小学数学二年级上册“长度单位”单元自测题

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轿车后轮定位参数动态特性试验测试方法研究

以某典型中级轿车后轮为例,对轿车后轮定位参数动态特性试验测试方法进行了研究.设计制定了基于电-液伺服四通道车辆道路模拟试验台的后轮定位参数测量试验方案,在振动台架上测定该车后轮前束角和外倾角的动态变化特性,研究了扫频信号和随机信号加载和单双侧加载等不同的加载方式对测试结果的影响,并对试验结果进行了误差分析.研究表明,该车轮定位参数动态特性试验测量方法简单、可行,准确度较高,为车轮定位参数的动态特性的测取提供了新思路.     

煤粉浓度与风量的热探头测量方法研究

开发了长弦为10 mm、短弦为5 mm的椭圆型热探头,用于煤粉浓度与风量的测量.将热探头放入煤粉-空气输送管中,热探头1的长弦平行于来流,热探头2的短弦平行于来流.研究发现:热探头1对煤粉浓度反应迟钝;热探头2对煤粉浓度反应比较敏感.分析了气固两相流中的弛豫效应,提出了热探头1和热探头2在气固两相流中的换热准则关系式.将热探头1和热探头2的换热准则关系式相耦合,可用于测量煤粉浓度和风量,测量结果的相对偏差分别在20%和10%以内.     

Evidence of crustal ＇channel flow＇ in the eastern margin of Tibetan Plateau from MT measurements

Magnetotelluric （MT） survey has been carried out in the eastern margin of the Tibetan Plateau and its neighboring Shimian-Leshan area, Sichuan Province. Analysis of this MT data reveals that the electric structure of the Tibetan Plateau differ much from that of the Sichuan block. In general, the electric resistivity of crust beneath the Sichuan block in the east is larger than that of the eastern margin of the Tibetan Plateau in the west. The crust of the plateau is divided into upper, middle, and lower layers. The middle crust is a low resistivity layer with minimum down to 3-10Ωm about 10-15 km thick. It presumably contains partial melt and/or salt-bearing fluids with low viscosity, prone to deform and flow, producing a ＂channel flow＂ under the southeastward squeeze of the eastern Tibetan Plateau. This low-resistivity layer makes the upper crust decoupled mechanically from the lower crust. In the brittle upper crust, faults are dominated by left-lateral strike-slip and thrust motions, leading to surface rising and shallow earthquakes. The low-resistivity layer also cut the Xianshuihe-Anninghe fault zone into two sections vertically. In this region, the thicknesses of upper, middle, and lower crust vary laterally, producing a transitional zone in the eastern margin of the Tibetan Plateau characterized by thicker crust and higher elevation in the west and thinner crust and lower elevation in the east.     

减小万用表直流电压档测量误差的一种方法

通过对MF500型万用表测量直流电压引入的误差分析,得出利用公式计算法消除误差的方法。     

一种气动传输粉体质量流量测量方法

介绍了一种新型静电质量流量测量方法,该方法使粉体流经预先设置的电场,在粉体表面产生与粉体质量流量间有一确定关系的极化电荷,测量过程不影响流体在管道中的流动状态,测量装置简单,耐用,可直接得到质量流量输出,因此特别适合于工业过程控制。     

基于UML-RT模型的实时软件规模测量方法

COSMIC—FFP是可用于实时系统的第2代功能规模测量方法．本文着重探讨COSMIC—FFP模型方法,并将其应用于实时UML需求分析模型中．     

半导体器件的温度测量

测量正在工作的半导体器件温度有很多种方法。这些方法大概可以分为三类：电学方法、光学方法和物理接触方法。介绍了各种方法的物理基础,并且对每种方法的优势、劣势以及空间解析度及需要特别注意的问题等进行了讨论。