查询词典 engineering

Bachelor of science or advanced degree in Engineering.

学士或更高的学位。

From the aeolotropy of hard rock of tunnel engineering region, the stress distribution of several kinds of fault to the water gushing of tunnel, the type of geology disaster involved in macrocharacter, main control factors, disaster mechanism and control strategy in tunnel excavating are studied systematically in this thesis. The purpose is to establish a theory and technology method for forecast and decrease disaster in tunnel excavating.

本文以硬岩隧道开挖工程区域岩体的各向异性研究为起点，从不同类型断层为主要构造形迹的应力分布特征出发，并结合隧道地下涌水灾害，系统研究隧道开挖的地质灾害类型，以宏观表象、主控因素、灾害机制及防治对策为主要研究内容，全面深入研究旨在为隧道开挖期间防灾、减灾提供理论基础与技术路线。

The main factors affecting the soil-structure interface behaviors were found experimentally and theoretically, including: 1 the thickness of the interface that is five to six times the average grain size of the soil; 2 the aeolotropy of interface, which is responsible for anisotropic response of the stress-strain response of the interface; 3 two physical states, including crashing and compression of the soil near the structure surface, which govern the stress-strain response of the interface strongly; 4 two shear deformation components due to sliding and constraint of the structure surface relative to the soil respectively, which forms the deformation of the interface; 5 the volumetric strain due to dilatancy, which is found to be composed of a reversible dilatancy component and an irreversible dilatancy component. 4. A unified constitutive model of the interface, based on new elasto-plasticity damage theory, was developed. It was confirmed to be effective for the conditions considering monotonic and cyclic shearing, coupling effect of shear and volumetric strains, evolution of physical state, micro-structure aeolotropy of the soil and the resulting aeolotropy of the interface as well as the three normal boundary conditions stated above. 5. 2D and 3D finite element formulations of the present model were derived and incorporated into the FEM codes. They were applied to the evaluation of practical engineering problems with different typical interfaces between soil and structure. The new model was shown to be reasonable and effective.

确定了粗粒土与结构接触面厚度约为5～6倍的平均粒径，首次揭示了接触面的细观结构异向性以及由此所引起的宏观剪切异向性，发现了在单调和往返剪切荷载作用下土颗粒破碎和剪切压密两种物态变化机制共同支配着接触面力学性质的变化，通过细观分析证实了接触面的变形可分解为一般同时发生的土与结构交界面上的滑移变形以及结构面位移约束范围之内土体本身的剪切变形两部分，观测到接触面受剪时表现出明显的相对法向位移，并可分解为可逆性和不可逆性两个分量；(4)建立了第一个能够统一地描述单调与往返剪切特性、剪应变与体应变耦合特性、细观结构和宏观剪切异向性以及土颗粒破碎等物态变化特性的土与结构接触面弹塑性损伤本构数学模型，并采用多种法向边界条件复杂加载路径的试验成果验证了新模型的合理性和有效性；(5)提出了新模型的二、三维有限元格式并结合实际边值问题进行了应用计算分析，比较了不同接触面本构模型对计算结果的影响，证实了新模型及其有限元格式不仅能够合理地描述土与结构接触面的主要力学特性，还能够较好地反映土体与结构物在接触面处的滑移、脱开等不连续现象。

Geological condition is the important factors in study on tunnel excavating disaster inevitably. From the aeolotropy of hard rock of tunnel engineering region, the stress distribution of several kinds of fault to the water gushing of tunnel, the type of geology disaster involved in macrocharacter, main control factors, disaster mechanism and control strategy in tunnel excavating are studied systematically in this thesis.

中文题名隧道开挖地质灾害规律与防治对策研究副题名外文题名 Study on tunnel excavating geology disaster regular and control trategy 论文作者杜炜平导师古德生院士学科专业岩土工程研究领域\研究方向学位级别博士学位授予单位中南大学学位授予日期2001 论文页码总数108页关键词隧道工程地质灾害岩爆馆藏号BSLW /2003 /U45 /1 隧道开挖灾害研究必然以地质因素为其主要研究对象。

In virtue of the image analysis techniques and combined with the aerated water flows questions in hydraulic engineering, the corresponding questions in digital image measurement techniques for gas-liquid two-phase flow are studied.

本文运用数字图像处理与分析技术，结合水利工程中的掺气水流问题，研究水气两相流的数字图像测量技术中的相关问题，主要结论和成果如下：(1)研制了一套用于水气两相流动研究的测量与分析系统。

Included to regard aerodynamicist as principle, plus radio communication, electrical engineering...etc. in the world most the forerunner's technique.

包含了以空气动力学为主，加上无线电通讯、电气工程等世界上最先进的技术。

An aeronautical engineering graduate from Imperial College in London, Tombazis began working with the Benetton team in 1992 and by 1994 had been appointed chief aerodynamicist.

毕业于伦郭帝国理工学院航空工程专业，Tombazis于1992年开始在贝纳通车队工作，1994年被任命为空气动力学部门总管。

All of the F1 call to be the Championship (Chinese:a class equation race car a world championship)of the FIAFormula World",.F1 and World Cup Soccer, Olympic sports games because of influence scope wide, popularity Gao, and be called "world three big sport, F1's race car is the most expensive in the world, speed most quick, science and technology content the tallest sport, included to regard aerodynamicist as principle, plus radio communication, electrical engineering...etc. in the world most the forerunner's technique is a lot of new science and technology can at the beginning practice on the F1.The F is a FORMULA abbreviation, namely equation;1 explanations include a lot, can comprehend for the top car hand, top-class game, cash award etc..

F1的全称是FIAFormula World Championship"(中文：一级方程式赛车世界锦标赛)，。F1 与世界杯足球赛，奥林匹克运动会因为影响范围广，知名度高，并称为"世界三大运动，F1赛车是世界上最昂贵、速度最快、科技含量最高的运动，包含了以空气动力学为主，加上无线电通讯、电气工程等世界上最先进的技术很多新的科技都是在F1上得以最初的实践的。F是FORMULA的缩写，即方程式；1的解释有很多，可以理解为顶尖车手，顶级赛事，奖金等等。

School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

北京航空航天大学航空科学与工程学院，北京100083

School of Mechanical Engineering and Automation, Beijing University of Aeronautic and Astronautic, Beijing 100083

北京航空航天大学机械工程与自动化学院，北京 100083

Objective:To compare the response control and attention of Schizophrenic patients with that of the healthy controls by Integrated Visual and Auditorycontinuous performance test. To quantitate the impairment of cognitive function in patients, and to explore the relationship between cognitive function and the severity of the disorder.

目的：探讨精神分裂症病人在IVA持续操作测试中的反应控制能力、注意力等，并与健康人进行比较，从而量化精神分裂症病人的认知功能损害，并进一步探讨其认知功能与疾病严重程度的关系。

Main effective factors including subcooling degree, mechanical vibration, gas hydrate reformation, environment temperature, noncondensing gas and surfactant are analyzed.

指出过冷度、机械振动、重复生成水合物、环境温度、不凝性气体、添加剂是影响气体水合物生成的主要因素，还对R152a水合物的放冷进行了实验研究。