查询词典 resistivity

D resistivity inversion of a vertical line source of current and a method of constructing Jacobian matrix are introduced in this paper.

本文叙述了相应的反演理论和偏导数计算方法。

In the research of prescription, through the experiments we knew the influence from the Nb_2O_5 or Y_2O_3 single donor doped on high-temperature PTC ceramic, and got the curve graph drawing the resistivity and mixing quantity. In order to restrain lead volatilize and mix the rang of donors to neutralization the harmful acceptor impurity in raw materials, adopt the prescription design of Nb_2O_5 and Y_2O_3 double donors-doped. From the result, we know that regulation proportion of Nb , Y double donors, can make high-temperature PTC ceramics semiconducting, the pottery demonstrates good electric performance.

为了能够更有效的抑制铅挥发，并且使掺杂范围能够更好的调节，以"中和"原材料中的有害受主杂质，在配方设计中采用了Nb_2O_5和Y_2O_3双施主掺杂的配方，由结果可知，适当的调节Nb、Y双施主掺杂总量及Nb、Y掺杂比例，可以使高温PTC陶瓷充分的半导化，陶瓷表现出良好的电性能。

Many experiments were carried out to investigate the relationship between the content of donor or acceptor with room temperature resistivity.

本文在综述低电阻率BaTiO〓PTCR陶瓷材料的制备和理论研究现状的基础上，提出研究中存在的问题。

And may help the flesh to increase the resistivity, reduces the skin sensibility phenomenon affably, the repair and maintenance cell, causes the flesh to be healthier.

并可帮助肌肤增加抵抗力，舒缓降低皮肤过敏现象，修护细胞，使肌肤更健康。

Although in an intermediate water depth the airwave and the signal from the deep resistivity arrive at about the same time, one can still see a clear anomaly compared to the background model without hydrocarbon reservoirs.

虽然在中等深度的海水区空气波和来自深部电阻体的电磁信号几乎同时到达，但与不含有油气藏的背景模型相比，仍可以看到明显的异常。

This paper analyzed thoroughly the transient electromagnetic field analytic expression in homogeneous half space, discovered that the transient response curve has a characteristic of translational expansion and contraction with the underground conductivity, transmit loop length and observation time. According to that, we proposed a new direct method to calculate full time domain apparent resistivity.

深入分析了均匀半空间中瞬变电磁场的解析表达式，发现瞬变响应曲线随地下电导率、发射回线边长与观测时间具有平移伸缩特性，并据此提出了一种新的直接计算全区视电阻率的方法。

Point out the electromagnetism signal produced by human campaign not be noise completely, in which, part has formed useful signal. Analyse through error theory, have gotten the mathematics relation of phase error and apparent resistivity error.

引入CSAMT的理论，对MT勘探中电干扰和磁干扰进行了研究，从理论上证实了磁场的信噪比要优于电场的，指出人类活动所产生的电磁信号并不全部是干扰，其中一部分构成了有用信号。

The result shows that the mixed boundary condition can greatly reduce the calculation area without affecting accuracy of the solution.It is followed by the higher accuracy of Dirichlet boundary condition which makes the boundary error greater when measured points is near the boundary, so we must take a sufficiently large border region.The homogeneous boundary condition has relatively large error, but the use of non-triangle poles devices makes apparent resistivity calculation error become small, because of elimination of the effect on potential difference for the infinite boundary. In inversion, in order to save computing time, homogeneous boundary conditions are often used to perform finite element forward calculation.

结果表明，混合边界条件精度最高，可大大缩小求解区域而不影响计算精度，其次是Dirichlet边界条件精度较高，但测点越靠边界误差会越大，必须取足够大的边界区域，齐次边界条件的误差比较大，但如果采用非二极装置，通过电位差计算得到的视电阻率，由于无穷远边界对电位差的影响基本消除，视电阻率计算误差与混合边界条件下的接近，在反演中，为了节省计算时间，经常使用齐次边界条件进行有限元正演。

Based on the theory of Core-Core dispersion,the apparent amplitude frequency was computed using the complex resistivity on elliptical sphere with central gradient array.

基于柯尔-柯尔频散理论，采用中间梯度上椭球体的复电阻率计算相应的幅频率，讨论椭球体的充电率、中心埋深和长轴倾角对幅频率异常和曲线形态的影响；研究幅频率资料的反演算法。

Below T_(M1),the resistivity increase under photo inducing. The maximum resistivity change(Δρ/ρ_0) in the La_(0.82)Te_(0.18)MnO_3 sample can reach 51.1% in 253K which is more large than that of hole-doped manganites. Above T_(M1) there is a photoconduction.

在低温区，激光的照射使得薄膜电阻率增大，其中La_(0.82)Te_(0.18)MnO_3在253K下的电阻变化率达到峰值51.1%，这比已有的报道中相同条件下的空穴掺杂材料有很大的提高；在高温区激光作用产生了较小的光电导现缘。

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。