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931.
研究了厌氧流化床微生物燃料电池(AFB-MFC)除碳脱氮产电性能的影响因素。结果表明:(1)AFB-MFC对NH4+-N的去除不起作用。电压下降主要是由于进水有机基质浓度下降造成。(2)不添加NO3--N时,在满足AFB-MFC脱氮所需的电子供体条件下增加进水COD/TN有利于AFB-MFC产电。(3)3种无机氮共存下,AFB-MFC在进水有机碳与无机氮质量比(C/N)不低于1.37时,对COD、NO2--N和NO3--N具有理想的去除效果。AFB-MFB在一定进水C/N范围内(1.37~2.50),能得到稳定的输出电压及功率密度。(4)固定进水C/N时,AFB-MFC在高碳氮负荷下仍能得到较理想的NO2--N、NO3--N、COD去除效果,AFB-MFC对NH4+-N去除效果不明显;增加碳氮负荷,AFB-MFC输出电压及功率密度没有明显的改变。(5)有机基质浓度不变下,AFB-MFC中充足的电子供体可保证较高的NO3--N、COD去除率。AFB-MFC输出电压及功率密度随着时间延长而先增加至稳定值后下降。 相似文献
932.
933.
以模拟含油废水为处理对象,用辣根过氧化物酶(HRP)去除水中的油,研究了HRP催化氧化柴油反应的工艺条件。实验结果表明,当柴油质量浓度为120mg/L时,在H2O2质量浓度为250mg/L、HRP的酶活性浓度为0.8U/mL、废水pH为7.4、温度为27℃、反应时间为3h的最佳工艺条件下,除油率可达60.89%。实验还考察了壳聚糖和聚乙二醇(PEG)对HRP催化过程的影响。实验结果显示,壳聚糖对HRP催化过程的影响很小,PEG则有很好的强化作用,在PEG质量浓度为160mg/L时,除油率可达79.31%。 相似文献
934.
介绍了生物柴油的特性、能耗及生物柴油的制备方法(直接混合法、微乳液法、高温热裂解法、酯交换法、超临界甲醇法)和生物柴油在工业应用巾存在的主要问题,阐述了国内外生物柴油的产业发展现状,展望了该产业在我田的发展前景。 相似文献
935.
936.
垃圾填埋气(LFG)用作车辆燃料资源化现状及发展前景 总被引:8,自引:0,他引:8
介绍垃圾填埋气用作车辆燃料资源化的优点 ,应用中需解决的净化、贮存和发动机改造的关键技术问题及国外研究应用现状 ,指出在我国具有广阔的发展前景。 相似文献
937.
采用聚丙烯酰胺溶胶-凝胶法制备了A位掺杂(Cu、Ce)LaSrCoO4复合氧化物催化剂,考察了它们对CO和C3H8的催化氧化活性,并运用XRD,TPR和TPD等手段对催化剂进行了表征。结果表明,不同稀土掺杂对LaSrCoO4复合氧化物的CO和C3H8氧化活性的影响不同,Cu掺杂能增加Co3+、化学吸附氧和晶格氧的数量,提高复合氧化物的活性,而Ce则相反。 相似文献
938.
Chinese traditional medicine wastewater, rich in macromolecule and easy to foam in aerobic biodegradation such as Glycosides, was treated by two identical bench-scale aerobic submerged membrane bioreactors (SMBRs) operated in parallel under the same feed, equipped with the same electronic control backwashing device. One was used as the control SMBR (CSMBR) while the other was dosed with powdered activated carbon (PAC) (PAC-amended SMBR, PSMBR). The backwashing interval was 5 min. One suction period was about 90 min by adjusting preestablished backwashing vacuum and pump frequency. The average flux of CSMBR during a steady periodic state of 24 d (576 h) was 5.87 L/h with average hydraulic residence time (HRT) of 5.97 h and that of PSMBR during a steady periodic state of 30 d (720 h) was 5.85 L/h with average HRT of 5.99 h. The average total chemical oxygen demand (COD) removal efficiency of CSMBR was 89.29% with average organic loading rate (OLR) at 4.16 kg COD/(m^3.d) while that of PSMBR was 89.79% with average OLR at 5.50 kg COD/(m^3.d). COD concentration in the effluent of both SMBRs achieved the second level of the general wastewater effluent standard GB8978-1996 for the raw medicine material industry (300 mg/L). Hence, SMBR with electronic control backwashing was a viable process for medium-strength Chinese traditional medicine wastewater treatment. Moreover, the increasing rates of preestablished backwashing vacuum, pump frequency, and vacuum and flux loss caused by mixed liquor in PSMBR all lagged compared to those in CSMBR; thus the actual operating time of the PSMBR system without membrane cleaning was extended by up to 1.25 times in contrast with the CSMBR system, and the average total COD removal efficiency of PSMBR was enhanced with higher average OLR. 相似文献
939.
Releasing characteristics of phosphorus and other substances during thermal
treatment of excess sludge 总被引:2,自引:0,他引:2
The releasing characteristics of phosphorus,nitrogen compounds,organics,and some metal cations during thermal treatment of excess sludge were investigated.It was found that during heating not only phosphorus,but also nitrogen compounds,organics,and some metal cations could be released in abundance.The maximum orthophosphate (ortho-P) release of about 90 mg/L in concentration was observed at 50℃in 1 h.Except for volatile fatty acids (VFAs),comparatively little total nitrogen (TN),total organic carbon (TOC),and metal cations were released at the same time.Such results might favor further process of phosphorus recovery.VFAs were considerably released only at 50℃.Acetic,butyric,and propionic acid were the most abundant components in turn and their releasing profiles exhibited good linear relationship with time (R~2=0.9977,0.9624,and 0.8908,respectively).The concentrations of Mg~(2 ) and K~ increased with time and temperature during thermal treatment,but Ca~(2 ) decreased.The release of Mg~(2 ) and K~ agreed well with TP release (R~2=0.9892 and 0.9476,respectively).Temperature in the experimental range had very little impact on the linear relationships, especially of Mg~(2 ).Moreover,the parameter of mixed liquor suspended solids (MLSS) was found to be an important factor for thermal sludge treatment as the released ortho-P and total phosphorus (TP) at 50℃increased more than one-fold when MLSS was increased from 4000 to 8000 mg/L. 相似文献
940.
Jutta Geldermann Robert Gabriel Otto Rentz 《Environmental science and pollution research international》1999,6(2):115-121
The burning of kerosene in jet turbines is investigated for two reference flights with a Boeing 747-400 and an Airbus A320-200,
representing the typical Lufthansa planes for long and middle distance. The ecological evaluation is performed by Life Cycle
Assessment (LCA). Formation of condensation trails, which is a specific environmental impact caused by air traffic, has to
be considered in addition to established LCA impact categories. Based on the ecological assessment, an improvement assessment
is performed. Environmental performance of diesel fuel during the combustion in car engines is analysed based on available
publications. The relevant parameters for the environmental impact of the combustion of diesel (aromatics content, reduction
of sulphur content, the reduction of the density and raising of the cetane number) are discussed with regard to improvements
of the exhaust qualities of kerosene. A reduction of the aromatics content promises to improve the emission of soot which
should be further investigated. 相似文献