研究与开发
- 与 研究与开发 相关的网络例句 [注:此内容来源于网络,仅供参考]
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The basic approach of protecting people from being hurt or killed in an accident is to improve crashworthiness of vehicles. This paper starts with discussing theories and methods for vehicle passive safety design, which included experiential methods, analytic methods, multi-body dynamics methods, crash test methods and the finite element method. Emphasis will be paid to the basic FEM theories and algorithms of impact problems. Topics discussed include the governing equation, element discretization, hourglass control, time integration, material model, shell element algorithms and contact-impact algorithms. For more reliable simulation results, this paper then conducts study on how to accurately get material model parameters by combining the FEM method with experimental method, and develops relevant material test machine and parameter calculating software. Based on that, basic typical impact simulation and test validation study are conducted. On the basis of the above work, the paper studies the thin-shell structures'crashworthiness, which was affected by the following factors: spot-weld features, shell thickness, cross-section and pre-deformation. As to vehicle parts'crashworthiness, the paper conducts simulation study of designing energy-absorbing steering system and adaptive airbag system. A practical energy-absorbing steering wheel is designed as an example. In further depth research, the paper suggests several inverse quantificational methods for vehicle crashworthiness design based on the ideal crash characteristics. The above theories and methods are applied with good results through several practical vehicles' crashworthiness design and improvement.
文中对汽车碰撞安全性的设计理论和方法进行了归类和总结,其中包括经验法、解析法、多刚体动力学法、试验法以及有限元方法等;重点介绍了碰撞有限元法的基本理论和有关算法,涉及到有限元求解控制方程、单元离散、沙漏模态控制、时间积分、材料模型和应力修正、薄壳单元算法以及接触碰撞界面算法等,探讨了有限元计算中的材料模型参数获取技术,开发了相应的材料试验装置及材料模型参数反求软件,在此基础上进行了基本的碰撞仿真算例和试验对比研究;文中通过应用有限元方法研究了薄壁构件的碰撞吸能特性,指出了设计薄壁吸能构件时需要考虑的几个主要影响因素,即焊点、壁厚、横截面和预变形等;在关于车辆部件的碰撞安全性能设计中进行了吸能转向机构和自适应安全气囊的仿真研究,提出了吸能转向机构和自适应安全气囊的仿真研究方法;文中最后探讨了整车碰撞性能的设计与改进方法,提出了以理想碰撞特性为目标,采用分段加速度或者根据碰撞时间进行设计的反推设计法、部件吸能仿真优化设计法等量化设计方法,并通过综合应用文中所讨论的相关技术进行了整车碰撞性能的设计与改进实例研究,所选定的车型是大众化的普通轿车和碰撞安全性基础较差的微型面包车,研究结果表明,本文所提出的设计与改进方法是适用而有效的,具有重要的工程实用意义和价值。
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The professional content management system, including the papers submitted papers to amend, review papers and user management In the development process, the attention to bring it into conformity with the operation of business processes and systems to the comprehensive, universal, making the system not only applies to an educational institution In the development of methods of choice and chose a life cycle with the prototype of the method of combining law, follow the system research, systems analysis, system design and implementation of four major stages of system design, and in the specific design, to take the evolution of Prototype, with the use and users of the system have deepened the understanding of a certain part or parts of re-analysis, design, implementation In the development of the choice of language, using mainly carried out ASP programming language development, the use of SQL databases, so as to ensure data integrity and consistency This results mainly from system analysis, system design, systems implementation and use of several areas are introduced
本系统管理内容专业,包括论文提交、论文修改、论文审核以及用户管理等等。在开发过程中,注意使其符合操作的业务流程,并力求系统的全面性、通用性,使得本系统不只适用于一家教育机构。在开发方法的选择上,选择了生命周期法与原型法相结合的方法,遵循系统调查研究、系统分析、系统设计和系统实施四个主要阶段进行设计,而在具体的设计上,采取了演化式原型法,随着用户的使用及对系统了解的不断加深,对某一部分或几部分进行重新分析、设计、实施。在开发语言的选择上,主要利用ASP 编程语言进行开发,使用SQL数据库,从而保证了数据的完整性与一致性。
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It holds that the medicine of national minorities is a potential treasury in the development of new drugs and ethno pharmacology is of great scientific value and significance in the research and development of new drugs ,and proposes that the research of new drugs in the medicine of national mino...
建议借鉴国外在非洲ICBG等新药开发与生物多样性保护项目的经验,加大民族药物学方面的科学研究经费投入,积极探索更合理的研究思路和方法,进一步促进民族药物学、新药开发与民族医药可持续发展。
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Although a great deal work have been done to theoretical research of beams with two cantilevers structure, we paid attention to test systems used in beams with two cantilevers mechanics test less. And school, incorporated teaching and researching, needed this small or medium octavo test system to develop teaching and researching. So joining in this development item of test system established by school, the thesis aimed to develop a set of simple, economical and applicable test system of reinforced concrete beams with two cantilevers to serve for teaching and researching, and make it a powerful supplement in structural experiment field.
我们尽管已经对双悬臂结构的理论研究做了大量的工作,但是对双悬臂结构进行力学试验的试验体系相对较少,而作为教学与研究为一体的学校迫切需要这样的中小型试验测试体系开展教学与科研,故本课题结合学校已经立项的试验系统开发项目力图研制开发一套简单、经济、适用的钢筋混凝土双悬臂梁试验系统为教学与科研服务,同时作为对双悬臂梁结构试验领域的补充。
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This text mainly research the thinking of embedded software development and the difference between it and desktop software development; has designed every function module of the system in detail; has given the method of developing GIS in eVC++ 3.0 platform, further investigated the arithmetic of the mouse choosing simple polygon and the arithmetic of polygonal algorithm of area by calculating constant points; has compared ODBC, DAO and ADO three data access technology and realized ADO data access; has analysed the precision of GPS and given some methods to improve it.
本文主要研究了嵌入式软件开发的思路及其与台式机软件开发的区别;详细设计了系统的各功能模块;给出了在 eVC++ 3.0 平台中开发地理信息系统的方法,并深入研究了鼠标选取简单多边形和连续点法计算多边形面积的算法;比较了 ODBC、DAO 及 ADO三种数据访问技术的优缺点并给出了 ADO 数据访问技术的实现;分析了 GPS 定位精度并给出了改进方法。
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Henan modern electronic machinery is based on the Henan Institute of Science and Technology Committee of Henan Branch of the word [1999] on the 1st of the cultural spirit of the establishment of a scientific research institutions, the registered capital of 5.1 million yuan, the Chinese Society of optoelectronic and electronic LED display quality sentinel Detection units, with the Ministry of Information Industry national computer information system integration four qualifications, Henan Province Public Security Department security technology to prevent three qualities, scientific and technological projects in Henan Province units, mainly engaged in LED displays and LED Miner'slamp, and other related products, computer software development And network engineering, anti-theft alarm and video surveillance networks, and other electronic machinery and new materials, new technologies, new product development, development of new materials, new technologies, new product development, development and application.
河南省现代机械电子研究所是依据河南省科学技术委员会豫科条字[1999]01号文化精神设立的一家科学研究机构,注册资金510万元,中国光电学会会员及LED电子显示屏定点质量检测单位,具备国家信息产业部计算机信息系统集成四级资质,河南省公安厅安全技术防范三级资质,河南省科技攻关项目承办单位,主要从事LED显示屏与LED矿灯等相关产品、计算机软件开发与网络工程、防盗报警网络与视频监控,以及其它机械电子类新材料、新技术、新产品的研制、开发类新材料、新技术、新产品的研制、开发与推广应用。
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Under the curriculum basic theory direction and the referring of a great deal literatures, this research circumfusing the subject of curriculum resource's exploring and using discuss the Inner Mongolian Autonomous Region Mongolian kindergarten curriculum resource's exploring and using from sides of theoretic and practice with the appropriate handling of various scientific research method .
本研究在课程基本理论指导下,广泛查阅大量文献资料,恰当的运用科学研究方法,围绕课程资源开发与利用这一主题,对内蒙古自治区蒙古族幼儿园课程资源开发与利用进行了理论与实践方面的初步探讨。
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It constructs a tentative frame of theories and policies of industrial clusters. It analyzes industrial clusters mechanism and policies. The research outspreads nine parts. The first part states the background, thepurpose and the present situation of the industrial clusters and development zone.Chapter2 summarizes the theory of development zone, which includes itsconnotation, forms and the process of development zone, and then analyzes thetheory and practices of development zone abroad, finding the gap between Chinaand other developed countries and regions. In chapter 3, based on study of presentresearch, this paper discusses competitive advantages and inherent mechanism, putsforward to the necessity of research of industry cluster in hi-tech zones and pointsout that the industry cluster is the key that Hi-tech zones carry out the seconddevelopment In Chapter4, this paper discusses the possibility and their mutualmotivation between industry cluster and development zone from the view ofIndustrial Ecologization, game theory and industrial structure theory; based onanalysis of Chapter3 and Chapter4,the next two chapters underlines thedevelopment mood and mechanism of industrial cluster in developmentzone,besides,these chapters points out the role of government in this mood. InChapter7, this paper discusses the system of evaluation of the performance ofdevelopment zones. At last, based on the analysis above and the present situation ofOptical Valley in Wuhan, Hubei province, the author estimates the performance ofoptical industrial clusters in Optical Valley, and puts forward to the advices about thegovernment, the mood and the policies of optical industrial clusters in OpticalValley.
全文研究从以下八个部分展开:首先,在文章的第一部分,论述了关于本篇论文的研究背景、研究目的和国内外研究的理论与实践现状;第二部分主要阐述了关于开发区的理论,包括其内涵、表现形式和发展历程,并对国外开发区的理论和实践予以论述,由此对比出国内外开发区发展的差距,从中找出国内高新科技园区的不足和先进发展模式的经验——即发展产业集群;第三章产业集群的基本理论,在对现有理论成果作了梳理工作之后,着重分析其竞争优势和内在机理,为开发区发展模式中引入此概念的必要性埋下伏笔;在探讨了开发区内大力发展产业集群的必要性以后,第四部分着重研究其可行性及其互动机制,包括从产业生态学的角度、博弈论的角度、产业组织理论的角度等,为开发区内的产业集群发展的优势进一步展开;在完成了对其必要性和可行性探讨的基础上,在本文的第五和第六部分分别研究了我国开发区产业集群的发展模式和运行机制,以及政府在当中应当扮演的角色,并提出适当的制度建议;第七章给出了开发区产业集群的评价体系,并在此基础上,第八章结合武汉光谷高新技术开发区的现状作出实证分析,对区内产业集群发展情况作出评价,并对其具体发展模式、政府行为及政策建议作出建议。
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Two new methods about preparation of nano-inorganic coated polymer microsphere have been found. The research mainly focused on controlled precipitation of inorganic precurdors onto the polymer microspheres, technique of preparation and size distribution of transition metal oxides and sulfides emulsion particles, nano-paticles''surface modification and the HLB values adjustment, emulsification of oil-soluble monomer in inorganic colloid and emulsion stability, emulsion polymerization that inorganic particles act as medi-phase, the preparation of inorganic nano-particle/polymer hybrid microspheres, preparation of hybrid materials in inverse emulsion, inverse emulsion polymerization of acrylamide and its phase behavior. Inorganic nano-particles we studied concerning TiO2、SiO2、Fe3O4、ZnO、ZnS、Ag and black carbon. Also we studied the morphology and capability of the hybrid materials.
主要内容有:无机物在高分子乳胶模板体系的界面定位沉积研究;过渡金属氧化物、硫化物纳米胶体粒子的制备工艺与胶粒尺寸分布研究;纳米粒子的表面修饰及其亲水亲油平衡值的调制;油溶性单体在无机胶体中的乳化行为与乳液稳定性研究;以无机纳米粒子做中介相的乳液聚合与无机纳米粒子/高分子复合微球制备研究;反相体系中杂化材料的制备;丙烯酰胺水溶液反相乳液聚合、相行为与稳定性;丙烯酰胺反相体系中无机粒子的制备研究;涉及到TiO2、SiO2、Fe3O4、ZnO、ZnS、Ag、碳黑等纳米无机物,系统考察了相关材料的形态与性能,为其应用开发奠定了基础。
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Based on the analysis of the embedded system and embedded software development process and memory management, we researched the unitary requirement and particular requirement for memory management module of embedded software development platform. Then the infrastructure of communication industry oriented embedded software development platform had been described, and the design ideas of memory management module of embedded software development platform had been put up: kernel data section management, process stack and data section management , UB section management , high mapping address management and specific implementing code to realize the application, release, protection, leak detection, system information providing of memory.
本文在分析了嵌入式系统及嵌入式软件开发过程及其内存管理的特点的基础上,研究嵌入式软件开发平台的整体需求和对内存管理模块的具体需求;描述了面向通信行业的嵌入式软件开发平台的整体结构,具体提出了嵌入式软件开发平台内存管理模块的设计思想:核心数据区管理+进程堆栈与数据区管理+UB区管理+高端映射地址的管理,和具体实现代码来实现内存申请与释放、内存保护、内存泄漏检查、提供系统内存信息等功能。
- 推荐网络例句
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The split between the two groups can hardly be papered over.
这两个团体间的分歧难以掩饰。
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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。
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The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.
聚光:照片上是建在西班牙桑路卡拉马尤城的一座新型PS20塔式太阳能电站。被称为&日光反射装置&的镜子将太阳光反射到主塔,然后用聚集的热量产生蒸汽进而通过涡轮机转化为电力