scholarly journals A frequency determination method for automotive nanosensors

2021 ◽  
pp. 179
Author(s):  
Aleksandr Gurko ◽  
O.Yu. Sergiyenko
Keyword(s):  
Rational Approximation ◽  
Calculation Method ◽  
Determination Method ◽  
Automotive Applications ◽  
Electrical Parameters ◽  
Electrical Signals ◽  
Frequency Determination ◽  
New Methods ◽  
Frequency Calculation

The growing popularity of nanosensors in various automotive applications requires new methods for counting the frequency of electrical signals, into which the measured non-electrical parameters are converted. This need is because automobile nanosensors are to register very small changes in the measured parameters that, besides, can change very fast. The paper proposes for use in automotive nanosensors a frequency calculation method based on the principle of rational approximation, which meets the above requirements.

The Natural Frequency Calculation Method of Simply-Supported Beam in the Sunshine Temperature Field

2013 ◽  
Vol 394 ◽  
pp. 364-367
Author(s):  
Yong Chun Cheng ◽  
Yu Ping Shi ◽  
Guo Jin Tan
Keyword(s):  
Temperature Field ◽  
Calculation Method ◽  
Natural Frequencies ◽  
Bernoulli Model ◽  
Simply Supported Beam ◽  
Simply Supported ◽  
Frequency Calculation ◽  
Natural Frequency Calculation ◽  
Beam Bridge ◽  
T Beam

The related researches show that , the sunshine temperature field can cause the changes of the natural frequencies of the simply-supported beam. In order to recover the influence law of the temperature field on the natural frequencies, the calculation method of the natural frequencies of the simply-supported beam bridge is formed. First, according to the principles of stress equivalence, transform the sunshine temperature field to the partiality axis forces. Based on the Bernoulli model, the calculation method of the natural frequencies of the simply-supported beam under the partiality axis forces at both ends is formed. At last, take one simply-supported T beam as the object of numerical modeling and verify the validity and the reliability of this method.

A Research of Reactive Compensation Scheme Based on the Hybrid Parallel Mode of SVG and PPF

2014 ◽  
Vol 556-562 ◽  
pp. 3627-3632
Author(s):  
Cai Lin Li ◽  
Xin Wang Sun
Keyword(s):  
Calculation Method ◽  
Reactive Power ◽  
Design Method ◽  
Reactive Power Compensation ◽  
Determination Method ◽  
Compensation Scheme ◽  
Compensation Structure ◽  
Reactive Compensation ◽  
Static Var Generator ◽  
Parallel Mode

A kind of hybrid parallel compensation scheme combining active compensation and passive compensation technology was proposed in this paper. The regulating function of reactive power can be realized dynamically and smoothly by means of integrating Static Var Generator (SVG) with passive filter (PPF) and then paralleling with the system load side bus. The harmonic current and voltage in the system could be filtered out. The calculation method of total compensation capacity, the determination method of SVG compensation capacity and the design method of PPF filter branches has been presented. Simulation result has proved that this scheme can achieve reactive power compensation and complete harmonic governance at the same time. Besides, the problems of reactive power and harmonic in the power system can be solved effectively, and the good engineering practical value is obvious. Figure 1 Hybrid parallel compensation structure diagram of SVG and PPF

scholarly journals Unveiling Informational Properties of the Chen-Ouillon-Sornette Seismo-Electrical Model

Entropy ◽  
2021 ◽  
Vol 23 (3) ◽  
pp. 337
Author(s):  
Hong-Jia Chen ◽  
Luciano Telesca ◽  
Michele Lovallo ◽  
Chien-Chih Chen
Keyword(s):  
Time Series ◽  
Temporal Dynamics ◽  
Electrical Coupling ◽  
Charge Carriers ◽  
Electrical Model ◽  
Electrical Parameters ◽  
Electrical Signals ◽  
Information Measures ◽  
Block System ◽  
Electrical Condition

The seismo-electrical coupling is critical to understand the mechanism of geoelectrical precursors to earthquakes. A novel seismo-electrical model, called Chen–Ouillon–Sornette (COS) model, has been developed by combining the Burridge–Knopoff spring-block system with the mechanisms of stress-activated charge carriers (i.e., electrons and holes) and pressure-stimulated currents. Such a model, thus, can simulate fracture-induced electrical signals at a laboratory scale or earthquake-related geoelectrical signals at a geological scale. In this study, by using information measures of time series analysis, we attempt to understand the influence of diverse electrical conditions on the characteristics of the simulated electrical signals with the COS model. We employ the Fisher–Shannon method to investigate the temporal dynamics of the COS model. The result showed that the electrical parameters of the COS model, particularly for the capacitance and inductance, affect the levels of the order/disorder in the electrical time series. Compared to the field observations, we infer that the underground electrical condition has become larger capacitance or smaller inductance in seismogenic processes. Accordingly, this study may provide a better understanding of the mechanical–electrical coupling of the earth’s crust.

Design of 20m3 Liquefied Petroleum Gas Tank

2012 ◽  
Vol 503-504 ◽  
pp. 1169-1172
Author(s):  
Jian Hua Liu
Keyword(s):  
Pressure Vessel ◽  
Calculation Method ◽  
Material Selection ◽  
Design Method ◽  
Determination Method ◽  
Liquefied Petroleum Gas ◽  
Design Pressure

According to GB150-1998, the standard of steel pressure vessel, determination method on design pressure and design temperature, material selection, tanks and the head design method and opening reinforcement calculation method was introduced. Running effects were in excellent condition after a few years of use. The design method of liquefied petroleum gas tanks was introduced in this paper had a guiding role on liquefied petroleum gas tank.

scholarly journals A Frequency Determination Method for Digitized NMR Signals

2014 ◽  
Vol 15 (5) ◽  
pp. 1343-1351 ◽  
Author(s):  
H. Yan ◽  
K. Li ◽  
R. Khatiwada ◽  
E. Smith ◽  
W. M. Snow ◽  
...  
Keyword(s):  
High Precision ◽  
Transverse Relaxation Time ◽  
Observation Time ◽  
Signal Frequency ◽  
Determination Method ◽  
Transverse Relaxation ◽  
Frequency Determination ◽  
Frequency Counter ◽  
Precision Frequency ◽  
Lock In

AbstractWe present a high precision frequency determination method for digitized NMR FID signals. The method employs high precision numerical integration rather than simple summation as in many other techniques. With no independent knowledge of the other parameters of a NMR FID signal (phase ф, amplitude A, and transverse relaxation time T2) this method can determine the signal frequency f0 with a precision of if the observation time T ≫ T2. The method is especially convenient when the detailed shape of the observed FT NMR spectrum is not well defined. When T2 is +∞ and the signal becomes pure sinusoidal, the precision of the method is which is one order more precise than the ±1 count error induced precision of a typical frequency counter. Analysis of this method shows that the integration reduces the noise by bandwidth narrowing as in a lock-in amplifier, and no extra signal filters are needed. For a pure sinusoidal signal we find from numerical simulations that the noise-induced error in this method reaches the Cramer-Rao Lower Band (CRLB) on frequency determination. For the damped sinusoidal case of most interest, the noise-induced error is found to be within a factor of 2 of CRLB when the measurement time T is 2 or 3 times larger than T2. We discuss possible improvements for the precision of this method.

A Determination Procedure of Foundation and Pile Bearing Capacity in Slopes

2014 ◽  
Vol 513-517 ◽  
pp. 2655-2658
Author(s):  
Xiao Jie Chu ◽  
Shan Xiong Chen ◽  
Jian Li ◽  
Zhang Jun Dai
Keyword(s):  
Bearing Capacity ◽  
Calculation Method ◽  
Interpolation Method ◽  
Determination Method ◽  
Calculation Methods ◽  
Slope Ratio ◽  
Pile Capacity ◽  
Numerical Examples ◽  
Determination Procedure ◽  
Slope Condition

When there is a ramp, the methods of calculating the foundation and pile bearing capacity are different from the plains situation. Many scholars have been studied determination method of the foundation and pile bearing capacity under the condition of slopes. A program is developed based on the results of previous studies, which can calculate the foundation and pile bearing capacity under the condition of slopes. The program using MATLAB software integrates a calculation method of foundation and pile capacity under slope condition. Combined with numerical examples, the results illustrate the upshots of the calculation methods in the program on the basis of the literature by interpolation method with the adjustment coefficients are accurate. And analyzed the influence of slope ratio on the bearing capacity: capacity and slope ratio was negatively correlated, with the slope ratio decreases, the capacity is on the increase, but the degree of increase based on the slope ratio.

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