电阻率

There are many kinds of sensors , and the gas-sensor is an important kind, whose theory is to make use of the variable of resistance under the sensitive gas condition, resulting in the change of electricity variable in the circuits.

传感器的类型有很多，而其中很重要的一种就是电阻型气敏传感元件，它的原理就是利用敏感电阻在气体中电阻率改变，从而引起电阻的变化进而通过电路中电学量的改变来测量敏感气体的存在。

In addition,compared with CR method,the method has many advantages,such as sensitivity to the difference in resistivity or chargeability between a geological target and its country rock,higher efficiency and lower product cost etc.

此外，该方法与复电阻率法相比，具有对目标地质体和围岩的电阻率和极化率差异反映灵敏、效率高、成本低等优点，所以它是一种值得推广的找油气的电法勘探方法。

The resistivity was calculated following the equation ρ=PA/L, where ρ is the resistivity in kΩ.cm, R the electrical resistance in kΩ, A the latten area in cm2, and L the distance between electrodes in cm.

电阻率的计算公式后，ρ=尼龙/ L，其中ρ是在kΩ。cm电阻率，研究在kΩ的电阻，一个平方厘米的黄铜薄片地区，和L电极之间厘米的距离。

The surface resistance and volume resistance of sample were measured by ZC-36 Megohmmeter and the corresponding resistivity could be calculated. The tensile strength and elastic modulus of specimen were characterized by tensile machine.

采用ZC36型高阻位电阻计测定样品的表面电阻和体积电阻，并计算出相应的电阻率，本论文还测定不同含量MWNTs的样品的拉伸强度及弹性模量等性能，分析了不同含量的MWNTs对复合材料导电性和力学性能的影响，并总结出其规律。

When mixed into the same carbon fiber quantity is 1.0%, differ age material's AC impedance chart is discrepancy very much, along with to hydrate age's add, C-S-H gel isa great deal of form, the solution resistance at the concrete is gradually aggrandizement, the carbon fibre of here qua transmit electricity quality disperse would leading effect of conductance, along with the add of exterior load, the transmit electricity quality of concrete is almost nothing change, till breakage, resistance change rate tempestuousness add, and that the resistance change rate along with inside stress linearity add of corbon fibre concrete in elasticity phase, when near peak value load, resistance rate just gradually add, indicate the test sample would be about to breakage.

当碳纤维体积掺量同为1.0%时，不同龄期材料的交流阻抗谱相差很大，随着水化龄期的增长，C-S-H凝胶大量形成，水泥基材料中的溶液电阻逐渐增大，此时作为导电性分散相的碳纤维将起电导的主导作用。随着外部荷载的增加，基准水泥基材料的导电性几乎无变化，直到破坏时，电阻变化率剧烈增大，而碳纤维水泥基材料在弹性阶段其电阻变化率随内部应力线性增加，当接近峰值荷载时，电阻率才逐渐增大，预示试件即将破坏。

An experimental investigation into the effects of pure Ag and AgAu alloys sheath materials on the properties of Bi (2223) multifilamentary tapes is presented in this paper. The experimental results show that the drastic reduction of thermal conductivity and the increase of resistivity by the addition of Au into the Ag matrix can be achieved.

Bi（2223）/Ag及Bi（2223）/AgAu高温超导多芯带材低温下的热导率和横向电阻率实验研究结果表明，采用AgAu合金代替纯银作为包敷材料可以显著降低Bi（2223）高温超导多芯带材的热导率和提高横向电阻率。

The resistivity of filled skutterudites increases with the increase of the filling fraction. It originated from the decrease of carrier concentration in the skutterudite for the samples with high filling fraction and also the difference of the content of Fe Sb〓 and Sb in the samples.

填充型方钴矿材料的电阻率随填充率的提高而增大，这一方面是因为镧的引入使材料的载流子浓度降低，另一方面低填充率的样品中的低电阻率还与样品中的FeSb〓和Sb杂质的存在有关。

Based on the hypothesis of Cole-Cole model, a new recursive inversion method is used in the inversion of complex-resistivity sounding curves over multi-layered earth with Schlumberger array without electromagnetic couping.

在Cole Cole模型假设的基础上，用一种新的递推反演算法对无电磁偶合影响时的水平层状大地对称四极装置复电阻率测深曲线进行反演，得出了层状大地上视电阻率、视时间常数、视频率相关系数、视充电率的视真频参数测深曲线。

Improving vertical resolution for density curves is by means of restructuring the response from large and small spacing sondes and borehole effect correction factor and coherence factor are used. Form the principle of GR logging, calculate volumes in investigating areas taken by borehole, formation, up and low shoulder beds, along with distance between center of gravity of the four unit bodies and detector. Based on the above, the weighting function of each unit body to GR signal contributions are established, thus realizing processing of GR logs with high resolution. The resistivity logging model uses "resolution matching" method to improve the resolution of the logs. After the process, PNN model is made to recognize the oil-gas-water bed. Compared with BPNN, the net work is featured swiftness, accuracy and ease of practical application.

提高密度测井曲线垂直分辨率是通过对重新组合长、短源距探测器响应的算法来提高补偿密度曲线的垂直分辨率，并加入井眼影响校正因子和相关性因子；自然伽马测井模型从基本原理出发，扣除井的影响，计算井筒、地层及其上下围岩所占探测球域体积及其重心到探测器的距离，以此建立各单元体对伽马测井信号贡献的权函数，通过权函数逐层计算不同厚度地层条件下各的单元体权因子，实现自然伽马曲线高分辨率处理；电阻率校正模型应用&分配率匹配&模型，应用低分辨率曲线提高为高分辨率曲线：曲线校正后，利用常规测井资料并且结合校正后的密度、伽马、电阻率等三个对判断油水层有利的指标，通过概率神经网络模型识别储层流体性质，较以前的模型，不仅极大的提高识别正确率，同时与普通神经网络相比较，提高了网络的运行速度和实用性。

Some of the applications that use this method include testing two terminal high resistance devices, measuring insulation resistance, and determining the volume and surface resistivity of insulating materials.

采用这种方法的应用工作包括测试两端高阻器件、测量绝缘电阻、确定绝缘材料的体电阻率和表面电阻率等。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。