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By fitting of experimental data of concrete beams with 2-D composite cracks based on the fictitious crack model, mathematical expressions for parameters α and β in the 2-D composite inteneration equations for Ⅰ-Ⅱ,Ⅰ-Ⅲ, and Ⅱ-Ⅲ composite cracks are obtained, and based on the expressions, 2-D composite inteneration curves under different proportions of two stress intensity factors, that is under different weights, at the ends of 2-D composite cracks can be directly derived.

作者中文名：邵勇；王向东摘要：基于虚拟裂缝模型，通过对混凝土二维复合型裂缝梁试验数据的拟合，得到了ⅠⅡ，ⅠⅢ，ⅡⅢ3种二维复合型软化方程中参数α，β的数学表达式。据此表达式可直接求得二维复合型缝端2个应力强度因子之任意比值下混凝土二维复合型的软化曲线。

Through the study of cost-contrasting analysis, it indicates that the cost of web-based education has obvious advantage comparing with traditional education of TsinghuaUniversity and internal traditional education. In contrast with the cost construction and economic features of the first and second generation distance education, the web-based education of Tsinghua University shows the economic features of capital/technology intensiveness ,not the feature of labour intensiveness which traditional face-to-face education has demonstrated.

在成本的比较研究中表明，清华大学网络教育相对于清华大学传统教育以及国内传统高等教育具有明显的成本优势；在同第一、二代传统远程教育的成本结构和经济学特征的比较中发现，清华大学网络教育仍显现出资金密集型的经济学特征，而不是劳动密集型即向传统面授教育回归的经济学特征。

Based on the fact that the dye probe can intercalate DNA duplex to emit fluorescence, a novel method for detection of DNA polymerase has been developed. The polymerization process has been indicated by fluorescent signal in real-time. Based on this assay, the influence of anti-tumour drugs on the activity of polymerase has been investigated.

利用染料探针技术，建立了一种简便快捷地实时监测聚合酶活性的方法，探讨了三种抗肿瘤药物对聚合酶活性的影响，为以聚合酶为作用靶标的抗肿瘤新药的开发及筛选提供了一种新的思路。

The multifunctional interface circuit based on 1394 is a new application for ieee 1394. it is a hot spot to research and design the multifunctional interface circuit based on 1394, can realize the interconversion between different interfaces, and make the rapid transmission of data easier.

基于ieee 1394的多功能接口电路是ieee 1394技术的新应用，研究和设计基于ieee 1394的多功能接口电路可以实现不同接口之间的相互转换，方便数据的快速传输。

Combining the experimental results and theoretical analysis, the following work has been accomplished.(1) Reasons of the decrease of interelectrode capacitance and the increase of discharge gap caused by the powder suspended in dielectric fluid are explained. And the mechanism that surface quality of workpiece improved by powder-mixed EDM is analyzed from this viewpoint.(2) The variation regularity of the percentage of silicon on the machined surface of workpiece has been summarized according to the experiment results when silicon powder was added into the working fluid. The entropy is introduced to explain the reasons for this variation regularity by thermodynamics.(3) The dimensional accuracy is greatly influenced by the overcut resulting from discharge gap and electrode wear in practice application. Empirical formulas for the overcut in EDM and powder-mixed EDM are established based on the experimental results using the ternary linear regressive method in this paper.(4) The influence of main factors on the machined surface characteristics has been evaluated based on the orthogonal experimental design method.

通过一系列普通电火花加工与混粉电火花加工的对比实验，运用工艺实验和理论分析相结合的方法，重点做了以下工作：(1)探讨了粉末颗粒导致极间电容减小、放电间隙增大的原因，并从这个角度解释了混粉电火花加工可以改善工件表面质量的机理；(2)以混合硅粉的电火花加工为例，实验得出峰值电流和脉冲宽度对加工表面层成分中硅元素含量的影响规律，并引入熵的概念从热力学的角度对硅元素含量变化的原因寻找了理论依据；(3)在实际加工中，由于粉末的加入使放电间隙变大，这使得混粉电火花加工的尺寸精度难以控制，本文利用三元线性回归的方法，在实验数据的基础上，建立了两种电火花加工过切量的计算公式；(4)将正交试验法应用于混粉电火花加工实验研究，并通过对实验指标极差的直观分析，得出各电参数对加工指标影响的敏感程度。

This succession was based primarily/on deposits and events (not directly related to glacial and interglacial periods)/, rather than being based/on the more usual modern method .

这一序列主要是基/于（与冰川期和间冰期并不直接相关的）沉积物和事件做出的，而不是基/于更为通常使用的现代方法/，。

Company is based on interior decoration design and construction-based professional firms.

公司是以室内装饰设计和施工为基础的专业公司。

The CRT based television was based on an interlaced scan system from the beginning of TV.

以影像管为基础的电视以来自电视的开始的一个被使交织的扫描制度为基础。

In order to reduce the computation of fractal-based interpolation, an interpolation method based on fractal templates is introduced.

其次，为减少基于FBM模型的图象插值的计算量提出了一种基于模板的图象插值方法。

Based on MLS and direct collocation,themeshless methods for function interpolation and solving elastic-static problem areestablished.Combining the advantages of direct collocation method and Galerkinmethod,the method based on least-square collocation is also proposed.

基于MLS近似和直接配点格式，本文建立了函数插值、弹性静力问题求解的无网格方法；结合Galerkin方法和直接配点法的优点，提出了最小二乘配点型的无网格方法。

I was up all night because I was in pain, she said.

我整夜，因为我在疼痛，她说。

A crow caws /craoks.

乌鸦叫。 51-论文网