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Wyszukujesz frazę "conductivity" wg kryterium: Temat


Tytuł:
Validation of relationship between milk resistance and daily yield of dairy cows
Autorzy:
Wojciechowska, B.
Burmańczuk, A.
Grabowski, T.
Kowalski, C.
Hola, P.
Powiązania:
https://bibliotekanauki.pl/articles/2087885.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
resistance
milk
conductivity
yield
dairy
Źródło:
Polish Journal of Veterinary Sciences; 2017, 4; 737-742
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical calculation of 1D ZRP chain electrical conductivity
Autorzy:
Botman, S.
Powiązania:
https://bibliotekanauki.pl/articles/1940699.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska
Tematy:
conductivity
kinetic equation
numerical computation
Opis:
In this paper we present a numerical procedure for calculation of electrical conductivity in a periodic lattice of one-dimensional zero range potentials with a case of dominant impurity scattering. The conductivity was previously obtained in an integral form via an approximate solution of the kinetic Kolmogorov equation. The proposed approach is based on the quadrature formula for certain type of integrals. The results are compared with the low temperature limit approximation.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2017, 21, 2; 185-192
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical Conductivity and Morphology Study of Polyaniline Powder Synthesised with Various Doping Ions
Autorzy:
Golba, S.
Popczyk, M.
Miga, S.
Jurek-Suliga, J.
Zubko, M.
Powiązania:
https://bibliotekanauki.pl/articles/351230.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
polyaniline
conductive polymers
conductivity
morphology
Opis:
Powdered polyaniline (PANI) was synthesised chemically with different doping anions namely hydrochloric acid, sulphuric acid and para-toluenesulfonic acid (pTSA). Two-step synthetic procedure was utilised at low temperature. The highest reaction efficiency was found for chlorine-doped PANI. Structural characterization with FTIR revealed the vibration bands characteristicto formation of the emeraldine salt. The surface morphology of doped PANIs was studied by SEM images which showed near globular shape and porous structures with different size of the aggregated particles. They were smaller for Cl-- or pTS--doped PANI while for SO4 2- the size was markedly larger. The XRD patterns revealed that there are ordered regions especially for pTS- doped PANI, while the highest conductivity value was recorded for Cl- doped one followed by organic pTS- doped and SO4 2- doped one.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 1023-1028
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ wysokotemperaturowego wygrzewania na właściwości elektryczne nanokompozytu (FeCoZr)81.8(CaF2)18.2
Вплив високотемпературного відпалювання на електричні властивості нанокомпозиту (FeCoZr)81.8(CaF2)18.2
High temperature annealing influence on electric properties of nanocomposite (FeCoZr)81.8(CaF2)18.2
Autorzy:
Bondariev, V.
Koltunowicz, T. N.
Powiązania:
https://bibliotekanauki.pl/articles/408467.pdf
Data publikacji:
2015
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
nanokompozyty
wygrzewanie
konduktywność
nanocomposites
annealing
conductivity
Opis:
Praca przedstawia wyniki badań wpływu wygrzewania na zmiennoprądowe właściwości elektryczne nanokompozytu (FeCoZr)x(CaF2)(100-x) o zawartości fazy metalicznej x = 81,8 at.% wytworzonego metodą jonowo-wiązkowego rozpylania w atmosferze argonu Ar i tlenu O2. Zaobserwowano, że w materiale są dwa rodzaje studni potencjału różniących się czasami relaksacji. Wygrzewanie powoduje zanik maksimów na częstotliwościowej zależności współczynnika częstotliwościowego α oraz wygładzenie odcinków wzrostu konduktywności na sigma(f), co oznacza całkowite utlenienie materiału
В статті наведено результати впливу відпалювання на електричні властивості на змінному струмі нанокомпозиту (FeCoZr)x(CaF2)(100-x), який має металеву фазу х = 81,8 ат.%, утвореного методом іонно-пучкового розпилення в атмосфері аргону Ar і кисню O2. Було виявлено, що в матеріалі є два різновиди студні потенціалу, які відрізняються часом релаксації. Відпалювання призводить до зникнення піків на частотній залежності частотного коефіцієнта α і згладжування діапазону зросту провідності sigma(f), що означає повне окислення матеріалу.
This paper presents results of researches on annealing influence on AC electric properties of nanocomposite (FeCoZr)x(CaF2)(100-x) with metallic phase content x = 81.8 at.% which was produced by ion-beam sputtering in argon Ar and oxygen O2 atmosphere. It was observed that there are two types of potential wells in the material, which are different in relaxation times. Annealing causes maximums disappearance on frequency dependence on frequency coefficient α and growing section smoothing, which means complete oxidation of material.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2015, 4; 70-76
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocomposite Sulfonated PVDF-TiO2 Membranes as a Potential Alternative for Nafion
Autorzy:
Juliandri, Juliandri
Rukiah, Rukiah
Ernawati, E. E.
Handika, R. S.
Nasir, M.
Powiązania:
https://bibliotekanauki.pl/articles/1165508.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
PVDF membrane
conductivity
nanocomposites
titanium oxide
Opis:
Fuel cell is an alternative renewable energy source which potentially able to replace a fossil fuel. Nowadays, common fuel cell membrane generally used is Nafion. PVDF polymer is another synthetic polymer which has excellent physical and chemical properties. The purpose of this research is to synthesize an alternative fuel cell membrane, using sulfonated PVDF doped with TiO2 nanoparticles. Sol-gel method was performed to synthesize TiO2 nanoparticles, with TiCl4 as precursor. PVDF membranes with variation of TiO2 composition (0, 1, 1.5, and 2%) were prepared with ultrasonic method. The composite membranes then were sulfonated with concentrated sulfuric acid. The composite membranes were characterized with FTIR for functional group analysis, SEM-EDX for morphology analysis, acid-base titration for degree of sulfonation, weight difference for degree of water uptake, and four point lines for conductivity. FTIR spectra of the sulfonated membrane show the existence of sulfonic group at wavenumber of 601, 1400, and 1454 cm-1. The result of SEM-EDX analysis shows that the nanoparticles of TiO2 were not distributed homogenously. Degree of sulfonation of the PVDF-TiO2 2% composite membrane is 19.54%, and its water uptake is 23.34%. The highest conductivity is about 3.17 × 10-3 S cm-1 for the PVDF-TiO2 2% composite membrane that is very close to Nafion’s conductivity, 6.08 × 10-3 S cm-1.
Źródło:
World Scientific News; 2018, 107; 150-159
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozpoznanie stref dopływu wody podziemnej do wykopu pod fundamenty nowego budynku ACK CYFRONET AGH w Krakowie z wykorzystaniem metody konduktometrycznej
Application of the ground conductivity meters to finding groundwater leak zones in the foundations of the new-built AKC CYFRONET building, AGH UST, Cracow
Autorzy:
Klityński, W.
Stefaniuk, M.
Cygal, A.
Powiązania:
https://bibliotekanauki.pl/articles/2075384.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
przewodność
woda zmineralizowana
wyciek wody
strefy dopływu wody
conductivity
mineralized water
water leakage
ground conductivity meters
Opis:
Electrical conductivity is used in the study of fresh-water and/or mineralized water outflow zones. Conductivity of water is relatively low. It strongly depends on its salinity and mineralization. Increased salinity and mineralization of water give rise to conductivity growth of hydrogeological medium. Finding water leak zones is an important problem during planning any building works. The influence of water on the building can be disadvantageous (elution, destruction of the foundations and sulfate aggressiveness). Because of high conductivity of water, watered zones can be recognized with the use of electromagnetic methods. The paper presents results of examination of mineralized water leak zones on the building site of the new CYFRONET building in the Ruczaj quarter, Cracow, Poland. The examinations were conducted with the use of ground conductivity meters. The main goal of the research was to find mineralized water leakage under the foundations of the new-built building.
Źródło:
Przegląd Geologiczny; 2015, 63, 10/1; 814--819
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of mesh quality on the numerical estimation of saturated water conductivity of pore media
Autorzy:
Gackiewicz, B.
Lamorski, K.
Slawiński, C.
Hsu, S.-Y.
Chang, L.-C.
Powiązania:
https://bibliotekanauki.pl/articles/2082923.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
porous media
numerical modelling
hydraulic
conductivity
mesh accuracy
Opis:
The numerical modelling of transport phenomena in porous media often requires a compromise between grid precision and the accuracy of simulation results. This study demonstrates the impact of errors on the accuracy of the reproduction of the actual pore space by the numerical grid on the estimated values of the saturated water conductivity. Four types of computational grids with varying levels of complexity were prepared for each of the 12 tomographic images of the porous specimens. The specific surfaces and total porosities were calculated for each of the meshes and compared with those parameters calculated for binarized tomographic images. Simulations of steady flow were performed on the computational grids, and the saturated water conductivity values were calculated. It has been shown that an insufficiently accurate mesh only reproduces the largest pore spaces in the analysed sample, which most often leads to an underestimation of the water conductivity coefficient. The following criterion for the optimal accuracy of the computational grid is proposed, it is based on the voxel size of the tomographic images of the porous media: the minimum size of the cell in the mesh used for simulations has to be at most two times the size of the voxel used in the tomographic scans of the porous medium.
Źródło:
International Agrophysics; 2020, 34, 4; 473-483
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badanie korelacji właściwości elektrycznych i magnetycznych wybranych materiałów paramagnetycznych
Checking of the correlation of electrical and magnetic properties of selected paramagnetic materials
Autorzy:
Piaskowy, A.
Skórkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/156750.pdf
Data publikacji:
2014
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
paramagnetyki
przenikalność magnetyczna
konduktywność
paramagnetic
magnetic permeability
conductivity
Opis:
W artykule przedstawiono wyniki badań właściwości elektrycznych oraz magnetycznych materiałów charakteryzujących się niewielką podatnością magnetyczną. Opisano układy oraz metody pomiaru zarówno przenikalności magnetycznej jak również konduktywności takich materiałów. W podsumowaniu zawarto wnioski wyciągnięte z badania korelacji właściwości elektrycznych i magnetycznych.
The characteristic feature of paramagnetic materials is very small value of the magnetic permeability, very close to unity, so a reliable measurement is not a typical issue. Measurement circuit, presented in the article, allows measure both active and reactive components of the induced voltage in the winding of the detection coil, wherein the sample material is placed. The measurement procedure is two-step, first the reactive component of induced voltage is measured at the terminals of the detection coil with the sample, and second without the sample, and based on the determined values the permeability is calculated. The article presents results of several samples of selected paramagnetic materials. Studies include both permeability and conductivity of those materials. Attempted to correlate occurred magnetic permeability of tested material with its conductivity. The summary contains conclusions based on tested properties. Further research will involve an correlation attempt of the active component of the voltage induced in the detection coil of the present measuring system (Fig. 1) with the electrical properties of the sample.
Źródło:
Pomiary Automatyka Kontrola; 2014, R. 60, nr 11, 11; 1010-1012
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Potential of Sisal Fibre as an Additive in Lightweight Foamed Concrete for Thermal Properties Enhancement
Autorzy:
Mydin, Md Azree Othuman
Powiązania:
https://bibliotekanauki.pl/articles/2201770.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
foamed concrete
thermal properties
conductivity
diffusivity
specific heat
Opis:
Lightweight foamed concrete (LFC) is extremely permeable, and its thermal properties reduce with rising in the number of voids. In turn, to improve its thermal properties, the solid matrix of LFC can be adjusted by incorporating several natural fibers. The influence of sisal fiber in LFC was not investigated before in the current body of knowledge. Hence, there is some ambiguity considering the mechanism by which and the extent to which the sisal fiber can influence LFC thermal properties. Hence, this study concentrates on distinguishing the potential use of sisal fiber in LFC. The purpose of this research is to determine LFC's thermal characteristics when sisal fiber is added. Casting and testing of densities of 800 kg/m3 and 1600 kg/m3 were done. Various weight fractions were employed pertaining to sisal fiber, i.e., 0.15%, 0.30%, 0.45% and 0.60%. The components of thermal properties, which consist of specific heat, thermal conductivity as well as thermal diffusivity were evaluated. To get comparable results, we fixed the water to cement ratio as 0.45 while keeping constant the cement to sand ratio at 1:1.5. It was seen that optimum results were achieved with the addition of 0.45% of sisal fiber with regard to all the thermal characteristics regarded in this exploration. At 0.45% weight fraction about sisal fiber, maximum compaction was achieved with fibers as well as the cementitious matrix, which ensued in good mix uniformity. Beyond the optimum level pertaining to the presence of sisal fiber, it could be seen that fibers would agglomerate and exhibit non-uniform dispersion, which resulted in a decline with regards to the entire thermal characteristics assessed.
Źródło:
Advances in Science and Technology. Research Journal; 2022, 16, 3; 89--97
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soil physical properties affected by biochar addition at different plant phaenological phases. Part II
Autorzy:
Mako, A.
Barna, G.
Horel, A.
Powiązania:
https://bibliotekanauki.pl/articles/2082863.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
biochar
aggregate size distribution
hydraulic
conductivity
bulk density
Opis:
A great emphasis has been placed on biochar addition to soils to improve its physical, chemical, and biological properties in recent times in order to achieve improved crop growth and yields. The present study explored to soil physical changes through different plant growth stages caused by biochar addition to silt loam soil in a pot-experiment. Our research focused on changes in soil bulk density, aggregate size distribution, and saturated hydraulic conductivity. The soils were amended with different amounts of biochars (control with 0, BC0.5 with 0.5%, BC2.5 with 2.5%, and BC5.0 with 5.0% biochar, by weight). Capsicum annuum L. were planted at a two-four leaf stage. Soil samples were taken at 6, 10 and 12 weeks after planting. The biochar amendment resulted in a significant decrease in soil bulk density values. Soil saturated hydraulic conductivity values ranged between 5.5 and 7.9 times higher for all treatments compared to the controls.
Źródło:
International Agrophysics; 2020, 34, 1; 1-7
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The conductivity of the milk kefir model reduced by enzymatic hydrolysis of lactose content
Konduktywność modelowych kefirów z mleka o obniżonej na drodze hydrolizy enzymatycznej zawartości laktozy
Autorzy:
Kaczyński, Ł. K.
Bierzuńska, P.
Cais-Sokolińska, D.
Powiązania:
https://bibliotekanauki.pl/articles/270893.pdf
Data publikacji:
2016
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
conductometry
conductivity
lactose-free milk
konduktometria
konduktywność
mleko bezlaktozowe
Opis:
Measurements of electrical values reflect the dynamics for development of lactic acid bacteria. They may be, in addition to pH measurement, a tool for a technologist to monitor the fermentation process and changes taking place in the finished product, in which the microflora is still active. It was stated that with lapse of fermentation time, the conductivity of each sample of milk that has undergone the souring process increased by 1.5 times. The values of direction coefficients for the linear distribution are consistent with the dynamics of pH changes for kefirs during their production. After 24 hours of fermentation, pH for samples of this milk was 4.42, and the conductivity – 7.213 Ωˉ³·cm¹. Measurement of conductivity of processed milk with the lactose content of 4.7% and less than 0.01% reflects the dynamics of the souring process.
Pomiary wielkości elektrycznych odzwierciedlają dynamikę rozwoju bakterii kwasu mlekowego. Stanowić mogą, obok pomiaru pH, narzędzie dla technologa w monitorowaniu procesu fermentacji i zmian zachodzących w gotowym produkcie, w którym mikroflora nadal pozostaje aktywna. Stwierdzono, że wraz z upływem czasu fermentacji konduktywność każdej z próbek mleka poddanego ukwaszeniu zwiększyła się 1,5-krotnie. Wartości współczynników kierunkowych rozkładu liniowego są zbieżne z dynamiką zmian pH kefirów podczas ich wytwarzania. Po 24 h fermentacji pH próbek tego mleka wyniosło 4,42, a konduktywność 7,213 Ωˉ³·cm¹. Pomiar konduktywności przerabianego mleka o zawartości laktozy 4,7% i mniej niż 0,01% stanowi odzwierciedlenie dynamiki procesu ukwaszania
Źródło:
Aparatura Badawcza i Dydaktyczna; 2016, 21, 2; 102-105
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The electrical-generating structure based on NiPc in ammonia medium
Struktura z wewnętrzną barierą potencjału oparta na warstwie NiPc w środowisku amoniaku
Autorzy:
Hotra, Z.
Volynyuk, D.
Bakhmatyuk, B.
Kostiv, N.
Voznyak, L.
Powiązania:
https://bibliotekanauki.pl/articles/159357.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Tematy:
półprzewodnik organiczny
amoniak
konduktywność
organic semiconductor
ammonia vapors
conductivity
Opis:
In this work we presented a result of structural and electrophisical investigation of electrical-generating barrier structure based on organic semiconductor NiPc. It was studied the current-voltage and impedance characteristics of structure ITO/NiPc/Al under the influence of ammonia vapors and was revealed the current and conductivity increase of structure in ammonia medium. Also we modeled impedance characteristics using the Constant Phase Element CPE what shows that the change in resistance occurs as a result of a chemical interaction.
W pracy przedstawiono wyniki badań dotyczących strukturalnych elektrofizycznych własności bariery generującej napięcie elektryczne opartej na półprzewodniku organicznym NiPc. Przebadane zostały charakterystyki prądowo-napięciowa i impedancyjna struktur ITO/NiPc/Al umieszczonych w amoniaku. Wykazano, że dzięki zastosowaniu amoniaku, wzrasta natężenie prądu i konduktywność całej struktury. W dalszej części zamodelowano charakterystykę impedancyjną używając elementów o stałej fazie (ang. CPE), co udowodniło, że zmiany rezystancji pojawiają się w wyniku reakcji chemicznej.
Źródło:
Prace Instytutu Elektrotechniki; 2010, 247; 5-11
0032-6216
Pojawia się w:
Prace Instytutu Elektrotechniki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frequency domain electromagnetic and electrical resistivity geophysical investigation of tar sands deposits in the Ijebu Waterside area, Eastern Dahomey Basin, southwestern Nigeria
Autorzy:
Osinowo, Olawale Olakunle
Okechukwu, Ifeayinchukwu
Powiązania:
https://bibliotekanauki.pl/articles/2055851.pdf
Data publikacji:
2021
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
frequency domain electromagnetic survey
conductivity
electrical resistivity
tar sands
Opis:
The use of electromagnetic conductivity and electrical resistivity geophysical techniques has been employed in this study to investigate the occurrence, thickness, and spatial distribution of bitumen deposit around Makun-Omi in the Ijebu Waterside area of southwestern Nigeria. Subsurface apparent conductivity distribution data obtained using Geonic 34-3 equipment along fifteen traverses which sounded from different depths of 7.5, 15, 30 and 60 m at inter-coil separation of 10, 20 and 40 m in vertical and horizontal coupling modes and ground resistivity distribution measurements, obtained using Geopulse Tiger Allied resistivity meter at fourteen Vertical Electrical Sounding (VES) stations, were processed and employed to characterize the subsurface in terms of tar sands distribution. The conductivity and resistivity distribution in the form of a 3D earth model, iso-depth maps, 2D sections generated from the processed conductivity and resistivity data indicate relatively low conductivity <20 mS/m and high resistivity >1300 Ωm values around tar/bitumen impregnated sands which mostly occurred in the southern part of the study area. Clearly defined conductivity and resistivity anomalies which delineate the lateral and vertical occurrence of tar impregnated sands underscore the efficacy of integrating electromagnetic and electrical resistivity geophysical techniques to identify occurrence of economic deposits of tar sands in parts of southwestern Nigeria.
Źródło:
Geology, Geophysics and Environment; 2021, 47, 4; 217--226
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication of a Novel Silver-Based Electrical Contact Composites and Assessment of Its Mechanical and Electrical Properties
Autorzy:
Kumar, Praveen S.
Senthil, S. M.
Parameshwaran, Rathinasamy
Rathanasamy, Rajasekar
Powiązania:
https://bibliotekanauki.pl/articles/2049131.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silver tin oxide
electrical contact
composites
tungsten oxide
conductivity
Opis:
The electrical contactors play a crucial role in closing the circuit in many power distribution components like overhead lines, underground cables, circuit breakers, transformers, and control systems. The failure in these components mainly occurs due to the break-down of contactors due to the continuous opening and closing action of contacts. Silver (Ag)-based oxide contact materials are widely used in practice, among which silver tin oxide (AgSnO2) is most common. An attempt is made in increasing the performance of AgSnO2, by adding Tungsten Oxide (WO3) in various weight proportions, thus finding the optimal proportion of AgSnO2WO3 to have increased mechanical and electrical performances. All the composite samples are fabricated in-house using powder metallurgy process. The assessment of physical and electrical properties namely, density, hardness, porosity, and electrical conductivity, showed that 90%Ag-8.5%SnO2-1.5%WO3 composite yielded superior results. With help of morphological tests, wear characteristics are also investigated, which showed that 90%Ag-8.5%SnO2-1.5%WO2 composite has a wear coefficient of 0.000227 and a coefficient of friction of 0.174 at an optimized load of 10 N and sliding velocity of 0.5 mm/s.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 1087-1094
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of a Method for Measuring Deposit Impedance Parameters Using Charge Amplifier and Lock-in Voltmeter
Autorzy:
Wiśniewski, Dariusz R.
Powiązania:
https://bibliotekanauki.pl/articles/2069749.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
impedance
conductivity
moisture content
deposit
charge amplifier
lock-in voltmeter
Opis:
Methods for measuring deposit parameters are often based on a capacitance or conductivity measurement aimed at estimating, e.g. deposit moisture content. In practice, these methods fail for materials with a low degree of homogeneity, a diverse porous structure or high conductivity, e.g. due to a high water content. This article demonstrates an approach that enables a more precise estimation of the parameters of any deposit. The presented method involves the use of a measuring system in a charge amplifier configuration and the application of a technique using lock-in detection or a lock-in voltmeter to determine resistance and capacitance parameters of a deposit based on signals received from the measuring system. This method can be successfully used wherever the test deposit material is highly heterogeneous and contains both dielectric and conductive materials. The article presents an example of a solution to a measuring system using two planar electrodes that can be dimensioned depending on the deposit dimensions. It is followed by a presentation of a method for converting the signal from the measuring system into impedance parameters of the deposit using a lock-in voltmeter. The analysis of the operation of the entire measuring system was modelled in Matlab/Simulink, and the operation results were presented.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2021, 24(1); 67--81
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł

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