Introducing antisense <Emphasis Type="Italic">waxy</Emphasis> gene into rice seeds reduces grain amylose contents using a safe transgenic technique

Rice (Oryza sativa L.) eating quality is one of themost important traits. Amylose content (AC) in rice en-dosperm is a major index affecting rice eating quality[1,2].It has a negative correlation with gel consistency of rice[3].Based on amylose content, r…     

半鞅积分方程解的存在唯一性

本文在严加安［１］的基础上，讨论半鞅积分方程 Ｘ＝Φ（Ｘ）＋Ｆ（Ｘ）．Ｍ解的存在唯一性．我们所获得的存在唯一性定理，与［１］中定理１３．１３相比较，不要求Ｆ、Φ满足Ｌｉｐｓｃｈｉｔｚ连续条件，而仅要求它们满足局部Ｌｉｐｓｃｈｉｔｚ连续条件，但我们附加了所谓的增长条件．我们还给出解过程估计式．此外，还给出Ｄｏｌｅａｎｓ－Ｄａｄｅ方程解的另一存在唯一性定理。     

并行离散事件仿真PDES 策略比较研究

并行离散事件仿真ＰＤＥＳ策略是当前国际离散系统仿真界最主要的研究领域之一。ＰＤＥＳ策略可分为四类：保守策略、乐观策略、混合策略和自适应策略。本文首先介绍了作为主要策略的保守策略与乐观策略,并对它们进行分析比较,而后介绍了以前两类策略为基础而形成的混合策略和自适应策略,接着分析了这四类策略存在的问题,最后提出应研究新的ＰＤＥＳ策略,以满足广泛的实际应用的需要。     

In-situ measurement of droplet size distribution by light scattering method

Inversion of droplet size distribution in two-phase flow from light scattering has been considered involved because it is in general reduced to the solution of Fredholm integral equation of the first kind that was always ill-posed. By using the Rosin-Rammler distributiona priori as the particulate size distribution model in the liquid-gas two-phase flow, a method via the solution of a two-parameter nonlinear programming problem to determine the droplet size distribution has been developed. A measurement system based on the technique is designed and applied in the shock test of blades of steam turbine. 100-hours continuous monitoring of the droplets in the liquid-gas two-phase flow of 8.0 Pa and 120 °C was performed and the details of the experiments are given out. It is shown that the technique is simple and efficient for in-situ real time measuring droplets in the liquid-gas two-phase flow. Ye Mao: born in 1973, Ph. D student     

八丁氧基2,3-萘酞菁钴(Ⅱ)配合物的光谱与电化学性质

测定了八丁氧基萘酞菁钴（Ⅱ）配合物（Ｃ４Ｈ９Ｏ）８ＮＰｃＣｏ（Ⅱ）在５种有机溶剂（ＤＭＳＯ、Ｐｙ、ＤＭＦ、ＣＨ２Ｃｌ２、Ｃ６Ｈ１２）中的电子吸收光谱和荧光光谱,以及在ＣＨ２Ｃｌ２中的循环伏安图,并研究了该化合物的光谱性质与其结构的关系．     

基于VXI总线模块化的雷达数字信号处理机

目的 对建立模块化雷达数字信号处理系统总线和本地总线进行研究。方法 将系统总线用于系统管理;本地总线用于高速数据流传输。结果 给出了基于ＶＸＩ总线的系统实现硬件配置方案及介绍已研制成的基于ＶＸＩ总线的高速雷达信号处理板,结论基于标准总线的模块化雷达数字信号处理系统避免了雷达处理机的重复研制,缩短了研制周期,降低了成本,提高了系统可靠性,增强了电磁兼容性能。     

水城赫章铅锌矿成矿的金属物源研究

黔西北各岩石地层单元铅锌背景含量,沉积旋回,水城赫章主要铅矿矿床的含矿层,近矿围岩,矿石矿物稀土元素和铅同素研究表明;玄武岩,８辉绿岩并非本区铅锌矿源岩（层）,铅主要来源于玄武岩下伏的沉积岩。成矿铅的成因主要是壳源铅,其次是造山带铅,深海沉积的凝缩段是Ｚｎ及部分ｐｂ的矿源层;玄武岩之下各沉积旋回下部的碎屑岩一般铅锌背景值高,也可能为成矿提供物源。     

斩波模式红外电视信号传递函数研究

推导出在计入相位滞后时,斩波模式红外电视信号传递函数的表达式．讨论读出时间对斩波模式运行特性的影响．为了获得最佳的信号传递函数,读出相角应选定在６０°～７０°范围内,这能提高高空间频率时的调制度．