查询词典 at present

Aiming at the measure of expressway slope protection with greensward in China at present the reinforcement mechanism is analyzed and the reinforcement effect is studied experimentally .

针对目前国内植草护坡这一高速公路边坡防护措施，分析了植草护坡的加固机制，对根系护坡的锚固效应进行了试验研究。

One points at a sequence of one sparse linear algebra system of equation ,utilizing frequent treatment sparse matrix data structure at present that is according to the competent store structure, design the law of conjugation gradient method which solves the equation group of the sparse linear algebra of asking analyses the complexity of calculating.

第一部分针对一类稀疏线性代数方程组，利用目前国际上使用比较频繁的处理稀疏矩阵的按行稀疏存储结构，设计了求解稀疏线性代数方程组的共轭梯度法，并分析计算复杂度。

In this thesis the process of constructing the non-perturbative Hamiltonian theory is de-scribed and is applied to estimate the vacuum condensate. It contains the following contents:At the very beginning, by using the path integral method and eliminating the gluon freedom, aGCM action 〓 of current quarks including lower order current-current coupling was derivedfrom the QCD Lagrangian and the effective Hamiltonian operator that could hardly be doneby the normal methods was derived. After doing this, the broken vacuum is introduced whichincludes quark-antiquark condensate through the generalized Bogoliubov-Valatin transformation,the effective Hamiltonian of constituent quark was derived. The detailed formulas containingthe spatial current-current coupling term for the effective Hamiltonian and gap equations wasworked out by parameterizing the correlation kernel as a quadratic potential. And then, the gapequation was solved and the quark-antiquark condensate of vacuum was studied both in the casesof instantaneous interaction and retarded interaction. In the end, the effective Hamiltionian withtwo-body quark-quark interaction was derived with one-body approximation, and with the helpof the functional integral method the coupling non-linear dynamic equations for systems withnuclear matter was derived. Finally, these equations were solved by selfconsistent method andthe effect of nuclear matter on vacuum condensate was studied. The spatial current-current coupling term is too difficult to handle, hence the correlationkernel is assumed to be not important and usually omitted in the pure vacuum condensate, andthe instantaneous interaction generally is adopted. Retaining the spatial current-current termand partial retardation effect, the quark pairs condensate in pure vacuum was studied, and theeffect of quark mass was also studied. At present, little study is focused in the case with nuclearmatter and spatial current-current term also omitted. Under the approximation with partialspatial current-current term, the effect of nuclear matter on vacuum condensate was studied.

本论文描述了量子色动力学整体色对称模型哈密顿量方法的构建过程，得到了反映正反夸克对凝聚真空结构的关于组分夸克的有效哈密顿量算符，它隐含了胶子作用，并且准确至流-流耦合项；接着，通过参数化哈密顿量中的夸克作用关联核，导出平方禁闭势参数化选择的哈密顿量的具体公式和能隙方程；随后，应用公式，编程求解，考察了瞬时作用下和部分延迟作用下真空的正反夸克对凝聚，在计算中保留了空间流-流耦合作用；之后，导出瞬时势和延迟势下包含二体作用项的哈密顿量公式，并采用单体化近似，通过泛函变分方法得到核物质存在时耦合的非线性动力学方程；在保留部分空间双流耦合作用的近似下，求解核物质的动力学方程，考察核物质密度对真空凝聚的影响，以往考察真空凝聚，对关联核的选用，由于空间流-流耦合项不易处理，也认为作用不大，常忽略该项，并且常采用瞬时作用；本文保留空间双流项和部分延迟作用，考察了真空情形的夸克对凝聚，还考察了夸克质量对纯真空凝聚的影响，以往对核物质存在情形的真空凝聚考察很少，也都忽略空间流-流项，本文在考虑部分空间流-流项近似下，考察了核物质存在对真空凝聚的影响。

Basically be to consider development study at present, with a system that develops at oneself, basically be to drill the hand is used anyway, do not have commercial side scruple.

目前主要是想深入学习，用于自己开发的一个系统，反正主要是练手用，没有商业方面的顾忌。

At present, headphones at home and abroad enjoy a relatively high reputation.

目前，耳机在国内外享有较高的声誉。

I am seventeen years old and at present I am studying English and economics. When I leave school, I hope to take a course in hotel management. During the school holidays last summer, I worked as a waiter at the Central Hotel. The headwaiter there, Mr. Macintosh, will be pleased to send you a recommendation for me.

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At present, China s real estate development is at a new round of high tide.

中文摘要：当前，我国房地产业正处于新一轮的发展高潮。

At present, Chinas real estate development is at a new round of high tide.

当前，我国房地产业正处于新一轮的发展高潮。

Current , many construction companies are using organizational system cost house appeared not to fall high on outside service team , technology of much , core turns issue of benefit prediction of a person s luck in a given year , economy hollowly wait for malpractice , the fatigue make sure that makes major company is used at present is challenged with administrative pattern , take service construction arise at the historic moment oneself then .

目前，不少施工企业在使用成建制外部劳务队伍上出现了成本居高不下，效益流失，经济纠纷多，核心技术空心化等弊端，使大部分企业目前采用的劳务使用管理模式受到挑战，于是自带劳务施工应运而生。

At present, it is hurtling through the cosmos at 124,300 kilometers per hour (77,200 miles per hour).

目前，她正以每小时12万4000公里的速度在宇宙中飞奔。

We are in a real jam.

我们的麻烦大了。

Hey, it's Ahmet from India, that foreign exchange guy.

看，那是印度的阿曼特，国际交换生