全文获取类型
收费全文 | 3682篇 |
免费 | 62篇 |
国内免费 | 33篇 |
专业分类
安全科学 | 209篇 |
废物处理 | 122篇 |
环保管理 | 949篇 |
综合类 | 354篇 |
基础理论 | 891篇 |
环境理论 | 7篇 |
污染及防治 | 832篇 |
评价与监测 | 250篇 |
社会与环境 | 133篇 |
灾害及防治 | 30篇 |
出版年
2023年 | 18篇 |
2022年 | 28篇 |
2021年 | 34篇 |
2020年 | 27篇 |
2019年 | 36篇 |
2018年 | 44篇 |
2017年 | 73篇 |
2016年 | 93篇 |
2015年 | 75篇 |
2014年 | 91篇 |
2013年 | 473篇 |
2012年 | 134篇 |
2011年 | 180篇 |
2010年 | 126篇 |
2009年 | 137篇 |
2008年 | 158篇 |
2007年 | 197篇 |
2006年 | 140篇 |
2005年 | 119篇 |
2004年 | 124篇 |
2003年 | 129篇 |
2002年 | 109篇 |
2001年 | 64篇 |
2000年 | 79篇 |
1999年 | 50篇 |
1998年 | 56篇 |
1997年 | 45篇 |
1996年 | 61篇 |
1995年 | 58篇 |
1994年 | 64篇 |
1993年 | 52篇 |
1992年 | 47篇 |
1991年 | 41篇 |
1990年 | 38篇 |
1989年 | 31篇 |
1988年 | 40篇 |
1987年 | 32篇 |
1986年 | 34篇 |
1985年 | 34篇 |
1984年 | 30篇 |
1983年 | 38篇 |
1982年 | 50篇 |
1981年 | 47篇 |
1980年 | 25篇 |
1979年 | 28篇 |
1978年 | 25篇 |
1977年 | 29篇 |
1976年 | 13篇 |
1974年 | 10篇 |
1972年 | 11篇 |
排序方式: 共有3777条查询结果,搜索用时 0 毫秒
71.
Robert E. Kunkle 《Journal of the Air & Waste Management Association (1995)》2013,63(6):274-277
The feasibility of open burning under selected meteorological conditions is discussed. Meteorological provisos and nonmeteorological factors are enumerated. Topics discussed include: combustion, fuel moisture, fire hazard, forecasting, fallout and odor, and air pollution potential. A mathematical estimate of visibility reduction is described and evaluated. A procedure for estimating atmospheric ventilation is presented. The author concludes that most massive open fires result in adverse effects on either a local or areawide scale. Hence, the best meteorological decision possible is frequently one that minimizes one scale of effect at the expense of the other. 相似文献
72.
The photochemical reaction of various olefins and nitrogen dioxide was studied under conditions of controlled temperature, pressure, and humidity in a 200 liter stirred glass reactor. The hydrocarbon concentration in the reactor during four and five hour irradiation periods was monitored with a flame ionization chromatograph. Reaction rate constants, based on three consecutive first order reactions, were calculated for reactor temperatures of 20, 25, 30, and 35 degrees centigrade. Activation energies for the three consecutive reactions were calculated from the Arrhenius equation. Branched and straight chain olefins were studied at initial concentrations of 5.0 to 10.0 parts per million.s 相似文献
73.
74.
75.
76.
Robert A. O'Dell Mansoor Taheri Robert L. Kabel 《Journal of the Air & Waste Management Association (1995)》2013,63(11):1104-1109
A mass transfer approach is used in developing a practical mathematical model of gaseous pollutant uptake by leaves in which a series of resistances is summed across a concentration difference. The body of information presented in this paper is directed to plant pathologists or physiologists in the field of vegetal-pollutant effects and to people interested in the natural removal of air pollutants by vegetation. Correlations are given to calculate the aerodynamic and the stomatal resistances to uptake, while both a qualitative investigation and quantitative estimates are made of the mesophyllic resistance. The factors which control the aerodynamic resistance, ra, are leaf size and wind speed, while the leaf physiology is the determinant of the stomatal resistance, rs . It is noted that the chemical reaction rate and pollutant diffusivity in the mesophyll control the mesophyllic resistance, rm, though the overall gas phase mesophyllic resistance, Hrm, is strongly a function of pollutant solubility in water. Finally, the overall model is compared to earlier experimental work on vegetal uptake of SO2. 相似文献
77.
Robert W. McMullen 《Journal of the Air & Waste Management Association (1995)》2013,63(10):1057-1058
Calculations of pollutant concentrations at various downwind and crosswind distances from an elevated point source are frequently based on diffusion models and parameter values contained in Turner’s Workbook of Atmospheric Dispersion Estimates.1 These calculations can be made much more speedily on a computer or on a currentgeneration, programmable desk calculator, if the values of the horizontal and vertical standard deviations of plume concentrations distributions are stated explicitly as a mathematical function of downwind distance. The alternative is to read the values from Turner’s Figures 3-2 and 3-3 and input them into the calculation for each individual value of downwind distance. 相似文献
78.
Laurel J. Staley Marta K. Richards George L. Huffman Robert A. Olexsey Barry Dellinger 《Journal of the Air & Waste Management Association (1995)》2013,63(3):321-331
Measurements conducted on full-scale hazardous waste incinerators have occasionally shown a relationship between carbon monoxide (CO) emissions and emissions of toxic organic compounds. In this study, four mixtures of chlorinated C1 and C2 hydrocarbons were diluted in commercial-grade heptane and burned in a water-cooled turbulent flame reactor (TFR) under two different excess air levels. No correlation between CO and organic emissions could be discerned. Reasons for this lack of observable correlations are discussed in terms of combustion and chemical reaction kinetic theory. 相似文献
79.
While the United States is the largest single market for air pollution control equipment, it constitutes only about one-third of the total world market. This overview explores the legislative, economic, and technological factors that affect those markets. 相似文献
80.