原理

Moreover,the pretreatment of various kinds of materials,spectrum interference factors and eliminating methods were discussed.

文章对原子吸收光谱仪在电池工业材料分析与测试中的实际应用进行了综述。1原子吸收光谱仪的基本原理、分析方法、材料溶解与测定条件1.1基本原理文章以日本岛津公司A A-670型原子吸收光谱仪和美国热电公司5M型原子吸收光谱仪为分析用仪器。

Following the rules of machining and outspread principle of involutes,the mathematical model of spur gear teeth profile is built.

根据齿轮加工原理及渐开线展开原理，建立了直齿轮齿廓的数学模型。

The principle new development of modern irrigation engineering.

灌溉原理与技术》是农业水土工程学科中一门理论与技术兼备的专业课程，主要讲授现代科学灌溉理论的生理学和物理学基础，作物需水量计算理论与方法，非充分灌溉的科学依据与研究进展，现代灌溉方法的原理与研究进展，旨在使学生掌握现代灌溉学科的基本理论，了解本学科的关键技术、发展趋势与存在的问题，掌握相应的工程技术，培养学生建立现代灌溉的新观念和新理念，在理论和实践上奠定学生深入研究灌溉学科中的有关理论和技术的创新能力基础。

Common Law Judge-Made Law Based on the theory of Precedent Precedent Contract Dispute Legal Ruling Precedent - a legal principle established in previous court decisions which involved similar or analogous fact situations.

普通法 衡平法基于先例的理论先例合同纠纷法律规则先例-一种建立在前一个类似案例的法庭宣判结果的法律原理。一种建立在前一个类似案例的法庭宣判结果的法律原理。

A brief introduction was given to the concept of natural tracer method, the characteristics of temperature and conductance distribution in groundwater, and the theory of heat-source method and conductance method for leakage detection.

摘要简述天然示踪法的概念、地下水温度场和电导场分布特征、热源法原理及电导渗漏测试原理。

To make a comprehensive view of metapopulation researches, we folly analyze and summarize the present concepts, theories and models of metapopulation in this paper, which primarily includes the dynamical models and simulation approaches of single and competitive metapopulations. Based on the Levin's patch occupant model, the center framework of metapopulation researches, primary principles and mechanisms are discussed. First, Levins rule: the fraction of empty patch will remain constant with habitat destruction as long as metapopulation survives. This rule implies that empty patches have determinant effects on persistence and conservation. Second. Allee effect of metapopulation is incurred by establishing difficulties and dispersal costs, which is important to the studies of reserve area and the minimum available metapopulation size. Third, we analyze the rescue effect that immigrants can reduce the extinction risk of the presented local population. Rescue effect can leads to the improvement of metapopulation sustainability and the decrease of fraction of empty patches. Fourth, the coexistence mechanism of two competing metapopulation is discussed, which suggests that competition-colonization trade off may be prevalent in competing systems. Finally, extinction debt ob tamed from coexistence mechanism is given, which depicts the lost of species richness in the future for the current habitat destruction. After theoretical discussion, we present two popular simulated approaches in metapopulations: probability transition model and stochastic process model.

为了能总观集合种群进展的全局并开展进一步的工作，首先对集合种群的已有概念、理论和模型做了全面的分析和总结；其次对集合种群的发展和概念进行了探讨，以集合种群模型的中心框架：Levins的斑块占据模型为基础，展开对其它原理、效应和机制的探讨；主要包括了Levins原理，即当生境进到破坏时，空斑块比例在集合种群灭绝前保持不变，然后还分析了Allee效应（集合种群的Allee效应主要是由于建群困难和扩散损失造成的）；第三，分析了援救效应：迁人个体可以降低斑块中现有局域种群的灭绝风险，援救效应会增强集合种群的生存力，使空斑块比例下降第四，探讨了两竞争集合种群的共存机制，即竞争－侵占妥协，其共存机制为空间生境中物种共存提供了有力的理论解释。

Library science can be divided into principle and application, the latter is more important. As parts of library science, bibliography, edition collection should syncretize western methods and Chinese tradition, and make the western methods suitable to Chinese practice.

在图书馆学问题上，他强调图书馆学应分原理、应用两个层面，应用重于原理；传统的目录学、校雠学是图书馆学之一部分，应取欧美之成法与之融汇贯通；图书馆学不能从西方原汁原味地照搬，必须进行中国化。

John Faulkner, of the Lick Observatory in California, has suggested an interpretation of these remarks which flies in the face of the Newton legend, but closely matches Newton's known character.

然而，在牛顿出版于1687年的具有划时代意义的论文集《原理》(也即《自然哲学的数学原理》)中，在讲述万有引力定律时，牛顿却只字不提胡克的帮助。

Meanwhile,the author presents the critical technology and safety requirements of increased safety lightings.

根据照明电器技术和防爆原理，分析了增安型灯具允许使用、以及不允许使用的光源及其工作原理，阐述了增安型防爆灯具的关键技术及安全要求。

The correctness of logic theory is one of the most important factors in relay protection. This paper validate the testing function of medium and low voltage line protection through the relay protection testing system based on virtual instrument developed by ourselves, so as to make the validation of the correctness of logic theory be independent of the relay protection devices'software and hardware.

保护逻辑原理的正确性是继电保护能可靠动作的重要因素之一，本文采用自行研制的基于虚拟仪器的继电保护测试系统对中低压线路保护测控功能进行了验证，确保保护逻辑原理的正误与微机继电保护装置软硬件无关。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。