性能良好的

In order to eliminate the influence caused by the nonminimum phase characteristic of a common Boost DC／DC converter, Viswanathan K has proposed a novel tristate Boost DC／DC converter. For enhancing performance, the statespace averaging model of this converter was first presented in this paper. Due to the nonlinear nature in this model, an inputoutput feedback linearization technique was adopted, and a complete controllable linear system was obtained. Then a statefeedback control strategy was designed based on this linear system. Simulation results show that the proposed control strategy can assure constant output voltage in a wide range, so as to realize the stability of the system during large fluctuation of power supply and load disturbance. Good dynamic performance can also be achieved.

针对 Viswanathan K为消除普通BOOST DC／DC变换器的非最小相位特性而提出的三态Boost DC／DC变换器，为进一步提高这种电路拓扑的性能，在建立了变换器状态空间平均模型的基础上，针对其多变量、非线性特点，采用输入输出线性化将其转化为一个完全可控的线性系统，在此基础上应用现有成熟的线性控制策略进行了控制系统的设计，并且采用MATLAB进行仿真验证，结果表明：这种非线性控制策略可以确保输出电压在大范围内恒定可调，且即使存在大范围扰动(输入电压和负载变化均较大)的情况下，系统也可以确保稳定性和良好的动态性能。

Research on the effects of different operating parameters of the new OSB blender on the performance of OSB made by blended particle was conducted.

研究新型定向刨花板拌胶机的不同工作参数对拌胶刨花压制成的OSB板子性能的影响，试验结果表明：拌胶机滚筒的装载量以刨花占滚筒容积15%为宜，最佳转速为13 r.min-1，采用抄板气流流态控制和针滚机械干涉方法，均能使刨花处于良好的受胶状态，胶液均匀分布，提高板子的力学性能。

By means of full and accurate investigation of historic and archaeological data, and combining with the survey of the relict structures of ancient Chinese buildings, a lot of investigations has been done, the origins , development, evolution of timber buildings in Chinese various historic times are studied with principle, types, constructions and functions of the structure.

通过对翔实历史与考古资料的调查，并结合于中国古建筑遗构的勘测，进行了许多有关这类结构的起源、发展和演变方面的研究工作，结果表明：(1)木构架具有相当好的抗震性能，由于这类木造结构的材料具有良好的弹塑性性能、以及榫卯节点的柔性连接，以致在地震过程中，大量的地震动能量被消耗掉。

The problem from sodium tripolyphosphate,4A zeolite,sodium metasilicate and phosphorous prohibition was summarized and the various performances and effect of δ-layered crystal disodium silicate as detergent were analyzed.

分析了现用助洗剂三聚磷酸钠、4A沸石、偏硅酸钠存在的问题及禁磷的重要性，重点论述了δ-层状结晶二硅酸钠用作助洗剂的各种性能及效果，认为δ-层状结晶二硅酸钠是一种良好的无磷助洗剂，它具有其他助洗剂所不具备的优良性能；对δ-层状结晶二硅酸钠的制备工艺作了简要介绍，并作了市场及在国内工业化生产的可性行分析。

The results show that a MgSnO3·H2O conversion film is formed by treatment in the stannate solution at 90℃, and the immersion test and potentiodynamic polarization show that the corrosion resistance of the AZ91D alloy is improved to some extent.

结果表明：锡酸盐转化处理后合金表面形成了以MgSnO3·H2O为主要成分的转化膜，可对合金起到一定的防护作用；转化膜由细小的球形颗粒密积而成，颗粒之间存在间隙，它可以为化学镀镍的前处理过程提供良好的吸附条件；转化膜上的化学镀镍层组织致密、无缺陷， MgSnO3·H2O转化膜在镀镍层与基体之间起到过渡作用，镀层的磷含量达到9%，与基体结合良好；在3.5% NaCl (pH=7)溶液中的动电位极化测试表明，镀镍以后的合金在阳极极化过程中发生了明显的钝化，耐腐蚀性能进一步提高，对基体起到了较好的防护作用。

Theoretical analysis and testing results demonstrated that Viton, a new substitute of the former plasticizer, could noticeably improve its performances, which has been proved as the important improvements of the mixture. Due to the favorable thermochemistry performance, dicyandiamide can act as a good combustion-rate regulator. The addition of antistatic agent can desirably increase the antistatic capability of the mixture, and the testing results showed that the performance of the improved mixture was excellent.

理论分析和测试结果均表明了以氟橡胶取代耐水点火药中原粘合剂将使药剂的各项性能有明显的改善，是耐水点火药改进的重要方面；双氰胺具有良好的热化学特性，作为耐水点火药改进中的燃烧速度调节剂具有很好的调速效果；抗静电剂的加入，进一步提高了药剂的抗静电能力，测试分析表明改进后药剂的性能更加优异。

At the same time, some defects are pointed out: present fabrics are not properly applied, and most of looms can't produce woven perform whose property is similar in different directions. Their shearing strength are lower, utilization of mechanical properties are also smaller;Although three-dimensional braided composites is of excellent integrated structure, normal braided fiber is traveled from internal to external surface, which is passed through braider and becomes three-dimensional structure. If the external surface is cut or rubbed , it's possible for the fiber to break down. In addition , the shape of perform is easily changed after it's finished . To deal with respective shortcomings and highlight their own advantages, we're searching a new weaving method which is the combination between weaving and braiding .

但它们各自也具有许多缺点：目前机织物适应性不够，大多数织机还不能加工三维各向同性的机制预型件，材料剪切性能较低，力学性能利用率低；三维编织复合材料虽然具有良好的结构整体性，但常用的编织都是纤维从内表面穿到外表面，即穿过编织件的断面成三维结构，用这种方法制成的结构，如果外表面受到摩擦或切割损伤，就有可能导致结构的解体，此外编织结构的织物易变形，所以我们需要考虑一种新的结构，能同时发挥各自优势，又能同时克服二者缺点，这就是机织与编织结构相结合的方法。

On curing, the -NCH〓OH groups of PNMA film would condense with each other to form a network of PNMA in which the PA molecular long chains were be"tightened"in bundles, or be confined in the meshes of the networks. 2. During the developing process of the low-temperature curable, non-formaldehyde PA latices, the monomers were chosen based on the organic/inorganic ratios, and the co-polymerization reactivity ratios. The effects of crosslinking monomer A and B were also compared.

从物质的有机性/无机性值，以及多元单体发生共聚的条件出发，通过比较交联单体A与B的性能，发现采用交联单体A的胶乳的性能良好，确定了一个由软、硬及交联单体A等多种单体组成的混合体系在阴/非离子组成的复合乳化体系中进行乳液聚合制备所要求的低温无甲醛PA胶乳的配方。

The result proves that not only the grinding wheel's cost is lower, but also the effect is better than ordinary wheel in hardness, strength density and metallograph. The wheel has good abilitg of keeping grinding material and good grinding property. It can satisfy reguest of ELID grinding technology for wheel's selectrolytic and forming film. It is an ideal, practical and special grinding wheel of ELID grinding.

实际应用结果表明，该砂轮成本低、效果好，在硬度、强度、密度、组织等物理性能方面较商品砂轮有较大提高，并具有很好的把持磨料的能力和良好的磨削性能，充分满足ELID磨削技术对砂轮电解生膜的要求，是一种较为理想的实用的ELID磨削专用砂轮。

The results show that myristic acid radical anion of precursor Zn0.78 Al0.2220.22c13h27COO0.81H2O can be almost completely replaced by complex anion [La(TiW11 O39)2]^3- under special controlled reaction conditions.

结果表明，该产物中[La(TiW11O39)2](上标 13-)配阴离子沿其长轴垂直于层板的方向分布于水滑石层板间，产物有规整的层状结构、大的层间距(d003=3.29nm)、良好的结晶度和热稳定性，产物对二甘醇与苯甲酸的酯化反应、二甘醇的脱水环化反应和苯甲醛的氧化反应具有良好的催化性能。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。