全文获取类型
收费全文 | 1167篇 |
免费 | 145篇 |
国内免费 | 424篇 |
专业分类
安全科学 | 110篇 |
废物处理 | 45篇 |
环保管理 | 90篇 |
综合类 | 849篇 |
基础理论 | 209篇 |
污染及防治 | 277篇 |
评价与监测 | 59篇 |
社会与环境 | 44篇 |
灾害及防治 | 53篇 |
出版年
2024年 | 6篇 |
2023年 | 36篇 |
2022年 | 100篇 |
2021年 | 89篇 |
2020年 | 96篇 |
2019年 | 69篇 |
2018年 | 68篇 |
2017年 | 76篇 |
2016年 | 70篇 |
2015年 | 63篇 |
2014年 | 96篇 |
2013年 | 91篇 |
2012年 | 102篇 |
2011年 | 81篇 |
2010年 | 96篇 |
2009年 | 87篇 |
2008年 | 80篇 |
2007年 | 82篇 |
2006年 | 54篇 |
2005年 | 35篇 |
2004年 | 22篇 |
2003年 | 24篇 |
2002年 | 24篇 |
2001年 | 40篇 |
2000年 | 36篇 |
1999年 | 28篇 |
1998年 | 16篇 |
1997年 | 12篇 |
1996年 | 12篇 |
1995年 | 9篇 |
1994年 | 16篇 |
1993年 | 10篇 |
1992年 | 4篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 3篇 |
排序方式: 共有1736条查询结果,搜索用时 296 毫秒
801.
802.
Jinsheng Chen Ping Li Yongguang Yin Kaiyun Liu Qingru Wu Shuxiao Wang Xing Chang Yi Tang Long Wang Tonghao Liu Lei Zhang Yu Zhao Yong Cai Xinbin Feng Huan Zhong 《环境科学学报(英文版)》2022,119(9):106-118
The gaseous or particulate forms of divalent mercury (HgII) significantly impact the spatial distribution of atmospheric mercury concentration and deposition flux (FLX). In the new nested-grid GEOS-Chem model, we try to modify the HgII gas-particle partitioning relationship with synchronous and hourly observations at four sites in China. Observations of gaseous oxidized Hg (GOM), particulate-bound Hg (PBM), and PM2.5 were used to derive an empirical gas-particle partitioning coefficient as a function of temperature (T) and organic aerosol (OA) concentrations under different relative humidity (RH). Results showed that with increasing RH, the dominant process of HgII gas-particle partitioning changed from physical adsorption to chemical desorption. And the dominant factor of HgII gas-particle partitioning changed from T to OA concentrations. We thus improved the simulated OA concentration field by introducing intermediate-volatility and semi-volatile organic compounds (I/SVOCs) emission inventory into the model framework and refining the volatile distributions of I/SVOCs according to new filed tests in the recent literatures. Finally, normalized mean biases (NMBs) of monthly gaseous element mercury (GEM), GOM, PBM, WFLX were reduced from −33%–29%, 95%–300%, 64%–261%, 117%–122% to −13%–0%, −20%–80%, −31%–50%, −17%–23%. The improved model explains 69%–98% of the observed atmospheric Hg decrease during 2013–2020 and can serve as a useful tool to evaluate the effectiveness of the Minamata Convention on Mercury. 相似文献
803.
Linke Wu Jiguang Deng Yuxi Liu Lin Jing Xiaohui Yu Xing Zhang Ruyi Gao Wenbo Pei Xiuqing Hao Ali Rastegarpanah 《环境科学学报(英文版)》2022,34(6):209-219
Catalytic combustion is thought as an efficient and economic pathway to remove volatile organic compounds, and its critical issue is the development of high-performance catalytic materials. In this work, we used the in situ synthesis method to prepare the silicalite-1 (S-1)-supported Pd nanoparticles (NPs). It is found that the as-prepared catalysts displayed a hexagonal prism morphology and a surface area of 390−440 m2/g. The sample (0.28Pd/S-1-H) derived after reduction at 500°C in 10 vol% H2 showed the best catalytic activity for toluene combustion (T50% = 180°C and T90% = 189°C at a space velocity of 40,000 mL/(g·hr), turnover frequency (TOFPd) at 160°C = 3.46 × 10−3 sec−1, and specific reaction rate at 160°C = 63.8 µmol/(gPd·sec)), with the apparent activation energy (41 kJ/mol) obtained over the best-performing 0.28Pd/S-1-H sample being much lower than those (51−70 kJ/mol) obtained over the other samples (0.28Pd/S-1-A derived from calcination at 500°C in air, 0.26Pd/S-1-im derived from the impregnation route, and 0.27Pd/ZSM-5-H prepared after reduction at 500°C in 10 vol% H2). Furthermore, the 0.28Pd/S-1-H sample possessed good thermal stability and its partial deactivation due to CO2 or H2O introduction was reversible, but SO2 addition resulted in an irreversible deactivation. The possible pathways of toluene oxidation over 0.28Pd/S-1-H was toluene → p-methylbenzoquinone → maleic anhydride, benzoic acid, benzaldehyde → carbon dioxide and water. We conclude that the good dispersion of Pd NPs, high adsorption oxygen species concentration, large toluene adsorption capacity, strong acidity, and more Pd0 species were responsible for the good catalytic performance of 0.28Pd/S-1-H. 相似文献
804.
还原稳定化修复技术是当前重金属污染修复领域的主要技术,其中,重金属去除率和环境扰动是评价修复效果的重要指标.以不同pH重铬酸钾溶液模拟Cr(Ⅵ)污染水体,分别研究了多硫化钙、硫酸亚铁和二者联用对水体重金属Cr(Ⅵ)的还原稳定性,同时考察了环境因素对药剂联用的影响并探究各药剂对Cr(Ⅵ)的去除机理.结果表明:当多硫化钙与硫酸亚铁投加比例为1:2时,药剂联用对Cr(Ⅵ)和总Cr的去除效果均优于单独施加药剂时的去除效果且还原产物较稳定,对体系扰动作用相对较小;低pH和较高温度有利于联用药剂对Cr(Ⅵ)的去除,HCO3-、Cl-、Mn2+的加入有利于去除Cr(Ⅵ),Fe3+对 Cr(Ⅵ)去除表现为低浓度抑制、高浓度促进;经反应产物成分分析,多硫化钙与硫酸亚铁反应生成了具有催化效果的FeS,提高了修复效果.以上研究结果可为后期Cr(Ⅵ)污染水体的控制和修复提供参考. 相似文献
805.
Chen Wei Wang Qian Li Qiao Wang Yanan Zheng Weiwei 《Environmental science and pollution research international》2023,30(9):22668-22685
Environmental Science and Pollution Research - With the improvement of industrialization, numerous rural laborers migrate to urban areas in search of off‐farm jobs. Farmers change... 相似文献
806.
Xing Yongjie Qin Zifang Feng Mingyue Li Aomei Zhang Liu Wang Yang Dong Xuehui Zhang Yuxin Tan Shuqian Shi Wangpeng 《Environmental science and pollution research international》2019,26(6):5814-5819
Environmental Science and Pollution Research - From 2014 to 2016, individuals of the principal non-target arthropod (NTA) species in a field of Bt maize expressing the Cry1Ac protein (Bt38) were... 相似文献
807.
市政检查井的井盖和井下线缆设备被盗易造成人员车辆安全隐患,造成通讯、电力、供水供气中断,使企业和居民蒙受巨大损失.介绍了一种检查井综合防盗监测技术,该技术应用ZigBee无线传输技术进行并盖状态监测传送,利用工频非接触供电和直流电机驱动井盖锁技术,通过特殊设备方能打开井盖,并可利用ZigBee无线传输技术将井盖状态信号发送至监控中心,以便实时监控区域内所有检查井的工况并能及时报警、处理. 相似文献
808.
Zhu Yuke Gao Honggui Hu Yanan Ding Qinan Tang Yiding 《Environmental science and pollution research international》2023,30(1):389-406
Environmental Science and Pollution Research - The target responsibility system of environmental protection is one of the vital channels to achieve a win–win situation for both economic... 相似文献
809.
Yanan Chen Jiquan Zhang Feng Zhang Fengxu Li Mo Zhou 《Environmental geochemistry and health》2018,40(2):791-802
Study on the occurrence, sources and potential human health risk of polycyclic aromatic hydrocarbons in farmland soils around reservoirs is of great significance for the people drinking water security. In the present study, representative farmland soil samples around main reservoirs of Jilin Province, China, were investigated for 16 PAHs. The total concentrations of 16 priority PAHs in 32 farmland soil samples ranged from 602.12 to 1271.87 ng/g, with an arithmetic average of 877.23 ng/g, and the sum of seven carcinogenic PAH concentrations ranged from 30.07 to 710.02 ng/g, with a mean value of 229.04 ng/g. The 3-ring and 4-ring PAHs were major exist and account for 45.78 and 32.03%, respectively. Non-cancer and cancer risk of pollutants were calculated, and the results indicate that the complex PAHs in farmland soils were not considered to pose significant health effects. The isomer ratios Fla/(Fla + Pyr) and BaA/(BaA + Chr) show that the PAHs in soils were generally derived from biomass and coal combustion. 相似文献
810.
Zhang Chao Wang Xing Jiang Shihao Zhou Mengying Li Fanglin Bi Xiangyang Xie Shuyun Liu Jinling 《Environmental science and pollution research international》2021,28(23):29231-29240
Environmental Science and Pollution Research - It is known that the tailings of gold mines have brought serious heavy metal pollution; however, the heavy metal pollution caused by gold tailings in... 相似文献