to be completed correctly and within given deadlines. Otherwise, activity failures emerge which may lead to breaches against safety regulations. A novel domain-specific workflow meta data model is proposed. The model enables a system to detect and predict activity failures through the use of data about the company, failure statistics, and activity proxies. Since the detection and prediction methods are based on the evaluation of constraints specified on EH&S regulations, a system approach is proposed that builds on the integration of a Workflow Management System (WMS) with an EH&S Compliance Information System. Main principles of the failure detection and prediction are described. For EH&S managers the system shall provide insights into the current failure situation. This can help to prevent and mitigate critical situations such as safety enforcement measures that are behind their deadlines. As a result a more reliable enforcement of safety regulations can be achieved.
Źródło:
Transactions on Environment and Electrical Engineering; 2016, 1, 4; 19-28
2450-5730
Pojawia się w:
Transactions on Environment and Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The study on algorithm for identification the fatigue crack length of compressor blade based on amplitude-frequency resonant characteristics
Autorzy:
Lichoń, D.
Bednarz, A.
Powiązania:
https://bibliotekanauki.pl/articles/243684.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
fatigue failure
crack length
compressor blade
aircraft engine
failure identification algorithm
Opis:
The article is focused on building the algorithm for identification the fatigue crack length in the first stage of compressor blade of the helicopter PZL-10W turbo-shaft engine. The fatigue wear of compressor blade is a process in which the fatigue crack begins at the structural notch of the working part. For compressor blade, the crack starts at the leading edge and progress along the blade chord. Due to working conditions, the compressor blades are referred to as critical components. The helicopter rotor downwash can easily lift particles form the ground that may cause damages in the compressor section. Aircraft engines are designed so that the rotational speed of impeller remains below the resonant frequency. However, the pulsation of working medium or mechanical vibrations may cause temporary increase of vibration frequency. The appearance of structural notch combined with temporary increase of vibrations may initiate the fatigue failure. The works undertaken at the Department of Aircraft and Aircraft Engines, Rzeszow University of Technology provided a wide spectrum of research data of amplitude-frequency (A-F) characteristics of 1st stage of compressor blade. For different crack lengths, the fatigue tests of resonant frequency and asymmetry of A-F characteristics were acquired. The crack lengths were measured by fluorescent or infrared mapping method. The aim of the article is to develop the numerical method for identification of crack length of compressor blade basing on A-F characteristics. The studies on A-F characteristics in order to find correlations between crack length, resonant frequency and characteristics asymmetry were performed. The next step was to build the algorithm for identification the crack length when only A-F characteristic is known. The article contains the description of researches background, A-F characteristics unique features, algorithm detailed methods of work and sample use of algorithm in identification the crack length.
Źródło:
Journal of KONES; 2017, 24, 4; 157-164
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Factors of Failure in Innovative Business Activities in Sanandaj
Autorzy:
Abdolmalaki, Kazhal
Gholipour, Rahmatolah
Ma’roofi, Fakharadin
Powiązania:
https://bibliotekanauki.pl/articles/1190165.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Innovation
failure of innovative business activities
factors of innovative activity failure
Opis:
The aim of this study was to analyze the reasons affecting the failure of innovative business activities in Sanandaj. The population of this research consisted of 150 managers and experts who did not have innovation in their businesses or had some kind of unsuccessful experience in this field. Mostly, the activities of these businesses were in the field of metal industry, packaging, textile, wood and automotive downstream industries. Among this population a sample of 105 people were chosen by using simple random sampling method. The aim of this study is functional and the data collection was descriptive and correlational. The main tools for collecting data were library resources and standard innovation failure factors questionnaire Wyckoff, and innovation questionnaire, on the basis of Likert scale. Data obtained from the questionnaire were analyzed by using descriptive statistics (mean, percentage, and standard deviation), inferential statistics (Pearson correlation and Structural Equation Modeling (SEM)) and SPSS and AMOS software. Results of the conducted analysis showed that all six factors are effective in the failure of innovative business activities in the city of Sanandaj. The results of Structural Equation Modeling indicated that poor management is more effective than other factors in the failure of activities.
Źródło:
World Scientific News; 2016, 42; 306-316
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation into a Potential Reduction of FMEA Efforts Using Action Priority
Autorzy:
Barsalou, Matthew
Powiązania:
https://bibliotekanauki.pl/articles/2201159.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FMEA
failure modes and effects analysis
risk analysis
failure prevention
quality
Opis:
FMEAs have been prioritized using RPN; however, a new standard has introduced AP for prioritization. This study seeks to determine if the number of required improvement actions increases, decreases, or stays the same when using AP in place of RPN. Statistical software was used to simulate 10,000 combinations of severity, occurrence, and detection. Both AP and RPN were calculated for the 10,000 combinations. Statistical hypothesis testing was performed to determine if there was a difference between RPNs when sorted by AP and to determine if there was a difference in actions required using RPN or AP. There is a statistically significant difference between RPNs when sorted by high, medium, and low AP. Using an RPN threshold equal to or greater than 100 would result in no change in the number of actions required if prioritizing by high and medium, but would result in fewer actions required if only high is used.
Źródło:
Management and Production Engineering Review; 2022, 13, 4; 59--71
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of continuous damage deactivation on yield and failure surfaces
Autorzy:
Cegielski, M.
Ganczarski, A.
Powiązania:
https://bibliotekanauki.pl/articles/387329.pdf
Data publikacji:
2007
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
damage
damage deactivation
failure
Opis:
This article deals with the modeling of the continuous damage deactivation affected yield surfaces of copper and failure surfaces of mortar, from the viewpoint of continuum damage mechanics. The concept of damage deactivation is adapted to Tresca-Guest and Huber-Mises surfaces and two models are presented: the classical discontinuous one, in which microcracks close instantaneously, and the new continuous one, in which they close gradually. The results for both models are compared and verified in order to achieve the best fitting the experimental data. Detailed quantitative and qualitative analysis of obtained solutions confirms the necessity and correctness of an application of the continuous damage deactivation concept.
Źródło:
Acta Mechanica et Automatica; 2007, 1, 2; 15-18
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Engineering availability of aircrafts
Autorzy:
Lewitowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/242226.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport
aircraft
diagnostic
failure
Opis:
Engineering availability and operational readiness of an aircraft are requisites for its ability to operate. After the aircraft has been supplied, both features determine airworthiness of the aircraft, in compliance with the ARC (Airworthiness Review Certificate). Improvement in methods of maintaining the aircraft availability proceeds in compliance with the MSG (Maintenance Steering Group) rules. The paper has been intended to outline the process of maintaining the engineering availability of the aircraft, with account taken of: aircraft maintainability, importance of the engineering diagnostics, and evaluation ratesfor dijferent maintenance patterns. Maintaining technical ability/ airworthiness of an aircraft, ground service of aircrafts, service-friendliness of an aircraft, unfitness and damages to an aircraft, ground diagnostic andprovision equipment for A-380, computer aided verification of an inspection of a front undercarriage (B) of an aircraft (A) and service of the B-787 aircraft (C), percentage for composite material portion in the structure of some aircrafts and helicopters, positions of composite material airframe elements in B-75 7/7 67, B-777, B-787 are presented in the paper.
Źródło:
Journal of KONES; 2009, 16, 2; 255-262
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of fishing basin construction on the behaviour of a footbrdge over the port channel
Autorzy:
Pyrzowski, Ł.
Miśkiewicz, M.
Chróścielewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/260413.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
footbridge
port basin
failure
Opis:
The paper analyses possible causes of failure of the rotating footbridge over the Ustka port channel. In July, 2015, strange behaviour of this object was observed in the form of excessive vibrations of bridge platform suspension rods, with the accompanying acoustic effects. A preliminary geotechnical analysis has revealed that this destructive effect was caused by the nearby construction works, namely construction of a fishing basin and communication routes in the area close to the bridge, which affected the bridge lashing rod foundation settings. Ground vibrations generated by certain construction activities were likely to have direct impact on decreasing the bearing capacity of these rods and increasing the susceptibility od the piles to extraction. After detecting the above problems in bridge operation, its geodetic monitoring was started. The data recorded during this monitoring, along with the results of force measurements in the rods, have made the basis for a series of numerical simulations, performed in the Finite Element Method (FEM) formalism. The bridge structure was analysed in the conditions defined as the emergency state. Extreme efforts of bridge elements and its dynamic characteristics were examined. A possible source of strange behaviour of the footbridge during its operation which was recognised during these simulations was the coincidence of the global natural frequency of the entire bridge structure with local vibrations of suspension rods, at the frequency approximately equal to 1 Hz. This situation was likely to lead to the appearance of the so-called internal resonance phenomenon. As a final conclusion of the research, recommendations were formulated on possible object oriented corrective actions.
Źródło:
Polish Maritime Research; 2017, S 1; 182-187
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Postoperative Acute Respiratory Failure In Patients Treated Surgically For Goiters
Autorzy:
Buła, Grzegorz
Mucha, Ryszard
Paliga, Michał
Truchanowski, Witold
Gawrychowski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1395678.pdf
Data publikacji:
2015-07-01
Wydawca:
Index Copernicus International
Tematy:
goiter
acute respiratory failure
Opis:
The aim of the study was to present a clinical picture, treatment and prognosis regarding patients who developed acute respiratory failure (ARF) while treated surgically for a goiter. Material and methods. A total of 3810 patients were treated for goiters between 2008 to 2013. Symptoms of postoperative ARF were recognized in 39 (1%) patients. Results. Symptoms of postoperative ARF were a postoperative hemorrhage in 31 (79.4%), lymphorrhagia in 1 (2.6%), bilateral paralysis of recurrent laryngeal nerves in 6 (15.4%) and acute circulatory – respiratory failure in 1 (2.6%). Postoperative hemorrhage appeared in 19 patients operated for nodular goiter, 4 with a retrosternal nodular goiter, 1x nontoxic recurrent retrosternal nodular goiter, 1x toxic recurrent retrosternal goiter nodular goiter, 2x Graves'goiter and 4x with malignant goiter. The cause of hemorrhage was parenchymal bleeding from the stumps and / or short neck muscles (29x), arterial bleeding (1x) and bleeding into the subcutaneous tissue (1x). Massive lymphorrhagia appeared as a result of damage to the thoracic duct after total thyroidectomy due to papillary thyroid carcinoma with cervical lymph node dissection on the left side. All patients who were diagnosed with bilateral paralysis of RLN, tracheostomy was performed. Of all 39 patients who underwent surgery two died – one in 6 days after surgery due to myocardial infarction, and another as a result of micropulmonary embolism and acute circulatory – respiratory failure in 18 hours after surgery. Conclusions. 1. The most frequent causes of acute respiratory failure in postoperative period are a hemorrhage from the operation site and bilateral paralysis of recurrent laryngeal nerves. 2. Acute postoperative respiratory failure is an indication for postoperative wound revision
Źródło:
Polish Journal of Surgery; 2015, 87, 7; 331-335
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czy możliwa jest budowa teorii moralnej zawodności rynku?
Is it possible to build a moral theory of market failure?
Autorzy:
Rogowski, Robert
Powiązania:
https://bibliotekanauki.pl/articles/653177.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
market
person
market failure
Opis:
Economics and ethics are practical sciences. The common research subject of both sciences is man. Economics is looking for an answer to the question of how to manage in business life. Ethics looks for the answer to the question of how to live. Because man is a person, his value brings consequences for all areas of human activity. This also applies to the market. The market is one of the foundations of economic life and is a great good for people and societies. The market is defined in different ways. It is worth comprehensively describing what the market is, emphasizing its personal character. In economics, attention is paid to market failure, understood mostly as the ineffectiveness of management (deviation from the model market, which is perfectly competitive). The negative impact of the market on society is also identified. Although moral aspects are increasingly taken into account in the concept of market failure, there is no general theory that attempts to capture market in moral aspects. Therefore, it is worth asking whether such a theory is possible. The construction of the moral theory of market failure can be a reference point to the analysis of market practices and institutional conditions from an ethical point of view.
Źródło:
Annales. Etyka w Życiu Gospodarczym; 2019, 22, 2; 25-39
1899-2226
2353-4869
Pojawia się w:
Annales. Etyka w Życiu Gospodarczym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applying the Anticipatory Failure Determination at a Very Early Stage of a System’s Development: Overview and Case Study
Autorzy:
Chybowski, L.
Gawdzińska, K.
Souchkov, V.
Powiązania:
https://bibliotekanauki.pl/articles/2065020.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
complex technical system
anticipatory failure determination
AFD
anticipatory failure analysis
AFA
failure prediction
Theory of Inventing Problem Solving
TRIZ
Opis:
Anticipatory Failure Determination (AFD) is a tool used in the TRIZ (Theory of Inventive Problem Solving) methodology. This article introduces its concept and describes the process of AFD in different versions of the method. The article presents the application of the AFD method at a very early state of a system’s development, i.e. its concept formulation stage, which corresponds to a technology readiness level (TRL) equal to 2. The system under analysis is a set of devices used to reduce displacement ship hull resistance. The system was modelled using functional analysis. An analysis of system resources was then carried out. Possible direct, indirect, and accident-related failures were identified. A multi-criteria analysis of the causes of system failures was conducted from which the top 10 potential failures were selected. Observations were made on the applicability of AFD in respect to systems not yet implemented.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 205--215
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wybrane aspekty kosztów oraz awaryjności przewodów przykładowego systemu wodociągowego
Selected Issues of Costs and Failure of Pipes in an Exemplary Water Supply System
Autorzy:
Pietrucha-Urbanik, K.
Studziński, A.
Powiązania:
https://bibliotekanauki.pl/articles/1817993.pdf
Data publikacji:
2016
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
sieć wodociągowa
awaryjność
koszty
intensywność uszkodzeń
water network
failure
cost
failure rate
Opis:
The aim of the study is to analyze cost and failures of water pipes. The analysis was conducted on the basis of operational data of the failure of the water supply network pipes, obtained from the water supply company. In the analysis, the indicator of failure rate for different types of water pipes (mains, distributional pipes and water supply connections) was accounted for. The analysis of the failure of water supply pipes in connection to the diameter, age and material was presented in the paper. The analysis can be applied in operational practice in water companies, particularly in the analysis related to the costs of pipe repairs, which consists in estimating the cost of repair work. Material composition of water supply system constitutes mainly PE and steel pipes. The new pipes are built mainly of PE. The regular replacement of cast iron pipes is noted, because of their high failure rate, which indicates that these pipes have reached the end of life technology. The obtained failure rate values were referred to the ones recommended by European criteria, as it should not exceed 0,3 failure/km a for mains, 0,5 failure/km a for distributional pipes and 1,0 failure/km a for water supply connections. In the case of distributional pipes, the failure rate exceeds the criteria and in the case of water supply connections and distributional pipes, the observed values are lower than the limit value. Repair of mains constitute 39% of all costs due to the large diameter pipes and the associated higher cost of the material. Lower total cost is related to failures, which occur on distributional pipes (23.8%) and fittings of water supply network (3.7%). The total cost of operating employees constitutes the highest of all costs. The costs incurred for materials are lower of 9.2%. Labour costs are higher than the costs of equipment by 3.6%. The data can be complementary to the national database in this area and allow to carry out a satisfactory assessment of the water supply network, taking into account both the network failure rate, as well as the tendency of changes in material supply network pipes. Despite numerous studies in the field of water supply system failure, there is still a need of conducting further study, such situation is affected by the ongoing changes in the age and structure of water supply networks. The collected data and conducted analysis can be one of the decisive indicators for the policy of operation of water supply systems.
Źródło:
Rocznik Ochrona Środowiska; 2016, Tom 18, cz. 2; 616-627
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Test Signal Design for Failure Detection: a Linear Programming Approach
Autorzy:
Scola, H. R.
Nikoukhah, R.
Delebecque, F.
Powiązania:
https://bibliotekanauki.pl/articles/908093.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
automatyka
failure detection
large scale programming
failure isolation
bounded perturbations
active detection
Opis:
A new methodology for the design of filters that permits failure detection and isolation of dynamic systems is presented. Assuming that the normal and the faulty behavior of a process can be modeled by two linear systems subject to inequality bounded perturbations, a method for the on-line implementation of a test signal, guaranteeing failure detection, is proposed. To improve the fault detectability of the dynamic process, appropriate test signals are injected into the system. All the computations required by the proposed method are implemented as the solution of large sparse linear optimization problems. A simple numerical example is given to illustrate the proposed procedure.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2003, 13, 4; 515-526
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Awaryjność ścianowych kombajnów węglowych na przykładzie KSW-475-/BP i KSW-460/NZ
Failure frequency of the longwall coal shearers machine with regard to KSW-475/2BP and KSW-460/NZ
Autorzy:
Profaska, M.
Bielak, M.
Powiązania:
https://bibliotekanauki.pl/articles/113524.pdf
Data publikacji:
2016
Wydawca:
STE GROUP
Tematy:
kombajn ścianowy
identyfikacja uszkodzeń
diagnozowanie uszkodzeń
longwall coal shearer
failure detection
failure diagnosis
Opis:
W publikacji przedstawiono uszkodzenia ścianowych kombajnów węglowych KSW 475/2BP oraz KSW-460/NZ pracujących w porównywalnych warunkach górniczo-geologicznych. Podjęto problematykę związaną z uszkodzeniami mechanicznymi oraz awariami układu hydraulicznego, najciekawsze z nich zostały przeanalizowane szczegółowo. Analizie poddane zostaną również sposoby diagnozowania, usuwania oraz przyczyny powstawania awarii.
This article presents damages of longwall coal shearers: KSW 475/2BP and KSW-460/NZ working in comparable geological and mining conditions. The following paper reports issue of mechanical failures and hydraulic system problems, the most interesting of them were elaborated. What was also analyzed were methods of diagnosing and troubleshooting and the causes of failures.
Źródło:
Systemy Wspomagania w Inżynierii Produkcji; 2016, 2 (14); 278-286
2391-9361
Pojawia się w:
Systemy Wspomagania w Inżynierii Produkcji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Device Failure in the Mechanical Production Plant
Autorzy:
Sitko, J.
Mikuš, R.
Božek, P.
Powiązania:
https://bibliotekanauki.pl/articles/2064943.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
plant
failure
analysis
repair
quality
Opis:
The article evaluates the failure rate of devices in the Mechanical Processing Plant using a traditional quality tool, the Pareto-Lorenzo diagram. A comparative analysis of failure rates was performed, recorded in repair, inspection and maintenance card. Then, changes were proposed in order to reduce failure rates and earlier detection of equipment malfunctions. In order to analyze the failure rate of grain washer equipment during thick coal preparation process, one quality management tools was used - the Pareto-Lorenzo diagram. In this case, it is important to assess the mechanical failure of devices, and demonstrating which devices generate most repairs. Based on materials made available by the mine, such as: Repair, inspection and maintenance cards, Device cards, DTR documentation. Quantitative and qualitative assessment the most frequently occurring mechanical failures during operation of devices in process enrichment of coarse sizes was carried out. An attempt was made to assess failure rate of devices on a grain washer. A comparative analysis of failure rates in 2015-2017 recorded in the repair, inspection and maintenance card was carried out. Then, changes were proposed to stand, in order reduce failure rates, and earlier detection equipment malfunctions.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 93--99
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of the FMEA method in the analysis and assessment of technical systems safety
Autorzy:
Tchórzewska-Cieślak, B.
Pietrucha-Urbanik, K.
Szpak, D.
Powiązania:
https://bibliotekanauki.pl/articles/2068740.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
FMEA
risk
safety
failure analysis
Opis:
The analysis and assessment of the protection of technical system was performed using the FMEA method (Failure Mode and Effect Analysis). The FMEA method allows the product or process to be analysed, to identify weak points, and then introduce corrections and new solutions to eliminate sources of undesirable events. The developed methodology was presented on the example.
Źródło:
Journal of Polish Safety and Reliability Association; 2018, 9, 3; 95--100
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Percepcja ryzyka niepowodzenia zawodowego wśród studentów
Perception the Risk of Professional Failure Among Students
Autorzy:
Wódz, Jacek
Szczepańska-Woszczyna, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/920307.pdf
Data publikacji:
2018-12-15
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
luck
failure
student
occupation job
Opis:
The author reflects on the risk of professional failure among students. He believes that in this case we have a vague definition of professional failure. He indicates both causes, those independent of humans and those related to their own actions or negligence. Then he refers to the category of occupation and its place in times of uncertainty. Pointing to the factors determining the perception of the risk of professional failure, he emphasizes the role of the University, which gives support to its students in the process of their professional risk assessment.
Źródło:
Studia Edukacyjne; 2018, 51; 287-308
1233-6688
Pojawia się w:
Studia Edukacyjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Significance of education and self-management support for patients with chronic heart failure in family physician practice
Autorzy:
Korzh, Oleksii
Krasnokutskiy, Sergiy
Powiązania:
https://bibliotekanauki.pl/articles/551603.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
education
heart failure
self-management.
Źródło:
Family Medicine & Primary Care Review; 2016, 4; 432-436
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of semiautonomy mode for ibis mobile robot with analysis of sensor failure tolerance
Autorzy:
Bartoszek, J.
Trojnacki, M.
Bigaj, P.
Powiązania:
https://bibliotekanauki.pl/articles/384614.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
sensor failure
mobile robot
semiautonomy
Opis:
This work is concerned on sensitivity analysis of semiautonomy algorithm of mobile combat robot to environmental sensors' damage. The construction of the robot, semiautonomy algorithm and used sensors have been described. This algorithm takes into account environmental sensors’ damage. Simulation research results of semiautonomy algorithm using Matlab/Simulink package was presented. This research was performed for normal environmental sensors’ operation and for selected sensors' damage. On that basis, sensitivity of semiautonomy algorithm to selected environmental sensors damage was tested.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2011, 5, 4; 3-10
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of costs of repairs of undesirable events occurring in a municipal bus transportation system
Autorzy:
Bojar, P.
Woropay, M.
Migawa, K.
Szubartowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/247304.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
transport system
collision
devastation
failure
Opis:
Systems of public transport carry out their tasks on the territory of a given town and in the suburbs performing the same functions as in towns. A distinctive feature of this type of system is performance of its task for twenty four hours, in different traffic intensity conditions over an assigned administrative area. This type of variables has a large influence on occurrence of undesirable events (failure of vehicles and their devastation, collision and accidents). In the work, an attempt of identification of undesirable events occurring in the analyzed transport system has been made. Moreover, an analysis has been made which covers one day of the week, time of the day and weather conditions in which particular events took place. Another aspect of the work was to make an analysis of the vehicle driver's age, job experience and a given hour of work on the day of the event occurrence. Obtainment of such data allowed demonstrating the structure of events according to the criterion of the event type, and costs connected with bringing the damaged transport means to the state of serviceability. The obtained results of experimental tests provide a basis for taking rational decisions by decision makers employed in a given system. These decisions are supposed to reduce the number of undesirable events occurrence and costs connected with them.
Źródło:
Journal of KONES; 2011, 18, 4; 19-24
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expression profile of circulating microRNAs in patients with ischemic heart failure with moderately reduced left ventricular ejection fraction – pilot study
Autorzy:
Kaufmann, Damian
Daniłowicz-Szymanowicz, Ludmiła
Sakowicz-Burkiewicz, Monika
Szwoch, Małgorzata
Pawełczyk, Tadeusz
Raczak, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/895765.pdf
Data publikacji:
2019-02-05
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
heart failure
circulating microRNAs
biomarkers
Opis:
Introduction: Heart failure (HF) is a growing global pandemic that affects millions of people around the world. Despite the progress in medicine, diagnosis and treatment of HF remains problematic. Recently, noncoding micro ribonucleic acids called miRNAs have become significant in the diagnosis and stratification of HF risk. Aim: The aim of this study was the attempt to identify the profile of circulating miRNAs specific for ischemic HF with moderately reduced left ventricular ejection fraction (HFmrEF). Methods and Results: A number of changes in the miRNA profile can characterise patients with ischemic HFmrEF. This is a pilot study before further research on a larger group of patients. Conclusions: Using the quantitative reverse transcription-polymerase chain reaction (qRT-PCR), serum levels of 84 miRNA were measured and compared between a patient with ischemic HFmrEF and a healthy volunteer. Analysis reveals a down-regulation of let-7f-5p and miR-1-3p, as well as up-regulation of miR-100-5p, miR-10b-5p, miR-125a-5p, miR-140-5p, miR-144-3p, miR-149-5p, miR-15b-5p, miR-183-5p, miR-208b-3p, miR-224-5p, miR-26b-5p, miR-27b-3p, miR-302a-3p, miR-320a, miR-7-5p, miR-99a-5p.
Źródło:
European Journal of Translational and Clinical Medicine; 2018, 1, 2; 53-57
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prolonged renal failure in the course of atypical ethylene glycol intoxication
Autorzy:
Liberek, Tomasz
Śliwarska, Julita
Czurak, Krzysztof
Perkowska-Ptasińska, Agnieszka
Weber, Ewa
Rutkowski, Bolesław
Powiązania:
https://bibliotekanauki.pl/articles/1039462.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
ethylene glycol
intoxication
renal failure
Opis:
Ethylene glycol poisoning is not an uncommon cause of an acute renal injury. In this paper we present case of prolonged renal failure in the course of ethylene glycol intoxication. Due to the low dose of ingested ethylene glycol and concomitant ethanol consumption, the neurodepressive phase of the intoxication was rather mild and patient presented to the hospital on the ninth day after poisoning with established renal failure. The diagnosis of the specific cause of renal injury was facilitated by the renal biopsy.
Źródło:
Acta Biochimica Polonica; 2013, 60, 4; 661-663
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of selected strain-based failure criteria on ship structure damage resulting from a collision with an offshore wind turbine monopile
Autorzy:
Niklas, Karol
Bera, Alicja
Powiązania:
https://bibliotekanauki.pl/articles/2033234.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship
collision
monopile
failure
crashworthiness
Opis:
Offshore wind farms are developing well all over the world, providing green energy from renewable sources. The evaluation of possible consequences of a collision involves Finite Element computer simulations. The goal of this paper was to analyse the influence of selected strain-based failure criteria on ship damage resulting from a collision with an offshore wind turbine monopile. The case of a collision between an offshore supply vessel and a monopile-type support structure was examined. The results imply that simulation assumptions, especially the failure criteria, are very important. It was found that, using the strain failure criteria according to the minimum values required by the design rules, can lead to an underestimation of the ship damage by as much as 6 times, for the length of the hull plate, and 9 times, for the area of the ship hull opening. Instead, the adjusted formula should be used, taking into account both the FE element size and the shell thickness. The influence of the non-linear representation of the stress-strain curve was also pointed out. Moreover, a significant influence of the selected steel grade on collision damages was found.
Źródło:
Polish Maritime Research; 2021, 4; 42-52
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A topological model to assess networks connectivity and reliability
Autorzy:
Eid, M.
Hami-EL, A.
Souza de Cursi, E.
Powiązania:
https://bibliotekanauki.pl/articles/2069197.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
network
connectivity
failure
reliability
availability
Opis:
The acceleration of the interconnectivity of networks of all sorts brings to the front scene the issue of networks performance measure. Recently, one observed an accelerating course towards quantitative probabilistic models to describe and assess networks’ Connectivity, as being the main vector of performance. However, modelling realistic networks is still far from being satisfactorily achieved using quantitative probabilistic models. On the other hand, little room had been lift to exploring the potential of topological models to develop qualitative and semi- quantitative models in order to assess networks connectivity. In this paper, we are exploring the potential of the topological modelling. The proposed model is based on describing the nodepair connectivity using binary scalars of different orders (tensors). Preliminary results of our explorations sounded very promoting.
Źródło:
Journal of Polish Safety and Reliability Association; 2013, 4, 2; 167--178
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods for identifying threats of critical infrastructure systems within Baltic Sea region
Autorzy:
Tchórzewska-Cieślak, Barbara
Pietrucha-Urbanik, Katarzyna
Szpak, Dawid
Powiązania:
https://bibliotekanauki.pl/articles/2068699.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
failure
system safety
safety management
risk
security
threats
FMEA
safety
failure analysis
Bayes network
Opis:
In the analysis of the operation of critical infrastructure systems it is important to perform the analysis of the safety of the operation. The daily operation of such systems is inherently associated with the occurrence of various types of random undesirable events. Therefore, in the paper the matrix and logical trees methods used in the analysis of the risk of threats in critical infrastructure systems within the Baltic Sea, were presented. The analysis and assessment of the protection of technical system was performed using the FMEA method (Failure Mode and Effect Analysis). As to analyse the cause and effect of undesirable events the method of Bayes' theorem and Java Bayes program were implemented, which allows to identify the probability of the event occurrence.
Źródło:
Journal of Polish Safety and Reliability Association; 2019, 10, 1; 149--166
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Łożyskowanie wałów przekładni turbin wiatrowych – problemy eksploatacyjne
Bearing systems of wind turbines – maintenance problems
Autorzy:
Wasilczuk, M.
Gawarkiewicz, R.
Libera, M.
Wasilczuk, F.
Kinal, G.
Powiązania:
https://bibliotekanauki.pl/articles/189693.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
turbina wiatrowa
uszkodzenia przekładni
uszkodzenia łożysk
wind turbine
roller element bearing failure
gear failure
Opis:
W praktyce eksploatacyjnej turbin wiatrowych o tradycyjnej konstrukcji (przekładniowych) obserwowana jest duża awaryjność przekładni, a zwłaszcza łożysk tocznych szybkoobrotowych wałów przekładni. W Polsce na zlecenie właściciela dużej farmy wiatrowej, firmy Energa Wytwarzanie S.A., Politechnika Gdańska we współpracy z Politechniką Poznańską i Akademią Górniczo-Hutniczą podjęły badania mające na celu diagnozowanie przyczyn uszkodzeń oraz sformułowanie zaleceń obniżających koszty eksploatacji. W pracy przedstawione są pierwsze ustalenia wynikające z analizy istniejących danych z eksploatacji turbin wiatrowych o mocy 1,5 MW.
In operation of wind turbines of conventional design (with gear), a high failure rate of gears, especially the cylindrical roller bearings of the high-speed shafts, are observed. In Poland, the owner of a large wind farm Energa Wytwarzanie S.A. initiated a research program aimed at diagnosing the roots of failures and propose recommendations to lower operating costs, In the paper, the first findings from the analysis of existing data from the operation of wind turbines of 1.5 MW carried out by Gdańsk University of Technology in cooperation with Poznań University of Technology and AGH University of Science and Technology are presented.
Źródło:
Tribologia; 2015, 4; 187-198
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Awaria budynku zabytkowego w wyniku realizacji prac budowlanych w sąsiedztwie
The failure of the listed building as result of the realization of construction work in the neighbourhood
Autorzy:
Błaszczyński, T.
Powiązania:
https://bibliotekanauki.pl/articles/390099.pdf
Data publikacji:
2016
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
budynek zabytkowy
awaria
stan awaryjny
prace budowlane
listed building
failure
failure state
construction work
Opis:
W związku z projektowaną budową wielofunkcyjnego budynku biurowo-usługowego w Poznaniu, a także w związku z przewidywaną modernizacją technicznej infrastruktury podziemnej, powinna zachodzić potrzeba inwentaryzacji i oceny stanu technicznego istniejących obiektów sąsiednich. Także zgodnie z wymogami sformułowanymi w decyzji o warunkach zabudowy oraz zgodnie z uwagami zawartymi we wcześniejszych ekspertyzach, powinno się wykonać te prace. Inwentaryzacja i ocena stanu technicznego istniejących obiektów sąsiednich powinna być wykonana pod kątem wpływu budowy na nie i przeciwdziałania ewentualnym skutkom związanym z realizacją projektowanych robót w sąsiedztwie. Niestety inwestor takich prac nie podjął, a realizowane prace doprowadziły do stanu awaryjnego w analizowanym budynku zabytkowym.
In connection with new designed construction of retail-office building in Poznań, and also in connection with the foreseen modernization of the technical underground infrastructure, it should happened the necessity of inventory and the estimation of the technical state of existing neighbouring objects. Also formally with formulated in the decision land development and in accordance with the references contained in earlier expertises, these works should be execute. The inventory and the estimation of the technical state of existing neighbouring objects should be performed in the connection with the influence of new construction in the vicinity on these objects and with counteractions to possible results connected with the realization of designed works in the neighbourhood. Unfortunately the investor did not undertake such works, and realized works brought to the failure state in analysed listed building.
Źródło:
Budownictwo i Architektura; 2016, 15, 2; 79-86
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interval-valued intuitionistic fuzzy failure modes and effect analysis of the system failure risk estimation
Autorzy:
Nguyen, H.
Powiązania:
https://bibliotekanauki.pl/articles/243789.pdf
Data publikacji:
2017
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
interval-valued intuitionistic fuzzy sets
failure modes
effects analysis
system failure risk estimation
expert judgment
Opis:
Among the risk assessment methods, failure modes and effects analysis (FMEA) is a popular, widely used engineering technique in many areas. It can be used to identify and eliminate known or potential failure modes to enhance reliability and safety of complex systems. In practice, risk estimations encounter difficulties connected with shortage of data. In such cases, we have to rely on subjective estimations made by persons with practical knowledge in the field of interest, i.e. experts. However, in some realistic situations, the decision makers might be unable to assign the exact values to the evaluation judgments due to his/her limited knowledge. In other words, there is a certain degree of hesitancy in human cognition and his/her judgment, who may have insufficient knowledge of the problem domain or uncertainty in assigning the evaluation values to the objects considered. In order to deal with ambiguity and uncertainty in the imperfect information, there have been recently proposed many various such theories as fuzzy sets, interval-valued fuzzy sets, type-2 fuzzy sets, hesitant sets, grey sets, rough sets and intuitionistic fuzzy sets. They have drawn more and more attention of scholars and been adopted in many applications This article addresses the Atanassov’s interval-valued intuitionistic fuzzy sets and FMEA methods in the risk estimation of the system failures based on the expert judgments.
Źródło:
Journal of KONES; 2017, 24, 2; 159-166
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza kosztów materiałów użytych do usuwania awarii przewodów wodociągowych
Analysis of Material Costs Used for Failure Removal of Water Supply Networks
Autorzy:
Studziński, A.
Pietrucha-Urbanik, K.
Powiązania:
https://bibliotekanauki.pl/articles/1813737.pdf
Data publikacji:
2018
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
sieć wodociągowa
awaryjność
koszty usuwania awarii
materiały
water network
failure
cost of failure removal
materials
Opis:
Koszty usuwania awarii przewodów można rozdzielić na koszty materiałów, sprzętu oraz robocizny. Opracowanie dotyczy analizy kosztów materiałów związanych z usuwaniem awarii rurociągów wodociągowych. Podstawą pracy są dane eksploatacyjne zebrane podczas usuwania 302 awarii przewodów w mieście o liczbie mieszkańców przekraczającej 100 tys. Zauważono zależność kosztów materiałów od średnicy oraz materiału przewodu, które rosną wraz ze wzrostem średnicy. Zróżnicowanie kosztów jest również wynikiem lokalizacji przewodu – tam gdzie wymagany jest wysoki stopień zagęszczenia gruntu przeprowadza się jego wymianę, co skutkuje wzrostem kosztów materiałów, przewody prowadzone w pasie drogowym charakteryzuje więc wyższy koszt materiałów. W badanym systemie zaopatrzenia w wodę średni koszt materiałów użytych do naprawy awarii wyniósł 517 zł (poziom cen 2015 rok), był niższy od kosztów robocizny, które wyniosły 800 zł. W 47% awarii konieczne było zastosowanie kruszyw, co przeciętnie podniosło koszt materiałów w tym przypadku o 320 zł.
Costs of pipe failure removal cables can be separated into the cost of materials, equipment and labor. The paper concerns the analysis of material costs associated with failure removal of water supply pipelines. The basis of the work constitutes operational data collected during the removal of 302 failures on pipes in city with a population exceeding 100 thousand. The dependence of material costs and the pipe diameter, which grow with increasing diameter, is noted. Cost diversification is also the result of the location of the pipe – where a high degree of soil compaction is required, the exchange is performed, resulting in material costs increase, so the pipes in the lane are characterized by higher material costs. In the analyzed water supply system average cost of materials used to repair the failure amounted to 517 zł (price level for 2015 years) and was lower than labor costs, which amounted to 800 zł. In 47% of the failure it was necessary to use aggregates, which on average increased the cost of materials in this case by 320 zł.
Źródło:
Rocznik Ochrona Środowiska; 2018, Tom 20, cz. 2; 1453-1464
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Directional change and windup phenomena in LQR-controlled systems with actuator failure
Autorzy:
Horla, D.
Powiązania:
https://bibliotekanauki.pl/articles/141455.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
directional change
windup phenomenon
actuator failure
Opis:
The paper presents a phenomenon of directional change in the case of a LQR controller applied to multivariable plants with amplitude and rate constraints imposed on the control vector, as well as the impact of the latter on control performance, with the indirect observation of the windup phenomenon effect via frequency of consecutive resaturations. The interplay of directional change of the computed control vector with control performance has been thoroughly investigated, and it is a result of the presence of constraints imposed on the applied control vector for different ratios of the number of control inputs to plant outputs. The impact of the directional change phenomenon on the control performance (and also on the windup phenomenon) has been defined, stating that performance deterioration is not tightly coupled with preservation of direction of the computed control vector. This conjecture has been supported by numerous simulation results for different types of plants with different LQR controller parameters.
Źródło:
Archives of Electrical Engineering; 2018, 67, 2; 345--359
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The airway obstruction - important abrupt condition for pediatrics
Autorzy:
Tomaszewski, M.
Banakiewicz, K.
Jajko, K.
Szypowski, R.
Zieliński, P.
Zalewski, G.
Spisacka, S.
Olchowik, G.
Powiązania:
https://bibliotekanauki.pl/articles/2052449.pdf
Data publikacji:
2015
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
airway obstruction
hypoxemia
hypercapnia
respiratory failure
Opis:
The ability of fast response in case of increasing health problems of a child which lead directly to life-threatening situations is a necessary condition for creating opportunity of child’s survival until it will be transported to intensive care unit, where it will be provided with care by a specialist. In case of healthy children the most common cause of acute respiratory failure is obstruction of upper respiratory tract. There is an enormous variety of causes of upper airway obstruction, but the most important are the result of congenital defects, acute inflammation, anaphylactic reactions, foreign body aspiration and injuries. Consequence of the hypoventilation resulting from significant impediment of airflow through the obstructed airways is impaired gas exchange in the lungs. This leads to the increasing hypoxemia (PaO 2 <60 mmHg) and hypercapnia (PaCO2> 45 mmHg). This condition is called the total respiratory failure. The persistence of hypoventilation leads to hypoxia of vital organs (heart muscle, brain), increased anaerobic metabolism, acidosis, and inevitably to cardiac arrest as a result of homeostasis disorders. Respiratory failure is defined as acute when developing suddenly and is potentially reversible. We can find such a situation in the fast-increasing stenosis of the larynx. Symptoms of severe dyspnoea occur in a short time, but can be interrupted by an effective airway patency. Acute respiratory failure is a state of direct threat to life, which is why it is crucial to give a prompt aid to the sick child. The aim of this paper is to discuss the signs and symptoms, knowledge of which is essential for rapid identification and initial differentiation of the causes of acute upper airway obstruction in children. The principles of first-aid for children with acute respiratory failure and above all the description of life-saving procedures will be presented.
Źródło:
Health Problems of Civilization; 2015, 09, 1; 18-22
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intrauterine fetal demise and late motherhood - a case report
Autorzy:
Kiersnowska, I.
Baranowska, B.
Bączek, G.
Węgrzyn, P.
Powiązania:
https://bibliotekanauki.pl/articles/2088266.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Opolski. Instytut Nauk o Zdrowiu
Tematy:
fetal death
late motherhood
obstetric failure
Opis:
Background: Intrauterine fetal death is a potential risk in each stage of pregnancy, regardless of the mother’s age. In Poland in 2015, new standards of care were introduced for women with obstetric failure. Aim of the study: This study aimed to analyze intrauterine fetal demise in the context of late motherhood. Material and methods: Medical documentation and a semi-structured interview were used. Case report: A 41-year old primipara in 37 weeks of pregnancy, who had not felt fetal movements for 2 days, was diagnosed with intrauterine fetal demise. The pregnancy was uneventful before, but the patient suffered from hypertension and severe obesity. As a result of induced labor, a male neonate weighing 2260 g, 49 cm long, with no signs of vital functions, was born. After the birth, it was established that the child died due to an umbilical cord accident. The mother was given the appropriate time to see the child for the last time. During delivery and hospitalization, the patient’s privacy was ensured, she was isolated from other women in labor and new mothers and was assisted by her family. During the hospital stay, the patient was under the care of the obstetrician, midwife and clinical psychologist. She was discharged from the hospital after 6 days. Conclusions: The loss of a child is one of the most traumatic experiences for a mother, particularly in the case of older mothers. A woman’s fertility declines with age, so getting pregnant again might prove extremely difficult for older women.
Źródło:
Medical Science Pulse; 2019, 13, 3; 35-38
2544-1558
2544-1620
Pojawia się w:
Medical Science Pulse
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of liquefaction potential for loose minefill slopes
Autorzy:
Kudella, P.
Powiązania:
https://bibliotekanauki.pl/articles/1954561.pdf
Data publikacji:
2022-02-07
Wydawca:
Politechnika Gdańska
Tematy:
liquefaction
granular materials
hypoplasticity
instability
failure
Opis:
Uncompacted embankments of certain fine sands exhibit a spontaneous liquefaction potential, which cannot be evaluated basing on undrained shear strength alone. A novel procedure for stability analysis has been developed, basing on Hill's stability criterion and a hypoplastic constitutive law. With given relative densities, assumed initial stress states and variations of perturbation directions, stability or instability of slope sections can be assessed. Catastrophic landslides observed in the past could thus be explained.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 3; 439-451
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of methods for identifying threats including the critical infrastructure systems within the Baltic Sea
Autorzy:
Tchórzewska-Cieślak, B.
Pietrucha-Urbanik, K.
Szpak, D.
Powiązania:
https://bibliotekanauki.pl/articles/2068908.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
failure
system safety
safety management
threats
Opis:
In the analysis of the operation of critical infrastructure systems it is important to perform the analysis of the safety of the operation. The daily operation of such systems is inherently associated with the occurrence of various types of random undesirable events. Therefore, in the paper the methods used in the analysis of the risk of threats in critical infrastructure systems within the Baltic Sea, were presented.
Źródło:
Journal of Polish Safety and Reliability Association; 2017, 8, 1; 139--148
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Developing procedures for hazard identification
Autorzy:
Tchórzewska-Cieślak, B.
Pietrucha-Urbanik, K.
Szpak, D.
Powiązania:
https://bibliotekanauki.pl/articles/2069083.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
failure
system safety
safety management
threats
Opis:
The reliable operation of critical infrastructure has a direct impact on the energy security of country. Due to the complexity and vastness of such system it is exposed to various types of events that could lead to failure. These risks may result directly from the operation and also be the result of external factors. Especially dangerous are the undesirable events with incidental character or unlikely events that constitute a serious threat to people and the environment and resulting in significant loss.
Źródło:
Journal of Polish Safety and Reliability Association; 2016, 7, 1; 209--216
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method of performing Design FMEA on electronic circuit diagrams
Autorzy:
Karcz, R.
Powiązania:
https://bibliotekanauki.pl/articles/2069239.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
electronic circuit analysis
failure mode
TTAA
Opis:
Existing method of performing FMEA for electronic diagrams is time consuming task. For complex systems analysis of every single component failure mode and its effect deeply involves design team and blocks resources availability for long time. Method presented in this paper allows effective analysis of design failure modes using FMEA approach carrying so called Time to Acceptable Analysis (TTAA) constraint.
Źródło:
Journal of Polish Safety and Reliability Association; 2015, 6, 1; 125--128
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On some approaches to the stress-state determination in layered cracked plates
Autorzy:
Delyavsky, M.
Opanasovich, V.
Olejniczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/279462.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
layered plates
crack
stress distribution
failure
Opis:
A survey of approaches to determination of the stress-state in layered plates with the cracks located symmetrically about their thickeness is presented. The plate is subject to a complex biaxial loading; i.e., tension - shear or bending - torsion, while the crack of length 2a is unloaded. The plate layers can be homogeneous or non-homogeneous, rigid to shear or yielding due to shear. To study such plates the following mathematical models are employed: the plates rigid to shear are considered within the framework of classical plate theory, while those yielding due to shear are within the scope of Timoshenko's theory. The asymptotic formulae for stress distribution near the crack tip in each layer of the plate are obtained; the limiting equilibrium of layered plate having a transverse crack is studied. The results presented can be applied to strength evaluation of layered plates within the framework of fracture mechanics. The paper presents the results obtained by the authors recently and proposes some generalisation.
Analiza stanu naprężeń w płytach warstwowych ze szczelinami W pracy przeprowadza się analizę stanu naprężeń w płytach warstwowych ze szczelinami poddanych dwuosiowemu rozciąganiu lub zginaniu stosując pewną metodę uśredniającą. Wykazuje się, że przy rozciąganiu można oprzeć się na klasycznej teorii płyt warstwowych, zaś w przypadku zginania zginania konieczne jest stosowanie teorii Timoshenki. Wyprowadzono asymptotyczne wzory rozkładu naprężeń w pobliżu wierzchołka szczeliny w każdej warstwie płyty. Wzory te zależą od modułów efektywnych płyty warstwowej oraz od uśrednionego współczynnika intensywności naprężeń. Przedstawiony model zawiera energetyczny test powiększania się szczeliny przy dwuosiowym rozciąganiu płyty.
Źródło:
Journal of Theoretical and Applied Mechanics; 2000, 38, 4; 819-832
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The failure analysis of the drilling rig hoisting steel wire rope
Autorzy:
Peterka, Pavel
Krešák, Jozef
Vojtko, Marek
Halek, Branislav
Heinz, David
Powiązania:
https://bibliotekanauki.pl/articles/1841928.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
wire rope
fatigue failure
cracks
NDT
Opis:
Drilling rigs belong to the lowest-safety level of hoisting rope systems. The valid regulation for drilling permits the usage of steel ropes on condition that their permanent safety does not decrease under the value 2.5. Considerable dynamic and cyclic stresses, abrasion and corrosive environment generated during the operation cause rapid fatigue and rope damage. The stress of the rope in operation leads to the specific precautions ensuring the safety rope work. The specific precautions include monitoring of the rope tractive work measured in tonne-kilometres (ton-kilometres services). The working part of the hoisting ropes of the drilling rigs - after the stated number of tonne kilometres was worked off - is slipped and a regular non-destructive rope test (NDT) is recommended. Rope under sizing, failing in rope slipping program and non- implementation of NDT controls led to the situations endangering the drilling crew safety. After the critical situations the operator decided to perform the analysis of the condition of all ropes.
Źródło:
Eksploatacja i Niezawodność; 2020, 22, 4; 667-675
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mitral regurgitation and its modern treatments
Autorzy:
Pręgowski, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1916655.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mitral regurgitation
heart failure
percutaneus intervention
Opis:
Mitral regurgitation is the second most common valvular disease. The etiology is either primary or functional-secondary  to the left ventricle dysfunction in the course of coronary artery disease, arterial hypertension and diabetes. Along with the population aging and increasing number of comorbidities the number of patients with mitral regurgitation soars. In patients with heart failure the mitral regurgitation significantly decreases the quality of life and worsens the survival prognosis. Surgical correction is the treatment of choice in patients with mitral regurgitation. However, up to 50% of potential candidates are denied surgery for its prohibitive risk. The minimally invasive, percutaneus procedures are potential solution for those subjects. Currently the „edge to edge” technique with use of the MitraClip system is most commonly performed. This procedure is less efficient in MR reduction than open heart surgery. However, the number of periprocedural complications is smaller. It has been shown the MR correction with the MitraClip device improves the duration and quality of life. There are several ongoing preclinical studies on the percutaneusly implanted mitral valve prosthesis. First in men procedures have been performed. However the mitral valve anatomy is much more complex as compared to aortic. Therefore the breakthrough comparable to TAVI procedure will not occur in the very close future.
Źródło:
Nauka; 2020, 3
1231-8515
Pojawia się w:
Nauka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability Design of Complex Systems by Minimizing the Lifetime Variance
Autorzy:
Łobos, E.
Momot, M.
Powiązania:
https://bibliotekanauki.pl/articles/908509.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
matematyka
reliability
constant failure rate
redundancy
Opis:
The problem considered in this paper is the minimization of the lifetime variance of a complex system subject to its expected life and economic constraints. The example of a bridge network, in which all elements have constant failure rates, illustrates the problem. A numerical algorithm for solving this optimization problem by using exact formulae for system lifetime moments is included. Using this algorithm, we can obtain results better than the solutions known from earlier papers.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2002, 12, 4; 553-557
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czynniki wpływające na niezawodność pracy sieci dystrybucyjnych
Factors influencing the reliability of distribution grids
Autorzy:
Wnukowska, Bogumiła
Powiązania:
https://bibliotekanauki.pl/articles/34105735.pdf
Data publikacji:
2023-09-30
Wydawca:
Collegium Witelona Uczelnia Państwowa
Tematy:
niezawodność
energia
awaria
reliability
energy
failure
Opis:
Jednym z najważniejszych zagadnień związanych z niezawodnością zasilania odbiorców jest sprawne funkcjonowanie sieci dystrybucyjnej. W pracy omówiono najważniejsze elementy elektroenergetycznej sieci dystrybucyjnej średniego napięcia. Przedstawiono przypadki awarii oraz ich wpływ na odbiorców energii elektrycznej oraz powstałe skutki. Praca zawiera analizę przyczyn powodujących awarie sieci dystrybucyjnej, dokonaną na podstawie dostępnych materiałów źródłowych oraz oddziaływanie awarii na odbiorców energii elektrycznej, a także na bezpieczeństwo energetyczne kraju.
One of the main problems connected with energy supply reliability is the efficient functioning of distribution grids. This paper discusses major elements of a medium voltage electric grid. It also presents cases of its failure as well as their outcomes and influence on energy consumers. This paper contains an analysis of the causes of distribution grid failure based on the available source materials and its consequences consumers as well as energy security of countries.
Źródło:
Zeszyty Naukowe Collegium Witelona; 2023, 3, 48; 11-26
2956-302X
2956-3208
Pojawia się w:
Zeszyty Naukowe Collegium Witelona
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the gas network failure and failure prediction using the Monte Carlo simulation method
Analiza awaryjności sieci gazowych oraz prognozowanie awarii z zastosowaniem symulacyjnej metody Monte Carlo
Autorzy:
Tchórzewska-Cieślak, B.
Pietrucha-Urbanik, K.
Urbanik, M.
Powiązania:
https://bibliotekanauki.pl/articles/301501.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
failure of gas network
Monte Carlo method
analysis of the failure structure
failure prediction
awaryjność sieci gazowej
metoda Monte Carlo
analiza struktury awaryjności
prognozowanie awaryjności
Opis:
The scope of the article includes the analysis of the gas network failure based on a material obtained from field tests covering the years 2004-2014, conducted on the gas network of 120 thousand city, allowing to specify the failure rate of the gas network with division into material, pressure and pipelines diameter and indicate the main causes of failure on gas networks. On the base of the results of this analysis the Monte Carlo method to predict failures in gas pipe network has been presented.
Artykuł swoim zakresem obejmuje analizę awaryjności sieci gazowej na podstawie uzyskanego materiału z badań eksploatacyjnych obejmujących lata 2004-2014 prowadzonych na terenie Zakładu Gazowniczego w 120 tys. mieście, co pozwoliło na podanie intensywności uszkodzeń sieci gazowych z podziałem na materiał, ciśnienie i średnice rurociągów oraz podanie głównych przyczyn powstawania awarii na sieciach gazowych. Na podstawie wyników analizy zaprezentowano zastosowanie metody Monte Carlo do prognozowania awarii sieci gazowych.
Źródło:
Eksploatacja i Niezawodność; 2016, 18, 2; 254-259
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Implementation of RCM theory in air operations
Autorzy:
Bugaj, M.
Powiązania:
https://bibliotekanauki.pl/articles/393850.pdf
Data publikacji:
2011
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
konserwacja
awarie
niezawodność
maintenance
reliability
failure
Opis:
Reliability-Centred Maintenance (RCM) implementation provides measures that signify progress towards implementing an RCM based maintenance program. Using numbers identified during the Analysis Phase as a basis, the metrics concentrate on the number and percentage of each category (new task, modified task, cancellation of specified old program tasks, design modifications, operational procedure changes, etc., that have actually been implemented. Implementation will (or should) usually begin during the Analysis Phase of an RCM project, and may provide information for improvement of the analysis. Implementation involves many activities, such as: Identification of resources (money, time, manpower), Coordination with governing authorities or other parties affected, Procedure writing, walk down and approval, Procurement of special tools, parts and consumables needed to carry out the procedures mandated under the new program, Training or at least orientation on the new procedures for those who are to perform them, Planning and scheduling of new RCM based procedures, Actual execution the first time on the asset that was subject of the RCM Project.
Źródło:
Archives of Transport System Telematics; 2011, 4, 1; 13-17
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of renal function on clinical and biochemical characteristics in advanced heart failure patients
Autorzy:
Bohdan, Michał
Frankiewicz, Anna
Gruchała, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/895727.pdf
Data publikacji:
2019-02-05
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
heart failure
kidney disease
exercise capacity
Opis:
Background: Coexistence of heart failure with reduced ejection fraction (HFrEF) and chronic kidney disease is associated with poor prognosis. We assessed the effect of renal function on exercise capacity and clinical parameters of patients with HF. Material and methods: Forty five patients aged 58.2 ± 10.6 years with stable severe HFrEF were recruited. Patients were divided into 3 groups: group 1 - eGFR: 30-59 ml/min/1.73 m2; group 2 - eGFR: 60-89 ml/min/1.73 m2 and group 3 - eGFR: ≥90 ml/min/1.73 m2. Biochemical analysis, echocardiography, 6-minute walking test and cardiopulmonary stress testing were performed. Results: Patients in group 1 were significantly older than patients in group 3 (60.4 ± 11.1 years vs. 49.25 ± 11.2 years, respectively, p<0.05). Patients in group 2 had significantly higher BMI in comparison to group 3 (29.8 ± 4.4 vs. 25.1 ± 4.2; p<0.05). Interestingly, patients in group 1 had significantly lower peak oxygen uptake (10.2 ± 3.1 ml/kg/min vs. 16.1 ± 3.5 ml/kg/min, p<0.05) and oxygen uptake at anaerobic treshold (7.9 ± 2.4 ml/kg/min vs. 10.7 ± 1.9 ml/kg/min, p<0.05). Conclusions: Diminished renal function in patients with stable, advanced HFrEF may be associated with significantly worse peak VO2 and VO2 in AT.
Źródło:
European Journal of Translational and Clinical Medicine; 2018, 1, 2; 17-22
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Risk factors for poor prognosis in heart failure with particular attention to the elderly population
Autorzy:
Dobrowolska, Małgorzata
Miękus, Paweł
Świątczak, Michał
Raczak, Grzegorz
Daniłowicz-Szymanowicz, Ludmiła
Powiązania:
https://bibliotekanauki.pl/articles/1891021.pdf
Data publikacji:
2021-12-02
Wydawca:
Gdański Uniwersytet Medyczny
Tematy:
heart failure
risk factors
prognosis
elderly
Opis:
Background: Heart failure (HF) is a leading cause of poor outcome. Age is considered one of the most critical risk factors for both the incidence and prognosis of HF. Therefore we aimed to assess the predictors of poor prognosis in HF patients with particular attention to the elderly population. Material and methods: We retrospectively enrolled patients hospitalized due to HF exacerbation during 2016-2017 (203 patients). The end-points were all-cause mortality and emergency rehospitalizations within a two-year follow-up period. A detailed analysis was performed in the subgroups of patients younger and older than 65 years old. Results: 121 (60%) patients experienced the end-points. Age, low systolic blood pressure, NYHA class IV, right ventricle HF symptoms, high C-reactive protein, troponin, NT-proBNP, hyponatremia, catecholamine therapy and mechanical ventilation during hospitalization independently predicted the end-points. The elderly were characterized by a higher incidence of concomitant diseases and HF with moderately reduced or preserved LVEF, worse laboratory parameters and pharmacological treatment, as well as worse prognosis. Conclusion: The prognosis of patients hospitalized due to HF, mainly the elderly, is poor. Simple clinical parameters could be useful in further decision-making regarding the intensification of their treatment.
Źródło:
European Journal of Translational and Clinical Medicine; 2021, 4, 2; 18-30
2657-3148
2657-3156
Pojawia się w:
European Journal of Translational and Clinical Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical and reliability aspects of failure in mechanical objects
Autorzy:
Młyńczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/2069670.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
physical degradation
mechanical object
reliability
failure
Opis:
Mechanical objects are operated in real world where degradation of material components and variability of processes managed by a man are the main factors influencing its efficiency. Machine degradation is a longlasting process concerning its material structure, components and connections. Loss of machine operations ability is due to failures caused by wear and tear, fatigue, corrosion, overloading, material ageing and many other destructive processes. It is observed close relation between failure modes and reliability models so that knowledge about failures may help analysts creating reliability models and determine the best operational decisions. In the paper it is discussed relation between physical phenomenon and theoretical models as a common platform of decision processes.
Źródło:
Journal of Polish Safety and Reliability Association; 2009, 2; 317--324
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cardiooncological balance in a 75-year-old male with a hepatocellular carcinoma CS IV and a congestive heart failure NYHA III „de novo”
Autorzy:
Żechowicz, Maciej
Wroński, Konrad
Rucińska, Monika
Powiązania:
https://bibliotekanauki.pl/articles/1065186.pdf
Data publikacji:
2015
Wydawca:
Medical Education
Tematy:
cardiooncology
heart failure
hepatocellular carcinoma (HCC)
Opis:
The case reports about a 75-years-old man without a previous medical history, in whom a heart failure NYHA III de novo was diagnosed together with persistent atrial fibrillation and hepatocellular carcinoma in clinical stage IV. Based on echocardiography and computed tomography there were pulmonary hypertension in course of lymphangiosis carcinomatosa as well as diffuse metastases in the abdomen diagnosed. Before the treatment initiation the patient was classified 3 in WHO performance status. After an improvement in control of the rhythm frequency and the heart failure treatment stabilisation with a β-blocker, an ACE-inhibitor, spironolactone and furosemide, the patient’s performance status improved to WHO 2. He was further disqualified from surgical procedures due to the advanced clinical stage of the oncological disease. Considering high probability of further cardiotoxic influence of sorafenib on the heart failure despite its satisfactory control, the patient was assigned to palliative chemotherapy with FOLFOX. Parallel he was strictly followed up cardiologically in an outpatient clinic what certainly supported the oncological treatment. The patient survived 32 weeks from the first hospitalization and the progression free survival was 12 weeks from the chemotherapy initiation.
Źródło:
OncoReview; 2015, 5, 2; A57-61
2450-6125
Pojawia się w:
OncoReview
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel logic-based approach for failure modes mitigation control and quantitative system reliability analyses
Oryginalna, oparta na logice metoda kontroli ograniczania przyczyn uszkodzeń i ilościowej analizy niezawodności systemu
Autorzy:
Yang, D.
Ren, Y.
Wang, Z.
Liu, L.
Sun, B.
Powiązania:
https://bibliotekanauki.pl/articles/301303.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
failure
reliability
failure mitigation control
quantitative reliability analyses
uszkodzenie
niezawodność
kontrola ograniczania uszkodzeń
ilościowe analizy niezawodności
Opis:
The core idea of reliability design is to mitigate the product’s failure modes. However, for the cross-links among potential failure modes of a complex product, it is very difficult to establish the mapping relationship between failure modes mitigation and quantitative values of reliability, and the decision of failure modes mitigation have to be performed by virtue of experience, which always increase design period. In order to solve these problems, a novel logic-based approach for failure modes mitigation control and quantitative system reliability analyses is provided. Firstly, a hybrid of active and passive control process of reliability design is proposed. Secondly, a novel concept of failure modes correlation set (FMCS) and a determination approach based on deductive theory are presented. According to the changes in failure modes probabilities of occurrence, the reliability formulas of the components and assemblies are provided to depict the effects of failure mode mitigation on reliability of components and assemblies. And then the FMCS mitigation sequence is decided to determine reliability design activities. Thirdly, a closed control process of FMCS mitigation is provided integrated with logic decision method. By exposing the design of a helicopter fuel system, the present study demonstrates that all approaches are feasible, and the relationship between reliability parameters and qualitative design exists. Hence the failure modes mitigation could be controlled for the achievement of quantitative reliability requirements.
Podstawowym problemem w procesie projektowania niezawodności jest ograniczenie przyczyn uszkodzeń produktu. Jednakże, w przypadku sieci połączeń pomiędzy możliwymi przyczynami uszkodzeń złożonego produktu, trudno jest ustalić mapę zależności pomiędzy ograniczaniem przyczyn uszkodzeń i ilościowymi wartościami niezawodności, a decyzje względem ograniczania przyczyn uszkodzeń muszą bazować na własnym doświadczeniu, co znacznie wydłuża okres projektowania. W celu rozwiązania powyższych problemów, zaproponowano oryginalną, opartą na logice, metodę kontroli ograniczania przyczyn uszkodzeń i ilościowej analizy niezawodności systemu. Na wstępie, zaproponowano mieszany proces aktywnej i pasywnej kontroli niezawodności projektu. Następnie, zaprezentowano oryginalną koncepcję zbioru korelacji przyczyn uszkodzeń (FMCS) i metodę oznaczania opartą o teorię dedukcji. Na podstawie zmian dotyczących prawdopodobieństwa występowania przyczyn uszkodzeń, określono wzory niezawodności części i układów w celu pokazania wpływu ograniczania przyczyn uszkodzeń na niezawodność części i układów. Określono następnie ograniczającą sekwencję FMCS, ażeby ustalić założenia dla projektowania niezawodności. Na koniec zaprezentowano zamknięty proces kontroli ograniczania FMCS w powiązaniu z logiczną metodą podejmowania decyzji. Analizując pod tym kątem projekt systemu paliwowego helikoptera, wykazano w niniejszej pracy przydatność wszystkich powyższych metod, jak również związek pomiędzy parametrami niezawodności a projektowaniem jakościowym. Dlatego też ograniczanie przyczyn uszkodzeń powinno być kontrolowane w celu osiągnięcia wymaganej niezawodności ilościowej.
Źródło:
Eksploatacja i Niezawodność; 2015, 17, 1; 100-106
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lost production costs of the overburden excavation system caused by rubber belt failure
Koszty utraconej produkcji wywołane uszkodzeniem gumowej taśmy transportowej w układzie maszynowym do zdejmowania nadkładu
Autorzy:
Bugaric, U.
Tanasijevic, M.
Polo Vina, D.
Ignjatovic, D.
Jovancic, P.
Powiązania:
https://bibliotekanauki.pl/articles/301919.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
koszty awarii
uszkodzenie taśmy gumowej
rozkład czasu uszkodzenia
malfunction costs
rubber belt failure
failure time distribution
Opis:
In this paper the average malfunction costs (lost production) of the overburden excavation system on the Tamnava - East field open-pit mine caused by the failure of belt conveyor rubber belts which work on the bucket wheel excavator, belt wagon and spreader are determined, i.e. the unit cost of system malfunction per hour of belt conveyor work during belt lifetime. The basis for the calculation of malfunction costs is presented by the proposed methodology for the analysis of rubber belt working time to failure based on the fact that working time until sudden failure (tear, breakthrough) can be described by exponential distribution while working time until gradual failure can be described by normal distribution. The proposed methodology as well as the expression for malfunction cost determination can be used, with appropriate adoptions, in the analysis of the functioning of other open-pit mines for better planning of malfunctions, requirements for spare rubber belts as well reductions in working costs, i.e. they can indicate better (optimal) maintenance strategy.
W prezentowanym artykule wyznaczono średnie koszty awarii (utraconej produkcji) układu maszynowego do zdejmowania nadkładu, wykorzystywanego w kopalni odkrywkowej Tamnava - East field, spowodowanej uszkodzeniem przenośnikowych taśm gumowych zastosowanych w koparce wielonaczyniowej, samobieżnym przenośniku taśmowym oraz zwałowarce. Koszt zdefiniowano jako jednostkowy koszt awarii układu na godzinę pracy przenośnika taśmowego podczas cyklu życia taśmy. Podstawę obliczeń kosztów awarii stanowiła zaproponowana metoda analizy czasu pracy taśmy gumowej do uszkodzenia, oparta na fakcie, iż czas pracy do nagłego uszkodzenia (rozerwanie, przebicie) można opisać za pomocą rozkładu wykładniczego, natomiast czas pracy do stopniowego uszkodzenia - za pomocą rozkładu normalnego. Proponowana metodologia, jak również równania do wyznaczania kosztów awarii mogą być wykorzystywane, przy odpowiedniej adaptacji, do analizy funkcjonowania innych kopalni odkrywkowych służąc lepszemu planowaniu awarii, zapotrzebowania na zapasowe pasy gumowe oraz redukcji kosztów pracy. Mogą one, innymi słowy, wskazywać (optymalną) strategię utrzymania ruchu.
Źródło:
Eksploatacja i Niezawodność; 2012, 14, 4; 333-341
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Images of Failure
Obrazki porażki
Autorzy:
Stańczyk, Xawery
Powiązania:
https://bibliotekanauki.pl/articles/28407481.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Slawistyki PAN
Tematy:
obraz
porażka
sztuka porażki
fotografia
glitch
brzydkie rzeczy
image
failure
art of failure
photography
ugly things
Opis:
On the one hand, the sphere of art offers the possibility to imagine a different, less oppressive and normative world, where just as in the case of cartoons even the greatest gawks, misfits, and outcasts would build friendships and alliances helping them to reach a happy ending. On the other hand, there is something of an artistic performance, at least of an illusionist show, to an intentional act of failure. To perform failure, one has to improvise, to operate randomly, blunderingly, and ostentatiously, as well as to resist the social norms and rules. The artworks that are presented here pertain to all of these meanings of the “art of failure”.
Sztuka jest z jednej strony sferą, w której można wyobrazić sobie inny, mniej opresyjny i normatywny świat; w nim – jak w kreskówkach – międzygatunkowe przyjaźnie i sojusze nawet największych gamoni, odmieńców i wyrzutków prowadzą do szczęśliwego zakończenia. Z drugiej strony w intencjonalnym uprawianiu porażki jest coś ze sztuki, a przynajmniej sztuczki prestidigitatora. Performowanie porażki wymaga zdolności improwizacji, podążania po omacku, dyletanctwa, fanfaronady oraz przeciwstawiania się społecznym normom i regułom. Prezentowane tu prace nawiązują do tych sensów „sztuki porażki”.
Źródło:
Studia Litteraria et Historica; 2020, 9; 1-21 (eng); 1-21 (pol)
2299-7571
Pojawia się w:
Studia Litteraria et Historica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the characterisation of X-Lindley distribution by truncated moments. Properties and application
Autorzy:
Metiri, Farouk
Zeghdoudi, Halim
Ezzebsa, Abdelali
Powiązania:
https://bibliotekanauki.pl/articles/2175833.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Lindley distribution
X-Lindley distribution
truncated moment
failure rate function
reversed failure rate function
characterisation of distributions
Opis:
Several papers introduce the new distributions and their applications, including, among others, those of Ducey and Gove [7], Grine and Zeghdoudi [8], Chouia et al. [5], Seghier et al. [11], Beghriche and Zeghdoudi [4], where characterisation of a probability distribution plays an important role in statistical science. Several researchers studied the characterisations of probability distributions. For example, Su and Huang [12] study the characterisations of distributions based on expectations. In addition, Nanda [10] studies the characterisations by average residual life and the failure rates of functions of absolutely continuous random variables. Ahmadi et al. [1] consider the estimation based on the left-truncated and right randomly censored data arising from a general family of distributions. On the other hand, Ahsanullah et al. [2, 3] present two characterisations of Lindley distribution, standard normal distribution, t-Student’s, exponentiated exponential, power function, Pareto, and Weibull distributions based on the relation of failure rate, reverse failure rate functions with left and right truncated moments. Recently, Haseeb and Yahia [9] studied truncated moments for two general classes of continuous distributions. In this paper, two characterisations of the X-Lindley distribution, introduced by Chouia and Zeghdoudi [5] have been studied. They are based on the failure, relation of the inverse failure rate functions with the left and right truncated moments, respectively. Section 2 gives some properties of X-Lindley distribution. Section 3 discusses the characterisation of general distribution by left truncated and failure rate function and then right truncated and reverse failure rate function. Section 4 studies the characterisation of X-Lindley distribution by using the relation between left/right truncated moment and failure/reverse failure rate function. Finally, an illustrative example of X-Lindley distribution with other one-parameter distributions is given to show the superiority and flexibility of this model.
Źródło:
Operations Research and Decisions; 2022, 32, 1; 99--109
2081-8858
2391-6060
Pojawia się w:
Operations Research and Decisions
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The determination procedure of the onset of the object wear-out period based on monitoring of the empirical failure intensity function
Procedura wyznaczania początku starzenia się obiektów na podstawie monitorowania empirycznej funkcji intensywności uszkodzeń
Autorzy:
Gill, A.
Kadziński, A.
Powiązania:
https://bibliotekanauki.pl/articles/1365958.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
failure intensity function
aging
nonrenewable objects
failure forecasting
funkcja intensywności uszkodzeń
starzenie
obiekty nieodnawiane
prognozowanie liczby uszkodzeń
Opis:
The estimation of the number of failures of technical objects is of key importance throughout the object life cycle, particularly in the wear-out period when the number of failures begins to grow significantly. In the literature related to this problem, examples exist of solutions (mathematical models) that can assist the estimation of the number of failures. For the description of the life cycles of objects, functions are usually used of known forms of probability distribution of the number of object failures. The procedure presented in this paper assumes the use of statistical data related to the failures of uniform population of nonrenewable technical objects, recorded in the form of empirical function of failure intensity. It specifically serves the purpose of determining the characteristic point of life of these objects i.e. the onset of the wear-out period. Within the procedure, a model of fuzzy inference has been applied that reflects the human reasoning (expert of the system) observing/investigating the objects. The results of the developed procedure may constitute a basis for forecasting of failures of mechanical nonrenewable technical objects.
Oszacowanie liczby uszkodzeń obiektów technicznych ma kluczowe znaczenie we wszystkich okresach cyklu życia obiektów, szczególnie w okresie uszkodzeń starzeniowych, kiedy to liczba uszkodzeń zaczyna znacząco rosnąć. W bibliografii tego zagadnienia przytoczone są przykłady rozwiązań (modeli matematycznych), którymi można wspomagać m.in. szacowanie liczby uszkodzeń. Do opisu cyklu życia obiektów technicznych wykorzystuje się zwykle funkcje o znanych postaciach rozkładów prawdopodobieństwa liczb uszkodzeń tych obiektów. Przedstawiona w niniejszym artykule procedura, zakłada korzystanie ze statystycznych danych o uszkodzeniach jednorodnej zbiorowości nieodnawianych obiektów technicznych, zapisanych w postaci empirycznej funkcji intensywności uszkodzeń. Służy ona w szczególności do wyznaczenia charakterystycznego punktu życia tych obiektów tj. chwili rozpoczynania się okresu uszkodzeń starzeniowych. W ramach procedury zastosowano model wnioskowania rozmytego, który odwzorowuje rozumowanie człowieka (eksperta systemu) obserwującego/badającego obiekty. Wyniki opracowanej procedury mogą stać się podstawą prognozowania uszkodzeń nieodnawianych obiektów technicznych typu mechanicznego.
Źródło:
Eksploatacja i Niezawodność; 2015, 17, 2; 282-287
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forecasting the failure of a thermal pipeline on the basis of risk assessment and exploitation analysis
Prognozowanie uszkodzenia ciepłociągu na podstawie oceny ryzyka eksploatacji
Autorzy:
Szybka, J.
Broniec, Z.
Pilch, R.
Powiązania:
https://bibliotekanauki.pl/articles/1366310.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
ciepłociąg
uszkodzenie
wytrzymałość rurociągu
ryzyko eksploatacji
prognozowanie uszkodzenia
thermal pipeline
failure
pipeline resistance
exploitation risk
forecasting failure
Opis:
W artykule przedstawiono procedurę postępowania w wyznaczenia okresu użytkowania ciepłociągu eksploatowanego w zakładach górniczych. Na podstawie badań przeprowadzonych w warunkach rzeczywistej eksploatacji prognozowano awarię rurociągu, która może być spowodowana pęknięciem na skutek przekroczenia jego wytrzymałości. Opisano warunki eksploatacji ciepłociągu i czynniki wpływające na jego degradację. W ujęciu probabilistycznym oszacowano ryzyko eksploatacji i wyznaczono okres użytkowania, po którym powinna nastąpić wymiana rurociągów.
In this paper, a procedure for determining the utilisation period of a thermal pipeline, exploited in mining plants was presented. On the basis of analyses conducted in the real life situations, the pipeline failure, which could be caused by its bursting due to exceeding pipeline strength, was forecasted. The exploitation conditions of the thermal pipeline and factors contributing to its degradation were also analysed. Using the probability sampling method, the exploitation risk was assessed and the lifespan of the pipelines, after which the pipelines shall be replaced by new structures, were determined.
Źródło:
Eksploatacja i Niezawodność; 2011, 4; 5-10
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rational microeconomic decisions and their non-optimal macroeconomic outcomes: the role for social institutions
Autorzy:
Koronowski, Adam
Powiązania:
https://bibliotekanauki.pl/articles/18104647.pdf
Data publikacji:
2020-01-19
Wydawca:
Szkoła Główna Handlowa w Warszawie. Kolegium Zarządzania i Finansów
Tematy:
underconsumption
market failure
economic policy
income distribution
Opis:
The paper analyzes possible policy and institutional responses to underconsumption (deficient consumption spending that leads to depressed economic activity). Underconsumption is an effect of a specific market failure; uncoordinated rational microeconomic decisions to keep labour costs low result in sub-optimal macroeconomic outcomes. Traditionally, any manifestations of demand constraints have been corrected with expansionary fiscal and monetary policies. These methods have ceased to be effective and viable. Alternative measures aimed directly to change income distribution are considered. Such measures (progressive income tax, stronger labour unions) would rather not gain acceptance of entrepreneurs even though in principle they should boost business activity. Non-confrontational solutions are beyond the reach of economic policy but good apprehension of the problem at hand in the democratic debate might lead to a better compromise with respect to social distribution of incomes.
Źródło:
Journal of Management and Financial Sciences; 2019, 39; 17-27
1899-8968
Pojawia się w:
Journal of Management and Financial Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ISSUES IN MODELLING THE FINANCIAL DISTRESS AND BANKRUPTCY OF COMPANIES
Autorzy:
Gruszczyński, Marek
Powiązania:
https://bibliotekanauki.pl/articles/453547.pdf
Data publikacji:
2015
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Katedra Ekonometrii i Statystyki
Tematy:
financial distress
bankruptcy
corporate failure
default risk
Opis:
Paper presents selected issues in designing and implementing models for financial distress and/or bankruptcy of companies. Major topics include: (1) definition of financial distress, (2) approaches to specify the distress variable, (3) aims and extent of the research on distress, (4) quantitative approaches in the field, including the attempt by Campbell, Hilscher and Szilagyi [2008], (5) survey of recent papers on the topic published in Poland.
Źródło:
Metody Ilościowe w Badaniach Ekonomicznych; 2015, 16, 1; 96-107
2082-792X
Pojawia się w:
Metody Ilościowe w Badaniach Ekonomicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Praise in the EFL Classroom
Autorzy:
Leis, Adrian
Powiązania:
https://bibliotekanauki.pl/articles/1371436.pdf
Data publikacji:
2021-07-09
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
growth mindset
failure
feedback
university students
praise
Opis:
This study investigates how praising students’ success in tasks affects the performance of other students who were not successful. Possible and impossible crossword puzzles were used as an experiment to engender fixed mindsets in half of the sample. The average time to complete a crossword puzzle at the pretest was compared to the average time to complete the same puzzle at the posttest. The results showed that students given possible crossword puzzles were able to make significant improvements in the speed with which they could complete the puzzle at the posttest stage. However, such improvements in performance were not seen among the students who had been temporarily primed into a fixed mindset during the experiment through the use of the impossible crossword puzzles. Reasons behind these results as well as pedagogical implications related to effective ways of giving praise and other feedback will be discussed.
Źródło:
Theory and Practice of Second Language Acquisition; 2021, 7, 2; 37-59
2450-5455
2451-2125
Pojawia się w:
Theory and Practice of Second Language Acquisition
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of adult patients with craniocerebral trauma complicated by venitalory failure
Autorzy:
Piskorz, J.
Iłżecka, J.
Wójcik, G.
Powiązania:
https://bibliotekanauki.pl/articles/2052233.pdf
Data publikacji:
2014
Wydawca:
Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:
carnio-cerebral trauma
respiratory failure
intracarnial pressure
Opis:
This article contains the current state of knowledge on modern methods of treating patients with severe cranio-cerebral injuries, hospitalized in intensive care due to respiratory failure. Severe traumatic brain injury (TBI) can be divided into primary and secondary. Primary brain damage takes place in mechanism of direct injury most often due to an impact. Secondary damage is the result of subsequent disorders of physiological conditions such as ischemia and hypoxia of the brain areas covered by the primary injury. Treatment of patients with severe cranio-cerebral injuries is focused on maintaining proper ventilation, hemodynamic stability and optimal values of intracranial pressure. Maintaining adequate blood flow through brain vessels is necessary to prevent the development of ischemic changes. Respiratory failure develops in these patients by direct injury to the brain in the form of tachypnea, bradypnoea, shortness of breath, sleep apnea, or secondarily to trauma as pneumonia, acute respiratory distress syndrome (ARDS), or pulmonary edema. Mechanical ventilation in patients with TBI seeks to maintain an oxygen partial pressure in the arterial blood of more than 11 kPa and the partial pressure of carbon dioxide in the range of 4.5 to 5.0 kPa. The use of appropriate therapy is to prevent the secondary damage to the brain or reduce complications associated with secondary damage.
Źródło:
Health Problems of Civilization; 2014, 08, 2; 4-9
2353-6942
2354-0265
Pojawia się w:
Health Problems of Civilization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Availability Analysis of Different PON Models
Autorzy:
Radoš, K.
Radoš, I.
Powiązania:
https://bibliotekanauki.pl/articles/308610.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
availability
failure
Passive Optical Network
protection fiber
Opis:
Due to the increasing demands of individual users, Passive Optical Networks (PON) are a promising technology for future broadband access networks. Reliable access to network services is a very important feature, so the availability of the connection is becoming one of the most important requirements. Failure of the optical fiber occurring between the Optical Line Terminal (OLT) and the passive optical splitter can cause the services becoming unavailable for a large number of users, so it is necessary to prevent such an occurrence by providing backup resources – in this case a spare optical fiber. When constructing the spare path (protection fiber), it is important to keep in mind that, if possible, the working and the spare fiber should not be positioned within the same cable. Failure of the optical fiber between the passive splitter and the individual user also means a loss of service for that user. In that case, protection may be offered by adding spare fibers. The question is, however, whether such a solution is cost-effective, as it would lead to a significant cost increase in the construction of the access network. This paper presents the availability analysis conducted for different PON models.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 4; 47-53
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problem of Interruptions in Reinforcement Works and Longwall Exploitation
Autorzy:
Biały, Witold
Powiązania:
https://bibliotekanauki.pl/articles/2064904.pdf
Data publikacji:
2020
Wydawca:
STE GROUP
Tematy:
technical measures
failure
longwall reinforcement
mining process
Opis:
This paper presents the problem of technical means failure, used both in longwall reinforcement and in the mining process. Longwall reinforcement – a concept related to launching a longwall mining excavation – is one of the most important elements in the process of hard coal seams exploitation. It consists in introducing all necessary machinery and equipment to the future longwall in order to enable the effective mining process. The efficiency of a longwall excavation as well as works related to the reinforcement of longwalls depends directly on properly selected machines and equipment of the longwall complex. In order to ensure greater effectiveness and efficiency, it is necessary to find the causes of the most frequent failures in these processes and effectively counteract them. These actions result in increased production availability of machines and equipment involved in the mining process. The increase of production availability is significantly influenced by the technical condition of technical means used both in longwall reinforcement and in the mining process, and their proper selection. This will ensure a largely failure-free and uninterrupted progress of works.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 83--92
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods for integrated Failure Risk Analysis of Water Network in terms of Water Supply System Functioning Management
Autorzy:
Tchórzewska-Cieślak, B.
Pietrucha-Urbanik, K.
Powiązania:
https://bibliotekanauki.pl/articles/2068882.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
water supply system
failure indicators
risk analysis
Opis:
In the paper the issues connected with failure risk analysis related to the functioning of this system were presented. In the analysis of water supply system it is important to assess the safety of its operation, both from the producer and the consumer point of view. The paper presents the method of analysis of consumers acceptance of water costs that companies bear for the risk reduction. The proposed method can be the basis of comprehensive program of risk failure management and in decision-making on water supply operation.
Źródło:
Journal of Polish Safety and Reliability Association; 2017, 8, 1; 157--166
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and assessment methods of water network failure in terms of belonging to critical infrastructure
Autorzy:
Tchórzewska-Cieślak, B.
Pietrucha-Urbanik, K.
Powiązania:
https://bibliotekanauki.pl/articles/2069170.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
water supply system
failure indicators
critical infrastructure
Opis:
In paper issues connected with safety and operation of the water supply system were presented. The study paid special attention to the safety aspect of water consumers in terms of belonging to critical infrastructure. In the paper the consumer risk of the first type associated with the lack or interruptions in water supply was defined, as well as the consumer risk of the second type associated with the consumption of water with incompatible quality with the regulation. The subject of risk assessment refers to the current trends in the world, which are intended to ensure the safety and comfort use of public water supplies.
Źródło:
Journal of Polish Safety and Reliability Association; 2016, 7, 1; 201--208
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water Distribution Subsystem: system failure analysis on view of Critical Infrastructure (CI) resilience and preparedness enhancement and management
Autorzy:
Piegdoń, I.
Tchórzewska-Cieślak, B.
Eid, M.
Powiązania:
https://bibliotekanauki.pl/articles/2069253.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
data collection
water pipe
failure
critical infrastructure
Opis:
The proper function of Water Distribution Subsystem (WDS) and its reliability has been a subject of many scientific researches for over 40 years. Important role in water network operation is water failures monitoring and failure analyse relating to its failure frequency index. The main problem of this kind of analyse is lack of data about failure (pipe diameter, pipe length, information on what street occurred the failure, the cause of failure). In this paper authors focus on analysis of water failure pipes for WDS in Podkarpackie Region. The statistical treatment has been made for real, operational data. Failure analysis and statistic treatment was carried out for pipes due to its function: main pipes, distribution pipes and water connections and according to pipe material. The article indicates the main cause of water pipe failure during the design, construction and operation stage, and also functioning dependence on other critical infrastructures. In addition, selected incidental events recorded in the Polish WDS was presented.
Źródło:
Journal of Polish Safety and Reliability Association; 2015, 6, 3; 115--126
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical Infrastructures Protection (CIP) : contribution to EU research on resilience & preparedness
Autorzy:
Eid, M.
Serafin, D.
Barbarin, Y.
Estel, L.
Cursi-Eduardo-de, S.
Hami-EL, A.
Powiązania:
https://bibliotekanauki.pl/articles/2069492.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
CIP
resilience
robustness
failure
preparedness
cascading effect
Opis:
Critical Infrastructure (CI) Preparedness and Resilience modelling, simulation & analysis (MS&A) receive a strong interest from systems safety and risk management engineering and research communities. This technical and scientific interest responds to the rapid growth of the use of the smart technology in the modern society activities. The concept of resilience in CIP is not yet clearly defined. However, a probabilistic model is proposed describing the robustness and the resilience of a well-defined infrastructure facing a given threat.
Źródło:
Journal of Polish Safety and Reliability Association; 2014, 5, 1; 47--56
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods to assess effects of cable failures caused by fire
Autorzy:
Piljugin, E.
Herb, J.
Röwekamp, M.
Berg, H, P.
Powiązania:
https://bibliotekanauki.pl/articles/2069632.pdf
Data publikacji:
2011
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
cable failure
fire
probabilistic risk assessment
FMEA
Opis:
It is state-of-the-art that a Level 1 PSA also includes a fire PSA for all plant operational states. In performing Fire PSA not only the malfunction of the components has to be assessed but also all supply systems and cables have to be traced for a given component. In the past it was assumed in the case of a fire in a compartment that all components and cables in that compartment are not functional anymore. However, this is in many cases a too conservative approach and could lead to overestimated fire induced core damage frequencies. Therefore, a method is necessary to assess in a more realistic manner the effects of cables failures caused by fire. Such a procedure requires a sound data base on equipment, list of cables and their properties as well as cable routing. Two methods are described which are currently developed. One of them is a cable failure mode and effect analysis which is easier to apply in practice.
Źródło:
Journal of Polish Safety and Reliability Association; 2011, 2, 1; 163--170
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimal reliability for components under thermomechanical cyclic loading
Autorzy:
Bittner, L.
Gottschalk, H.
Powiązania:
https://bibliotekanauki.pl/articles/205661.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
shape optimization
probabilistic failure times
optimal reliability
Opis:
We consider the existence of optimal shapes in a context of the thermo-mechanical system of partial differential equations (PDE) using the recent approach based on elliptic regularity theory (Gottschalk and Schmitz, 2015; Agmon, Douglis and Nirenberg, 1959,1964; Gilbarg and Trudinger, 1977). We give an extended and improved definition of the set of admissible shapes based on a class of sufficiently differentiable deformation maps applied to a baseline shape. The obtained set of admissible shapes again allows to prove a uniform Schauder estimate for the elasticity PDE. In order to deal with thermal stress, a related uniform Schauder estimate will be derived for the heat equation. Special emphasis is put on Robin boundary conditions, which are motivated by the convective heat transfer processes. It is shown that these thermal Schauder estimates can serve as an input to the Schauder estimates for the elasticity equation (Gottschalk and Schmitz, 2015). This is needed to prove the compactness of the (suitably extended) solutions of the entire PDE system in some state space that carries a C2-Hölder topology for the temperature field and a C3-Hölder topology for the displacement. From this, one obtains the property of graph compactness, which is the essential tool to prove the existence of optimal shapes. Due to the topologies employed, the method works for objective functionals that depend on the displacement and its derivatives up to third order, as well as on the temperature field and its derivatives up to second order. This general result in shape optimization is then applied to the problem of optimal reliability, i.e. the problem of finding shapes that have minimal failure probability under cyclic thermomechanical loading.
Źródło:
Control and Cybernetics; 2016, 45, 4; 421-455
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on Pre-Failure Deformations of Granular Soils
Autorzy:
Sawicki, A.
Powiązania:
https://bibliotekanauki.pl/articles/241240.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
granular soils
pre-failure deformations
instability line
Opis:
A simple model describing pre-failure deformations of granular soils is derived on the basis of a wide range of experimental data. The model is defined by two incremental equations describing the volumetric and deviatoric strains. Functions appearing in governing equations were determined from experiments performed in the triaxial apparatus, with additional measurements of lateral strains for some simple stress paths. These functions are different for loading and unloading, and have different shapes for contractive and dilative soil samples. The instability line is built into the structure of the model. The incremental equations were applied to predict the soil behaviour during anisotropic compression, including determination of the K0-line. Some basic statistical characteristics of the initial density index of investigated soils and deformations during isotropic compression are presented.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2007, 54, 3; 183-206
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of an innovative approach for complex, causally determined failure chains
Autorzy:
Bielefeld, O.
Dransfeld, H.
Schlüter, N.
Winzer, P.
Powiązania:
https://bibliotekanauki.pl/articles/407289.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
model-based failure analysis
reliability
quality
safety
Opis:
A high number of examples in today’s global industry prove that it is difficult to ensure a certain level of quality. One possible reason is the increasing complexity of modern mechatronic product systems. Interface problems due to several involved science disciplines and the lack of understanding subsystems, which are delivered by different suppliers, make it difficult to identify critical components and specifications of elements. Furthermore, it is even harder to estimate the effects of elements because of their unknown dependencies and relations. Therefore it becomes more and more improbable to develop a safe, sustainable and high quality product right from the beginning. In order to understand failures in complex system structures today’s engineering industries need a generic approach that increases the understanding of systems, identifies critical components and considers the different levels of a system. It shall examine failures that cause system errors but also failures that limit system functions. Thus, it is necessary to model and simulate the causally failure chains and analyse over several system levels and elements with their dependencies. This leads to a better understanding of the whole picture of cause and effect. This research paper points out which requirements this new model-based approach has to fulfill and how it is possible to link quality and reliability methods to achieve an overall understanding and analysis of a complex system to assure high quality and sustainability.
Źródło:
Management and Production Engineering Review; 2017, 8, 3; 3-12
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of results of placement of cuffed –tunneled hemodialysis catheter in internal jugular vein with subclavian vein for long -term dialysis
Autorzy:
Zafarghandi, Mohammad-Reza
Nazari, Iraj
Taghavi, Morteza
Salimi, Javad
Moini, Majid
Askarpour, Shahnam
Powiązania:
https://bibliotekanauki.pl/articles/1396126.pdf
Data publikacji:
2013-03-01
Wydawca:
Index Copernicus International
Tematy:
subclavian
internal jugular vein
hemodialysis
renal failure
Opis:
Aim of the study was to comparison between internal jugular vs. subclavian vein cuffed tunnel catheter placement for dialysis. Material and methods. Cases who required central venous catheter for dialysis were included in this study. Forty cases were included in this study and divided to two groups. Catheters were placed randomly in internal jugular vein or subclavian. Patients were followed for 6 months. Early and late complications of catheter’s placement were recorded. Analysis was done using Spss ver 13.0 (Chicago, IL, USA). Results. There were no significant differences between subclavian and internal jugular vein regarding occurrence of infection resulted in extraction or treatment. Also there were no significant differences regarding occurrence of thrombosis resulted in extraction or treatment. Failure rate was significantly higher in cases with internal jugular vein catheter compared to cases with subclavian vein catheter (p=0.04). Conclusion. Failure rate was significantly higher in cases with internal jugular vein catheter compared to subclavian cathether. Subclavian catheter is more appropriate route for catheter placement.
Źródło:
Polish Journal of Surgery; 2013, 85, 3; 133-136
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uporczywość jako znamię wykroczenia skarbowego z art. 57 § 1 k.k.s. – wybrane problemy interpretacyjne i dowodowe
“Tenacity” as a significant factor of fiscal offence from the Article 57, Section 1 of Penal and Fiscal Code – chosen problems for interpretation and evidence
Autorzy:
Marciniak, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/697534.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Opolski
Tematy:
persistence
failure to pay tax on time
Opis:
Article 57(1) of the Fiscal Criminal Code penalises a fiscal misdemeanour that consists in a taxpayer’s persistent failure to pay tax on time. The element of ‘persistence’ is subject to assessment, giving rise to many doubts and controversies. As regards the offences described in Articles 209(1), 218(1a) and 190a(1) of the Criminal Code, an objective-subjective understanding of that element is prevalent, which takes into account the prolonged nature and repeatability of conduct in question, as well as the perpetrator’s special, negative attitude to his obligation. It is emphasised, at the same time, that the persistence element is only established when the perpetrator has an objective possibility to fulfil his obligations. However, in its order of 28 November 2013, the Supreme Court adopted a partly different interpretation of ‘persistence’, according to which it may be indicated not only by the cyclic nature of the conduct, but also by a onetime, but prolonged, omission to pay a tax that is payable on a one-time basis. That interpretation has been criticised by many legal scholars. It is, nevertheless, frequently applied in the practice of the justice system. Following amendments to the Code of Criminal Procedure, introduced by the Act of 27 September 2013 on amending the Code of Criminal Procedure and certain other acts, which came into force on 1 July 2015, evidence is taken, on principle, by the parties, after it is allowed by the division president or the court. The court may allow and take evidence exofficio only in exceptional cases justified by special circumstances. Currently, it is, therefore, the trial parties that are required to prove whether the ‘persistence’ element is present or absent. The amendment of the provisions concerned and the existing case law have induced the author to take up the issue in question.
Źródło:
Opolskie Studia Administracyjno-Prawne; 2016, 14, 1; 59-76
2658-1922
Pojawia się w:
Opolskie Studia Administracyjno-Prawne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Razušenie materialov pri dinamičeskom kontaknom nagruženii
Failure of materials at dynamic contact loading
Autorzy:
Bogdanovič, P.
Tkačuk, D.
Bliznec, D.
Powiązania:
https://bibliotekanauki.pl/articles/386590.pdf
Data publikacji:
2007
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
failure of materials
dynamic
silicate glass
sapphire
Opis:
The paper reports data on the kinetics, failure mechanism, and wear rate of silicate glass and sapphire in high-speed abrasive machining. Regularities of the effect of the load the velocity of abrasive particle movement, and the duration of the cutting of sapphire and the diamond monocrystal on temperature fields in the cutting zone and adjacent areas are discussed. I is shown that at high velocities me maximal surface temperature position shifts outside the contact site and temperature stresses cause the thermal cracking of sapphire and glass in this zone. When cutting a diamond monocrystal the temperature in the cutting zone can reach values sufficient for its local graphitization to occur.
Źródło:
Acta Mechanica et Automatica; 2007, 1, 1; 15-18
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie charakterystyk eksploatacyjnych uszkodzeń pojazdów kołowych
Research of exploitation failure characteristics of wheeled vehicles
Autorzy:
Goliasz, Tomasz
Pszczółkowski, Józef
Powiązania:
https://bibliotekanauki.pl/articles/315620.pdf
Data publikacji:
2019
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
uszkodzenie
niezawodność
system obsługiwania
failure
reliability
exploitation
Opis:
W artykule dokonano oceny charakteru zdarzeń eksploatacyjnych polegających na wystąpieniu w pojeździe awarii wymagającej wykonania naprawy bieżącej. Zbudowano empiryczne charakterystyki uszkodzeń badanej grupy pojazdów w wybranym wojskowym systemie eksploatacji. Dokonano oceny zgodności empirycznych rozkładów z rozkładem wykładniczym i normalnym. Porównanie zostało wykonane na podstawie testu zgodności chi kwadrat. Zwrócono uwagę na potrzebę umiejętnego budowania baz danych eksploatacyjnych w celu wykorzystania ich do badania procesów eksploatacyjnych flot pojazdów na małą i dużą skalę.
The article is dedicated to utilization of cars and small buses. It includes three parts. In the first one authors consider general rules regarding creating equipment utilization data bases and how it may be used regarding reliability methods. There is mentioned that it is crucial regarding optimization of all processes in enterprises. In the second part there are presented some results regarding exploitation of technical objects. The results are much more interested because same mathematical and statistical methods were used to present them in the article. The third part is conclusion regarding all methods and results received during analysis.
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2019, 20, 1-2; 203-210
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anisotropic fracture criterion of Ti6Al4V titanium alloy under wide range of strain rates
Autorzy:
Moćko, W.
Kostrzewski, C.
Powiązania:
https://bibliotekanauki.pl/articles/279621.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
titanium alloys
failure
fracture
anisotropy
Hopkinson bar
Opis:
The new fracture criterion taking into account stress triaxiality, strain rate and anisotropy is introduced in this paper. The model is capable to predict the influence of the loading direction on the fracture strain. The equation is applied to estimate the fracture locus of Ti6Al4V titanium alloy under quasi-static and dynamic loading regimes.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 741-745
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the airframe systems affecting safety risks caused by large aircraft
Autorzy:
Balicki, W.
Głowacki, P.
Kawalec, M.
Powiązania:
https://bibliotekanauki.pl/articles/245601.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
large aircraft
failure
ATA chapter
safety level
Opis:
Hazard is a safety condition that could cause or be a part of unsafe aircraft operation. It also has an impact on aviation safety related to aircraft systems as well as services. Safety risk is a part of so-called safety management and is the predicted probability and severity of the outcomes of a hazard. Aircraft utilized by airlines and cargo operators which have MTOM >5700 kg are defined by authors as a large aircraft and have to be treated in their systems reliability analysis separately from small aircraft. Despite the fact that both types of aircraft categories events are included in the same databases - European Coordination Centre for Aviation Incident Reporting Systems (ECCAIRS) and Aircraft Continuing Airworthiness Monitoring (ACAM), due to different predominant systems failures could not be considered in the same way. The authors have performed processing of the data contained in available databases analysing large aircraft airframe systems faults, which were assigned to the specific ATA chapters. The most frequently occurring defects of the aircraft systems were identified. The goal of this article is to present a method of the current reliability of large aircraft systems assessment. Based on it, the authors are proposing a way of safety risk estimation and prediction of the safety levels for the next two years. The results of this analysis may support the decisions of supervisory authorities in the areas where security threats are most important. They can also help aircraft operators with identification of the aircraft systems, which require special attention.
Źródło:
Journal of KONES; 2016, 23, 1; 39-46
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Systemy i warunki eksploatacji urządzeń w zakładach piekarskich
Systems and service conditions of bakery equipment
Autorzy:
Diakun, J.
Sobieraj, I.
Powiązania:
https://bibliotekanauki.pl/articles/290762.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
eksploatacja
awaryjność
piekarnictwo
operation
failure frequency
bakery
Opis:
Na przykładzie wybranych, charakterystycznych zakładów piekarniczych przeprowadzono analizę warunków eksploatacji urządzeń technologicznych. Do obserwacji wybrano pięć piekarń o różnej wielkości. Podstawą analizy były dane zebrane w zakładach oraz monitoring warunków eksploatacji z okresu trzech miesięcy. Oceniano adekwatność systemu eksploatacji do potrzeb i sprawność jego funkcjonowania.
An analysis of service conditions of technological equipment was carried out on the basis of some sample bakeries. Five bakeries of different size were selected for analysis.The analysis was based on the data collected in plants and the service conditions monitored within the period of three months. The adequacy of operational systems to the requirements and the efficiency of its performance were evaluated.
Źródło:
Inżynieria Rolnicza; 2005, R. 9, nr 9, 9; 51-57
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zadania pielęgniarki w opiece nad pacjentem z ostrą niewydolnością nerek
Supporting the patients care after aacute renal failure
Autorzy:
Pawlak, Natalia
Szlachciak, Ida
Haor, Beata
Powiązania:
https://bibliotekanauki.pl/articles/1029904.pdf
Data publikacji:
2018
Wydawca:
Państwowa Uczelnia Zawodowa we Włocławku
Tematy:
acute renal failure
oliguria
sepsis
nursing
icnp®.
Opis:
Introduction. The acute renal failure is a complication that is often reported in patients treated in the ICU. At least 20% of patients staying in this ward suffer from the acute renal failure. Therefore patient care in the event of immediate danger to life should be liable to an early recognition of the symptoms indicating renal impairment. Aim. The aim of the study is to define nurses’ role in supporting patients suffering from the acute renal failure. Case study. Patient (male), 52- year- old, admitted to the AIIT ward. He was diagnosed with acute renal failure, caused by sepsis and the operative treatment of the abdominal aortic aneurysm. Discussion. In patients with the acute renal failure the main concern regarding patient care is the risk of dehydration. Dehydration can cause fluid or electrolyte imbalance and it is essential to prevent such situation in order to be able to improve patient's quality of life. Conclusions. Applying ICNP ® in planning the nursing care for patients in OAiIT with severe renal impairment enables to monitor the number, character as well as the quality of nursing services provided.
Wstęp. Ostra niewydolność nerek jest powikłaniem często obserwowanym u chorych leczonych na Oddziale Intensywnej Terapii . Pojawia się u co najmniej 20% pacjentów przebywających w tym oddziale. W związku z tym opieka na pacjentem w stanie zagrożenia życia powinna być nastawiona m.in. na zatrzymanie oraz wczesną identyfikację objawów wskazujących na zaburzenie czynności nerek. Cel pracy. Celem pracy jest określenie zadań pielęgniarki w opiece nad pacjentem z ostrą niewydolnością nerek. Prezentacja przypadku. Pacjent w wieku 52 lat przyjęta do oddziału AiIT. Zdiagnozowano i niego ostrą niewydolność nerek, spowodowaną przebytą sepsą oraz operacją tętniaka aorty brzusznej. Dyskusja. U pacjentów z ostrą niewydolnością nerek głównym problemem pielęgnacyjnym jest ryzyko odwodnienia. Kluczową rolę w pielęgnacji odgrywa prewencja zaburzeń gospodarki wodno – elektrolitowej, która umożliwia poprawę jakości życia pacjentów. Wnioski. Zastosowanie ICNP® w projektowaniu opieki pielęgniarskiej wobec pacjenta w OAiIT z ostrą niewolnością nerek umożliwia monitorowanie liczby, charakteru oraz jakości udzielanych świadczeń pielęgnacyjnych.
Źródło:
Innowacje w Pielęgniarstwie i Naukach o Zdrowiu; 2018, 3, 2; 106-128
2451-1846
Pojawia się w:
Innowacje w Pielęgniarstwie i Naukach o Zdrowiu
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cardiac Rehabilitation in Heart Failure. Part I, Mechanism
Autorzy:
Kujawska, Agnieszka
Husejko, Jakub
Marszałek, Agata
Szczęśniak, Żaneta
Topka, Weronika
Gajos, Małgorzata
Androsiuk-Perkowska, Joanna
Perkowski, Radosław
Natalia, Skierkowska
Kujawski, Sławomir
Kędziora-Kornatowska, Kornelia
Powiązania:
https://bibliotekanauki.pl/articles/1030501.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
cardiac rehabilitation
exercise training
heart failure
pathophysiology
Opis:
Diagnosis and treatment issues among heart failure (HF) patients are becoming one of the most important points in public health of developed countries, largely due to the aging of population and the fact that HF affects mainly the elderly. In this review we would like to focus on pathophysiology of exercise intolerance in patients with heart failure and potential benefits of cardiac rehabilitation (CR). Analysis of articles in the EBSCO database using keywords: heart failure, cardiac rehabilitation, exercise training, pathophysiology. HF can be described as a composite syndrome which results from structural or functional impairment of ventricular filling or blood ejection. Patients have variety of symptoms which usually are nonspecific. The most frequently occurring symptoms of HF are dyspnea and fatigue, which may restrict exercise capacity, and fluid retention. There are many possible pathophysiological factors involved in the development of exercise intolerance. Based on the available literature pathological changes in central hemodynamic function, pulmonary system, skeletal muscles, endothelial function and neurohumoral system can be distinguished. They play a crucial role in the pathogenesis of HF symptoms and represent a potential curative object. HF patients are characterized by diminished functional performance. Exercise training has many potential profits in patients with heart failure, including an increase in peak oxygen uptake, improvement in central hemodynamics, peripheral vascular and skeletal muscle function and has become part of evidence-based clinical therapy in these patients.
Źródło:
Central European Journal of Sport Sciences and Medicine; 2018, 21, 1; 13-21
2300-9705
2353-2807
Pojawia się w:
Central European Journal of Sport Sciences and Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Health behaviour of elderly patients with heart failure in Poland associated with pharmacotherapy and non-pharmacological treatment
Autorzy:
Makarewicz-Wujec, Magdalena
Janas, Ewelina
Kozłowska-Wojciechowska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/895264.pdf
Data publikacji:
2019-04-30
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
heart failure
health behaviour
adherence
elderly patients
Opis:
Introduction. In Poland, it is estimated that HF is observed in approximately 0,7 million of patients. The aim of the study was to assess health behaviour in geriatric patients diagnosed with HF regarding pharmacotherapy and non-pharmacological treatment. Material and methods. The study group comprised 72 patients with diagnosed HF, over 65y. The study was performed using a questionnaire survey including 20 closed-ended questions. Results. The mean number of medicinal products prescribed by physicians for the treatment of HF and other diseases was 6.59±1.8. 50% of subjects were additionally taking medications and supplements for self-treatment, 63% declared they managed to take medications prescribed on their own. A diet is followed only by 50%, but only 18% limit their sodium intake. 46% still consume alcohol, and 10% of still smoke cigarettes. 46% declared the use of body weight monitoring, but none of them measured their body weight every day. Conclusion. Health behaviour of geriatric patients with HF in Poland indicates their low compliance with medical guidelines and it may explain a high hospitalisation rate and increasing costs of treatment.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 2; 367-374
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nutrition and peritoneal dialysis patients – a review
Autorzy:
Kourkouta, L.
Monios, A.
Frantzana, E.
Iliadis, Ch.
Powiązania:
https://bibliotekanauki.pl/articles/1917517.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
haemodialysis
renal failure
Diet
Peritoneal Dialysis
nutrition
Opis:
Introduction: The Peritoneal Dialysis (PD) is a preferable treatment option of the renal replacement in patients with chronic renal failure (CRF) end stage. Purpose: The purpose of this study was to review of articles published related to the contribution of nutrition to health promotion of patients undergoing haemodialysis.Materials and methods: A review of the Greek and international literature on the subject was Performed through the electronic databases Medline, Google Scholar, Scopus and the Association of Greek Academic Libraries Link (Heal-Link), using as key words the following terms:haemodialysis, renal failure, peritoneal dialysis, nutrition.Most of the articles used in this literature review were recently published. Only few old - dated articles were included in the study and the reason was their significant contribution to the field. The exclusion criteria for the articles were the languages except from English and Greek.Results:Patient’s diet must contain 1.3 g of protein per kilogram of body weight per day. Consumption of foods rich in carbohydrates should be limited. Patients should consume foods with the adequate quantity of phosphorus and potassium. Finally, they should have their sodium levels and fluid intake checked because sodium causes severe thirst that can lead to excessive fluid intake. As a result, the patient experiences swelling, shortness of breath and high blood pressure.Conclusion: Patients who undergo peritoneal dialysis must be checked regularly and pay special attention to their diets.
Źródło:
Progress in Health Sciences; 2015, 5, 2; 205-210
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fuzzy-FMEA risk evaluation approach for LHD machine - a case study
Autorzy:
Balaraju, Jakkula
Raj, Mandela Govinda
Murthy, Chivukula Suryanarayana
Powiązania:
https://bibliotekanauki.pl/articles/1839008.pdf
Data publikacji:
2019
Wydawca:
Główny Instytut Górnictwa
Tematy:
risk
failure
FMEA
RPN
LHD
ryzyko
awaria
Opis:
Improvement of productivity has become an important goal for mining industries in order to meet the expected targets of production and increased price competitiveness. Productivity can be improved in different ways. The effective utilization of men and machinery is one such way. Equipment is prone to numerous unexpected potential failures during its operation. Failure Mode and Effect Analysis (FMEA) is one of the suitable techniques of reliability modeling used to investigate the failure behavior of a complex system. In conventional FMEA, the risk level of failures, a ranking of failures and prioritization of necessary actions is made on the basis of estimated Risk Priority Number (RPN). While this approach is easy and uncomplicated, there are a few flaws in acquiring the best approximation of the failure. The estimation of RPN is made by multiplying the Severity (S), Occurrence (O) and Detection (D) alone and irrespective of the degree of importance of each input. Hence, a new risk management approach known as the Fuzzy rule base interface system was proposed in this research in order to mitigate the failures. Fuzzy FMEA is designed in order to acquire the highest Fuzzy RPN value which will be used as the focus of enhancements to reduce the probability of occurrence of some kind of failure for a second time. This study focused on the Root Cause Analysis (RCA) of underground mining machinery such as Load-Haul-Dumper (LHD). 16 potential risks of various sub-system breakdowns were identified in Fuzzy FMEA. The highest value of RPN 168 (for potential failure mode-F9) was obtained for the electrical subsystem (SSE), as was the highest FRPN 117 (F9). There is a difference between the RPN and FRPN values. The FRPN value is obtained from Fuzzy field generation with consideration of the degree of importance of the given input data. In addition, the recommendations were made based on the analysis to reduce the uneven occurrence of failures.
Źródło:
Journal of Sustainable Mining; 2019, 18, 4; 257-268
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards the development of a topological model to assess networks performance : connectivity, robustness and reliability
Autorzy:
Eid, M.
Cursi-Eduardo-de, S.
EL Hami, A.
Powiązania:
https://bibliotekanauki.pl/articles/2069415.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
network
robustness
connectivity
reliability
failure
critical states
Opis:
Networks are the widest spreading system which Mankind has ever developed, today. New needs, services, and use are created each day where network systems represent the most critical aspect. Additionally, the interconnection between networks of different types is growing as never. This acceleration of interconnection of all sorts brings to the front scene the issue of performance measure in networks design and operation. For that purpose, engineers are orienting their major efforts towards the development of methods, models and codes to assess and measure networks performance in terms of probability of being connected. From this stand point of view, the engineers’ attention is mainly focused on defining the network “Connectivity” and measuring it, in different manner, using probabilities. Subsequently, we are observing an accelerating course towards quantitative probabilistic models to describe and assess networks’ Connectivity, since the sixties. Modelling realistic networks is still far from being satisfactorily achieved using quantitative probabilistic models. On the other hand, little room has been lift to exploring the potential of graphical and topological models to develop qualitative and semi- quantitative models in order to assess networks performance. In this paper, we have tried to explore the potential of the topological modelling and are proposing an original one. The proposed model is still in its earliest phase of development. But, it sounds very promoting at that stage of maturation. According to this model, the term “performance” may be extended, beyond the “connectivity probabilistic concept”, to “robustness” and to a “deepest insight” of the “connectivity concept” itself. The impact is immediate on the way the “reliability concept” would be extended to cover network systems.
Źródło:
Journal of Polish Safety and Reliability Association; 2012, 3, 1; 21--38
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The random failure rate
Autorzy:
Grabski, F.
Powiązania:
https://bibliotekanauki.pl/articles/2069577.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
reliability
random failure rate
semi-Markov process
Opis:
A failure rate of the object is assumed to be a stochastic process with nonnegative, right continuous trajectories. A reliability function is defined as an expectation of a function of a random failure rate process. The properties and examples of the reliability function with the random failure rate are presented in the paper. A semi-Markov process as the random failure rate is considered in this paper.
Źródło:
Journal of Polish Safety and Reliability Association; 2007, 1; 143--149
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Failure risk analysis in the water distribution system
Autorzy:
Tchórzewska-Cieślak, B.
Powiązania:
https://bibliotekanauki.pl/articles/2069656.pdf
Data publikacji:
2010
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
risk analysis
failure
risk
water distribution system
Opis:
A water distribution system (WDS) ought to be high reliable continuous operating system. Failure factors in WDS should be identified and prioritised, for example, the causing factors in the most frequent failures in water-pipe network. In this paper, the failure risk analysis of the WDS is presented, and accordingly, a New method consisting the failures index (FI) and the evaluation of risk of failure within the relevant area, based on the assumed categories (tolerable, controlled and unacceptable risk). It is expecting that the methodology for the WDS performance risk analysis would provide the city leadership for decision making support.
Źródło:
Journal of Polish Safety and Reliability Association; 2010, 1, 1; 247--254
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anchorage systems in FRP - strengthened reinforced concrete
Autorzy:
Tworzewski, P.
Bacharz, K.
Michałowska-Maziejuk, D.
Powiązania:
https://bibliotekanauki.pl/articles/105140.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
reinforcing
strengthening
FRP
anchorage systems
failure modes
Opis:
The main aim of this article was to present recently evolved methods of strengthening flexural reinforced concrete beams, as well as the concreteanchorage system bond strength problems in composites that were either surface mounted or inserted in the pre-cut grooves in the concrete cover. The focus is on the beams strengthened with the carbon FRP (CFRP - carbon fiber reinforced polymer) composites to show the basic advantages and drawbacks associated with their installation and bond performance. Domestic and foreign experiments investigating the EBR and NSMR strengthening systems were discussed to show their efficacy, common failure modes and the factors initiating the debonding process. Debonding problems and solutions to those problems were illustrated using the example of a composite material attached to the outer surface of concrete in the shear zone of reinforced concrete beams The article provides guidelines for checking the anchorage capacity for the existing longitudinal reinforcement with the simultaneous action of bending moment and shear force in the support zone of the reinforced concrete beam.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 3; 101-110
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deformation and energy parameters of fracture of steel of the main gas pipeline
Autorzy:
Maruschak, P
Panin, S
Polyvana, U
Vuherer, T.
Guzanová, A.
Brezinová, J.
Powiązania:
https://bibliotekanauki.pl/articles/102385.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
impact toughness
main gas pipeline
failure analysis
Opis:
By example of steel 17G1S, the regularities in the impact fracture of Charpy specimens at normal and low temperatures are described. The relationship between the energy parameters of fracture (impact toughness) and the deformation response of the material (the height of shear lips) of the specimens from the pipe steel is established. The micromechanisms of impact fracture of the material are described. At 20 °C and –30 °C, focal splitting of the material was observed on the fracture surface of specimens; at –60 °C, the material failed in a brittle manner by the mechanism of cleavage.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 28; 40-46
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Set of Suffosion Holes Occurring After a Water Supply Failure as a Structure with Fractal Features
Autorzy:
Iwanek, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2105274.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
water pipe failure
suffosion hole
fractal feature
Opis:
As a result of a buried water pipe unsealing, water often flows from the pipe to the soil surface, washing out the solid particles of soil and creating the so-called suffosion holes. It is a dangerous phenomenon, especially in urbanized areas, where it poses a threat to human safety and the stability of infrastructure. Uncontrolled outflows of water from water pipes belong to the main causes of suffosion in cities, occur in all water networks around the world and are difficult to predict. Therefore, it seems to be important to determine the size of the so-called the protection zone, which is the area around the potential leak where, in the event of a water pipe failure, it would be possible for water to flow in the soil. The analysis of the suffosion holes distribution around the place of leakage may be helpful in determining the size of the protection zone. Previous studies have shown that this distribution is random. Thus, the structure consisting of suffusion holes creates a certain geometric shape, which is difficult to describe using the classical concepts of Euclidean geometry. The study showed that this structure meets the conditions for probabilistic fractals, which means that elements of fractal geometry can be used to determine the size of the protection zone.
Źródło:
Journal of Ecological Engineering; 2022, 23, 6; 164--171
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calibration of the Ductile Failure Criterion for Nickel-Based Superalloys taking into Account the Localization of the Strain
Autorzy:
Madejski, B.
Socha, G.
Powiązania:
https://bibliotekanauki.pl/articles/97929.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
equivalent plastic strain
tensile test
failure criterion
Opis:
Static tension test allows characterization of material strength properties. This simple test provides input data for numerical calculation of structural components made of the tested alloy. Elastic, plastic and failure behavior of the structural component in question is simulated, using, for example, the FEM package, based on parameters obtained as the result of tensile testing. When using the results of the tensile test for modeling the material failure it is important to estimate correctly plastic strain corresponding to failure. It is common practice to use elongation of the specimen gage part for the calculation of failure strain. On the other side, the most popular ductile failure criterion used by engineers performing numerical simulation of the material’s behavior relies on the equivalent plastic strain as the criterial quantity. Those two parameters can differ significantly. In order to calculate the equivalent plastic strain correctly, we have to remember about strain localization (necking) appearing during tensile tests and take into account the fact that during tensile testing we have three non-zero strain tensor components. Ignoring this fact, and using only elongation as the criterial quantity can lead to enormous simulation error. This error is analyzed in this paper for nickel based superalloy tested at elevated temperatures.
Źródło:
Fatigue of Aircraft Structures; 2017, 9; 27-37
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przygotowanie do samoopieki pacjenta z niewydolnością nerek
Preparation for self-care of a patent with kidney failure
Autorzy:
Pawlik, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/470120.pdf
Data publikacji:
2012
Wydawca:
Europejskie Centrum Kształcenia Podyplomowego
Tematy:
niewydolność nerek
dializoterapia
kidney failure
dialisys therapy
Opis:
Wstęp: W ostatnich latach zauważa się lawinowy wzrost liczby chorych na niewydolność nerek, poddawanych zabiegom hemodializy. Główną przyczyną tego stanu jest wzrost zachorowalności na nadciśnienie tętnicze i cukrzycę. Leczenie nerkozastępcze hamuje postęp choroby, jednocześnie pozwala na wydłużenie życia. Istnieją dwie formy terapii: dializoterapia i przeszczep nerek (transplantacja nerek). W Polsce najczęściej stosowaną metodą dializoterapii jest hemodializa, zaś rzadziej wykorzystywana jest dializa otrzewnowa. Cel pracy: Ocena poziomu przygotowania do samoopieki pacjentów z niewydolnością nerek poddawanych dializoterapii. Materiał i metody: Badania przeprowadzono w Stacji Dializ Diaverum Polska Sp. z o.o. w Sanoku, wśród osób poddawanych zabiegom hemodializy. Metodą sondażu diagnostycznego, wykorzystując autorski kwestionariusz ankiety, przebadano 50 osób w wieku 34–89 lat. Wyniki: W badaniach wykazano, iż główną przyczyną powstania niewydolności nerek wśród badanych była cukrzyca (34%) i nadciśnienie tętnicze (20%). Zdecydowana większość badanych osób zaakceptowała swoją chorobę i radzi sobie z jej skutkami. Zalecenia dietetyczne w przewlekłej chorobie nerek znane są 82% badanych, a 70% respondentów wciela je w życie. Kontrola pracy przetoki to codzienna praktyka dla 47 ankietowanych, a niemal ¾ badanych wykonuje trening przetoki z różną częstością. Niemal wszyscy badani przekonani są o istotnej roli edukacji zdrowotnej w tworzeniu warunków dla utrzymania i poprawy zdrowia. Przekazywanie wiedzy na temat codziennego funkcjonowania w chorobie nerek należy według grupy badawczej do zadań personelu pielęgniarskiego i lekarskiego. Wnioski: Pacjenci znają i przestrzegają zaleceń dietetycznych, potrafią samodzielnie kontrolować i pielęgnować przetokę tętniczo-żylną, jak również właściwie reagować w przypadku objawów niewłaściwej jej pracy. Wskazuje to na prawidłowe przeprowadzenie edukacji w zakresie samokontroli i samoopieki pacjentów z niewydolnością nerek.
Background: In recent years there has been noticed a high increase in amount of patients with kidney failure who had haemodialysis. The most common cause is increase in becoming ill with arterial hypertension and diabetes. Haemodialysis treatment stops the progress of the condition and at the same time it lets extend the lifespan of patients. There are two forms: dialysis therapy and kidney transplantation. In Poland, the most commonly used method of dialysis therapy is haemodialysis, also less popular peritoneal dialysis. Objectives: The aim of the work is evaluation of the level of preparation for self-care of a patient with kidney failure in stage of dialysis therapy. Material: The research was conducted in Dialysis Station Diaverum Poland Sp. z o.o. on a group of fifty patients who underwent haemodialysis. Methods: The method of my research was diagnostic survey and the research tool was a questionnaire consisting of twenty six questions. The questions in the questionnaire were mostly open-ended so that people could express their own opinions but closed- ended ones were also included. They were divided into five categories describing customers’ physical and psychological condition, knowledge of self-care and implementing and complying to diet, control and exercises of pulse-vein fistula, patients’ attitude to health education and general information on treating with haemodialysis. Results: On the basis of the collected material I can conclude that patients can cope with weakness occurring after renal dialysis. They can also control the work of pulse-vein fistula themselves and exercise observing the given methods. In case of emergency, they are able to eliminate factors endangering the fistula to stop working and complying to diet instructions is not an issue to them. This shows proper training and educating patients in the field of self-care and self-control.
Źródło:
Współczesne Pielęgniarstwo i Ochrona Zdrowia; 2012, 1; 2-4
2084-4212
Pojawia się w:
Współczesne Pielęgniarstwo i Ochrona Zdrowia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reliability Evaluation of Transmission Planetary Gears “bottom-up” approach
Autorzy:
Živković, Predrag
Milutinović, Miroslav
Tica, Milan
Trifković, Spasoje
Čamagić, Ivica
Powiązania:
https://bibliotekanauki.pl/articles/24200801.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
planetary gear
failure rate
reliability
bottom-up
Opis:
The reliability study is the most important part of the engineering design process, as it is the basis of analysis and assessment of future product performance in exploitation. Since performance cannot be predicted with absolute certainty, the application of reliability theory includes probability theory and unreliability modeling. The proposed approach has been applied to assess the reliability of gear planetary power transmissions. The assessment of system reliability was determined on the basis of the block diagram method, as a function of the reliability of individual components, calculated by statistical analysis. Using the Weibull model, the reliability of the planetary gear was defined on the basis of the probability of failure of the gear teeth and the results were interpreted to assess the reliability of the component and the entire planetary train. For a more precise assessment of reliability and to avoid modeling every failure and mode of occurrence, a competitive risk model was developed. The reliability assessment study was conducted with a “bottom-up” approach. Reliability has been assessed, for instantaneous, estimated and assigned failures rate of planetary train and component.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 1; art. no. 2
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Failure modeling and reliability analysis for motion mechanism with clearance joints under plastic deformation and wear
Autorzy:
Liu, Jingyi
Xue, Shilong
Zhang, Kaichao
Pang, Huan
Powiązania:
https://bibliotekanauki.pl/articles/27312787.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
performance failure
repeated impact
wear
mechanism reliability
Opis:
The performance failure and reliability of motion mechanism has a significant effect on industry reliability, operation safety and production economy. Motion precise is one of the typical performance indicators especially for motion mechanism with multibody and joints, which will be influenced by necessary joint clearance. Size of joint clearance degenerates with usage such as wear and deformation. Repeated start-stop lead to impact stress and plastic deformation for clearance joint particularly for mechanism with high load and long working cycles. Nevertheless, current research ignoring the coupling of plastic deformation and wear, which will cause a different wear process and mechanism performance failure. This study attempts to investigate the wear process and performance failure model of multibody mechanism with clearance joints considering plastic deformation and wear. Quantification of plastic deformation caused by repeated impact stress of joints is studied by formulation. Then, a novel wear process model is established on the basis of Archard model, after which performance failure indicator of motion mechanism is conducted. In case study case, a linkage motion mechanism with multi revolution joints used in industry assemble line is studied to demonstrate proposed methods and models. This investigative study provides valuable guidelines for degeneration prediction and failure or reliability analysis of motion mechanism.
Źródło:
Eksploatacja i Niezawodność; 2023, 25, 3; art. no. 169920
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation on gas supply reliability of urban gas pipeline network
Ocena niezawodności dostaw gazu w miejskiej sieci gazowej
Autorzy:
Li, J.
Yan, M.
Yu, J.
Powiązania:
https://bibliotekanauki.pl/articles/300953.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
urban gas network
gas supply reliability
failure condition
flow reduction
pipeline failure
failure rate
miejska sieć gazowa
niezawodność dostaw gazu
warunki uszkodzenia
ograniczenie przepływu
uszkodzenie gazociągu
intensywność uszkodzeń
Opis:
As one of the lifeline projects, an urban gas network is a complex system, as it requires maintenance of the supply capacity when any single pipeline is isolated due to failure. For such a system, its reliability needs to be evaluated. Considering that existing structural reliability and hydraulic reliability analyses reflect different aspects of the working conditions of an urban gas network, system reliability theory is employed to explain that only the gas supply reliability can achieve a comprehensive evaluation of the work capacity of the entire urban gas network, as it takes into account the combined influence of the structural reliability and hydraulic reliability. To calculate the parameters in the gas supply reliability evaluation, such as pipeline failure rate, flow reduction in the gas network under different failure conditions, etc., some research achievements in the field of structural reliability and hydraulic reliability are fully utilized. Then, the detailed calculation procedures of these parameters are given to evaluate the gas supply reliability in terms of operational and practical considerations. Finally, using an example of a simple double-loop gas network, the detailed process of the gas supply reliability evaluation of an urban gas network is described, and the feasibility of this evaluation method is also illustrated.
Miejska sieć gazowa – jeden z kluczowych elementów infrastruktury miasta – stanowi złożony system, ponieważ wymaga utrzymania zdolności przesyłowej gdy przepływ gazu w jednym z rurociągów zostaje zamknięty w wyniku awarii. W przypadku tego rodzaju systemów, konieczna jest ocena niezawodności. Biorąc pod uwagę, iż dostępne w literaturze analizy niezawodności konstrukcyjnej i niezawodności hydraulicznej odzwierciedlają różne aspekty warunków pracy miejskiej sieci gazowej, nie dają one pełnego obrazu niezawodności systemu jako całości. W artykule wykorzystano teorię niezawodności systemów, która pokazuje, że jedynie ocena niezawodności dostaw gazu stanowić może kompleksową ocenę wydajności pracy całej miejskiej sieci gazowej, ponieważ uwzględnia ona zarówno wpływ niezawodności konstrukcji jak i niezawodności hydraulicznej sieci. W pracy wykorzystano dotychczasowe obserwacje badawcze dotyczące oceny niezawodności konstrukcyjnej i niezawodności hydraulicznej sieci gazowej do obliczenia parametrów oceny niezawodności dostaw gazu, takich jak intensywność uszkodzeń rurociągu, redukcja przepływu gazu w sieci gazowej w różnych warunkach uszkodzeń, itp. Następnie, podano szczegółowe procedury obliczania tych parametrów w celu oceny niezawodności przesyłowej sieci gazowej pod kątem eksploatacyjnym i praktycznym. Na koniec, na przykładzie prostej sieci gazowej składającej się z dwóch pętli, opisano szczegółowy proces oceny niezawodności dostaw gazu w miejskiej sieci gazowej i zilustrowano możliwość wykorzystania proponowanej metody.
Źródło:
Eksploatacja i Niezawodność; 2018, 20, 3; 471-477
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Awarie w budynkach spowodowane błędnymi rozwiązaniami konstrukcyjnymi
Failures in building caused by incorrect construction solutions
Autorzy:
Wesołowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/161170.pdf
Data publikacji:
2017
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
awaria budynku
spękanie
przyczyna awarii
rozwiązanie konstrukcyjne
błąd projektowania
building failure
cracking
failure cause
structural solution
design error
Opis:
W pracy przedstawiono stany awaryjne dwóch budynków: mieszkalno-usługowego oraz mieszkalnego, w których doszło do niekontrolowanych zarysowań ścian wewnętrznych, skutkujących utrudnieniami eksploatacyjnymi dla użytkowników mieszkań. Przeprowadzona analiza wykazała, że w obydwu przypadkach doszło do poważnych błędów na etapie projektowania obiektów, gdzie dość pobieżnie i bezrefleksyjnie projektanci podeszli do analizy stanu granicznego użytkowalności w aspekcie ugięć stropów.
This thesis presents the emergency situations of two buildings: residential & commercial, and residential, where uncontrolled scratches of internal walls occurred, resulting in operational difficulties for the users of apartments. The analysis showed, that in both cases, there were serious errors in the design of the objects, where the designers in a sketchy and unreflective way, approached the serviceability limit state analysis in the aspect of deflection of the ceiling.
Źródło:
Przegląd Budowlany; 2017, 88, 6; 46-50
0033-2038
Pojawia się w:
Przegląd Budowlany
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kontrowersje wokół ekonomii w ochronie zdrowia i reformy systemu ochrony zdrowia
Controversy about Health Care Economics and Health Care Reforms
Разногласия относительно экономических аспектов здравоохранения и реформы системы здравоохранения
Autorzy:
Golinowska, Stanisława
Powiązania:
https://bibliotekanauki.pl/articles/1013272.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
health care
market failure
state failure
health care system reforms
здравоохранение
ненадежность рынка
ненадежность государства
реформы системы здравоохранения
Opis:
The article discusses the main dilemmas of the debate on the role of market and state in providing health care. The discussion is held in the context of the health reform package introduced in Poland in 2010-2011, which increased the share of private sector and commercial rules in health care institutions. The author recalls theoretical arguments about market and state failures in providing health services. She indicates the desirable directions of reforms in the health sector that would reduce the shortcomings of both extreme systems, introducing the arrangements that would combine the principles of solidarity, free choice, and individual responsibility. The author specifies the conditions, which have to be fulfilled in order to assure that changes introduced by reforms turn to be effective both in terms of social and economic criteria.
Статья содержит основные проблемы «вечной» дискуссии о роли рынка и государства в сфере здравоохранения со ссылкой на пакет законов о здравоохранении, принятых в Польше в 2010 – 2011 гг., согласно которым увеличивается доля частной собственности и коммерческих принципов в функционировании учреждений здравоохранения. Автор напоминает теоретические тезисы об ущербности рынка с одной стороны и ущербности государства в плане предоставления услуг в области здравоохранения, с другой. Говорит о направлениях реформ сектора здравоохранения, уменьшающих недостатки обеих крайних систем и внедряющих решения, соединяющие принципы солидаризма, свободы выбора и индивидуальной ответственности. Обращает внимание на необходимость выполнения определенных условий с тем, чтобы введенные изменения могли быть эффективными с точки зрения критериев здоровья, а также социальных и экономических критериев.
Źródło:
Ekonomista; 2013, 6; 771-794
0013-3205
2299-6184
Pojawia się w:
Ekonomista
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Niesprawność rynku, niesprawność rządu, przywództwo i polityka publiczna
Market Failure, Government Failure, Leadership and Public Policy
Autorzy:
Dollery, Brian F.
Wallis, Joe L.
Powiązania:
https://bibliotekanauki.pl/articles/904069.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Ekonomiczny w Krakowie, Małopolska Szkoła Administracji Publicznej
Tematy:
niesprawność rynku
niesprawność rządu
interwencja publiczna
przywództwo
polityka publiczna
market failure
government failure
government intervention
leadership and public policy
Opis:
Ekonomiczne uzasadnienie interwencji rządu w gospodarkę rynkową wynikało zwykle z teorii niesprawności rynku. Przedmiotem tego artykułu jest przedstawienie paradygmatu niesprawności rynku w sposób ujmowany w najnowszej literaturze poświęconej temu zagadnieniu. W teorii tej zakłada się, że kontraktualistyczne (contractualist) podejście do reformy służby publicznej to najlepsza metoda na poprawę produktywności sektora publicznego. Jednak my w niniejszym tekście postaramy się dowieść, że metoda ta nie pozwala dostrzec kluczowej, w naszym odczuciu, roli przywództwa w instytucjach publicznych i sposobów, dzięki którym zmiana charakteru przywództwa może wpływać na ich produktywność. Dowodzimy, że wspólnotowe koncepcje przywództwa mają także zastosowanie w ramach konwencjonalnego podejścia do gospodarki i mogą oddziaływać na kształtowanie polityki publicznej.
The economic rationale for government intervention in a market economy has traditionally been provided by the theory of market failure. This article reviews the market failure paradigm in the light of the more recent literature on government failure. One implication of the theory of government failure is that the contractualist approach to public service reform is the best method of improving public sector productivity. However, we argue that this view overlooks the potentially crucial role of leadership in public agencies and the ways in which transformational leadership can stimulate efficiency. We argue that communitarian conceptions of leadership can be incorporated into conventional economic approaches, and that this can have significant implications for public policy formulation.
Źródło:
Zarządzanie Publiczne / Public Governance; 2009, 2(8); 81-92
1898-3529
2658-1116
Pojawia się w:
Zarządzanie Publiczne / Public Governance
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and verification failures of a combustion engine injection system
Modelowanie i weryfikacja uszkodzen ukladu wtryskowego silnika spalinowego
Autorzy:
Dziubinski, M.
Czarnigowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/793621.pdf
Data publikacji:
2011
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
internal combustion engine
verification failure
modelling
idle speed
control
sensor failure simulation
toxic gas
fuel consumption
engine work stability
Opis:
Growing pressure to improve the performance of IC engines has resulted in development of improved control systems. These requirements, combined with the introduction of control algorithms that could only be simulated experimentally were the foundations of control-oriented modelling techniques. The paper presents the assumptions and requirements toward control oriented models and a model of an idling SI engine. Some results of identification and verification tests of the model are presented for the 1.5 GLI engine. On the basis of the engine model, the simulation of sensor failures had been carried out.
Rosnące wymagania stawiane silnikom spalinowym przyczyniają się do wprowadzania nowych systemów sterowania Wymagania te związane są z opracowaniem nowych algorytmów sterowania, które powinny być wyznaczane drogą eksperymentalną i w postaci modelowania. Artykuł przedstawia przyjęte założenia i wymagania dotyczące modelowania w aspekcie sterowania wolnych obrotów silnika. Wybrane badania identyfikacji i weryfikacji w postaci testów przeprowadzono dla modelu silnika 1.5 GLI. Na bazie modelu silnika przeprowadzono symulacje typowych uszkodzeń czujników.
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11C
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Common cause and load-sharing failures-based reliability analysis for parallel systems
Analiza niezawodności systemów równoległych w sytuacji jednocześnie występujących uszkodzeń wywołanych wspólną przyczyną oraz uszkodzeń elementów dzielących obciążenie
Autorzy:
Zhang, Chao
Zhang, Yunan
Powiązania:
https://bibliotekanauki.pl/articles/301836.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
system reliability
mean time to failure
common cause failure
load-sharing failure
parallel system
niezawodność systemu
średni czas do uszkodzenia
uszkodzenie wywołane wspólną przyczyną
uszkodzenie elementów dzielących obciążenie
system równoległy
Opis:
For parallel system reliability, the mean time to failure of parallel system under common cause failure (load-sharing failure) is shorter than that of the system without common cause failure (load-sharing failure). The traditional calculation approaches of mean time to failure of parallel systems do not consider the possible effect of common cause and load-sharing failure. However, it may result in the poor accuracy of mean time to failure of parallel system and pose a threat to system reliability. This paper not only considers the effect of common cause failure with stress strength, but also investigates the joint effect of the load-sharing and common cause failures. Besides, the joint failure model of three-dependent-component parallel system are established, and the corresponding properties are analyzed. Finally, a numerical example is used to illustrate the proposed method.
Gdy mowa o niezawodności systemu równoległego, średni czas do uszkodzenia, w przypadku uszkodzenia wywołanego wspólną przyczyną (lub uszkodzenia elementów dzielących obciążenie) jest krótszy niż dla systemu, w którym nie występują tego typu uszkodzenia. Tradycyjne metody obliczania średniego czasu do uszkodzenia systemów równoległych nie uwzględniają potencjalnego wpływu uszkodzeń wywołanych wspólną przyczyną oraz uszkodzeń komponentów dzielących obciążenie. Może to skutkować małą dokładnością tak obliczanego średniego czasu do uszkodzenia systemu równoległego i stanowić zagrożenie dla jego niezawodności. W prezentowanej pracy rozważano nie tylko wpływ uszkodzenia wywołanego wspólną przyczyną dla modelu typu wytrzymałość-obciążenie, ale również wpływ jednocześnie występujących uszkodzeń wywołanych wspólną przyczyną i uszkodzeń elementów dzielących obciążenie. Poza tym opracowano model, w którym omawiane dwa typy uszkodzeń występują jednocześnie w systemie równoległym składającym się z trzech zależnych elementów oraz przeanalizowano właściwości takiego systemu. W artykule przedstawiono przykład numeryczny, który ilustruje zastosowanie proponowanej metody.
Źródło:
Eksploatacja i Niezawodność; 2020, 22, 1; 26-34
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-100 z 936

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