全文获取类型
收费全文 | 3831篇 |
免费 | 29篇 |
国内免费 | 48篇 |
专业分类
安全科学 | 118篇 |
废物处理 | 190篇 |
环保管理 | 438篇 |
综合类 | 696篇 |
基础理论 | 774篇 |
环境理论 | 4篇 |
污染及防治 | 1073篇 |
评价与监测 | 338篇 |
社会与环境 | 252篇 |
灾害及防治 | 25篇 |
出版年
2023年 | 41篇 |
2022年 | 110篇 |
2021年 | 131篇 |
2020年 | 66篇 |
2019年 | 61篇 |
2018年 | 128篇 |
2017年 | 127篇 |
2016年 | 152篇 |
2015年 | 99篇 |
2014年 | 153篇 |
2013年 | 219篇 |
2012年 | 181篇 |
2011年 | 231篇 |
2010年 | 159篇 |
2009年 | 169篇 |
2008年 | 169篇 |
2007年 | 181篇 |
2006年 | 120篇 |
2005年 | 161篇 |
2004年 | 206篇 |
2003年 | 188篇 |
2002年 | 136篇 |
2001年 | 106篇 |
2000年 | 52篇 |
1999年 | 49篇 |
1998年 | 36篇 |
1997年 | 39篇 |
1996年 | 32篇 |
1995年 | 40篇 |
1994年 | 29篇 |
1993年 | 17篇 |
1992年 | 23篇 |
1991年 | 24篇 |
1990年 | 24篇 |
1989年 | 18篇 |
1988年 | 13篇 |
1987年 | 13篇 |
1986年 | 18篇 |
1985年 | 19篇 |
1984年 | 20篇 |
1983年 | 20篇 |
1982年 | 13篇 |
1981年 | 10篇 |
1979年 | 11篇 |
1977年 | 5篇 |
1975年 | 5篇 |
1972年 | 5篇 |
1968年 | 5篇 |
1964年 | 4篇 |
1961年 | 4篇 |
排序方式: 共有3908条查询结果,搜索用时 250 毫秒
31.
José Roberto Ferreira 《Ambio-人类环境杂志》2003,32(1):47-51
引言 莫日-瓜苏河位于纳斯吉拉斯州,海拔高1450m.流淌470km后,该河流注入圣保罗州的帕尔杜河.其流域总面积为1400km2,其中有86%位于圣保罗州,包括一个工业化地区[1]. 相似文献
32.
Proost Stef Van Regemorter Denise 《Mitigation and Adaptation Strategies for Global Change》2004,9(4):453-473
In this paper we discuss the effects ofdifferent climate change policies onindustrial activity and on welfare. Wecompare the effects of carbon taxes andgrandfathered permits and the effects ofexemptions for energy-intensive industries.We survey first the insights from economictheory and from model experiments for theUS. Next we use a general equilibrium modelto assess the effect of different climatechange policies on industrial activity persector and per member country in the EU. Wepay particular attention to the effects ofpolicies where one EU member state exemptsits energy-intensive sectors from abatementefforts. The main findings are that, in theEU, the effects on industrial activity andthe welfare costs of tradable permits orcarbon taxes are small when no industrialsectors are exempted. When one membercountry exempts its energy intensivesector, this will reduce somewhat theimpact on its activity level but willgenerate an extra welfare cost for theEU. 相似文献
33.
M. R. Verschraegen-Spae N. Van Roy A. De Perdigo A. De Paepe F. Speleman 《黑龙江环境通报》1993,13(5):385-394
The nature and origin of two de novo small marker chromosomes found at prenatal diagnosis were determined by fluorescence in situ hybridization using chromosome centromere-specific probes and chromosome-specific plasmid libraries. One marker was found in a mosaic state and was shown to be an i(18p). The second marker was characterized as an inv dup(22). We conclude that molecular cytogenetic analysis contributes to the identification of marker chromosomes and therefore facilitates genetic counselling and decision-making for the parents. 相似文献
34.
35.
36.
M.?A.?de?FigueiredoEmail author D.?M.?Reiner H.?J.?Herzog 《Mitigation and Adaptation Strategies for Global Change》2005,10(4):647-657
This paper examines how legal standards of liability may apply to geologic carbon storage. The liability regime governing
geologic carbon storage will shape the technology's cost-effectiveness and overall attractiveness. We classify potential sources
of liability into operational, in situ, and climate liability. As a first step, we explore in situ liability in the United States. After summarizing legal standards of liability including negligence, breach of implied warranty,
strict liability, and product liability, we discuss how liability may be addressed at the level of the federal government,
state government, industry, and the firm. Finally, we address the implications of judicial treatment of liability for carbon
storage, including the apportionment of liability and the adequacy of current regulations. 相似文献
37.
The Science of Nature - Because of the sudden rise in primary-energy costs and the rapid inflation of plants which are used for the conversion of primary to secondary energy, the storage of energy,... 相似文献
38.
39.
Klaassien J. Ganzeveld Annechien van Hagen Martin H. van Agteren Wim de Koning Anton J. M. Schoot Uiterkamp 《Journal of Cleaner Production》1999,7(6):690
Two types of fermented organic waste (trade and industry waste and fruit and vegetable waste) were successfully used as a sole carbon source to produce poly-3-hydroxybutyrate-co-valerate (PHBV) by Ralstonia eutrophus (formerly Alcaligenes eutrophus) via oxygen limitation.The production of PHBV could be optimized by optimizing the oxygen transfer through the fermentor. Thereby, a peak concentration of 1.1 g PHBV per liter cell suspension, 40 w% of cell dry weight, was obtained at an aeration rate of 0.24 mol O2/h·kg biomass. The yield of PHBV on the fatty acid concentration in the organic waste was 0.16 g polymer/g volatile organic matter. The process obtained, compares well with the commercial production process of PHBV based on glucose. 相似文献
40.
B. Sikkema-Raddatz R. H. Sijmons M. B. Tan-Sindhunata A. Y. Van Der Veen R. Brunsting B. De Vries J. R. Beekhuis D. J. Bekedam B. Van Aken B. De Jong 《黑龙江环境通报》1995,15(5):467-473
We report two cases of apparently balanced complex de novo chromosomal rearrangements (BCCR) detected prenatally at 17 weeks and 10 weeks of gestation, respectively. Chromosomes were studied using GTG-banding and fluorescent in situ hybridization (FISH). In one case four chromosomes and in the other case three chromosomes were involved in the rearrangements. One of the pregnancies was terminated and no external or internal abnormalities were detected at autopsy. The other pregnancy continued to term. Level III ultrasound examination showed no abnormalities. The child is now 3 years old and has neither congenital anomalies nor evidence of delayed psychomotor development. 相似文献