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Wyświetlanie 1-15 z 29
Tytuł:
Soil mechanical resistance measurement by an unique multi-cone tips horizontal sensor
Autorzy:
Sharifi, A.
Mohsenimanesh, A.
Powiązania:
https://bibliotekanauki.pl/articles/25550.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
soil resistance
mechanical resistance
measurement
multi-cone tips horizontal sensor
horizontal penetrometer
Opis:
Amulti-tips horizontal sensor was developed and mounted horizontally on a tine face by shafts. The length of shafts was reduced from top to down the tine. The developed system was evaluated in the controlled soil bin laboratory conditions with clay loam soil and uniform soil moisture content. The experiment was designed with soil compaction at three levels of uniform and nonuniform soil compaction in completely randomized block design with four replications. Vertical standard penetrometer was also used to compare with horizontal sensor data at whole working depth of 0 to 400 mm. The results indicated that there is a correlation with R2 = 0.86 between soil cone penetrometer values and the horizontal soil mechanical resistance measurement system data. It can be concluded that the idea of reducing the length of the tips from top to down the tine face would give promising results.
Źródło:
International Agrophysics; 2012, 26, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Contactless method for resistance measurement of ultra-thin printed and conductive lines
Autorzy:
Szybiński, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/220707.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inkjet printing electronics
resistance measurements
micrometer conducting lines
contactless method
resonance circuits
Opis:
In this paper the problem of resistance measurement of ultrathin conductive lines on dielectric substrates dedicated for printing electronic industry is discussed. The measured line is transformed in a non-invasive way into a resonance circuit. By using a magnetic coupling between the source line and the tested line, the resistance measurement can be performed non-invasively, i.e. without a mechanical contact. The proposed contactless resistance measurement method is based on the resonance quality factor estimation and it is an example of the inverse problem in metrology.
Źródło:
Metrology and Measurement Systems; 2020, 27, 3; 427-439
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of wrongly assumed probability distribution on the uncertainty of resistance measurement by technical method
Autorzy:
Szczesny, Stanisław
Golijanek-Jędrzejczyk, Anna
Świsulski, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/377954.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
uncertainty of measurement
technical method
measurement of resistance
Opis:
The paper presents studies on the influence of probability distributions on the expanded uncertainty of the resistance measurement. Choosing the correct probability distribution is very important to estimate of measurement uncertainty. The most commonly used distribution is the rectangular distribution. The paper presents the results of analysis of the resistance measurement uncertainty using the technical method of two resistances: 1 Ω and 100 GΩ using different measuring equipment. The analysis of the uncertainty measurement of resistance was carried out repeatedly, each time assuming a different probability distribution of measuring instruments (normal, rectangular, triangular or trapezoidal). The results of the research presented in the article show that the influence of the assumed probability distributions on the result of the measurement uncertainty analysis is significant and results discrepancies can reach up to 30%.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2019, 100; 63-73
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methodology of heat transfer and flow resistance measurement for matrices of rotating regenerative heat exchangers
Autorzy:
Butrymowicz, D.
Karwacki, J.
Kwidziński, R.
Śmierciew, K.
Gagan, J.
Przybyliński, T.
Skiepko, T.
Łapin, M.
Powiązania:
https://bibliotekanauki.pl/articles/185740.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat transfer
single blow technique
rotating heat exchanger
regenerator
przenikania ciepła
wymiennik ciepła
Opis:
The theoretical basis for the indirect measurement approach of mean heat transfer coefficient for the packed bed based on the modified single blow technique was presented and discussed in the paper. The methodology of this measurement approach dedicated to the matrix of the rotating regenerative gas heater was discussed in detail. The testing stand consisted of a dedicated experimental tunnel with auxiliary equipment and a measurement system are presented. Selected experimental results are presented and discussed for selected types of matrices of regenerative air preheaters for the wide range of Reynolds number of gas. The agreement between the theoretically predicted and measured temperature profiles was demonstrated. The exemplary dimensionless relationships between Colburn heat transfer factor, Darcy flow resistance factor and Reynolds number were presented for the investigated matrices of the regenerative gas heater.
Źródło:
Chemical and Process Engineering; 2016, 37, 3; 341-358
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Implementation of a Compact Smart Resistive Sensor Based on a Microcontroller with an Internal ADC
Autorzy:
Czaja, Z.
Powiązania:
https://bibliotekanauki.pl/articles/221453.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
microcontrollers
resistance measurement
ADC
time-domain measurements
Opis:
In the paper a new implementation of a compact smart resistive sensor based on a microcontroller with internal ADCs is proposed and analysed. The solution is based only on a (already existing in the system) microcontroller and a simple sensor interface circuit working as a voltage divider consisting of a reference resistor and a resistive sensor connected in parallel with an interference suppression capacitor. The measurement method is based on stimulation of the sensor interface circuit by a single square voltage pulse and on sampling the resulting voltage on the resistive sensor. The proposed solution is illustrated by a complete application of the compact smart resistive sensor used for temperature measurements, based on an 8-bit ATxmega32A4 microcontroller with a 12-bit ADC and a Pt100 resistive sensor. The results of experimental research confirm that the compact smart resistive sensor has 1°C resolution of temperature measurement for the whole range of changes of measured temperatures.
Źródło:
Metrology and Measurement Systems; 2016, 23, 2; 225-238
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An automatic system for measurement of impedance active component using a quasi-balanced method
Autorzy:
Barwinek, S.
Cichy, A.
Powiązania:
https://bibliotekanauki.pl/articles/114468.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
virtual instruments
LabVIEW
capacitance measurement
impedance measurement
resistance measurement
phase shift measurement
Opis:
The paper presents the idea of the possibility of implementing automatic virtual instrument using the quasi ˗ balanced method to measure the active component of impedance (resistance). The system is based on the structure of a non-bridge quasi-balanced circuit. The process of balancing is automatically performed. This meter has been built based on the data acquisition board NI USB-6251 from National Instruments and programming environment LabVIEW. Signal processing is made in an algorithmic way. The measurement of the phase angle is based on short-term Fourier transform. The results of preliminary experimental research are presented in the paper.
Źródło:
Measurement Automation Monitoring; 2015, 61, 5; 132-135
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An AC measurement system for use with resistive temperature sensors
Autorzy:
Rybski, R.
Walkowiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/114103.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
AC resistance thermometry
resistance ratio measurement
complex voltage ratio
Opis:
In the paper, a measurement system based on a universal commercial measuring module of alternating current for accurate temperature measurement by means of resistive temperature sensors is described. There are presented the research results on the basis of which the metrological properties of the system were evaluated. It was shown that this relatively simple measurement system is a competitive solution compared with the most accurate commercial DC measurement systems.
Źródło:
Measurement Automation Monitoring; 2016, 62, 8; 259-261
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Humidity Migration in Surface Layers of Sand Moulds During Processes of Penetration and Drying of Protective Coatings
Autorzy:
Jamrozowicz, Łukasz
Zych, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/2203936.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface layers
sand mould
porous medium
humidity migration
protective coatings
resistance measurement
warstwy powierzchniowe
formy piaskowe
migracja wilgoci
powłoki ochronne
pomiar rezystancji
Opis:
The results of investigations of humidity migration in near surface layers of sand mould during processes of penetration and drying of protective coatings are presented in the hereby paper. The process of the humidity exchanging between surroundings and moulding sands as porous materials, is widely described in the introduction. In addition, the humidity flow through porous materials, with dividing this process into stages in dependence of the humidity movement mechanism, is presented. Next the desorption process, it means the humidity removal from porous materials, was described. Elements of the drying process intensity as well as the water transport mechanisms at natural and artificial drying were explained. The innovative research stands for measuring resistance changes of porous media due to humidity migrations was applied in investigations. Aqueous zirconium coatings of two apparent viscosities 10s and 30s were used. Viscosity was determined by means of the Ford cup of a mesh clearance of 4mm. Coatings were deposited on cores made of the moulding sand containing sand matrix, of a mean grain size dL = 0.25 mm, and phenol-formaldehyde resin. Pairs of electrodes were placed in the core at depths: 2, 3, 4, 5, 8, 12 and 16 mm. Resistance measurements were performed in a continuous way. The course of the humidity migration process in the core surface layer after covering it by protective coating was determined during investigations. Investigations were performed in the room where the air temperature was: T = 22 oC but the air humidity was not controlled, as well as in the climatic chamber where the air temperature was: T =35 oC and humidity: H = 45%. During the research, it was shown that the process of penetration (sorption) of moisture into the moulding sand is a gradual process and that the moisture penetrates at least 16 mm into the sand. In the case of the drying (desorption) process, moisture from the near-surface layers of the moulding sand dries out much faster than moisture that has penetrated deeper into the sand.
Źródło:
Archives of Foundry Engineering; 2022, 22, 4; 72--78
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Use of Resistance Sensors to Measurement of Shape Charge Parameters
Autorzy:
Wiśniewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/358447.pdf
Data publikacji:
2011
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
sensors
shape charge
explosives
shape charge jet
Opis:
In the article different methods of measurement of the collapsing liner parameters and the formation of the shape charge jet by resistance sensor which was placed inside the shape charge are presented. The speed and acceleration change while reducing of resistance sensor length for shape charge in casing and without it for the different angles of the shape charge liner is analyzed. The resistance sensor placed in the shape charge liner permitted to register the parameters which cannot be obtained by the X-ray impulse apparatus. By the resistance sensor placed at the angle to the shape charge axis or perpendicular to the internal surface of the shape charge liner, the reducing shape charge liner parameters were registered. The resistance sensor placed on the shape charge axis enabled to register the parameters of the jet forming in the shape charge. In case of placing of resistance sensor on shape charge casing, the graphs become more stable in comparison with the graphs obtained when resistance sensor was placed inside shape charge.
Źródło:
Central European Journal of Energetic Materials; 2011, 8, 2; 131-141
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiplicative method for reduction of bias in indirect digital measurement result
Autorzy:
Muravyov, S. V.
Zlygosteva, G. V.
Borikov, V. N.
Powiązania:
https://bibliotekanauki.pl/articles/221726.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bias
error reduction technique
shunt ohmic resistance
indirect measurement
Opis:
The error reduction technique, based on inverse transformation, for a shunt active resistance measurement using an ammeter and voltmeter is considered. When computing a corrected reading only multiplicative operations on two measurement results are used, namely squaring and division. The proposed method allows to increase resistance measurement accuracy by about two orders of magnitude what has been validated by both theoretical and experimental outcomes.
Źródło:
Metrology and Measurement Systems; 2011, 18, 3; 481-489
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of complex resistance parameters by the method of coordinate system displacement on current
Pomiary parametrów składowych impedancji metodą przesunięcia systemu współrzędnych według prądu
Autorzy:
Hrybok, M.
Powiązania:
https://bibliotekanauki.pl/articles/155030.pdf
Data publikacji:
2006
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
parametry impedancji
mierniki
wzorcowanie
metody algorytmiczne
complex resistance parameter
measurement
calibration
algorithmic methods
Opis:
Possibility of complex resistance parameter measurement within a frequency range by the method of coordinate system displacement on current components is investigated.
W pracy zbadano możliwości pomiaru parametrów impedancji metodą przesunięcia systemu współrzędnych według prądu w wybranym zakresie częstotliwości.
Źródło:
Pomiary Automatyka Kontrola; 2006, R. 52, nr 12, 12; 53-57
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of a commercial high resistance bridge and methods to improve its precision
Autorzy:
Mihai, Iulian
Capra, Pier Paolo
Galliana, Flavio
Powiązania:
https://bibliotekanauki.pl/articles/2173898.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high resistance measurements
dual source bridge
DSB
settle-time
measurement uncertainty
compatibility test
measurement noise
Opis:
At the National Institute of Metrological Research (INRIM) an evaluation of a commercial dual source high resistance bridge has been performed. Its two main measurement modes (single measurements and multiple measurements) have been investigated. The best settle time of a 10:1 measurement of high resistance ratio has been estimated to be about three times the time constant of the circuit involving the resistors. This constant, in turn, depends on the highest value resistor. By means of mathematical estimators, suitable numbers of the readings of the detector have been established in order to minimize noises. A compatibility test at 100 TΩ has shown that the best precision of the commercial bridge is achieved utilizing the multiple measurements mode with the auto update function. This mode also allows the characterization of a resistor as a function of the settle time. This characterization can be useful for the owner of the resistor who can request the laboratory to perform the calibration of the resistor with the settle time which is necessary for him.
Źródło:
Metrology and Measurement Systems; 2022, 29, 4; 701--718
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement system for determination of supercapacitor equivalent parameters
Autorzy:
Kopka, R.
Tarczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/221574.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
supercapacitor
measurement system
equivalent series resistance
equivalent capacitance
Opis:
In this paper a measurement system for determination of supercapacitor equivalent parameters is proposed. Specific properties of materials used for supercapacitor construction require some advanced tools and measurement procedures to be applied during tests. The measurement system allows to measure values of equivalent parameters by both the DC and AC method whilst keeping appropriate time criteria required by this type of devices. Furthermore, in this paper the most relevant properties and measurement capabilities of the proposed system are described as well as some exemplary values of the supercapacitor equivalent parameters measured experimentally are presented.
Źródło:
Metrology and Measurement Systems; 2013, 20, 4; 581-590
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Slip Resistance of Industrial Floor Surfaces: Development of an Elastomer Suited to In-Situ Measurement
Autorzy:
Leclercq, S.
Saulnier, H.
Powiązania:
https://bibliotekanauki.pl/articles/91123.pdf
Data publikacji:
2001
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
slip resistance
floor surface
in situ measurement
elastomer
wypadki przy pracy
śliska podłoga
warunki pracy
Opis:
Slips contribute to 12% of occupational accidents. A slip resistant floor is a mean to prevent slipping accidents occurring in workshops. Floor slip resistance is often evaluated by measuring a friction index, proportional to the force opposing slipping of a reference elastomer on the floor surface under test. When implementing a portable appliance, slip resistance measurements carried out on lubricated floors were not stabilized. The authors advanced the hypothesis of oil impregnating the elastomer. A new elastomer suited to in-situ measurement has been developed to achieve stable measuring conditions. This study highlights the fact that the nature and characteristics of a reference elastomer must be specified when slip resistance measurements are carried out.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2001, 7, 1; 93-102
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Lithuanian national standard of electric resistance
Autorzy:
Bartašiūnas, Andrius
Miškinis, Rimantas
Smirnov, Dmitrij
Urba, Emilis
Powiązania:
https://bibliotekanauki.pl/articles/1849159.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
measurement standards
electric resistance
standard resistor
calibration
uncertainty
prediction
Opis:
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.
Źródło:
Metrology and Measurement Systems; 2020, 27, 4; 615-624
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 29

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