12 resultados para AK37-3821
em Chinese Academy of Sciences Institutional Repositories Grid Portal
Resumo:
本文叙述了周培源1945年发表具有剪应力的普通湍流理论以后,各种湍流模式理论的主要发展概况.
Resumo:
菊小长管蚜Macrosiphorniella sanborni是昆明地区花卉主要害虫之一,该虫对菊花嫩叶,嫩梢,花柄及花勒为害率达65.0%,个别大棚高达100,损失产量25.0%。室内外用1.8爱福丁3000,2500,2000倍液敌敌畏1500,1000,800倍液进行毒杀试验,爱福丁室内的毒杀率达96.6%,敌敌畏达96.3%;田间爱福丁害83.39%,敌敌畏达80.20%。
Resumo:
Submitted by zhangdi (zhangdi@red.semi.ac.cn) on 2009-06-04T08:36:34Z No. of bitstreams: 1 dspace.cfg: 33388 bytes, checksum: ac9630d3fdb36a155287a049e8b34eb7 (MD5)
Resumo:
用1-苯基-3-甲基-4-苯甲酰基-5-吡唑啉酮(PMBP)做萃取剂研究了从HNO_3介质中痕量钪的溶剂萃取行为。发现在很低的酸度下,PMBP几乎可以定量地萃取痕量的钪。同时,也讨论了用PMBP从~(18)O离子辐照过的铀靶溶液中萃取分离钍时钪的沾污。
Resumo:
本文介绍了HIRFL的中控台束诊系统的设计与实现。该系统从中控台的触摸板接收用户命令,然后经公共区送抵VAX通讯程序,再通过CAMAC的4096 * 24bit 静态存储器3821插件将命令送至一台286微机,由微机程序控制束诊设备读回数据,经相反的路径送抵VAX机束诊程序,再在中控台的显示器上显示出来。从显示出的数据可以了解束流品质,据此进行调束。该系统的所有程序都用C语言编写。通过公共区实现VAX机独立进程之间的通讯和通过3821实现VAX机和微机通讯是本工作鲜明的特点,也是本工作能否实现的关键之处。本工作除解决束诊系统难以挂接VAX机的问题外,其思想和方法还可应用于菘它分控站的分散与集中控制
Resumo:
抗生素产生菌的自身防卫机制研究李明祺,吴文芳,张成刚(中国科学院沈阳应用生态研究所,110015)抗生素是在微生物初级代谢过程中,由于特定的分支点受到阻碍而产生的物质,即所谓次级代谢物质。自然界中这种次级代谢物在微生物体内含量少,尚不至于对产生菌构成...
Resumo:
Bagnold-type bed-load equations are widely used for the determination of sediment transport rate in marine environments. The accuracy of these equations depends upon the definition of the coefficient k(1) in the equations, which is a function of particle size. Hardisty (1983) has attempted to establish the relationship between k(1) and particle size, but there is an error in his analytical result. Our reanalysis of the original flume data results in new formulae for the coefficient. Furthermore, we found that the k(1) values should be derived using u(1) and u(1cr) data; the use of the vertical mean velocity in flumes to replace u(1) will lead to considerably higher k(1) values and overestimation of sediment transport rates.