全文获取类型
收费全文 | 13441篇 |
免费 | 127篇 |
国内免费 | 180篇 |
专业分类
安全科学 | 382篇 |
废物处理 | 684篇 |
环保管理 | 1683篇 |
综合类 | 1618篇 |
基础理论 | 4003篇 |
环境理论 | 3篇 |
污染及防治 | 3591篇 |
评价与监测 | 932篇 |
社会与环境 | 791篇 |
灾害及防治 | 61篇 |
出版年
2023年 | 52篇 |
2022年 | 128篇 |
2021年 | 111篇 |
2020年 | 76篇 |
2019年 | 112篇 |
2018年 | 248篇 |
2017年 | 238篇 |
2016年 | 381篇 |
2015年 | 227篇 |
2014年 | 308篇 |
2013年 | 923篇 |
2012年 | 547篇 |
2011年 | 622篇 |
2010年 | 457篇 |
2009年 | 520篇 |
2008年 | 598篇 |
2007年 | 615篇 |
2006年 | 552篇 |
2005年 | 805篇 |
2004年 | 869篇 |
2003年 | 804篇 |
2002年 | 416篇 |
2001年 | 552篇 |
2000年 | 362篇 |
1999年 | 213篇 |
1998年 | 156篇 |
1997年 | 153篇 |
1996年 | 152篇 |
1995年 | 179篇 |
1994年 | 143篇 |
1993年 | 119篇 |
1992年 | 132篇 |
1991年 | 134篇 |
1990年 | 140篇 |
1989年 | 137篇 |
1988年 | 102篇 |
1987年 | 89篇 |
1986年 | 71篇 |
1985年 | 98篇 |
1984年 | 96篇 |
1983年 | 93篇 |
1982年 | 91篇 |
1981年 | 80篇 |
1980年 | 68篇 |
1979年 | 72篇 |
1977年 | 55篇 |
1976年 | 52篇 |
1975年 | 55篇 |
1974年 | 55篇 |
1973年 | 57篇 |
排序方式: 共有10000条查询结果,搜索用时 93 毫秒
11.
12.
13.
Lee Fergusson Geoffrey Wells David Kettle 《Environment, Development and Sustainability》2018,20(4):1627-1649
The Jain tradition of ecological awareness and sustainability has been well documented over the last 25 years, although its roots lie deep in Indian history, specifically in texts such as the Tattvārtha Sūtra and ācārā?ga Sūtra. This traditional body of knowledge includes a long-standing theory and practice of personal, social and environmental sustainability, addressing such views as the interconnectedness of humans and the laws of nature, the interdependence of everything in the universe, the responsibility of humans to conserve and preserve natural resources, the avoidance of wanton and unnecessary waste generation, and a general aversion to mistreating or abusing the environment. These views encapsulate the lifestyles of some ten million people, including both mendicants and laity. Similarly, Maharishi Vedic Science, the systematic exploration and practical application of the Veda and Vedic Literature as taught by Maharishi Mahesh Yogi, makes a compelling case for establishing the unity of human life with nature and for promoting actions which guarantee both the protection of nature and protection by it. The purpose of this paper is to examine the relationship between the principles of sustainability in Jainism and the corresponding viewpoint of Maharishi Vedic Science, including supporting scientific evidence of its application, and to posit their contribution to a sustainable world future. 相似文献
14.
15.
16.
17.
18.
An up-flow biological anoxic filter (BANF) has been developed to achieve high removal performance of suspended solids and BOD removal as well as nitrogen. With a view to understand treatment mechanisms, we developed a filtration model that incorporates filtration, deposit scoring and biological reactions simultaneously. The biological reactions consist of four types of reaction; dissolution of organic particles; utilization of dissolved organic matter; denitrification; and self-degradation of bacteria. Whereas the reactor is generally assumed to be a plug flow reactor in the filtration model, it is assumed a continuous-flow stirred tank reactor (CSTR) in the model of biological reactions. The hydrodynamics is supposed that the filter bottom (the portion sludge settled) is a CSTR and the filter bed (the portion filled with filter media) consists of number of CSTR of equal size arranged in series. The model obtained in this study was verified and simulated using experimental results taken from a pilot-scale plant and predicted the experimental data well, applying to design and operate BANF. 相似文献
19.
Photocatalytic oxidation of gas-phase elemental mercury by nanotitanosilicate fibers 总被引:1,自引:0,他引:1
Photocatalytic fibers were generated from the continuous evaporation of titanium tetraisopropoxide with tetraethyl orthosilicate through a flame burner. The morphology, the crystal form, and the components of the nanotitanosilicate fibers were analyzed by Raman spectroscopy, Field emission-scanning electron microscope, X-ray diffraction, and Brunauer-Emmett-Teller surface area analysis. The nanotitanosilicates prepared by three different carrier gases (air, N(2), and Ar) were tested for their photocatalytic ability to remove/oxidize gas-phase elemental mercury. Under UV black light, the Hg(0) capture efficiencies were 78%, 86%, and 85% for air, N(2), and Ar, respectively. For air, the value was close to 90%, even under household fluorescent light. The Hg(0) capture efficiency by nanotitanosilcate was measured under fluorescent light, UV black light, and sunlight. 相似文献
20.
Frank Eierdanz Joseph Alcamo Lilibeth Acosta-Michlik Dörthe Krömker Dennis Tänzler 《Regional Environmental Change》2008,8(4):197-205
This paper presents the technical aspects of a new methodology for assessing the susceptibility of society to drought. The
methodology consists of a combination of inference modelling and fuzzy logic applications. Four steps are followed: (1) model
input variables are selected—these variables reflect the main factors influencing susceptibility in a social group, population
or region, (2) fuzzification—the uncertainties of the input variables are made explicit by representing them as ‘fuzzy membership
functions’, (3) inference modelling—the input variables are used to construct a model made up of linguistic rules, and (4)
defuzzification—results from the model in linguistic form are translated into numerical form, also through the use of fuzzy
membership functions. The disadvantages and advantages of this methodology became apparent when it was applied to the assessment
of susceptibility from three disciplinary perspectives: Disadvantages include the difficulty in validating results and the
subjectivity involved with specifying fuzzy membership functions and the rules of the inference model. Advantages of the methodology
are its transparency, because all model assumptions have to be made explicit in the form of inference rules; its flexibility,
in that informal and expert knowledge can be incorporated through ‘fuzzy membership functions’ and through the rules in the
inference model; and its versatility, since numerical data can be converted to linguistic statements and vice versa through
the procedures of ‘fuzzification’ and ‘defuzzification’. 相似文献