全文获取类型
收费全文 | 1706篇 |
免费 | 155篇 |
国内免费 | 785篇 |
专业分类
安全科学 | 168篇 |
废物处理 | 98篇 |
环保管理 | 162篇 |
综合类 | 1182篇 |
基础理论 | 239篇 |
污染及防治 | 591篇 |
评价与监测 | 80篇 |
社会与环境 | 65篇 |
灾害及防治 | 61篇 |
出版年
2024年 | 11篇 |
2023年 | 67篇 |
2022年 | 125篇 |
2021年 | 119篇 |
2020年 | 108篇 |
2019年 | 79篇 |
2018年 | 83篇 |
2017年 | 111篇 |
2016年 | 104篇 |
2015年 | 134篇 |
2014年 | 143篇 |
2013年 | 201篇 |
2012年 | 143篇 |
2011年 | 160篇 |
2010年 | 126篇 |
2009年 | 100篇 |
2008年 | 106篇 |
2007年 | 91篇 |
2006年 | 90篇 |
2005年 | 63篇 |
2004年 | 43篇 |
2003年 | 40篇 |
2002年 | 45篇 |
2001年 | 42篇 |
2000年 | 48篇 |
1999年 | 48篇 |
1998年 | 39篇 |
1997年 | 30篇 |
1996年 | 34篇 |
1995年 | 31篇 |
1994年 | 18篇 |
1993年 | 13篇 |
1992年 | 17篇 |
1991年 | 5篇 |
1990年 | 7篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1974年 | 1篇 |
1973年 | 5篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有2646条查询结果,搜索用时 0 毫秒
701.
KNO3对毛萼田菁(Sesbaniarostrata)茎瘤和根瘤固氮的抑制作用与瘤中积累,碳水化合物减少(特别是蔗糖)以及豆血红蛋白(lghemoglobin,Lb)浓度减少和功能受阻相关.经KNO3处理的植株的茎瘤类菌体的呼吸作用和固氮活性明显下降.从KNO3处理的植株茎瘤中提取的类菌体悬液加上未经KNO3处理的正常Lb可提高固氮活性和耐pO2;加5mmol/LKNO2于正常的茎瘤类菌体悬液和Lb反应体系,引起固氮活性和耐pO2都降低,证明是Lb功能受阻的重要因素.施KNO3可能还导致茎瘤O2扩散的阻力增加. 相似文献
702.
分析了固定式监测有毒气体报警系统在某些条件下使用的弊端,通过研制模拟显示屏监控主机,使这类系统适合在各种工矿条件下使用。 相似文献
703.
综述了对事故致因理论的研究现状 ;提出了系统事故过程的确定性混沌分析方法 ;介绍了混沌分析方法的计算步骤 ;并以矿井火灾过程进行了实例分析。结果表明 :这种方法可对事故过程的系统状态进行连续分析。 相似文献
704.
Baoping Cai Yonghong Liu Yunwei Zhang Qian Fan Zengkai Liu Xiaojie Tian 《Journal of Loss Prevention in the Process Industries》2013,26(4):639-649
An application of dynamic Bayesian networks for quantitative risk assessment of human factors on offshore blowouts is presented. Human error is described using human factor barrier failure (HFBF), which consists of three categories of factors, including individual factor barrier failure (IFBF), organizational factor barrier failure (OFBF) and group factor barrier failure (GFBF). The structure of human factors is illustrated using pseudo-fault tree, which is defined by incorporating the intermediate options into fault tree in order to eliminate the binary restriction. A methodology of translating pseudo-fault tree into Bayesian networks and dynamic Bayesian networks taking repair into consideration is proposed and the propagation is performed. The results show that the human factor barrier failure probability only increases within the first two weeks and rapidly reaches a stable level when the repair is considered, whereas it increases continuously when the repair action is not considered. The results of mutual information show that the important degree sequences for the three categories of human factors on HFBF are: GFBF, OFBF and IFBF. In addition, each individual human factor contributes different to the HFBF, those which contribute much should given more attention in order to improve the human reliability and prevent the potential accident occurring. 相似文献
705.
气体爆炸是工业生产和生活领域中爆炸灾害的主要形式之一,研究障碍物对管道内可燃气体爆炸的影响规律具有十分重要的现实意义。运用计算流体动力学软件AutoReaGas,定量地研究了障碍物阻塞率、个数等因素对管道中预混乙炔/空气混和物爆炸压力场的影响规律。计算结果表明,障碍物的个数和阻塞比对管道内乙炔气体爆炸峰值超压均有显著影响。本文的研究结果对于预防和控制气体爆炸灾害有一定的借鉴作用。 相似文献
706.
707.
以厌氧颗粒污泥为接种污泥,采用味精生产废水进行培养,在SBR中以逐渐降低污泥沉淀时间的方法成功培养出好氧颗粒污泥。实验结果表明:污泥接种65 d后,出现细小的好氧颗粒污泥,呈黄褐色,95 d后颗粒污泥趋于成熟,粒径达0.6 mm左右,且周围存在大量原生动物;运行95 d后MLSS提高至8.00 g/L,SVI降至30.00 mL/g左右;成熟后的好氧颗粒污泥对味精生产废水中的COD和NH3-N具有良好的去除效果,出水COD和ρ(NH3-N)分别为80 mg/L和2 mg/L左右。 相似文献
708.
Fan Li Yue Zhan Dandan Liu Dongbo Liu Hongmei Xia Shan Chen 《Journal of Polymers and the Environment》2013,21(4):1143-1149
The fermentation conditions for poly(l-lactide) (PLA)-degrading enzyme production by Amycolatopsis orientalis ssp. orientalis were statistically optimized by response surface methodology. The optimal value of the most important factors was 0.39 % PLA and 0.34 % gelatin for 2.81 days of cultivation. Under these conditions, the model predicted a PLA-degrading activity of 155.30 U/l. The verification showed the production amount of 154.2 U/l. The crude enzyme from A. orientalis ssp. orientalis showed potent PLA-degrading ability, which is efficient for the biological recycling of PLA. Up to 4,000 mg/l of PLA granule was completely degraded within 5 days at 45 °C by the crude enzyme. l-lactic acid (600 mg/l) was obtained as a degradation product of PLA after only 2 h of incubation. The results indicated that the crude PLA-degrading enzyme from A. orientalis ssp. orientalis has the potential to degrade PLA to lactic acid for the recycling of PLA industry and waste disposal. 相似文献
709.
Zhenzi Jing Xinwei Fan Lei Zhou Junjie Fan Yi Zhang Xiaohui Pan Emile Hideki Ishida 《Waste management (New York, N.Y.)》2013,33(5):1182-1189
Municipal solid waste incineration (MSWI) bottom ash could be solidified with and without slaked lime (calcium hydroxide) addition by a hydrothermal method under steam pressure of 1.56 MPa at 200 °C for up to 72 h. Experimental results showed that CSH gel or tobermorite exerted a main influence on strength development, and without any additives CSH gel was easy to form, while slaked lime addition favored to form tobermorite. Tobermorite seemed to exert a larger effect on the strength development than CSH gel. Leaching results showed that the concentrations of heavy metals dissolved from the solidified specimens were effectively reduced after hydrothermal processing. The immobilization was mainly due to the tobermorite or CSH gel formation, and Pb2+ and Zn2+ seemed to be fixed more readily than Cr6+, which might be the reason that the structural Ca2+ within tobermorite or CSH gel was exchanged by Pb2+ and Zn2+ more easily than Cr6+. In addition, there existed a close relationship between leaching concentration and strength enhancement, and a higher strength seemed to exert a larger effect on immobilization of heavy metals. 相似文献
710.