全文获取类型
收费全文 | 16224篇 |
免费 | 204篇 |
国内免费 | 284篇 |
专业分类
安全科学 | 414篇 |
废物处理 | 702篇 |
环保管理 | 1849篇 |
综合类 | 2828篇 |
基础理论 | 4464篇 |
环境理论 | 4篇 |
污染及防治 | 4227篇 |
评价与监测 | 1100篇 |
社会与环境 | 1010篇 |
灾害及防治 | 114篇 |
出版年
2022年 | 182篇 |
2021年 | 137篇 |
2020年 | 145篇 |
2019年 | 140篇 |
2018年 | 221篇 |
2017年 | 269篇 |
2016年 | 387篇 |
2015年 | 306篇 |
2014年 | 510篇 |
2013年 | 1259篇 |
2012年 | 536篇 |
2011年 | 748篇 |
2010年 | 648篇 |
2009年 | 620篇 |
2008年 | 706篇 |
2007年 | 748篇 |
2006年 | 614篇 |
2005年 | 540篇 |
2004年 | 537篇 |
2003年 | 518篇 |
2002年 | 506篇 |
2001年 | 658篇 |
2000年 | 490篇 |
1999年 | 261篇 |
1998年 | 177篇 |
1997年 | 207篇 |
1996年 | 210篇 |
1995年 | 239篇 |
1994年 | 238篇 |
1993年 | 183篇 |
1992年 | 197篇 |
1991年 | 186篇 |
1990年 | 206篇 |
1989年 | 193篇 |
1988年 | 153篇 |
1987年 | 162篇 |
1986年 | 156篇 |
1985年 | 157篇 |
1984年 | 149篇 |
1983年 | 142篇 |
1982年 | 126篇 |
1981年 | 121篇 |
1980年 | 115篇 |
1979年 | 124篇 |
1978年 | 102篇 |
1977年 | 113篇 |
1975年 | 87篇 |
1974年 | 88篇 |
1973年 | 98篇 |
1972年 | 86篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
431.
P. A. Zadubrovskiy I. V. Zadubrovskaya M. A. Potapov O. F. Potapova V. I. Evsikov 《Russian Journal of Ecology》2016,47(1):82-87
Demographic structure and its seasonal dynamics have been studied in colonies of narrow-skulled voles (Lasiopodomys gregalis Pall.) in Northern Kulunda. Three types of colonies have been distinguished: (I) true colonies (large, complex families), (II) simple families (nuclear or incomplete), and (III) all-male colonies. Changes in their sex, age, and functional composition (based on animal migration activity) during the breeding season have been analyzed. 相似文献
432.
Bioanalytical screening methods for dioxins and dioxin-like compounds a review of bioassay/biomarker technology. 总被引:17,自引:0,他引:17
Determination of environmental pollutants utilizing biodetectors such as bioassays, biomarkers, enzyme immunoassays (EIAs), or other bioanalytical tools is a continuously growing area. The present literature review describes the principles and advantages/limitations of several bioanalytical detection methods (BDMs) for the screening and diagnosis of dioxin and dioxin-like compounds. This study characterizes briefly the family of dioxin and dioxin-like compounds, discusses potential Ah receptor (AhR) ligands and cytochrome P-450 (CYP) 1A1-enzyme-inducing compounds. 'Milestones' in the development of BDMs are summarized and explained in detail for a number of bioanalytical tools that can be used to detect these classes of dioxin-like persistent bioaccumulative toxicants (PBTs). The design of a screening profile with a battery of bioassays/biomarkers coupled with the chemical analysis is evaluated. The relative potencies (REPs) to 2,3,7,8-TCDD for dioxin-like compounds are reviewed for various BDMs and the differences are noted. 相似文献
433.
Analysis of microcystins in cyanobacteria blooms and surface water samples from Meiliang Bay,Taihu Lake,China 总被引:18,自引:0,他引:18
Shen PP Shi Q Hua ZC Kong FX Wang ZG Zhuang SX Chen DC 《Environment international》2003,29(5):641-647
Taihu Lake is the third largest freshwater lake in China. In recent years, the water pollution of cyanobacteria blooms has become a severe problem in this area. Microcystins (MCs) are an important group of toxic compounds mainly produced by some cyanobacteria species and have both acute and chronic hepatotoxic effects on animals and humans. This paper presents the first data on the identification and detection of MCs in both natural occurring cyanobacteria blooms and surface water samples (0-0.5 m), collected from Meiliang Bay, Taihu Lake, China. A conventional method for extraction and isolation of MCs from cyanobacteria blooms was applied. High-performance liquid chromatography (HPLC) analysis showed that the main toxic component in the cyanobacteria materials was MC-LR. The monoclonal antibody (mAb) against MC-LR produced by hybridoma technique was employed for direct competitive ELISA to detect the concentrations of MCs in bloom and water samples collected in 2001. The results not only revealed the presence of MCs but also temporal variations of MCs levels of three sampling stations in Meiliang Bay in 1 year. It is obvious that the MC contents were relatively higher during warm months and related with the status of eutrophication. Our study indicates the threat associated with MCs in water body of Taihu Lake. To prevent the MCs potential hazard on public health in this area, some necessary measures of monitoring and control of growth of cyanobacteria are urgently needed. 相似文献
434.
Fortunati P Brambilla M Speroni F Carini F 《Journal of environmental radioactivity》2004,71(2):187-199
In this paper a study of the foliar uptake and translocation of 134Cs and 85Sr in a herbaceous fruit plant is presented. In particular, absorption, translocation and loss of these radionuclides in strawberry plants have been studied in relation to the age of contaminated leaves. Strawberry plants were contaminated by distributing droplets of an aqueous solution containing 134CsCl and 85SrCl2 on the surface of two leaves per plant. One half of the plants was contaminated through two young leaves, a second half through two old leaves. Sets of plants were collected 1 day, 7 days and 15 days after contamination. One half of them was rinsed with double distilled water before gamma analysis. Rinsing contaminated leaves removes on average 55% of the applied 134Cs and 45% of 85Sr. The activity removed decreases during the 15 days of the experimental study, both for 134Cs and for 85Sr, suggesting an increase in foliar absorption during this period. The activity removed does not differ between old and young leaves. "External loss" is lower for young than old contaminated leaves. "Internal loss" through translocation occurs mainly for 134Cs. Translocation coefficients from contaminated leaves to fruits are two orders of magnitude higher for 134Cs (4.0%), than for 85Sr (0.05%). Leaf to fruit translocation coefficients for 134Cs are higher from young leaves (5.8%), than from old leaves (2.3%). 相似文献
435.
Le Nguyen Truc Thinh Nguyen An Ha Nguyen Thi Vinh Tien Nguyen Dinh Lam Nguyen Duc Hong Nguyen Van Tuan Nguyen Tat Hanh Ta Van Khanh Nguyen Ngoc Thanh Nguyen Ngoc Hens Luc 《Environment, Development and Sustainability》2022,24(10):12427-12445
Environment, Development and Sustainability - The recent growth of agriculture, industry and urban areas in Vietnam requires a large amount of water consumption as a production factor. This paper... 相似文献
436.
David A. P. Paterson Winifred Ijomah James F. C. Windmill 《International Journal of Sustainable Engineering》2016,9(2):130-140
While many studies and reviews into the practices conducted by industry and academia to recycle and remanufacture carbon fibre-reinforced plastic (CFRP) exist, to date no investigation exists which regards the correctness of the use of the terms recycling and remanufacturing. As such, this paper seeks to analyse the CFRP reuse industry’s attempt to recycle and remanufacture manufacturing waste CFRP and end-of-life (EOL) CFRP with an emphasis on the terminology used to describe these practices. Firstly, this paper presents a justification of the importance of using EOL terminology correctly; outlining the benefits and problems associated with using the correct and incorrect terminology. This paper finds that in the case of CFRP remanufacturing, terminology is being applied incorrectly and in the case of CFRP recycling, particular care should be taken when applying the term recycled to CFRP or stating that CFRP has been recycled. Further, this paper proposes new terminology (in keeping with EU directives) which could be adopted by industry and academia working in this area. This paper also finds that in the case of remanufacture, CFRP is incapable of being remanufactured. 相似文献
437.
438.
The use of coefficients, derived from cross-sectional mortality studies, for air pollution risk assessment is quite controversial. In this study, the major limitations of cross-sectional studies are reviewed. The consistency of results from the major recent cross-sectional studies is examined, and the sensitivity of results to model specification is analyzed. Finally, the implications for risk assessment of our inquiries are discussed. 相似文献
439.
淀山湖上覆水与沉积物孔隙水中重金属的分布特征 总被引:6,自引:0,他引:6
研究了淀山湖上覆水和沉积物孔隙水中Pb ,Cd,Cr,Cu ,Fe和Mn的浓度及Eh 分布 ,分析了孔隙水中重金属的扩散通量 .结果表明 ,淀山湖中重金属的浓度由高到低依次为 :Mn >Fe >Cr,Cu ,Pb >Cd ;Fe和Mn在孔隙水中的浓度远远大于它们在上覆水中的浓度 ,表层沉积物孔隙水中Pb ,Cd ,Cr,Cu的浓度稍大于它们在上覆水中的浓度 ;沉积物中的重金属可能按照浓度梯度经孔隙水从沉积物向上覆水中扩散而最终影响上覆水的水质 相似文献
440.
N. Speybroeck P. J. Lindsey M. Billiouw M. Madder J. K. Lindsey D. L. Berkvens 《Environmental and Ecological Statistics》2006,13(1):69-87
This paper presents statistical methodology to analyze longitudinal binary responses for which a sudden change in the response
occurs in time. Probability plots, transition matrices, and change-point models and more advanced techniques such as generalized
auto-regression models and hidden Markov chains are presented and applied on a study on the activity of Rhipicephalus appendiculatus, the major vector of Theileria parva, a fatal disease in cattle. This study presents individual measurements on female R. appendiculatus, which are terminating their diapause (resting status) and become active. Comprehending activity patterns is very important
to better understand the ecology of R. appendiculatus. The model indicates that activity and non-activity act in an absorbing way meaning that once a tick becomes active it shows
a tendency to remain active. The change-point model estimates that the sudden change in activity happens on December 10. The
reaction of ticks on acceleration and changes in rainfall and temperature indicates that ticks can sense climatic changes.
The study revealed the underlying not visually observable states during diapause development of the adult tick of R. appendiculatus. These states could be related to phases during the dynamic event of diapause development and post-diapause activity in R. appendiculatus. 相似文献