Статті в журналах: "Resistance measurement method"

1

Rinkunas, R., and S. Kuskevicius. "Contactless method of resistance measurement." Technical Physics 54, no. 1 (January 2009): 133–37. http://dx.doi.org/10.1134/s1063784209010204.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Lipol, Lefayet Sultan, Mayedul Islam, and Nazrima Sultana. "The Resistance Measurement Method of the Conducting Textiles." European Scientific Journal, ESJ 12, no. 27 (September 30, 2016): 242. http://dx.doi.org/10.19044/esj.2016.v12n27p242.

Повний текст джерела

Анотація:

The report describes the technique to measure the resistance of some novel conducting threads. All of the measurements were performed in the EMC lab at SP Technical Research Institute of Sweden, Boras. The conducting threads were received from Ms. Azadeh Soroudi of the University of Boras. The conducting additive used for the threads was Carbon Black. The resistance was measured using two different methods: The two-terminal measurement method and the four-terminal measurement method. A result from the comparison of the two methods was that the two terminal measurement method provided more information than the fourterminal method. There seemed to be no advantage to use the four terminal method at all, for the resistance range studied.

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Nguyen, V. V., A. A. Shilin, and P. M. Momot. "PLC-based lumber humidity measurement method." Proceedings of the Southwest State University 25, no. 1 (May 30, 2021): 110–21. http://dx.doi.org/10.21869/2223-1560-2021-25-1-110-121.

Повний текст джерела

Анотація:

Purpose or research. The paper considers the solution of the scientific and practical problem of measuring the humidity content of lumber on the basis of a programmable logic controller (PLC), which makes it possible to implement control systems for drying lumber on inexpensive controllers of wide application with the advantages of modern SCADA systems.Methods. To achieve this goal, modern methods for assessing the humidity content of lumber by electrical resistance have been investigated. We have provided a review and analysis of the known dependences of the electrical resistance of lumber on moisture. It is noted the need to measure resistance in the range of 2.5 KΩ to 25 MΩ. The schematic solution for matching a high-resistance measurement bridge with an additional voltage source with a PLC is described here. We have proposed a method for calculating the matching scheme. Expressions are obtained for calculating humidity according to the data of an analog-to-digital converter. The procedure for setting up the measurement channel according to the readings of two reference measurements is presented.Results. The estimation of the measurement error of humidity and resistance is carried out. It is shown that a resistance measurement error of up to 20% leads to a humidity measurement error of up to 1%, provided that the parameters are correctly configured. To set it up, it is enough to take two reference measurements to complete the procedure for setting the humidity measurement parameters.Conclusion. In the process of designing modern systems for drying lumber, you can use the algorithms and programs of the technological process available and well presented in the literature for implementation on the PLC. The article offers a solution to the main problem of measuring the humidity content of lumber, which is necessary for these algorithms and programs. The material can be useful for researching technological stages of the drying process and developing industrial control systems based on inexpensive controllers.

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Mayer, V., D. Vejchar, and L. Pastorková. "Measurement of potato tubers resistance against mechanical loading." Research in Agricultural Engineering 54, No. 1 (March 3, 2008): 22–31. http://dx.doi.org/10.17221/708-rae.

Повний текст джерела

Анотація:

The contribution presents a method for the determination of the potato tubers resistance against mechanical loading, the measurement results obtained with the selected potato varieties, and the comparison of the latter. For testing the potato varieties samples, the method developed in Agrartechnik (ATB) Bornim (Germany) was verified and utilised. The potato samples were exposed to vertical vibrations with adjustable amplitude in the device constructed at the Research Institute of Agricultural Engineering, (RIAE) Prague, for testing tuber samples for mechanical loading. The potato samples cutting pictures were scanned by a web camera or a scanner, and the colour changes on the cuttings were evaluated by means of a computer program. In the paper are presented the results of two different measurements. Significant differences were found between four varieties regarding their resistance against equal mechanical load, and in one variety in different degrees of mechanical load for both early and late potatoes.

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Casans Berga, Silvia, Rafael Garcia-Gil, A. Edith Navarro Anton, and Alfredo Rosado-Muñoz. "Novel Wood Resistance Measurement Method Reducing the Initial Transient Instabilities Arising in DC Methods Due to Polarization Effects." Electronics 8, no. 11 (November 1, 2019): 1253. http://dx.doi.org/10.3390/electronics8111253.

Повний текст джерела

Анотація:

A novel method for measuring the electrical resistance in wood is presented. It is based on applying an Alternating Current (AC) to two electrodes rammed into the wood. The method reduces the transient time for value stabilization. In case of Direct Current (DC) resistance measurement methods, typically used in wood measurement, an initial transient exists, invalidating the measured value during an initial transient period. This measurement method uses an electronic circuit based on a relaxation oscillator where the wood automatically sets the oscillation frequency depending on its electrical resistance. Compared to other AC methods, this circuit greatly simplifies the measurement process, not requiring any previous analysis for wood AC frequency estimation. Experimental results for four different wood species showed that, in all cases, the transient response of the measured wood resistance is improved when compared to the DC resistance method, reducing the stabilization time from 10–12 min in DC measurements to almost zero for the novel measurement method. The deviation between the initial wood resistance measurement and the stable value resulted in a range between 0.2% and 5% with the proposed method, while a range between 6% and 10% was obtained when using the DC method. Moreover, the proposed circuit is able to detect changes in wood resistance produced by small variations in temperature and environmental relative humidity during continuous long term measurements. For repeatability analysis, it was verified that similar ambient conditions of temperature and relative humidity (variations lower than 1 °C and 1%, respectively) in different moments provided variations lower than 1.5%. The method can also be applied to other fiber materials affectd by polarization effects when an electrical current is applied into them.

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Officer, Todd M., Riccardo Pellegrino, Vito Brusasco, and Joseph R. Rodarte. "Measurement of pulmonary resistance and dynamic compliance with airway obstruction." Journal of Applied Physiology 85, no. 5 (November 1, 1998): 1982–88. http://dx.doi.org/10.1152/jappl.1998.85.5.1982.

Повний текст джерела

Анотація:

We compared four algorithms by using least squares regression for determination of pulmonary resistance and dynamic elastance in subjects with emphysema, normal subjects, and subjects with asthma before and after bronchoconstriction. The four methods evaluated include 1) a single resistance and elastance, 2) separate resistances and elastances for each half breath, 3) separate inspiratory and expiratory resistances with a single elastance, and 4) separate inspiratory and expiratory resistances, an expiratory volume interaction term, and a single elastance. All methods gave comparable results in normal and asthmatic subjects. We found expiratory resistance was larger than inspiratory resistance in normal and asthmatic subjects during control conditions, but inspiratory resistance was higher than expiratory resistance in subjects who experienced severe bronchoconstriction in response to methacholine. In subjects who are flow limited, method 2 gives a higher inspiratory resistance than would be computed by assuming that the elastic pressure-volume curve passes through the zero-flow points. Methods 1 and 3 overestimate dynamic elastance and inspiratory resistance. Method 4appears to identify flow limitation and dynamic hyperinflation and gives a good measure of inspiratory resistance and dynamic elastance.

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Zhang, Zhanlong, Hao Wu, Qingzhou Cao, Chen Luo, and Dongping Xiao. "Novel Method for Tower Grounding Resistance Measurement." Electric Power Components and Systems 45, no. 13 (August 9, 2017): 1404–12. http://dx.doi.org/10.1080/15325008.2017.1365102.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Gupta, Rahul P., Robin McCarty, Jim Bierschenk, and Jeff Sharp. "Practical electrical contact resistance measurement method for bulk thermoelectric devices." MRS Proceedings 1490 (2013): 153–59. http://dx.doi.org/10.1557/opl.2012.1730.

Повний текст джерела

Анотація:

ABSTRACTAs thermoelectric (TE) element length decreases, the impact of contact resistance on TE device performance grows more significant. In fact, for a TE device containing 100-μm tall Bi2Te3TE elements, the figure of merit ratio (ZTDevice/ZTMaterial) drops from 0.9 to 0.5 as the contact resistivity increases from 5 x 10-07 to 5 x 10-06 Ω-cm2. To understand the effects of contact resistance on bulk TE device performance, a reliable experimental measurement method is needed. There are many popular methods to extract contact resistance such as Transmission Line Measurements (TLM) and Kelvin Cross Bridge Resistor method (KCBR), but they are only well-suited for measuring metal contacts on thin films and do not necessarily translate to measuring contact resistance on bulk thermoelectric materials. The authors present a new measurement technique that precisely measures contact resistance (on the order of 5 x 10-07 Ω-cm2) on bulk thermoelectric materials by processing stacks of bulk, metal-coated TE wafers using TE industry standard processes. One advantage of this technique is that it exploits realistic TE device manufacturing techniques and results in an almost device-like structure, therefore representing a realistic value for electrical contact resistance in a bulk TE device. Contact resistance measurements for metal contacts to n- and p-type Bi2Te3 alloys are presented and an estimate of the accuracy of the measurements is discussed.

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Shen, Hua Jing. "Measurement of Impulse Grounding Resistance." Advanced Materials Research 546-547 (July 2012): 289–94. http://dx.doi.org/10.4028/www.scientific.net/amr.546-547.289.

Повний текст джерела

Анотація:

A kind of measurement method of impulse grounding resistance is proposed. The measurement method of impulse grounding resistance is also analyzed and discussed theoretically. The hardware and software scheme of measurement system is given. The method of simulation of thunder current and transformation calculation is better than the method of work-frequency measurement by the analysis and comparison. By using the method, the thundering course can not only be simulated , but also the impulse grounding resistance can be calculated directly in the scene. In the end, a simulation result is given. Simulation result show that the method proposed in the paper is effective and feasible.

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Clarke, Robin E., Bahman Shabani, and Gary Rosengarten. "A difference technique to avoid interface errors in measurement of high-conductance thermal insulation." Journal of Building Physics 40, no. 6 (May 23, 2016): 561–78. http://dx.doi.org/10.1177/1744259116637863.

Повний текст джерела

Анотація:

Lower limits of measurement are prescribed within all steady-state test methods for thermal insulation. The limit, typically 0.1 m2 K/W, is largely required because of the increasing significance of interface resistance. We have previously proposed the use of a difference method, in conjunction with flexible buffer materials, to minimize the effects of interface resistance and facilitate measurement of rigid materials below these limits. We have now studied this approach at higher thermal resistances and incorporated a refinement to include a known reference specimen in the difference measurement, which largely eliminates the residual resistance terms. Specimens of expanded polystyrene and cast acrylic were measured in a conventional heat flow meter apparatus using two alternative silicone buffer materials: one solid and the other a sponge. Analysis also included earlier measurements of 12 more highly conducting specimens. Across all of these, thermal resistance values obtained by the difference method were lower between 0.008 and 0.016 m2 K/W, attributable to removing the contribution of interface resistance.

Стилі APA, Harvard, Vancouver, ISO та ін.

11

Górecki, Krzysztof. "Measurements of thermal resistance of power LEDs." Microelectronics International 31, no. 3 (August 4, 2014): 217–23. http://dx.doi.org/10.1108/mi-11-2013-0069.

Повний текст джерела

Анотація:

Purpose – The purpose of this paper is to present a new method of measuring thermal resistance of power light-emitting diodes (LEDs). Properties of power LEDs strongly depend on their internal temperature. The value of this temperature depends on the cooling conditions characterized by thermal resistance. Design/methodology/approach – The new method of measuring the value of this parameter belongs to the group of electric methods. In this method, the problem of estimating the value of electrical power converted into light is solved. By comparing the values of the case temperature obtained for the LED operating in the forward mode and the reverse-breakdown mode, the thermal power is estimated. On the basis of the measured value of the thermally sensitive parameter (the LED forward voltage) and the estimated value of the thermal power, thermal resistance is calculated. Findings – The elaborated method was used to measure thermal resistance of the selected types of power LEDs operating at different cooling conditions. The correctness of the elaborated measurement method was proved by comparing the results of measurements obtained with the use of the new method and the infrared method. Research limitations/implications – On the basis of the obtained results of measurements and the catalog data of the tested diodes, the dependence of the measurement error of thermal resistance of the LED on its luminous efficiency is discussed. Originality/value – The new measurement method is easy to use and more accurate than the classical method of thermal resistance measurement of the diode.

Стилі APA, Harvard, Vancouver, ISO та ін.

12

Yamaguchi, Nobuyoshi. "In Situ Assessment Method of Wood Using Normalized Withdrawal Resistances of Metric-Screw Type Probes." Advanced Materials Research 778 (September 2013): 217–24. http://dx.doi.org/10.4028/www.scientific.net/amr.778.217.

Повний текст джерела

Анотація:

Withdrawal resistances of wood have been applied for in situ assessment of wood in existing timber structures. The author had proposed method to estimate shear strengths of wood from measured withdrawal resistances of probes which are screwed into wood. In order to verify the accuracy of these estimated shear strengths by proposed methods, withdrawal resistance measurements and shear loading tests were conducted for wood. Single withdrawal resistance measurement was applied for wood specimens, and estimated shear strengths from withdrawal measurements were compared to the measured shear strengths by shear loading tests of wood. Correlation between the estimated shear strengths and measured shear strengths of specimens was reasonably good (R2=0.73). Multiple coaxial withdrawal resistance measurement which can provide distribution of shear strengths in cross-section of wood was also proposed. The average of estimated shear strengths by single withdrawal resistances was 7 percent less than that of measured shear strengths. The average of estimated shear strength by multiple coaxial withdrawal resistances was 3 percent greater than that of measured shear strengths. The single withdrawal measurements and multiple coaxial withdrawal resistances are available to estimate shear strengths of wood and shear strength distribution in the cross-section of wood. Estimated shear strengths obtained from these methods will be valuable for strength based in situ assessment of wood.

Стилі APA, Harvard, Vancouver, ISO та ін.

13

Yang, Ning, Hai Ting Zhu, and Shao Shan Zhong. "The Method of Conductor Resistance Autocompensation in New Two-Wire Thermistor Temperature Measurement." Advanced Materials Research 718-720 (July 2013): 450–54. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.450.

Повний текст джерела

Анотація:

Thermistor has a large temperature range, good stability and resistance to oxidation, which occupies an important position in the low-temperature measurement. This article describes new two-wire thermistor temperature measurement device using the Freescale MC9S12XS128 MCU with sampling capacitance. The device is composed of the MCU with its own A/D, MC9S12XS128 MCU, sampling capacitance, amplifier, boosted circuit, data acquisition and processing system, constant current source, etc. Using constant current source and 16-bit A/D converter designs the temperature measurement circuit, it can eliminate the effect from the conductor resistances in the traditional two-wire resistance temperature measurement system and reduce the measurement error which conductor resistances bring. The method is simple, practical, with high accuracy, strong anti-interference ability and other characteristics.

Стилі APA, Harvard, Vancouver, ISO та ін.

14

Uematsu, Masafumi, Yasser Helmy Mohamed, Naoko Onizuka, Ryotaro Ueki, Daisuke Inoue, Azusa Fujikawa, Hitoshi Sasaki, and Takashi Kitaoka. "Less Invasive Corneal Transepithelial Electrical Resistance Measurement Method." Ocular Surface 14, no. 1 (January 2016): 37–42. http://dx.doi.org/10.1016/j.jtos.2015.07.004.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

15

Chen, Xiaoming, Tianze Li, Danna Zhao, and Huichao Zhu. "High-accurate Resistance Measurement Method for Sensor Circuit." IOP Conference Series: Materials Science and Engineering 677 (December 10, 2019): 052077. http://dx.doi.org/10.1088/1757-899x/677/5/052077.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

16

Li Maotang and Li Jing. "A new type of grounding resistance measurement method." IEEE Transactions on Instrumentation and Measurement 48, no. 5 (1999): 899–902. http://dx.doi.org/10.1109/19.799643.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

17

Náhlík, Josef, Martina Heřmanová, Jan Boháček, Přemysl Fitl, and Martin Vrňata. "Differential Thickness Layer Resistance Measurement method for measurements of contact resistance of organic semiconductor thin films." Measurement 74 (October 2015): 178–85. http://dx.doi.org/10.1016/j.measurement.2015.07.025.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

18

Cheruparambil, K. R., B. Farouk, J. E. Yehoda, and N. A. Macken. "Thermal Conductivity Measurement of CVD Diamond Films Using a Modified Thermal Comparator Method." Journal of Heat Transfer 122, no. 4 (May 9, 2000): 808–16. http://dx.doi.org/10.1115/1.1318206.

Повний текст джерела

Анотація:

Results from an experimental study on the rapid measurement of thermal conductivity of chemical vapor deposited (CVD) diamond films are presented. The classical thermal comparator method has been used successfully in the past for the measurement of thermal conductivity of bulk materials having high values of thermal resistance. Using samples of known thermal conductivity, a calibration curve is prepared. With this calibration curve, the comparator can be used to determine thermal conductivity of unknown samples. We have significantly modified and extended this technique for the measurement of materials with very low thermal resistance, i.e., CVD diamond films with high thermal conductivity. In addition to the heated probe, the modified comparator employs a thermoelectric cooling element of increase conductive heat transfer through the film. The thermal conductivity measurements are sensitive to many other factors such as the thermal contact resistances, anisotropic material properties, surrounding air currents and temperature, and ambient humidity. A comprehensive numerical model was also developed to simulate the heat transfer process for the modified comparator. The simulations were used to develop a “numerical” calibration curve that agreed well with the calibration curve obtained from our measurements. The modified method has been found to successfully measure the thermal conductivity of CVD diamond films. [S0022-1481(00)00804-5]

Стилі APA, Harvard, Vancouver, ISO та ін.

19

França dos Santos, Carlos Gilmar, Livia Da Silva Oliveira, David Barbosa de Alencar, and Francisco Carlos Tavares Amorim. "Grounding Measurement Applied to a 13.8 kV Substation in Manaus - Amazonas." International Journal for Innovation Education and Research 7, no. 10 (October 31, 2019): 576–84. http://dx.doi.org/10.31686/ijier.vol7.iss10.1804.

Повний текст джерела

Анотація:

The aim of this study is to show a practical grounding measurement method for 13.8 kV step-down sheltered substation to serve as support material for use in the area.If required, an analytical comparative method for groundmeasurementthroughtheterrometer measurement equipment in the ground measurement process of a step down 13.8 kV substation with its equipment,comparing the data obtained referring to the commonly used methods, thus identifying among the most efficient grounding processes.The development of this study was based on the measurement of electrical grounding with a terrometer in a factory located in the city of Manaus. The procedure used was to perform resistance measurements, to record through measurements and images all the system measurements, to compare the values through Conventional measurement method, with electrical ground ohmic resistance meter, displaying tables and graphs to demonstrate whether the electrical grounding of the entire system would be at adequate levels.

Стилі APA, Harvard, Vancouver, ISO та ін.

20

Masiulionis, Ričardas. "INVESTIGATION OF STRAIN MEASUREMENT METHOD WITH BALANCING CURRENTS." Mokslas - Lietuvos ateitis 2, no. 1 (February 28, 2010): 68–72. http://dx.doi.org/10.3846/mla.2010.015.

Повний текст джерела

Анотація:

It is shown that construction state identification systems are integral part of public and local warning and security systems. Structure of construction of state identification system is proposed and analysed. It is established that in order to ensure wide usage of such systems it is necessary to solve some scientific problems. A new method for measurement of construction strain is presented. It is based on evaluation of small changes of resistance with balancing currents. Measurements methods of these days are listed and their main advantages are discussed. Structure of strain gauge and formulas for calculating code of resistance changes is presented. Computerized and experimental models are made.

Стилі APA, Harvard, Vancouver, ISO та ін.

21

Mezitis, Mareks, and Vladimirs Karevs. "Automatic Measurement for Internal Resistance of Battery in Uninterruptible Power Source." Scientific Journal of Riga Technical University. Power and Electrical Engineering 25, no. 25 (January 1, 2009): 141–44. http://dx.doi.org/10.2478/v10144-009-0030-2.

Повний текст джерела

Анотація:

Automatic Measurement for Internal Resistance of Battery in Uninterruptible Power SourceThis paper considers the approach to the measurement of internal resistance of the battery in the uninterruptible power sources (UPSs [1]). Advantages of the approach are the measurements in power supplies without switching-off the battery, simplicity in realization of algorithm.The basic expressions of the theory used in the method about internal resistance of the storage battery are considered.The function chart of construction of an analog part of the scheme, and also algorithm of action of the scheme of logic of decision-making are considered.Construction of the tracing generator of load, the important part in realization of the method is stated. The use of the analog machine for processing of the results of measurements and a differential method of measurement with the purpose of increase the accuracy of the method is offered.

Стилі APA, Harvard, Vancouver, ISO та ін.

22

Murakawa, Kazuo, Hideshi Oohashi, Hiroshi Yamane, Mitsuo Hattori, Shoichi Kuramoto, Masanobu Machida, and Hitoshi Kijima. "Proposal of Earthing Resistance Measurement Method without Auxiliary Electrodes." IEEJ Transactions on Fundamentals and Materials 124, no. 9 (2004): 803–11. http://dx.doi.org/10.1541/ieejfms.124.803.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

23

Takahashi, Kuniaki, Kazunobu Arii, and Akiko Kobayashi. "Interfacial Thermal Contact Resistance Measurement Method for Power Electronics." Journal of The Japan Institute of Electronics Packaging 17, no. 6 (2014): 475–78. http://dx.doi.org/10.5104/jiep.17.475.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

24

Soo Woong Park and Suck Joo Na. "A new current measurement method in resistance spot welding." IEEE Transactions on Instrumentation and Measurement 39, no. 5 (1990): 767–72. http://dx.doi.org/10.1109/19.58623.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

25

Korasli, C. "Ground Resistance Measurement With Alternative Fall-of-Potential Method." IEEE Transactions on Power Delivery 20, no. 2 (April 2005): 1657–61. http://dx.doi.org/10.1109/tpwrd.2004.833922.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

26

Lane, R., S. Freedman, and A. Guz. "A Method for the Continuous Measurement of Pulmonary Resistance." Clinical Science 82, s26 (March 1, 1992): 31P. http://dx.doi.org/10.1042/cs082031p.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

27

Gangurde, K. D., and A. D. Shaligram. "PC-Based Contact Resistance Measurement System using TLM Method." IETE Technical Review 15, no. 1-2 (January 1998): 15–19. http://dx.doi.org/10.1080/02564602.1998.11416723.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

28

Murakawa, Kazuo, Hideshi Oohashi, Hiroshi Yamane, Mitsuo Hattori, Shoichi Kuramoto, Masanobu Machida, and Hitoshi Kijima. "Proposal of earthing resistance measurement method without auxiliary electrodes." Electrical Engineering in Japan 154, no. 3 (2005): 16–26. http://dx.doi.org/10.1002/eej.20196.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

29

Grinchik, N. N., K. V. Dobrego, and M. A. Chumachenko. "On the Measurement of Electric Resistance of Liquid Electrolytes of Accumulator Battery." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 61, no. 6 (December 11, 2018): 494–507. http://dx.doi.org/10.21122/1029-7448-2018-61-6-494-507.

Повний текст джерела

Анотація:

Operational control of parameters of electrolytes (first of all–of specific electric conductivity), is an important electrochemical technology. The methods of measurement of electric conductivity of electrolytes is a subject of permanent discussions because of complexity of physical-and-chemical processes accompanying ion transport and of electrolyte polarization near surfaces of electrodes and of electrochemical processes on the electrodes surfaces. Actual highand low-frequency conductometric methods require relatively expensive equipment and are not free of methodological flaws. In this paper a new method of electric resistance of liquid electrolytes is described and substantiated. It is based on automatic performance of a series of measurements of electrolyte resistance at DC, data processing and extrapolation of an appropriate dependence to threshold voltage at measurement cell plates. The character of functions approximating resistance-applied voltage dependence and method of resistance determination are substantiated. The measurements of specific resistance of some electrolytes were performed. The advantages of the proposed method and measuring device are their simplicity, cheapness, reliability and, consequently, wider possibility to utilize it at technological lines and processes, even at such sites of production processes where such a control was impractical earlier. The method can be widely used for express-diagnostics of electrolytes in such areas as electrochemical energy storage, medicine, agriculture, chemical industry, food production.

Стилі APA, Harvard, Vancouver, ISO та ін.

30

Yoon, Sungmin, Murad Y. Abu-Farsakh, Ching Tsai, and Zhongjie Zhang. "Calibration of Resistance Factors for Axially Loaded Concrete Piles Driven into Soft Soils." Transportation Research Record: Journal of the Transportation Research Board 2045, no. 1 (January 2008): 39–50. http://dx.doi.org/10.3141/2045-05.

Повний текст джерела

Анотація:

The evaluation of axial load resistance of piles driven into soft Louisiana soils based on reliability theory is presented. Forty-two square precast, prestressed, concrete piles that were tested to failure were included in the investigation. The predictions of pile resistances were based on static analysis (α-method for clay and Nordlund method for sand) and three cone penetration test (CPT) direct methods: the Schmertmann, De Ruiter–Beringen, and Bustamante–Gianeselli methods. In addition, dynamic measurements with signal matching analysis of pile resistances using CAPWAP, which is based on the measured force and velocity signals obtained near the pile top during driving, were evaluated. The Davisson and modified Davisson interpretation methods were used to determine the measured ultimate load-carrying resistances from pile load tests. The predicted ultimate pile resistances obtained by using the different prediction methods were compared with the measured resistances determined from pile load tests. Statistical analyses were carried out to evaluate the capability of the prediction design methods to estimate the measured ultimate pile resistance of driven piles. The results showed that the static method overpredicted the pile resistance, whereas the dynamic measurement with signal matching analysis (CAPWAP end-of-driving and 14-day beginning-of-restrike) underpredicted the pile resistance. Of the three direct CPT methods, the De Ruiter–Beringen method was the most consistent prediction method with the lowest coefficient of variation. Reliability-based analyses, by using the first-order, second-moment method, also were conducted to calibrate the resistance factors (φ) for the investigated pile design methods. The resistance factors for different design methods were determined and compared with AASHTO recommendation values. The calibration showed that De Ruiter–Beringen method has a higher resistance factor (φDe Ruiter = 0.64) than the other two CPT methods.

Стилі APA, Harvard, Vancouver, ISO та ін.

31

Wang, Xuan Ze, Xu Qing Mo, Liang En Yang, Zhong Sheng Zhai, Wen Chao Liu, and Zhi Xiong. "A Kind of Resistance Capacitance Measurement Method Based on Time Constant." Advanced Materials Research 1037 (October 2014): 156–60. http://dx.doi.org/10.4028/www.scientific.net/amr.1037.156.

Повний текст джерела

Анотація:

This paper proposes a capacitance resistance measurement method based on time constant. Using the charging and discharging characteristics of the resistance and capacitance measures the value of the resistance and capacitance through a semi potential rise and fall time measurement. Theoretical analysis of the relationship between the value of the resistance and capacitance and the measuring time, designing the fast second charging and discharging method meeting the initial condition of charge and discharge, improving the measurement speed, expanding the measurement range of the resistance and capacitance. Realizing the effective measurement of the resistance and capacitance by the FPGA control logic and timing method.

Стилі APA, Harvard, Vancouver, ISO та ін.

32

Dai, Wen Jin, and Kai Wang. "A New Impulse Grounding Resistance Measuring Instrument." Applied Mechanics and Materials 29-32 (August 2010): 991–96. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.991.

Повний текст джерела

Анотація:

This paper introduces a convolution calculation method first, and thus to design a portable shock resistance measuring instrument. With the MATLAB simulation of software and field measurements of the measurement instrument, obtain the satisfactory results, thus proving the usefulness of this method.

Стилі APA, Harvard, Vancouver, ISO та ін.

33

Su, Xu, Jie Nan Dong, Xiao Na Cui, Hong Feng Wei, and Miao Wang. "Influence of Polymer on Resistance Method Measuring Saturation." Applied Mechanics and Materials 411-414 (September 2013): 2975–78. http://dx.doi.org/10.4028/www.scientific.net/amm.411-414.2975.

Повний текст джерела

Анотація:

This article adopts resistance method measuring saturation, and do research about the impact of polymer resistance - saturation curve measurement. Results showed that in the resistance method for detection of residual oil distribution, there are significant effects of the experiment of water salinity on measuring the resistance and standard curve. When the polymer water ionic concentration is small, resistances of polymers are double impacted by the salinity of formation water and the polymer concentration. Experiments show that as the polymer concentration increased, the resistance value decreases. In view of the configuration of CNOOC formation water polymer, concentration has no effect on resistance of basic, the influence of polymer for measuring resistance value and relation curve is mainly depended on formation water salinity, and consistent with the influence of formation water salinity.

Стилі APA, Harvard, Vancouver, ISO та ін.

34

Pleština, Vladimir, Vedran Boras, and Hrvoje Turić. "The Measurement Uncertainty in Determining of Electrical Resistance Value by Applying Direct-Comparison Method." Energies 15, no. 6 (March 14, 2022): 2115. http://dx.doi.org/10.3390/en15062115.

Повний текст джерела

Анотація:

This paper considers the unknown electrical resistance (measurand) as the numerical result of the measurement that was carried out by means of the well-known direct comparison measurement method using an appropriate standard resistor and voltmeter. In the literature, this measurement method is also referred to as a series comparison method. This method of measurement is one of the indirect methods and is suitable for measuring low resistance. This paper presents two approaches for evaluating the unknown electrical resistance and its associated combined standard uncertainty. The entire process of evaluating the combined standard uncertainty that is associated with the measurand and the standard uncertainties that are associated with the analyzed input quantities has been entirely performed in accordance with the applicable international recommendations and guidelines for the uncertainty of measurement. The analyzed approaches for evaluating the combined standard uncertainty are designed to be universal and valid both for the mutually non-correlated input quantities and for the mutually correlated input quantities, which can be obtained from a single observation, or repeated observations or by other means. This paper can substantially contribute to the measurements in electrical engineering and education.

Стилі APA, Harvard, Vancouver, ISO та ін.

35

Ali, Rasha S. M. "Applied signal effect in the potentiometric method on the resistance measurements accuracy." International Journal of Metrology and Quality Engineering 9 (2018): 18. http://dx.doi.org/10.1051/ijmqe/2018018.

Повний текст джерела

Анотація:

In this paper, the effect of applying dc voltage and dc current sources in using the potentiometric method on the accuracy and the uncertainty of the resistance measurements is studied. This study is done practically for the low and high values of standard resistance ranges from 100 to 10 MΩ. The traceability chain for the used resistors is introduced by using the standard resistors 1 Ω Thomas type, 10 kΩ model SR104, and four Hamon transfer standards. The system operation is remotely controlled by using a LabVIEW program to improve the performance. The measurement results and the uncertainty estimation values are discussed to identify the effect of the applied voltage and current on the different resistance ranges measurement.

Стилі APA, Harvard, Vancouver, ISO та ін.

36

Donnelly, D. F. "A novel method for rapid measurement of membrane resistance, capacitance, and access resistance." Biophysical Journal 66, no. 3 (March 1994): 873–77. http://dx.doi.org/10.1016/s0006-3495(94)80863-x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

37

Chiu, Loren Z. F., Brian K. Schilling, Andrew C. Fry, and Lawrence W. Weiss. "Measurement of Resistance Exercise Force Expression." Journal of Applied Biomechanics 20, no. 2 (May 2004): 204–12. http://dx.doi.org/10.1123/jab.20.2.204.

Повний текст джерела

Анотація:

Displacement-based measurement systems are becoming increasingly popular for assessment of force expression variables during resistance exercise. Typically a linear position transducer (LPT) is attached to the barbell to measure displacement and a double differentiation technique is used to determine acceleration. Force is calculated as the product of mass and acceleration. Despite the apparent utility of these devices, validity data are scarce. To determine whether LPT can accurately estimate vertical ground reaction forces, two men and four women with moderate to extensive resistance training experience performed concentric-only (CJS) and rebound (RJS) jump squats, two sessions of each type in random order. CJS or RJS were performed with 30%, 50%, and 70% one-repetition maximum parallel back squat 5 minutes following a warm-up and again after a 10-min rest. Displacement was measured via LPT and acceleration was calculated using the finite-difference technique. Force was estimated from the weight of the lifter-barbell system and propulsion force from the lifter-barbell system. Vertical ground reaction force was directly measured with a single-component force platform. Two-way random average-measure intraclass correlations (ICC) were used to assess the reliability of obtained measures and compare the measurements obtained via each method. High reliability (ICC > 0.70) was found for all CJS variables across the load-spectrum. RJS variables also had high ICC except for time parameters for early force production. All variables were significantly (p< 0.01) related between LPT and force platform methods with no indication of systematic bias. The LPT appears to be a valid method of assessing force under these experimental conditions.

Стилі APA, Harvard, Vancouver, ISO та ін.

38

Nowiński, Emil, Bolesław Giemza, and Marek Domański. "Thickness Measurement of Thin Oil Layers in Triboelectrical Phenomenon Aspect." Journal of KONBiN 27, no. 1 (January 29, 2015): 87–98. http://dx.doi.org/10.2478/jok-2013-0108.

Повний текст джерела

Анотація:

Abstract This paper presents problems of oil film thickness measurements, especially during tribological experiments. There are many methods of oil layer measurement. More of them is used in measurement apparatus. Most popular method to oil film thickness is electric method. Authors indicate that triboelectrical phenomenon disrupts the real value of resistance because of charge particles which change conductance of the oil layer.

Стилі APA, Harvard, Vancouver, ISO та ін.

39

Gong, Mao Fa, Hui Ting Ge, Zheng Gong, Yu Qing Lin, Bing Qian Liu, and Ning Xia Yang. "Research of DC Panel Battery Fault Detection Method." Applied Mechanics and Materials 635-637 (September 2014): 722–25. http://dx.doi.org/10.4028/www.scientific.net/amm.635-637.722.

Повний текст джерела

Анотація:

This paper elaborates the DC screen and battery DC screen fault detection method. The method of measuring battery’s internal resistance and voltage is analyzed and studied in this paper, and the two methods are optimized. Besides, the structure of the battery internal resistance, internal resistance equivalent principle and other aspects are also introduced in this paper. The optimal measurement scheme can be chosen by comparing the internal resistance measurement of DC discharge method and the AC signal injection method.

Стилі APA, Harvard, Vancouver, ISO та ін.

40

Górecki, Krzysztof, and Paweł Górecki. "The Analysis Of Accuracy Of Selected Methods Of Measuring The Thermal Resistance Of IGBTs." Metrology and Measurement Systems 22, no. 3 (September 1, 2015): 455–64. http://dx.doi.org/10.1515/mms-2015-0036.

Повний текст джерела

Анотація:

Abstract In the paper selected methods of measuring the thermal resistance of an IGBT (Insulated Gate Bipolar Transistor) are presented and the accuracy of these methods is analysed. The analysis of the measurement error is performed and operating conditions of the considered device, at which each measurement method assures the least measuring error, are pointed out. Theoretical considerations are illustrated with some results of measurements and calculations.

Стилі APA, Harvard, Vancouver, ISO та ін.

41

Li, Na, Xue Di Hao, Zheng Meng Xia, Fu Yan Lv, and Miao Wu. "Density Measurement of Coal Slime Powder by Pycnometric Method." Advanced Materials Research 753-755 (August 2013): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.3.

Повний текст джерела

Анотація:

Coal slime is solid waste with high solid content, viscosity, fine particles, which is generated in the production process of the coal industry. The density of its powder is an important factor to affect the resistance characteristics of pipeline transportation. Tests show that when the density changes 0.1g/cm3,the corresponding relative error of pipeline transportation resistance is up to 42%.Therefore, accurate density measurement of coal slime powder is the premise to calculate resistance loss, and has significance to study resistance characteristics of pipeline transportation and guide production practices. Based on pycnometric method, this paper improved the measurement, and adopted self-designed exhaust system, which is simple and easy to operate, and can effectively excludes the air in the pycnometer, thus improving measurement accuracy. Practices show that it is an effective method to measure powder density, with easy operation and high accuracy as well as good repeatability.

Стилі APA, Harvard, Vancouver, ISO та ін.

42

Ishizaki, Igami, Ueno, and Nagano. "Dynamic Thermal Contact Resistance Measurement Method Using Lock-in Thermography." Proceedings 27, no. 1 (October 10, 2019): 42. http://dx.doi.org/10.3390/proceedings2019027042.

Повний текст джерела

Анотація:

This paper proposes a new thermal contact resistance measurement method using lock-in thermography. By the lock-in thermography with an infrared microscope, the dynamic temperature behavior across the contact interface was visualized in the sample side surface. Meanwhile, a new thermal contact resistance measurement principle was constructed by the superimposition of the temperature wave from virtual heat sources in consideration of the thermal contact resistance at the interface. Consequently, the thermal contact resistance was obtained as a fitting parameter by fitting the theoretical curve to the measured amplitude and phase lag. The validity of the principle was shown.

Стилі APA, Harvard, Vancouver, ISO та ін.

43

Clarke, Robin E., Andrea Pianella, Bahman Shabani, and Gary Rosengarten. "Steady-state thermal measurement of moist granular earthen materials." Journal of Building Physics 41, no. 2 (May 23, 2016): 101–19. http://dx.doi.org/10.1177/1744259116637864.

Повний текст джерела

Анотація:

A technique based on the heat flow meter method is proposed for measuring the thermal conductivity of moist earthen and granular loose-fill materials. Although transient methods have become popular, this steady-state approach offers an uncertainty that can be reliably estimated and a test method that is widely accepted for building certification purposes. Variations to the standard method are proposed, including the use of a rigid holding frame with stiff base and silicone sponge buffer sheets, in conjunction with difference measurement to factor out the contributions from base, buffers and contact resistance. Using this approach, results are presented for green-roof substrates based on scoria, terracotta and furnace-ash at different moisture contents. Thermal conductivity ranged from 0.13 to 0.80 W/m K and fitted well to linear regression plots against moisture content. Further comparative measurements of a single specimen showed that direct measurement was less consistent than difference measurement and thus indicated that thermal resistance was higher by 0.023 m2 K/W, attributable to the presence of contact resistance.

Стилі APA, Harvard, Vancouver, ISO та ін.

44

Dong, Jie Nan, Xu Su, Lian Feng Liu, Hong Zhan Wei, and Cheng Long Ning. "Resistance Method to Determine Oil Saturation Factors Research." Advanced Materials Research 807-809 (September 2013): 2503–7. http://dx.doi.org/10.4028/www.scientific.net/amr.807-809.2503.

Повний текст джерела

Анотація:

Studying the distribution of the remaining oil is a crucial part in the process of developing oilfield. This study provides the further improvement of oil recovery rate with strong guarantee, and is a necessary method of developing further water controlling of individual reservoir oilfield. Saturation measurement techniques for remaining oil distribution research are particularly important. This paper describes the research of ways of measuring saturation in the resistance measurement experiment, the standard resistance - saturation curve and the factors influencing it. The results show that for different electrode installation, standard curve is mainly affected by the electrode distance. Standard curve is also greatly affected by water salinity, temperature and the difference in corespermeability.

Стилі APA, Harvard, Vancouver, ISO та ін.

45

Gao, Ming Yu, San Xing Chen, Li Lin Cheng, and Ming Liang Yi. "Online Measurement of Battery Internal Resistance Based on AC Impedance Method." Advanced Materials Research 718-720 (July 2013): 773–78. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.773.

Повний текст джерела

Анотація:

In this paper, the merit and disadvantage of existing measurement methods for battery internal resistance are firstly analyzed. Then an online internal resistance measurement based on AC impedance method is proposed, which can increase the stability of the excitation source and enhance the performance of the filtered feedback signal. The method can be used to measure the small resistance of lithium-ion battery precisely. Experimental results show that the proposed method is accurate.

Стилі APA, Harvard, Vancouver, ISO та ін.

46

Kamohara, Hiroaki, and Yoshiyasu Ehara. "Study on AC Insulation Resistance Measurement Method for Power Cable." IEEJ Transactions on Fundamentals and Materials 140, no. 11 (November 1, 2020): 508–15. http://dx.doi.org/10.1541/ieejfms.140.508.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

47

Nizhevskyi, I. V., V. I. Nizhevskyi, and V. E. Bondarenko. "THE EXPERIMENTAL VALIDATION OF THE GROUNDING DEVICE RESISTANCE MEASUREMENT METHOD." Electrical Engineering & Electromechanics, no. 6 (December 19, 2016): 60–64. http://dx.doi.org/10.20998/2074-272x.2016.6.10.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

48

Saijun, Zhang, Zhou Chi, Xia Qinxiang, and Chen Songmao. "Measurement of Full-field Ductile Damage based on Resistance Method." Procedia Engineering 81 (2014): 1055–60. http://dx.doi.org/10.1016/j.proeng.2014.10.140.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

49

Wang, Shaoqing, Dacheng Mao, Zhi Jin, Songang Peng, Dayong Zhang, Jingyuan Shi, and Xuanyun Wang. "A more reliable measurement method for metal/graphene contact resistance." Nanotechnology 26, no. 40 (September 17, 2015): 405706. http://dx.doi.org/10.1088/0957-4484/26/40/405706.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

50

Tashiro, Chuichi, Ko Ikeda, and Yoshihiro Inoue. "Evaluation of pozzolanic activity by the electric resistance measurement method." Cement and Concrete Research 24, no. 6 (1994): 1133–39. http://dx.doi.org/10.1016/0008-8846(94)90037-x.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Статті в журналах з теми "Resistance measurement method"

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями