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Wyświetlanie 1-15 z 934
Tytuł:
50 lat hodowli ziemniaka w Strzekecinie
Autorzy:
Pera, S
Powiązania:
https://bibliotekanauki.pl/articles/834766.pdf
Data publikacji:
2001
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
wies Strzekecino
hodowla roslin
hodowla zachowawcza
ziemniaki
historia
Strzekecino village
plant breeding
maintenance breeding
potato
history
Źródło:
Ziemniak Polski; 2001, 1; 38-40
1425-4263
Pojawia się w:
Ziemniak Polski
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparision of model and signal based condition monitoring and mode separation for predictive maintenance of feed drives
Autorzy:
Maier, D.
Heisel, U.
Powiązania:
https://bibliotekanauki.pl/articles/100055.pdf
Data publikacji:
2011
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
mode separation
condition monitoring
ball screw drive
predictive maintenance
Opis:
Modern production strategies increase the demand for closer monitoring of the machine's condition. Especially wear affects its condition. This paper deals with the methodology of condition monitoring that can be based on different sources of data such as controller NC CNC and additional sensors. Two main methods for assessment are signal analysis based exclusively on measurement data and a model based method The latter is based on comparing the simulation of the objects behaviour with the acquired data. Ball screw drives are key elements of machine tools. They considerably contribute to the machine's performance. The paper compares two signal-based wear inducing characteristics and discusses the results. Afterwards a model-based approach is discussed.
Źródło:
Journal of Machine Engineering; 2011, 11, 4; 138-151
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A concept of the predicting of technical state of devices
Autorzy:
Lemski, J.
Powiązania:
https://bibliotekanauki.pl/articles/962807.pdf
Data publikacji:
2004
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
technical state
prediction
maintenance
mathematical transformations
probability distributions
Opis:
The paper presents possibilities and limitations associated with technical state predicting procedure of devices, as well as it indicates the necessity of improving the present scheduling methods of preventive maintenance operations of ship power plant devices. It has been also showed that by making transformation of the wear rate distributions of device elements into the distributions of time of their correct- to-limit-state operation it is possible to predict their technical state and to suitably schedule their maintenance operations.
Źródło:
Polish Maritime Research; 2004, S 1; 67-72
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A conception of the modernisation of the chosen tramcars’ maintenance system
Koncepcja modernizacji systemu obsługiwania wybranych wagonów tramwajowych
Autorzy:
Smolik, M.
Heinrich, M.
Szybka, J.
Wiązania, G.
Powiązania:
https://bibliotekanauki.pl/articles/256490.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy
Tematy:
tramcar
maintenance process
failure analysis
reliability
improvement of maintenance system
wagon tramwajowy
proces eksploatacji
analiza uszkodzeń
niezawodność
poprawa systemu obsługiwania
Opis:
A procedure of the modernisation of the maintenance system of the tramcars used in public transport was presented in this paper. The analysis is based on the maintenance information stored in the database of a city transport company. General and seasonal changes of the number of failures are analysed as well as their reasons and consequences. The effects of the failures are counted proportionally to the financial loss that is characteristic for each of tramcar. Using reliability indexes is essential for the proper description of the failure frequency of the tramcars were presented. The analysis allows one to evaluate the quality of the available information about maintenance process. Therefore, it may lead to decisions about improving the data storage system. The whole procedure provides information that is useful in choosing possible and effective ways of improving the maintenance system which will consequently lead to a reduction of the number of tramcars' failures and a better utilisation of financial resources. The results of the analysis are useful during planning the times of maintenance work, the extents of regular servicing and the supply of spare parts as well as the possibilities of modernising the rolling stock.
W opracowaniu przedstawiono procedurę modernizacji systemu obsługiwania wagonów tramwajowych funkcjonujących w komunikacji miejskiej. Działania podejmowane są w oparciu o informację eksploatacyjną zgromadzoną w bazie danych przedsiębiorstwa transportowego. Przeprowadzona analiza oraz zaproponowana metodyka ocenowa uwzględniają koszty ponoszone przez przedsiębiorstwo. Przedstawione charakterystyki niezawodnościowe stanowią podstawę działań modernizacyjnych w zakresie systemu obsługiwania. Zaproponowana procedura pozwala na ocenę procesu obsługiwana oraz realizację zmian mających na celu poprawę niezawodności. Zmiany powinny również dotyczyć funkcjonującego w przedsiębiorstwie systemu informacyjnego.
Źródło:
Problemy Eksploatacji; 2013, 2; 209-219
1232-9312
Pojawia się w:
Problemy Eksploatacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A data driven decision making approach for long-wall mining production enhancement
Autorzy:
Morshedlou, A.
Dehghani, H.
Hoseinie, S. H.
Powiązania:
https://bibliotekanauki.pl/articles/88911.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
longwall system
reliability
maintenance
production risk
Opis:
Machine failures have destructive effects on continuity of operation and lead to production losses in long-wall mines, making proper maintenance scheduling essential. This paper models the reliability of the whole production chain in an Iranian long-wall mine including the drum shearer, Armored Face Conveyor (AFC), hydraulic powered supports, Beam Stage Loader (BSL), and main conveyer belt. Analyzing the computational results and failure frequencies, we rank the critical components and develop a reliability-based preventive maintenance schedule for all equipment. In respect to the data classification, conveyor belt with failure abundance of 41.5 percent is the most critical, while powered supports with the failure abundance of 1.2 percent shows the best performance. Approximately, the reliability of the production process after four hours reaches nearly to zero. Implementing the schedule, computational results suggest an increase of approximately 67.7 percent in the average production per shift.
Źródło:
Mining Science; 2019, 26; 7-20
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A data-driven predictive maintenance strategy based on accurate failure prognostics
Autorzy:
Chen, Chuang
Wang, Cunsong
Lu, Ningyun
Jiang, Bin
Xing, Yin
Powiązania:
https://bibliotekanauki.pl/articles/1841691.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
predictive maintenance
failure prognostics
performance degradation
maintenance cost
Opis:
Maintenance is fundamental to ensure the safety, reliability and availability of engineering systems, and predictive maintenance is the leading one in maintenance technology. This paper aims to develop a novel data-driven predictive maintenance strategy that can make appropriate maintenance decisions for repairable complex engineering systems. The proposed strategy includes degradation feature selection and degradation prognostic modeling modules to achieve accurate failure prognostics. For maintenance decision-making, the perfect time for taking maintenance activities is determined by evaluating the maintenance cost online that has taken into account of the failure prognostic results of performance degradation. The feasibility and effectiveness of the proposed strategy is confirmed using the NASA data set of aero-engines. Results show that the proposed strategy outperforms the two benchmark maintenance strategies: classical periodic maintenance and emerging dynamic predictive maintenance.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 2; 387-394
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Degradation-Threshold-Shock model for a system. The case of dependent causes of failure in finite-time
Autorzy:
Caballé, N. C.
Castro, I. T.
Powiązania:
https://bibliotekanauki.pl/articles/2069176.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:
condition-based maintenance
degradation-threshold-shock models
finite-time analysis
gamma process
Opis:
This paper deals with a condition-based maintenance strategy (CBM) in finite-time horizon for a system subject to two different causes of failure, internal degradation and sudden shocks. Internal degradation is modelled under a gamma process and sudden shocks arrive at the system following a non-homogeneous Poisson process (NHPP). Both causes of failure are considered as dependent. When a sudden shock takes places, the system fails. In addition, the system is regarded to fail when the deterioration level reaches a critical threshold. Under this functioning scheme, a CBM strategy is developed for controlling the reliability of the system. Traditionally, this strategy is developed under an asymptotic approach. Hence, considering an infinite-time horizon is not always possible. In this paper, we analyse a CBM strategy under a finite-time horizon developing a recursive method which estimates the expected cost rate based on numerical integration and Monte Carlo simulation. A numerical example is provided in order to illustrate this complex maintenance model.
Źródło:
Journal of Polish Safety and Reliability Association; 2016, 7, 1; 13--20
2084-5316
Pojawia się w:
Journal of Polish Safety and Reliability Association
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A finite element approach to develop track geometrical irregularity thresholds from the safety aspect
Autorzy:
Miri, A.
Mohammadzadeh, S.
Salek, H.
Powiązania:
https://bibliotekanauki.pl/articles/282067.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
maintenance and inspection
track geometry parameters
finite element
Adams/rail software
Opis:
Riding quality and safety of rail tracks are directly influenced by track geometry; hence, their degradation along time could reduce safety and cause serious accidents. Standards propose thresholds for track geometrical parameters to keep track safety and riding comfort at an acceptable level. In this study, a method is proposed to select or define a set of proper thresholds for geometrical parameter irregularities according to desirable to safety level. The impact of track geometry irregularities on the derailment index has been investigated through the finite element model. The results suggest that twist and gauge shortage have a greater effect on the derailment index compared to the vertical profile of the track. Having the critical values of geometrical irregularities that result in derailment, safety factors of Iranian and Euro code standards in determining their thresholds are calculated and compared. It is shown that each standard has a unique set of safety factors that depend on speed and geometrical parameters.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 695-705
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A fuzzy-TOPSIS model for maintenance outsourcing considering the quality of submitted tender documents
Autorzy:
Alshraideh, Maysa
Ababneh, Shereen
Gunay, Elif Elcin
Al-Araidah, Omar
Powiązania:
https://bibliotekanauki.pl/articles/2038237.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
contractor selection
maintenance outsourcing
MCDM
fuzzy TOPSIS
decision-making
Opis:
The paper provides a multiple-experts Fuzzy-TOPSIS decision-making model for the selection among maintenance contractors based on the quality of tendering documents. The study introduces a set of selection criteria utilizing benefit and cost criteria from literature. The proposed model aggregates subjective linguistic assessments of multiple experts that express their opinions on the degree of importance of criteria and allows multiple decisionmakers to evaluate the compliance of contractors’ documents. For a case study, the model is applied to select among contractors tendering to maintain the heavy-duty cranes of an international steel company from literature. Several decision-making scenarios are investigated, and major changes in the final decision are observed. The changes in obtained results illustrate the need to better address uncertainties in rating and tendering an overqualified contractor at a higher cost.
Źródło:
Eksploatacja i Niezawodność; 2021, 23, 3; 443-453
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A genetic algorithm and B&B algorithm for integrated production scheduling, preventiveand corrective maintenance to save energy
Autorzy:
Sadiqi, Assia
El Abbassi, Ikram
El Barkany, Abdellah
Darcherif, Moumen
El Biyaali, Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/1841396.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
scheduling
maintenance
genetic algorithm
branch
bound
MILP
modeling
optimization
CPLEX
Python
Opis:
The rapid global economic development of the world economy depends on the availability of substantial energy and resources, which is why in recent years a large share of non-renewable energy resources has attracted interest in energy control. In addition, inappropriate use of energy resources raises the serious problem of inadequate emissions of greenhouse effect gases, with major impact on the environment and climate. On the other hand, it is important to ensure efficient energy consumption in order to stimulate economic development and preserve the environment. As scheduling conflicts in the different workshops are closely associated with energy consumption. However, we find in the literature only a brief work strictly focused on two directions of research: the scheduling with PM and the scheduling with energy. Moreover, our objective is to combine both aspects and directions of in-depth research in a single machine. In this context, this article addresses the problem of integrated scheduling of production, preventive maintenance (PM) and corrective maintenance (CM) jobs in a single machine. The objective of this article is to minimize total energy consumption under the constraints of system robustness and stability. A common model for the integration of preventive maintenance (PM) in production scheduling is proposed, where the sequence of production tasks, as well as the preventive maintenance (PM) periods and the expected times for completion of the tasks are established simultaneously; this makes the theory put into practice more efficient. On the basis of the exact Branch and Bound method integrated on the CPLEX solver and the genetic algorithm (GA) solved in the Python software, the performance of the proposed integer binary mixed programming model is tested and evaluated. Indeed, after numerically experimenting with various parameters of the problem, the B&B algorithm works relatively satisfactorily and provides accurate results compared to the GA algorithm. A comparative study of the results proved that the model developed was sufficiently efficient.
Źródło:
Management and Production Engineering Review; 2020, 11, 4; 138-148
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Gloss in Approval of Judgment II KZP 17/18 issued by the Polish Supreme Court on 20 March 2019 r.
Autorzy:
Rosiak, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/45662212.pdf
Data publikacji:
2023-11-13
Wydawca:
Akademia Policji w Szczytnie
Tematy:
criminal law
recidivation
the offence of child maintenance evasion
criminal sanction
amendment
Opis:
The voted ruling of the Supreme Court concerns the issues related to the entry into force of the law of 23 March 2017. The Supreme Judicial Authority in Poland indicated that to assess the act of a person obligated to alimony, whose obligation was determined in terms of the amount by a court decision, a settlement concluded before a court or another authority or another agreement, and committed before 31 May 2017, it is possible to apply the provisions of Article 209 of the Code of Criminal Procedure, both in its current and current wording. The condition is to establish that the perpetrator has exhausted the features of the offence of non-alimination required by the current wording of this provision, and at the same time has fulfilled the features required for this offence in the wording given to this amendment. In such a situation, after such a double assessment of the act, the procedural authority will either apply the new act or the act previously in force as being more relative to the offender.
Źródło:
Przegląd Policyjny; 2023, 151(3); 378-386
0867-5708
Pojawia się w:
Przegląd Policyjny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Gloss to the Judgment of the Appellate Court in Warsaw of 28 May 2013 (VI Aca 785/13)
Autorzy:
Witczak, Hanna
Powiązania:
https://bibliotekanauki.pl/articles/2129148.pdf
Data publikacji:
2022-09-09
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II
Tematy:
unworthiness to inherit
offence of persistent avoidance of the duty of maintenance
offence of abandonment
pardon
Opis:
In the glossed judgement, the Appellate Court examined the possibility of declaring the respondent unworthy of succession should he have committed the offence of avoidance of the duty of maintenance of the testator (Article 209 PC) or the offence of abandonment of the testator (Article 210 PC). The court’s considerations were purely hypothetical, as in the course of the proceedings, it was not proven whether the heir had actually committed these offences. The court allowed the recognition of the heir as unworthy if he had committed the offence of persistent avoidance of the duty of maintenance, but only if it could be proven. The court’s position raises certain doubts. Any conduct that violates familial nexus, in particular, should be verified for the existence of grounds for exclusion from succession, since this bond, in the legal sense, has its source in the relationship of marriage, consanguinity, and affinity, and these determine the legal title to inheritance. In particular, it is not understandable why persistent failure to fulfil family obligations, even if it is not an offence that a civil tribunal could additionally qualify as serious, does not actually produce legal consequences for the parent if the other party to the family relationship is a minor. It seems that wherever we are confronted with malicious and intentional failure to perform family duties, it should be assumed, provided that the statutory criteria of this specific type of offence are met, that in abstracto a serious offence has taken place.
Źródło:
Review of European and Comparative Law; 2022, 50, 3; 239-258
2545-384X
Pojawia się w:
Review of European and Comparative Law
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Maintenance Maturity and Sustainability Assessment Model for Manufacturing Systems
Autorzy:
Franciosi, Chiara
Tortora, Alessia Maria Rosaria
Miranda, Salvatore
Powiązania:
https://bibliotekanauki.pl/articles/2201187.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
maintenance
sustainability
maintenance impact
manufacturing system
maintenance performance measurement
Opis:
Maintenance is a key manufacturing function that contributes to a company’s productivity, profitability and sustainability. Unfortunately, many aspects of the contribution of maintenance to sustainability in manufacturing remain unexplored, and many enterprises are not yet ready to assess the maintenance impacts on their sustainability. Maturity models are useful tools for assessing maintenance practices; however, no maintenance maturity model that allows the evaluation of the contribution of maintenance to sustainable performance was found in literature. This paper proposes a model for assessing the maturity and sustainability of maintenance processes. The model outputs are: a measure of the maintenance and sustainability maturity level; recommendations for improvement to undertake to enhance maintenance maturity and, thus, meet sustainability standards. The model was applied in three manufacturing enterprises: the calculation of their maintenance maturity and sustainability indices made the maintenance stakeholders more aware of the need to implement effective strategies for more sustainable maintenance performance.
Źródło:
Management and Production Engineering Review; 2023, 14, 1; 137--155
2080-8208
2082-1344
Pojawia się w:
Management and Production Engineering Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Maintenance of a Dominant Market Position – on the Example of the Polish Post Office
Autorzy:
Bernat, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/517423.pdf
Data publikacji:
2014
Wydawca:
Instytut Badań Gospodarczych
Tematy:
dominant position
antitrust law
maintenance of dominant position
allocative inefficiency
Opis:
The system changes of the Polish economy, which began in the 80s of the 20th century and were continued after the accession to the European Union in 2004, have caused significant transformations, not only in the economy and ownership relations, but also in single markets. What is more, some of the European Commission’s guidelines have introduced the market regulations which were dominated by natural monopolies. These changes were to cause the competitiveness on the market and to improve its functioning in an efficiency allocative sense in order to make the consumers’ situation better. However, it is often a kind of struggle without any visible effects in short or long term. One of such examples is the Polish Post Office as the national operator in the market of postal services. The scientific objective of this study is to answer the question whether the changes in the law regulating the postal market cause real changes in the market structure, resulting in a reduction in allocative inefficiency? The working hypothesis referring to such research problem is formulated as follows: large business entities operating in the monopolistic market structure until now use all of the tools – including changes in the law, to maintain their position. It causes an increase in allocative inefficiency of companies and market. The object of the research is Poczta Polska SA. The primary research method will be based on the analysis of the legal rules, the analysis of the activities and entities’ decisions and the comparative analysis. The active research is supported by the literature recognition.
Źródło:
Equilibrium. Quarterly Journal of Economics and Economic Policy; 2014, 9, 4; 9-20
1689-765X
2353-3293
Pojawia się w:
Equilibrium. Quarterly Journal of Economics and Economic Policy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A method for obtaining the preventive maintenance interval in the absence of failure time data
Autorzy:
Sánchez-Herguedas, Antonio
Mena-Nieto, Ángel
Rodrigo-Muñoz, Francisco
Powiązania:
https://bibliotekanauki.pl/articles/2175137.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
ship maintenance
preventive interval
maintenance model
semi-Markovian process
incomplete data
Weibull function
maintenance costs
Opis:
One of the ways to reduce greenhouse gas emissions and other polluting gases caused by ships is to improve their maintenance operations through their life cycle. The maintenance manager usually does not modify the preventive intervals that the equipment manufacturer has designed to reduce the failure. Conditions of use and maintenance often change from design conditions. In these cases, continuing using the manufacturer's preventive intervals can lead to non-optimal management situations. This article proposes a new method to calculate the preventive interval when the hours of failure of the assets are unavailable. Two scenarios were created to test the effectiveness and usefulness of this new method, one without the failure hours and the other with the failure hours corresponding to a bypass valve installed in the engine of a maritime transport surveillance vessel. In an easy and fast way, the proposed method allows the maintenance manager to calculate the preventive interval of equipment that does not have installed an instrument for measuring operating hours installed.
Źródło:
Eksploatacja i Niezawodność; 2022, 24, 3; 564--573
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 934

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