全文获取类型
收费全文 | 1063篇 |
免费 | 45篇 |
国内免费 | 350篇 |
专业分类
安全科学 | 61篇 |
废物处理 | 63篇 |
环保管理 | 88篇 |
综合类 | 538篇 |
基础理论 | 190篇 |
污染及防治 | 376篇 |
评价与监测 | 48篇 |
社会与环境 | 32篇 |
灾害及防治 | 62篇 |
出版年
2024年 | 1篇 |
2023年 | 17篇 |
2022年 | 59篇 |
2021年 | 44篇 |
2020年 | 27篇 |
2019年 | 30篇 |
2018年 | 41篇 |
2017年 | 42篇 |
2016年 | 47篇 |
2015年 | 67篇 |
2014年 | 80篇 |
2013年 | 102篇 |
2012年 | 96篇 |
2011年 | 93篇 |
2010年 | 77篇 |
2009年 | 65篇 |
2008年 | 79篇 |
2007年 | 69篇 |
2006年 | 74篇 |
2005年 | 47篇 |
2004年 | 31篇 |
2003年 | 32篇 |
2002年 | 32篇 |
2001年 | 29篇 |
2000年 | 21篇 |
1999年 | 20篇 |
1998年 | 22篇 |
1997年 | 22篇 |
1996年 | 16篇 |
1995年 | 14篇 |
1994年 | 11篇 |
1993年 | 15篇 |
1992年 | 9篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 4篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1986年 | 2篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1971年 | 1篇 |
1969年 | 1篇 |
1962年 | 1篇 |
排序方式: 共有1458条查询结果,搜索用时 0 毫秒
221.
222.
中国地区氧化亚氮排放量及其变化的估算 总被引:14,自引:2,他引:12
对我国大气中氧化亚氮的排放源及其大小进行了分析和计算,中国地区氧化亚氮的年排放置为950G_9N_2O-N,约占全球总排放量的6%.天然源和人为源各占我国氧化亚氮排放量的71%和29%.在天然源中以海洋排放为主,人为源中则以煤炭燃烧释放的贡献最大.计算显示今后几年内氧化亚氮排放的年增加量是6G_9N_2O-N. 相似文献
223.
Drying experiments of dewatered sewage sludge (DSS) were conducted on a agitated paddle dryer, and the effects of additive agents, i.e., CaO, pulverized coal (PC), heavy oil (HO), and dried sludge ("DS" through back mixing) on the agitated drying characteristics of DSS were investigated. The results indicated that CaO can significantly increase the drying rate of DSS. The drying rate at CaO/DSS (mass ratio) = 1/100 was 135% higher than that of CaO/DSS = 0. Pulverized coal has no obvious effect on drying rate, but the increase of PC/DSS can promote breaking up of sludge lump. Heavy oil was found to be slightly effective in improving the drying rate of DSS in the examined experimental range of HO/DSS = 0-1/20. It is also found thatHOcan reduce the torque of the dryer shaft, due to its lubrication effect. Back mixing of DS was found to be effective in alleviating the unfavorable effect of the lumpy phase by improving the mixing effect of the paddle dryer. There was a marked increase of drying rate with an increase of the DS/DSS in the experimental range of DS/DSS = 0-1/3. 相似文献
224.
Kinetics of aniline oxidation with chlorine dioxide 总被引:4,自引:0,他引:4
FAN Zhi-yun HUANG Jun-li WANG Peng SU Li-qiang ZHENG Yong-jie LI Ying-jie 《环境科学学报(英文版)》2004,16(2):238-241
For the first time, kinetics of aniline oxidation with chlorine dioxide(ClO2) were investigated systematically by detecting concentration of aniline with HPLC at regular intervals. Results showed that the reaction was first-order both in ClO2 and in aniline, and the oxidation reaction could be described as second-order reaction. Stoichiometric factor η was experimentally determined to be 2.44. The second-order-reaction rate constant k was 0.11L/(mol.s)under condition of pH 6.86 and water temperature(Tw) 287K. Reaction activation energy was 72.31 kJ/mol, indicating that the reaction could take place under usual water treatment conditions. The reaction rate constants in acidic and alkali media were greater than that in neutral medium. Chlorite ion could slightly increase reaction rate in acidic medium. p-aminophenol and azobenzene were detected by GC-MS as intermediates. 相似文献
225.
Nachiappan Subramanian Angappa Gunasekaran Muhammad D. Abdulrahman Chang Liu Danwei Su 《国际发展与全球生态学杂志》2014,21(3):223-234
In recent years, the implementation of reverse logistics (RL) in automobile manufacturing has drawn extensive interest from the Chinese government that has launched relevant take-back and environmental regulations and pilot projects. This study focuses on RL implementation issues in Chinese auto-parts manufacturing sector. Based on comprehensive literature review and multiple case studies in the Chinese auto-parts firms, this paper proposes a conceptual RL framework and highlights the major implementation issues. The purpose of this paper is to draw an overall picture of RL in the Chinese context, highlighting implementation issues in the auto-parts sector. Our study suggests that Chinese RL implementation requires close government monitoring mechanism and incentives, top management commitment within firms, technology and human capabilities support. 相似文献
226.
Wang Xin Li Yinqiang Lin Mingqing Su Zhinan Liu Xiong Yu Kefu 《Environmental science and pollution research international》2023,30(1):274-286
Environmental Science and Pollution Research - High-latitude coral communities have attracted much attention due to their potential as refuges during global climate change. However, this function... 相似文献
227.
Xiang Huiming Cheng Le Liu Weiye Wang Saier Zhang Yi Su Lianghu Tan Chaoqun Li Yuping 《Environmental science and pollution research international》2023,30(2):3056-3069
Environmental Science and Pollution Research - The properties of leachate from refuse transfer stations (RTSs) in rural China were indefinite. In this study, a total of 14 leachate samples from... 相似文献
228.
在土体?结构体系动力响应研究中,输入地震动特性是必须考虑的关键因素。分别考虑地震动的频谱特性差异和速度脉冲特征,选取了两条不同类型的地震动加速度记录及一条人工合成地震动时程作为输入地震动,设计并开展了隧道与地上建筑结构体系模型的振动台试验,基于试验数据分析了地震动频谱与速度脉冲特性对隧道与地上建筑结构动力响应的影响。结果表明:场地?隧道?地上结构体系地震响应中,隧道与地上结构的相互作用效应显著,地上结构的存在对地下隧道地震响应的较高频响成分有更显著的影响;相互作用效应显著地受到场地输入地震动频谱特性的影响;输入地震动的速度脉冲特性对隧道响应的影响主要表现在较高频范围,而对地上结构响应的影响不只表现在较高频范围,对周期 1.0~2.0 的频率范围的响应也具有明显增大作用。 相似文献
229.
Tong-ming Su Zu-zeng Qin Hong-bing Ji Yue-xiu Jiang Guan Huang 《Environmental Chemistry Letters》2016,14(1):99-112
Fossil fuels are currently the major energy source and are rapidly consumed to supply the increasing energy demands of mankind. CO2, a product of fossil fuel combustion, leads to climate change and will have a serious impact on our environment. There is an increasing need to mitigate CO2 emissions using carbon–neutral energy sources. Therefore, research activities are devoted to CO2 capture, storage and utilization. For instance, photocatalytic reduction of CO2 into hydrocarbon fuels is a promising avenue to recycle carbon dioxide. Here we review the present status of the emission and utilization of CO2. Then we review the photocatalytic conversion of CO2 by TiO2, modified TiO2 and non-titanium metal oxides. Finally, the challenges and prospects for further development of CO2 photocatalytic reduction are presented. 相似文献
230.
氨基脲的毒性效应研究进展 总被引:1,自引:0,他引:1
环境及食品中的氨基脲主要来源于硝基呋喃类药物及偶氮二甲酰胺的分解;同时,次氯酸盐与氨基酸的作用也能产生氨基脲. 氨基脲曾在食品动物、玻璃包装食品等多种食品中被检出,近期在我国东营潮河入海口邻近海域也有检出. 早期的研究表明,氨基脲具有致诱变性和潜在的致癌性;而近期的研究表明,氨基脲不仅能够在组织形态学水平上导致多种组织器官的形态改变,而且还可对神经系统、内分泌系统的功能产生影响. 50~150mg/L氨基脲可导致大鼠胎儿肺和肝脏器官内核酸水平显著降低,增加幼年小鼠肺肿瘤发生率;此外,能够显著增加鼠骨髓嗜多染红细胞的微核率,表现出弱遗传毒性. 氨基脲是GABA合成酶GAD(谷氨酸脱羧酶)的抑制剂,并且对NMDAR(N-甲基-D-天氡氨酸受体)具有拮抗作用,从而产生神经毒性. 氨基脲可致大鼠多个靶组织器官形态结构的改变且具有一定的性别差异,其中,对胸腺及肾上腺的组织学改变仅在雌性中表现出来,而对甲状腺组织结构的改变仅在雄性中表现明显,对生殖器官的毒性表现为其能够改变雌性卵巢和雄性睾丸显微结构. 雌性大鼠口服40、75、140mg/kg氨基脲28d能够降低其血浆内E2(雌二醇)水平,并且呈剂量-效应关系,表现出抗雌激素效应. 未来应继续补充氨基脲的毒性数据,以揭示其毒性作用机制;同时,应从其衍生物降解规律、环境风险评价等角度进行深入研究. 相似文献