全文获取类型
收费全文 | 695篇 |
免费 | 22篇 |
国内免费 | 10篇 |
专业分类
安全科学 | 46篇 |
废物处理 | 42篇 |
环保管理 | 100篇 |
综合类 | 112篇 |
基础理论 | 138篇 |
污染及防治 | 182篇 |
评价与监测 | 52篇 |
社会与环境 | 43篇 |
灾害及防治 | 12篇 |
出版年
2023年 | 2篇 |
2022年 | 10篇 |
2021年 | 20篇 |
2020年 | 12篇 |
2019年 | 17篇 |
2018年 | 25篇 |
2017年 | 23篇 |
2016年 | 28篇 |
2015年 | 16篇 |
2014年 | 30篇 |
2013年 | 72篇 |
2012年 | 22篇 |
2011年 | 50篇 |
2010年 | 32篇 |
2009年 | 30篇 |
2008年 | 36篇 |
2007年 | 41篇 |
2006年 | 47篇 |
2005年 | 27篇 |
2004年 | 23篇 |
2003年 | 29篇 |
2002年 | 23篇 |
2001年 | 6篇 |
2000年 | 8篇 |
1999年 | 3篇 |
1998年 | 7篇 |
1997年 | 5篇 |
1996年 | 5篇 |
1995年 | 7篇 |
1994年 | 7篇 |
1992年 | 8篇 |
1991年 | 3篇 |
1990年 | 2篇 |
1989年 | 3篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1983年 | 6篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1966年 | 1篇 |
1965年 | 1篇 |
1961年 | 2篇 |
1957年 | 1篇 |
1956年 | 2篇 |
1955年 | 3篇 |
1949年 | 1篇 |
1947年 | 1篇 |
排序方式: 共有727条查询结果,搜索用时 875 毫秒
351.
Le Trinh Hai Pham Hoang Hai Chu Lam Thai Jean Hugé Albert Ahenkan Le Xuan Quynh Vu Van Hieu Nguyen Le The Tung Luc Hens 《Environmental Modeling and Assessment》2011,16(6):541-550
Sustainable development is a widespread concept. Indicator selection and sustainability assessment are basic methods to analyse
the sustainable development process. This study aims to develop a software application to select indicators and to allocate
weightings to the indicators and the sub-indexes, so that they can be listed in a sustainability assessment. The Visual Basic
software is used to develop a software package based on Delphi, analytic hierarchy, normalization and combination processes.
Software for sustainability assessment was developed. Thirty-five indicators are selected as a first step of which eight health
indicators and eight environmental ones and their sub-indexes are given weightings. The indicators are normalized. Sub-indexes
are combined into a composite sustainable development index. The model is validated showing the ‘main features’ of the sustainability
situation on health and environmental aspects in the Quang Tri province during the period 2000–2005. The results support the
decision-making process of the competent authorities. 相似文献
352.
Marson Eduardo O. Paniagua Cleiseano E.S. Costa-Serge Nayara M. Sousa Raquel M.F. Silva Gizele D. Becker Raquel W. Sirtori Carla Starling Maria Clara V. M. Carvalho Solidônio R. Trovó Alam G. 《Environmental science and pollution research international》2021,28(19):23582-23594
Environmental Science and Pollution Research - As the presence of antibiotics in environmental waters enhances antimicrobial resistance, photolysis and heterogeneous photocatalysis of... 相似文献
353.
354.
355.
356.
Summary Nymphs and adult females ofBlatta orientalis and nymphs ofEurycotis floridana produce a proteinaceous sticky secretion which accumulates on the last abdominal tergites. The proteic patterns do not differ between individuals of the same species. HPLC analyses show that all the common amino acids are found in both species, aspartic and glutamic acids representing 24 to 37% of the total amount of amino acids. InB. orientalis, glutamic acid is the more abundant amino acid whereas inE. floridana it is the aspartic acid. The secretion appears and accumulates rapidly on isolated insects. Behavioural assays revealed that these secretions have a defensive role. 相似文献
357.
358.
A prenatal screening programme for Down's syndrome potentially detecting 76 per cent of affected pregnancies in the South Australian general population at an amniocentesis rate of 3.9 per cent was designed following analysis of mid-trimester serum samples from 57 women who carried an affected fetus. This equates to one affected pregnancy being detected for 41 chromosomal analyses performed. For the experimental series, 75.4 per cent of affected pregnancies were detected, while 4.1 per cent of control specimens produced estimated risk odds consistent with further action. A maternal risk odds of birth of a Down's syndrome fetus of 1:420 was taken as the decision value, which is the prevalence of Down's syndrome births to 35-year-old mothers in South Australia. This screening performance was achieved by investigating combinations of serum analytes not previously reported and by refining the calculation of maternal risk odds to include selective weighting of indicator analytes. Combination of the measurements of free α-subunits and β-subunits of chorionic gonadotrophin, α-fetoprotein, unconjugated oestriol, and placental lactogen was found to be most effective in indicating Down's syndrome fetuses. In all combinations of analytes tested, replacing the measurements of free α-subunits and free β-subunits of chorionic gonadotrophin with the measurement of intact chorionic gonadotropin produced a less effective screen. 相似文献
359.
Samandoulgou Idrissa Vimont Allison Fernandez Benoit Fliss Ismail Jean Julie 《Food and environmental virology》2021,13(4):485-492
Food and Environmental Virology - Biofilms can constitute permanent threats to food safety and public health. Bacteria and viruses lodged in biofilm can escape cleaning and sanitizing agents. The... 相似文献
360.
Thomas W. Bodey Elena Angulo Alok Bang Céline Bellard Jean Fantle-Lepczyk Bernd Lenzner Anna Turbelin Yuya Watari Franck Courchamp 《Conservation biology》2023,37(2):e14034
Biological invasions represent a key threat to insular systems and have pronounced impacts across environments and economies. The ecological impacts have received substantial focus, but the socioeconomic impacts are poorly synthesized across spatial and temporal scales. We used the InvaCost database, the most comprehensive assessment of published economic costs of invasive species, to assess economic impacts on islands worldwide. We analyzed socioeconomic costs across differing expenditure types and examined temporal trends across islands that differ in their political geography—island nation states, overseas territories, and islands of continental countries. Over US$36 billion in total costs (including damages and management) has occurred on islands from 1965 to 2020 due to invasive species’ impacts. Nation states incurred the greatest total and management costs, and islands of continental countries incurred costs of similar magnitude, both far higher than those in overseas territories. Damage-loss costs were significantly lower, but with qualitatively similar patterns across differing political geographies. The predominance of management spending differs from the pattern found for most countries examined and suggests important knowledge gaps in the extent of many damage-related socioeconomic impacts. Nation states spent the greatest proportion of their gross domestic products countering these costs, at least 1 order of magnitude higher than other locations. Most costs were borne by authorities and stakeholders, demonstrating the key role of governmental and nongovernmental bodies in addressing island invasions. Temporal trends revealed cost increases across all island types, potentially reflecting efforts to tackle invasive species at larger, more socially complex scales. Nevertheless, the already high total economic costs of island invasions substantiate the role of biosecurity in reducing and preventing invasive species arrivals to reduce strains on limited financial resources and avoid threats to sustainable development goals. 相似文献