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Wyświetlanie 1-15 z 18
Tytuł:
Acoustic emission of monolithic IGBT transistors
Autorzy:
Bejger, A.
Kozak, M.
Gordon, R.
Powiązania:
https://bibliotekanauki.pl/articles/27315861.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Opis:
Due to the increasing number of applications of power semiconductor devices, more and more attention is being paid to diagnostic methods to determine the condition of working semiconductor components. On the basis of the results of experimental research, a correlation can be observed between the transition between the on/off states of a single IGBT transistor in operation and the acoustic signal emitted by it. Acquisition of acoustic emission signals was obtained using a specialized sensor from Vallen. To record the received signal, a high resolution digital oscilloscope was used, which exported the recorded signal to a file, which enabled further digital processing of the acquired signals. The aim of the study was to determine the usefulness of acoustic emission detection methods to determine the possibility of damage to an element based on the recorded acoustic signal.
Źródło:
New Trends in Production Engineering; 2018, 1, 1; 755-760
2545-2843
Pojawia się w:
New Trends in Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bivalve Characterization Using Synchrotron Micro X-Ray Fluorescence
Autorzy:
Jones, K.
Bronson, S.
Brink, P.
Gordon, C.
Mosher-Smith, K.
Brown, M.
Chaudhry, S.
Rizzo, A.
Sigismondi, R.
Whitehurst, M.
Lukaszewski, A.
Kranz, D.
Bland, K.
Gordan, D.
Lobel, J.
Sullivan, J.
Metzger, M.
O'Shea, C.
Harris, C.
Arezzo, R.
Kambhampati, M.
Powiązania:
https://bibliotekanauki.pl/articles/1808352.pdf
Data publikacji:
2009-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
01.40.-d
07.85.Qe
82.80.Ej
87.59.-e
Opis:
Bivalves, oysters, mussels, and clams are important constituents of riverine and estuarine ecosystems. Their shells and soft tissues provide information on the environments in which they live. Since they are filter feeders, they also are factors in improving water quality through removal of particulate matter from the water column. Finally, they are a valuable food source that has substantial economic value. Hence, characterization of shells and soft tissues is useful for improved understanding of these factors. Here, we used X-ray microprobes and computed microtomography facilities at the Brookhaven National Synchrotron Light Source to investigate elemental distributions in bivalves taken from locations around New York, Washington, DC, and New Orleans, LA. The results form the initial basis for compilation of a database of relevant parameters that can serve for tracking environmental changes and for assessing toxicity of particular metals. The work was enabled by active collaboration with students from the several regions, community groups, and research scientists. The collaboration was facilitated through use of web conferencing between Brookhaven National Laboratory and the varied locations.
Źródło:
Acta Physica Polonica A; 2009, 115, 2; 477-481
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Control of squirrel-cage electric generators in a parallel intermediate DC circuit connection
Autorzy:
Kozak, M.
Gordon, R.
Bejger, A.
Powiązania:
https://bibliotekanauki.pl/articles/135529.pdf
Data publikacji:
2016
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
back-to-back
DC link
power distribution
VSI
FOC
power machine
Opis:
The paper covers the theoretical background and tests of two asynchronous squirrel cage generators connected to voltage source inverters working in parallel. Inverters were connected in parallel by their intermediate direct current circuits by means of auctioneering diodes, and then to a DC power network. The real-time control algorithm of digital signal processor DSP and field-programmable gate array FPGA was used to achieve proper excitation of two different power machines, and to maintain high enough levels of direct current link voltage. Windings of both generators are fed by use of so-called machine side inverters. The asynchronous generator is a voltage source inverter controlled by a field-oriented control algorithm based on the current machine model. To prove robustness of the chosen algorithm, different types of load were applied while generators and inverters worked in parallel.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 45 (117); 17-22
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection and Recording of Acoustic Emission in Discrete IGBT Transistors
Autorzy:
Gordon, R.
Dreas, A.
Powiązania:
https://bibliotekanauki.pl/articles/2064954.pdf
Data publikacji:
2018
Wydawca:
STE GROUP
Tematy:
IGBT Modules
IGBT Transistor
Acoustic Emission
Opis:
The article presents the results of experimental research, which is to show a correlation between the change of operating status of single IGBT transistor and its acoustic emission. Sensor signal was obtained with oscilloscope in order to further process it digitally and determine possibility of the damage to the element based on registered acoustic signal.
Źródło:
Multidisciplinary Aspects of Production Engineering; 2018, 1, 1; 27--31
2545-2827
Pojawia się w:
Multidisciplinary Aspects of Production Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolution of rill networks on soil - mantled experimental landscapes driven by rainfall and baselevel adjustments
Autorzy:
Gordon, L. M.
Bennett, S. J.
Wells, R. R.
Powiązania:
https://bibliotekanauki.pl/articles/294356.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
rill erosion
rill networks
headcuts
simulated rainfall
digital elevation models
Opis:
Experiments were conducted using a soil-mantled flume subjected to simulated rain and downstream baselevel lowering to quantify the evolution of rill networks. Results show that: (1) headcuts formed by baselevel lowering were the primary drivers of rill incision and network development, and the communication of this wave of degradation occurred very quickly through the landscape, (2) rill networks extended upstream by headcut erosion, where channels bifurcated and filled the available space, (3) rill incision, channel development, and peaks in sediment efflux occurred episodically, linked directly to the downstream baselevel adjustments, and (4) sediment discharge and rill drainage density approached asymptotic values with time following baselevel adjustments despite continuous application of rainfall. These findings have important implications for the prediction of soil loss, rill network development, and landscape evolution where headcut erosion can occur.
Źródło:
Landform Analysis; 2011, 17; 57-63
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inverse methods in hydrologic optics
Autorzy:
Gordon, H.R.
Powiązania:
https://bibliotekanauki.pl/articles/48466.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
water body
inverse method
fluorescence
inelastic process
optical property
inherent optical property
irradiance
Opis:
Methods for solving the hydrologic-optics inverse problem, i.e., estimating the inherent optical properties of a water body based solely on measurements of the apparent optical properties, are reviewed in detail. A new method is developed for the inverse problem in water bodies in which fluorescence is important. It is shown that in principle, given profiles of the spectra of up- and downwelling irradiance, estimation of the coefficient of inelastic scattering from any wave band to any other wave band can be effected.
Źródło:
Oceanologia; 2002, 44, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Podejmowanie decyzji na szczeblu operacyjnym (wg poglądów amerykańskich)
Autorzy:
Sullivan, Gordon R.
Powiązania:
Wojskowy Przegląd Zagraniczny 1989, z. 3, s. 31-40
Współwytwórcy:
Cz.S. Opracowanie
Data publikacji:
1989
Tematy:
Decyzje (wojsk.) teoria Stany Zjednoczone 1989 r.
Dowodzenie operacyjne teoria Stany Zjednoczone 1989 r.
Sztuka operacyjna 1989 r.
Opis:
Streszcz. art.: Learning to Decide of the Operational Level of War, zamieszcz. w "Military Review". --- 1987, nr 10, s. 16-23.
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Point-Contact I-V Characteristics of the Electroluminescent ZnS:Mn,Cu Thin Films Studied by STM
Autorzy:
Szuba, S.
Czajka, R.
Gordon, W. S.
Polewska, W.
Raułuszkiewicz, J.
Reich, A.
Powiązania:
https://bibliotekanauki.pl/articles/1879824.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Ey
73.40.Gk
73.60.Fw
Opis:
STM images of ZnS:Mn,Cu thin films and spatially resolved current-voltage characteristics are shown. The results make possible to estimate the morphology and conductivity distribution with nanometer resolution.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 171-174
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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