首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   83篇
  免费   0篇
  国内免费   4篇
安全科学   7篇
废物处理   13篇
综合类   15篇
基础理论   24篇
污染及防治   13篇
评价与监测   6篇
社会与环境   9篇
  2023年   1篇
  2022年   3篇
  2021年   1篇
  2019年   1篇
  2018年   4篇
  2017年   1篇
  2016年   2篇
  2015年   1篇
  2014年   1篇
  2013年   3篇
  2012年   2篇
  2011年   5篇
  2010年   6篇
  2009年   6篇
  2008年   10篇
  2007年   1篇
  2006年   8篇
  2005年   2篇
  2004年   2篇
  2003年   5篇
  2001年   2篇
  1999年   1篇
  1998年   2篇
  1997年   3篇
  1996年   1篇
  1995年   2篇
  1992年   1篇
  1991年   1篇
  1989年   1篇
  1988年   2篇
  1985年   1篇
  1976年   1篇
  1970年   1篇
  1967年   1篇
  1962年   1篇
  1958年   1篇
排序方式: 共有87条查询结果,搜索用时 15 毫秒
81.
Plutonium in monthly deposition samples collected in Tsukuba (the Meteorological Research Institute), Japan from 1990 to end of 2001 is reported, together with monthly plutonium deposition in Nagasaki and Yonaguni in 2000. The annual deposition of (239,240)Pu during the period from 1990 to 2001 shows no systematic interannual variation. However, monthly (239,240)Pu depositions show a typical seasonal variation with a maximum in spring season (March to April), which corresponds to seasonal cycle of soil dusts originating from the East Asian arid area. Plutonium isotopic ratios in the deposition samples suggest that significant amounts of the recent (239,240)Pu deposition observed in Japan are attributed to the resuspension of plutonium-bearing surface soil particles; resuspended plutonium originates from the East Asian arid areas. The recent increased tendency of (239,240)Pu content in residues in deposition samples may reflect desertification in the East Asian continent.  相似文献   
82.
To evaluate the osmoregulatory ability of eyedstage embryos of laboratory-reared chum salmon, Oncorhynchus keta, we examined changes in osmolality of the perivitelline fluid and blood following transfer to 50 and 100% seawater (SW), together with morphological changes in chloride cells present in the yolk sac membrane. Transfer to SW did not cause any significant change in the whole egg weight. However, the embryos shrank when the eggs were transferred to SW, whereas the perivitelline space increased at the expense of the embryo. Osmolality of the perivitelline fluid increased rapidly to reach environmental levels 3 h after transfer, indicating that the egg shell is permeable to ions and water. Blood osmolality increased after transfer to SW, reached a peak level at 3 h, and then decreased gradually. The chloride cells in the yolk sac membrane became activated following transfer, as shown by increased cell size and frequent appearance of apical openings. These results indicate that the eyed-stage embryos of chum salmon possess hypoosmoregulatory ability and that chloride cells in the yolk sac membrane may be involved in salt extrusion, in place of gill chloride cells, during the late embryonic stage.  相似文献   
83.
In the present study, an attempt was made to compare the statistical tools used for analysing the data of repeated dose toxicity studies with rodents conducted in 45 countries, with that of Japan. The study revealed that there was no congruence among the countries in the use of statistical tools for analysing the data obtained from the above studies. For example, to analyse the data obtained from repeated dose toxicity studies with rodents, Scheffé's multiple range and Dunnett type (joint type Dunnett) tests are commonly used in Japan, but in other countries use of these statistical tools is not so common. However, statistical techniques used for testing the above data for homogeneity of variance and inter-group comparisons do not differ much between Japan and other countries. In Japan, the data are generally not tested for normality and the same is true with the most of the countries investigated. In the present investigation, out of 127 studies examined, data of only 6 studies were analysed for both homogeneity of variance and normal distribution. For examining homogeneity of variance, we propose Levene's test, since the commonly used Bartlett's test may show heterogeneity in variance in all the groups, if a slight heterogeneity in variance is seen any one of the groups. We suggest the data may be examined for both homogeneity of variance and normal distribution. For the data of the groups that do not show heterogeneity of variance, to find the significant difference among the groups, we recommend Dunnett's test, and for those show heterogeneity of variance, we recommend Steel's test.  相似文献   
84.
Journal of Material Cycles and Waste Management - Mechanical properties and slope stability of inert waste landfills under seismic condition were studied with three different approaches: in-situ...  相似文献   
85.
Journal of Material Cycles and Waste Management - Dredged soils are typically mixed with additives to improve their mechanical properties and reduce the risks of leaching toxic elements. An...  相似文献   
86.
We experienced five cases of Salmonella oranienburg infection in children living in Saitama prefecture. Thereafter the number of patients with S. oranienburg infection increased not only in Saitama (55 cases) but also in other parts of Japan in 1999 (1505 cases) in 1999. The source of S. oranienburg infection was identified as a snack made from semi-dry cuttlefish.  相似文献   
87.
Journal of Material Cycles and Waste Management - The status of material reuse and recycling in Japan is reviewed with an emphasis on the efforts by the national government. First, the national...  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号