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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。

In modern physics research, the calculus of variations has a broad application of law. As a solid mechanics, structural mechanics and computational mechanics of the theoretical foundation, it has important value in theory and practice on the mechanics; Variation method ruled out the perturbation of the restrictions can be widely used in many state-level and the state function in the calculation in the optical; Calculus of variations can be calculated with the parameters, we can guarantee the reliability of the results, can effectively reduce the workload of calculation, It can be said that the applications of calculus of variations are very broad.

在现代的物理学研究中,变分法有着广泛的应用:在力学上,变分法作为固体力学、结构力学及计算力学的理论基础,在理论上和实践上都有重要的价值;在光学上,变分法排除了微扰法的限制,可以广泛应用于诸多定态能级和态函数的计算中;在量子力学的应用中,具有可算出系统的参数,既可以保证计算结果的可靠性,又能有效地减少计算的工作量等的优点,可以说变分法的应用领域十分广阔。

The theory and algorithm of 3D graph display and reconstruction is studied, including the synchronous contour matching algorithm, MC method, projection-based method, Delaunay triangulation, shortest diagonal method and maximum volume method. And the method of extraction of the color edge of 3D color data is proposed.

分别以同步轮廓线前进法、MC法、基于投影法、Delaunay三角法、最短对角线法、最大体积法研究三维图形显示、重建的理论和算法,提出三维彩色数据颜色边界提取方法。

The primary studying works and characteristics:1 To summarize reinforcing theory of cement mixing pile composite foundation2 To analyze the primary mechanics characters and changing rules of cement mixing pile, based on analysis of test data both indoor and outdoor.3 To discuss siding frictional resistance, ending resistance, ultimate bearing capacity of simple mixing pile and effectiveness factor of grouped piles, loading ratio of soil between piles under cushion cap of grouped piles and stress ratio of pile and soil and so on, and use many computation method and experimentation method to ensure bearing capacity of mixing piles composite foundation.4 To point out and analyze eight sides flaws and problems of the bearing capacity calculation method of mixing pile compositefoundation which ensured by national and normative method/ formula.5 To apply test results of loading tests and a few settlement observation data, use gray theory to predicate ultimate bearing capacity of deep mixing piles, actual example demonstrate engaging between theoretical predicted value and actual value.6 To apply groovy layerwise summation method to discuss entity piles method, double foundation method, equivalent layerwise summation method and consolidation theoretical method and so on, especially by combination of engineering example, use FEM to calculate or discuss the settlement and changing rules of composite foundation.7 To discuss problems of critical length of composite foundation by combination of engineering example and numerical analysis method, and analyze the contrast of critical length between simple pile load and most area load of composite foundation, not only critical length of composite foundation is relative to modulus ratio between piles and soil, but also upside load distribution area of composite foundation.

主要的研究工作与特色为:(1)总结了水泥搅拌桩复合地基的加固原理;(2)在对室内外试验资料进行统计分析的基础上,系统分析了搅拌桩水泥土的主要力学特性及其变化规律;(3)探讨了搅拌单桩的侧摩阻力、端阻力、极限承载力及群桩效率系数、群桩承台下桩间土荷载分担比及桩土应力比等,提出用多种计算方法并结合试验方法来综合确定搅拌桩复合地基的承载力;(4)明确指出和分析了按国家有关规范的方法确定搅拌桩复合地基承载力所存在的八个方面的缺陷与问题;(5)利用过去没有加载至破坏阶段的载荷试验成果和较少的沉降观测数据,尝试了用灰色理论预测深层搅拌桩的极限承载力,实例表明理论预测值与实测值吻合较好;(6)在常规分层总和法的基础上,探讨了复合地基沉降计算的实体墩基法、双层地基法、等效作用分层总和法、固结理论法等,特别是结合工程实例,用有限元数值计算等方法计算和讨论了搅拌桩复合地基的沉降及其变化规律;(7)结合工程实例,用数值分析方法探讨了复合地基临界桩长的问题,指出和分析了单桩荷载下的临界桩长与复合地基大面积荷载下的临界桩长存在很大的差别,复合地基的临界桩长不仅与桩土模量比有关,而且与复合地基上部荷载分布面积有关。

Firstly, it seeks the sources from which theories have been developed, by a summary of evolution or a road-map. Secondly, it explains the two basic forms taken by traditional theories on intra-industry trade, namely, horizontal intra-industry trade model and vertical intra-industry trade model. Both models take final products as trade objects and products of same industry are thus simultaneously exported and imported among developed nations and among developed nations and developing ones.Thirdly, it points out that the theory of vertical intra-industry trade has already been expanded in scope in the area of trade between developed countries and LDCs. It shows that the implication of vertical intra-industry trade has expanded to the importation and exportation of parts and components, intermediate products or processing products produced via various working procedures or different production links within the same industry, with MNCs as carriers. It gives the summary of the methods of measuring intra-industry trade and argues that the basic method adopted by this thesis is G-L Index. In addition, GHM and Input-output Analysis are introduced to demonstrate the expansion of vertical intra-industry trade.

首先,通过整理国际贸易理论的发展脉络,寻求产业内贸易的理论渊源;其次,阐述产业内贸易传统理论的两种基本形式,水平型产业内贸易与垂直型产业内贸易的理论模型,指出两者都以最终产品为贸易对象,实现了发达国家之间或发达国家与发展中国家之间的同一产业内产品的同时进口和出口;第三,结合全球化的特点和跨国公司在国际要素分工中的基础作用,指出发达国家与发展中国家之间的垂直型产业内贸易理论已经得到拓展,表明垂直型产业内贸易涵义已发展成为以跨国公司为载体的同一产业内不同生产工序或不同生产环节的零部件、中间产品或加工产品的进口和出口;最后,归纳了产业内贸易的计量方法,指出本文的产业内贸易基本计量方法是G-L指数(格鲁贝尔-洛伊德计量法),并在此基础上进一步说明与垂直型产业内贸易的拓展相关的计量方法包括:GHM计量法和Hummels投入-产出分析法。

The first, as regards theory, Vijnaptimatrata regard that all the dharma (including material world and inner world) are created by the eight vijinana of citta-dharma, and the reason that vijinana can create all the dharma, is the bijas be hide in alayavijnana, this bijas can create all the dharma under some condition. And this dharma will vasana vijnaptimartata, enables its seed to be mature, like this continual create dharma, dharma vasana the bija, the bija turns round presently, This is the possible theory condition of transform vijnana into wisdom to be able.

首先就理论方面而言,唯识学认为世间万法(包括物质世界和精神世界),都是由心法八识所变现生起的,而识之所以能够变现世间万法,就在于在阿赖耶识中潜藏有万法的种子,该种子在一定条件会生起变现出世间万法,而生起的万法又熏习阿赖耶识,使其种子得以成熟,如此无间地生起现行,现行复熏习种子,种子复起现行,这是转识成智得以可能的理论条件。

This paper has done a deeply research on the evaluative method, which focus on maintaining and ensuring the camion. After deeply analyzing the maintain theory of army equipment and the stratagem 's characteristic and combining the current systems engineering evaluating theories and methods, it has analyzed and solved all limitations that coming forth when a single model is used to evaluate the maintain capacity. After analyzing and ameliorating the judgment of AHP's coherence, the calculation of the expert power value and the optimizing of the more-extreme judging model, a new calculation method, the multidimensional complex calculation theory, is presented, which much fits for the evaluative calculation of the camion. The new theory's feasibility and the evaluation's reliability have been proved in theory in this paper. This paper also analyses the principle and the program, which is about building a camion evaluating system. According to the multidimensional complex calculation theory, an evaluative model has been built. Applying the levels analytical method, this paper fixes on the calculation of every target's power, brings the optimization allot precept of macro spatial resource, optimizes the resource of the maintainability of theater of operations' vehicle, which offers a theory foundation for optimizing of the resource space. The research not only brings out a uniform standard for the evaluating of the maintain ability of the camion, but also presents a theory foundation and method for perfecting the camion maintain system.

本文对军用车辆维修保障能力评估的方法论进行了深入研究,在理论上通过对军事装备维修理论及战略特性的深入剖析,结合现有系统工程评估理论、评估方法的特点,分析解决了应用单一模型评估装备维修能力问题的各种缺陷,就AHP法判断矩阵一致性判定,群策专家权重值的确认及多元评判模型的优化进行了研究和改进,形成了适应军事车辆维修保障能力评估应用的新算法--多元复合算法理论,对这一创新评价理论的科学性及评估可靠性进行了理论证明和算法应用;研究分析了建立军用汽车维修保障能力评估指标体系的原则和程序,并按照多元复合算法的理论,建立了车辆维修保障能力评估模型;应用层次分析法的原理,明确了各指标权重的算法,提出了宏观空间维修资源优化分配方案,优化了战区车辆装备维修能力资源空间,为某一具体车辆装备维修能力形成所需维修资源空间的优化提供了理论依据;本文的研究既为军用车辆装备维修保障能力评估提供了统一的衡量标准,也为军事装备维修保障系统的进一步完善提供了理论依据及方法手段。

Therefore, it can be regarded as a great improvement of the investment decision-making theory and methods .This article makes a systematic research on real options theory and method and its application, including the following several main aspects:Firstly, it makes a detailed discussion about the common theoretical basis of financial options and real options, including no-arbitrage equilibrium principle, risk-neutral definition, complete market and dynamic tracking.Secondly, it analyze three basic characteristic of investment decision-making in modern market economic system: irreversibility, uncertainty and flexibility, and from the angle of their mutual quantitative and qualitative interactions, it makes a comparison between the traditional NPV methods and real options methods and makes a summary of the general analytical methods of real options.Thirdly, it discusses the all elements in the application of real options such as the ^leakages in value of real assets, basis risk, and private risk, and furthermore, it attempts to put forth a normalized strategy of its application and construct a basic framework of its application.Fourthly, it applies real options theory to strategetic investment of enterprises and the buy-out of company, putting forth a value model for strategetic investment program and making a concrete analysis of its application to buy-out. Furthermore, it advocates that a flexible investment decision-making system should be setup according to real options theory in our country.

本文对实物期权理论和方法及其应用进行了系统研究,主要内容包括如下几个方面:(1)详细讨论了金融期权和实物期权共同的理论基础,主要包括无套利均衡原理、风险中性定义、完全市场以及动态复制方法,对这些理论方法的探讨既是本文的出发点和基础,它们提供了研究实际应用实物期权的一个基准点,也是贯穿全文的线索和灵魂;(2)分析了现代市场经济体系中投资决策的三个基本特征即不可逆性、不确定性和时机选择,并从它们数量上和质量上相互作用的重要意义的角度,分析了传统的净现值法与实物期权方法的差异,指出了净现值法在不确定环境中存在的缺陷及实物期权处理投资灵活性的价值,并将净现值法纳入实物期权投资分析决策体系当中,总结了企业投资决策实物期权的一般分析方法;(3)探讨了实物期权应用中要考虑的各种要素,如实物资产的价值漏损、基差风险和非市场风险等,并进一步提出了实物期权应用的规范化策略和构建了一个实际应用实物期权方法的基本框架,尝试将期权的基本原理与企业在现实经济环境中投资决策的要素结合起来,从而可以在一定程度上超越期权的复杂的数学计算而汲取期权思想的精华,从而促进期权决策方法在实际投资决策中的应用;(4)将实物期权方法应用于企业战略投资,得出了战略投资项目的价值模型,指出可以将实物期权理论和方法应用于企业并购,分析了应用的具体方面,并提出应根据实物期权理论建立一套适合我国企业的灵活的投资决策系统。

The theory can also be used in the computation of thin, medium-thick and thick plate in elastic foundation.

建立了Winkler地基及双参数地基上Mindlin中厚板的无网格法分析理论,将EFGM法、RKPM法、NEM法这三种无网格法应用于Mindlin中厚板弯曲问题,推动了弹性地基上中厚板计算理论的发展。

The seismic disasters features and behavior mechanisms of the buriedwater supply pipeline are analyzed by synthesis and the breakage of thepipe joints caused by seismic wave propagation as main disasters mode isled into. The soil-pipe interaction, and the soil-pipe slippage arediscussed. Statistical experience method resulted from earthquakeinvestigations and theoretical methods based on reliability theory areintroduced. The reliability of buried pipeline is researched. The methodfor estimate connective reliability of network by means of Monte Carlesimulation technique and Breadth First Search method is introduced. Theconnective reliability of water supply pipe network is researched.

本文综合分析了地下供水管道的地震破坏特征和反应机理,引入了以接头破坏作为主要的破坏模式,并探讨了管土间的相互作用和滑移作用等问题;介绍了根据震害调查数据回归的统计经验法和基于可靠性理论的理论分析法,对地下管道的可靠性进行了研究;介绍了利用蒙特卡罗法和网络图论中的广度优先搜索法判定网络连通可靠度的方法,对供水管网的连通可靠性进行了研究;考虑到震害预测方法中的许多参数是随时间变化的,应用灰色理论和概率论,建立了基于GIS 的供水管网动态震害预测模型。

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推荐网络例句

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在,'歼灭战perfuming自己与胡努特,那麼,他来到和SAT 。

The shamrock is the symbol of Ireland and of St.

三叶草是爱尔兰和圣特里克节的标志同时它的寓意是带来幸运。3片心形叶子围绕着一根断茎,深绿色。