狭矩形截面梁弹性力学问题的奇异函数法研究

阐述了奇异函数在弹性力学问题中半逆解法思路和应用于求解位移函数型平面微分方程问题中的基本方法,并以狭矩形截面梁为例进行了推算,计算结果有效。     

半导体激光器驱动电路设计

半导体激光驱动电路是激光引信的重要组成部分.根据半导体激光器特点,指出设计驱动电路时应当注意的问题,并设计了一款低功耗、小体积的驱动电路.通过仿真和试验证明该电路能够满足设计需求,对类似电路设计有很好的借鉴作用.     

窄河道型油田注水见效时间与见效类型研究

渤海地区窄河道型油田多采用注水方式进行开发,但其注水见效程度存在较大差异。应用渗流力学理论,推导出了窄河道型油田注水见效时间公式,并应用现场实例进行了验证。结果表明与实际情况相符合。同时根据不同的注水见效特征,将窄河道型油田注水见效类型划分为三类。研究为预测窄河道型油田注水见效提供了一种重要手段。     

微膜蒸发通道中液氮的热虹吸沸腾传热特性

空分装置中主冷凝蒸发器的自由液面常发生波动,不利于空分装置的可靠运行。为了解这种变工况下换热器传热能的变化情况,文中研究了不同间隙尺寸下,浸没深度对弦月形缝微膜蒸发通道内液氮的热虹吸沸换热特性的影响,并设计了一种补液措施。     

模糊性的成因与模糊性数学

模糊性是在人类认识客观世界的思维反映中形成的,它分为狭义模糊性、一般模糊性、广义模糊性和泛模糊性,并形成或将要形成相应的数学方法和数学问题。     

语境在翻译中的作用

语境又称上下文,它指各语言单位的语言环境。它有广义和狭义之分。狭义上下文指句子的范围内,该单位的一些语言单位;广义上下文指该单位的超出句子范围的语言环境。正确理解语境,可以解决翻译中语言多义性的问题,也可以帮助理解具体语言环境下语言的具体意义。     

渤海窄条带状油田水平井产能研究

目前,国内外许多学者对水平井产能作了大量的研究,然而,利用前人推导的水平井产能公式计算窄条状油田的水平井产能误差较大,无法合理预测该类型油田的水平井产能。利用镜像反映和势叠加原理等渗流理论,推导了窄条状油田的水平井产能公式,并与现场实际产量进行对比,相对误差小于10%。本文的结果对水平井在窄条状型油田开发中的实际应用提供了理论基础。     

Genetic analysis and gene mapping of a narrow leaf mutant in rice ( Oryza sativa L.)

A narrow leaf mutant was obtained after T-DNA transformation conducted on a rice variety Zhonghua 11. Several abnormal morphological characteristics, including semi-dwarf, delayed flowering time, narrow and inward rolling leaves, and lower seed-setting, were observed. The rate of net photosynthesis (under saturate light) of flag leaves in the mutant was significantly lower than that of the wild type. Moreover, the leaf transpiration rate and stomatal conductance in the mutant flag leaf were lower than those of the wild type at the grain filling stage. It was found that the mutant phenotype was not caused by the T-DNA insertion. Genetic analysis showed that the mutant was controlled by a single recessive gene, designated as nal3(t). A genetic linkage map was constructed using a large F₂ mapping population derived from a cross between nal3(t) and an indica variety Longtefu B with 6 polymorphic markers on chromosome 12 identified from 366 SSR markers by the BAS method. Gene nal3(t) was mapped between the markers RM7018 and RM3331. Fine mapping of nal3(t) locus was conducted with 22 newly developed STS markers based on the sequence diversity around the region harboring nal3(t) between Nipponbare and 93–11, and nal3(t) was finally mapped to a 136-kb region between the STS markers NS10 and RH12-8. Supported by National High Technology Research and Development Program of China (863 Program) (Grant No. 2006AA10A102), National Natural Science Foundation of China (Grant No. 30600349) and Natural Science Foundation of Zhejiang Province (Grant No. Y306149)     

面向窄带环境的异地同步协同设计方法

采用多代理结构和对操作系统的内封装，将应用程序的操作命令提取出来，在异地系统间共享。讨论了建立面向窄带环境的异地同步协同设计支撑平台的关键技术，在体系结构上提出了一个基于操作信息共享的C／S结构。其中服务器上采用的协同管理方式和流量调节技术有效地保证了窄带环境的实施；客户机端的事件驱动与响应机制则严格实现了异地同步协作。按照这种思想建立的操作平台能够支持在地理上分布的工作团队通过低带宽的Internet，安全、实时地进行基于三维图形的异地协同工作。     

小波包变换算法抑制直扩通信系统窄带干扰

利用多进制小波包算法的良好光滑性、线性相位、紧支性等特点,并结合传统小波包分解树及滤波器,对数据进行多进制小波包分解,有效地抑制窄带干扰．分析和仿真结果表明,基于小波包算法的窄带干扰抑制的方法在性能上更为优越,并具有优异的误比特率性能．