自然科学研究

Took Chongqing Gong-he tunnel as an engineering example and studied the failure mechanism of surrounding rock and the correlation with bolt support system by using the methods of theoretical analysis, modeling test, numerical simulation and in situ test, some helpful conclusions were arrived as follows.Firstly, a new failure criterion for transversely isotropic rock mass was proposed with consideration of bedding plane orientation and major principal stress, and the corresponding algorithm, arrived through VC++6.0, can be easily embedded into the software FLAC3D for the geotechnical calculation.

论文在国家自然科学基金专项基金创新群体基金项目(No.50621403)以及国家自然科学基金重点项目"隧道与地下空间工程结构物的稳定性与可靠性(No.50334060)"的资助下，以共和隧道为示范工程，运用理论分析、物理模型实验、数值模拟和现场测试等手段，对共和隧道大埋深段层状岩体的围岩变形破坏机理、锚杆支护力学效应及围岩-支护结构的变形特征等内容进行了研究，其主要研究成果有：①在总结和探讨国内外学者提出的层状岩体经验型连续介质破坏准则基础上，结合层状岩体力学特性，考虑层面方向和最大主应力方向两个影响因素，提出了共和隧道层状岩体横观各向同性破坏准则；采用汇编语言VC++6.0实现了横观各向同性弹塑性本构关系的算法，并嵌入FLAC3D有限差分数值分析软件接口中实现数值运算。

The dissertation presents a mathematical modeling approach for the high-speed flexible linkage mechanisms equipped with bonded piezoelectric sensing/actuating elements employing a mixed variational approach with Hamilton's principle in conjunction with the finite element formulation. This model includes both the terms coupling the elastic and rigid-body motions of linkage mechanisms and the terms coupling the elastodynamics and piezoelectricity of the elements, incorporating their effects upon the mass and stiffness matrices which are in general non-symmetric.

本文以国家自然科学基金资助项目《弹性连杆机构有害振动的主、被动控制及混合控制研究》（资助号：59605001）和广东省自然科学基金项目《开链及闭链机构有害振动控制研究》（资助号：970381）为依托，对高速弹性连杆机构振动的主动控制中的建模、求解、控制律的选择、作动/传感元件的优化以及实验研究等几个关键问题进行了比较深入细致的研究，取得了一些具有重要理论意义和重大实际应用价值的成果。

Therefore it is necessary to research the mechanism of greensand used for high compacted molding methods thoroughly.This subject is one section of the National Natural Science Foundation subject ""Ivestigation on Predicting Method and Mechanism of Springback for High Compacted Sand Molds"", followed of the other completed one named ""Research on Microdeformation of Molding Sand"". A serious of experiments has been done on the reequipped three axial machine under certain technological conditions, and the mechanics, material science, rheologic science. It is systematically studied that the influences on the springback of sand mold were caused by the main influence factors: pressure, compacted rate and the content of soil. Through the analyzed experiments' data, the experienced stress-strain relationship concerning the main influence factors were obtained;under different technical parameter, the springback and spingback's potential energy are compared, the differences and indifferences between them are found out, and the springback's mechanism is discussed;according to the tests' data of YangGuoping coming from Tinghua University, experienced formula of molding sand's springback displacement is induced, the displacement and springback are compared, the margin of error's reasons are analyzed, and they are tested and verified mutually.

本课题为国家自然科学基金项目"高紧实度砂型预测方法及回弹机理的探讨"的一部分，是已结题的国家自然科学基金项目"铸造型砂微变形的研究"的后继，运用力学、材料学及流变学理论，利用改装的三轴仪，在一定的工艺条件下，作了大量系列实验，系统的研究了压实比压、紧实率和膨润土含量对砂型回弹的影响；对实验数据进行了分析和处理，得出了型砂关于压实比压、紧实率和膨润土含量的本构关系的经验公式；把各工艺参数下的型砂产生的回弹量与回弹势能进行比较，找出两者存在的异同点，并对回弹机理进行了探讨；通过清华大学杨国平的实验数据，推导出型砂回弹位移场的经验公式，并与实验测出的回弹量进行比较，分析误差造成的原因，并互相进行了验证。

The new method is given to design the optimum profile modification curve design The effects of optimum profile gear in improving the dynamic performance of gear transmission are verified in the Gear Dynamic Performance Test Rig In this dissertation, the main study contents and creative results are shown as following: The influences on the gear transmission system caused by the gear's accumulated error (periodic error and harmonic error) are theoretically studied. A new method is developed to simulate the gear's harmonic error by using the 2-order MARKOV process A simulated model of the dynamic performance which is excited by the gear's accumulated error is obtained.

本文在前人大量研究的基础上，结合作者承担的国家自然科学基金项目"齿轮传动动态系统辨识与三维修形研究"和山东省自然科学基金项目"齿轮传动动态性能仿真及结构参数、齿形的优化修形"，采用理论和试验相结合的新思路，系统地研究了齿轮传动的动态性能，建立了能正确描述齿轮传动系统动态性能的仿真模型和系统辨识模型，给出了确定齿轮传动轮齿修形曲线的优化设计方法，利用自行研制的齿轮传动动态性能试验装置，验证了优化修形齿轮对提高齿轮传动动态性能的突出作用。

He has made systematic high-level research achievements in the study of solar nebular evolution, meteorites, cosmic dust and Apollo lunar rocks, as well as comparative planetology, the climatic and environmental change of, and mass extinction induced by the impact of extraterrestrial bodies on the earth, formation and evolution histories of solar system, two-stage accretion model of earth's origin, original inhomogeneity of the primordial earth and its constraint on metallogeneity and tectonic evolution.

其地下核子试验地质效应综合研究於1978年获全国科学大会奖；吉林陨石综合研究於1986年获中国科学院重大科技成果一等奖和1987年全国自然科学三等奖；《天体化学》专著於1991年获中国科学院自然科学一等奖；月球探测成果更获工业与资讯化部特等奖和国防科工委个人突出贡献奖。欧阳自远院士在国内外已发表专著16部、主编著作14部、论文426篇，培养硕士、博士与博士后65人。

First, we introduce unitary transformation of matrix filter. In terms of this transformation, an algorithm is presented to construct compactly supported orthogonal multiwavelets from the corresponding multiscaling function.

自二十世纪八十年代以来，小波分析一直是各学科普遍关注的热点研究领域，其应用几乎涉及自然科学与工程技术的各个分支，目前小波分析已成为研究和解决自然科学与工程中许多复杂问题的强有力工具。

To resolve the problem effectively, gene transfection technique is used in this experiment to transfer human VEGF into seed cells-mesenchymal stem cells of tissue engineer bone and to make it secrete VEGF which could vascularize bone.

国家自然科学基金资助课题(30471768/ C03030307)&组织工程材料栓塞颅内动脉瘤的实验研究&*；吉林省自然科学基金资助课题(2003053622)&转基因技术构建组织工程化颅骨修复材料的实验研究&

Dr. Luo has obtained many fundings from National Nature Science Foundation of China, Chinese Academy of Sciences, IAEA, and so on.

回国后主持项目：（1）财政部/中科院&百人计划&资助；（2）教育部留学回国人员启动基金；（3）安徽省人才开发资金资助（No： 2006Z024）；（4）国家自然科学基金面上项目（No： 10675130， 2007-2009）；（5）国家自然科学基金海外青年合作项目（合作者，No： 10728510，2008-2010）；（6）国家自然科学基金面上项目（No： 10875148，2009-2011）；（7）国际原子能机构协调研究项目 IAEA-CRP No： 14909， 2008-2010）。

Supported by National Natural Science Foundation of China (No.50077006) and Natural Science Foundation of Hebei Province (No.503424), the setup method of circuit model for instrument transformer and transient electromagnetic interference to the secondary equipments through conductive coupling due to switching operations in Gas Insulated Substation are researched in this paper.

本文结合国家自然科学基金项目&变电站瞬态电磁环境的预测计算方法研究&(项目编号：50077006)和河北省自然科学基金项目&气体绝缘变电站电磁环境与电磁干扰预测计算的研究&(项目编号：503424)，重点研究了气体绝缘变电站互感器高频电路模型的建立方法和开关操作通过传导耦合对二次设备的干扰问题。

However, the voice of Chinese economic geographers in international forums has still remained very weak.

在肯定其积极影响的同时，不能忽视自然科学研究方法对中国经济地理学的发展仍具有重要意义。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。