Wyniki wyszukiwania - Biblioteka Nauki

1

Investigation of the lithuanian national standard of electric resistance

100%

Bartašiunas A. , Miškinis R. , Smirnov D. , Urba E. , Bartašiunas A. , Miškinis R. , Smirnov D. , Urba E.

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2

Investigation of the Lithuanian national standard of electric resistance

100%

Bartašiūnas A. , Miškinis R. , Smirnov D. , Urba E.

Metrology and Measurement Systems

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2020

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tom Vol. 27, nr 4

615--624

EN

The Lithuanian national standard of electric resistance is maintained as the basis for calibration and measurement capabilities published in the key comparison database of the International Bureau of Weights and Measures (BIPM). The stability and uncertainty of the resistance value measurements, performed since 2004 using the calibrated values of the standard resistors to predict their future behaviour as well as influence of environmental conditions, are discussed. Also discussed is the recovery of a standard resistor which had undergone a mechanical disturbance. It is concluded that the standard resistors operated by the Lithuanian National Electrical Standards Laboratory feature stable drift of resistance, which is well predicted by means of linear regression.

3

Oporność elektryczna wyrobów węglowych w świetle badań metodą czteropunktową i według Polskiej Normy

100%

Czosnek C. , Bojkowski M. , Długosz A.

Karbo

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2001

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tom Nr 7-8

254-256

PL

Przedstawiono wyniki badań właściwości elektrycznych materiałów węglowych, wyprodukowanych na bazie elektrografu, oceniane różnymi metodami. Uzyskane wyniki wskazują na znaczne możliwości oceny jednorodności materiału węglowego za pomocą metody czteropunktowej.

EN

The results of investigations have been presented on electric properties of carbonic materials produced on the basis of electrographite assessed by various methods. The results obtained indicate to meaningful possibilities of homogeneity of carbonic material with the use of a four-point method.

4

Biomedyczne urządzenie do monitorowania zmian rezystancji skóry

100%

Jagielnicki R.

Pomiary Automatyka Kontrola

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2010

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tom R. 56, nr 12

1568-1570

PL

W referacie przedstawiono, współpracujące z komputerem personalnym, urządzenie elektroniczne do pomiaru, rejestracji i wizualizacji aktywności elektrodermalnej. Zaprezentowano część sprzętową urządzenia - tor przetwarzania i wstępnej obróbki sygnału pomiarowego. Interfejs użytkownika to profesjonalna aplikacja wykonana w środowisku LabView umożliwiająca prowadzenie eksperymentu z poziomu konsoli komputera personalnego. Szczegółowo omówiono wpływ czynników zakłócających w egzosomatycznej metodzie pomiaru aktywności elektrycznej skóry.

EN

A device used for electronic measurements, registration and visua-lization of electrodermal activity of the skin is described in the paper[1, 2, 4]. This biomedical electronic device is a modern recorder of some exosomatic changes (Section 1) of the skin parameters with possibility of choice of the measured value - electric resistance or conductance (Fig. 5). The equipment part of the device is presented - the channel of processing and preprocessing of a measuring signal (Section3, Figs. 3, 4). The user interface is the professional application executed in the LabView environment enabling carrying out the experiment on a personal computer console (Fig. 5). The process of measurement includes both evaluation of a selected physical quantity as well as visualization of changes of the measured time-variable quantity magnitude, that is illustration of phase and tonic activity [1, 3]. For the phase activity there can be determined: the reaction amplitude, latency, the rise and recovery time of the response curve. For the tonic activity the device enables recording unspecific fluctuations that is changes without presence of a clear external stimulus (Fig. 5). The influence of the interfering factors in measurements of skin electric activity by the exosomatic method is discussed in detail (Section 3).

5

The influence of the forming methods of graphitoidal electrodes upon their anisotropy of the electric resistance and texturing

84%

Metallurgy and Foundry Engineering

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1998

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tom T. 24, no. 3

201--207

EN

The way of measuring of the electric resistance with the usage of Van der Pauw's method was presented. The subject of the research were electrodes formed by extrusion and by the vibratory method. The texturizing degree of the electrodes and the simplified anisotropy index were calculated on the basis of results of the x-ray structural analysis on the surfaces of the sampIes from these electrodes. On the same surfaces the electric re si stance was measured as well. The x-ray structural examinations of the electrode formed by extrusion proved its significant texturing, the consequence of which was a remarkable anisotropy of electric resistance. Electric resistance measured paralelly to the electrode's axis was much smaller than the one measured perpendicularly. The results of x-ray structural examinations of the electrode formed by the vibratory method proved the lack of its texturing. Moreover, there was not observed any anisotropy of electric resistance on this electrode. The research proved the existing correlation between texturing of the electrode and its electric resistance. They also confirmed the usefulness of Van der Pauw' s method in measuring the electric resistance and in evaluating the anisotropy of electric conductivity in graphitoidal products.

PL

Omówiono sposób pomiaru oporności elektrycznej metodą Van der Pauw'a, Przedmiotem badań były elektrody formowane w prasie przelotowej i metodą wibracyjną. Stopień steksturowania elektrod i umowny wskaźnik anizotropii obliczono na podstawie wyników badań rentgenostrukturalnych próbek pobranych z elektrod. Na tych samych powierzchniach zmierzono oporność elektryczną. Badania rentgenostrukturalne elektrody prasowanej przelotowo wykazały znaczne jej steksturowanie, czego konsekwencją była znaczna anizotropia oporności elektrycznej. Oporność elektryczna mierzona równolegle do osi elektrody była znacznie mniejsza niż mierzona w kierunku prostopadłym. Wyniki badań rentgenostrukturalnych elektrody formowanej wibracyjnie wykazały brak jej steksturowania. Nie stwierdzono również anizotropii oporności elektrycznej tej elektrody. Badania wykazały istnienie korelacji między steksturowaniem elektrody, a jej opornością elektryczną. Potwierdziły również przydatność metody Van der Pauw'a do pomiaru oporności elektrycznej i oceny anizotropii przewodnictwa elektrycznego wyrobów grafitowych.

6

Influence of the production parameters on the properties of the sinters made from displaced copper powders.

67%

Leżański J. , Gacek S. , Radoń A. , Olszewska I.

Inżynieria Materiałowa

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1998

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tom R. XIX, nr 4

1203-1205

EN

In this paper the production parameters influence on the properties of sinters made from copper powder which are obtained on the first stage of hydrometallurgical processing by displacing from copper fire scale, are presented. Pressed powder compacts density and sinters density were investigated. Also sinters bending strength, hardness, electric resistance were measured and sinters structure was observed and analysed. In described experiment sinters with very high properties were obtained and this indicate high suitability of the use of hydrometallurgical copper powders for application in powder metallurgy technology.

7

Simple modeling approach for line impedance of on-chip CMOS interconnects

51%

Ymeri H. , Nauwelaers B. , Maex K.

Journal of Technical Physics

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2004

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tom Vol. 45, no 1

71-77

EN

Simple and accurate closed-form model enabling to calculate frequency-dependent distributed inductance and associated distributed series resistance per-unit-length of single on-chip interconnects on a lossy silicon substrate is presented. The closed-form formulas for the frequency-dependent series impedance parameters are obtained using a closed-form integration method and the vector magnetic potential equation. The proposed frequency-dependent inductance -L(omega) and resistance R(omega) per-unit-length formulas are shown to be in good agreement with the electromagnetic solutions.