基于TCP的拥塞控制策略及改进算法

从性能上具有互补性的STCP协议和CUBIC协议找到契合点,然后在性能较优的CUBIC基础上提出一个新的改进算法SCUBIC,并用实验证明其具有比CUBIC更好的稳定性、可扩展性、TCP友好性和RTT公平性.     

半成品总压缩率对成品钢丝力学性能的影响

在生产高性能钢丝时,采用常规拉拔工艺时断丝严重,产品韧性较差,从而严重地制约着产品的合格率。采用加大半成品的总压缩率的方法,可以提高半成品热处理后的强度,从而可以减小成品拉拔的总压缩率,这样,有利于保证成品的强度和韧性。     

人民币汇率变动对中国贸易结构的影响

在汇率变动与贸易结构机理分析的基础上,就新人民币汇率机制形成前后两阶段对中国贸易结构(商品结构与贸易伙伴结构)的影响进行了对比分析。     

欧元诞生以来对美元汇率的走势及分析

自1999年1月欧元问世以来,欧元对美元的汇率总体走势呈U形波动。若将欧元诞生至今的这6年作为一个周期来观察,欧元对美元汇率总体走高。但欧元升值却不是因为欧元区经济形势向好,而是美元汇率疲弱的结果。造成欧元对美元汇率波动的原因是多样化的:一是美国的巨额双赤字;二是欧美经济基本面的重大差异,即欧盟的“增长赤字”;三是美国和欧盟的政策因素;四是从制度层面上看,以美元霸权为基础的国际货币体系具有内生的不稳定性。     

宏观经济系统的鲁棒控制

考虑参数不确定性对一类宏观经济系统的影响，研究了宏观经济系统的鲁棒控制问题，给出系统的鲁棒控制律以及经济系统鲁棒稳定的条件,鲁棒控制律保证了宏观经济系统稳定的运行，同时可以使国民产总值在短时间内跟踪总需求,通过仿真验证了该算法的有效性．     

Scale Factor Determination of Micro-Machined Angular Rate Sensors Without a Turntable

Introduction Micro-machined angular rate sensors or gyroscopes are used to measure the angular velocity of a moving ob- ject without an external reference. Low cost, high pre- cision gyroscopes find a large market in consumer products, automobiles, medica…     

Passive Control Reinforced Concrete Frame Mechanism with High Strength Reinforcements and Its Potential Benefits Against Earthquakes

Introduction In most reinforced concrete (RC) structures, a large stiffness is needed in order to limit structural deforma- tion for service load conditions. In seismic resistant structures, however, the energy dissipation demands are imposed and inelasti…     

Shape controllable preparations of PbS nanocrystals using cysteine as the precursor of S^2- ions

Flowerlike, spherical and cubic PbS nanoparticles have been successfully synthesized by refluxing cysteine and lead nitrate in an alkaline solu- tion. The influences of the cysteine to Pb2 molar ratio, the pH value of the reaction mixture as well as the refluxing time on the shape of PbS nanoparticles were investigated. Detailed experimental results demonstrated that a higher molar ratio of cysteine to Pb2 (5.2:1) and shorter refluxing time favor the for- mation of flowerlike PbS nanoparticles at pH 9.0. While lower pH value (8.0) favors the formation of spherical PbS nanoparticles, and higher pH value (10.0), however, favors the formation of cubic PbS nanoparticles. The mechanism for the shape control of PbS nanoparticles is discussed.     

Study on the effect of highway construction on photosynthetic rate of roadsides plant in Longitudinal Range-Gorge Region

A case study was conducted on Dabao （from Dali city to Baoshan city） and Sixiao （from Simao city to Xiaomengyang town） highways in Longitudinal Range-Gorge Region to investigate the effect of highway construction on photosynthetic rate of roadsides plants. The dominant species in the plant communities were selected to measure the variation of their photosynthetic rate with the distance to the highway, so as to analyze the effect of highway construction on photosynthesis and growth of roadside plants by using mathematic methods including contrast analysis, regress analysis and so on. Results indicate： （1） Highway construction reduced the plant photosynthetic rate of the arbor and crop, and improved the plant photosynthetic rate of the shrub and herbage; （2） highway construction directly affected the plant photosynthetic rate through changing the structure of plant community and living state of plant, and indirectly affected the plant photosynthetic rate through changing its environmental factors; （3） the location and topography of road are also important factors affecting plant photosynthetic rate on roadsides, the influencing incidence and intensity on plant photosynthetic rate under different topographies caused by the two selected highways were obviously different.     

一类非自衡对象的两自由度内模控制

针对常规一自由度内模控制在非自衡对象中应用的不足,提出了一种基于互质分解的两自由度内模控制器设计方法,并采用H2优化改善了系统的动态性能.一类非自衡二阶非最小相位过程的仿真结果表明,这种方法可使系统同时具备良好的鲁棒特性和干扰抑制特性.