全文获取类型
收费全文 | 724篇 |
免费 | 47篇 |
国内免费 | 169篇 |
专业分类
安全科学 | 33篇 |
废物处理 | 59篇 |
环保管理 | 80篇 |
综合类 | 377篇 |
基础理论 | 80篇 |
污染及防治 | 212篇 |
评价与监测 | 42篇 |
社会与环境 | 26篇 |
灾害及防治 | 31篇 |
出版年
2024年 | 1篇 |
2023年 | 9篇 |
2022年 | 38篇 |
2021年 | 35篇 |
2020年 | 19篇 |
2019年 | 19篇 |
2018年 | 23篇 |
2017年 | 27篇 |
2016年 | 34篇 |
2015年 | 40篇 |
2014年 | 54篇 |
2013年 | 66篇 |
2012年 | 60篇 |
2011年 | 59篇 |
2010年 | 52篇 |
2009年 | 45篇 |
2008年 | 40篇 |
2007年 | 39篇 |
2006年 | 27篇 |
2005年 | 27篇 |
2004年 | 18篇 |
2003年 | 23篇 |
2002年 | 27篇 |
2001年 | 24篇 |
2000年 | 23篇 |
1999年 | 20篇 |
1998年 | 16篇 |
1997年 | 21篇 |
1996年 | 8篇 |
1995年 | 8篇 |
1994年 | 7篇 |
1993年 | 6篇 |
1992年 | 5篇 |
1991年 | 6篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1978年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有940条查询结果,搜索用时 15 毫秒
21.
Nur Hamizah Mohtor Mohd Hafiz Dzarfan Othman Ahmad Fauzi Ismail Mukhlis A. Rahman Juhana Jaafar Nur Awanis Hashim 《Environmental science and pollution research international》2017,24(19):15905-15917
Despite its extraordinary price, ceramic membrane can still be able to surpass polymeric membrane in the applications that require high temperature and pressure conditions, as well as harsh chemical environment. In order to alleviate the high cost of ceramic material that still becomes one of the major factors that contributes to the high production cost of ceramic membrane, various attempts have been made to use low cost ceramic materials as alternatives to well-known expensive ceramic materials such as alumina, silica, and zirconia in the fabrication of ceramic membrane. Thus, local Malaysian kaolin has been chosen as the ceramic material in this study for the preparation of kaolin hollow fibre membrane since it is inexpensive and naturally abundant in Malaysia. Due to the fact that the sintering process plays a prominent role in obtaining the desired morphology, properties, and performances of prepared ceramic membrane, the aim of this work was to study the effect of different sintering temperatures applied (ranging from 1200 to 1500 °C) in the preparation of kaolin hollow fibre membrane via dry/wet phase inversion-based spinning technique and sintering process. The morphology and properties of membrane were then characterised by SEM, AFM, FTIR, XRD, and three-point bending test, while the performances of membrane were investigated by conducting water permeation and Reactive Black 5 (RB5) dye rejection tests. From the experimental results obtained, the sintering temperature of 1400 °C could be selected as the optimum sintering temperature in preparing the kaolin hollow fibre membrane with the dense sponge-like structure of separation layer that resulted in the good mechanical strength of 70 MPa with the appreciable water permeation of 75 L/h m2 bar and RB5 rejection of 68%. 相似文献
22.
Xin Baoquan Yu Jianliang Dang Wenyi Wan Lu 《Environmental science and pollution research international》2021,28(34):46161-46175
Environmental Science and Pollution Research - The aim of this study was to analyze dispersion behavior characteristics and pollution hazard risk after a release of liquid chlorine. A full-scale... 相似文献
23.
针对高压储存的液化烃一旦发生泄漏,会迅速气化并吸热,使得球罐温度降低,严重时温度可能低于标准中允许的球罐材质最低适应温度的问题,建立球罐三维物理模型,基于CFD模拟的方法,采用雷诺时均的Navier-Stokes方程和k-ε湍流模型,分析球罐管线发生泄漏时球罐本体及周围环境的温度分布情况,探讨了不同泄漏孔径对球罐温度的影响。研究结果表明球罐发生泄漏时,球罐外部温度会明显降低,由于保温层的存在,球罐本体温度降幅不大。但在泄漏孔附近会形成较小的低温区,超过了16MnR材质的低温承受能力,存在较大的风险。 相似文献
24.
The adsorption behavior of 2-mercaptobenzothiazole onto organo-bentonite was investigated.Natural bentonite from Gaozhou in Guangdong Province,China was collected.Organo-bentonite was prepared by intercalation of cetyltrimethyl ammonium bromide into the natural bentonite.The physicochemical properties of the prepared organo-bentonite were characterized by X-ray diffraction,N2 adsorption-desorption isotherm and Fourier transform infrared spectroscopy.The results showed that montmorillonite is the main component of the natural bentonite.The basal spacing of the natural bentonite is 1.47 nm,which increased to 1.98 nm on intercalation with cetyltrimethyl ammonium bromide.Moreover,both the surface area and pore volume increased with intercalation.Clear CH2 stretching(3000-2800 cm-1) and scissoring(1480-1450 cm-1) modes of the intercalated surfactants were observed for organobentonite.Compared with the pseudo first-order kinetic model,the pseudo second-order kinetic model is more suitable to describe the adsorption kinetics of 2-mercaptobenzothiazole onto organo-bentonite.The adsorption capacity of 2-mercaptobenzothiazole onto organo-bentonite increased with increasing initial concentration of 2-mercaptobenzothiazole,but decreased with increasing adsorbent dosage.The adsorption isotherm of 2-mercaptobenzothiazole onto organo-bentonite fits well with the Langmuir model.The maximum adsorption capacity of organo-bentonite for 2-mercaptobenzothiazole was 33.61 mg/g,indicating that organo-bentonite is a promising adsorbent for 2-mercaptobenzothiazole. 相似文献
25.
万玉玲 《安全.健康和环境》2013,13(1):2-5
分析了近期国家陆续出台的各项政策对中国石化建设项目管理的影响,并提出了对策建议. 相似文献
26.
保护层分析应用规则研究 总被引:1,自引:0,他引:1
为了确保保护层分析(LOPA)结果的客观性和可靠性,对LOPA的应用规则进行了探讨.按照LOPA应用的基本程序,对场景筛选、确定初始事件、独立保护层评估、场景频率计算、风险决策及后续跟踪等的相关规则进行了阐述.企业在应用LOPA时,应严格按照这些规则进行. 相似文献
27.
28.
Kun Wan Wenfang Lin Shuai Zhu Shenghua Zhang Xin Yu 《Frontiers of Environmental Science & Engineering》2020,14(1):10
29.
新型单级A/O程序无回流复合膜生物反应器处理氨氮废水的试验 总被引:1,自引:1,他引:0
采用单级A/O程序复合膜生物反应器(HSMBR)处理高氨氮废水,研究在低DO浓度下系统对有机物、氨氮和总氮的去除效率。研究结果表明:在低DO浓度下,CODCr、氨氮的平均去除率分别为94.4%和92.8%。由于进水CODCr/TN值仅为2.01,则使得总氮平均去除率仅为69.4%,但是当系统亚硝化累积率从60.5%~67.1%提高到83.5%~86.4%时,系统总氮去除率提高了17.7%。另外,维持低DO浓度可以实现亚硝酸型同时硝化反硝化反应。 相似文献
30.
This study dealt with in situ removal of copper from sediments through an electrokinetic (EK) process driven by a galvanic cell. Iron (Fe) and carbon (C) were placed separately and connected with a conductive wire. Polluted sediments were put between them and water was filled above the sediments. The galvanic cell was thus formed due to the different electrode potentials of Fe and C. The cell could remove the pollutants in the sediments by electromigration and/or electroosmosis. Results showed that a weak voltage less than 1V was formed by the galvanic cell. The voltage decreased with the increase of time. A slight increase of sediment pH from the anode (Fe) to the cathode (C) was observed. The presence of supernatant water inhibited the variation of sediment pH because H(+) and OH(-) could diffuse into the water. The removal of copper was affected by the sediment pH and the distribution of electrolyte in sediment and supernatant water. Lower pH led to higher removal efficiency. More electrolyte in the sediment and/or less electrolyte in the supernatant water favored the removal of copper. The major removal mechanism was proposed on the basis of the desorption of copper from sediment to pore solution and the subsequent electromigration of copper from the anode to the cathode. The diffusion of copper from sediment to supernatant water was negligible. 相似文献