全文获取类型
收费全文 | 7675篇 |
免费 | 676篇 |
国内免费 | 2349篇 |
专业分类
安全科学 | 701篇 |
废物处理 | 353篇 |
环保管理 | 639篇 |
综合类 | 4593篇 |
基础理论 | 1278篇 |
环境理论 | 2篇 |
污染及防治 | 1896篇 |
评价与监测 | 482篇 |
社会与环境 | 387篇 |
灾害及防治 | 369篇 |
出版年
2024年 | 28篇 |
2023年 | 155篇 |
2022年 | 400篇 |
2021年 | 349篇 |
2020年 | 344篇 |
2019年 | 275篇 |
2018年 | 323篇 |
2017年 | 337篇 |
2016年 | 349篇 |
2015年 | 378篇 |
2014年 | 537篇 |
2013年 | 728篇 |
2012年 | 709篇 |
2011年 | 697篇 |
2010年 | 587篇 |
2009年 | 563篇 |
2008年 | 547篇 |
2007年 | 522篇 |
2006年 | 493篇 |
2005年 | 365篇 |
2004年 | 235篇 |
2003年 | 257篇 |
2002年 | 221篇 |
2001年 | 184篇 |
2000年 | 207篇 |
1999年 | 151篇 |
1998年 | 134篇 |
1997年 | 121篇 |
1996年 | 118篇 |
1995年 | 89篇 |
1994年 | 67篇 |
1993年 | 44篇 |
1992年 | 60篇 |
1991年 | 26篇 |
1990年 | 27篇 |
1989年 | 17篇 |
1988年 | 10篇 |
1987年 | 7篇 |
1986年 | 5篇 |
1985年 | 9篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1981年 | 6篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1973年 | 4篇 |
1972年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 781 毫秒
721.
SO2 remains a common air pollutant, almost half of the world’s population uses coal and biomass fuels for domestic energy. Limited evidence suggests that exposure to SO2 may be associated with neurotoxicity and increased risk of hospitalization and mortality of many brain disorders. However, our understanding of the mechanisms by which SO2 causes harmful insults on neurons remains elusive. To explore the molecular mechanism of SO2-induced neurotoxic effects in hippocampal neurons, we evaluated the synaptic plasticity in rat hippocampus after exposure to SO2 at various concentrations (3.5 and 7 mg m−3, 6 h d−1, for 90 d) in vivo, and in primary cultured hippocampal neurons (DIV7 and DIV14) after the treatment of SO2 derivatives in vitro. The results showed that SYP, PSD-95, NR-2B, p-ERK1/2 and p-CREB were consistently inhibited by SO2/SO2 derivatives in more mature hippocampal neurons in vivo and in vitro, while the effects were opposite in young hippocampal neurons. Our results indicated that in young neurons, SO2 exposure produced neuronal insult is similar to ischemic injury; while in more mature neurons, SO2 exposure induced synaptic dysfunctions might participate in cognitive impairment. The results implied that SO2 inhalation could cause different neuronal injury during brain development, and suggested that the molecular mechanisms might be involved in the changes of synaptic plasticity. 相似文献
722.
Haichao Hu Junting Zhang Hong Wang Ruochen Li Fengshan Pan Jian Wu Ying Feng Yeqing Ying Qingpo Liu 《Environmental science and pollution research international》2013,20(12):8579-8589
Chronic exposure to arsenic (As) in rice has raised many health and environmental problems. As reported, great variation exists among different rice genotypes in As uptake, translocation, and accumulation. Under hydroponic culture, we find that the Chinese wild rice (Oryza rufipogon; acc. 104624) takes up the most arsenic among tested genotypes. Of the cultivated rice, the indica cv. 93-11 has the lowest arsenic translocation factor value but accumulates the maximum concentration of arsenic followed by Nipponbare, Minghui 86, and Zhonghua 11. Higher level of arsenite concentration (50 μM) can induce extensive photosynthesis and root growth inhibition, and cause severe oxidative stress. Interestingly, external silicate (Si) supplementation has significantly increased the net photosynthetic rate, and promoted root elongation, as well as strongly ameliorated the oxidative stress by increasing the activities of antioxidant enzymes superoxide dismutase, ascorbate peroxidase, and peroxidase in roots and/or leaves of 93-11 seedlings. Notably, 1.873 mM concentration of Si considerably decreases the total As uptake and As content in roots, but significantly increases the As translocation from roots to shoots. In contrast, Si supplementation with 1.0 mM concentration significantly increases the total As uptake and As concentrations in roots and shoots of 93-11 seedlings after 50 μM arsenite treatment for 6 days. 相似文献
723.
Facile, effective, and environment-friendly degradation of sulfamonomethoxine in aqueous solution with the aid of a UV/Oxone oxidative process 总被引:1,自引:0,他引:1
Yunqing Pi Jinglan Feng Jingyu Sun Jianhui Sun 《Environmental science and pollution research international》2013,20(12):8621-8628
The degradation of sulfamonomethoxine (SMM) in the aqueous environment by the combination of UV illumination and Oxone has been studied. Experimental results indicated that the UV illumination can effectively activate Oxone to produce sulfate-free radicals (SO4 ??). When 10 mmol L?1 Oxone was added, 96.78 % removal of SMM (5 mg L?1) was achieved within 90 min. Mineralization of SMM was investigated by measuring the total organic carbon, which decreased by 89.01 % after 90 min reaction. Six intermediate compounds generated during the SMM degradation were identified with the aid of liquid chromatography and mass spectroscopy, combined with proton nuclear magnetic resonance spectroscopy. A general reaction pathway for the degradation of SMM was proposed, where the presence of SO4 ?? remained crucial during the degradation process. 相似文献
724.
725.
基于AERMOD模式的固定源对不同楼层大气污染预测研究 总被引:1,自引:0,他引:1
环境影响评价中,大气污染预测通常考虑地面的浓度影响,对高层住宅楼不同楼层影响的考虑较少.通过案例设计,模拟4种不同的污染排放情景,采用预测推荐模式AERMOD分别计算各情景下5个代表高度共20种组合情况的预测受体结果,并基于三维可视仪软件VOXLER直观显示各情景污染物浓度的空间连续分布情况,对小时最大浓度的分布规律利用分析工具CANOCO进行了分析.结果表明:(1)污染源高为15~80 m时,不同楼层间小时浓度分布差异性较大;污染源高为120~240 m时,楼层间差异性较小.(2)污染源高为15m时,小时最大浓度以50 m为分界线随楼层高度的增加先增后降;污染源高为80~240 m时,小时最大浓度随楼层高度的增加而增加. 相似文献
726.
以表面活性剂TritonX-100(TX-100)为洗脱剂,某有机氯农药(organochlorinepesticides,OCPs)污染场地土壤为对象,七氯、氯丹和灭蚁灵为目标污染物,研究微米Cu/Fe双金属对污染土壤洗脱液中OCPs的降解效果。考察了洗脱液中OCPs初始浓度、洗脱液pH值、微米零价铁加入量和cu负载量对Cu/Fe去除OCPs效果的影响。结果表明,微米Cu/Fe可以有效的去除土壤洗脱液中目标污染物。当微米零价铁加入量为1.0g(25g/L),cu负载量为1.0%,洗脱液pH值为6.89时,Cu/Fe对2号土壤洗脱液中七氯、γ-氯丹、α-氯丹和灭蚁灵的去除效果最好,去除率分别为100.0%、99.3%、80.8%和71.1%。洗脱液中OCPs初始浓度越低,微米零价铁加入量越大,Cu/Fe对OCPs去除率越高;偏酸性条件有利于Cu/Fe对γ-氯丹和灭蚁灵的去除,而α-氯丹在中性条件下去除效果最好;1号土壤和2号土壤洗脱液的最佳铜负载量分别为2.O%和1.0%。 相似文献
727.
混凝辅助电化学法处理橙黄G染料废水 总被引:1,自引:0,他引:1
以石墨板为阳极,研究了电化学氧化法对橙黄G染料废水的降解效果。比较了在NaCl、Na2 SO4以及NaCl与FeSO4·7H2O组合的支持电解质体系中的处理效果,同时考察了电压、初始pH、电解质浓度、电极间距和电解时间等因素对废水中橙黄G脱色率及COD去除率的影响。研究结果表明,橙黄G的脱色主要是活性氯的氧化作用,橙黄G分子的矿化可能主要是电解过程中产生的·OH的作用,FeSO4·7H2O的加入增加了混凝作用,使得处理效果进一步提高。最佳脱色条件下橙黄G脱色率和COD的去除率分别为97.6%和56.3%,B/C(BOD/COD)由0.09提高至0.41,可生化性有较大改善,并且随着降解时间的增加,COD去除率逐渐升高。此结果表明,橙黄G废水COD的去除相对于脱色存在滞后性。 相似文献
728.
四环素高效降解酵母菌Trichosporon mycotoxinivorans XPY-10降解特性 总被引:4,自引:0,他引:4
Trichosporon mycotoxinivorans XPY-10是一株分离自抗生素制药厂的高效四环素降解酵母菌。为了建立该菌株降解四环素的适宜条件,分别研究了碳源、有机氮源、金属离子等营养物质及初始底物浓度、接种量、pH、温度、装液量、摇床转速等理化因素对菌体生长及四环素降解效率的影响。结果表明,菌株XPY-10生长的最适碳源和氮源分别为蔗糖和蛋白胨。在含有0.05%FeSO4的培养基中,菌株XPY—10降解四环素的适宜条件为:接种量2%,pH8,温度3422,装液量100mL(250mL三角瓶),摇床转速180r/min。在此条件下,菌株XPY—10在7d内对初始浓度为600mg/L的四环素降解率为83.63%。本菌株对养殖废水及制药废水中四环素的污染治理有一定的应用前景。 相似文献
729.
The fly ash treated by H2SO4 was used as a low-cost adsorbent for the removal of a typical dye, methylene blue, from aqueous solution. An increase in the specific surface area and dye-adsorption capacity was observed after the acid treatment. The adsorption isotherm and kinetics of the treated fly ash were studied. The experimental results were fitted using Langmuir and Freundlich isotherms. It shows that the Freundlich isotherm is better in describing the adsorption process. Two kinetic models, pseudo-first order and pseudo-second order, were employed to analyze the kinetic data. It was found that the pseudo-second-order model is the better choice to describe the adsorption behavior. The thermodynamic study reveals that the enthalpy (ΔH0) value is positive (5.63 kJ/mol), suggesting an endothermic nature of the adsorption. 相似文献
730.