有效电阻

Volume integral equation method has been used to calculate forward and inverse problems of 3D electromagnetic fields in homogeneous half-space.

0引言在电磁法勘探中，利用体积分方程计算三维地电磁场，由于数据点只分布在电阻率异常区域[1~3]而不是整个三维空间，因而与有限元法和有限差分法相比其计算量相对较小，是进行地电参数正反演计算的有效方法。

The key point with this method is the identification of terms, known as workless forces, which appear in the dynamic equations of active filter but do not have any effect on the energy balance equation of the closed loop.

基于此，将PBC方法与自适应控制相结合，实现线路参数与负载变化时参考谐波电流的准确跟踪，并有效抑制由电阻、电感变化引起的跟踪误差。

When used as a zener diode/resistor combination replacement, the LM78LXX usu- ally results in an effective output impedance improvement of two orders of magnitude, and lower quiescent current.

当作为一个齐纳二极管/电阻组合取代后，LM78LXX珠盟友在一个有效的输出阻抗两个数量级的改善效果，并降低静态电流。

The results showed that the current flowing between working electrode and auxiliary electrode were limited in a certain area by the apertural current limit sensor, and the noise disturbance and the IR drop caused by soil resistance were well eliminated by wavelet transform and Levenberg-Marquardt algorithm respectively.

结果表明，小孔限流型传感器具有明显的限流效果，小波变换和Levenberg-Marquardt算法能够有效消除充电曲线数据中的噪声干扰和土壤电阻影响。

The quality problem of resistance reducing material and its misemploy may be existed. The resistivity of resistance reducing material, the rate of steel corrosion, The stability of resistance reducing material and available time are considered.

因此就降阻剂的选择、使用提出了应综合考虑降阻剂自身电阻率、对钢接地体的腐蚀率、对环境有无污染和降阻剂的稳定性和长效性等因素，通过技术经济分析有效长期稳定地发挥降阻剂的降阻效果，减少对接地装置的腐蚀。

On the basis of studying reservoir parameter model, setting up and forming invasion water characteristic method, mobile water analyzing method and resistively intersection method, etc.

在储层参数模型研究基础上，建立并形成了侵入特徵法、可动水分析法、电阻率交会法等解释方法，有效提高了油水层解释符合率，为勘探生产和储量评价提供了技术支援。

The calculation example shows that the resistivity of formation water in shaly sand can be effectively determined with the improved SP model.

利用改进的自然电位模型进行的实例计算结果表明，该模型可以有效地用于确定泥质砂岩地层的地层水电阻率。

The theoretical and experimental comparison of three effective medium resistivity models in laminated and dispersed shaly sands is addressed in detail.

针对用于复杂泥质砂岩油气层解释的3种混合泥质砂岩有效介质电阻率模型，从理论和实验角度，进行了全面系统的比较。

For acquiring the real-time data of grounding resistance of electric apparatus,a practical design of multi-channel synchronal data acquisition based on FPGA and MCU is designed to ensure the electric apparatus in good grounding state,and the operating speed of system is improved significantly by processing ADCs in the same time.

为了实时采集各种电器设备的对地电阻数据，保证各设备良好的接地性，设计了一种很实用的基于FPGA和MCU的多路同步数据采集的方案，通过对多片ADC进行同步处理，有效地提高了系统运行速度。

Based on the electric models for shaly sands and tuffaceous sands, this text derived modelsof saturation bored with water for the tuffaceous sands: Tuffaceous sand S-B Model andEffective Medium HB Model;The first supposed that the parts of shaly sands and thetuffaceous part were electric parallelly, and the other considered the electric rock matrix as sandmatrix, tuffaceous matrix and shaly matrix were parallel, and ignored the difference betweenwater bounded with shaly sand and water in the formation.

基于泥质砂岩的导电模型并结合凝灰质砂岩骨架导电的特点，建立凝灰质砂岩含水饱和度导电模型：凝灰质砂岩 S-B 模型和有效介质 HB 电阻率模型；前者假设凝灰质部分与泥质砂岩部分并联导电，而后者将凝灰质砂岩骨架导电看成砂岩骨架颗粒、凝灰质颗粒和泥质颗粒的并联导电，并忽略粘土结合水与地层水导电性的差异。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷