遗传算法在智能控制中的应用

文章在介绍遗传算法的概念、实现方法的基础上，分析了遗传算法在神经网络及模糊控制中的应用。     

可见光诱导铌酸锂晶体畴反转

研究了在可见光诱导条件下的近化学计量比掺镁铌酸锂的反转电压与光强之间的关系.并实现了利用可见光对晶体畴反转进行可控操作和实时监测.发现晶体的反转电压随光强增大而下降,最大降幅达到70%左右.探寻了可见光诱导铌酸锂晶体畴反转的形成机制,认为光诱导晶体畴反转的主要原因是光激载流子迁移改变了晶体内部的局域电场,造成了晶体极化反转电压的降低.     

近化学计量比掺铁铌酸锂晶体光折变中心的研究

对不同锂铌比的掺铁铌酸锂晶体的光折变光栅的写入与擦除过程进行了研究,发现单中心模型已经不适用于近化学计量比掺铁铌酸锂晶体的光折变过程.通过对光折变光栅的擦除曲线的拟合发现,近化学计量比掺铁铌酸锂晶体的擦除过程为双指数过程,说明对于近化学计量比掺铁铌酸锂晶体光折变中心为两种.     

我国生物农药现状及发展趋势的探讨

简述生物农药特点、分类及发展历史；概述我国生物农药的发展现状、产业化品种、存在的问题及对策；预测我国生物农药的发展趋势、产业化前景。     

III族氮化物半导体材料

III族氮化物半导体材料（Al，In，Ca）N，（包括GaN、InN、A1N、InGaN、A1GaN和AllnGaN等）是性能优良、适宜制作半导体光电子和电子器件的材料。用这种材料研究发展的高功率、高亮度的蓝一绿一白发光管和蓝光激光器以及其他电子器件和光电子器件近几年来均有很大突破，有的己形成了产业。     

粒子对光的多级散射——辐射传播和相干背散射

此书对在少数随意粒子构成的介质中光和其它电磁辐射的多级散射进行了新的严谨的处理。书中将辐射传播理论（RTT）作为经典宏观电磁学的一个分支进行了全面介绍；用RTT系统分层次地讨论了不同粒子群介质中的电磁散射和相干背散射（CB）效应；用专门的章节严谨地讨论了辐射传播方程（RTE）的物理内涵和应用范围；比较了辐射传播的自洽微观物理和传统的唯象近似；讨论了解辐射传播方程的先进方法；并给出了在没有入侵粒子情况下，RTT和CB的应用实例及其物理基础、特征和遥感。     

Abrupt climate change of EastAsian Monsoon at 130 kaBP inferred from a high resolu-tion stalagmite δ18O record

^230Th ages and oxygen isotope data of a stalagmite from Shanbao Cave in Hubei Province characterize the East Asian Monsoon precipitation from 133 to 127ka. The decadal-scale high-resolution δ^18O record reveals a detailed transitional process from the Penultimate Glaciation to the Last Interglaciation. As established with ^230Th dates, the age of the Termination Ⅱ is determined to be 129.5±1.0 kaBP, which supports the Northern Hemisphere insolation as the triggers for the ice-age cycles. In our δ^18O record, the glacial/interglacial fluctuation reaches about 4‰, almost the same level as in other Asian Monsoon cave stalagmite δ^18O records. The transition of the glacial/interglacial period in our record can be recognized as four stepwise stages, among which, a rapid rise of monsoon precipitation follows the stage of “Termination Ⅱ pause”. The rapid rise is synchronous with the abrupt change of global methane concentration, which reflects that an increase in both Asian Monsoon precipitation and tropical wetland plays an important role in the global climate changes.     

基于Nios红外图像实时非均匀性校正研究

针对红外成像系统在图像处理中所涉及的数据量大,实时处理难于实现的特点,运用Altera公司SOPC-Nios嵌入式软核心处理器技术,提出一种利用FPGA硬件实现红外焦平面阵列实时非均匀性两点校正的方法.该方法针对非均匀性校正关键的内部循环和耗时算法,创建Nios嵌入式处理器的定制指令,将复杂的顺序指令简化为硬件实现的单指令,用硬件实现校正算法,极大地提高了系统的处理速度和性能,有效地解决了红外成像技术中实时性难题.     

Sequence and analysis of chromosome 1 of the plant Arabidopsis thaliana

The genome of the flowering plant Arabidopsis thaliana has five chromosomes. Here we report the sequence of the largest, chromosome 1, in two contigs of around 14.2 and 14.6 megabases. The contigs extend from the telomeres to the centromeric borders, regions rich in transposons, retrotransposons and repetitive elements such as the 180-base-pair repeat. The chromosome represents 25% of the genome and contains about 6,850 open reading frames, 236 transfer RNAs (tRNAs) and 12 small nuclear RNAs. There are two clusters of tRNA genes at different places on the chromosome. One consists of 27 tRNA(Pro) genes and the other contains 27 tandem repeats of tRNA(Tyr)-tRNA(Tyr)-tRNA(Ser) genes. Chromosome 1 contains about 300 gene families with clustered duplications. There are also many repeat elements, representing 8% of the sequence.