改进的性能

Based on a series of signal process and noise source identification techniques, especially the major noise source identification methods, such as expurgation method, sound intensity analysis, spectrum analysis vibro-acoustic correlation analysis and so on, the pass-by noise control of SC7080A and SC6360B are studied in detail. By the roadway and dais experiments, the major noise and radiating parts are identified and some economical controlling methods are made. For the SC7080A, to control the emissing noise from the intake and shell vibration of air cleaner, a intake muffler is installed between the air cleaner and intake valve. Based on the theory of Helmholtz resonator, One three-parallel-connected resonant silencer is designed and trial-manufactured. For the SC6360B, the attenuation performance of exhaust muffler in high frequency region is improved. To reduce the vibration noise of shell part, the structure of oil sump tank, exhaust manifold shield and exhaust manifold shield are analyzed and improved. At the same time, some measures, such as sound absorption, sound insulation, are taken to reduce the noise of engine surface emissivity and a sound shield is designed.

本文首先综述了目前国内外汽车加速噪声控制的现状、主要方法和技术措施，在此基础上，结合SC7080A和SC6350B汽车的车外加速噪声水平及现状，综合运用分别运行法、声强法、频谱分析法、声振相干函数法等现代噪声源识别方法，对SC7080A和SC6360B汽车进行了准确详细的车外加速噪声源识别并提出了经济可行的控制方案，针对SC7080A，主要在空气滤清器和进气阀门之间的进气管道上加装进气消声器，抑制空气滤清器壳体表面和进气口两处的噪声辐射，根据Helmholtz共振腔原理设计了三腔并联旁支型共振消声器，并进行了工程化设计和试制；针对SC6360B，主要改善了排气消声器在高频段的消声性能，对罩壳类零件进行了结构改进，降低了其表面噪声的辐射，并对发动机舱进行了吸声、隔声处理，设计了发动机隔声罩。

In: Proceedings of the 1999 Congress on Evolutionary Computation, Piscataway, NJ: IEEE Press, 1999: 1958~1962.[9] Kennedy J. Small worlds and Mega-minds: effects of neighborhood topology on particle swarm performance. In: Proceedings Congress on Evolutionary Computation, Piscataway, NJ: IEEE Press, 1999: 1931~1938.[10] Peram T, Veeramachaneni K, Mohan C K. Fitness-distance-ratio based particle swarm optimization.

近来性能较为显著的基于PSO算法的改进算法有Thanmaya Peram[10]等人于2003年提出的基于粒子群优化的适应值-距离-比例算法(Fitness-Distance-Ratio based Particle Swarm Optimization， FDR-PSO)，在此算法中每个粒子根据一定的适应值-距离-比例原则，向附近具有较好适应值的多个粒子进行不同程度的靠近，而不仅仅只向当前所发现的最好粒子靠近。

For the problem that the suppression of co-channel interference and suppression of noise can't be balanced in signal-to-jamming and noise ratio maximization method for the linear precoding of multiuser multiple-input multiple-output downlink systems, an improved scheme that the term of noise variance is modified as a piecewise linear function is proposed, in which the balance between suppression of co-channel interference and suppression of noise can still be maintained even when the noise variance is a small value through piecewise modifying the term of noise variance, and thus the bit error rate and capacity of the systems are further improved.

针对多用户多输入多输出系统下行链路线性预编码的信干噪比最大化方法中，共信道干扰抑制和噪声抑制不能有效平衡的问题，提出将其中的噪声方差项修正为以噪声方差为变量的分段线性函数的改进方案。该方案通过对噪声方差项的分段修正，在噪声方差的值较小时依然能够保持共信道干扰抑制和噪声抑制间的平衡，从而使系统的误比特率性能和容量得到进一步提高。

Through designing,counting and explaining the vacuum induced furnace,which used in the mixing test with protected glove-box, this paper expatiates design on the vacuum furnace structure specially used to investigate nuclear material's pyrometallurgy and chemistry performance,emphasizes on several essential point and design project of the mixing vacuum induced furnace relating with the moving parts of the glove-box. Thereby,It tries to offer a compact and applied reference case for the type of scientific research equipment designing and developing,and advise to improve certain deficiency in the actual application of induced furnace.

本文通过对配有防护手套箱的搅拌式试验用真空感应炉的设计、计算说明，阐述了用于核材料高温冶金及化学性能研究的专用真空感应炉的设计思路，重点叙述了搅拌式真空感应炉装置在手套箱内相关运动部件的几处设计要点及设计方案，从而试图为今后该类科研设备的设计研制，提供一个简洁实用的参考案例，同时对感应炉在实际应用中存在的不足也提出了改进意见。

Producted RF and CRF aerogels by process of sol-gel technics, dynamic-exchange, CO2 supercritical drying, and procedural increase in temperature carbonization methods, which have eximious capability and nanometer network structure; Systemic analysis various factors which effect gel course, such as ratio of reactants and the dosage of catalyst, and probed into the better experiments conditions(the concentration of resorcinol and formaldehyde is more than 2% and the value of R/C is between 50 and 300); During gel course , primary investigated the viscosity curve and particle size distribution of sol-solution, and analyzed the reason of catalyst dosage effects particle size of gel, and confirmed that the up-growth of gel follows the theory of " polymerize increase ".The experiment results indicated that ultrasonic with unvarying temperature disposal shortened gel time and optimized quality of gels, and the factors of ultrasonic effect gel reaction velocity were analyzed; Prepared organic aerogels using compounds of resorcin and hydroquinone substitute resorcinol reacts with formaldehyde the first time, and also optimized the proportion of resorcinol and hydroquinone (the proportion of hydroquinone in 10%～40%).

采用溶胶-凝胶工艺结合动态溶剂交换、CO2超临界流体干燥与程序升温碳化方法制备出性能优良、具有纳米网络结构的RF与CRF气凝胶；深入研究了反应物配比催化剂用量等条件对凝胶过程的影响，得到了较佳的RF凝胶制备条件(RF浓度应大于2%，R/C值取50～300)；初步研究了凝胶过程中的粘度、粒径变化情况，分析了催化剂用量影响凝胶中粒子尺度的原因，在实验上印证了凝胶生长遵循"聚增长"的理论；通过引入超声波改进了RF气凝胶的制备工艺，缩短了凝胶反应时间，提高了凝胶品质，并探讨了超声波促进RF凝胶反应作用的原因；首次用对苯二酚与间苯二酚复配制备了混合有机气凝胶，优化出复配比(对苯二酚含量为10%～40%)。2。

So the braking prescription should be performed strictly, furthermore, the sudden and urgent braking should be avoided to the best of our abilities.In the end, the thermal fatigue lives were evaluated by the finite element method. It was proved that the thermal fatigue life of improved steel (ZG35CrMoRE) was higher than that of the formers. It was also found that the quantitative evaluations of the thermal fatigue lives of brake disc were acquirable, by putting the equivalent plastic strain, which was analyzed with finite element methods, and the material mechanical property parameters into the formula of Manson-Coffon to calculate its lives. Therefore, theoretical method can be provided to develop new brake disc steel and to prolong its lives.

为了进一步提高刹车鼓的使用寿命，对新试制的钢种进行了热疲劳寿命评估，验证了改进后的钢种在相同的使用工况下具有更高的热疲劳寿命；评估结果还表明利用有限元数值分析计算相应的等效塑性应变，结合材料力学性能参数，代入Manson-Coffin热疲劳寿命公式可以对刹车鼓的热疲劳寿命做出定量评估，从而为刹车鼓用钢的研制和刹车鼓寿命的提高提供了理论依据。

The recent advances in the first principles calculations and atomistic simulations further help us in understanding atomic bonding, dislocation configuration and alloying effects in intermetallics which has led to the development of nickel, iron and titanium aluminide alloys with improved mechanical and metallurgical properties for structural use.

第一原理计算和原子结构模拟的新近研究结果能进一步帮助了解金属间化合物的原子结合键性质、位错组态和合金元素的作用。对基本问题的更好了解导致镍、铁和钛的铝化物金属间化合物合金的力学和冶金性能的改进，更接近了结构方面应用的要求。

This paper introduced the working principle and kinematic regulation of intermittent sheet transfer mechanism available,expounded their advantages and disadvantages,and provided out that the tendency of this mechanism is the finer dynamic performance,higher precise and compacter.

介绍了现有间歇递纸机构的工作原理和运动特性，阐明了各自的优缺点；指出间歇递纸机构的发展趋势是对动力学性能好、传递精度高、结构紧凑的新型组合机构的研发；提出专用曲线槽轮-不完全齿轮递纸机构，通过与现有机构的分析对比，证明了新机构的优点，为间歇递纸机构的改进设计提供了新的思路。

Therefore, we selected the 5 genes, as well as SMTN gene related to human cardiovascular diseases, for chromosomal mapping, CDS cloning and analysis, spatio-temporal distribution, mutation riddling, and association analysis with production traits of 3 porcine populations. We expect to know the structure and function of these 6 genes primarily, and supply data for porcine marker assistant selection of improving meat production.

因此，本研究选择NADH呼吸链相关基因，以及与人类心血管疾病相关的SMTN基因，以猪的骨骼肌为研究对象，用人×仓鼠体细胞杂种克隆板进行6个基因的染色体定位、CDS克隆和序列分析、用半定量RT-PCR进行时空表达谱分析、进行突变位点的筛选、并利用3个猪群的产肉性状资料进行基因型与性状的关联分析，以期初步了解这些基因的结构和功能，并为改进猪产肉性能的标记辅助选择提供资料。

Basic operators of color image morphology are established.The result of the experiment demonstrates that the color vector order has good property.The algorithm of color image morphology based on this order can better keep the peripheral information and hue of the image and has the strong point of unnecessity of exchanging between different color spaces.

实验结果表明提出的颜色向量序性能良好，建立在该向量序上的彩色图像形态学算法能够较好的保持图像的边缘信息和色调，并且亮度均匀，与原图像相比对比度均匀增强，重构开算法的实验结果比原文献中方法有了较大的改进；具有不需要在不同的颜色空间之间转换的优点。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。