基于LabWindows/CVI的多线程测控软件设计技术

多线程技术是W in32操作系统的一项重要软件技术。CVI 6.0及其以后版本提供了线程池和异步定时器两种多线程运行机制,为测控软件的设计开发带来了一次技术飞跃。文中结合测控软件设计实例,详细介绍了在CVI平台下多线程编程技术的应用方法。     

Neuronet analysis of the effect of alloying elements on the radiation embrittlement of VVÉR-440 vessel materials

The results of a neuronet simulation of the shift of the temperature of a ductile-brittle transition of VVéR-440 vessel materials as a function of the neutron fluence and chemical composition are presented. Existing data on the temperature shift of the ductile-brittle transition in control samples of the main metal and the weld-seam material in VVéR-440 vessels from different units of an operating nuclear power plant are used for model development. The model is used to determine the character and degree of influence of various alloying elements on the radiation embrittlement of vessel steel. The dependence of the shift of the temperature of the ductile-brittle transition on the neutron fluence is estimated. __________ Translated from Atomnaya énergiya, Vol. 101, No. 5, pp. 353–358, November, 2006.     

Real world applications of a fuzzy decision model based on relationships between goals for finance services and sequencing for the assembly of cars

Real world applications of a decision model of relationships between goals based on fuzzy relations are presented. In contrast to other approaches the relationships between decision goals or criteria for each decision situation are represented and calculated explicitly. The application fields are decision making for financial services and optimization of production sequences in car manufacturing.     

用科学发展指导中国造纸工业的健康持续发展

介绍了现代造纸工业基本特点,当前中国造纸工业存在的问题和机遇,落实科学发展观走新型工业化和循环经济道路的重要意义,以及有关技术进步与创新,纤维原料等问题.     

Studies of physical phenomena in semiconductor nanostructures using samples with laterally nonuniform layers. Photoluminescence of structures with n-type δ-doped layers

Photoluminescence of a structure based on GaAs with δ-doped n-type layers is studied experimentally at 77 K in the context of a previously suggested spectral-correlative method for investigating semiconductor structures with laterally nonuniform layers. This method makes it possible to study (for the same sample) the features of the observed multicomponent photoluminescence spectrum in relation to two parameters, i.e., the distance between the δ-doped layers and the width of a narrow InGaAs quantum well located between these layers. The results obtained make it possible to relate the observed exponential increase in the intensity of photoluminescence from the region of δ-doped layers as these parameters are varied to the variation in the ratio between the concentration of the holes laterally localized in the minimums of the fluctuation potential and that of free two-dimensional holes. An effect of stabilization of the energy position of the photoluminescence spectral lines is observed; this effect is related to the localization of holes in the potential well between the δ-doped layers. The experimental data obtained are consistent with the results of our numerical calculations.     

A new scheme for bidirectional WDM-PON using upstream and downstream channels generated by optical carrier suppression and separation technique

We propose a new bidirectional dense wavelength-division-multiplexing (DWDM)-based passive optical network using optical carrier suppression and separation technique to generate both upstream and downstream wavelength channels from a single laser. Thirty-two DWDM channels have been generated, and symmetric 10-Gb/s data transmission of a wavelength pair has been demonstrated.     

Self-excitation and synchronization in a multibeam microwave generator with electron-oscillator flows

Self-excitation and radiation of a multibeam spatially distributed microwave generator with centrifugal electrostatic focusing are considered. The transition to equivalent self-oscillators with slowly varying amplitudes and phases is substantiated. Examples of the directivity patterns and level lines of the field radiated in the master-slave and mutual synchronization modes and observed in a given section are presented.     

Plane Problem for Layered Composites with Periodic Array of Interfacial Cracks Under Compressive Static Loading

The current paper addresses the problem of 2-D modelling of the onset of failure process in a layered composite with periodic array of interfacial cracks under static compression along layers. The statement of the problem is based on the most accurate approach, the model of piecewise-homogenous medium. The condition of plane strain state is considered. The shear and the extensional buckling modes are examined. The laminae are modelled by transversally isotropic material (a matrix reinforced by continuous parallel fibres). The complex non-classical failure mechanics problem is solved utilizing finite element analysis. It is found that the 0°-plies volume fraction, the crack length and the mutual position of cracks influence the critical strain in the composite.     

丙烯酸二甲氨基乙酯的合成

以丙烯酰氯与二甲氨基乙醇为原料 ,乙醚为溶剂 ,过量的二甲氨基乙醇为缚酸剂合成了丙烯酸二甲氨基乙酯。较佳实验条件为 :丙烯酰氯 /二甲氨基乙醇 /乙醚 (物质的量比 ) 1∶2 .0 5∶5 .6 ,反应温度 5℃ ,反应时间 4h ,w(吩噻嗪 ) 0 .5 0 %,产物为无色透明液体 ,相对密度 0 .943 1( 2 0℃ ) ,折光率为 1.435 2 ,收率大于 91%。