泥沙颗粒的扬动机理分析

从分析床面附近泥沙颗粒的运动特征出发，较细致地论述了沙粒在水流中从推移运动到扬起悬浮的物理过程，根据水槽试验的基本现象，讨论了过去一些理论中存在的问题和不足，概括了泥沙颗粒在水流中从床面扬起的基本模式，从二相流角度出发，分析了沙粒在水流中扬起的动力学机理。

高速掺气水流的压缩性准则

利用双流体连续介质模型建立了高速掺气水流基本方程，通过量级分析等方法研究了高速掺气水流的压缩性准则。在定常均质掺气水流中，绝热Mach数M决定着压缩性效应的强弱: M< 0.3时流动可视为不可压的，否则需要考虑压缩性效应。

Single Curved Fiber Sedimentation Under Gravity

Dynamics of single curved fiber sedimentation under gravity are simulated by using the lattice Boltzmann method. The results of migration and rotation of the curved fiber at different Reynolds numbers are reported. The results show that the rotation and migration processes are sensitive to the curvature of the fiber. (c) 2007 Elsevier Ltd. All rights reserved.

Single curved fiber sedimentation under gravity

Dynamics of single curved fiber sedimentation under gravity are simulated by using the lattice Boltzmann method. The results of migration and rotation of the curved fiber at different Reynolds numbers are reported. The results show that the rotation and migration processes are sensitive to the curvature of the fiber. (c) 2007 Elsevier Ltd. All rights reserved.

Fuzzy reasoning morphological operators and their optical implementation

Fuzzy-reasoning theory is widely used in industrial control. Mathematical morphology is a powerful tool to perform image processing. We apply fuzzy-reasoning theory to morphology and suggest a scheme of fuzzy-reasoning morphology, including fuzzy-reasoning dilation and erosion functions. These functions retain more fine details than the corresponding conventional morphological operators with the same structuring element. An optical implementation has been developed with area-coding and thresholding methods. (C) 1997 Optical Society of America.

Phase unwrapping based on branch cut placing and reliability ordering

A new 2-D quality-guided phase-unwrapping algorithm, based on the placement of the branch cuts, is presented. Its framework consists of branch cut placing guided by an original quality map and reliability ordering performed on a final quality map. To improve the noise immunity of the new algorithm, a new quality map, which is used as the original quality map to guide the placement of the branch cuts, is proposed. After a complete description of the algorithm and the quality map, several wrapped images are used to examine the effectiveness of the algorithm. Computer simulation and experimental results make it clear that the proposed algorithm works effectively even when a wrapped phase map contains error sources, such as phase discontinuities, noise, and undersampling. (c) 2005 Society of Photo-Optical Instrumentation Engineers.

石榴豹纹木蠹蛾Zeuzera coffeae (Nietner)生物学及其防治研究

：石榴豹纹木蠢蛾是云南蒙自地区石榴的主要害虫之一。幼虫蛀害石榴树枝干，具多次转移危害习性，并在蛀道 内越冬。受害部位以上枝干萎蔫、枯死。危害枝干率达1．0％。15％，重者达30％。40％。该虫在云南蒙自石榴植区一 年发生一代，垮年度完成，越冬态不甚明显。采取综合防治措施后，其危害率由10％。15％降为0．2％～O．31％。

男性不育患者精浆中表皮生长因子含量测定

为了探讨表皮生长因子与男性精子发生的关系, 采用放射免疫学方法对正常男性精浆中表皮生长因子 (EGF) 含量进行测定, 结果二组之间EGF 含量经t′检验差异有显著性( P < 0105) , 提示EGF 可能参与了男性生殖 系统中精子发生的调控。

贝叶斯联合模型与中国洞穴鱼类分化时间的估算(鲤科:金线鲃属)

金线鲃属分布于中国云贵高原及周边地区,包括10多种适应于洞穴生活、具有不同程度眼睛和色素退化的典型洞穴鱼类.迄今为止,金线鲃属的系统发育关系还存在很大争议.我们获得了34种金线鲃属鱼类及外类群的细胞色素b和ND4基因序列,用贝叶斯联合模型分析数据,重建了金线鲃属的系统发育关系;并用松散分子钟估算了本属及内部分支的起源时间.金线鲃属的单系性得到强烈的支持,本属可分为6个分支.此外,本研究结果还支持洞穴物种的多系起源假说以及季氏金线鲃(Sinocyclocheilus jii)的基部位置.松散分子钟估算表明,

扁担塘两种底栖动物的周年生产量

研究了1996年4月至1997年3月间扁担塘两种底栖动物———幽蚊和圆扁螺的周年生产量,采用体长频率法测算的生产量分别是:幽蚊周年生产量湿质量为0.1419g·m-2·a-1,干质量为0.0114g·m-2·a-1,P/B系数为1.8;圆扁螺的周年生产量带壳湿质量为1.6266g·m-2·a-1,去壳干质量为0.0732g·m-2·a-1,P/B系数为7.1.但与国外数据相比,这些结果比较适中,说明扁担塘并不是幽蚊和圆扁螺的最适生长环境.

福尔马林固定白鱀豚标本DNA提取及其遗传多样性的初步研究

福尔马林固定标本是宝贵的遗传资源,但是如何有效利用其中的遗传信息一直存在问题。本文尝试从标本预处理、消化、PCR扩增各方面综合考虑和优化改进,成功提取并扩增21头福尔马林固定白豚标本线粒体DNA控制区410bp片段。采用了3种预处理方法尽量去除固定标本中残存的甲醛,从试验结果来看,从酒精梯度+临界点干燥处理的标本中提取的DNA在扩增时具有明显优势。通过蛋白酶K消化过程中对于酶的浓度、温浴时间的比较试验,发现随着采用大幅提高酶浓度、延长消化时间等高强度的蛋白酶消化操作后,DNA的质量和产量均得到显著提高。

alpha-tocopherol is essential for acquired chill-light tolerance in the cyanobacterium Synechocystis sp strain PCC 6803

Unlike Escherichia coli, the cyanobacterium Synechocystis sp. strain PCC 6803 is insensitive to chill (5 degrees C) in the dark but rapidly losses viability when exposed to chill in the light (100 mu mol photons m(-2) s(-1)). Preconditioning at a low temperature (15 degrees C) greatly enhances the chill-light tolerance of Synechocystis sp. strain PCC 6803. This phenomenon is called acquired chill-light tolerance (ACLT). Preconditioned wild-type cells maintained a substantially higher level of alpha-tocopherol after exposure to chill-light stress. Mutants unable to synthesize alpha-tocopherol, such as slr1736, slr1737, slr0089, and slr0090 mutants, almost completely lost ACLT. When exposed to chill without light, these mutants showed no or a slight difference from the wild type. When complemented, the slr0089 mutant regained its ACLT. Copper-regulated expression of slr0090 from P-petE controlled the level of et-tocopherol and ACLT. We conclude that alpha-tocopherol is essential for ACLT of Synechocystis sp. strain PCC 6803. The role of a-tocopherol in ACLT may be based largely on a nonantioxidant activity that is not possessed by other tocopherols or pathway intermediates.