全文获取类型
收费全文 | 12689篇 |
免费 | 125篇 |
国内免费 | 96篇 |
专业分类
安全科学 | 391篇 |
废物处理 | 474篇 |
环保管理 | 1763篇 |
综合类 | 2202篇 |
基础理论 | 3303篇 |
环境理论 | 8篇 |
污染及防治 | 3196篇 |
评价与监测 | 811篇 |
社会与环境 | 673篇 |
灾害及防治 | 89篇 |
出版年
2023年 | 69篇 |
2022年 | 108篇 |
2021年 | 111篇 |
2020年 | 86篇 |
2019年 | 107篇 |
2018年 | 177篇 |
2017年 | 168篇 |
2016年 | 246篇 |
2015年 | 211篇 |
2014年 | 286篇 |
2013年 | 930篇 |
2012年 | 396篇 |
2011年 | 549篇 |
2010年 | 441篇 |
2009年 | 518篇 |
2008年 | 560篇 |
2007年 | 559篇 |
2006年 | 488篇 |
2005年 | 458篇 |
2004年 | 389篇 |
2003年 | 385篇 |
2002年 | 380篇 |
2001年 | 493篇 |
2000年 | 368篇 |
1999年 | 232篇 |
1998年 | 142篇 |
1997年 | 163篇 |
1996年 | 173篇 |
1995年 | 200篇 |
1994年 | 209篇 |
1993年 | 171篇 |
1992年 | 139篇 |
1991年 | 175篇 |
1990年 | 174篇 |
1989年 | 165篇 |
1988年 | 120篇 |
1987年 | 120篇 |
1986年 | 120篇 |
1985年 | 93篇 |
1984年 | 112篇 |
1983年 | 114篇 |
1982年 | 123篇 |
1981年 | 113篇 |
1980年 | 102篇 |
1979年 | 117篇 |
1978年 | 77篇 |
1977年 | 79篇 |
1975年 | 79篇 |
1973年 | 75篇 |
1972年 | 68篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
251.
252.
Pushpendra Koli Braj B. Singh Jitendra Kumar Deeba Kamil 《Journal of environmental science and health. Part. B》2013,48(9):674-681
Controlled release nanoformulations of carbendazim (Methyl 1H-benzimidazol-2-ylcarbamate), a systemic fungicide, have been prepared using laboratory synthesized poly(ethylene glycols) (PEGs)-based functionalized amphiphilic copolymers. The release kinetics of carbendazim from developed controlled release (CR) formulations was studied and compared with that of the commercially available 50% Wettable Powder (WP). Further, the bioefficacy evaluation of developed formulations was done against plant pathogenic fungi Rhizoctonia solani by the poison food technique method. The release of maximum amount of carbendazim from developed formulations was dependent on the molecular weight of PEGs and was found to increase with increasing molecular weights. The range of carbendazim release was found to be between 10th to 35th day as compared to commercial formulation which was up to 7th day. The diffusion exponent (n value) of carbendazim in water ranged from 0.37 to 0.52 in the tested formulations. The half-release (t1/2) values ranged between 9.47 and 24.20 days, and the period of optimum availability (POA) of carbendazim ranged from 9.15 to 26.63 days. Also, ED50 values of the developed formulations vary from 0.40 to 0.74 mg L?1. These formulations can be used to optimize the release of carbendazim to achieve disease control for the desired period depending on the matrix of the polymer used. 相似文献
253.
F. Pacifico S.P. Harrison C.D. Jones S. Sitch 《Atmospheric environment (Oxford, England : 1994)》2009,43(39):6121-6135
Biogenic volatile organic compounds (BVOCs) play an important role in atmospheric chemistry and the carbon cycle. Isoprene is quantitatively the most important of the non-methane BVOCs (NMBVOCs), with an annual emission of about 400–600 TgC; about 90% of this is emitted by terrestrial plants. Incorporating a mechanistic treatment of isoprene emissions within land-surface schemes has recently become a focus for the modelling community, the aim being to quantify the potential magnitude of associated climate feedbacks. However, these efforts are hampered by major uncertainties about why plants emit isoprene and the relative importance of different environmental controls on isoprene emission. The availability and reliability of observations of isoprene fluxes from different types of vegetation is limited, and this also imposes constraints on model development. Nevertheless, progress is being made towards the development of mechanistic models of isoprene emission which, in conjunction with atmospheric chemistry models, will ultimately allow improved quantification of the feedbacks between the terrestrial biosphere and climate under past and future climate states. 相似文献
254.
255.
REED F. NOSS ERICA FLEISHMAN† DOMINICK A. DELLASALA‡ JOHN M. FITZGERALD§ MART R. GROSS MARTIN B. MAIN†† FIONA NAGLE‡‡ STACEY L. O'MALLEY JON ROSALES§§ 《Conservation biology》2009,23(4):825-833
Abstract: The Society for Conservation Biology (SCB) can enhance conservation of biodiversity in North America by increasing its engagement in public policy. Toward this end, the North America Section of SCB is establishing partnerships with other professional organizations in order to speak more powerfully to decision makers and taking other actions—such as increasing interaction with chapters—geared to engage members more substantively in science-policy issues. Additionally, the section is developing a North American Biodiversity Blueprint, which spans the continental United States and Canada and is informed by natural and social science. This blueprint is intended to clarify the policy challenges for protecting continental biodiversity, to foster bilateral collaboration to resolve common problems, and to suggest rational alternative policies and practices that are more likely than current practices to sustain North America's natural heritage. Conservation scientists and practitioners can play a key role by drawing policy makers' attention to ultimate, as well as proximate, causes of biodiversity decline and to the ecological and economic consequences of not addressing these threats. 相似文献
256.
Derek Vollmer Maíra Ometto Bezerra Natalia Acero Martínez Octavio Rodríguez Ortiz Ivo Encomenderos Maria Clara Marques Lina Serrano-Durn Isabelle Fauconnier Raymond Yu Wang 《Ambio》2021,50(4):870
Quantitative assessments have long been used to evaluate the condition of the natural environment, providing information for standard setting, adaptive management, and monitoring. Similar approaches have been developed to measure environmental governance, however, the end result (e.g., numeric indicators) belies the subjective and normative judgments that are involved in evaluating governance. We demonstrate a framework that makes this information transparent, through an application of the Freshwater Health Index in three different river basins in Latin America. Water Governance is measured on a 0–100 scale, using data derived from perception-based surveys administered to stakeholders. Results suggest that water governance is a primary area of concern in all three places, with low overall scores (Guandu-26, Alto Mayo-38, Bogotá-43). We conclude that this approach to measuring governance at the river basin scale provides valuable information to support monitoring and decision making, and we offer suggestions on how it can be improved.Electronic supplementary materialThe online version of this article (10.1007/s13280-020-01407-8) contains supplementary material, which is available to authorized users. 相似文献
257.
Vega-Millán Christian B. Dévora-Figueroa Ana G. Burgess Jefferey L. Beamer Paloma I. Furlong Melissa Lantz R. Clark Meza-Figueroa Diana O´Rourke Mary Kay García-Rico Leticia Meza-Escalante Edna R. Balderas-Cortés José J. Meza-Montenegro Maria M. 《Environmental science and pollution research international》2021,28(26):34355-34366
Environmental Science and Pollution Research - Environmental arsenic exposure in adults and children has been associated with a reduction in the expression of club cell secretory protein (CC16) and... 相似文献
258.
Adewuyi Adeolu O. Awodumi Olabanji B. 《Environmental science and pollution research international》2021,28(12):14434-14468
Environmental Science and Pollution Research - Simultaneous achievement of sustainable development goals (SDGs), especially energy efficiency (SDG 7), economic growth (SDG 8), and pollution... 相似文献
259.
Environmental Science and Pollution Research - Data (N = 11614) from National Health and Nutrition Examination Survey (NHANES) for 1999–2016 for US adults aged ≥ 20 years were analyzed... 相似文献
260.
Londhe Priyanka Athawale Anjali Chaure Nandu B. 《Environmental science and pollution research international》2021,28(4):3928-3941
Environmental Science and Pollution Research - ZnO and ZnO:Al thin films have been successfully synthesized by simple solution processable method at low temperature. Highly crystalline (002)... 相似文献