全文获取类型
收费全文 | 33308篇 |
免费 | 402篇 |
国内免费 | 291篇 |
专业分类
安全科学 | 1006篇 |
废物处理 | 1264篇 |
环保管理 | 5104篇 |
综合类 | 4978篇 |
基础理论 | 9373篇 |
环境理论 | 25篇 |
污染及防治 | 8635篇 |
评价与监测 | 1999篇 |
社会与环境 | 1380篇 |
灾害及防治 | 237篇 |
出版年
2022年 | 198篇 |
2021年 | 217篇 |
2020年 | 180篇 |
2019年 | 257篇 |
2018年 | 450篇 |
2017年 | 448篇 |
2016年 | 646篇 |
2015年 | 572篇 |
2014年 | 757篇 |
2013年 | 2587篇 |
2012年 | 975篇 |
2011年 | 1446篇 |
2010年 | 1171篇 |
2009年 | 1188篇 |
2008年 | 1444篇 |
2007年 | 1537篇 |
2006年 | 1358篇 |
2005年 | 1133篇 |
2004年 | 1155篇 |
2003年 | 1096篇 |
2002年 | 1076篇 |
2001年 | 1304篇 |
2000年 | 948篇 |
1999年 | 626篇 |
1998年 | 488篇 |
1997年 | 487篇 |
1996年 | 502篇 |
1995年 | 541篇 |
1994年 | 490篇 |
1993年 | 453篇 |
1992年 | 473篇 |
1991年 | 411篇 |
1990年 | 414篇 |
1989年 | 450篇 |
1988年 | 373篇 |
1987年 | 331篇 |
1986年 | 316篇 |
1985年 | 344篇 |
1984年 | 324篇 |
1983年 | 365篇 |
1982年 | 352篇 |
1981年 | 320篇 |
1980年 | 282篇 |
1979年 | 288篇 |
1978年 | 250篇 |
1977年 | 209篇 |
1976年 | 210篇 |
1975年 | 204篇 |
1973年 | 179篇 |
1972年 | 203篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
81.
82.
Sofie Adolfsson Jörby 《Journal of Environmental Planning and Management》2002,45(2):219-244
Four small- to medium-sized municipalities in the south-east of Sweden were chosen for a 5-year study of their Local Agenda 21 (LA21) processes. The study shows that the LA21 processes have instigated many new ideas, brought fields together and introduced new subjects into the municipal world. In the decisions of the local governments environmental considerations are treated seriously. There are signs of an extended dialogue and of public influence, especially within fields where citizens are directly involved. LA21 does not seem to have great influence on which natural resources are dealt with, but does on how they are dealt with. New stakeholders within and outside the municipal organization have been identified through the LA21 processes, and more comprehensive ways of solving problems and a positive climate for testing new ideas have been created. In these respects LA21 has been and will be a significant support to the development of appropriate natural resource management at the local level. 相似文献
83.
84.
In a 1981 survey of 436 Florida citrus growers, 27 pesticide related poisoning incidents were reported that were to have taken place within one year of the interview date. From these reports it is possible to estimate that there are 376 citrus fieldworker related poisonings per year in Florida. This number of estimated poisonings may be developed into an incidence rate of 113 fieldworker poisonings per 10,000 fieldworkers. 相似文献
85.
86.
Global change, i.e. the mega-process radically transforming the relationship between nature and human civilization since
the end of World War II, is investigated from the point of view of systems analysis. It is argued that this unbridled process
should rather be domesticated by planetary control strategies transpiring from a new science called “geocybernetics”. The
formal aspects of geocybernetic theory are sketched and illustrated in a tutorial theatre world reflecting the overall environment
and development problematic. Within this setting a straightforward operationalization of the sweeping “sustainable development”
ideal through a set of concise paradigms can be achieved. Evidence is provided that geocybernetics is actually feasible on
the basis of earth system modelling and fuzzy-control techniques. 相似文献
87.
88.
The effectiveness of inorganic alumino-silicate sorbents (alumina and kaolinite) to adsorb airborne lead and cadmium from the effluent stream of a simulated waste incinerator was studied. A 20 kW (68,000 BTU/h) flow reactor was used to achieve the temperature and residence times typical of a waste incinerator. Solutions containing lead or cadmium were introduced yielding airborne metals concentrations between 15 and 150 ppm. Gas samples were drawn into a particle impactor that collected the airborne particles and condensed phase metal aerosols, separating them into ten size ranges from 0.2 μm to greater than 10 μm. Metals to sorbent mass ratios between 0.03 and 1.56 were investigated. Scavenging efficiency increased as the ratio of sorbent to injected metal mass was increased. The scavenging efficiencies were as high as 76% for lead scavenged by kaolinite to as low as 14% for cadmium scavenged by alumina. 相似文献
89.
In order to keep subscribers up-to-date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of prenatal diagnosis. Each bibliography is divided into 17 sections: 1 Books, Reviews & Symposia; 2 General Interest; 3 Normal Fetal Development; 4 Gametogenesis and Pre-implantation Diagnosis; 5 First Trimester Diagnosis; 6 Second Trimester Diagnosis; 7 Fetal Diagnosis by Ultrasound and Other Imaging; 8 Maternal Screening; 9 Screening for Carriers of Genetic Abnormality; 10 Technological Developments; 11 Confined Placental Mosaicism and Uniparental Disomy; 12 Molecular Cytogenetics; 13 Fetal Cells in Maternal Circulation; 14 Fetal Therapy; 15 Psychosocial Aspects; 16 Epidemiology and Environmental Factors; 17 Developmental Pathology. Within each section, articles are listed in alphabetical order with respect to author. If, in the preceding period, no publications are located relevant to any one of these headings, that section will be omitted 相似文献
90.
5p deletion syndrome commonly known as cri du chat is well described in affected neonates with catlike cry and hypotonia. Karyotyping will usually show a deletion of the short arm of one chromosome 5 with variable breakpoints. Only a few cases have been reported prenatally, and the fetal form of the syndrome has not been clearly individualised. We report a new case of 5p deletion syndrome diagnosed prenatally in association with Dandy–Walker syndrome and agenesis of the corpus callosum. Other brain anomalies have been reported previously, but this unusual association suggests the use of a specific probe in the investigation of these malformations. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献