查询词典 conservation of charge

Based on the quality of conservation, conservation of momentum and energy conservation principle, three-dimensional steady hydraulic mathematical model and its boundary conditions have been deduced out

基于质量守恒、动量守恒和能量守恒原理，建立天然气管道三维稳态水力计算的数学模型，并给出了模型的边界条件

The thesis can be divided into five parts as follows: First, the structural characteristics of finned-pipe evaporator are analyzed. After selecting suitable microelement controller, the heat-transfer and mass-transfer processes are analyzed for every microelement under the conditions of dryness, wetness and frostiness. Based on previous equations, some parameters of frostiness are confirmed and the frost-growing model is set up under frost condition. Some hypotheses are postulated and with the help of the equation of mass-conservation, energy-conservation and momentum-conservation, the evaporation model which fits in the dynamic simulation is built, which set a solid foundation for system simulation. Second, the starting and stopping behaviors under disturbed condition are analyzed and calculated by using the dynamic concentrative parameter model, which gives some advice to better prescribe refrigeration system and set theoretic foundation for carrying out automatic control of refrigeration system. Third, the normal running process is analyzed and calculated by means of rational matching theory, which gives some advice on how to better understand the parameter change under steady state and the affection of inlet-parameter on evaporator. Fourth, the simulation software with dynamic characteristic is designed, which can be applied to calculate thernio-parameter of cryogen, air humidity and frost thickness under different initial and boundary conditions, and to carry out dynamic simulation under conditions of dryness, wetness and frostiness, at the same time, to achieve detection and simulation at any stage from starting to stopping.

本文的主要内容如下：1对翅片管蒸发器结构特点进行分析，选取适当的微元控制体，就干、湿和霜工况下对每个微元分别进行传热传质分析，基于经验关系式确定霜的有关参数，对于霜工况下的霜生长建立模型，经适当假设，运用质量守恒、能量守恒和动量守恒方程建立适合动态仿真的蒸发器数学模型，为系统仿真奠定基础； 2对蒸发在大扰动下的开、停机过程，运用动态集中参数模型进行分析和计算，为更好地描述制冷系统运行的全过程奠定基础，同时也为制冷系统实现自动控制提供一定的理论基础； 3对蒸发器正常运行过程，运用动态分布参数和参数间定量耦合的观点来分析和计算，为更好地了解稳态工况下各点参数的变化情况及各入口参数对蒸发器动态特性的影响即蒸发器性能对各参数变化的敏感性； 4编写翅片管蒸发器动态特性仿真计算程序，可以计算不同边界条件和初始条件下的制冷剂热力参数、空气温湿度和霜厚度分布场，实现对翅片管蒸发器在干、湿和霜工况下的动态仿真。

The protection measures were proposed based on the discussion of the status and trends of the population viability. The results will enrich the studies on conservation of endangered plants, and improve the cross researches of population ecology and conservation biology, and provide the scientific guidance for conservation of Cycas fairylakea population.

研究结果不仅丰富和发展了珍稀濒危植物保护研究的理论和方法；而且有利于种群生态学和保护生物学交叉领域研究的进一步深入；同时为仙湖苏铁种群保护对策的制定以及保护行动的开展提供了科学依据和方法指导。

To put it briefly, they think water and soil conservation only make soil, stone and dreg fixed, in another word, not allow it take place displacement, it doesn't deeply prevent land from degrade in the land care that make the guidelines of the projects, the measure adopt in water and soil conservation, etc. differ from the basic goal of water and soil conservation greatly.

简单的说，认为水土保持仅仅是把土、石、渣固定下来，即不让其发生位移，没有深入到防止土地退化方面的土地保育，使得方案的指导思想、采用的水土保持措施等与水土保持的根本目的相去甚远。

For the two-phase flow section, the homogeneous model was applied. The fundamental equations such as the conservation of mass, the conservation of energy, and the conservation of momentum were applied to the every section.

采用该关系式可以准确的计算不同结构的节流短管，在各种运行工况下的流量，这为跨临界CO〓系统的设计提供了更为准确的节流机构模型，是本文研究内容的创新点之一。

In the modified Newtonian mechanics, the law of conservation of momentum and the law of conservation of energy become invalid; instead, the inherent momentum and inherent kinetic energy can be defined to make the law of conservation of inherent momentum and the law of particle inherent kinetic energy valid.

在修改后的牛顿力学中，动量守恒定律和能量守恒定律不再成立，但可以定义固有动量和固有动能，使得质点系固有动量守恒定律和质点固有动能守恒定律成立。

Shifting migratory routes for endangered species such as the leatherback turtle could complicate what are already tricky conservation challenges for wandering sea creatures, says Lee Hannah of Conservation International in Washington, D.C.:"They re going to start turning up in places where there may not be conservation measures in place."

濒危物种迁徙路线的改变使已有的保护措施更加复杂化例如革龟，这些保护措施本身对于四处游走的海洋生物已是一个相当大的挑战，位于华盛顿的国际环保组织的李汉娜说，"这些物种开始在没有采取保护措施的海域出没。"

Conservation of mass.conservation of moment muni and conservation of energy are basic regularity obeyed by all movement in nature.For a certain problem in natrue .if we quantify the corresponding conversation law . we can deduce partial differential equation reflecting this problem .and every differential equation reflecting a special physical phenomenon on certain codition.

质量守恒、动量守恒和能量守恒是自然界一切运动所遵循的基本规律，对于自然界的某一特定问题，如果把相应的守恒律数量化，就导出刻划这个问题的微分方程，每一个微分方程都在一定条件下刻划了某一特定的物理现象。

The Guangzhou Jin Bao Trade Co., Ltd. is a professional in the business of automobile maintenance supplies trade companies, is the world famous automobile producers - the conservation of Japan westernize Research Corporation Commissioner in China, Hong Kong and Macao regions of vehicle maintenance products easy Exclusive agents; agents also world-renowned multi-brand car for conservation: soft, this is dedicated to domestic owners of vehicles with world-class conservation goods, to let the owners of the car and get the best maintenance.

广州劲之保贸易有限公司是一家专业从事经营汽车养护用品的贸易型公司，是全球知名汽车养护品生产商---日本关西化研株式会社在中国、香港、澳门地区的汽车保养易系列产品独家代理商；同时还代理多世界知名汽车养护品品牌：soft等，本公司致力于为国内车主提供世界一流的汽车养护品，让广大车主的爱车得到最好的保养。

Pearlite inflation electric stove environmental protection energy conservation, and applies the microcomputer automation inflation agglutination process the pearlite inflation electric stove, can the completely automatic produce the upscale foramen obturatum inflated pearlite product, applies the pearlite keeps warm Sha Jiang to construct the energy conservation, the heat preservation building materials, the dalle, the heat insulation fire protection, the light quality energy conservation refractory brick and so on wide realm.

珍珠岩膨胀电炉环保节能，并且将微电脑自动化膨胀烧结过程应用到珍珠岩膨胀电炉，能全自动生产出高档闭孔膨胀珍珠岩制品，将珍珠岩应用到保温沙浆建筑节能、保温建材、装饰板、隔热防火、轻质节能耐火砖等广泛领域。

I think people in this lifetime in a rebirth.

我觉得人在这一生里其实也在轮回。

He had to tie her hands together.

他不得不把她的双手绑在一起。