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941.
For study, the fluoride (F) content and distribution pattern in groundwater of eastern Yunnan and western Guizhou fluorosis
area in southwestern China, the F content of 93 water samples [groundwater (fissure water, cool spring, and hot springs),
rivers water] and 60 rock samples were measured. The result shows the F content of the fissure water and cold spring water
is 0.027–0.47 mg/L, and river water is 0.048–0.224 mg/L. The F content of hot spring water is 1.02–6.907 mg/L. The drinking
water supplied for local resident is mainly from fissure water, cool spring, and river water. And the F content in all of
them is much lower than the Chinese National Standard (1.0 mg/L), which is the safe intake of F in drinking water. The infected
people in eastern Yunnan and western Guizhou fluorosis area have very little F intake from the drinking water. The hot spring
water in fluorosis area of eastern Yunnan and western Guizhou, southwest China has high F content, which is not suitable for
drinking. 相似文献
942.
Guowei Zheng Yanxia jia Xu Zhao Fujuan Zhang Shihong Luo Shenghong Li Weiqi Li 《Chemoecology》2012,22(2):131-138
A phytochemical study of the invasive Eupatorium adenophorum indicated that the plant was rich in a phenolic compound o-coumaric acid (or 2-hydroxycoumaric acid). Biological investigations with the model plant Arabidopsis thaliana and crop plants showed that o-coumaric acid strongly inhibited seed germination, plant growth and root elongation, reduced the photosynthesis in old leaves,
and induced the root cell death and the expression of genes related to senescence, oxidative stress, and systemic acquired
resistance. The phytotoxic effects of o-coumaric acid exhibit selectivity between under- and above-ground parts of test plants and between E. adenophorum and other plants. These results indicate that o-coumaric acid is a potent toxin that might play an important role in the competition of E. adenophorum with its neighboring plants during its invasion and establishment. 相似文献
943.
采用Tessier连续提取法对乌鲁木齐七道湾污水厂夏季和冬季污泥中的Cu、Zn、Pb、Cd进行了含量和形态分析,研究了污泥中重金属的生物有效性。结果表明:该污水厂污泥中重金属含量Zn>Cu>Pb>Cd,4种重金属含量均低于污泥农用污染物控制标准限值。Cu、Zn、Pb主要以残渣态和有机结合态形式存在,Cd主要以残渣态、铁锰氧化态和碳酸盐结合态形式存在。Zn、Cu的生物不可利用态含量高,所占比例在60%以上,对污泥农用有利,Pb、Cd两种元素的生物有效态和潜在有效态之和所占比例在50%以上,有较强的生物可利用性,在污泥农用时存在一定潜在风险。 相似文献
944.
通过分析已实施的工程运行情况,总结了玻璃窑烟气采用湿法净化系统存在的一些问题:一是高温腐蚀非常严重,二是结垢堵塞严重,再就是水处理系统的冷热水分层问题。供类似工程的方案设计参考。 相似文献
945.
创新安全教育教学思路增强安全教育实效 总被引:2,自引:0,他引:2
在安全教育教学实践中,创新安全教育教学思路,采用互动式教育法、正反例证教育法、安全文化教育法、格言警句教育法等职工乐于接受的方式方法,对于增强安全教育效果有重要的作用。针对不同的教育对象,方法上要有所侧重。同时安全教师应选择新近、及时的安全教育内容,并不断提高自身素质。 相似文献
946.
近年来室内装修污染健康危害事件不断发生,成为居民投诉的热点,室内环境安全也已成为学术界和政府部门关心的焦点.本文以九江地区室内环境质量状况为例,指出了室内空气污染的来源,分析了各种室内主要污染物对人体健康的影响,对如何防治室内污染,达到居住环境安全的问题进行初步的探讨. 相似文献
947.
罗贻文 《安全.健康和环境》2005,5(9):18-19
为了克服氧化铁厦粉尘等杂物滞留在直缝焊管缝内,设计并制作了吸附处理装置。介绍了该装置的结构照成、装置特点厘工作流程等+实际应用表明,这套装置吸附分离效果良好。 相似文献
948.
模拟废水丁二酸的催化湿式氧化处理 总被引:19,自引:0,他引:19
对催化湿式氧化专用的TiO2载体及Ru-TiO2催化剂的抗压强度、比表面积、孔体积、平均粒径、晶体结构等重要物性参数进行了表征.在间歇式反应釜上研究了Ru-TiO2催化剂在处理模拟废水丁二酸(7.40g/L,COD=7000mg/L)中的催化活性、影响因素及金属溶出问题.研究表明:在Ru含量相同的情况下,载体的比表面积、孔体积越大,催化活性越高.经过表面处理的载体制备的催化剂活性显著提高(COD去除率增加约10%).反应受温度、pH值等因素的影响:在反应温度270℃,pH=11.00,起始压力2.3MPa,反应压力7.1MPa条件下,经30min反应,COD去除率为67.4%~95.4%.在间歇式反应釜中连续运行12次后,催化活性稳定,Ru流失甚微.在200L/d的小型工业化装置上一个月的运行,保持COD去除率大于99%,NH3-N去除率约100%. 相似文献
949.
Xiuhua LI Haibo ZHANG Yongming LUO Ying TENG 《Frontiers of Environmental Science & Engineering》2014,8(2):277-283
Polychlorinated biphenyls (PCBs) were removed by low-temperature plasma technique (dielectric barrier discharge) from heavily polluted soil and their intermediate products were analyzed. The removal rate ranged from 40.1 to 84.6% by different treatments, and they were also influenced significantly (P 〈 0.01) by soil particle-size, electric power, gas flow rate and reaction time. The optimal reaction conditions of PCB removal from the soil were obtained experimentally when soil particle-size, electrical power, flow rate and reaction time were 5-10mm, 21w, 120mL. rain and 90rain, respectively. However, decreasing electrical power, flow rate and reaction time to 18 w, 60 mL. min- and 60 min respectively were also acceptable in view of the cost of remediation. This technique was characterized by the additional advantage of thorough oxidation of PCBs in the soil, with no formation of intermediate products after reaction. The technique therefore shows some promise for application in the remediation of soils contaminated with persistent organic pollutants in brown field sites in urban areas. 相似文献
950.
Jun QIAO Chengdong ZHANG Shuiming LUO Wei CHEN 《Frontiers of Environmental Science & Engineering》2014,8(2):293-304
This study evaluated the effectiveness of different amendments--including a commercial NPK fertilizer, a humic substance (HS), an organic industrial waste (NovoGro), and a yeast-bacteria consortium--in the remediation of highly contaminated (up to 6% of total petroleum hydrocarbons) oilfield soils. The concentrations of hydrocarbon, soil toxicity, physicochemical properties of the soil, microbial population numbers, enzyme activities and microbial community structures were examined during the 90-d incubation. The results showed that the greatest degradation of total petroleum hydro- carbons (TPH) was observed with the biostimulation using mixture of NPK, HS and NovoGro, a treatment scheme that enhanced both dehydrogenase and lipase activities in soil. Introduction of exogenous hydrocarbon-degrading bacteria (in addition to biostimulation with NPK, HS and NovoGro) had negligible effect on the removal of TPH, which was likely due to the competition between exogenous and autochthonous microorganisms. None- theless, the addition of exogenous yeast-bacteria consor- tium significantly enhanced the removal of the aromatic fraction of the petroleum hydrocarbons, thus detoxifying the soil. The effect of bioaugmentation on the removal of more recalcitrant petroleum hydrocarbon fraction was likely due to the synergistic effect of bacteria and fungi. 相似文献