无粘性Burgers方程黎曼问题光滑近似解的高阶衰减估计

通过运用特征线法，引入一些非线性函数变换，讨论了无粘性Burgers方程如下柯西问题{w1＋wwx=0，w（x，0）=w0（x）=1/2（w＋＋w-）＋w~Kq∫0^4xdy/（1＋y^2）^q，解的L^p衰减估计，并给出了w（x，t）的高阶L^p衰减估计的证明．[编者按]     

Theoretical model of particle orientation distribution function in a cylindrical particle suspension subject to turbulent shear flow

The equation for the orientation probability function of slender cylindrical particles suspended in planar turbulent flows was investigated. After ensemble averaging, the equations for the mean and fluctuating probability function were derived. The equation for the fluctuating probability function appearing in the equation of mean probability function was solved by using the method of characteristics analysis. The orientational dispersion terms due to the random motion of cylindrical particles in the equation of mean probability function are related to the mean probability function and the Lagrangian fluid velocity correlations. The evolution of the mean probability function was described by a modified orientation?space?convection equation, where the dispersion terms account for the randomizing effect of the turbulence.     

Methods and Effects of Hongshan Cock Spermatozoa Cryopreservation

0Introduction Afterthecarryingoutofopen doorpolicies,espe ciallyinthelatesttenyears,livestockandpoul try’sraisingbusinessdevelopedveryfastinChina,whichhelpeduscompletelyshrugofftheembarrassed situationofsevereshortagesofanimalproteininthepastlongperiodandgreatlyexcitedandencouraged us.Meanwhilewemustclearlyrealizethepotentialdangersbehindthepresentprosperities.Ourbreeds arebecominglessandless,manynativebreedswithlowperformancedisappearedcompletely,thetendency oftheirextinctionisincreasinginth…     

抽水蓄能电站优化运行方式的混合遗传算法

在建立抽水蓄能电站优化运行方式计算模型的基础上，将遗传算法与领域问题的算法相结合：选择机组运行状态作为编码变量，使机组的运行状态与二进制遗传编码具有简洁对应关系，采用符合问题本身特点的基因面式杂交算子和改造的变异算子，使遗传操作更适应问题的求解；根据领域问题的性质及算法求解承担系统基荷的机组运行方式，使问题的规模得到有效压缩，应用领域问题求解的等微增率原理计算各个体因子所对应的运行机组间最优负荷分配方案，并以此计算了个体适应值，由于在遗传编码设计，遗传操作改造，问题规律压缩以及适应值计算几个方面融合了问题所涉及的领域知识，提高了算法的计算效率和全局搜索能力，形成一种适合于求解复杂约束条件下抽水蓄能电站优化运行方式的混合遗传算法。     

培养料和温度对茶薪菇生长发育的影响

在实验室内，以PDA为培养基接种茶薪菇，置于梯度为5℃、10℃、15℃、18℃、20℃、25℃、28℃、30℃、32℃、33℃、35℃、36℃的恒温箱中，培养观察茶薪菇菌丝生长。用配方I：棉籽壳77％、麦麸20％、石膏粉2％、蔗糖1％；配方Ⅱ：茶支屑77％、麦麸20％、石膏粉2％、蔗糖1％；配方Ⅲ（对照）：阔叶树木屑77％、麦麸20％、石膏粉2％、蔗糖1％，作为培养料接种茶薪菇，培养观察茶薪菇的菌丝生长和产量。以配方I为培养料，含水量设55％、60％、65％和70％，菌丝生长熟后置于温度为15℃、18℃、20℃、24℃、26℃培养室内培养，分别观察含水量和室内温度对子实体的影响。结果表明，茶薪菇菌丝生长比较适合的温度为18－28℃，子实体发育较适温度为18－24℃，培养料含水量以65％较好，配方I和配方Ⅱ适合茶薪菇生长，产量也较高，生物学效率达73．5％和65．6％。     

Microelement analysis of source of raw materials of terracotta warriors and horses of Qin’s Mausoleum in pits No. 1 and No. 2

In order to search for sources of the raw material of the Qin’s terracotta warriors and horses, we selected 20 samples of pottery warriors and pottery horses of the Qin’s Mausoleum from pit No. 1, 19 samples of pottery warriors and brick from pit No. 2, 20 samples of clays near the Qin’s Mausoleum and 2 samples of Yaozhou porcelain bodies. The 32 kinds of element content of each sample were measured by neutron activation analysis (NAA). These data were analyzed by fuzzy cluster analysis, the trend cluster analysis diagram was obtained. The results showed that samples of terracotta warriors and horses from pits No.1 and No. 2 were closely related to the loam layer near Qin’s Mausoleum, but their relations with the loess layers were not so close, and they were out of all relation to Yaozhou porcelain bodies. Thus, it could be deduced that the Li Mountain clay may be considered as the original place of the raw materials of the terracotta warriors and horses, the kiln sites might be located nearby the Qin’s Mausoleum.     

波分复用器件自聚焦透镜耦合系统的优化设计

利用光纤矩阵方法和高斯光学的耦合损耗理论，对波分复用器件的自聚焦透镜耦合系统进行了分析，得出了一种优化设计耦合系统的分析和计算方法。结合计算结果的曲线，分析了耦合系统中透镜长度对耦合损耗的影响，提出了通过调整入射单模光纤与自聚集透镜粘接的角度来减小耦合损耗的新方法。     

高功率短脉冲激光照射下生物组织内的热传导研究

采用响应时间为1μs的超小型薄膜铂热电阻温度计及日本YOKOGAWA DL2700高速数字示波器，对微秒量级脉冲激光照射下离体动物组织内的热传导进行了实验研究，结果发现：在激光脉宽较短时，组织内出现了非傅时叶导热现象，脉宽越短，组织厚度越薄，非傅时叶导热特征越明显，功率密度和光斑直径只影响温度上升的高低，对是否会出现非傅里叶导热没有影响。     

一类与单种群模型有关的非线性泛函微分方程解的振荡性

给出了一类一阶非线性泛函微分方程解的振荡性的充分性判据,并用例子说明了用线性化方程的振荡性判据去给出非线性方程的振荡性的判据有时是错误的。同时,得到了时滞的单种群方程的解的振荡性的一些充分性判据。     

苹果幼树主干环剥与涂施多效唑对生长,花芽分化和座果的影响

红富士苹果幼树主干环割三道或环剥皮0.5cm后,加涂不浓度多效唑溶液,均明显抑制了新梢和叶面积的生长,增加了短果枝和花芽数量,显著提高了单株产量,果实硬度约有增加,但因结果过多,品质下降,故应注意采用疏花疏果措施,保证增产增收。施用浓度以4000PPm效果最好。