Measurement of Phase Angle Errors of Precision Current Shunts in the Frequency Range From 40 Hz to 200 kHz

2007 ◽  
Vol 56 (2) ◽  
pp. 284-288 ◽  
Author(s):  
I. Budovsky
Keyword(s):  
Phase Angle ◽  
Frequency Range ◽  
40 Hz

Methods to ascertain the resistance of stranded conductors in the frequency range of 40 Hz–150 kHz

2019 ◽  
Vol 174 ◽  
pp. 105862 ◽  
Author(s):  
András Mohos ◽  
József Ladányi ◽  
Dániel Divényi
Keyword(s):  
Frequency Range ◽  
40 Hz

scholarly journals ASSESSMENT OF UNCERTAINTY IN THE CALIBRATION PHASE ANGLE GENERATORS ON THE STATE PRIMARY STANDARD PHASE ANGLE BETWEEN TWO VOLTAGES AT THE FUNDAMENTAL FREQUENCY RANGE

2017 ◽  
Vol 0 (17) ◽  
pp. 32-39
Author(s):  
Величко Олег Миколайович ◽  
Шевкун Сергій Миколайович ◽  
Юлія Миколаївна Куліш ◽  
Марина Валеріївна Добролюбова
Keyword(s):  
Fundamental Frequency ◽  
Phase Angle ◽  
Primary Standard ◽  
The State ◽  
State Primary Standard ◽  
Frequency Range

scholarly journals Transglutaminase Shows Better Functionality on High Digestible, High Lysine Sorghum-Wheat Composite Dough and Bread, Compared to Normal Sorghum-Wheat Composites

2019 ◽  
Vol 7 (6) ◽  
pp. 877 ◽  
Author(s):  
Yunus Emre Tunçil ◽  
Mehtap Fevzioglu ◽  
Seda Arioglu-Tunçil ◽  
Gebisa Ejeta ◽  
Osvaldo H. Campanella ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Phase Angle ◽  
Strain Amplitude ◽  
Viscoelastic Properties ◽  
Elastic System ◽  
Frequency Range ◽  
High Lysine ◽  
Substitution Level ◽  
Linear Viscoelastic ◽  
Dough Rheological Properties

Highly digestible high-lysine (HDHL) sorghum-wheat composites have previously been shown to produce better composite dough and bread compared to normal sorghum-wheat composites. This study aimed to test whether improved HDHL lines can provide further enhanced functionality through the effects of transglutaminase (TG) enzyme to improve dough rheological properties. Sorghum-wheat composite doughs were made using HDHL and normal sorghum flours at substitution levels of 10, 20, and 30%, with and without 0.15% TG. Rheological properties of dough were tested using a mechanical spectrometer at 0.05% strain amplitude (within the linear viscoelastic region) over a 0.01- 50 rad/sec frequency range. A more elastic system was observed in HDHL sorghum-wheat composites above 10% substitution levels compared to normal sorghum-wheat composite dough. Addition of TG to HDHL sorghum-wheat composites resulted in a decrease in phase angle values at all substitution level, indicating that TG increased the dough elasticity. However, TG did not change viscoelastic properties of normal sorghum-wheat composites. Bread from HDHL sorghum-wheat composites had significantly higher (P

Acoustic velocities and electrical properties of frozen sandstones and shales

1977 ◽  
Vol 14 (5) ◽  
pp. 1004-1013 ◽  
Author(s):  
M. S. King
Keyword(s):  
Electrical Resistivity ◽  
Electrical Properties ◽  
Phase Angle ◽  
The Arctic ◽  
Frequency Range ◽  
Ultrasonic Velocities ◽  
Sharp Reduction ◽  
Wave Velocities ◽  
Shear Wave Velocities ◽  
Acoustic Velocities

Ultrasonic velocities and electrical properties have been measured in the laboratory at permafrost temperatures on a number of samples of sandstones and a shale which had been recovered from boreholes in the arctic and stored in their natural frozen state. Compressional and shear-wave velocities, electrical resistivity, and phase-angle relationships in the frequency range 0.005–100 kHz have been measured on the permafrost samples, at temperatures in the range −18 °C–+4 °C.Results of the tests show that, at a particular temperature, there is a small decrease in the electrical resistivity measured on all samples tested as the frequency is increased. The phase-angle differences measured show no consistent relationship with either frequency or temperature, but they are all less than 12° in magnitude. The electrical resistivity at a particular frequency and the ultrasonic velocities are affected in a similar manner by changes in temperature. Whereas the sandstones show a sharp reduction in velocities and resistivity as the temperature is raised to 0 °C or above, the shale shows little dependence of these parameters on changes in temperature in the range tested. An increase in shale content of the sandstone results in behavior intermediate between that of a clean sandstone and that of a shale.

scholarly journals The effect of 2020 COVID-19 lockdown measures on seismic noise recorded in Romania

Solid Earth ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 2351-2368
Author(s):  
Bogdan Grecu ◽  
Felix Borleanu ◽  
Alexandru Tiganescu ◽  
Natalia Poiata ◽  
Raluca Dinescu ◽  
...  
Keyword(s):  
Noise Reduction ◽  
High Frequency ◽  
Urban Areas ◽  
Seismic Noise ◽  
Human Mobility ◽  
Vertical Component ◽  
World Health ◽  
High Frequency Range ◽  
Frequency Range ◽  
40 Hz

Abstract. After the World Health Organization declared COVID-19 a pandemic in March 2020, Romania followed the example of many other countries and imposed a series of restrictive measures, including restricting people's mobility and closing social, cultural, and industrial activities to prevent the spread of the disease. In this study, we analyze continuous vertical component recordings from the stations of the Romanian Seismic Network – one of the largest networks in Europe, consisting of 148 stations – to explore the seismic noise variation associated with the reduced human mobility and activity due to the Romanian measures against COVID-19 in detail. We focused our investigation on four frequency bands – 2–8, 4–14, 15–25 and 25–40 Hz – and found that the largest reductions in seismic noise associated with the lockdown correspond to the high-frequency range of 15–40 Hz. We found that all the stations with large reductions in seismic noise (>∼  40 %) are located inside and near schools or in buildings, indicating that at these frequencies the drop is related to the drastic reduction of human activity in these edifices. In the lower-frequency range (2–8 and 4–14 Hz) the variability of the noise reduction among the stations is lower than in the high-frequency range, corresponding to about 35 % on average. This drop is due to reduced traffic during the lockdown, as most of the stations showing such changes in seismic noise in these bands are located within cities and near main or side streets. In addition to the noise reduction observed at stations located in populated areas, we also found seismic noise lockdown-related changes at several stations located far from urban areas, with movement of people in the vicinity of the station explaining the noise reductions.

scholarly journals The effect of 2020 COVID-19 lockdown measures on seismic noise recorded in Romania

2021 ◽  
Author(s):  
Bogdan Grecu ◽  
Felix Borleanu ◽  
Alexandru Tiganescu ◽  
Natalia Poiata ◽  
Raluca Dinescu ◽  
...  
Keyword(s):  
Noise Reduction ◽  
High Frequency ◽  
Seismic Noise ◽  
Human Mobility ◽  
Vertical Component ◽  
World Health ◽  
High Frequency Range ◽  
Frequency Range ◽  
Noise Characteristics ◽  
40 Hz

Abstract. After the World Health Organization declared COVID-19 a pandemic in March 2019, Romania followed the example of many other countries and imposed a series of restrictive measures, including restricting people's mobility and closing social, cultural and industrial activities to prevent the spread of the disease. In this study, we analyze continuous vertical component recordings from the stations of the Romanian Seismic Network – one of the largest networks in Europe containing 148 stations – to explore in detail the seismic noise variation associated with the reduced human mobility and activity in Romania due to COVID-19. We focused our investigation on four frequency bands – 2–8 Hz, 4–14 Hz, 15–25 Hz and 25–40 Hz – and found that the largest reductions in seismic noise associated with the lockdown corresponds to the high frequency range, from 15 to 40 Hz. We found that all the stations with large reductions in seismic noise (> ~40 %) are located inside and near schools or in buildings, indicating that at these frequencies the drop is related to the drastic reduction of human activity in these edificies. In the lower frequency range (2–8 Hz and 4–14 Hz) the variability of the noise reduction among the stations is lower than in the high frequency range, and the noise level is reduced by up to 35 %. This drop is due to reduced traffic during the lockdown, as most of the stations showing such changes in seismic noise in these bands are located within cities, near main or side streets. In addition to the noise reduction observed at stations located in populated areas, we also found seismic noise lockdown-related changes at several stations located far from urban areas, with movement of people in the vicinity of the station explaining the noise reductions. Apart from the opportunity to investigate in more detail the seismic noise characteristics due to human mobility and activity, we show that noise reduction during the lockdown has also improved the earthquake detection capability of the accelerometers located in noisy urban environments.

scholarly journals Dielectric relaxation of nonaqueous ionic liquid microemulsions: polarization, microstructure, and phase transition

RSC Advances ◽  
2017 ◽  
Vol 7 (23) ◽  
pp. 13733-13741 ◽  
Author(s):  
Cancan Zhang ◽  
Zhen Zhen ◽  
Liyan Ma ◽  
Kongshuang Zhao
Keyword(s):  
Phase Transition ◽  
Ionic Liquid ◽  
Dielectric Relaxation ◽  
Dielectric Spectroscopy ◽  
Wide Frequency Range ◽  
Frequency Range ◽  
40 Hz

Two nonaqueous ionic liquid (IL) microemulsions (toluene/TX-100/[bmim][PF6] and [bmim][BF4]/TX-100/benzene) were studied by dielectric spectroscopy covering a wide frequency range (40 Hz to 110 MHz).

Dynamic Properties of Silicate-Grouted Sand at Low Stress Level

2014 ◽  
Vol 905 ◽  
pp. 259-262
Author(s):  
J.R. Kim ◽  
D. Bakhtiyarov ◽  
G. Zhumabekov ◽  
D. Saliyev
Keyword(s):  
Phase Angle ◽  
Sandy Soil ◽  
Stress Level ◽  
Complex Modulus ◽  
Dynamic Properties ◽  
Frequency Range ◽  
Creep Tests ◽  
Hysteretic Loop ◽  
Complex Compliance ◽  
Strain Relationship

The creep behaviors of silicate-grouted sandy soil were investigated. A series of haversine creep tests with three frequencies (0.01 Hz, 0.05 Hz, and 0.1 Hz) were carried out to evaluate the dynamic properties (complex modulus and phase angle) of materials at low stress level. The stress-strain relationship for the sinusoidal test was plotted as an elliptical hysteretic loop. The complex modulus |G*(ω)| and the phase angle δ were determined from the hysteretic loop at a given frequency ω. While the complex modulus |G*(ω)| of the tested material increased, the complex compliance |J*(ω)| and the phase angle δ decreased with frequency ω within the tested frequency range.

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