全文获取类型
收费全文 | 189篇 |
免费 | 2篇 |
国内免费 | 4篇 |
专业分类
安全科学 | 4篇 |
废物处理 | 9篇 |
环保管理 | 56篇 |
综合类 | 34篇 |
基础理论 | 31篇 |
污染及防治 | 33篇 |
评价与监测 | 12篇 |
社会与环境 | 10篇 |
灾害及防治 | 6篇 |
出版年
2023年 | 1篇 |
2022年 | 2篇 |
2021年 | 5篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 7篇 |
2016年 | 5篇 |
2015年 | 1篇 |
2014年 | 8篇 |
2013年 | 15篇 |
2012年 | 12篇 |
2011年 | 10篇 |
2010年 | 10篇 |
2009年 | 9篇 |
2008年 | 9篇 |
2007年 | 6篇 |
2006年 | 14篇 |
2005年 | 7篇 |
2004年 | 7篇 |
2003年 | 4篇 |
2002年 | 5篇 |
2001年 | 4篇 |
2000年 | 6篇 |
1999年 | 4篇 |
1998年 | 5篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1984年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有195条查询结果,搜索用时 31 毫秒
91.
92.
Tony Smith 《Journal of Agricultural and Environmental Ethics》1995,8(2):157-158
Our massive tampering with the world's interdependent web of life-coupled with the environmental damage inflicted by deforestation, species loss, and climate change-could trigger widespread adverse effects, including unpredictable collapses of critical biological systems whose interactions and dynamics we only imperfectly understand. Uncertainty over the extent of these effects cannot excuse complacency or delay in facing the threats ... We the undersigned, senior members of the world's scientific community, hereby warn all humanity of what lies ahead. A great change in our stewardship of the earth and the life on it is required, if vast human misery is to be avoided and our global home on this planet is not to be irretrievably mutilated. (Union of Concerned Scientists, 1992) 相似文献
93.
Gayathri Prabhakar Stuart Schwartz Elizabeth Waters Cecile Punzalan Maimon M. Cohen 《黑龙江环境通报》1994,14(7):595-598
Karyotypic discrepancy among four different cell types is described in tissues derived from a pregnancy terminated because of chromosomal anomalies. Chorionic villus cells demonstrated 46,XX (direct preparation) and 46, XX/47,XX,+marl (cultured cells) karyotypes, while fetal skin fibroblasts had a karyotype of 47,XX,+ 18 and the placenta showed a triple mosaicism of 47,XX, + 18/47,XX,+mar1/48,XX,+ 18,+mar2. The origin of this complex chromosomal distribution and its significance are discussed in comparison with findings in similar cases. 相似文献
94.
Virginie Marques Paul Castagné Andréa Polanco Fernández Giomar Helena Borrero-Pérez Régis Hocdé Pierre-Édouard Guérin Jean-Baptiste Juhel Laure Velez Nicolas Loiseau Tom Bech Letessier Sandra Bessudo Alice Valentini Tony Dejean David Mouillot Loïc Pellissier Sébastien Villéger 《Conservation biology》2021,35(6):1944-1956
Assessing the impact of global changes and protection effectiveness is a key step in monitoring marine fishes. Most traditional census methods are demanding or destructive. Nondisturbing and nonlethal approaches based on video and environmental DNA are alternatives to underwater visual census or fishing. However, their ability to detect multiple biodiversity factors beyond traditional taxonomic diversity is still unknown. For bony fishes and elasmobranchs, we compared the performance of eDNA metabarcoding and long-term remote video to assess species’ phylogenetic and functional diversity. We used 10 eDNA samples from 30 L of water each and 25 hr of underwater videos over 4 days on Malpelo Island (pacific coast of Colombia), a remote marine protected area. Metabarcoding of eDNA detected 66% more molecular operational taxonomic units (MOTUs) than species on video. We found 66 and 43 functional entities with a single eDNA marker and videos, respectively, and higher functional richness for eDNA than videos. Despite gaps in genetic reference databases, eDNA also detected a higher fish phylogenetic diversity than videos; accumulation curves showed how 1 eDNA transect detected as much phylogenetic diversity as 25 hr of video. Environmental DNA metabarcoding can be used to affordably, efficiently, and accurately census biodiversity factors in marine systems. Although taxonomic assignments are still limited by species coverage in genetic reference databases, use of MOTUs highlights the potential of eDNA metabarcoding once reference databases have expanded. 相似文献
95.
96.
Tony Keenan 《组织行为杂志》1995,16(4):303-317
This investigation consisted of a questionnaire survey of the graduate selection methods used by 536 organizations in the U.K. The use of application forms for pre-selection purposes was widespread, although only a minority of organizations appeared to have approached this task in a systematic way. While references were also widely used, they were often taken up very late in the selection process, and only a minority of organizations sought specific information about job related abilities from referees. Interviews were universally used, both on their own, and as a component of an assessment centre. A total of 44 per cent of organizations used assessment centres as part of graduate recruitment. For most of those organizations using assessment centres, the interview was reported as being the most important component of the centre in determining final selection decisions. Most organizations provided some training for their selectors but this was typically general in nature, rather than being specific to graduate recruitment. The results are discussed in terms of their implications, both for practical application, and for future research. 相似文献
97.
Kumar PK Vethamony P Babu MT Srinivas K Thottam TJ 《Environmental monitoring and assessment》2004,90(1-3):269-288
This study presents the salient results of the oceanographic investigations carried out along the west coast of India to locate a dumping site for the dredged material generated from the capital of the proposed development of the all weather port. Based on the results of movement of disposed material obtained from a 2 dimensional coastal circulation model and considering the possibility of having a navigational channel later on in line with the port, a dumping site is recommended at the 15 m water depth contour with coordinates: Latitude 11 degrees 07.00'; Longitude 75 degrees 45.60', where the environmental impacts on the ecosystem due to dumping operations is considered to be minimum. 相似文献
98.
International declarations and charters have been produced to encourage and support higher education institutions (HEIs) to
address their environmental responsibilities. This paper discusses the results of a critical examination of a range of international
HEIs that have signed the global environmental Talloires Declaration. It also assesses the Talloires Secretariat (University
Leaders for a Sustainable Future, ULSF) and the extent to which this has been a primary stimulus. An international survey
was undertaken and the results presented in a discursive format in order to highlight key driving forces, barriers, and opportunities
for environmental responsibility in HEIs. Analysis reveals that they occur on two distinct and evolving levels: the macro
national framework level and the micro institutional framework level. Survey responses revealed that none of the HEIs have
an embedded institutional environmental culture and most did not have all the micro institutional mechanisms in place for
an integrated university-wide environmental response. Many of the institutional barriers to environmental responsibility occurred
as a result of this lack of strategy. The most significant institutional opportunity cited was enthusiastic individuals, particularly
those at senior management or directorate level, and these individuals were found to be a key driving force. Results also
showed that environmental reporting along the lines developed by the private sector is a flexible mechanism that can stimulate
progress internally and externally and can be cost effectively disseminated via the World Wide Web. Moreover the survey results
indicate that ULSF is not currently a primary stimulus for institution wide action. 相似文献
99.
Hoff PT Van Campenhout K Van de Vijver K Covaci A Bervoets L Moens L Huyskens G Goemans G Belpaire C Blust R De Coen W 《Environmental pollution (Barking, Essex : 1987)》2005,137(2):324-333
A perfluorooctane sulfonic acid (PFOS) assessment was conducted on gibel carp (Carassius auratus gibelio), carp (Cyprinus carpio), and eel (Anguilla anguilla) in Flanders (Belgium). The liver PFOS concentrations in fish from the Ieperlee canal (Boezinge, 250-9031 ng/g wet weight, respectively) and the Blokkersdijk pond (Antwerp, 633-1822 ng/g wet weight) were higher than at the Zuun basin (Sint-Pieters-Leeuw, 11.2-162 ng/g wet weight) and among the highest in feral fish worldwide. Eel from the Oude Maas pond (Dilsen-Stokkem) and Watersportbaan basin (Ghent) had PFOS concentrations ranging between 212 and 857 ng/g wet weight. The hepatic PFOS concentration was significantly and positively related with the serum alanine aminotransferase activity, and negatively with the serum protein content in eel and carp. The hepatic PFOS concentration in carp correlated significantly and negatively with the serum electrolyte concentrations whereas a significant positive relation was found with the hematocrit in eel. Although 13 organochlorine pesticides, 22 polychlorinated biphenyl (PCB) congeners and 7 polybrominated diphenyl ethers (PBDEs) were also measured in the liver tissue, only PCB 28, PCB 74, gamma-hexachlorocyclohexane (gamma-HCH) and hexachlorobenzene (HCB) were suggested to contribute to the observed serological alterations in eel. 相似文献
100.
Bruce C. Casto George G. Hatch Shiu L. Huang Joellen Lewtas Stephen Nesnow Michael D. Waters 《Environment international》1981,5(4-6)
Extracts from emissions of four diesel engines, a gasoline engine and three related environmental samples were tested in four in vitro assay systems designed to detect carcinogenic or mutagenic activity of chemicals. Samples from three of four diesel extracts, the gasoline engine, and all three related samples were positive in an enhancement of viral transformation assay. Two diesel samples, the gasoline engine extract and extract from coke oven emissions were positive for mutation induction in Chinese hamster ovary cells. Only the gasoline engine extract and the coke oven sample were positive in a DNA fragmentation assay using alkaline sucrose gradients. Experiments using chemical transformation of Syrian hamster embryo cells as an assay method have not been completed. 相似文献