Two ancient rounds of polyploidy in rice genome

An ancient genome duplication (PPP1) that predates divergence ofthe cereals has recently been recognized. We report here another potentially older large-scale duplication (PPP2) event that predates monocot-dicot divergence in the genome of rice(Oryza saliva L.), as inferred from the age distribution of pairs of duplicate genes based on recent genome data for rice. Our results suggest that paleopolyploidy was widespread and played an important role in the evolution of rice.     

双CPU在控制系统中的应用

从最简单的硬件和软件设计角度分析双CPU在多I／O应用系统中的实施方法，讨论了双CPU系统的可靠性和灵活性。     

局域弯曲液面的光学特性分析

研究了强度均匀分布的平行光束照射局域上（下）弯曲液面时，其反射光场及该反射光场经透镜后的透射光场的分布特点，发现上弯曲液面的反射光场为椭圆形暗场，下弯曲液面的反射光场为星形亮斑。而它们的透射光场恰好类似于对方的反射光场。对这些特点的形成进行了讨论，同时对上弯曲液面的反射光场进行了计算。     

Distribution Regularity of Muzzle Shock-Wave Inside Protective Cover

The injury of gunners caused by muzzle shock-wave has always been a great problem when firing inside the protective cover. The distribution regularity and personnel injury from the muzzle blast-wave were investigated by both test and numerical simulation. Through the inside firing test, the changes of overpressure and noise have been measured at different measuring points in the thin-wall cover structure with different open widths and shallow covering thickness. The distribution regularity of muzzle shock-wave with different firing port widths is calculated by ANSYS/LSDYNA software. The overpressure distribution curves of muzzle shock-wave inside the structure can be obtained by comparing the test results with the numerical results. Then, the influence of open width and shallow covering thickness is proposed to give a reference to the protective design under the condition of the inside firing with the same cannon caliber.     

日本对外直接投资的产业流向启示

日本先保证国内资源、能源的稳定供应,对相关的产业部门进行投资,再从比较优势的行业依次对外进行扩散,使本国的“边际产业”依次向外转移。“日本式”的这种产业流向在当前我国实施QDII制度条件下对外投资的产业选择有着重要的启示。     

我国信贷传导渠道受阻的原因分析及对策建议

造成信贷传导渠道日趋萎缩的主要原因有二：一是巨大存差的存在；二是资金分布的结构性矛盾。要从根本上解决该问题，政府相关部门、中央银行和商业银行应相互协调，促使信贷传导渠道的疏通。     

半挂车轴荷分配优化设计

结合实际设计工作，总结出半挂车轴荷分配的一种优化设计方法，并建立起相应的数学模型。     

指数分布下加速寿命试验的统计分析

在产品寿命服从双参数指数分布的情形下,研究定数截尾恒加速寿命试验的可靠性统计分析问题,给出了正常应力水平下产品可靠性指标的估计方法.     

敦煌古籍流失及其整理的研究

在对敦煌古籍流失进行简述的基础上，着重论述了它的历史价值及其分布现状，并对近百年来的敦煌古籍的收集整理成果作了概括和总结。     

关于收入差距及其调节的几个认识问题

为了加强对我国收入差距的有效调节,必须明辨以下问题:怎样估量和对待当前我国收入差距;怎样认识和把握公平与效率的关系;怎样理解初次分配与再分配的调节功能。