查询词典 sph.

During the calculation the results got by quintic spline kernel was the best so it was chosen as the proper kernel for the SPH simulation. By comparison of the simulation results got by SPH and finite volume method, it was proved that the buffer cells method proposed in the SPH simulation to implement the Dirichlet boundary conditions was accurate, and this is of great importance for the simulation of flows pass a pipe. At last, the SPH method was improved to simulate the liquid-solid two phase flows and the results show that this method was appropriate for the simulation of flows containing viscous fluid and macroscopic solid components. Now the two methods are both able to predict the continuum flows and rarefied flows severally, but the hybrid program still has some aspects to be improved.

首先用标准算例验证了SPH方法的理论模型和计算程序的准确性；通过比较确定选用五次样条核作为计算低雷诺数下的粘性连续流动时的核函数；采用SPH方法和有限体积法分别对同一管道流动进行了对比计算，证明了本文提出的边界缓冲区方法在实现SPH方法中的流体边界条件时的有效性，解决了SPH方法模拟管道流动时的一个关键问题；巧妙地使用SPH方法对化工分离流动中常见的固液两相流及固液耦合作用进行了模拟尝试，获得了较好的结果；在跨尺度计算方面，目前两个子程序已经能够分别模拟连续的和稀薄的二维管流问题，二者的耦合计算程序还处于调试和优化阶段，各个参数对于计算精度和计算速度的影响规律仍在探索中。

Nested reverse transcription polymerase chain reaction revealed that c-SPH mRNA is expressed most in tissues with the highest hemocyte abundance.

巢状反转录聚合酶连锁反应显示c-SPH mRNA的讯号在血球中最为强烈。

In the numerical simulation, the new formulation not only remedies the boundary deficiency problem in the original SPH but also more efficiently repairs the truncated integral in kernel approximation caused by discontinuity and eliminates the errors from particle inconsistency in discontinuous region.

比较不同SPH方程近似二次函数的结果，新方法不仅改进了传统SPH方法存在的边界缺陷问题，同时在非连续区域内也能更有效地修复由非连续引起的核近似截断积分和消除粒子不一致性所造成的误差。

Three different numerical iterative algorithms are developed and the accuracy and stabilities of them are compared. Tension and compression instabilities are studied and effects of Conservative Smoothing Approach and artificial viscosity on stabilities are discussed. Based on Taylor series expansion, Modified SPH method is proposed. The discrete forms of the function and its first derivative estimations of the kernel function are deduced in both one and two dimensional space.

讨论了三种不同的数值迭代算法对计算精度和稳定性的影响；分析了不稳定性产生的根源，包括拉伸不稳定和压缩不稳定，探讨了保守光滑算法和人为粘性对稳定性的影响；在Taylor展开的基础上提出了一种修正的SPH方法，并推导一维和二维情形下函数的核估计和函数的一阶导数核估计的离散形式，结果表明，二维情形下MSPH方法可以很好的改善边界粒子的计算精度。

According to research, the coupling method of SPH and FEM for projectile pene trating into concrete subjected large strain and disˉ continuity is quite accurate.

研究结果表明，FEMˉSPH耦合方法能够较为准确的模拟大变形、不连续介质的动力问题，并可避免网格重分或网格消蚀，同时又具有较高的效率。

The purpose of the research is focused on finding the theory characteristic and potential advantage of SPH, and it is the basic theory and algorithm for further research and improvement of corresponding problems.

研究工作在了解SPH方法的理论特点和潜在优势的同时，也为相关问题的深入研究和改进奠定了理论和算法基础。

The authors discuss elemental compositions and properties of SPH - 1 water-base graphite coating with sodium bentonite and carboxy methyl cellulose as thickner and graphite, soapstone powder and silica powder as basic constituents.

本文讨论了以钠基膨润土和羧甲基纤维素钠作为稠化剂，石墨、滑石粉、石英粉并用的SPH-1型水基石墨涂料的基本组成和性能。

Moreover, the vorticity field was added to the SPH model efficiently, which improved the details of particles' movement.

在SPH模型中，较为高效地加入了漩涡场的计算，增加了粒子运动的细节。

However if h is allowed to evolve freely to maintain a constant number of neighbours in SPH summations , such unwanted effects can be avoided and accuracy improved .

若随时调整h的值使得SPH方法计算粒子的邻近粒子数总和保持不变，则可以避免这种有害的影响，使准确性得到提高。

Firstly, morphology, lactate dehydrogenase pattern and random amplified polymorphic DNA fingerprinting of three continuous marine fish cell lines of FG, SPH and RSBF, derived from flounder gill, sea perch heart and red sea ...

本文首先从形态、蛋白质和DNA三个层次水平对牙鲆鳃细胞系FG、鲈鱼心脏细胞系 SPH和真鲷鳍细胞系RSBF的特性进行了分析，并分别与其所对应的原代培养组织作了比较。

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。