Metastable He deexcitation at semiconductor interfaces

A review is given of the application of metastable deexcitation spectroscopy (MDS) to the study of the interface formation between semiconductors and different materials. In particular we present an overview of the results obtained on nanostructured interfaces, where strain and reaction between the substrate and the overlayer atoms drive the growth mode and the morphology of the system. As prototypical examples we discuss the growth of CaF₂ on silicon and rare earths (Yb, Er) on silicon and gallium arsenide. The mechanisms and chemical reactions which bring to interface formation are examined on the basis of MDS results and their comparison with photoemission.     

The Metal-Dielectric Resonator Method of Measuring the Parameters of Radio Materials

The use of symmetrical H- and E-modes and asymmetrical E-modes in a longitudinally anisotropic dielectric cylinder with metal mirrors at the ends to measure its permittivity and dielectric loss tangent is considered. It is shown that the method has wider possibilities compared with the IEC-61338 recommendations. The results of a measurement of the dielectric parameters of a number of materials in the 2–78 GHz frequency band, including the permittivity tensor of sapphire, are presented. __________ Translated from Izmeritel'naya Tekhnika, No. 9, pp. 65–70, September, 2005.     

Tailoring the adhesion of optical films on polymethyl-methacrylate by plasma-induced surface stabilization

Adhesion of plasma-deposited optical and protective coatings, such as amorphous hydrogenated silicon nitride, SiN_1.3, on polymethyl-methacrylate (PMMA) substrates has been found to be limited by a cohesive failure inside the PMMA bulk. Using direct exposure to a low pressure plasma in helium or to vacuum ultraviolet (VUV) radiation generated from plasma, the adhesion of SiN_1.3 at high humidity and elevated temperature has been substantially increased. Using a multitechnique analytical approach, the enhanced adhesion was attributed to the initial etching of the weak boundary layer followed by formation of a crosslinked, graded, mechanically stabilized layer in the interfacial region (interphase), which possesses a physical thickness of 50 to 100 nm and a microhardness of about 2 GPa.     

用于BaF2闪烁光慢成分抑制的膜系设计及制备

利用BaF2闪烁光快、慢成分处于不同波段的性质，设计出了具有特定带隙的膜系结构，用于抑制发射光谱中的慢成分。在保证快成分具有一定透过率条件下，实现了对BaF2闪烁光慢成分的全方向抑制，使晶体的快慢比得到很大提高。从膜系γ射线辐照损伤的结果可知：辐照对膜系透射带和截止带的影响不大，辐照后的膜系仍能满足抑制要求。     

选频光释光断代初探

介绍了一种新发展起来的光释光测定年龄的技术－选频光释光技术。该技术使用的设备是光释光谱仪－BG1999。一年来该谱仪运行正常，性能稳定；实验结果令人信服。     

电力线用电负载对企业电力线载波机通信质量的影响及解决措施

对企业电力线载波通信质量较差的原因进行了分析，认为噪音的产生与电力线上各类用电负载的开闭及大功率电机的转速有关，并提出了相应的解决方法。     

自行车群体流的在线实时测量

本文提出了一种利用环形线圈采用动态频差法配合模式识别技术实现对自行车群体流自动检测的方法。讨论了该方法的基本原理、识别模型及据此方法研制成的在线实时智能式自行车群体流量测量仪的试验结果，其测量准确度达８５％以上，数据以５秒时间间隔存入内存或上位机。此样机在现场连续运行３年多，已获满意结果。     

加速基因方法在最大流量频率曲线参数估计中的应用

基因方法是基于自然选择和自然基因机制的并行随机自适应工程模型参数全局优化估计的通用数值方法。它不限制模型结构、优化准则、被估参数的数目、约束条件等，已开始广泛用于各种工程模型的优化设计之中。文中对它的原理、步骤、特点进行初步探讨，并针对基因方法的弱点，作者提出予以改进的加速基因方法，后者在最大流量频率曲线参数估计中得到成功应用     

塔机动态特性的研究

分析、比较了当前塔式起重机动态特性研究中几种常用的方法，着重介绍了动力有限元法，利用ＡＬＧＯＲ有限元软件对实例进行了计算，得到了满意的结果。     

多回路网络化控制系统中优化采样频率的确定

在多回路网络化控制系统中，通讯资源的共享和网络传输的时延为系统分析和设计带来新的问题．运用非线性规划理论，分析和推导了多回路网络化控制系统中采样频率优化问题，并由推导过程归纳出易于计算机编程实现的工程化求解方法．通过仿真示例验证了所提出方法的有效性．