Depending on the reinforcement of steel bridge over Yellow River in Wubu and according to the characteristics of steel structure in highway bridge and industrial and civil buildings, this article initially establishes finite element analysis model of high cycle fatigue damage for steel structure by using fatigue damage theory and finite element analysis.
本文以吴堡黄河钢桁架桥的加固工程为依托，针对公路桥梁和工业与民用建筑钢结构的特点，并结合疲劳损伤理论与有限元分析方法，初步建立了钢结构的高周疲劳损伤有限元分析模型。
For if one may forge a theory of the cycle with little or no relation to general economics, then general economics must be incorrect, failing as it does to account for such a vital economic phenomenon.
然而如果有人能建立起一套多少与一般经济学有些关系的循环理论来，那么一般经济学必将陷入谬误，因为它在如此重要的经济现象面前大失水准。
Establish the theory framework and the system model of the environmental management system for mechatronic product life cycle.
构造了面向产品全生命周期的环境管理理论框架及系统模型。
The Chinese theory of historical circulation was originated from observation and self-reflection of natural phenomenon in cycle.
中国历史循环论起源于中国人对周而复始的自然现象的观察和反思。
Furthermore, it is given a new guidance of theory for the design of the real thermodynamic cycle.
对实际热力循环的设计提出了一个新的理论指导。
Before macroeconomics was established, people had found and research on business cycle theory for about 70 years.
事实上，经济周期Business Cycles最早是经济组织从事生产经营活动的营业周期，主要指经济个体生意上的周期。
On the basis of this, this article founded the system of signal control theory at Cross Roundabout. This theory system includes the roundabout capacity model, cycle length model, changed interval model, phase model and the range of applicability of this theory.
并在此基础上建立十字环形交叉口信号控制的理论体系，并建立和完善了十字环形交叉口环岛容量的模型、十字环形交叉口信号周期的模型、信号控制相位的确定方法、绿灯间隔时间的模型以及十字环形交叉口信号控制理论的适用范围。
In this paper, the theory and methods of life cycle assessment and management are provided in detail.
详细介绍了生命周期评价和管理的理论与方法。
However, the linkage between real business cycle theory and the early theory is atmost indirect, what this chapter deal with is some immediate causes.
与真实经济周期理论有直接联系的则是卢卡斯批评、均衡的货币周期理论、区分刺激机制与传播机制的传统、对趋势与随机游动探讨等。
Study of business cycles must be based upon a satisfactory cycle theory.
对商业循环的研究必须以某种理想的循环论为基础。
Referenced on the knowledge of ecology, environment, ethics, architecture, management, based on the counter-effect among tourism resources, tourism market and tourism products, the life-cycle theory of tourism destinations and the locational theory of tourism, this paper studies the exploit and management of eco-tourism in protect areas of China.
本文借鉴生态学、环境学、伦理学、建筑学、管理学等学科知识，运用旅游资源——市场——产品互动理论、旅游地生命周期理论、旅游区位理论、生态设计理论和有效管理理论等，研究了我国自然保护区生态旅游的开发与管理。
The connotations and types of bushiness incubator and distinguishes from sci-tech park were introduced. The origin, function, operational mechanism, developmental modes and other literatures were reviewed. The basic theories of business incubator were also reviewed, that is, specialization and division theory, transaction cost theory, entrepreneurship theory, industry agglomeration theory and enterprice life cycle theory.
介绍企业孵化器的内涵与类型，企业孵化器与科技园区的区别；对国内外企业孵化器的起源、作用、运行机制、发展模式及相关研究进行综述；综述了企业孵化器运行与发展的基础理论，即专业化与分工理论、交易费用理论、创业理论、产业集聚理论和企业生命周期理论。
In the research process, based on a greatdeal of drill core, drilling/ logging datum and seismic data, geologic analysis and onanalyzing the history of the tectono-sedimentary evolution in NanPu sag, combiningwith the technology of physics interpretation and the fundamental theory ofSequences Stratigraphy、sedimentology and structural geology with analysis technique, The author establish the framework of equitime coenocorrelation of the Dongyingformation and compartmentalize the Dongying formation as a second order sequence(long-term base level cycle), and fourth order sequence.
本文从南堡凹陷整体出发，研究过程中以大量岩心、钻/测井、地震资料为基础，地质分析与地球物理解释技术相结合，层序地层学、沉积学与构造地质学基本理论与分析方法相结合，在分析南堡凹陷构造-沉积演化史的基础上，建立了南堡凹陷东营组等时地层对比格架，将东营组地层划分为一个二级层序、四个三级层序，其中东一段跨越两个三级层序。
The paper analyses influencing factors of expressway network maintenance station layout and site selection, using combination optimization theory, constructs CFLP layout model of expressway network maintenance station based on time series and life cycle cost, which overcomes the weakness that traditional CFLP method determines the expressway network maintenance station layout only depended on experience without considering the operation cost.
论文分析了高速公路网养护站布局与选址的影响因素，运用组合优化理论，构建了基于时间序列的、生命周期成本的高速公路网养护站CFLP布局模型，解决了传统的CFLP法在不考虑运营成本的情况下仅靠经验来确定高速公路网养护站布局的不足。
This thesis is a try to ingress general marketing theory into wood-processing corporation when I was practising in Shun De Hualong Furniture Corporation Limited starting from marketing concept, emphasize discussing the performance and influence of market investigation, segmenting and positioning, product life cycle, price, place, promotion and corporation. Meanwhile, I try to a apply such tactics into practical marketing activity and demonstrate the great significance of marketing for wood processing corporation to develop market space in both theory and practice.
本文是作者在华龙家具公司实习期间，将通用营销理论导入木材加工企业的一次尝试，着重从市场营销的概念和观念入手，探讨营销调研、市场细分与产品定位、产品生命周期、产品组合、价格、营销渠道、促销及企业形象识别等因素对木材加工企业市场营销的作用和影响，并力图将上述策略应用到市场营销活动之中，进而从理论与实践两方面论证市场营销对木材加工企业拓展市场空间，提高经济效益的重大意义。
According to the change of the enemy's quantity and the qualitative theory of the differential equation, we research the spruce aphides and its predator system. At the same time, we discussion the spruce aphid multiplication model when the natural enemy quantity is a certain value and the periodic oscillating model whose the quantity of the natural enemy changes along with the time. Obtains the stability condition of the balance point and the limit-cycle existing condition, the system presents the dissipative structure's character. Finally it explains that this theoretical analysis has certain practical significance regarding the preventing and controlling harmful insect.
第五章，松毛虫与其天敌的关系是食饵和捕食者的关系，根据天敌数量的变化，利用微分方程定性理论，研究松毛虫与天敌系统，讨论天敌数量为一定时的松毛虫增殖模型和天敌数量随时间变化的周期振荡模型，得到正平衡点全局稳定性和极限环的存在条件，通过计算机模拟，说明周期振荡的捕食模型能够呈现典型的时间耗散结构特征，对于防治害虫有一定的实际意义。
This paper will first study the theory and method for the pulse width modulation of the dc-dc converter, and then use the method of digital logic circuit to design a pure digital PWM controller, and implement it with FPGA. At last, it will control the duty cycle of the digital PWM controller by combining an 8-bit A/D converter, and apply it to the buck dc-dc converter.
本论文首先研究直流对直流转换器之脉波宽度调变的理论与方法后，再利用数位逻辑电路之方法，设计一个纯数位式PWM控制器，并使用FPGA来实现，最后配合一个8 bit A/D转换器，以控制数位PWM控制器输出之责任周期，并应用於降压式直流对直流转换器。
In the late-1980s, overseas presented some to study the developing country the foreign direct investment theory, like Dunning (Dunning, in the 1980s) the investment development cycle theory, the Laao (lall, 1977) technology localization theory, the Wells (Wells, 1983) small scale technology theory, Kanter Vyell and Toland raised (Cantwell and Tolentino, in the late-1980s) technological innovation industrial upgrading theory and so on.
20世纪80年代后期，国外出现了一些研究发展中国家的对外直接投资理论，如邓宁（Dunning，20世纪80年代）的投资发展周期理论、拉奥(lall，1977)的技术地方化理论、威尔斯(Wells，1983)的小规模技术理论、坎特维尔和托兰提诺（Cantwell and Tolentino，20世纪80年代后期）的技术创新产业升级理论等。
Reliability about on-line system was analyzed from its getting parameters, theory adopted and model selection of low cycle fatigue life.
同时，从系统参数采集、在线应力计算理论和低周疲劳寿命损伤模型选用三方面分析了影响在线寿命监测系统可靠性的因素，评价了现有在线监测系统可靠性。
There are cycle of 20ka, 40ka, and 100ka in geomagnetic intension change. Milankovitch theory can't explain a fact of same phase on climatic change over Antarctic and Arctic area, and appearing of 3 times Ice Age over Plateau since 700kaB. P.. Maybe, Cosmic-geomagnetic coupling hypothesis could influence the evolution of earth's system on million scale.
地磁场强度的变化亦有2万年、4万年及10万年左右的周期，而米兰柯维奇理论无法解释南北极地区气候变化基本同相的事实，也无法解释70万年来高原出现过的3次冰期，宇地磁耦合假说似乎也适合万年尺度的地球系统演化。