平行涡管三维合并的直接数值模拟

采用拟谱方法求解Navier-Stokes方程，对两个同向平行涡管的三维合并过程进行了直接数值模拟，分析了它的不同于二维合并的“缠绕式”特性。特别地，对在合并过程中产生的垂直于初始涡管方向的非主体涡量的意义和物理机制进行了探讨。

Threatened fishes of the world: Silurus mento Regon, 1904 (Siluriformes: Siluridae)

Conservation status, identification, distribution, abundance, habitat and ecology, threats, conservation actions and recommendations of an endemic catfish, King's bullhead, Silurus mento were introduced.

Threatened fishes of the world: Pseudobagrus medianalis (Regan) 1904 (Bagridae)

Conservation status, identification, distribution, abundance, habitat and ecology, threats, conservation actions and recommendations of a endemic bagrid catfish, Dianchi bullhead, Pseudobagrus medianalis were introduced based on data and knowledge from a

分数量子霍尔效应-1998年诺贝尔物理学奖介绍

1998年10月，三位美国科学家，Daniel Tsui(崔琦，美籍华裔科学家)、Horst Stormer(美国德裔科学家)和Robert Laughlin，因他们在发现分数量子霍尔效应方面所作出的杰出贡献而获得诺贝尔物理学奖。文章力图从物理角度概要介绍分数量子霍尔效应的主要物理现象和机制。

1998洪涝灾害的深层次原因系统分析

１９９８年６月～１９９８年９月长江流域发生特大洪灾，以高水迎峰，上压下顶，峰急水猛，时长量大为特征。分析洪灾形成的主要原因，除气候反常、降雨集中等自然因素外，也存在水土流失，植被减少，围湖造田，河道淤积，水利工程失修、老化，法制观念淡薄，投入问题尖锐，承灾功能脆弱，人口急剧增长，协调失误等深层次的问题。

A preliminary genetic map of Zhikong scallop (Chlamys farreri Jones et Preston 1904)

Zhikong scallop (Chlamys farreri Jones et Preston 1904) is one of the most important aquaculture species in China. The development of a genetic linkage map would provide a powerful tool for the genetic improvement of this species. Amplified fragment length polymorphism (AFLP) is a PCR-based technique that has proven to be powerful in genome fingerprinting and mapping, and population analysis. Genetic maps of C. farreri were constructed using AFLP markers and a full-sib family with 60 progeny. A total of 503 segregating AFLP markers were obtained, with 472 following the Mendelian segregation ratio of 1:1 and 31 markers showing significant (P< 0.05) segregation distortion. The male map contained 166 informative AFLP markers in 23 linkage groups covering 2468 cM. The average distance between markers was 14.9 cM. The female genetic map consisted of 198 markers in 25 linkage groups spanning 3130 cM with an average inter-marker spacing of 15.8 cM. DNA polymorphisms that segregated in a 3:1 ratio as well as the AFLP markers that were heterozygous in both parents were included to construct combined linkage genetic map. Five shared linkage groups, ranging from 61.1 to 162.5 cM, were identified between the male and female maps, covering 431 cM. Amplified fragment length polymorphism markers appeared to be evenly distributed within the linkage groups. Although preliminary, these maps provide a starting point for the mapping of the functional genes and quantitative trait loci in C. farreri.