全文获取类型
收费全文 | 5484篇 |
免费 | 47篇 |
国内免费 | 65篇 |
专业分类
安全科学 | 186篇 |
废物处理 | 203篇 |
环保管理 | 612篇 |
综合类 | 1260篇 |
基础理论 | 1186篇 |
环境理论 | 5篇 |
污染及防治 | 1190篇 |
评价与监测 | 380篇 |
社会与环境 | 552篇 |
灾害及防治 | 22篇 |
出版年
2023年 | 29篇 |
2022年 | 75篇 |
2021年 | 96篇 |
2020年 | 57篇 |
2019年 | 61篇 |
2018年 | 109篇 |
2017年 | 121篇 |
2016年 | 191篇 |
2015年 | 109篇 |
2014年 | 205篇 |
2013年 | 447篇 |
2012年 | 203篇 |
2011年 | 280篇 |
2010年 | 197篇 |
2009年 | 237篇 |
2008年 | 233篇 |
2007年 | 259篇 |
2006年 | 195篇 |
2005年 | 168篇 |
2004年 | 149篇 |
2003年 | 168篇 |
2002年 | 146篇 |
2001年 | 154篇 |
2000年 | 110篇 |
1999年 | 79篇 |
1998年 | 38篇 |
1997年 | 47篇 |
1996年 | 34篇 |
1995年 | 64篇 |
1994年 | 45篇 |
1993年 | 43篇 |
1992年 | 45篇 |
1991年 | 41篇 |
1990年 | 55篇 |
1989年 | 43篇 |
1988年 | 30篇 |
1987年 | 35篇 |
1986年 | 24篇 |
1985年 | 32篇 |
1984年 | 31篇 |
1983年 | 46篇 |
1982年 | 29篇 |
1981年 | 43篇 |
1980年 | 31篇 |
1979年 | 31篇 |
1977年 | 25篇 |
1976年 | 28篇 |
1975年 | 26篇 |
1970年 | 24篇 |
1966年 | 24篇 |
排序方式: 共有5596条查询结果,搜索用时 15 毫秒
1.
Russian Journal of Ecology - The dynamics of the species richness, breeding density, and structure of the community of birds occupying nest-boxes upon a 50-fold reduction of atmospheric emissions... 相似文献
2.
Kalan Mohammad Ebrahimi Ghobadi Hassan Taleb Ziyad Ben Adham Davoud Cobb Caroline O Ward Kenneth D Behaleh Raed Fazlzadeh Mehdi 《Environmental science and pollution research international》2021,28(30):40346-40354
Environmental Science and Pollution Research - There is mixed evidence surrounding the relationship between tobacco use and COVID-19 infection/progression. The current study investigates beliefs... 相似文献
3.
The discovery of ordered mesoporous materials in 1992 by Mobil Oil Corporation scientists has opened great opportunities for new applications in many emerging fields such as heterogeneous catalysis, biocatalysis, energy conversion, biosensors, photocatalytic devices and environmental technologies. Porous materials are grouped by the International Union of Pure and Applied Chemistry (IUPAC) into three classes according to their pore diameter: microporous (<?2 nm), mesoporous (2–50 nm) and macroporous (>?50 nm). One of the most versatile methods for the preparation of those materials is the soft template approach which combines the sol–gel process with molecular self-assembly. While the micelles formed by ionic or nonionic surfactants, as well as amphiphilic polymers, have been extensively used as templates, the supramolecular assemblies formed between cyclodextrins and block copolymers have been less investigated, despite their large chemical and structural diversity. This review article focuses mainly on nanostructured porous inorganic materials derived from cyclodextrins or cyclodextrin-based assemblies. More than 100 references are described and discussed, in which we look both at their synthesis and characterization, as well as their applications in the emerging fields of heterogeneous catalysis and photocatalysis. A special attention is paid to the evaluation of the critical parameters that need to be controlled for improving their (photo) catalytic performances. 相似文献
4.
5.
6.
Erica Marshall Roozbeh Valavi Louise O’ Connor Natasha Cadenhead Darren Southwell Brendan A. Wintle Heini Kujala 《Conservation biology》2021,35(2):567-577
Developers are often required by law to offset environmental impacts through targeted conservation actions. Most offset policies specify metrics for calculating offset requirements, usually by assessing vegetation condition. Despite widespread use, there is little evidence to support the effectiveness of vegetation-based metrics for ensuring biodiversity persistence. We compared long-term impacts of biodiversity offsetting based on area only; vegetation condition only; area × habitat suitability; and condition × habitat suitability in development and restoration simulations for the Hunter Region of New South Wales, Australia. We simulated development and subsequent offsetting through restoration within a virtual landscape, linking simulations to population viability models for 3 species. Habitat gains did not ensure species persistence. No net loss was achieved when performance of offsetting was assessed in terms of amount of habitat restored, but not when outcomes were assessed in terms of persistence. Maintenance of persistence occurred more often when impacts were avoided, giving further support to better enforce the avoidance stage of the mitigation hierarchy. When development affected areas of high habitat quality for species, persistence could not be guaranteed. Therefore, species must be more explicitly accounted for in offsets, rather than just vegetation or habitat alone. Declines due to a failure to account directly for species population dynamics and connectivity overshadowed the benefits delivered by producing large areas of high-quality habitat. Our modeling framework showed that the benefits delivered by offsets are species specific and that simple vegetation-based metrics can give misguided impressions on how well biodiversity offsets achieve no net loss. 相似文献
7.
8.
Anne DePiante Henriksen 《补救:环境净化治理成本、技术与工艺杂志》1997,7(3):39-61
This article illustrates how two different decision analysis (DA) methods can be used to assist in making environmental remediation decisions. The two DA methods are Multiattribute Utility Theory (MAUT) and the Analytic Hierarchy Process (AHP). MAUT and AHP differ greatly in their underlying philosophies. MAUT employs an interval scale and constructs utility functions that quantify the total utility to the decision maker of each technology alternative; AHP employs a ratio scale and uses pairwise comparisons to produce a final ranking of the alternatives that reflects the decision maker's comparative preferences. In this study, the same technology was ranked first by both methods; however, the remaining rankings did not agree. Also, statistical analysis indicated that some score differences may be statistically insignificant. These results are presented and discussed along with a comparison of the features, advantages, and disadvantages of these two DA approaches. 相似文献
9.
Pocillopora damicornis (Linnaeus) is a ubiquitous branching coral found throughout the Indo-Pacific region. Like many other species of coral, P. damicornis displays a large range of morphologies. At One Tree Island, it occurs as two distinct morphs that are easily distinguished by the presence or absence of pink pigmentation. The two colour morphs of P. damicornis were found to differ in their distribution and abundance in the One Tree Island Lagoon. The brown morph was more abudant than the pink morph in the shallows (<1 m),whereas the pink morph was more abundant at deeper sites (>3 m). The two morphs also differed physiologically. The brown morph tended to have a greater calcification rate than the pink morph, regardless of environmental conditions. However, the difference in the calcification rate between the two morphs became non-significant under shaded conditions (5% full sunlight), indicating some degree of physiological plasticity of the morphs. The pink colour in P. damicornis was due to a hydrophilic pigment with a major peak absorbance at 560 nm. The expression of pink pigment had both genetic and phenotypic components. The brown morph has a reduced genetic capacity to express the pigment relative to the pink morph. On the other hand, pigment expression could be induced by light in the pink morph. Although genetic differences ultimately determine the differences between the two morphs of P. damicornis, the extent of pigment expression is under some degree of environmental influence. 相似文献
10.