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   147篇
  免费   0篇
  国内免费   4篇
安全科学   3篇
废物处理   17篇
环保管理   8篇
综合类   18篇
基础理论   40篇
污染及防治   50篇
评价与监测   4篇
社会与环境   9篇
灾害及防治   2篇
  2023年   2篇
  2022年   2篇
  2021年   2篇
  2020年   1篇
  2019年   2篇
  2018年   1篇
  2017年   1篇
  2016年   1篇
  2015年   2篇
  2014年   6篇
  2013年   15篇
  2012年   6篇
  2011年   9篇
  2010年   6篇
  2009年   8篇
  2008年   7篇
  2007年   11篇
  2006年   10篇
  2005年   7篇
  2004年   5篇
  2003年   3篇
  2002年   11篇
  2001年   8篇
  2000年   2篇
  1999年   5篇
  1998年   2篇
  1997年   1篇
  1995年   1篇
  1994年   1篇
  1993年   1篇
  1992年   1篇
  1990年   1篇
  1988年   2篇
  1985年   1篇
  1982年   2篇
  1981年   2篇
  1976年   1篇
  1973年   1篇
  1958年   1篇
排序方式: 共有151条查询结果,搜索用时 31 毫秒
71.
Biwa湖 Yodo河水系为主要的居民中心及其周围的市政机构提供城市用水和工业用水 .它也提供农业用水,主要在 Biwa湖排水区域 .该水系服务的人口总数约为 1400万人 . 这个水系构成了 Keihanshin工业区的主要部分(按照字面上是指京都、大阪和神户),这是一个以沿大阪海湾-濑户内海的狭长地带发展为特征的一个区域 .Keihanshin的工业产值居日本的第三位,约占国内生产总值的 12.4% .一个复杂的供水网和废水网支持着高水平的工业和农业活动 .  相似文献   
72.
Biwa湖-Yodo河水系为主要的居民中心及其周围的市政机构提供城市用水和工业用水 .它也提供农业用水,主要在 Biwa湖排水区域 .该水系服务的人口总数约为 1400万人 .   这个水系构成了 Keihanshin工业区的主要部分(按照字面上是指京都、大阪和神户),这是一个以沿大阪海湾-濑户内海的狭长地带发展为特征的一个区域 .Keihanshin的工业产值居日本的第三位,约占国内生产总值的 12.4% .一个复杂的供水网和废水网支持着高水平的工业和农业活动 .……  相似文献   
73.
74.
75.
A new method to single out the environmental factor limiting the life of any macrobenthic animal under stressed condition is proposed. The method is based on the assumption that the influence of each environmental factor on the life of a species can be expressed by an S-shaped function having lethal, limiting and non-limiting ranges, and the combined effect of several environmental factors is expressed by a multiple of these functions. To single out a lethal factor, we used the cumulative curve of abundance arranged in the order of each environmental factor. Comparison of these curves enables us to identify the most effective environmental factor limiting the life of a particular species and determine its effective range. Determination can be made from a single field observation without recourse to specially prepared experimental data if a sufficiently extensive survey was made in a field observation. The method was applied to the field data obtained from 248 stations at Lake Shinji, Japan, in the summer of 1982.  相似文献   
76.
This paper investigates the impacts of Tropical Cyclone Winston (2016) on rural Indo-Fijians and their response to the devastation. Studies have previously examined how rural communities in Pacific Island countries respond to severe climatic events, arguing that traditional knowledge of the climate, together with indigenous techniques, contribute substantially to recovery from a disaster. Strong communal bonds have also been identified as an influencing factor. Disaster risk reduction frameworks often assume the availability of such knowledge and capital. Yet, little research has been done on how minority groups with limited access to such knowledge and capital cope with disaster-related damage. The current study shows that rural Indo-Fijians responded to the consequences of Tropical Cyclone Winston differently to indigenous Fijians, owing to relatively limited access to traditional awareness of the climate, communal labour sharing, and intra- and/or inter-community networks. The findings point to the necessity to implement a more inclusive disaster risk reduction framework.  相似文献   
77.
藏北高原土壤温度异常变化及其与雪灾关系初析   总被引:10,自引:1,他引:10  
通过对GAME-Tibet野外工作期间所得藏北高原一个年周期的土壤温度资料的初步分析,发现藏北高原1997 ̄1998年冬半年土壤日温差的分布存在明显的异常现象;指出了这种异常现象的发生可能与藏北高原1997年冬天的特大雪灾有关。从浅层土壤日温差的异常变化,定性地说明了藏北高原1997 ̄1998年冬半年不同地点雪灾的严重程度,但由于受资料的限制,目前尚无法进行定量的评估。  相似文献   
78.
Spatiotemporal recruitment patterns of scleractinian corals were investigated around Iriomote Island, Ryukyu Archipelago, Japan, in relation to adult coral cover in 2005 and 2006. Although almost all corals were broadcasting spawners, the relationship between recruitment and adult coral cover differed among coral families (Acroporidae, Poritidae, and Pocilloporidae), likely due to differences in embryonic development time. For spawning pocilloporid corals, whose larvae develop relatively more rapidly, recruitment was higher at sites where adult coral cover was higher. In contrast, recruitment was not related to adult coral cover in acroporid and poritid corals, whose embryonic development times were relatively slow. Moreover, recruitment of acroporid corals varied between years, and recruitment was greater at leeward compared to windward reefs for a few days after spawning. These results suggest that embryonic development time and wind-driven surface currents affect larval dispersal and subsequent recruitment patterns at a local scale. Based on embryonic development time, some spawning corals are more likely to have higher rates of self-seeding than others. Our results predict that among spawning corals, local populations of acroporid and poritid corals, whose larvae potentially disperse over long distances and recruit in neighboring reefs, are more resilient to local disturbances than those of pocilloporid corals, whose recruitment relies upon local stock.  相似文献   
79.
The apparent aqueous solubility of the endocrine disruptor in hydroxypropyl‐cyclodextrin (HP‐CD) solutions was investigated for evaluating the remediation of soil contamination and ground water pollution. The apparent solubility of bisphenol A (BPA) in water was significantly increased in HP‐CD solutions. The solubilization effect of HP‐CD's is caused by the formation of inclusion complexes of BPA and cyclodextrin. The relative aqueous‐phase concentration of BPA linearly increased with increasing HP‐CD concentration. The solubility of BPA increased in the order of the addition of HP‐a‐CD, HP‐7‐CD, and HP‐ß‐CD. However, it did not depend upon the degree of hydroxypropylation substitution. It is concluded that HP‐CD may be utilized for the remediation of soil contamination.  相似文献   
80.
Seagrass beds are often considered to be important nurseries for coral reef fish, yet the effectiveness of these nursery functions (refuge and food availability) at different juvenile stages is poorly understood. To understand how the demands of juvenile fish on seagrass nursery functions determines the timing of ontogenetic habitat shifts from seagrass beds to coral reefs, we conducted visual transect survey and field tethering and caging experiments on three different sizes of the coral reef fish Pacific yellowtail emperor (Lethrinus atkinsoni) during its juvenile tenure in seagrass beds at Ishigaki Island, southern Japan. The study showed that although the number of individual L. atkinsoni juveniles decreased by >90 % during their stay in the seagrass nursery, the shelter and/or food availability functions of the nursery, at least for a juvenile size of approximately 5 cm total length (TL), provided the best survival and growth option. The timing of ontogenetic migration to coral reefs of larger fish (>8 cm TL) was attributed to foraging efficiency for larger food items in different habitats. Overall, the function of the seagrass bed nursery changed with juvenile body size, with marginally higher survival and significantly greater growth rates during early juvenile stages in seagrass beds compared to coral reefs. This would contribute to the enhancement in the number of individuals eventually recruited to adult populations.  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