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Wyświetlanie 1-15 z 33
Tytuł:
Ultra-low voltage VDCC design by using DTMOS
Autorzy:
Başak, M.
Kaçar, F.
Powiązania:
https://bibliotekanauki.pl/articles/1068583.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.30.Tv
84.30.Vn
Opis:
In this paper, a new ultralow voltage and ultralow power voltage differencing current conveyor based on dynamic threshold voltage MOS transistors was proposed. The simulations were performed by using LTSpice Program with TSMC CMOS 0.18 μ m process parameters. A new notch filter configuration was also presented as an application for the proposed voltage differencing current conveyor. The power consumption of proposed voltage differencing current conveyor was simply 12.42 nW at symmetric ± 0.2 V supply voltage. The simulation results were found in close agreement with the theoretical results.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 223-225
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Comparison of QPSK Based Single and Double Stage Digital Interpolators
Autorzy:
Ratan, R.
Sharma, S.
Kohli, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399677.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.30.Qi
84.30.Vn
Opis:
In this paper, the performance of single stage and double stage digital interpolators has been compared and has been showed that by using multi stage interpolation system the reliability of any communication system increases drastically. Digital signal interpolation systems can be implemented in a variety of ways. The basic interpolator for up-sampling can be a combination of an expander unit with an interpolation low-pass filter in cascade. Complicated implementations can be done by connecting multiple expander and low-pass filter pairs in cascade. This paper presents the efficient implementation of digital interpolation systems for up-sampling of single stage and double stage digital interpolators by using quadrature phase shift keying technique. Comparison is done in terms of spectrum of generated signal, envelope power, modulated signal trajectory, input and output constellation and noise performance.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 196-198
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical Solution of the Problem of Vibration of Plates with Piezoelectric Actuators with Arbitrary Shape in Distribution Formulation
Autorzy:
Wiciak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1490307.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.At
43.40.Vn
Opis:
This paper is concerned with mathematical aspects of modelling vibration of a plate with piezoelectric actuators. Particularly, a thin Kirchhoff-Love plate with arbitrary shaped actuators (e.g. triangles, parallelograms, discs) is considered. The moments that act upon a structure and are induced by piezoelectric actuators, are described by the generalized tensor product of a distribution and distribution-valued function. Finally, the formula for the solution of the Cauchy problem in the class of absolutely continuous tempered distribution-valued functions is derived.
Źródło:
Acta Physica Polonica A; 2012, 121, 1A; A-142-A-147
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of a Circular Plate with Piezoelectric Actuators of Arbitrary Shape
Autorzy:
Wiciak, M.
Trojanowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1400087.pdf
Data publikacji:
2013-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.At
43.40.Vn
Opis:
This paper is concerned with mathematical aspects and numerical modeling of vibration of a circular plate with piezoelectric actuators. Particularly, a thin Kirchhoff-Love plate with arbitrary shaped actuators (e.g. pie-shaped, trapezoid, disc, and rectangular) is considered. In the theoretical model, the moments that act upon a structure and are induced by piezoelectric actuators are described by the generalized tensor product of a distribution and distribution-valued function. Numerical computations utilize the FEM approach supported by Ansys software.
Źródło:
Acta Physica Polonica A; 2013, 123, 6; 1048-1053
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis of the Effectiveness of Two-part Piezoactuators in Vibration Reduction of Plates
Autorzy:
Wiciak, M.
Trojanowski, R.
Powiązania:
https://bibliotekanauki.pl/articles/1197498.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.At
43.40.Vn
Opis:
This paper is concerned with application of piezoelements with a step change of material properties occurring in the element's plane. Each part of an element may be controlled independently. Analytical models for different shape and location of the inner part of a two-part piezoactuator are developed. Finally, results of numerical simulations concerning effectiveness in vibration reduction of piezoactuators constructed this way are presented.
Źródło:
Acta Physica Polonica A; 2014, 125, 4A; A-183-A-189
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wide Stopband Microstrip Bandpass Filter Based on a Compact Slotted Ground Structure
Autorzy:
Challal, M.
Dehmas, M.
Azrar, A.
Aksas, R.
Trabelsi, M.
Powiązania:
https://bibliotekanauki.pl/articles/1402538.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.30.Vn
84.40.-x
Opis:
A new concept for implementing a bandpass filter by employing a discontinuity in the feed microstrip line in the upper layer and modified dumbbell-shaped slots etched in the ground plane is proposed. The effect of the slot area on the bandpass filter performance is examined. The proposed bandpass filter showed wide stopband and low insertion loss. To further verify the new concept, the structure is implemented and the measurement results are found to be in good agreement with the simulation ones. The proposed structure can be used in various microwave circuits.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-71-B-72
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient Implementation of Multistage Digital Interpolators Using Half Band Filters
Autorzy:
Ratan, R.
Sharma, S.
Kohli, A.
Powiązania:
https://bibliotekanauki.pl/articles/1399680.pdf
Data publikacji:
2013-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.30.Qi
84.30.Vn
Opis:
The process of increasing the sampling rate of any signal by a factor is known as interpolation. This paper presents the effective and efficient implementation of multistage implementation of digital interpolator using half band filters. The single stage filters are efficient for lower order interpolation factors but for higher rate change which is required in modern digital communication systems like wideband code division multiple access, worldwide interoperability for microwave access single stage implementation does not gives efficient response. For these applications a multistage implementation of the interpolator is preferred. But multistage implementation increases complexity of the overall system. This complexity can be reduced considerably by using half band filters. All this has been done with the help of the Agilent's advanced design software.
Źródło:
Acta Physica Polonica A; 2013, 123, 2; 199-201
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetotunneling Experiments Using La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ Based Break Junctions
Autorzy:
Baszyński, J.
Toliński, T.
Powiązania:
https://bibliotekanauki.pl/articles/1858231.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.40.Gk
75.30.Vn
Opis:
The La$\text{}_{0.7}$Sr$\text{}_{0.3}$MnO$\text{}_{3}$ perovskite is a ferromagnetic half-metal with a strong spin polarization and high Curie temperature T$\text{}_{C}$ (355K). We have shown that a combination of the break junction technique with the special properties of the La$\text{}_{0.7}$S$\text{}r_{0.3}$MnO$\text{}_{3}$ perovskite can lead to extremely high values of tunneling magnetoresistance ratio (> 10$\text{}^{3}$%) and high field sensitivity (30%/Oe). These results are obtained in magnetic fields below 1kOe and at room temperature.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 567-570
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combined Effect of CrB2 Micropowder and VN Nanopowder on the Strength and Wear Re-sistance of Fe‒Cu–Ni–Sn Matrix Diamond Composites
Autorzy:
Ratov, Boranbay
Mechnik, Volodymyr
Rucki, Miroslaw
Gevorkyan, Edwin
Kilikevicius, Arturas
Kolodnitskyi, Vasyl
Siemiatkowski, Zbigniew
Umirova, Gulzada
Chałko, Leszek
Józwik, Jerzy
Zhanggirkhanova, Arailym
Chishkala, Vladimir
Korostyshevskyi, Dmytro
Powiązania:
https://bibliotekanauki.pl/articles/2201897.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
diamond composite
electroconsolidation
composite microstructure
adhesion
CrB2
VN nanopowder
micropowder
VN
wear resistance
cutting tools
mining tools
Opis:
The paper presents research results on the enhancement of diamond composites designed for tools application for mining industry, hard rocks cutting, able to withstand harsh conditions under heavy dynamical loads. In the present study, both CrB2 micropowder and VN nanopowder additives were used in proportions up to 5 wt.% and 6 wt.%, respectively, together with the basic matrix composition of 51 wt.% Fe, 32 wt.% Cu, 9 wt.% Ni, and 8 wt.% Sn. Addition of both components, CrB2 and VN, appeared to be ad-vantageous in proportion of 2 wt.% and 4 wt.%, respectively. This composition exhibited the highest relative density of 0.9968, better than that without additives. Similarly, the highest values of compressive strength Rcm and flexural strength Rbm were reached for the composite with the same percentage of CrB2 and VN. Compared to the composite with no addition of CrB2 and VN, Rcm improved by almost 70%, while Rbm by 81%. Additionally, the abovementioned additives enhanced the ability of the matrix to prevent the diamond reinforcement from being torn out of the composite, which is very important under harsh working conditions of the cutting tools. The presence of CrB2 micropowder and VN nanopowder promoted densification of the matrix and adhesion between the diamond grits and the Fe‒Cu–Ni–Sn matrix.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 1; 23--34
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Ionizing Radiation Generated by Partial Discharges
Autorzy:
Zmarzły, D.
Nagi, Ł.
Borucki, S.
Boczar, T.
Powiązania:
https://bibliotekanauki.pl/articles/1199157.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
This paper presents the preliminary results of the performed experiment, based on common phenomenon of partial discharges. A simple Geiger-Muller counter (DP-66M) was used for measurement of a dose of ionizing radiation, which is accompanied by partial discharges. Values from which the radiation intensity was dependent could be controlled individually: the distance between measurer and source, as well as the voltage generating partial discharges. The obtained results indicate that in the examined phenomenon, significant dose of X-ray radiation is present. According to the Kramers-Kulenkampff theory, it depends also on the atomic number of elements involved. Using MATLAB software, the obtained data were compiled to develop suitable theory for further research study. There was also implemented fuzzification for the fuzzy logic, and the effect was the capability of forecasting radiation doses according to the fixed variables for a given material, where partial discharges were generated.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1377-1379
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Critical Evaluation of the Vibroacoustic Criteria Used in Poland to Diagnose of Power Transformer Cores
Autorzy:
Borucki, S.
Cichon, A.
Boczar, T.
Zmarzly, D.
Powiązania:
https://bibliotekanauki.pl/articles/1399335.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
The subject matter of this article concerns the diagnostic test results of transformer cores by measuring and analysing vibroacoustic signals registered during their normal operation. The main objective of this research study conducted by the authors, the results of which are published in this paper, is a critical analysis of vibroacoustic criteria, which are adopted in Poland nowadays, and based on which, the assessment of the core technical condition is performed. This article presents exemplary results that were obtained on two twin units of type TET 8509 with a power of 40 MVA. The paper specifies diagnosed structures, the measurement system applied, and the currently used methodology to assess the degree of core loosening. To determine the efficacy and assessment accuracy of the applied vibroacoustic criteria, correlation between mechanical vibration measurements of the tested transformer tanks and results obtained by gas chromatography was performed.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 391-394
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Repeatability Estimation for Vibration Measurement Results of Power Transformer Core
Autorzy:
Borucki, S.
Cichon, A.
Skubis, J.
Boczar, T.
Powiązania:
https://bibliotekanauki.pl/articles/1198972.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
The subject matter of this paper refers to the diagnostics of a transformer core, based on measurements and analysis of vibroacoustic signals registered during their normal operation. The paper presents results of the research aimed to evaluate the repeatability of vibration measurements for power transformer core. Recording of vibroacoustic signals was performed under laboratory conditions on dry-insulated transformers. The study concerned evaluation of changes in vibroacoustic indicators of the transformer core during operation with a turned and loosened core. Conclusions from the measurement results were drawn on the basis of the parametric test of significance derived from the variance analysis for many means of single classification basing on the Fisher-Snedecor F-distribution.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1299-1302
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of Acoustic Emission Signals Generated in On Load Tap Changer
Autorzy:
Cichoń, A.
Borucki, S.
Wotzka, D.
Powiązania:
https://bibliotekanauki.pl/articles/1199209.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
The paper deals with mathematical modeling of acoustic emission signals which are generated in on load tap changers. In power engineering area acoustic emission method is commonly used for diagnosis purposes. Authors in their research works apply it for detection of defects occurring in on load tap changers, which are important elements of power transformers. The acoustic emission method is based on measurements performed by use of wideband piezoelectric transducers that are mounted on transformer tank surface. The registered signal is then analyzed in the time, frequency, and time-frequency domains or is evaluated with computer expert systems for diagnosis purposes. Depending on indicators device technical condition can be determined. The contribution given by the authors in this paper is proposal of a mathematical model, which describes envelope of the measured acoustic emission signal.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1396-1399
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solving a Set of Spherical Equations for Localization of Partial Discharges by Acoustic Emission Method
Autorzy:
Boczar, T.
Witkowski, P.
Borucki, S.
Cichoń, A.
Powiązania:
https://bibliotekanauki.pl/articles/1401873.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
This article deals with the subject matter of improvement of the acoustic emission methods used for location of partial discharges, which may occur inside power transformer insulation systems. Analytical solutions of spherical equations for location of partial discharge generation using the acoustic method were shown in detail. Presented in the article method of solving the assumed equations is based on the analytical method and matrix notation. Theoretical considerations and later the measurement-based verification refer to the use of the triangulation method for location of the occurrence of partial discharges. The results of the scientific and research works that have been presented in this article are the next stage of research aimed at development of on-line diagnosis system for insulation systems of electrical equipment, allowing for detection, measurement and identification of forms and locations of partial discharges using the acoustic emission method.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 299-305
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostics of the Core Mechanical Construction Based on Vibroacoustic Measurements and Distribution of Temperature Field in Transformer Magnetic Circuit
Autorzy:
Borucki, S.
Cichon, A.
Boczar, T.
Powiązania:
https://bibliotekanauki.pl/articles/1401874.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
Subject matter of this article concerns the results of research works on the development and use of the vibroacoustic method to evaluate technical state of transformer cores. The article presents obtained measurement results of transformer mechanical vibration for two cases of its operation: with twisted and loosened core. In order to demonstrate negative effects of operating a transformer with a loosened core, this publication presents thermographic images showing temperature distribution on its magnetic core. The article characterises the examined transformer, employed measurement system and methodology of the completed experiment. The vibroacoustic and thermographic measurements were carried out during idle work of the transformer. Core vibration was registered for three measurement axes: 0X, 0Y and 0Z. Completed tests have proven that loosened screws pressing the core cause evident increase in the value of magnetic core vibration acceleration. At the same time, the temperature rises by more than 25%.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 306-309
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 33

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