查询词典 difference boundary value problem

The large altitude difference of the hypsography, the fragmental topography, the difference of exposure and the valley cause the difference of the part climate which make the orographic rain , the topography wind and the temperature inversion.

由于地势高差悬殊、地形破碎和坡向、谷向的不同，常引起局部气候差异，多地形雨、地形风和逆温现象，形成不同的小气候。

In this paper, a high order accuracy difference method is presented for solving unsteady convection diffusion equation by using Implicit Perturbation Finite Difference scheme. Firstly, we use the steady convection diffusion equation, the constant coefficients of this equation are expanded to power series of grid-spacings, then the high-order Perturbation Finite Difference scheme is obtained by determining the coefficients of the power series. Put this scheme on unsteady convection diffusion equations and modified it, the IPFD scheme is constructed.

本文利用摄动差分思想，对定常对流扩散方程中的空间微商系数进行摄动展开，展开幂级数系数通过消去摄动格式修正微分方程的截断误差项求出，由此获得方程的隐式摄动差分格式，将此方法应用于非定常对流扩散方程，并加以修正，得到该方程的修正隐式摄动差分格式。

If the minuend is larger than the subtrahend, the difference will be positive; if the minuend is smaller than the subtrahend, the difference will be negative; and if they are equal, the difference will be zero .

如果减数大于减数，差异将是积极的；如果减数小于减数，差额将负面的影响；如果他们是平等的，差额将为零。

Distribute the nonrecognition class difference according to one's performance, the physical labour difference admitting people and the individual consumer's goods coming into being from this are assigned and better-off degree difference.

按劳分配不承认阶级差别，只承认人们的劳动差别及由此产生的个人消费品分配和富裕程度的差别。

Chapter 2, we investigate the existence of multiple positive solutions of the neutral partial difference equations on the base of the existed results of partial difference and difference equations, and obtain some sufficient conditions for the existence of multiple positive solutions.

第二章，基于已有的偏差分方程和差分方程的结果，我们研究了高阶非线性中立型偏差分方程多正解的存在性问题，建立了判断多正解存在的充分条件，对前人的结果进行推广。

Such a difference may be categorized as permanent difference and temporary difference.

产生的计税差异可分为永久性差异和暂时性差异。

This paper systematically analyzes the temporary differences from two aspects of initial recognition and further recognition,and then summarizes the similarities and differences between temporary difference based on asset-liability view and timing difference and permanent difference b.

按照资产负债观的收益理念，会计收益与应税收益之间的差异表现为资产、负债的账面价值与其计税基础之间的差异——暂时性差异。

This paper systematically analyzes the temporary differences from two aspects of initial recognition and further recognition,and then summarizes the similarities and differences between temporary difference based on asset-liability view and timing difference and permanent difference based on revenue-expense view.

其中，应纳税暂时性差异在未来期间转回时将调增转回期间的应税所得，而可抵扣暂时性差异则调减转回期间的应税所得。从资产角度分析，一项资产的确认意味着该资产的账面价值在未来期间将以流入企业经济利益的形式收回。

Difference set is one kind of unbounded difference poset. The existenceof the tensor products of two cancellative difference sets are investigated. It isproved that the tensor product of a Boolean algebra and a cancellative differenceset always exists.

作为差分偏序集无界推广的差分集，我们研究了它的张量积问题，证明了任何消去差分集和布尔代数的张量积一定存在。

The difference between the test groups and the control group was statistically significant. It could be deduced that all the insecticides tested in this experiment damaged the spiders′ intestinal mucosa, compromising its function as a barrier and letting large molecules such as FTIC-D more easily penetrate. Among the insecticides, pyrethrin and Bt preparation are bio-insecticides, and the FITC-D concentrations of the spiders exposed to these two bio-insecticides were more than those of the spiders exposed to the chemical insecticides imidacloprid and dipterex. The difference between the bio-insecticide groups and the imidacloprid group was significant, but there was no significant difference between the bio-insecticide groups and the dipterex group.

结果表明：4种杀虫剂处理后拟环纹豹蛛血液中的荧光素浓度远高于对照组，各个处理组拟环纹豹蛛血液样本中的荧光素浓度均与对照组存在极显著差异，可见4种杀虫剂均将对拟环纹豹蛛肠黏膜的屏障功能造成损伤，导致大分子物质易于通过；其中1.5%除虫菊素水乳剂三保奇花和Bt制剂强杀处理后拟环纹豹蛛中肠黏膜的通透性高于仿烟碱类化学杀虫剂吡虫啉处理组，差异达到显著水平，但与有机磷杀虫剂敌百虫处理组差异不显著。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。