计算

The calculation results show that the hydrodynamic forces of purely heaving and pitching and its dimensionless frequency presente better linearity relation, and which indirectly verifies that this calculation method can be used to calculate the hydrodynamic coefficients of complicated shape submergible vehicle.

计算结果表明，纯升沉运动和纯俯仰运动的水动力与运动无因次频率呈现较好的线性关系，间接验证了所提出的计算方法适用于复杂外形潜器的水动力系数计算。

This paper discusses the latent parallel characteristic of the forward and backward substitution method in tidal current computation.

本文针对前推回代法的潮流计算的潜在并行特点，对前推回代的在数据结构表达方式进行研究，比较了各种数据结构形式并行性计算速度的影响，并进行了仿真计算。

A sunlit time computation model based on the DEM data in rough terrain is developed in this paper.

在广泛总结前人研究的基础上，提出了一个改进的、基于DEM数据的、起伏地形条件下的日照时间计算模型，在以往计算模型的基础上引入地球曲率修正因子Q，提高了模型的计算精度。

The regulation of gene expression is to have relations to the assembly of the DNA binding proteins which bind to DNA to initiate the transcription. Some of these proteins have the ability to promote bending or looping of DNA. The FIS protein regulates gene expression in Escherichia coli by this property of bending DNA. There are many researches to discover the mechanism of FIS protein binds to DNA. However the experiment data only show the supposititious results and figure out the model of FIS-DNA complex structure. This research uses molecular dynamics simulation to compute the detail of the interaction between FIS and DNA. We observed FIS prominently affects the DNA bending by the type of local bending. Analyzing the DNA structure properties, roll and slide, also demonstrates the local bending type and region. The hydrogen bonds between FIS and DNA are analyzed to compare with the experiment data. Finally we compute the binding free energy between FIS and DNA to estimate the result of simulation and compare with the value of λ-repressor-DNA complex.

基因的表现与结合於DNA促使DNA转录作用起始的DNA结合蛋白组装有关，一些这类的蛋白质具有促使DNA扭曲或将DNA形成环状的能力，FIS蛋白质即是藉由扭曲DNA的特性调控大肠杆菌基因的表现，目前已有很多的研究发现FIS与DNA结合的机转，然而这些实验的数据仅能显示推测性的结果，进而利用这些结果推论出FIS与DNA聚合体结构的模型，本研究利用分子动态模拟的方式计算FIS与DNA交互作用的细节，我们观察到FIS主要影响DNA的扭曲方式为DNA区域扭曲的类型，并且分析DNA结构特性roll与slide也指出扭曲方式为区域扭曲与其扭曲的区域，我们也分析FIS与DNA之间的氢键，并且与实验的资料作比较，最后我们计算FIS与DNA之间的结合自由能评估模拟的结果，并且计算出的值和λ-repressor与DNA聚合体结构的实验值作比较。

Based on the above study, a program is developed which calculate the modeled subgrid stresses, and is applied to simulate the turbulent flow in a plane channel. The computational result is compared with the data extracted form a DNS database, and the agreement is satisfactory. A numbers of physical phenomenon has been reproduced in the simulation, including hairpin vortex and counter-rotating rolls in near wall region, intermittent vortex structure, the maximum of pressure clustering in wall area and the high-speed fluid sweep into the low speed fluid, and the ability of the LES to simulate turbulent flow is well shown.

在对LES技术学习掌握的基础上，编制了亚网格模型的计算程序，在三维平板通道流动的具体计算中应用大涡模拟技术，并与DNS计算结果进行了比较，得到了满意的结果，三维通道中的重要流动现象被很好的预示出来，包括近壁面的发卡涡，对旋涡，间歇猝发涡结构，压力最大值向壁面的倾斜，高速流体对近壁面流体的下扫，卷掠等，显示了大涡模拟技术对湍流流动模拟的能力。

By comparison with some traditional differentiation methods, such as divided differences, by-hand coding and symbolic differentiation, AD is characterized by a lot of virtues, e.g., truncation error free, less running cost and less human labor required.

比起传统意义上的计算微分方法来，自动微分具有计算精度高、计算代价小及投入人力少等优点。

These issues mainly include simulation offlexible soil container, selection of dynamic constitution model of soil, simulation of the changing-status non-linearity on soil-structure interface, meshing, treatment of reinforcements in structure,using of symmetry principle and so on.

按照本文的建模原则和计算方法，对土-桩基-结构相互作用体系振动台试验进行三维有限元计算分析，计算中土体采用等效线性模型，利用面-面接触单元考虑土体与结构交界面的状态非线性。

The method is as follows, at first, to calculate the frequency response function of structure corresponding every blasting syntony ponderance, then to calculate the response of structure under this syntony ponderance by using frequency response function, at last, the response of the whole system can be worked out by superposition.

计算方法是先计算每一爆破谐分量对应于结构的频响函数，然后用频响函数计算出结构在此谐分量下的响应，最后用叠加法得到整个系统的响应。

The technical requirements of the de-excitation system for generators are discussed, including the technical parameters of field circuit breaker, the capacity of de-excitation resistor, the time of de-excitation, the operation conditions for generator de-excitation, etc.

分析讨论了灭磁系统设计的几个主要技术要求，包括磁场断路器的性能参数要求及其选择计算、灭磁电阻容量要求及其选择计算、对灭磁时间的要求、设计应考虑的灭磁工况等，提出了相应的设计计算方法以及在灭磁系统设计中应用ANSI/IEEEC37.18标准时应注意的几个问题。

The method of moment is often effectively used for solving electromagnetic scattering problems. This problem, however, involves a dense system of linear equations.

矩量法是一种常运用于计算电磁散射问题的有效方法，计算电磁散射问题就涉及到一个稠密矩阵的计算问题。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。