在改进

The converter can be improved just by exchanging the position of the resonant inductance and the transformer such that the transformer is connected with the lagging leg. The improved converter has several advantages over its counterpart, e.g., the clamping diodes conduct only once in a switching period, and the resonant inductance current is smaller in zero state, leading to a higher efficiency and reduced duty cycle loss. The operation principle of the improved converter and the comparison with the original converter are analyzed in this paper. The effect of the blocking capacitor in series with the transformer or resonant inductance is discussed, and a best scheme is determined.The improved converter is adopted to design the DC/DC converter of secondary power supply in HVDC power system.

本文将谐振电感和变压器交换位置，使变压器与滞后桥臂相连，这样箝位二极管在一个开关周期中只导通一次，同时零状态时谐振电感电流较小，有利于提高变换效率和减小占空比丢失，本文分析改进后变换器的工作原理，并与改进前的变换器进行对比，讨论隔直电容在不同位置对变换器工作的影响，确定一种最佳工程方案。

In this paper, we introduce the algorithm of Schoof-Elkies-Atkin to compute the order of elliptic curves over finite fields. We give out a fast algorithm to compute the division polynomial f〓 and a primitive point of order 2〓. This paper also gives an improved algorithm in computing elliptic curve scalar multiplication. Using the method of complex multiplication, we find good elliptic curves for use in cryptosystems, and implemented ElGamal public-key scheme based on elliptic curves. As a co-product, we also realized the algorithm to determine primes using Goldwasser-Kilian's theorem. Lastly, the elliptic curve method of integer factorization is discussed. By making some improvement and through properly selected parameters, we successfully factored an integer of 55 digits, which is the product of two 28-digit primes.

本文介绍了计算有限域上椭圆曲线群的阶的Schoof-Elkies-Atkin算法，在具体处理算法过程中，我们给出了计算除多项式f〓的快速算法和寻找2〓阶本原点的快速算法；标量乘法是有关椭圆曲线算法中的最基本运算，本文对[Koe96]中的椭圆曲线标量乘法作了改进，提高了其运算速度；椭圆曲线的参数的选择直接影向到椭圆曲线密码体的安全性，文中利用复乘方法构造了具有良好密码特性的椭圆曲线，并实现了椭圆曲线上ElGamal公钥体制；文中还给出了利用Goldwasser-Kilian定理和椭圆曲线的复乘方法进行素数的确定判别算法；最后讨论了利用椭圆曲线分解整数的方法并进行了某些改进，在PC机上分解了两个28位素数之积的55位整数。

The continuity and differentiability for composite function are the important content in advanced mathematics.

对高等数学中复合函数的连续性条件进行了弱化改进，得到了类似复合函数连续及在x0处极限存在的充分条件，对复合函数的可微性条件进行改进，得到了复合函数可微以及在x0处存在左右导数的充分条件。

The application of the lattice Boltzmann method in unsteady open channel flows was studied in detail in the paper. An existing lattice BGK model was mended; For the problem of negative local equilibrium and evolutionary distribution, we proposed a lattice Boltzmann model based on cell-population equilibrium, which is a direct non-negative approximation to the continuous Maxwell distribution. The model reduces the transport and collision, two basic evolution steps in the LB model, to transport of the non-equilibrium distribution.

本文系统的研究了格子Boltzmann 方法在明渠非恒定流中的应用问题，改进了一个现有的LB 模型，数值实验表明此改进是有效的；在平衡态分布函数及分布函数的非负性问题上，作者提出了一个基于单元均衡的格子Boltzmann 模型，通过直接对Maxwell 分布函数的离散化实现对速度分布函数的非负离散，这种方法将传统模型演化过程中的碰撞和输运两个步骤直接表现为粒子的输运。

Many technical measures have been taken as follows to ensure the safety management: a. operation steps of installing the cross joints are improved to guard against damage on metal sealing and the hanger; b. well logging is applied to gas testing so as to achieve early warning in a scientific way; c. the burning processing unit of QTI3000 is widely used to reduce the bad impact on the environment; d. the articulation of perforating gun is improved to alleviate labor intensity and shorten the perforating time so as to shut down the well promptly in case of any accidents.

在安全技术措施上，改进了坐完井悬挂器操作步骤，避免损坏金属密封，造成悬挂器损坏；将录井技术应用于试气作业，实现了科学预警；推广应用了QTI3000型焚烧处理装置，降低了对环境的不良影响；改进了射孔枪的连接方法，减轻了工人的劳动强度，缩短了起射孔枪时间，能在起钻发生井喷失控前及时控制关井。

I think training with the first team every day makes you realise you need to improve almost everything. I think I can improve in all areas of goalkeeping, but especially physically and also in dealing with the pace of the game because it is really quick, even in training. It is even quicker in a match and only the best players can deal with it.

我认为与一队每一天训练让你了解到你必须改进全部的东西，我认为我在门将领域已经改进不少，特别是身体方面，还有比赛的节奏的控制，因为它太快了，甚至是在训练，比赛中甚至会更快，只有顶级球星能够滴水不漏处理它。

On the basis of the improved structure and under the premise of meeting specification requirement, the light steel door-truss structure is optimally designed by changing, cycle checking and gradually reducing the cross section size of overall structural member with the ANSYS parametric design language. The mechanical properties such as changes in stiffness, strength and stability of the optimized structure are completely analyzed under three load cases.

基于改进结构，在满足相关规范的前提下，利用ANSYS软件的参数化命令流语言（ANSYS parametric design language， APDL），通过改变结构杆件截面尺寸，对整体结构杆件的截面采用循环校核、递减尺寸，并对轻钢门式桁架结构进行优化设计，分析了优化结构在3种荷载工况组合条件下的整体刚度、强度及稳定性等力学性能的变化，给出了改进前后与优化前后结构的力学特性对比。

ZhuWenyu implemented the above two algorithms on a PC, testing 3640471 with AKSalgorithm and 4295884871 with the first AKS-Bernstein algorithm in about 2478.94hours and 28.35 hours respectively. She concluded that it's almost impossible tojudge the primality of a given integer directly with AKS algorithm, and testifiedthat the first AKS-Bernstein algorithm improves the AKS algorithm, but it's notyet suitable for use in practice, either.

朱文余在微机同禧3206c/850上用C语言实现了AKS算法及上述改进，前一算法对3640471进行测试约需2478.94小时，而后者对4295884871进行测试约需28.35小时，从而指出在实际运用中直接利用AKS算法进行素性测定几乎不可能，而AKS-Bernstein第一算法比AKS算法有一些改进，但仍不实用。

This paper describes an improved Scorecard Model which has much reference value and can be widely applied to various industries.

并在此基础上对计分卡绩效考核模型进行了改进，改进的计分卡绩效考核模型在很多行业有较大的应用和参考价值。

Use the mew accelerate function of OpenGL to accelerate the units display. Have adopted the three dimension graphics and OpenGL's technology, it makes use of Stencil test to carry on cutting operation, which reduces complexity of programming and has raised the speed and efficiency of displaying.

在后处理过程中，引进了DSI插值方法，改进了以往等值线插值，提高了算法速度和效率，满足了实时性要求，在扫描线算法的基础上，引进了OpenGL插值方法，改进了云图实现方法，提高了图形显示精度，在动画格式上，我们可以根据自己需要实现不同精度的不同压缩格式动画文件，提高了后处理显示应用场合，改变了以往动画格式单一的形式。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。