炉膛高度的选取对高温过热器工况影响的研究

文中从辐射换热的基本原理和简化了的辐射换热模型出发，定量分析了炉膛高度的变化对炉膛出口高温过热器辐射热强度的影响，其结果对在电站锅炉的设计和运行中研究及解决过热器起温问题有一定的参考价值。     

深凹露天矿高台阶开采新水平准备方法的探讨

以南芬露天矿现有的自然条件和装备水平为基础，提出了两种由１２ｍ台阶开采向上盘１８ｍ高台阶剥岩、下盘１２ｍ台阶采矿的开采过渡方案，两方案的平沟段高分别为１８ｍ和１２ｍ，通过新水平准备工程量和准备时间的计算比较，结果表明平沟段高为１８ｍ的方案较优。     

Effects of flying height deviations on glide height tests for manufacturing hard disks

In this study, theoretical analysis and experiments were carried out to investigate the effects of avalanche-point deviation and the deviation between the calibration and test-flying heights during the glide head calibration in the glide height tests for manufacturing hard disks. To obtain accurate glide height test results and improve the reproducibility of the test, flying height control should be carried out by limiting the acceptable deviation range of the flying heights of the glide heads. When the avalanche-point deviation is zero, the test results using different calibrated rails (or heads) are the same when they are used to detect the same defect. To avoid wrong test results due to avalanche-point deviation, the test-flying height should be the same as the calibration flying height because the difference of the output voltages of any two rails (or heads) is zero in this case. If these two deviations cannot be eliminated completely, the calibration and test-flying heights should be carefully selected because the error still can be minimised depending on the selection of the flying heights.     

似大地水准面精化成果在水利工程测量中的应用

结合广西某大型水利工程GPS控制网实际案例,对GPS大地高转为正常高的高程转换方法进行了介绍和分析,采用广西似大地水准面精化成果进行GPS高程转换,并进行了精度分析,提高了高程测量精度和效率。     

估计大气电磁级联簇射起始点位置的几种模型(Ⅰ)

在利用高山乳胶室对由宇宙线导致的超高能核作用进行的研究中,精确估计大气电磁级联簇射的起始点位置(即族的产生高度)是很困难的.本文介绍了目前估计族的产生高度的几种方法,及其所依据的物理模型.对各种方法的适用范围也作了说明.这是本文的第一部分,介绍π~0介子耦合及γ光子转换为电子对的有关模型.     

底部框架—抗震墙结构设计中有关问题的探讨

针对底框结构设计中存在的问题，从底层层高的取值、抗震墙的布置及上下层侧向刚度比、边缘构件的设置及其他应注意的问题，进行了分析探讨，提出了正确解决这些问题的方法。     

采用铜圆柱体试件确定螺旋摩擦压力机的做功能力

本文叙述了采用铜圆柱体试件确定螺旋摩擦压力机做功能力所要考虑的各种影响因素,分析了各种因素对计算结果影响的变化规律。在保证较高精度的条件下综合出一可简化计算过程的确定做功能力图表。     

测量激光线宽的一种新装置

介绍了一种新的仅用一台激光器测定激光线宽或频率稳定的测量方法，用稳定的无源腔透过曲线腰处斜率将激光的频率扰动转为电压扰动。用所研制的测量装置对自制的边疆波染料激光频率的线宽和频率稳定性进行了测量。     

NUMERICAL SIMULATION OF SEA SURFACE DIRECTIONAL WAVE SPECTRA UNDER TYPHOON WIND FORCING

Numercial simulation of sea surface directional wave spectra under typhoon wind forcing in the South China Sea （SCS） was carreid out using the WAVEWATCH-Ⅲ wave model. The simulation was run for 210 h until the Typhoon Damrey （2005） approached Vietnam. The simulated data were compared with buoy observations, which were obtained in the northwest sea area of Hainan Island. The results show that the significant wave height, wave direction, wave length and frequency spetra agree well with buoy observations. The spatial characteristics of the signifciant wave height, mean wave period, mean wave length, wave age and directional spectra depend on the relative position from the typhoon center. Also, the misalignment between local wind and wave directions were investigated.     

Optical, electrical and structural investigations on Cd1−xZnxSe sintered films for photovoltaic applications

II–VI polycrystalline semiconducting materials have come under increased scrutiny because of their wide use in the cost reduction of devices for photovoltaic applications. Cd_1−xZn_xSe is an important semiconducting alloy because of the tunability of its physical parameters such as band gap and lattice parameters by controlling its stoichiometry. Many more material characteristics of it would be altered and excellently controlled by controlling system composition x.Polycrystalline thin films of Cd_1−xZn_xSe with variable composition (0x1) have been deposited onto ultra-clean glass substrates by sintering process. The optical, structural and electrical transport properties of Cd_1−xZn_xSe thin films have been examined. The optical band gap and optical constants of these films were determined by using double beam spectrophotometer. The DC conductivity and activation energy of the films were measured in vacuum by two-probe technique. The Schottky junction of Cd_1−xZn_xSe with indium was made and the barrier height and ideality factor were determined using current–voltage characteristics. The nature of sample, crystal structure and lattice parameters were determined from X-ray diffraction patterns. The films were polycrystalline in nature having cubic zinc-blende structure over the whole range studied.Sintering is very simple and viable compared to other cost intensive methods. The results of the present investigation will be useful in characterizing the material, Cd_1−xZn_xSe, for its applications in photovoltaics.