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311.
地衣芽孢杆门菌(Bacillus licheniformis)对Cr^6+的吸附动力学研究 总被引:1,自引:0,他引:1
从污染土壤中分离出地衣芽孢杆菌(Bacillus licheniformis),利用其死菌体对Cr^6+溶液进行吸附动力学研究.在Ci=300mg/L、pH=2.5和日=50℃条件下,吸附120min获得最大吸附量60.5mg/g.应用Langmuir和Freundlich吸附等温线研究,结果表明,Langmuir吸附等温线更为适合.动力学研究显示,地衣芽孢杆菌对Cr^6+的吸附动力学可以用拟二级速度方程进行描叙.图3表4参14 相似文献
312.
The hydrogeochemical characterization of Coxilha das Lombas Aquifer, Brazil, was studied. Chemical characteristics from 23
groundwater samples and meteoric waters data from public registers were used. The ionic speciation and mineral dissolution/precipitation
was calculated by EQ3/6 package software. The results showed low total dissolved solids (TDS) values and slightly acidic pH.
The concentration of most abundant ions usually followed this trend Cl−>HCO3
+>SO4
2−>Na+. The characteristics of groundwaters and the chemistry similarity with the meteoric waters reflect their short residence
time, due to high hydraulic conductivity, and low degree of water/rock interactions, due to sands composed mainly of quartz. 相似文献
313.
314.
Column experiments to study nonlinear removal of bacteriophages by passage through saturated dune sand 总被引:1,自引:0,他引:1
In a recent field study on dune recharge, bacteriophages MS2 and PRD1 were found to be removed 3 log10 over the first 2.4 m and only 5 log10 over the next 27 m. To understand the causes of this nonlinear removal, column experiments were carried out under conditions similar to the field: same recharge water, temperature (5 +/- 3 degrees C) and pore water velocity (1.5 m day(-1)). Soil samples were taken along a streamline between the recharge canal and the first monitoring well. Bacteriophage phiX174 was included for comparison. The high initial removal in the field was found not to be due to heterogeneity of phage suspensions but to soil heterogeneity. Phage removal rates correlated strongly positively with soil organic carbon content, and relatively strongly positively with silt content and the presence of ferric oxyhydroxides. Soil organic carbon content, silt content and the presence of ferric oxyhydroxides were found to decrease exponentially with travel distance. Removal rates of phiX174 were found to be 3-10 times higher than those of MS2 and PRD1 due to the lower electrostatic repulsion that the less negatively charged phiX174 experiences. It is suggested that the high initial removal in the field is due to the presence of favorable sites for attachment formed by ferric oxyhydroxides that decrease exponentially with travel distance. Similar removal rates may be found at both laboratory and field scale. However, due to local variations at field scale detailed knowledge on soil heterogeneity may be needed to enable a reliable prediction of removal. 相似文献
315.
介绍了地表水监测分析中对Cr6 测定方法的改进,通过活性炭吸附预处理后的水样消除水样中色度的干扰,并对活性炭的用量进行了分析,确定了活性炭的用量,以及对显色剂的改进.对基层监测站Cr6 测定有实际意义. 相似文献
316.
在pH<1的溶液中,用甲基异丁酮(MIBK)与磷酸三丁酯(TBP)混合作为萃取剂,萃取废水中的铬时,六价铬的分配比为108.6,而三价铬几乎不被萃取。用原子吸收分光光度计测定有机相中的六价铬具有很好的选择性,且干扰少,灵敏度高。工作曲线的最佳浓度范围是:0.04~4.00mg/L。 相似文献
317.
J. L. Yaek Y. Li P. J. Lemanski P. C. Begeman S. W. Rouhana J. M. Cavanaugh 《Traffic injury prevention》2016,17(5):535-543
Objectives: The objective of this study was to assess and compare the current lateral impact biofidelity of the shoulder, thorax, abdomen, and pelvis of the Q6, Q6s, and Hybrid III (HIII) 6-year-old anthropomorphic test devices (ATDs) through lateral impact testing.Methods: A series of lateral impact pendulum tests, vertical drop tests, and Wayne State University (WSU) sled tests was performed, based on the procedures detailed in ISO/TR 9790 (1999) and scaling to the 6-year-old using Irwin et al. (2002). The HIII used in this study was tested with the Ford-designed abdomen described in Rouhana (2006) and Elhagediab et al. (2006). The data collected from the 3 different ATDs were filtered using SAE J211 (SAE International 2003), aligned using the methodology described by Donnelly and Moorhouse (2012), and compared for each body region tested (shoulder, thorax, abdomen, and pelvis). The biofidelity performance in lateral impact for the 3 ATDs was assessed against the scaled biofidelity targets published in Irwin et al. (2002), the abdominal biofidelity target suggested in van Ratingen et al. (1997), and the biofidelity targets published in Rhule et al. (2013). Regional and overall biofidelity rankings for each of the 3 ATDs were performed using both the ISO 9790 biofidelity rating system (ISO/TR 9790 1999) and the NHTSA's external biofidelity ranking system (BRS; Rhule et al. 2013).Results: All 3 6-year-old ATD's pelvises were rated as least biofidelic of the 4 body regions tested, based on both the ISO and BRS biofidelity rating systems, followed by the shoulder and abdomen, respectively. The thorax of all 3 ATDs was rated as the most biofidelic body region using the aforementioned biofidelity rating systems. The HIII 6-year-old ATD was rated last in overall biofidelity of the 3 tested ATDs, based on both rating systems. The Q6s ATD was rated as having the best overall biofidelity using both rating systems.Conclusions: All 3 ATDs are more biofidelic in the thorax and abdomen than the shoulder and pelvis, with the pelvis being the least biofidelic of all 4 tested body regions. None of the 3 tested 6-year-old ATDs had an overall ranking of 2.0 or less, based on the BRS ranking. Therefore, it is expected that none of the 3 ATDs would mechanically respond like a postmortem human subject (PMHS) in a lateral impact crash test based on this ranking system. With respect to the ISO biofidelity rating, the HIII dummy would be considered unsuitable and the Q-series dummies would be considered marginal for assessing side impact occupant protection. 相似文献
318.
采用电晕放电等离子体协同钨酸铋降解水中的邻苯二甲酸二甲酯.利用水热法合成γ-Bi2WO6,通过XRD、SEM、TEM和XRF对合成产物进行了结构、形貌及成分分析,结果表明:合成的催化剂是一种高纯度、高结晶度的涡旋状纳米材料.以邻苯二甲酸二甲酯为目标污染物,探究了等离子体放电和钨酸铋光催化的协同效果及输出功率、催化剂量、催化剂重复使用次数、羟基自由基清除剂对邻苯二甲酸二甲酯去除率的影响.结果表明:电晕放电等离子体和钨酸铋光催化有明显的协同作用,在放电功率50 W、初始浓度100 mg·L~(-1)、空气流速2 L·h-1、钨酸铋添加量为0.7 g·L~(-1)、初始p H 6.31、初始电导率4.05μS·cm-1的条件下,反应30 min,邻苯二甲酸二甲酯的去除率可高达到90%.反应过程中,钨酸铋催化剂表现出低吸附性、高沉降性和较好的重复利用效果.加入羟基自由基清除剂可一定程度的抑制邻苯二甲酸二甲酯的降解. 相似文献
319.
采用"溶剂热-光还原"法成功制备出Bi_2MoO_6-Pt异质结光催化剂.该催化剂由Bi_2MoO_6三维微球(直径:1~4μm)和Pt纳米颗粒(~2.5nm)组成.本文以罗丹明B(Rh B)和4-氯酚(4-CP)为目标污染物研究了该异质结的可见光光催化性能.Bi_2MoO_6-Pt异质结的光催化活性明显高于纯Bi_2MoO_6,Pt的最佳负载量为0.3 wt%.同时,Bi_2MoO_6-Pt-2异质结(Pt的负载量为0.3 wt%)也可以有效地矿化有机污染物.更重要的是,Bi_2MoO_6-Pt-2异质结具有良好的稳定性,可以被重复使用. 相似文献
320.