查询词典 double integral

This paper establishes mathematical models of unsteady and Non-Darcy low speed flow through the porous media and the double porous medium, and has obtained their solutions in an infinite reservoir through Laplace transformation, and their long time asymptotic solutions has been worked out, solutions on a bounded reservoir has also obtained through finite integral transformation and Laplace transformation.

从现场上各种水淹的实际资料来看，同一水动力的非均质油层系统中，渗透率相对较高的部分水洗之后，渗透率相对较低部分的油层却可以原封不动。而且，其渗透率可达达西级，含油饱和度可达80％以上。相对流动比(即同一水动力的非均质油层系统中，小层平均渗透率的最大值与其中不流动部分的小层平均渗透率的最大值相比)的比值在各种油层的生产实例中十分相近。一般的分布范围为3—7，常见的为4—6。实验室结果和生产实践基本相同。简单的注水和压裂对这一比值几乎无影响。

The technique made full use of the characteristic of PR controller which can realize zero steady-state error in AC input signal in stationary frame. In the method, the active and reactive current component in the vector control strategy were transformed in the stationary frame to achieve the objective of keeping the DC-link voltage constant, adjusting the power factor and decoupling the active and reactive power. Compared with conventional double close-loop proportional integral controller, the PR technique is better in harmonic compensation without the complex rotating frame transformation and the couple or feedback voltage which is easily influenced by temperature and circuit parameters. The control algorithm is easy to be realized while the robustness and power quality is improved.

该方法充分利用了PR控制器能够在静止坐标系下对交流输入信号无静差控制的优势，将矢量控制策略下的有功电流和无功电流分量转换到静止坐标系下进行调节，实现网侧变换器维持直流电压稳定和调节功率因数的控制任务和双馈电机有功、无功功率的解耦控制，与传统的双闭环PI控制相比，该策略无需繁琐的坐标旋转变换，不存在受温度及电路参数影响的耦合项和前馈补偿项，且易于实现对系统低次谐波电流的补偿，减小了控制算法实现难度，提高了控制系统的鲁棒性和电网电能质量。

The Galerkin's method solution of electromagnetic field integral equations for e lectromagnetic scattering problems of perfectly conducting object requires calcu lation of singular double surface integrals.

利用电磁场积分方程的伽略金法求解理想导体电磁散射问题时需要计算奇异性的二重面积分(即4维积分)。

Ship lock with double-hinged soleplate, which is developed based on the integral ship lock, is widely applied on silt-sandy foundation and fine-sandy foundation.

双铰底板式闸室结构是在整体式闸室基础上发展起来的一种型式，一般适用于粉砂、细砂地基，应用十分广泛。

The N + OH reaction system has no energy barrier in the entrance channel on the PES; instead, there are double wells along the reaction path, which leads to that the integral reaction cross sections are not strongly dependent on either translational energy or initial rotational and vibrational state.

计算还显示，由于N+OH反应入口谷没有能垒，而沿着最小能量反应路径有两个势阱，因此反应的积分截面并不强烈依赖平动能和反应物分子的初始振转态。

The author designs an extrusion head used to produce a kind of medical interventional catheter which adopts an integral core rod, a round-hole diffluent bracket and an extrusion head with double tubes ,and introduces the designing process in detail.

设计了一种医用微细介入导管的挤出机头，其特点是采用了整体芯棒、圆孔分流支架和双管机头结构，并详细介绍了该挤出机头的设计过程。

An integral core rod, a round-hole diffluent bracket and an extrusion head with double tubes to the extrusion head were applied in extrusion head designing,and the designing process of the ex-trusion head was introduced in detail.

mm的医用微细介入导管，设计了一种专用微管挤出机头，其特点是采用了整体芯棒、圆孔分流支架和双管机头结构，详细介绍了该挤出机头的设计过程。

An integral core rod, a round-hole diffluent bracket and an extrusion head with double tubes to the extrusion head were applied in extrusion head designing,and the designing process of the ex-trusion head was introduced in detail.

针对一种材料为低密度聚乙烯、外径1.0 mm、内径0.4 mm、壁厚0.3 mm的医用微细介入导管，设计了一种专用微管挤出机头，其特点是采用了整体芯棒、圆孔分流支架和双管机头结构，详细介绍了该挤出机头的设计过程。

FYB---double-direction angular contact thrust ball bearing is a bearing unit composed of an integral outer ring, a group of sectile inner rings, steel balls, cage assemblies and sealing.

FYB—双向推力角接触球轴承是由一整体外圈、一组剖分式内圈、钢球和保持架组件及密封组成的轴承单元，其结构紧凑体积小，可双向受力，旋转精度高，并可在承受很高径向负荷同时承受一定的轴向负荷。

In view of the concrete structure of double front axles steering, and base on related automobile theories and the connecting rod mechanism kinematics, this thesis theoretically analysis the multi-axle steering trapezia and the steering rotary arm mechanism, and establishes an integral space mathematical model of the steering system on the basis of previous achievement.

本文针对双前桥转向汽车起重机的具体结构，利用相关汽车理论和连杆机构运动学的知识，在消化、吸收、归纳、总结前人的成果上，系统、全面地对多桥转向汽车的转向梯形、转向摇臂机构进行理论分析，建立其转向系统的整体空间数学模型。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。