全文获取类型
收费全文 | 564篇 |
免费 | 9篇 |
国内免费 | 8篇 |
专业分类
安全科学 | 28篇 |
废物处理 | 23篇 |
环保管理 | 87篇 |
综合类 | 110篇 |
基础理论 | 123篇 |
环境理论 | 1篇 |
污染及防治 | 146篇 |
评价与监测 | 45篇 |
社会与环境 | 15篇 |
灾害及防治 | 3篇 |
出版年
2023年 | 4篇 |
2022年 | 14篇 |
2021年 | 12篇 |
2020年 | 15篇 |
2019年 | 15篇 |
2018年 | 17篇 |
2017年 | 18篇 |
2016年 | 20篇 |
2015年 | 13篇 |
2014年 | 27篇 |
2013年 | 47篇 |
2012年 | 24篇 |
2011年 | 39篇 |
2010年 | 23篇 |
2009年 | 28篇 |
2008年 | 38篇 |
2007年 | 26篇 |
2006年 | 20篇 |
2005年 | 20篇 |
2004年 | 17篇 |
2003年 | 10篇 |
2002年 | 15篇 |
2001年 | 18篇 |
2000年 | 5篇 |
1999年 | 4篇 |
1998年 | 9篇 |
1997年 | 5篇 |
1995年 | 3篇 |
1994年 | 7篇 |
1993年 | 4篇 |
1991年 | 2篇 |
1989年 | 3篇 |
1986年 | 3篇 |
1983年 | 3篇 |
1967年 | 2篇 |
1963年 | 3篇 |
1962年 | 3篇 |
1961年 | 2篇 |
1960年 | 2篇 |
1959年 | 3篇 |
1956年 | 3篇 |
1954年 | 3篇 |
1946年 | 2篇 |
1930年 | 1篇 |
1929年 | 1篇 |
1926年 | 2篇 |
1924年 | 1篇 |
1921年 | 1篇 |
1916年 | 3篇 |
1915年 | 1篇 |
排序方式: 共有581条查询结果,搜索用时 156 毫秒
1.
2.
3.
Rose Adam Zhang Zhong Xiang 《Mitigation and Adaptation Strategies for Global Change》2004,9(4):477-500
Emissions trading is anattractive candidate for implementinggreenhouse gas mitigation, because it canpromote both efficiency and equity. Thispaper analyzes the interregional impacts ofalternative allocations of carbon dioxideemission permits within the U.S. Theanalysis is performed with the aid of anonlinear programming model for ten EPARegions and for six alternative permitdistribution formulas. The reason thatvarious alternatives need to be consideredis that there is no universal consensus onthe best definition of equity. Advanceknowledge of absolute and relative regionaleconomic impacts provides policy-makerswith a stronger basis for making thechoice. The analysis yields several usefulresults. First, the simulations indicatethat no matter how permits are allocated,this policy instrument can substantiallyreduce the cost of GHG mitigation for theU.S. in comparison to a system of fixedquotas for each of its regions. Interestingly, the welfare impacts ofseveral of the allocation formulas differonly slightly despite the large differencesin their philosophical underpinnings. Also, the results for some equity criteriadiffer greatly from their application inthe international domain. For example, theEgalitarian (per capita) criterion resultsin the relatively greatest cost burdenbeing incurred by one of the regions of theU.S. with the lowest per capita income. 相似文献
4.
Amniocentesis and subsequent tests are reported on a fetus conceived of a rare mating type: its mother has an intermediate level of β hexosaminidase A (HEX A), characteristic of carriers of Tay-Sachs disease (TSD), while the father suffers from an adult-onset GM2 ganglio-sidosis (AOG) with severe HEX A deficiency. Activity of HEX A in the cultured fetal cells was very low when measured by the heat-inactivation method, thus showing the typical biochemical phenotype of TSD fetuses. However, upon separation of HEX isozymes by ion exchange chromatography, residual HEX A (17 per cent of total HEX) was demonstrated. Also in contrast to TSD fetuses, this fetus' fibroblasts were able to synthesize the precursor of a chains of HEX, and ultrastructural examination of its brain revealed few atypical lamellar bodies, unlike those found in TSD fetuses of the same gestational age. It is therefore concluded that the fetus was not affected with TSD, but rather with AOG. 相似文献
5.
6.
7.
Kenneth E. Hyer Douglas L. Mayer 《Journal of the American Water Resources Association》2004,40(6):1511-1526
ABSTRACT: Surface water impairment by fecal coliform bacteria is a water quality issue of national scope and importance. In Virginia, more than 400 stream and river segments are on the Commonwealth's 2002 303(d) list because of fecal coliform impairment. Total maximum daily loads (TMDLs) will be developed for most of these listed streams and rivers. Information regarding the major fecal coliform sources that impair surface water quality would enhance the development of effective watershed models and improve TMDLs. Bacterial source tracking (BST) is a recently developed technology for identifying the sources of fecal coliform bacteria and it may be helpful in generating improved TMDLs. Bacterial source tracking was performed, watershed models were developed, and TMDLs were prepared for three streams (Accotink Creek, Christians Creek, and Blacks Run) on Virginia's 303(d) list of impaired waters. Quality assurance of the BST work suggests that these data adequately describe the bacteria sources that are impairing these streams. Initial comparison of simulated bacterial sources with the observed BST data indicated that the fecal coliform sources were represented inaccurately in the initial model simulation. Revised model simulations (based on BST data) appeared to provide a better representation of the sources of fecal coliform bacteria in these three streams. The coupled approach of incorporating BST data into the fecal coliform transport model appears to reduce model uncertainty and should result in an improved TMDL. 相似文献
8.
Michael Greenberg Joanna Burger Michael Gochfeld David Kosson Karen Lowrie Henry Mayer Charles W. Powers Conrad D. Volz Vikram Vyas 《补救:环境净化治理成本、技术与工艺杂志》2005,16(1):91-105
This article discusses creating a sustainably protective engineered and human management system in perpetuity for sites with long‐lived radiological and chemical hazards. This is essential at this time because the federal government is evaluating its property as assets and attempting to reduce its holdings, while seeking to assure that health and ecosystems are not put at risk. To assist those who have a stake in the remediation, management, and stewardship of these and analogous privately owned sites, this article discusses current end‐state planning by reviewing the federal government's accelerated efforts to reduce its footprint and how those efforts relate to sustainability. The article also provides a list of questions organized around six elements of risk management and primary, secondary, and tertiary disease and injury prevention. Throughout the article, the U.S. Department of Energy (DOE) is used as an example of an organization that seeks to reduce its footprint, manage its budget, and be a steward of the sites that it is responsible for. However, the approach and questions are appropriate for land controlled by the Department of Defense (DOD), the General Services Administration (GSA), and other public and private owners of sites with residual contamination. © 2005 Wiley Periodicals, Inc. 相似文献
9.
Hawrot-Paw Małgorzata Koniuszy Adam Mikiciuk Małgorzata Izwikow Monika Stawicki Tomasz Sędłak Paweł 《Environmental science and pollution research international》2017,24(17):15022-15030
Environmental Science and Pollution Research - The purpose of this research was evaluation of the effect of soil contamination with waste coming from biomass gasification on chosen indicators of... 相似文献
10.