数值技术

Affecting factors,research technical means and methods of improving strength of weldlines as well as parametric optimization and numerical simulation technology were discussed.

综述了注塑过程中熔接缝形成的组织结构及其力学性能研究的进展，讨论了熔接缝的特点，着重阐述了熔接缝强度的影响因素、研究的技术手段和提高熔接缝强度的措施，以及熔接缝加工参数优化与数值模拟技术。

Three dimension modeling technique includes three dimension finite element method, three dimension photoelasticity experiment method and modeling with other materials.

该技术包括三维有限单元计算数值模拟、三维光弹实验模拟和其它材料的工程实验模拟技术。

With the development of metal casting technology, sand core is playing a more important role in modern casting production.

随着计算机、信息、自动化等各种新兴科学技术在制造业中的广泛应用，它们与传统制造技术相结合而形成的数值模拟技术得到了迅速的发展。

High order symplectic schemes of three-dimensional time-domain Maxwell's equations are constructed with symplectic integrator technique combined with high order staggered difference. The method is used to analyzing stability and numerical dispersion of high order time-domain methods and symplectic schemes with matrix analysis and tensor product.

利用辛积分技术与高阶交错差分技术，建立求解三维时域Maxwell方程的高阶辛算法；结合电磁场中的物理概念，借助矩阵分析和张量分析理论，获得高阶时域方法及高阶辛算法的稳定性和数值色散性的统一处理新方法。

Chimera grid technique is applied to viscous flow analysis of the wall interference in the wind tunnel.

3根据嵌套网格技术的原理，结合风洞内流场的特点，将嵌套网格技术应用于风洞壁干扰的Navier-Stokes数值模拟，发展了相应的洞壁干扰分析软件。

The well-conditioned asymptotic waveform evaluation is applied to the MoM solution of scattering from microstrip structures so that the reduced order model is obtained to efficiently evaluate the frequency response over a broadband in this paper.

为了克服传统MoM逐点计算宽频带特性的缺点，本文将WCAWE技术推广应用到微带问题特别是微带散射问题的分析中，克服了传统AWE技术存在数值不稳定性的缺点。

The courses in this academic program are political theory, foreign languages, applied computational technology, experimental biology, microbiology, molecular biology, genetic engineering, bioseparation engineering, bioreaction engineering, chemical thermodynamics, mass transfer, chemical process simulation, pharmacology, preparation of finished traditional Chinese medicines, pharmaceutical chemistry, GMP in pharmaceutical industry, liquid-to-liquid extraction, pharmaceutical properties measurement and quality control, pharmacy administration, etc.

研修的主要课程有：政治理论课、外语课、数值分析、计算机应用技术、现代生物学与技术实验、现代微生物学、分子生物学、基因工程、生物分离工程、生物反应工程、化工热力学、化工传递过程原理、化工过程模拟、药理学新进展、中成药的制备、药物化学的进展、制药工业的 GMP、液液萃取基础、药品性能检测与质量控制、药业管理学等。

The technique of CAE about injection molding is based on polymer processing rheology and conductive calorifics. It simulates the actual process of melt filling, packing and cooling by setting up mathematic and physical models about melt flowing and heat transmitting in the mold cavity, and working out the results by the theory of numerical value analysis. It can also list the processing parameters quantificationally such as pressure, time, temperature, speed, etc, and reflect the results visually by computer figures.

注塑模CAE技术是根据塑料加工流变学和传热学的基本理论，建立塑料熔体在模具型腔中的流动、传热的数学物理模型，利用数值分析理论构造其求解方法，模拟出实际成型中熔体的动态填充、保压、冷却过程，定量地给出成型过程的状态参数(压力、时间、温度、速度等)，并利用计算机图形学的技术，可形象而直观地反映出分析的结果。

By utilizing the theory of numerical processing, digital frequency spectrum analysis and multi-rate digital signal processing, this paper focuses the research on mechanism of the testing error, the compensation of testing error in the field of sampling technology, nonsynchronous sampling, nonuniformly sampling, and puts forward some new analyzing, compensation and realization methods.

本论文通过运用数值处理、数字频谱分析和多抽样率信号处理的有关理论和原理，对采样技术、采样的非同步方式和采样的多通道方式中的测试原理、测试误差产生机理、测试误差补偿及其应用技术等主要环节进行了深入的研究，提出了一些新的分析与处理方法，建立了有关测试误差分析与补偿的预估理论和实现方法。

The reconstruction problem is ill-posed, so two optimal criterions, the least module and the smoothness criterion base on Tikhonov regularization technique, are introduced into reconstruction algorithm. Many regularization parameters choice strategies are investigated, and the TPA(Two—Parameter Algorithm) strategy which is based on the Morozov discrepancy principles, is implemented in two regularization reconstruction algorithms.Numerical experiment results show that the nonnegative and smoothness constraint condition can overcome the difficulty of iteration semiconvergent, preconditioned technique can improve convergence rate and reconstruction accuracy, smoothness regularization criterion can meliorate ill-posed problem of reconstruction and enhance iteration stability, and the TPA is an effective strategy of regularization parameters choice.

数值试验表明：在共轭梯度法中引入非负约束和光滑约束改善了迭代的&半收敛&性，非负约束保证了解的非负性，光滑约束抑制了重建解的振荡现象，约束算法的重建精度与无约束算法相比大幅度提高；在约束共轭梯度重建算法中引入预优技术，可以加快算法的收敛速度，提高迭代的稳定性和重建精度；引入光滑准则的正则化技术可以有效改善图像重建问题的不适定性，加快迭代的收敛速度，提高迭代的稳定性和图像重建质量，计算正则参数的TPA算法在闪光照相图像重建中是有效的。

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。