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Tytuł:
Various Methods for the Determination of the Burning Rates of Solid Propellants : an Overview
Autorzy:
Gupta, G.
Jawale, L.
Mehilal, D.
Bhattacharya, B.
Powiązania:
https://bibliotekanauki.pl/articles/358413.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
burning rate
composite solid rocket propellant
acoustic emission system
erosive burning
Opis:
The burning rate of propellants plays a vital role among the parameters controlling the operation of solid rocket motors, therefore, it is crucial to precisely measure the burning rate in the successful design of a solid rocket motor. In the present review, a brief description of the methods for the determination of the burning rate of solid rocket propellants is presented. The effects of various parameters on the burning rate of solid propellants are discussed and reviewed. This review also assesses the merits and limitations of the existing different methods for the evaluation of the burning rate of solid rocket propellants.
Źródło:
Central European Journal of Energetic Materials; 2015, 12, 3; 593-620
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of a Phase Resolved Partial Discharge Pattern Analysis for Acoustic Emission Method in High Voltage Insulation Systems Diagnostics
Autorzy:
Kunicki, M.
Cichoń, A.
Powiązania:
https://bibliotekanauki.pl/articles/177912.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic emission
partial discharge
transformer diagnostics
insulation system
Opis:
An alternative method for analysis of acoustic emission (AE) signals generated by partial discharges (PD), based on a correlation between voltage phase run and AE pulses, so called phase resolved PD pattern (PRPD), is presented in the paper. PRPD pattern is a well-known analysis tool commonly used in such PD diagnostic methods as conventional electrical and UHF ones. Moreover, it yields various signal analysis abilities and allows a direct correlation indication between measurement results achieved using different methods. An original PRPD measurement methodology applied for AE method as well as some exemplary measurement results and further data analysis capabilities are presented in the paper. Also a comparative analysis of PRPD patterns achieved using various measurement methods and different PD source configurations have been investigated. All presented experiments were done under laboratory conditions using PD model sources immersed in the insulation oil. The main purpose of the presented research is to indicate an all-embracing analytical tool that yields an ability to direct comparison (qualitative as well as quantitative) of the AE measurement results with other commonly applied PD measurement methods. The presented results give a solid fundamental for further research work concerning a direct correlation method for AE and other described in the paper diagnostic techniques, mainly in order to continue PD phenomena analysis and assessment in real life high voltage apparatus insulation systems under normal onsite operation conditions.
Źródło:
Archives of Acoustics; 2018, 43, 2; 235-243
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variability of the Acoustic Emission Signals Generated by Partial Discharges in Mineral Oil
Autorzy:
Kunicki, Michał
Powiązania:
https://bibliotekanauki.pl/articles/177772.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
acoustic emission
partial discharge
insulation system
measurements
signal processing
Opis:
The main purpose of the presented research is to investigate the partial discharge (PD) phenomenon variability under long-term AC voltage with particular consideration of the selected physical quantities changes while measured and registered by the acoustic emission method (AE). During the research a PD model source generating surface discharges is immersed in the brand new insulation mineral oil. Acoustic signals generated by the continuously occurred PDs within 168 hours are registered. Several qualitative and quantitative indicators are assigned to describe the PD variability in time. Furthermore, some longterm characteristics of the applied PD model source in mineral oil, are also presented according to acoustic signals emitted by the PD. Finally, various statistical tools are applied for the results analysis and presentation. Despite there are numerous contemporary research papers dealing with long-term PD analysis, such complementary and multiparametric approach has not been presented so far, regarding the presented research. According to the presented research from among all assigned indicators there are discriminated descriptors that could depend on PD long-term duration. On the grounds of the regression models analysis there are discovered trends that potentially allow to apply the results for modeling of the PD variability in time using the acoustic emission method. Subsequently such an approach may potentially support the development and extend the abilities of the diagnostic tools and maintenance policy in electrical power industry.
Źródło:
Archives of Acoustics; 2019, 44, 2; 339-348
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An algorithm for diagnosing injection systems of marine engines
Autorzy:
Bejger, Artur
Drzewieniecki, Jan
Powiązania:
https://bibliotekanauki.pl/articles/27315912.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
diesel engine
injection system
diagnosis
acoustic emission
elastic waves
Opis:
The article presents the developed methods for diagnosing and analysing signals from injection systems of marine engines. As a source signal, the authors use elastic waves of acoustic emission. The essential fact in the case here considered is that the high frequency of signal from working elements of the injection system comes from a close source directly related to the change of the working parameters of the element (system). Characteristically for elastic waves of acoustic emission, low frequencies (e.g. those from other sources, such as machines in the engine room) are in this case attenuated. Therefore, the proper selection of the method for the analysis allows us accurately diagnose the injection system of a working engine.
Źródło:
New Trends in Production Engineering; 2018, 1, 1; 227--233
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis on Acoustic Disturbance Signals Expected During Partial Discharge Measurements in Power Transformers
Autorzy:
Kunicki, Michał
Powiązania:
https://bibliotekanauki.pl/articles/1953519.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
acoustic emission
partial discharge
insulation system
measurements
power transformers
Opis:
This paper presents comparative analysis of various acoustic signals expected during partial discharge (PD) measurements in operating power transformer. Main purpose of the paper is to yield relevant and reliable method to distinguish between various acoustic emission (AE) signals emitted by PD and other sources, with particular consideration of real-life results rather than laboratory simulations. Therefore, selected examples of real-life AE signals registered in seven different power transformers, under normal operation conditions, within few years are showed and analyzed. Five scenarios are investigated, which represent five types of AE sources: PD generated by artificial sources, and next four real-life sources (including PD in working transformer, oil flow, oil pumps and core). Several different signal processing methods are applied and compared in order to identify the PD signals. As a result, an energy patterns analysis based on the wavelet decomposition is found as the most reliable tool for identification of PD signals. The presented results may significantly support the process of interpretation of the PD measurement results, and may be used by field engineers as well as other researchers involved in PD analysis using AE method. Finally, observed properties also provide a solid basis for establishing or improving complete classification method based on the artificial intelligence algorithms.
Źródło:
Archives of Acoustics; 2020, 45, 4; 733-746
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The 8AE-PD computer measurement system for registration and analysis of acoustic emission signals generated by partial discharges in oil power transformers
Autorzy:
Witos, Franciszek
Opilski, Zbigniew
Szerszeń, Grzegorz
Setkiewicz, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/220623.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic emission
partial discharge
multichannel system
acoustic signal detection
acoustic signal processing
signal analysis
voltage preamplifier
Opis:
A computer measurement system, designed and built by authors, dedicated to location and description of partial discharges (PD) in oil power transformers examined by means of the acoustic emission (AE) method is presented. The measurement system is equipped with 8 measurement channels and ensures: monitoring of signals, registration of data in real time within a band of 25-1000 kHz in laboratory and real conditions, basic and advanced analysis of recorded signals. The basic analysis carried out in the time, frequency and time-frequency domains deals with general properties of the AE signals coming from PDs. The advanced analysis, performed in the discrimination threshold domain, results in identification of signals coming from different acoustic sources as well as location of these sources in the examined transformers in terms of defined by authors descriptors and maps of these descriptors on the side walls of the tested transformer tank. Examples of typical results of laboratory tests carried out with the use of the built-in measurement system are presented.
Źródło:
Metrology and Measurement Systems; 2019, 26, 2; 403-418
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calibration and Laboratory Testing of Computer Measuring System 8AE-PD Dedicated for Analysis of Acoustic Emission Signals Generated by Partial Discharges Within Oil Power Transformers
Autorzy:
Witos, F.
Szerszeń, G.
Opilski, Z.
Setkiewicz, M.
Olszewska, A.
Duda, D.
Maźniewski, K.
Szadkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/177029.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multichannel system
calibration
acoustic emission
partial discharge
power oil transformers
Opis:
In the paper, there are presented a general description of the constructed measuring system 8AE-PD, the results of calibration of this system by the Hsu-Nielsen method as well as the testing of the measuring system during recording signals generated by Hsu-Nielsen sources in a steel plate and a modeled partial discharge (PD) source. There is also presented the methodology of investigations by the calibrated acoustic emission method. The results of analyses of PD signals coming from the modeled sources are given. In particular, there are described the properties of acoustic emission (AE) signals generated by the PDs as well as the dependencies of the peak-to-peak voltage Umm, the RMS voltage Urms and the descriptors of acronyms ADP and ADC on the apparent charge Q introduced by the modeled PD source. There are determined the limit values of the apparent charge Q introduced by the modeled PD source for which the recorded signal is identified as originating from the PDS.
Źródło:
Archives of Acoustics; 2017, 42, 2; 297-311
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of Amplitude Distributions of Acoustic Emission Signals Generated in Pressure Vessel During Testing
Autorzy:
Witos, Franciszek
Powiązania:
https://bibliotekanauki.pl/articles/178028.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
acoustic emission
multichannel measuring system
amplitude distribution
descriptors
pressure vessel
Opis:
In the paper, the results of investigations on the properties of acoustic emission signals generated in a tested pressure vessel are presented. The investigations were performed by repeating several Times the following procedure: an increase in pressure, maintaining a given pressure level, a further increase in pressure, and then maintaining the pressure at new determined level. During the tests the acoustic emission signals were recorded by the measuring system 8AE-PD with piezoelectric sensors D9241A. The used eight-channel measuring system 8AE-PD enables the monitoring, recording and then basic and advanced analysis of signals. The results of basic analysis carried out in domain of time and the results of advanced analysis carried out in the discrimination threshold domain of the recorded acoustic emission signals are presented in the paper. In the framework of the advanced analysis, results are described by the defined by the author descriptors with acronyms ADC, ADP and ADNC. Such description is based on identifying the properties of amplitude distributions of acoustic emission signals by assigning them the level of advancement. It is shown that for signals including continoues AE or single burst AE signals descriptions of such registered signals by means of ADC, ADP and ADNC descriptors and by Upp and Urms descriptors provide identical ordering of registered acoustic emission signals. For complex signals, the description using ADC, ADP and ADNC descriptors based on the analysis of amplitude distributions of recorded signals gives the order of signals with more accurate connection with deformational processes being sources of acoustic emission signals.
Źródło:
Archives of Acoustics; 2019, 44, 3; 493-503
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic emission signals associated with prebreakdown state in air high voltage insulating systems
Autorzy:
Dobrzycki, A.
Opydo, W.
Zakrzewski, S.
Powiązania:
https://bibliotekanauki.pl/articles/97311.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
high voltage insulating system
breakdown voltage
acoustic emission method
dielectric coatings
Opis:
The paper presents the method of acoustic emission (AE) in the study of the state of insulation systems with air as the high-voltage insulation. The tested object was a planar system of electrodes made of aluminum. In addition, the analysis of AE signals and the impact on these signals the presence of dielectric coating on the electrode surfaces of aluminum was tested. We examined the influence of saturation (seal) these coatings on the dielectric strength of the insulation system. The study was conducted at an air pressure values 1·105, 3·105 and 5·105 Pa. The strength of the electrical systems were tested at alternating voltage with a frequency of 50 Hz. Noted pros and cons of using the method of EA in the context of the assessment of high-voltage electric insulation devices. The presented results confirm the possibility of using acoustic emission method, not only for identifying vulnerable areas, but also to predict the time of of further use of high voltage device.
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 278-286
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aktualne możliwości i perspektywy zastosowania metody emisji akustycznej w diagnostyce układów izolacyjnych
Present possibilities and prospects of the acoustic method application in diagnostics of insulation systems
Autorzy:
Skubis, J.
Boczar, T.
Powiązania:
https://bibliotekanauki.pl/articles/153254.pdf
Data publikacji:
2006
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
metoda emisji akustycznej
wyładowania niezupełne
system ekspercki
acoustic emission method
partial discharges
expert system
Opis:
W artykule zostały scharakteryzowane prowadzone obecnie przez autorów artykuły prace związane z doskonaleniem akustycznej metody pomiaru wyładowań elektrycznych, jakie mogą występować w układach izolacyjnych urządzeń elektroenergetycznych. Szczególną uwagę zwrócono na ekspercki system diagnostyczny wykorzystujący metodę emisji akustycznej do oceny stanu mierzonej izolacji transformatorów energetycznych.
The paper characterizes the research work on the improvement of the acoustic method of the measurements of electrical discharges that can occur in insulation systems of power appliances. The utmost attention was directed to the expert diagnostic system using the acoustic emission method for the evaluation of the condition of the power transformer insulation measured.
Źródło:
Pomiary Automatyka Kontrola; 2006, R. 52, nr 10, 10; 44-45
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the possibility of using acoustic emission for monitoring technical condition of the fuel injector in 3AL25/30 engine
Autorzy:
Dudzik, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/27315939.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
emisja akustyczna
diagnostyka
monitoring
wtryskiwacz
układ paliwowy
acoustic emission
diagnostics
injector
fuel system
Opis:
Acoustic emission method (AE) can be used for the diagnosis of machine parts such as, for example: fuel injectors. This paper presents the methodology and research results of 3AL25/30 engine fuel injector. During research was studied one injector in good condition and second with simulated failure involving closing 2 of 9 holes of the injector tip. Research was carried out on a laboratory test stand using a set of acoustic emission Vallen System. This set included: 4 channel signal recorder AMSY 6, two measurement modules ASIP-2/S, preamplifier with a frequency range 20 kHz-1 MHz and the strengthening of 34 dB, AE signal measurement sensor type VS 150M, with a frequency range 100-450 kHz. During the study, the acoustic emission (AE) generated by tested injector was recorded. The following parameters were determined: amplitude, rise time, duration time, total time, number of events - hits, the effective value of the signal (RMS). Analysis of the results showed significantly longer total time of the injection in the case of damaged injector compared to the injector in good conditions. Signal amplitude was higher, however, the RMS signal reached approximately 3-times lower value for the injector with damaged tip. This means lower quality fuel atomization. Laboratory test results were compared with signals recorded on injectors installed in the engine. Analysis of the signals allowed detection damage of the injector installed in the engine during normal operation.
Źródło:
New Trends in Production Engineering; 2018, 1, 1; 419-425
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza pasm częstotliwości sygnału emisji akustycznej zależnych od zjawisk zachodzących we wtryskiwaczu
Analysis of acoustic emission signal frequency bands dependent on phenomena in an injector
Autorzy:
Bejger, A.
Powiązania:
https://bibliotekanauki.pl/articles/360269.pdf
Data publikacji:
2008
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
emisja akustyczna
wtryskiwacz
układ wtryskowy
silnik wysokoprężny
acoustic emission
injector
injection system
diesel engine
Opis:
W artykule zaprezentowano wyniki badań określające pasma częstotliwości sygnału emisji akustycznej (EA) związane ze zjawiskami zachodzącymi w układzie wtryskowym silnika wysokoprężnego. Na podstawie analizy czasowo-częstotliwościowej określono gęstość widmową wyznaczoną dla zjawiska lub zachodzących zmian spowodowanych zużyciem bądź uszkodzeniem wybranego elementu wtryskiwacza.
The presented research results specify the frequencies of an acoustic emission (AE) signal connected with phenomena occurring in the injection system of a diesel engine. From the time-frequency analysis the spectrum density was determined for a phenomenon or changes caused by the wear or damage of a selected injector component.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2008, 14 (86); 5-8
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Durability and wear of engine parts – new methods of testing of alloys and composites
Autorzy:
Ranachowski, Z.
Pawełek, A.
Jasieński, Z.
Piątkowski, A.
Kudela Jr., S.
Lewandowski, M.
Mazuruk, P.
Powiązania:
https://bibliotekanauki.pl/articles/360606.pdf
Data publikacji:
2013
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
Diesel engines diagnostics
light alloys and composites
Common Rail fuel system
Acoustic Emission method
Opis:
The paper deals with the problems related to the diagnostics of selected parts of modern Diesel engines. The evolution of mechanical properties of four alloys of Mg-Li-Al system and four composites made on the base of the alloys mentioned above, caused by variation of its composition was presented. The Acoustic Emission (AE) method applied to monitoring of degradation of mechanical properties of the alloys and composites was described. Moreover, the results of the investigation of failures occurring in the injectors of Common Rail Diesel engines performed with the application of AE method were also reported.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 35 (107); 125-131
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The reduction in force interaction of wheel with the rail in the curves by means of the automatic control over the locomotive wheel pair position
Snizhenie urovnja silovogo vzaimodejjstvija koles s relcami avtomaticheskim upravleniem polozheniem kolesnykh par lokomotiva
Autorzy:
Ulshin, V.
Klyuyev, S.
Powiązania:
https://bibliotekanauki.pl/articles/793141.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
locomotive
automated control system
acoustic emission
force interaction
wheel
railway
wheel pair
rail track
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mobilny system pomiarowy do badania zjawiska wyładowań niezupełnych metodą emisji akustycznej
: Mobile measuring system for investigating partial discharge phenomena by the acoustic emission method
Autorzy:
Błachowicz, A.
Boczar, T.
Powiązania:
https://bibliotekanauki.pl/articles/155765.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
metoda emisji akustycznej
wyładowania niezupełne
system czasu rzeczywistego
mobilny system pomiarowy
acoustic emission method
partial discharges
real time system
mobile measuring system
Opis:
W artykule przedstawiono założenia projektowe oraz sposób realizacji mobilnego sytemu umożliwiającego pomiary wyładowań niezupełnych (WNZ), jakie mogą występować w izolacji kondensatorów elektroenergetycznych do kompensacji mocy biernej, wykonywane przy zastosowaniu metody emisji akustycznej (EA). Zdefiniowana została podstawowa potrzeba budowy mobilnego systemu pomiarowego. Z uwagi na utrudniony dostęp oraz pracę w warunkach mogących bezpośrednio zagrozić życiu osób diagnozujących stan obiektu elektroenergetycznego, znajdującego się w rozdzieli średniego napięcia, detekcja zjawiska WNZ jest znacznie utrudniona. Autorzy prezentują rozwiązanie umożliwiające diagnozę prowadzoną zdalnie, z jednoczesną możliwością wykonywania pomiarów diagnostycznych układów izolacyjnych metodą on-line. Artykuł zawiera informacje dotyczące rozwiązań zastosowanych w systemie. System składa się z kilku, ściśle związanych ze sobą elementów, dla których przewidziano odpowiednie funkcje. Zaprezentowane zostały możliwości elementów takich jak aplikacja WNZDetect, robot mobilny oraz część pomiarowo detekcyjną. Zaprezentowany został robot o nazwie SQ1, który został wyposażony w kilka typów modułów. Są to: moduł główny, dwa moduły sterujące pracą kół oraz moduł monitorujący. W artykule scharakteryzowano ich funkcjonalność i rolę pełnioną w systemie. Autorzy opisali wykorzystany do oprogramowania modułów robota, system czasu rzeczywistego o nazwie Nut/OS. Przedstawione zostały również, zawarte w środowisku Ethernut (Nut/OS) biblioteki oraz funkcje poszczególnych pakietów. W podsumowaniu zdefiniowano dalsze perspektywy wykorzystania zbudowanego systemu w badaniu zjawiska WNZ.
The paper presents design assumptions and the way of realizing the mobile system which enables measurements of partial discharges (PDs) which can occur in insulation of electric power capacitors for compensation of reactive power. The measurements are taken by means of the acoustic emission (AE) method. The basic need for building a mobile measuring system is defined. Due to a difficult access and work under conditions which can be hazardous to lives of people diagnosing the condition of an electric power object in the mean-voltage switching station, the detection of the PD phenomenon is significantly difficult. The authors propose a solution making it possible to perform a remotely-controlled diagnosis with simultaneous possibility of taking diagnostic measurements of insulation systems by the on-line method. The paper contains information on the solutions applied in the system. The system consists of a few elements closely connected with one another for which adequate functions are predicted. The possibilities of such elements as the WNZDetect application, a mobile robot and a measuring and detecting part are given. Also a robot called SQ1 equipped with a few types of modules is presented. They are: the main module, two modules controlling the operation of the wheels and a monitoring module. Their functionality and the role in the system are characterized in the paper. The authors describe the real time system called Nut/OS used for programming the robot modules. There are also presented libraries and functions of the particular packets contained in the Ethernut (Nut/OS) environment. In the final remarks further perspectives of using this system in PD phenomenon investigations are defined.
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 1, 1; 27-29
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 23

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