1997-2006年我国核心期刊研究的文献计量分析

采用文献计量学方法,从论文分布、作者分布、发表论文的机构和地区分布、基金资助 等方面对1997-2006年中国期刊全文数据库收录的有关核心期刊研究的论文进行了统计分析 ,对其研究现状和发展趋 势进行探讨,指出了我国有关核心期刊研究的一些不足,并提出了相应的对策。

     

家蚕对8种除草剂农药的毒性反应

近年来农资部门和植保部门出售的除草剂品种繁多,新药不断出现,有许多除草剂在大田作物和桑园中使用,这些除草剂农药对家蚕的毒性如何?笔者等近年来做了大田常用除草剂农药对家蚕的毒性试验,本文报道8种除草剂对家蚕的触杀毒力、安全间隔期及中毒症状,以便为蚕农科学用药提供依据。 1 材料与方法 1.1 供试农药 市售41%农达水剂(美国孟山都公司),72%2,4－D丁酯水剂(河北万全农药厂),盖草能(中国农业生产资料集团公司分装),2%使它隆乳油(美国陶氏益农公司),20%克无踪水溶液(英国卜内门化学工业有限公司),50%高特克悬浮剂(德国艾格福公司),50%扑草劲可湿性粉剂(昆明农药厂)和10%新代力可湿性粉剂(浙江省乐清市乐吉化工厂)共8种。 1.2 供试蚕品种 春季781×782*734,秋季苏3*秋3×苏4*苏12,由省农科院蚕研所春用组提供。 1.3 试验地点及桑品种 在本所生理病理室和桑树研究室进行,6年生油桑品种,低干养成,7500株／ha     

Elevation change of the southern greenland ice sheet

Seasat and Geosat satellite altimeter measurements for the Greenland ice sheet (south of 72 degreesN latitude) show that surface elevations above 2000 meters increased at an average rate of only 1. 5 +/- 0.5 centimeters per year from 1978 to 1988. In contrast, elevation changes varied regionally from -15 to +18 centimeters per year, seasonally by +/-15 centimeters, and interannually by +/-8 centimeters. The average growth rate is too small to determine if the Greenland ice sheet is undergoing a long-term change due to a warmer polar climate.     

网络传播者的道德教育研究

在虚拟的网络世界中, 构建网络道德, 很大程度上要依赖于网络传播者的道德和素质。本课题试图通过探讨网络传播者的思想道德素质状况, 分析如何加强传播者的网络道德教育, 提升其道德自律能力, 从而促进网络道德体系和网络文明建设。     

Behandlung von Reis mit Neem und Diatomeenerde zur Bekämpfung der vorratsschädlichen Coleopteren Sitophilus oryzae und Tribolium castaneum

The commercial available diatomaceous earth Fossil Shield® and the neem product Neem Azal-T/S® are tested as single treatments and in combination as controls for the stored product pests Sitophilus oryzae (L.) and Tribolium castaneum (Herbst). The diatomaceous earth, applied in concentrations of 0.5 g, 1 g and 2 g kg^-1 rice, reduced numbers of surviving beetles significantly (over a period of 3 weeks). A single treatment with the neem product, in concentrations of 0.01 g, 0.1 g, 0.2 g and 1 g azadirachtin kg^-1 rice, increased the mortality rate for both species significantly. The combination of neem and diatomaceous earth (1 g diatomaceous earth with 0.2 g or 1 g azadirachtin kg^-1 rice) was more effective than the single treatment in reducing numbers of surviving beetles.     

Behandlung von Reis mit Neem und Diatomeenerde zur Bek?mpfung der vorratssch?dlichen Coleopteren Sitophilus oryzae und Tribolium castaneum

The commercial available diatomaceous earth Fossil Shield® and the neem product Neem Azal-T/S® are tested as single treatments and in combination as controls for the stored product pests Sitophilus oryzae (L.) and Tribolium castaneum (Herbst). The diatomaceous earth, applied in concentrations of 0.5 g, 1 g and 2 g kg^-1 rice, reduced numbers of surviving beetles significantly (over a period of 3 weeks). A single treatment with the neem product, in concentrations of 0.01 g, 0.1 g, 0.2 g and 1 g azadirachtin kg^-1 rice, increased the mortality rate for both species significantly. The combination of neem and diatomaceous earth (1 g diatomaceous earth with 0.2 g or 1 g azadirachtin kg^-1 rice) was more effective than the single treatment in reducing numbers of surviving beetles.