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M. Yu. Shatalov A. S. Demidov I. A. Fedotov 《Theoretical Foundations of Chemical Engineering》2016,50(2):148-157
The inverse problem of identifying the parameters of sets of ordinary differential equations using experimental measurements of three functions that correspond to some components in the vector solution of a set is considered. A private case that is important for applications of chemical and biochemical kinetics when reduced equations linearly depend on the combinations of initial unknown parameters has been studied. An analysis and the numerical results are presented for two types of sets of chemical kinetics equations, such as the Lotka–Volterra model that describes the coexistence of a predator and a prey and the chemical kinetics equations that model enzyme catalysts reactions, including the Michaelis–Menten equations. The search for unknown parameters is confined to the problem of minimizing a quadratic function. In this case, the reduced differential equations of systems are used instead of their vector solutions, which are unknown in most cases. The cases of both stable and unstable search for unknown parameters are analyzed. 相似文献
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S. B. Aleksandrov A. N. Alekseev D. M. Demidov A. L. Dudin N. I. Katsavets I. V. Kogan Yu. V. Pogorel’skii A. L. Ter-Martirosyan É. G. Sokolov V. P. Chaly A. P. Shkurko 《Technical Physics Letters》2002,28(8):696-698
The parameters of high-power laser diodes operating at λ=0.94 μm, based on MBE-grown In0.1Ga0.9As/AlGaAs/GaAs quantum-dimensional heterostructures, are reported. The laser diodes manufactured using an optimized MBE technology and specially selected dopant profiles are characterized by a lowthreshold current density, a high optical output power, a high differential quantum efficiency, and a long working life (above 10000 h). 相似文献
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S. S. Demidov E. A. Klimanov 《Journal of Communications Technology and Electronics》2016,61(3):328-332
Relationships, which determine requirements for the resistance of the inversion layer for decreasing the influence of the guard ring on the dark current and photodiode noisess and allow obtaining the specified intercoupling coefficient between photosensitive elements in multielement photodiodes, are given. It is shown that dependences of the current of the guard ring on the bias voltage and the charge on the Si–SiO2 interface in the presence of the inversion layer satisfy the current generation model in the space-charge region of the current. The resistance of the inversion layer increase with an increase in the bias voltage in accordance with the relationship Ru ~ V1.5. 相似文献
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The influence of the front angles of modular hobs in various shaping methods and the approximation of the tooth profile on the tooth-profile precision for straight-tooth cylindrical gears is considered. The loss of precision with increase in the front angles of hobs with linear cutting edges is explained, as well as the difference in precision of opposite sides of the teeth. 相似文献