加拿大语言量表与英语口语能力培养

对国外语言量表的考察和分析，不仅对我国统一的语言能力标准的制定具有重要的参考价值，而且有助于改善我们的日常英语教学水平。在介绍加拿大语言量表2000（CLB2000）的口语标准基础上，进一步分析了英语教师培养学习者英语口语能力的策略。     

Testing and Modeling for Energy Dissipation Behavior of Velocity and Displacement Dependent Hydraulic Damper

A passive energy-dissipating device, velocity, and displacement dependent hydraulic damper (VDHD), is developed to reduce the seismic response of structure. This device is comprised of a hydraulic jack, check valve, relief valve, and throttle valve. The numerical analysis model for SAP2000 nonlinear analysis program is proposed to simulate the energy-dissipating characteristics of VDHD. The analysis results of this model compared with the seismic resistant tests reveal that this proposed model can accurately describe the actual energy-dissipating behavior of VDHD. The efficiency of VDHD is confirmed using this proposed model for carrying out numerical analyses of bare building, building added with bulking resistant bracing (BBR), and VDHD. The energy-dissipating capabilities of VDHD are performing excellent displacement and acceleration control with various ground magnitudes; being an energy absorber to absorb mechanical energy in the structure and resist structural movement; and gathering the advantage of BRB.     

高原公路纵断面线形与驾驶员脑电特性的试验分析

为了解驾驶员在高原公路行车时,其脑电特性与纵断面线形的关系,探究适宜的公路线形,选在帕米尔高原G314国道进行驾驶试验。通过对比经过181个变坡点附近受测驾驶员脑电(EEG)的变化特征,选取脑电α频段与β频段的平均功率比R作为评价驾驶员心理紧张度的脑电特性指标,定量分析R随海拔、竖曲线半径r、坡差ω的变化规律;同时建立关系模型。研究表明:R与海拔、竖曲线半径、坡差之间的相关性均较强;R与海拔、绝对坡差呈正相关,与r呈负相关。表明海拔的升高,绝对坡差的增大,竖曲线半径的减小,对驾驶活动是不利的,驾驶员的生理不适状况会随之逐渐增加,疲劳感逐渐增强。     

基于声发射旋风分离器内颗粒粒度分析

采用声发射技术对旋风分离器内颗粒粒度进行分析,获得了声发射信号结构与分离器内气固两相运动行为的对应关系。选用0.4 mm、0.7 mm、1.5 mm和2 mm的活性炭颗粒进行实验,将采样得到声发射信号进行Daubechies二阶小波的1~9尺度分解,用R/S算法分别求取各个频段的Hurst指数。结果表明,声发射信号具有多尺度特征,依据hurst指数的不同,将其划分为微尺度、介尺度、宏尺度,分别反映颗粒间的无规则运动、主体流相对于系统运动或不同主体流之间的相互运动,整个系统相对于外界环境随时间的变化。在同一质量流量下,计算出各颗粒粒径对应的微尺度,介尺度分别所占总能量的比值。实验发现,固相颗粒粒径与其有很大的相关性;随着粒子尺寸的增大,微尺度信号所占的能量比率减少,介尺度能量所占的比率增加。声发射技术可用于旋风分离器内颗粒粒度的分析。     

Evidence for self-organized criticality in unscheduled downtime data of equipment

How to reduce downtime and improve availability of the complex equipment is very important. Although the unscheduled downtime（USDT） issues of the equipment are very complex, the self-organized criticality（SOC） is the right theory to study complex systems evolution and opens up a new window to the investigation of disasters, such as the sudden failure of the equipment. Firstly,SOC theory and its validation method are introduced. Then an SOC validation method for USDT of the equipment is proposed based on the above theory. Case study is done on bottleneck equipment in a factory and corresponding data pre-process work is done. The rescaled-range（R/S） analysis method is used to calculate the Hurst exponent of USDT time-series data in order to determine the long-range correlation of USDT data on time scale;at the same time the spatial power-law characteristic of USDT time series data is studied. The result shows that the characteristics of SOC are revealed in USDT data of the equipment according to the criterion of SOC. In addition, based on the characteristics of SOC,the overall framework of the prediction method for major sudden failure of the equipment is proposed based on SOC.     

大型细长钢筋混凝土柱整体吊装“双机五点吊”绳系方案研究

研究大型细长钢筋混凝土（R．C．）柱整体吊装“双机五点吊”绳系方案的最优绳系型式、最优吊点位置、最优绳元高度（对应最优绳长），以解决大中型火电厂的大型细长钢筋混凝土柱整体吊装问题。基于“吊装弯曲应变能力最小”准则确定了吊件最优吊点，进而获得最优绳系型式和最优绳元高度。研究结果可供大型细长钢筋混凝土柱整体吊装施工参考。     

AutoCAD2000绘制机械图样方法的探究

从AutoCAD2000的基本理论出发,本着在实践中丰富理论和提高机械设计能力的指导思想,系统地阐述了用AutoCAD2000绘制在机械设计和机械生产过程中起指导作用的机械图样——零件图和装配图的方法.为机械设计人员利用AutuCAD2000高效、快捷地绘制机械图样提供了一套简便、可行的途径.     

行业股票日收益率的长记忆性研究

运用修正R/S分析和V/S检验两种分析方法,对我国股票市场13个行业日收益率序列的长期记忆性进行了比较研究,得出了以下结论：在5%的显著水平下,农林牧渔业的日收益率在两种方法下均不具有长记忆性;传播与文化产业的日收益率在修正R/S分析中不具有长记忆性,而交通运输仓储业的日收益率在V/S分析下不具有长记忆性;除上述提到的行业外,其余行业的日收益率在两种分析结果下,均具有明显的长记忆性。     

B-值Dirichlet级数确定的整函数的(p,q)(R)级和(p,q)(R)型

利用Newton多边形研究了B-值Dirichlet级数确定的整函数的增长性,较方便地得到了B-值Dirichlet级数的(p,q)(R)级及型和下(p,q)(R)级与系数关系的若干结果.     

我国第三代移动通信的发展与展望

本文介绍了我国移动通信的演进，ＩＭＴ－２０００的目标和关键技术。对我国第三代移动通信的发展步骤和前景也进行了简要评述。