Boiti－Leon－Manna－Pempinelli方程的Painleve性质Backlund变换、共形不变性和新的2＋1维Sinh－Gordon方程

首先利用１＋１维ＫｄＶ方程的奇性流形方程的共形不变性，重新给出了１＋１维的ｓｉｎｈ－Ｇｏｒｄｏｎ万程。利用相同的思想万法，证明了ＢＬＭＰ万程的Ｐａｉｎｌｅｖé性质，给出ＢＬＭＰ方程的Ｂａｃｋｌｕｎｄ变换的同时，利用ＢＬＭＰ方程的Ｓｃｈｗａｒｔｚ形式的共形不变性，得到了一个新的２＋１维可积ｓｈＧ方程。     

Does movement toward better environments always benefit a population?

We study the effects of advection along environmental gradients on logistic reaction-diffusion models for population growth. The local population growth rate is assumed to be spatially inhomogeneous, and the advection is taken to be a multiple of the gradient of the local population growth rate. It is also assumed that the boundary acts as a reflecting barrier to the population. We show that the effects of such advection depend crucially on the shape of the habitat of the population: if the habitat is convex, the movement in the direction of the gradient of the growth rate is always beneficial to the population, while such advection could be harmful for certain non-convex habitats.     

受激拉曼散射中的二阶量子关联

利用全量子理论和多模受激拉曼散射模型，研究了拉曼放大中，考虑泵浦光耗散时，斯托克斯光和泵浦光二阶量子关联函数随相互作用距离变化的特性，在不计及色散的影响时，斯托克斯光和泵浦光的二阶量子关联函数的变化主要取决于输入斯托克斯光和泵浦光的光强比，在极限情况下，本文的计算结果与拉曼产生的计算结果和经典耦合波理论的计算结果相符合。     

自注入式可变短脉冲准分子激光器的理论分析

给出自注入式可变短脉冲准分子激光器运转和设计的理论基础，研究了其运行特征，设计和分析了一般商用器件实现运转要求具有的基本参数条件和实现可能。分析结果与国外最新实验结果具有较好的一致性，可用于指导器件的设计和实验，以及作为确定改善方向的基础。     

中孔分子筛MCM-41 的合成与表征

以硅酸钠、十六烷基三甲基溴化铵为原料, 研究了合成MCM -41 的具体条件, 并以XRD、IR、氮吸附、热分析进行了表征.讨论了可能的机理.实验表明产物先形成六方相后转为层状相.     

HYDROGENATION OF CO_2 OVER ULTRAFINECuO-ZnO-SiO_2 CATALYST-REACTION CONDITIONS AND MECHANISM

IntroductionAsoncofthemostabundantandcheapestcarbonsourccs,Co2u,ithsteadilyincreasingconcentrationintheatmospherenotonlyleadstothelossofcarbonsource,butalsocausesgrccnhouseeffects.Recently,Co2wastestedasafecdstockformcthanolproductionovcrdiffcrentcatalystsclse.'hcrell'21,butmostofthesecatalystswerebasedonthecombinationofcoppcrandzincandpreparedbycoprecipitation,ioncxchangcor'l3'4]Accordingtoextensivestudiesaboutsupports,SiO2wasoncoftheimpregnationl3'4]Accordingtoextensivestudiesaboutsupport…     

热脱附谱表征SmNtn03表面氧的吸附态

从SmMnO,的清洁表面上吸附Oz后的热脱附谱图中发现，气相氧不仅在SmMnO,表面吸附，而且也大量进入由于高温(820K)抽空而造成的晶格氧缺陷中.实验结果表明，O:在SmMnO，的表面吸附存在着两种化学吸附态，且均为二级吸附，即O}以离解方式吸附在SmMnOa的表面，同时对氧的热脱附谱采用脱附速率等温线法处理，结果得到这两种化学吸附态的平均脱附活化能分别为67. 0和93. 9k1 /mol，其中脱附活化能较大的那一种吸附态仅在较高温度下吸附时才出现，因而该吸附态应具有较大的吸附活化能.     

Properties of Optical Phase-Locked Loop Based on Four Wave Mixing in Semiconductor Laser Amplifiers

In this paper, the properties of the optical phase-locked loop(PLL) based on the four-wave mixing in the semiconductor laser amplifiers (SLAs) are discussed. The components that achieve the function of detecting the bit phase of the input optical signal are concerned and discussed in detail together as a function module named as the optical bit phase detector referred to the general electronic PLL. Therefore, most of the properties of the optical PLL can be analyzed by applying the general phase-locked theory. Here the stability of the optical PLL is discussed. It's shown that the variance of input signal power in the practical application will cause optical PLL system unstable because of its long loop delay. The influence on the output phase jitter of the optical PLL is also investigated.