查询词典 potential barrier

Based on the FDTD method,three different potential-barrier problems including rectangular potential-barrier,deltoid potential-barrier and syntonic potential-barrier are investigated.

在此基础上，计算模拟了三种不同的势垒如方势垒、三角形势垒和谐振势垒下系统的能量变化、概率变化，再现了量子隧道效应这一重要物理现象。

The World Trade Organization was precisely acknowledged the technical trade barrier reasonable permitted its existence at the same time, simultaneously also saw the technical trade barrier unreasonable has at the same time formulated "Technical Trade Barrier Agreement", came the standard and limits various member nations the technical trade barrier behavior, guarded against stops appears to technical trade barrier abusiveness

世界贸易组织正是承认了技术性贸易壁垒合理的一面而允许其存在，同时也看到了技术性贸易壁垒不合理的一面而制定了《技术性贸易壁垒协议》，来规范和限制各成员国的技术性贸易壁垒行为，防止出现对技术性贸易壁垒的滥用

The first one is capital barrier, which means a large amount of initial capital for the perfect monopolizer. This prevents the common enterprise from entrance. The second is the technical barrier, i.e. the monopolizer is in control of certain technology and knack while other enterprises not, and then the market naturally become a monopoly market. Scale economy is the most studied technical barrier. The third one is law barrier, i.e. some exclusive patent rights are protected by the law. For example, patent and copyright are the monopolizations protected by the law. The fourth one is tactic barrier, even without any of the above mentioned barriers; it can also set up barriers through other ways, such as huge amount of advertisement investment.

首先是资本壁垒，即完全垄断企业的起始资本量很大，因此一般的企业难以进入；其次是技术性壁垒，即垄断者掌握了某种生产技术和诀窍，其他企业则没有，这个市场也就自然成了垄断市场，规模经济是一种被研究得最多的技术性壁垒；第三是法律壁垒，有些独家经营的特权是由法律所规定并受到法律保护的，专利和版权就是法律特许的垄断；第四是策略性壁垒，企业即使没有上述三种壁垒，也可以通过其他方式高筑壁垒，例如巨额广告投入。

The new non-tariff barrier system consists of technical barrier, environmental barrier, social barrier and moral barrier.

随着世界贸易组织对关税和传统非关税壁垒的约束，非关税壁垒形成以技术壁垒为核心的，包括技术壁垒、环境壁垒、社会壁垒和道德壁垒在内的新体系，成为当代国际贸易的新贸易壁垒。

Part 1: Permeability of Exogenetic BDNF through placental barrier of pregnant rats and blood-brain barrier of fetus with transient uteroplacental ischemiaObjective To investigate the potential of BDNF to penetrate the placental barrier and get into the fetus and pass through the blood-brain barrier of fetus to play neuroprotective function in the condition of transient ischemia.

第一部分：外源性脑源性神经营养因子在宫内缺氧环境中对胎盘及胚鼠血脑屏障通透性的实验研究目的：探讨外源性脑源性神经营养因子在宫内缺氧环境下能否通过胎盘屏障进入胎鼠体内，再通过胎鼠血脑屏障进入胎鼠脑组织而发挥其生物功能。

It is still needed to do some work to determine the deformation parameter β2 for light odd-odd nucleus, like 6Li and to calculate all reaction channels by means of CDCC code simultaneously. It is important to measure the exclusive angular distributions of breakup fragments.In theory, the coupling channel equations have been deduced from one-dimensional to multi-dimensional barrier tunneling. The couplings between the entrance channel and the other channels have appreciable effects on sub-barrier fusion cross section. Instead of single fusion barrier,these couplings lead to a distribution of fusion barrier Dfus.

描述了已有理论，从简单的一维势垒穿透模型出发，引入多维势垒穿透和耦合道模型，证明入射道相对运动与碰撞核各种自由度的耦合导致熔合势垒的劈裂，较低的势垒有利于垒下熔合截面增强；给出了从熔合激发函数抽取势垒分布及从背角准弹激发函数抽取势垒分布的理论依据，以及它们的优缺点。

Mahabharata止观" on the roof were made a brief description of the six Guanyin:"Great Mercy Guanyin hell broke three barriers, the Road suffered the most, to use the 'Great Mercy'; Daiji hungry Road Avalokitesvara three barrier-breaking, the Road, hunger, thirst, to use the 'Daiji'; Lion Road fearless beasts Avalokitesvara three barrier-breaking, the mighty Project Altered Beast, to use the 'fearless'; Guanyin shines Daguang Asura three barrier-breaking, the Road suspicion suspect envy, to use the' weather '; Heaven Avalokitesvara husband three barrier-breaking humanity, humanity has the good sense, things slow V uppish said 'Heaven', rationale, see Buddha, saying that 'her husband';破天Road Avalokitesvara大梵three far-reaching impairment,'the Vatican' is a King, S Wang Hill.

摩诃止观》对天台宗六观音作了简要说明："大悲观世音破地狱道三障，此道苦最重，宜用'大悲'；大慈观世音破饿鬼道三障，此道饥渴，宜用'大慈'；师子无畏观世音破畜生道三障，兽王威猛，宜用'无畏'；大光普照观世音破阿修罗三障，其道猜忌嫉疑，宜用'普照'；天人丈夫观世音破人道三障，人道有事理，事伏憍慢称'天人'，理则见佛性，称'丈夫'；大梵深远观世音破天道三障，'梵'是天王，标王得臣。"

Combining the fluid mechanics in porous medium and the geometry, the author considers the artificial barrier as a filter cake, research on the vadose rule on the condition of the coercibility and the non-Newtonian fluid flow, establish the formula of artificial barrier pressure drop and thickness, probe the formula of the thickness of artificial barrier for the pressure in the fracture,the coercibility, the smallest stress of barrier and the rheological property of fracturing fluid.

结合渗流力学和几何学，将人工隔层视为滤饼，在对人工隔层中渗流规律的研究中考虑了流体的非牛顿性和人工隔层的可压缩性，建立隔离层压降与厚度之间的关系式，探索人工隔层厚度与缝内压力、人工隔层可压缩性、上下隔层最小主应力、压裂液流变性等之间的关系。

From the potential energy profile, it can be predicted that, the dominant channel of this reaction consists of three steps: the two reactants first form a three-membered ring intermediate (INT1) through a barrier-free exothermic reaction of 19.2 kJ/mol; three-membered ring intermediate (INT1) isomerizes to a four-membered ring silylene(P2) via the transition state (TS2) with an energy barrier of 22.8 kJ/mol; four-membered ring silylene(P2) further reacts with ethene(R2) to form a silicic bis-heterocyclic compound (P3), which is also a barrier-free exothermic reaction of 132.2 kJ/mol.

用CCSD//MP2/6-31G*方法研究了单重态二甲基亚烷基硅烯与乙烯生成硅杂双环化合物环加成反应的机理，根据该反应的势能面可以预言，该反应的主反应通道有三步组成：第一步是两反应物（R1， R2）首先生成了一三元环中间体（INT1），它是一无势垒的放热反应，放出的能量为19.2 kJ/mol；第二步是三元环中间体(INT1)经过渡态TS2异构化为了四元环硅烯（P2），其势垒为22.8 kJ/mol；第三步是四元环硅烯（P2）进一步与乙烯(R2)反应生成了硅杂双环化合物（P3），该反应也是一无势垒的放热反应，放出的能量为132.2 kJ/mol。

In order to prove the importance of three-body interaction, accurate ArH〓 potential surface and accurate ArAr potential surface are added to construct a two-body potential surface. We found that this potential surface is corresponding with a deep potential well and a tight structure, which is far from the real structure of Ar〓H〓. Obviously, this two-body additive potential surface is not suit in this system.

为了证明三体作用在体系中的重要性，我们用精确的ArH〓的势能面与精确的ArAr的势能面构造了一个两体加和的势能面，发现两体加和的势能面表现的是一个深势阱的紧凑结构，与Ar〓H〓的结构相去甚远，因此可以确认，两体加和在此系统中是不适用的。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？