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671.
二溴醛干燥窑尾气污染主要是恶臭污染,本文着重叙述了净化的方法研究,结果表明,采用二级处理方式.能有效地除去固态污染物及恶臭污染. 相似文献
672.
城市生活垃圾填埋场气体的产生、控制及利用综述 总被引:14,自引:0,他引:14
对城市生活垃圾填埋场气体的产生、控制及利用进行了较为系统的综述分析,描述了填埋场气体的组成、性质及产生过程,分析了影响填埋场气体产生的因素,概括了填埋场气体控制手段和管理利用方式。 相似文献
673.
Christopher?T.?LlewellynEmail author Stefan?H.?Doerr Peter?Douglas Christopher?P.?Morley Kathryn?A.?Mainwaring 《Environmental Chemistry Letters》2004,2(1):41-44
The study of compounds associated with soil water repellency usually involves removing organic material from a sample by some extraction procedure. An evaluation of the kinetics and efficiency of Soxhlet extraction using an isopropanol-aqueous ammonia mixture is given here. Increasing extraction time caused an increase in the mass of material extracted and a decrease in soil water repellency. The same compound types were detected by gas chromatography-mass spectrometry in all extracts, but their proportions varied with extraction time. In particular, the removal of alkanes from the soil sample was less rapid than that of more polar compounds. 相似文献
674.
Sarah E. West R.C.Roberton C. Williams III 《Journal of Environmental Economics and Management》2004,47(3):535
Most studies suggest that environmental taxes are regressive, making them less attractive policy options. We consider the distributional effects of a gasoline tax increase using four incidence measures and under three scenarios for gas tax revenue use. To incorporate behavioral responses we use Consumer Expenditure Survey data to estimate a consumer demand system that includes gasoline, other goods, and leisure. Our estimates confirm that when revenues are not recycled, a gasoline tax is regressive. Use of incidence measures that ignore demand responses, however, will substantially overstate this regressivity. In contrast, the differences between the equivalent variation and easier-to-implement consumer surplus measures are relatively small. In addition, our results suggest that using the additional gas tax revenue to fund labor tax cuts makes the policy substantially less regressive while using the revenue to fund lump-sum transfers actually makes it progressive. 相似文献
675.
Mitani and Rodman (1979) showed that a simple measure of the defendability of the range area could differentiate fairly successfully between territorial and non-territorial species of primates. Their analysis has, however, been much criticised on the grounds that it considered only the day journey length and the diameter of the range area. We develop a number of more realistic indices of territory defendability that take into account both the length of the boundary to be defended and the detection distance as well as linear measures of range size. These indices (a) discriminate between territorial and non-territorial species more successfully than the Mitani-Rodman index and (b) allow the results to be extended to species which do not forage in cohesive groups. However, our results suggest that the Mitani-Rodman analysis was in many ways correct. 相似文献
676.
677.
根据IPCCGuidelines(1995)提供的方法,对1990年江浙沪地区小型燃烧中温空气体排放进行统计计算,2000年的预测情况与90年代的实际能源结构对比CO2减排的量为845.4万t,减排了总量的11%左右。 相似文献
678.
总烃和非甲烷烃的气相色谱法测定 总被引:2,自引:0,他引:2
采用双柱双氢焰离子化检测器测定空气中的总烃和非甲烷烃。用石英砂和GDX-502分别填充总烃柱及甲烷柱,以甲烷标准气定性和外标法峰高定量。方法精密度实验的变异系数为3.0%;准确度实验的回收率为98.0%;在上述两根柱上,甲烷的检测限分别为0.02mg/l和0.04mg/l。 相似文献
679.
城市生活垃圾填埋场产气规律研究 总被引:10,自引:0,他引:10
研究城市垃圾填埋气体成分及产气规律。方法通过深圳市玉龙坑垃圾填埋场现场抽气试验理论计算。结果场区内填埋气体含量分别为CH462.2%,O21.0%,CO234.7%,其余气体2.1%; 相似文献
680.