About applicability of quasi-statistic method of autodyne systems analysis

There is shown applicability of quasi-static method for analysis of differential equations of single-circuit autodyne generator. We propose the methodology of quasi-static calculation of autodyne response taking into account of members of higher approximation order. The estimation of calculation inaccuracy in case of quasi-static method application is given, conditions of stability of the system of autodyne generator-reflecting object are considered, and comparative calculation of autodyne response for a cases of application of zeroth and tenth approximations.     

About principal possibility of automated following by active frequency of non-stationery processes spectrum by means of active filter

It is underlined explicit usefulness and efficiency of hardware analysis of active spectrum of non-stationery processes, necessity of automated following by frequency of input signal filters (AFFF) application as analyzing filters. It is mentioned drawbacks of analysis methods of such filters and necessity of approval possibility of frequency self-tuning of any type filters (FSAF) of high order. Possibility of FSAF and, hence, AFFF is proven in terms of application of some known features of manual regulation of electrical filters. By means of computer mathematical modeling in system VisSim/com it is proven AFFF possibility. It is underlined possibilities of some useful their application.     

Forced nonlinear precession of the magnetization vector under the conditions of an orientation transition

Forced nonlinear precession of the magnetization vector in a normally magnetized magnetic plate under the conditions of an orientation transition is considered. It is shown that, in the field lower than the form demagnetization field, the variable circularly polarized field causes precession of the equilibrium position of the magnetization vector. It is demonstrated based on a vector model in which the precession period of the equilibrium position is inversely proportional to the squared amplitude of the variable field and the sine of the angle of deviation of the equilibrium position of magnetization from the constant field. It is shown that the critical parameters necessary for excitation of precession of the equilibrium position are the amplitude and frequency of the variable field. Diagrams determining domains of existence of precession of the equilibrium position for different saturation magnetization of a magnetic plate are constructed in terms of the coordinates variable field amplitude-frequency. The role of dissipation of magnetization oscillations in the determination of the critical parameters is elucidated. The features of precession in the presence of asymmetric excitation and in the presence of anisotropy in the plane of the plate are noted.     

一种新的变步长LMS算法在通信对消技术的应用

本文通过分析几种变步长LMS算法,结合VSS-NLMS算发和NLMS算法的优点,采用符号函数降低原有算法的计算复杂度,对变步长参数进行调整,提出了一种改进的变步长LMS算法,通过仿真验证,新提出的算法在收敛速度和稳态误差上也有一定优点,具有工程实际意义。     

基于双Wollaston棱镜的偏振测量系统的精度分析

为了研究航天偏振辐射计的偏振测量精度,从偏振参量的反演过程出发,结合偏振辐射定标的方法,得出Wollaston棱镜安装角度误差和因加工工艺等造成的光束非正交的角度误差对偏振测量有一定的影响。结果表明,在角度误差一定的前提下,偏振度测量误差随入射光偏振态的变化而变化;当Wollaston棱镜角度误差都控制在0.1°内,偏振度测量精度满足航天偏振辐射计的指标要求。     

红外无线信道特性的评价方法

基于评价室内红外无线通信信道的目的,采用改进的朗伯定律描述室内表面的漫射特性,分析了信道中直射及漫射分量的大小,定义了评价红外无线信道的瞬态响应及时延的表达方法,并针对几个实用信道进行了模拟。结果表明,光接收机的ＦＯＶ及位置的变化对信道特性的影响较大。通过信道特性的分析比较,对构成高健壮性的室内光无线通信信道有积极意义。     

男性不孕症患者精子超微结构异常的电镜诊断

对63例男性不孕症患者的精子做了电镜超微结构观察,并做了与之对应的光镜及常规检查。除11例为死精症外,52例均为精子结构异常。52例中40例为头部异常,12例尾异常。头部异常主要为无顶体、顶体发育不良和染色质发育不良,尾异常主要为2＋9＋9结构异常及接柱异常。结果显示精子电镜超微结构检查能很好地避免误诊,并对精子结构异常的种类做出准确的诊断。     

TD-LTE系统帧配置方法的研究

针对TD-LTE无线网络规划中时隙规划的需要,对TD-LTE小区帧配置方法进行了研究.首先归纳总结了TD-LTE系统吞吐量计算方法,通过仿真,验证了TD-LTE帧配置对系统容量的影响.然后研究了TD-LTE单业务小区的帧配置方法,设计建立了基于帧结构的TD-LTE小区业务吞吐量仿真平台,并对单业务小区的用户平均吞吐量进行了仿真分析,给出了部分单业务小区的最佳帧配置建议.最后,仿真分析了多业务小区的用户平均吞吐量,给出了部分混合业务下小区的最佳帧配置建议.     

Topological temperature compensation in hybrid-film microthermostat on a basis of accounting of heat emission of thermostatically controlled elements of radio engineering devices

It is considered carrying out the topology temperature compensation of thermostatically controlled elements on a basis of application of effect of minimal statistic inaccuracy of temperature control with purpose of minimization of temperature inaccuracy of radio engineering devices. Numerical simulation of two-dimension non-stationery temperature fields of thermostable substrate of hybrid-integral circuits is carried out, taking into account heat emission of thermostatically controlled elements and existing heat exchange mechanisms of proportional temperature controller.     

Effect of sodium selenite on the activity of antioxidant enzymes (superoxide dismutase, glutathione peroxidase) during hepatocarcinogenesis

Influence of sodium selenite on functioning of the systems of intracellular generation and detoxication of active oxygen compounds in hepatocarcinogenesis induced by diethylnitrosamine has been studied in experiments on rats. It has been shown that the duration of latent period initiated by ions of Fe2+ chemiluminescence of homogenate of the liver rather objectively reflects the state of the functioning of the systems in charge of the formation and utilization of free radicals of oxygen in a cell. It is supposed that one of the mechanisms of anticarcinogenic action of selenium is connected with its antioxidant functions in the organism and consists in the increase of the activity of superoxide dismutation and selenium-dependent glutathione peroxidases, providing a reliable level of enzymatic protection of normal cells from disturbing action of "active oxygen".     

Statistical characteristics of chaoticity and incomplete chaoticity of irregular oscillations generated by a strongly nonlinear autonomous system with two degrees of freedom

The notion of the interval of nonergodicity as one of the statistical characteristics for time realizations of an irregular process is introduced. A method for determination of this factor based from the analysis of autocorrelation functions of truncated realizations is developed. The chaoticity of irregular oscillations in a strongly nonlinear autonomous system with two degrees of freedom is proved using the criterion of decomposition of time correlations. The statistical indication of the existence of incomplete chaoticity of oscillations in the case of incomplete decomposition of correlations is formulated. Conditions of weak distortions of the energy spectrum for truncated realizations are determined. Probability distribution functions for the characteristics of an irregular time process in the studied system are considered.     

多自由度无人船系统建模

本文通过对多自由度下无人船的运行情况分析,提出了多自由度的无人船建模方法,主要是通过分析建立无人船的六自由度的MMG分离型模型,并依次减少一个自由度,推导出了其五自由度、四自由度与三自由度下的数学运动模型,解决了无人船在各个自由度下的建模问题。在建模时依次讨论了各个自由度下无人船舵、螺旋桨、粘性流体动力的力与力矩模型,以及其受到的风、浪、流的干扰模型,得出了比较完整统一的各个自由度船体数学运动模型。     

The role of transport processes of nonequilibrium charge carriers in radiative properties of arrays of InAs/GaAs quantum dots

The results of time-resolved photoluminescence studies of heterostructures containing monolayer arrays of InAs/GaAs quantum dots are presented. A two-component time dependence of intensity of photoluminescence from the ground state of quantum dots, with characteristic times of the slow component up to hundreds of nanoseconds and those of rapid one several nanoseconds, is studied. It is shown that the slow component is determined by the transport of nonequilibrium charge carriers between the quantum dots. At low temperatures, the time of the slow component is determined by tunneling, and at high temperatures by thermal escape of nonequilibrium charge carriers. The ratio of the contributions of tunneling and thermal escape is determined by the degree of isolation of quantum dots. A theoretical model is constructed that describes the effect of the dynamics of carrier transport on the emergence and decay of the slow component of photoluminescence.     

Modeling of wideband slow-wave structures of coupled-cavities-chain type by the impedance design of experiments

The results of investigation on the possibility of a substantial extension of the operating-frequency band of a slow-wave structure of coupled-cavities-chain type are presented for the case of a small variation in the slowing factor of the phase velocity of a wave, including, in the case of convergence of the cavity and slot passbands. The investigation is performed with the use of regression models for electrodynamic characteristics of the slowing structure that are constructed on the basis of the results obtained by the impedance design of experiments. Variants of wideband chains of coupled cavities with differences in the phase-velocity slowing factor of ±3% and the operating width of the cavity passband of up to 35%, as well as structures with merging of the cavity and slot passbands and a resulting passband of up to 70% and a coupling impedance of 18–0.4 Ω, are obtained.     

Numerical simulation of hydrogenation of GaAs at the cooling stage

Evolution of concentration profiles of all types of hydrogen particles, charge carriers, active doping impurity, and distribution of the electric field in the near-surface layer of hydrogenated p-GaAs during cooling the sample after finishing the stage of introduction of hydrogen is simulated. It is shown that the form of final concentration profiles of hydrogen-containing particles and distribution of the intrinsic electric field in the hydrogenated p-GaAs layer depend on the temperature-time mode of cooling the sample. The degree of the effect of the cooling rate on the final state of hydrogenated layer increases as the doping level of semiconductor is decreased. Systematic features of formation of the final state of the hydrogen-crystal system depending on the cooling rate of the sample are presented and discussed.     

Methods of accelerated characterization of VLSI cell libraries with prescribed accuracy control

The problems of simulation and characterization of VLSI standard cell libraries designed on the basis of semiconducting CMOS-technologies of the deep submicron and nanometer level are considered. The acceleration methods of the characterization process resulted in the identification of parameters of logic cell macromodels under the multiple simulation of cells on a circuit level for different versions of input actions and under the values of process-dependent parameters and modes of circuit operation. The algorithms of constructing the circuit characterization are directed at decreasing computational expenditures and ensuring the required accuracy of the macromodels. The results of the comparative analysis of different versions of the proposed algorithms are given.     

基于物联网的图书馆管理系统

针对物联网的基本概念、起源、发展以及物联网关键技术,针对图书馆借书流程、图书快速定位、图书安全等问题与RFID技术的应用进行设计。通过介绍智能图书馆对于物联网技术的应用,提出智能图书馆的智能化和便捷化,同时也提出了发展物联网的重要意义,通过对只能图书馆的设计,让人们真切感受到物联网对人们生活的提升。     

Numerical simulation of two-particle resonant scattering with the formation of a molecular ion

Using numerical simulation, the process of formation of a positively charged molecular ion during resonant scattering of a positive ion by the intrinsic atom is considered. The method of calculation of physical characteristics of the process based on the notion of evolution of classic Ψ function of the system as classic evolution of all pairs of initial particles is suggested. Integrated characteristics of model processes of formation of the molecular ion are calculated. The probabilistic estimates of formation of the positive molecular ion of hydrogen are obtained.     

印制电路板设计的电磁兼容性分析

阐述了电磁环境日益复杂的情况下,印制电路板电磁兼容性设计在电子产品设计中的必要性,并在分析印制电路板造成信号传输损失、电磁能量辐射形成机理的基础上对印制电路板设计中影响印制线条阻抗的因素、阻抗匹配的重要性和如何控制信号传输线的阻抗,以及印制电路板的地线结构作了分析,从避免印制电路板形成辐射和提高其抗干扰能力的角度阐述了在印制电路板上如何合理布置地线及地线网格、地线面的应用方法,最后分析了印制电路板的布线原则。     

Minimization of Moore finite automata by internal state gluing

A method for minimization of Moore finite automata based on the operation of gluing two states and on the represention of a finite automaton in the form of a transition list is considered. Conditions of the identical operation and deterministic behavior of the finite automaton obtained as a result of gluing two states are presented. Cases of formation of wait states as a result of state gluing are considered. Algorithms for minimization of the number of internal states, transition routes, and input variables of Moore finite automata are described. Features of application of the proposed approach are reported.