Temat: lifetime - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Implementation of mathematical model of thermal behavior of electronic components for lifetime estimation based on multi-level simulation
Autorzy:: Frivaldsky, M.
Pridala, M.
Drgona, P.
Powiązania:: https://bibliotekanauki.pl/articles/140808.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: electrolytic capacitor
lifetime model
lifetime estimation
system-level simulation
Opis:: The main purpose of the paper is the proposal of multi-level simulation, suited for the evaluation of the lifetime of critical electronic devices (electrolytic capacitors). The aim of this issue is to imagine about the expected operation of complex and expensive power electronic systems, when the failure of the most critical component occurs. For that reason, various operational conditions and various physical influences must be considered (e.g. mechanical, humidity, electrical, heat stress), where nonlinearities are naturally introduced. Verification of the proposal is given, whereby the life-time estimation of an electrolytic capacitor operated in a DC-DC converter during various operational conditions is shown. At this point electrical and heat stress is considered for lifetime influence. First, the current state in the field of mathematical modeling of the lifetime for electrolytic capacitors, considering main phenomena is introduced. Next, individual sub-models for multi-level simulation purposes are developed, including a thermal simulation model and electrical simulation model. Several complexities of individual models are mutually compared in order to evaluate their accuracy and suitability for further use. Proper simulation tools have been mutually linked and data transfer was secured, in order to have the possibility of investigation of a lifetime depend on the changes of various variables.
Źródło:: Archives of Electrical Engineering; 2017, 66, 2; 339-350
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Numerical investigation of creep behaviour of high-temperature steam turbine compone
Autorzy:: Banaszkiewicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/175375.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: creep
lifetime assessment
steam turbine
Opis:: The paper presents a model for creep basing on the so-called characteristic creep strain. It illustrates its application in computations of old steam turbines components. The presented model is a modification of the Norton model which relates the stress exponent to the creep rupture strength and current stress. Creep strain is a function of the above two quantities, i.e., rupture strength and current stress, and acharacteristic creep strain which is material constant for a given time and temperature. Computational examples regard the rotating and pressure components analysed using the finite element method.
Źródło:: Transactions of the Institute of Fluid-Flow Machinery; 2012, 124; 5-15
0079-3205
Pojawia się w:: Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Methodology of threat autonomous assessment and forecasting the lifetime of the marine structure
Autorzy:: Murawski, L.
Powiązania:: https://bibliotekanauki.pl/articles/245864.pdf
Data publikacji:: 2015
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: monitoring systems
non-destructive tests
ship structures lifetime prediction
damage identification
damage localization
lifetime forecasting
Opis:: Structural Health Monitoring (SHM) is a natural extension and supplement of Non-Distractive Tests (NDT). Structure assessment during periodical NDT tests is performed by highly trained human team. However, during long sea voyage, ship crew has no knowledge and possibility for detailed assessment and, what is more, has no knowledge lifetime predicting of ship structure. SHM systems should have good designed sensors types, distribution, and automatic recording unit. However, most important (and most difficult for designing) is autonomous and self-contained procedures for marine structures hazard assessment. In the paper, basic assumptions for numerical algorithms of signal processing, damage identification and localization, threat assessment and forecasting of structure lifetime are presented. SHM systems can be based on several different measurements techniques like: comparative vacuum monitoring, electromagnetic layer, Lamb waves, vibration based methods, acoustic emission, and fibre optics. Last three methods are most promising in the marine environment, according to the author experience. Global ship hull deformation should be monitored as quasi-continuous measurements. Optical Time-Domain Reflectometer method (OTDR) is planned by author for hull global deformation monitoring. Some local strain-stress concentration of hull structure and propulsion system bearings' reactions will be monitored by Fibre Bragg Grating (FBG) sensors. Both techniques (OTDR and FBG) have been shortly described in the paper.
Źródło:: Journal of KONES; 2015, 22, 2; 163-168
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The method of estimating lifetimes of aircraft devices operating under ageing-attributable wearing conditions
Autorzy:: Ważny, M.
Powiązania:: https://bibliotekanauki.pl/articles/281271.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: reliability
lifetime
destructive processes
permissible condition
Opis:: The paper presents a probabilistic method of assessing lifetimes of selected structural components or assemblies of devices/systems affected by destructive processes that occur during aircraft operation. Reliability status of the device is evaluated by means of diagnostic or operational parameters. It is assumed that these devices (systems, assemblies) operate reliably if effects of wear and tear processes described by diagnostic parameters do not exceed boundary conditions/regimes. From the mathematical aspect, the method has been based on difference equations from which, when rearranged, a partial differential equation of the Fokker-Planck type is derived. A density function of the component wearing is a particular solution to this equation. With the density function of the component wearing applied, after suitable rearrangements, one can determine a density function of time for the exceeding the boundary condition. Now, with the density function of time of reaching the boundary condition found, and after rearrangement of this function, one receives dependences that can be applied to determine lifetime of the device given consideration. An example at the end of the paper illustrates how this method can be applied to analyse an airborne sighting system.
Źródło:: Journal of Theoretical and Applied Mechanics; 2015, 53, 4; 981-990
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Resonance production in heavy ion collisions
Autorzy:: Markert, Ch.
Powiązania:: https://bibliotekanauki.pl/articles/146392.pdf
Data publikacji:: 2004
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: resonance
strangeness
baryon
freeze-out
lifetime
fireball
Opis:: Resonances and their decay products may interact strongly with the hadrons in the fireball medium from the time of chemical freeze-out until the system breaks up at kinetic freeze-out. In order to try to further our understanding of the evolution and expansion of this hot and dense medium we compare resonance particle yields and spectra from elementary p+p and heavy ion collisions.
Źródło:: Nukleonika; 2004, 49,suppl.2; 119-123
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: A model for service life control of selected device systems
Autorzy:: Zieja, M.
Ważny, M.
Powiązania:: https://bibliotekanauki.pl/articles/259281.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: reliability
unreliability
durability
service lifetime
destructive processes
Opis:: This paper presents a way of determining distribution of limit state exceedence time by a diagnostic parameter which determines accuracy of maintaining zero state. For calculations it was assumed that the diagnostic parameter is deviation from nominal value (zero state). Change of deviation value occurs as a result of destructive processes which occur during service. For estimation of deviation increasing rate in probabilistic sense, was used a difference equation from which, after transformation, Fokker-Planck differential equation was obtained [4, 11]. A particular solution of the equation is deviation increasing rate density function which was used for determining exceedance probability of limit state. The so-determined probability was then used to determine density function of limit state exceedance time, by increasing deviation. Having at disposal the density function of limit state exceedance time one determined service life of a system of maladjustment. In the end, a numerical example based on operational data of selected aircraft [weapon] sights was presented. The elaborated method can be also applied to determining residual life of shipboard devices whose technical state is determined on the basis of analysis of values of diagnostic parameters.
Źródło:: Polish Maritime Research; 2014, 2; 45-49
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: A Survey of Multi-Objective Deployment in Wireless Sensor Networks
Autorzy:: Marks, M.
Powiązania:: https://bibliotekanauki.pl/articles/308483.pdf
Data publikacji:: 2010
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: coverage
lifetime
placement
positioning
wireless sensor network
Opis:: The major challenge in designing wireless sensor networks (WSNs) is to find tradeoff between the desired and contrary requirements for the lifetime, coverage or cost while coping with the computation, energy and communication constraints. This paper examines the optimal placement of nodes for a WSN. It is impossible to consider the deployment of the nodes separately from WSNs applications. We highlight the properties of WSNs applications that determine the placement problem. We identify and enumerate the various objectives that should be considered. The paper provides an overview and concentrates on multi-objective strategies, their assumptions, optimization problem formulation and results.
Źródło:: Journal of Telecommunications and Information Technology; 2010, 3; 36-41
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Fluorescence decay time distribution analysis of cyclic enkephalin analogues; Influence of solvent and Leu configuration in position 5 on conformation
Autorzy:: Malicka, Joanna
Ganzynkowicz, Robert
Groth, Małgorzata
Czaplewski, Cezary
Karolczak, Jerzy
Liwo, Adam
Wiczk, Wiesław
Powiązania:: https://bibliotekanauki.pl/articles/1044169.pdf
Data publikacji:: 2001
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: lifetime distribution
fluorescence
energy transfer
conformation
enkephalin
Opis:: Lifetime distribution analysis were performed to study the influence of Leu configuration in position 5 on changes of the peptide chain of cyclic analogues of enkephalins containing a fluorescence donor and acceptor in different solvents. The configuration change of Leu5 in all the analogues of enkephalins studied which contain donor-acceptor pairs has no apparent influence on Trp lifetime distributions. In contrast, there is a significant solvent effect on the shape of lifetime distribution.
Źródło:: Acta Biochimica Polonica; 2001, 48, 1; 95-102
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Methods and algorithms for evaluating unknown parameters of components reliability of complex technical systems
Autorzy:: Kołowrocki, K.
Soszyńska, J.
Powiązania:: https://bibliotekanauki.pl/articles/2069673.pdf
Data publikacji:: 2009
Wydawca:: Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
Tematy:: reliability
safety
lifetime
distribution
estimation
maritime transport
Opis:: The paper objectives are to present the methods and tools useful in the statistical identifying the unknown parameters of the components reliability and safety of complex industrial systems and to apply them in the maritime industry. There are presented statistical methods of estimating the unknown intensities of departure from the reliability state subsets of the exponential distribution of the component lifetimes of the multistate systems operating in various operation states. The goodness-of-fit method applied to testing the hypotheses concerned with the exponential form of the multistate reliability function of the particular components of the complex technical system in variable operations conditions is suggested. An application of these tools to reliability characteristics of a ferry operating at the Baltic Sea waters is presented as well.
Źródło:: Journal of Polish Safety and Reliability Association; 2009, 2; 223--230
2084-5316
Pojawia się w:: Journal of Polish Safety and Reliability Association
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Low energy electrons in non-polar liquids
Autorzy:: Schmidt, W.
Illenberger, E.
Powiązania:: https://bibliotekanauki.pl/articles/148513.pdf
Data publikacji:: 2003
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: electrons
energetics
kinetics
non-polar liquids
lifetime
Opis:: The properties of excess electrons in non-polar liquids have been studied for more than 30 years. Here, pertinent results are reviewed and discussed with respect to the possibility of studying electron-molecule interactions with low energy electrons in the liquid phase. Some new results on the estimate of the electron lifetime in the delocalized state in liquid hydrogen are presented.
Źródło:: Nukleonika; 2003, 48, 2; 75-82
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: How to support development of wise personality over lifetime? Review of The Wisdom of the Personality. Life Course Facilitation of Personality Development and Prevention of Personality Disorders by Helena Janet Grzegołowska-Klarkowska
Autorzy:: Kamila, Dobrenko,
Powiązania:: https://bibliotekanauki.pl/articles/896686.pdf
Data publikacji:: 2020-07-09
Wydawca:: Akademia Pedagogiki Specjalnej im. Marii Grzegorzewskiej. Wydawnictwo APS
Tematy:: support development of wise personality over lifetime
Opis:: Review of The Wisdom of the Personality. Life Course Facilitation of Personality Development and Prevention of Personality Disorders by Helena Janet Grzegołowska-Klarkowska
Źródło:: Psychologia Wychowawcza; 2020, 59(17); 223-238
0033-2860
Pojawia się w:: Psychologia Wychowawcza
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Measurement the Thermal Profile of Steelmaking Ladle with Subsequent Evaluation the Reasons of Lining Damage
Autorzy:: Vlček, J.
Jančar, D.
Burda, J.
Klárová, M.
Velička, M.
Machovčák, P.
Powiązania:: https://bibliotekanauki.pl/articles/354815.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ladle
refractory lining
temperature
enthalpy
ladle lifetime
Opis:: Based on the operational measurement, of which content was to determine ladle thermal profile, there were analysed causes of possible damage of lining in steel ladles by steel breakout through the ladle shell. There exists connection between thermal state of ladle lining during the operation and its lifetime. There were reached to the conclusion that the cause of failure in the lining of ladle is except for high temperature of bath, also wide interval of temperature change during the tap operation, in consequence with possible insufficient pre-heating of ladle, discontinuous operation of aggregate and damage of insulating lining layer, respectively deformation of ladles shell.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 1; 279-282
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Uwarunkowania braku partnera życiowego w percepcji młodych dorosłych żyjących w pojedynkę
Autorzy:: Palus, Katarzyna
Powiązania:: https://bibliotekanauki.pl/articles/637325.pdf
Data publikacji:: 2011
Wydawca:: Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:: young adulthood, lifetime partner, singlehood, narrative-biographical interview
Opis:: The conditions of the lack of a lifetime partner in young adult singles’ perception The research field of this paper are the conditions of the lack of a lifetime partner in young adulthood. This research so called narrative-biographical interviews designed by Schütze was conducted with 36 participants not having partners (22 women and 14 men) in the age of 21–30 years. The foundation of the analysis was (1) Schütze’s narrative analysis and (2) hermeneutic analysis of autonarration used in the Bartosz’s research over motherhood. In the result of analysis participants’ responses were grouped into six categories of reasons for being single. Referring to respondents’ language they were called as follows: (1) “I haven’t met the right person yet”, (2) “I need time to recover from the break up”, (3) “My shyness stands in the way”, (4) “He/she doesn’t want me”, (5) “I’m a loner”, (6) “I work a lot”. The research results let us formulate the following general conclusions: (1) young adults indicate various reasons for being singled and which are of external and internal character and (2) in most cases young adults admit that it is hard to identify only one reason for singlehood which is often the consequence of many tangled circumstances.
Źródło:: Psychologia Rozwojowa; 2011, 16, 1
1895-6297
2084-3879
Pojawia się w:: Psychologia Rozwojowa
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: The Influence of the Base Material Parameters on Quantum and Photoconversion Efficiency of the Si Solar Cells
Autorzy:: Panek, P.
Powiązania:: https://bibliotekanauki.pl/articles/352268.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: silicon solar cell
dopant level
charge carrier lifetime
Opis:: The influence of a p-type Si with different resistivity, charge carrier lifetime and emitter dopant impurities concentration on the crystalline silicon solar cells parameters were analyzed and experimentally checked. The findings were determined by quasi-steady-state photoconductance, current-voltage and spectral response methods. The study was accompanied by solar device simulation using a numerical PC1D program. The highest photoconversion efficiency of 15.13 % was obtained for the moncrystalline (Cz-Si) solar cell with a base resistivity of 1.8 Ωcm and an effective charge carrier lifetime of 22.9 μs. The results clearly confirmed the importance concerning the dopant level in a Si base material in relation to open circuit voltage and short circuit current possible to obtain from the solar cell. Reduction of a base material resistivtiy leads to a lower value of an effective charge carrier lifetime and photoconversion efficiency both for Cz-Si and multicrystalline (mc-Si) solar cells. The experimental results and calculation showed, that in the case of a solar cell produced on the basis of crystalline silicon, the most important spectral range for an efficiency of a cell is covering a wavelength range of 587 ÷ 838 nm.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 4; 1889-1894
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Application of the strain energy density parameter for estimation of multiaxial fatigue life of sintered steels with stress concentrators
Zastosowanie parametru gęstości energii odkształceń do oceny wieloosiowego zmęczenia stali spiekanych z koncentratorami naprężeń
Autorzy:: Łagoda, T.
Sonsino, C. M.
Ogonowski, P.
Powiązania:: https://bibliotekanauki.pl/articles/280271.pdf
Data publikacji:: 2009
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: energy models
cyclic loading
fatigue lifetime
sintered steel
Opis:: This paper presents fatigue test results of a Fe-Cu sintered alloy (1.5% Cu) and three types of Fe-Cu-Ni sintered alloys (2% Cu, 2.5% Ni). Fe-Cu-Ni sintered alloys were produced under different compaction pressures and sintering temperatures. Round specimens with fillet notches were subjected to a constant amplitude pure bending, pure torsion and a combined in-phase and out-of-phase ( = 90.) bending with torsion. All results have been described by the criterion of the strain energy density parameter on the critical plane. It was assumed that the fatigue life is influenced by a linear combination of normal and strain energy density parameters with the coefficients that refer to the calculated plane. In particular, it allowed one to compute fatigue lives sufficiently comparable to the experimental ones.
W pracy przedstawiono rezultaty badań zmęczeniowych spieku Fe-Cu o zawartości 1.5% miedzi oraz trzech rodzajów spieku Fe-Cu-Ni o zawartości 2% miedzi i 2.5% niklu. Do badań zastosowano próbki okrągłe z koncentratorami naprężeń w postaci odsadzenia. Zakres badań obejmował stałoampitudowe zginanie, skręcanie oraz kombinacje proporcjonalnego i nieproporcjonalnego zginania ze skręcaniem. Wyniki badań eksperymentalnych zostały opisane przy zastosowaniu kryterium parametru energetycznego, opartego na koncepcji płaszczyzny krytycznej. Trwałość zmęczeniowa została wyznaczona na podstawie liniowej kombinacji parametru gęstości energii odkształceń normalnych oraz stycznych z pewnymi współczynnikami w przyjętej płaszczyźnie krytycznej. W większości przypadków otrzymano zadowalającą zgodność trwałości obliczeniowych z eksperymentalnymi.
Źródło:: Journal of Theoretical and Applied Mechanics; 2009, 47, 1; 161-175
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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