Field pattern produced by a high-frequency inductive transducer in a bioobject model

Measurement Techniques -     

Physical model of an integrating converter

Results are presented of theoretical investigations of a thermal converter model in a nonstationary operating mode.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 55, No. 6, pp. 965–970, December, 1988.     

A model of a magnetomodulation converter

A model of a magnetomodulation converter in which the remagnetization of the sensitive elements is approximated by a piecewise-linear function is proposed. Translated from Izmeritel’naya Tekhnika, No. 1, pp. 47–51, January, 2009.     

Nonstationary distribution of concentrations in a chemotron converter

The problem of nonstationary distribution of the concentration of an oxidized component of the electrolyte in the cathode region of a chemotron converter is solved.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 17, No. 6, pp. 1123–1126, December, 1969.     

Analysis of an analog-digital converter with a dynamic integrator

Translated from Izmeritel'naya Tekhnika, No. 6, pp. 38–40, June, 1990.     

Dynamic model of bitwise-balancing analog-to-digital converter

A dynamic model of a bitwise-balancing analog-to-digital converter that allows for the main factors influencing accuracy is described. The probability characteristics of the dynamic error are obtained and recommendations for its reduction are provided. Translated from Izmeritel'naya Tekhnika, No. 7, pp. 53–56, July, 2000.     

Frequency domain model of an hvdc link with a line-commutated current-source converter. part I: fixed overlap

This study presents a frequency-domain model of an high voltage direct current (HVDC) transmission link with a line-commutated current-source converter. Using space-vector transfer functions between superimposed oscillations in the control signal and the AC and DC sides, expressions for voltages and currents have been derived. The dynamic properties of the HVDC link, taking the characteristics of the networks on both the AC and the DC sides into consideration, can be studied by applying classical Bode/Nyquist/Nichols control methods. The resulting model was validated by time-domain studies in PSCAD/EMTDC. The model is described in two papers. In this paper (Part I), it has been assumed that the overlap angle during commutation remains constant. It is shown in the validation that this assumption introduces resonances that cause severe errors at certain network conditions. In the second paper (Part II), the model is extended so as to cope with the varying overlap angle in order to bring the frequency-domain model into agreement with the results obtained from time-domain simulations.     

The stress distribution around a crack perpendicular to an interface between materials

The plane strain problem of a crack terminating perpendicular to a planar interface between two isotropic half spaces with different elastic constants is solved to obtain the distribution of stress in the vicinity of the crack tip. The relative elastic constants are shown to strongly affect the relative magnitudes of the various stress components as well as their radial drop off with distance from the crack tip. The implications of the results with regard to failure modes in composite materials are discussed.     

薄膜电子式电/气转换机构气场数学模型及其验证

为一种薄膜电子式电/气转换机构划分了工作状态,分别建立了气场模型,并以实验手段进行了验证.在转换机构的工作区间内,理论模型和实际工作状态吻合良好,从而为机构参数优化和进一步提高工作稳定性提供了理论依据.     

A frequency distribution function derived from a stochastic model considering human behaviors and its comparison with an empirical bibliometric distribution

Simon's stochastic model is extended to take both selective and random factors in human behaviors into consideration. The resulting distribution function is of non-steadystate type and approaches the Poisson distribution at the random limit while the Yule (or Zipf) distribution at the selective limit. A comparison of the theoretical distribution with an observed one for classification items indexed in a bibliorgraphic database is made. The results give some insights into statistical features of a class in which the total number of elements is fixed.     

Calculation of the errors of an inductive voltage divider with a balancing winding

A procedure for calculating the errors of the transfer factor due to the fact that the parameters of the sections of an inductive voltage divider with a balancing winding are not identical is proposed. The results of experimental investigations are presented.Translated from Izmeritelnaya Tekhnika, No. 10, pp. 40–43, October, 2004.