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Tytuł:
The assessment of changes in the microstructure of a gas turbine blade with a non - destructive thermographic method
Autorzy:
Kułaszka, A.
Błachnio, J.
Zasada, D.
Jóźwik, P.
Powiązania:
https://bibliotekanauki.pl/articles/246861.pdf
Data publikacji:
2012
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
gas turbine
blade
pulsed thermography diagnosing
health/maintenance status
Opis:
Diagnostic methods applied nowadays to examine condition of a gas turbine blade have been discussed in the Introduction section. What follows in the body of the paper is presentation of findings on the assessment of changes in the microstructure of a gas turbine blade with a non-destructive thermographic method. A laboratory experiment performed on new turbine rotor blades made of the EI 867WD alloy has been described. The experiment consisted in holding the blades at different temperatures in the exhaust-gas environment produced by an aircraft engine supplied with jet fuel. The pulsed thermography method has been used to determine and analyse the temperature distribution upon the examined area while cooling-down after the earlier uniform warming it up with a heat pulse. Diffusion and effusion of heat in the alloy have been examined. Both phenomena are determined with thermal properties and other physical properties such as size, shape, weight, structure, chemical composition, thickness of the protective coating of the blade. Examination of the microstructure of the blade material has shown the increased thickness of the coating, grain size, and in particular disadvantageous modification in the strengthening gamma' phase against temperature. Finding the relationship between parameters of thermal responses of blade materials to heat pulse against the average size of precipitates of the gamma' phase and thickness of the aluminium protective coating enables inferences on changes in the blade material's condition. With this relationship as the basis and knowing permissible changes to the microstructure one can determine the 'fit-for-use' and 'unfit-for-use' (i.e. serviceable and unserviceable) conditions of the blades. Assuming the material criterion, i.e. some disadvantageous change in the morphology of precipitates of the gamma' phase in the EI 867WD alloy under examination, the 'fit-for-use' (serviceability) thresholds for blades affected with different temperatures have been defined.
Źródło:
Journal of KONES; 2012, 19, 2; 271-281
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oral cavity status of long-term hemodialized patients vs. their socio-economic status
Autorzy:
Trzcionka, Agata
Twardawa, Henryk
Mocny-Pachońska, Katarzyna
Tanasiewicz, Marta
Powiązania:
https://bibliotekanauki.pl/articles/2085564.pdf
Data publikacji:
2020-05-15
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
chronic diseases
socio-economic status
end-stage chronic kidney disease
oral health
hemodialysis
health maintenance
Opis:
BackgroundThe chronic kidney disease, blood hypertension and diabetes are recognized as civilization diseases that affect more and more people. The probability of encountering a patient suffering from these diseases is increasing. As such, it appears crucial to better understand the specific dental needs of such groups of patients. The aim of the work was to assess the oral hygiene status and the needs of patients suffering from the end-stage chronic kidney disease, arterial hypertension or/and diabetes.Material and MethodsTwo hundred and twenty eight patients were included in the research. One hundred and eighty patients were hemodialized in Diaverum dialysis stations and 48 patients were from the Conservative Dentistry with Endodontics Clinic of the Academic Centre of Dentistry in Bytom, Silesian Medical University in Katowice, and from the Dentistry Division of the Arnika Clinic in Zabrze, and were not not diagnosed with any of the diseases mentioned. The research scheme was divided into 3 parts, consisting of an analysis of the general health socio-economic status, a survey and an assessment of oral health.ResultsThe patients who were not suffering from any of the discussed diseases were more aware of how to properly perform hygienic procedures. Most of the patients from both the control and examined groups were not using any rinsing solutions. A higher percentage of patients in the control group was using dental floss, changing their toothbrush every 3 months and brushing their teeth for ≥2 min. The Aproximal Plaque Index and the Oral Hygiene Index-Simplified values in the control group were significantly lower in comparison to the examined group.ConclusionsThe socio-economic status of hemodialized patients was low, which in most cases was a result of the difficulties in starting a job. Due to the lower standards of life, the neglect of oral hygiene maintenance and its consequences could be observed.
Źródło:
Medycyna Pracy; 2020, 71, 3; 279-288
0465-5893
2353-1339
Pojawia się w:
Medycyna Pracy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-uniformity of the combustor exit flow temperature in front of the gas turbine
Autorzy:
Błachnio, J.
Pawlak, W.
Powiązania:
https://bibliotekanauki.pl/articles/386460.pdf
Data publikacji:
2014
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
gas turbine
blade
simulation model
working agent temperature field
health/maintenance status
turbina gazowa
łopatka turbiny
model symulacyjny
warunki techniczne
Opis:
Various types of damages to gas-turbine components, in particular to turbine blades, may occur in the course of gas turbine operation. The paper has been intended to discuss different forms of damages to the blades due to non-uniformity of the exit flow temperature. It has been shown that the overheating of blade material and thermal fatigue are the most common reasons for these damages. The paper presents results from numerical experiments with use of the computer model of the aero jet engine designed for simulations. The model has been purposefully modified to take account of the assumed non-homogeneity of the temperature field within the working agent at the turbine intake. It turned out that such non-homogeneity substantially affects dynamic and static properties of the engine considered as an object of control since it leads to a lag of the acceleration time and to increase in fuel consumption. The summarized simulation results demonstrate that the foregoing properties of a jet engine are subject to considerable deterioration in pace with gradual increase of the assumed non-homogeneity of the temperature field. The simulations made it possible to find out that variations of the temperature field nonhomogeneity within the working agent at the turbine intake lead to huge fluctuation of the turbine rpm for the idle run.
Źródło:
Acta Mechanica et Automatica; 2014, 8, 4; 209-213
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ubezpieczenia społeczne pracowników miejskich Zarządu miasta Lublina w latach 1918-1939
Social Insurance for Municipal Employees of the Lublin City Council in Years 1918-1939
Autorzy:
Szewczak-Daniel, Mariola
Powiązania:
https://bibliotekanauki.pl/articles/1754554.pdf
Data publikacji:
2020-06-15
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
Tematy:
Magistrat miasta Lublina
ubezpieczenie emerytalne
ubezpieczenie chorobowe
pomoc lekarska
Kasa Chorych
the Lublin city municipality
retirement pension insurance
health insurance
medical
assistance
Health Maintenance Organisation
Opis:
Na ziemiach polskich po odzyskaniu niepodległości istniały różne systemy prawne odziedziczone po zaborcach. Odmienny stan prawny obowiązywał także w dziedzinie ubezpieczeń społecznych. Stworzenie jednolitego systemu ubezpieczeń społecznych w odradzającym się państwie było bardzo trudnym zadaniem. Należało bowiem nie tylko ujednolicić ustawodawstwo pozaborcze, ale przede wszystkim dostosować je do warunków społeczno-politycznych niepodległego kraju. Ujednolicenie zasad ubezpieczeń społecznych nastąpiło za sprawą wejścia w życie ustawy z dnia 28 marca 1933 r. o ubezpieczeniu społecznym, zwanej powszechnie „ustawą scaleniową”. Analiza zasad ubezpieczania pracowników samorządowych międzywojennego Lublina pokazuje, że mimo uchwalenia jednolitych norm prawnych w zakresie ubezpieczeń społecznych, samorządy terytorialne, a właściwie organy samorządowe, na mocy obowiązujących przepisów miały prawo samookreślania warunków uzyskiwania świadczeń pomocy lekarskiej oraz zabezpieczenia emerytalnego w drodze wydawanych statutów wewnętrznych, co prowadziło do swoistego rodzaju partykularyzmu prawnego systemu ubezpieczeń pracowniczych.
After Poland regained independence, it operated within various legal systems inherited from the partitioning states. A different legal status was also in force in the field of social security. Establishing a unified social security system in a recovering state was a very difficult task. It was necessary not only to standardize post-partition legislation, but above all, to adapt it to the socio-political conditions of an independent country. The unification of social security rules took place due to the entry into force of the Act on social insurance of 28 March 1933, commonly referred to as “the merger act”. The analysis of the principles of insuring municipal employees of the interwar Lublin reveals that, despite the adoption of uniform legal standards in the field of social security, local governments, or rather local government bodies, had the right under the applicable provisions to self-determine the conditions for obtaining medical assistance and retirement insurance by issuing internal statutes, which led to a kind of particularism of the legal employee insurance system.
Źródło:
Roczniki Nauk Prawnych; 2020, 29, 4; 99-114
1507-7896
2544-5227
Pojawia się w:
Roczniki Nauk Prawnych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Prescriptive Exercise Program for Health Maintenance
Autorzy:
Yamashita, A.
Kawakami, M.
Inagaki, Y.
Ohkubo, T.
Powiązania:
https://bibliotekanauki.pl/articles/89896.pdf
Data publikacji:
2001
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
health maintenance
prescriptive exercise program
aging society
heart rate
relative metabolic rate
myoelectric potential
starsi pracownicy
fizjologia
praca mięśni
wydolność
zdolność fizyczna
metabolizm
Opis:
The aim of this study was to design a prescriptive exercise program for people of various age and fitness basing on the popular in Japan Radio Physical Fitness Exercise, a program based on an experimental approach. The evaluation indices used in the experiment were heart rate (HR), oxygen consumption, and electrical activity of the rectus femoris, latissimus dorsi, and trapezius muscles, which measured during various motion elements of the program performed at various rate. The results of this study enable to calculate equations for predicting HR during exercise from relative metabolic rate (RMR). The data on HR, RMR, and myoelectric potential presented in this study may be a basis for designing individual exercise programs for elderly people.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2001, 7, 2; 195-209
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Socjologia praw pacjenta – wybrane uwagi, analizy i refleksje
Sociology of patients’ rights: selected remarks, analysis and reflection
Autorzy:
Kmieciak, Błażej
Powiązania:
https://bibliotekanauki.pl/articles/685877.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
prawa pacjenta
prawo medyczne
socjologia prawa
godność człowieka
instytucja ochrony zdrowia
patients’ rights
medical law
sociology of law
human dignity
health maintenance organization
Opis:
The legal situation of the patient has become one of the most important elements of the debate on health care. It is related to the specific situation. The patient during a meeting with a medical expert is forced to provide intimate details about his life. Patients’ rights are most often analysed in legal terms relating to specific laws or regulations. It should be noted, however, that these rights of patients “live” primarily in institutions such as hospitals or clinics. Moreover, they are not only a part of the broadly understood system of medical law. They refer to a specific meeting that occurs between the patient and the medical expert. How can the mentioned relationship be applied to the concept of patients’ rights? Are there any laws that specifically relate to the interaction which occurs between the doctor and the patient? Is the formal implementation of the regulations sufficient to conclude that patients’ rights are fully respected? The proposed article is an attempt to answer these questions.
Sytuacja prawna pacjenta stała się jednym z kluczowych elementów debaty na temat ochrony zdrowia. Odnosi się ona do szczególnej sytuacji. Pacjent w trakcie spotkania z ekspertem medycznym zmuszony jest często do przedstawienia intymnych informacji dotyczących swojego życia. Prawa pacjenta najczęściej analizowane są pod kątem legalnym, w aspekcie konkretnych ustaw lub rozporządzeń. Warto jednak zaznaczyć, że wspomniane uprawnienia pacjentów „żyją” przede wszystkim na terenie instytucji, takich jak szpitale czy poradnie. Ponadto, nie są one wyłącznie elementem szeroko rozumianego systemu prawa medycznego. Odwołują się do konkretnego spotkania, do jakiego dochodzi pomiędzy pacjentem a ekspertem medycznym. W jaki sposób, wspomnianą relację można odnieść do pojęcia praw pacjenta? Czy istnieją prawa, które w sposób szczególny dotyczą interakcji, do której dochodzi pomiędzy lekarzem a pacjentem? Czy formalna realizacja przepisów wystarczy, by uznać, iż dane prawa są w pełni respektowane? W prezentowanym artykule podjęta zostanie próba udzielenia odpowiedzi na te pytania.
Źródło:
Acta Universitatis Lodziensis. Folia Iuridica; 2017, 79
0208-6069
2450-2782
Pojawia się w:
Acta Universitatis Lodziensis. Folia Iuridica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of maintenance system on the selected aspects of dairy cattle health
Wpływ systemu utrzymania na wybrane aspekty zdrowotności bydła mlecznego
Autorzy:
Gaworski, M.
Kowalska, M.
Powiązania:
https://bibliotekanauki.pl/articles/56383.pdf
Data publikacji:
2013
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
maintenance system
dairy cattle
animal health
health
Opis:
There are presented the results of investigations on the effect of dairy cattle maintenance system on the animal health and welfare. The paper is mainly focused on observations on the effect of cowshed bedding on animals' physiological state. Methodic of investigations was based on observing the cow herd in four farms during eight months. The animal maintenance technologies in these farms were different. Prior to investigations, the breeders were interviewed in respect of technical parameters in the buildings for livestock. The results of investigations proved that maintenance system, type of bedding and technical parameters of the livestock building influenced evaluation of cattle health and potential hazards expressed by injuries.
Wpływ systemu utrzymania na wybrane aspekty zdrowotności bydła mlecznego. Celem pracy była ocena wpływu systemu utrzymania bydła mlecznego na stan zdrowia oraz dobrostan zwierząt. W pracy skupiono się głównie na obserwacji wpływu podłoża w oborze na stan fizjologiczny zwierząt. Metodyka badań opierała się na obserwacji stad krów w 4 gospodarstwach przez okres ośmiu miesięcy. Technologie utrzymania zwierząt w tych gospodarstwach były zróżnicowane. Przed przystąpieniem do badań przeprowadzono wywiady z hodowcami na temat parametrów technicznych budynków inwentarskich. Wyniki badań potwierdziły, że zarówno system utrzymania, rodzaj podłoża, jak i parametry techniczne budynku inwentarskiego wykazują wpływ na ocenę zdrowotności bydła i potencjalne zagrożenia wyrażane urazami ciała.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Agriculture; 2013, 62 Agric.Forest Eng.
0208-5712
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Agriculture
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Machine tool ability representation: a review
Autorzy:
Sadasivam, L.
Archenti, A.
Sandberg, U.
Powiązania:
https://bibliotekanauki.pl/articles/99804.pdf
Data publikacji:
2018
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
machine tool
ability
health
predictive maintenance
accuracy
Opis:
Smart manufacturing and predictive maintenance are current trends in the manufacturing industry. However, the holistic understanding of the machine tool health condition in terms of accuracy, functions, process and availability is still unclear. This uncertainty renders the development of models and the data acquisition related to machine tool health condition ineffective. This paper proposes the term machine tool ability as an interconnection between the accuracy, functions, the process and the availability to overcome the lack of the holistic understanding of the machine tool. This will facilitate the further development of qualitative or quantitative methods as well as models. The research highlights the challenges and gaps to understand the machine tool ability.
Źródło:
Journal of Machine Engineering; 2018, 18, 2; 5-16
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hazard of chemical substances contamination of protective clothing for firefighters – a survey on use and maintenance
Autorzy:
Krzemińska, Sylwia M.
Szewczyńska, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/2084884.pdf
Data publikacji:
2022-04-11
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
questionnaire
firefighters
health hazard
protective clothing
maintenance
chemical contamination
Opis:
ObjectivesThe objective of the work was to analyze the impact of selected factors concerning the use and maintenance of firefighters’ protective clothing worn during rescue operations on the hazard of contamination by chemical substances.Material and MethodsThe participants were firefighters (N = 688) from rescue and firefighting units of the State Fire Service in Poland, aged <30, 31–40, 41–50 or >60 years, with different seniority: up to >21 years of service. The survey questionnaire developed by the authors was used. The questionnaire was available online. The Statistica 10.0 statistical package using the χ2 test was applied in the analysis of the significance of the results.ResultsAs reported by the vast majority (>60%) of the firefighters, the maintenance was carried out after recording an average or a high level of contamination. It was pointed out that removal of the contaminants from protective clothing was difficult (83%). The surfaces of the legs and sleeves of protective clothing were the most contaminated areas. A feeling of discomfort was observed (90%) after returning from firefighting operations due to fire, smoke, or combustion residues.ConclusionsIt is necessary to conduct training and information actions concerning the use and maintenance of protective clothing and the harmfulness of chemicals contaminating the garments used by firefighters.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2022, 35, 2; 235-248
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Haul road roughness measurement using georeferenced truck vibration
Autorzy:
Douglas, Alexander
Powiązania:
https://bibliotekanauki.pl/articles/2064370.pdf
Data publikacji:
2019
Wydawca:
STE GROUP
Tematy:
haul road
vibration
operator health
road maintenance
Big Data
warunki drogowe
wibracja
nierówności drogi
roboty drogowe
Opis:
Vehicle vibrations caused by poor haul road conditions create multiple negative effects for mines, including slower cycle times, increased maintenance, and operator injury. Vibration levels in vehicles result in part from road roughness. Mine roads are mainly constructed from in-pit materials that are more likely to deteriorate overtime and require frequent maintenance to maintain a smooth surface. The decision for when and where road maintenance is conducted is primarily based on visual inspections. This method can provide subjective, inaccurate, and delayed response to adverse conditions. The recent increase in vehicle telemetry data allows instant access to several types of data; mainly being used for haul fleet dispatching, collision avoidance, and geologic surveying, telemetry data has yet to see widespread use in road maintenance dispatching. This paper examines current road roughness characterization techniques and current telemetry data streams. An initial case study was conducted using vibration and Global Navigation Satellite System (GNSS) telemetry data to determine road roughness. Data from three haul trucks under normal operating conditions were collected over the course of a week. The results of this case study demonstrate localized vibration levels can be used to objectively identify rough roads. This can be further developed to dispatch road maintenance crews leading to overall reduced mining costs and increased operator health. The researches propose continuing to full scale test using data from an entire fleet and longer timeframe.
Źródło:
New Trends in Production Engineering; 2019, 2, 1; 416--423
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 13

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