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101.
山地土壤—植物系统中汞污染问题的初步调查 总被引:2,自引:0,他引:2
调查研究表明:在山地大气、水体质量较好的环境中,柑橘(含汞量)有超标问题,其土壤汞有超背景值现象;而蔬菜土壤则无此问题,其原因可能是由于多年生植物从大气和土壤中富积微量汞的时间较一年生植物长,以及土壤中砂粒结合汞粘粒结合汞具有更高的生物活性 相似文献
102.
情景分析法在赣江流域水污染控制规划中的应用 总被引:15,自引:0,他引:15
采用在水污染控制规划中有广泛应用的情景分析法,从流域水环境功能分区出发,根据赣江流域各市县的社会经济发展规划和污染源排放量的预测结果,对流域的水污染控制设计了一系列不同的情景方案,首先通过情景水水质模拟和情景经济分析,初选出适用的方案,再运用多目标决策方法,从水质,经费,施工,社会影响等方面进行综合评定,据此定出筛选方案优劣和先后的顺序,并提出赣江流域水污染控制规划的推荐方案,研究表明,情景分析方法对于流域的整体规划的综合性,完整性,可持续性等方面具有着良好的指导意义。 相似文献
103.
Wen-Sheng Ou 《International Journal of Green Energy》2018,15(6):371-375
Taiwan government specifies that the average roof thermal transmittance must be less than 0.8 (w/(m2·k)) for the design of all residential buildings in order to implement the policy of saving energy. However, self-disciplined architects practice the design of aesthetic roof to blend in with green landscape so that they urgently expect the academia to provide roof greening technical information to support their idea of designing green roofs for residential buildings. In this research, a single-family housing unit is used for investigating the possibility of applying extensive roof greening to achieve building sustainable development. The experiment tasks focused on the soil denudation caused by rainwater washing and replenishing the soil carbon by irrigating the soil with gray water. Using tap water to irrigate the green roof for 12, 16, and 14 weeks causes nitrogen, phosphate, and potassium, respectively, to be reduced to less than the original levels, respectively. Applying gray water to irrigate the green roof soil will raise the soil fertility by improving nitrogen and phosphate but not obvious for potassium. 相似文献
104.
Modeling time-dependent toxicity to aquatic organisms from pulsed exposure of PAHs in urban road runoff 总被引:1,自引:0,他引:1
Wei ZhangYoubin Ye Yindong TongLangbo Ou Dan HuXuejun Wang 《Environmental pollution (Barking, Essex : 1987)》2011,159(2):503-508
Understanding of the magnitude of urban runoff toxicity to aquatic organisms is important for effective management of runoff quality. In this paper, the aquatic toxicity of polycyclic aromatic hydrocarbons (PAHs) in urban road runoff was evaluated through a damage assessment model. Mortality probability of the organisms representative in aquatic environment was calculated using the monitored PAHs concentration in road runoff. The result showed that the toxicity of runoff in spring was higher than those in summer. Analysis of the time-dependent toxicity of series of runoff water samples illustrated that the toxicity of runoff water in the final phase of a runoff event may be as high as those in the initial phase. Therefore, the storm runoff treatment systems or strategies designed for capture and treatment of the initial portion of runoff may be inappropriate for control of runoff toxicity. 相似文献
105.
K.‐Y. Chung D.W. Dickson L.‐T. Ou 《Journal of environmental science and health. Part. B》2013,48(5):749-768
Abstract The fumigant 1,3‐dichloropropene (1,3‐D) is considered to be a potential alternative to methyl bromide. The degradation rates of cis‐ and trans‐l,3‐D in soil from a treated site during three successive annual applications of 1,3‐D progressively increased with an increase in the number of annual applications. The enhancement was greater for trans‐l,3‐D degradation than cis‐l,3‐D. In untreated soil, the degradation rates of the two isomers were similar. The enhancement lasted slightly longer than 2 years after annual field application of 1,3‐D had ceased. A single field reapplication of 1,3‐D to the treated site that had not been treated for 2 years resulted in resumed differential enhanced degradation of cis‐ and trans‐l,3‐D. Microorganisms were responsible for the enhanced degradation. 相似文献
106.
L.‐T. Ou 《Journal of environmental science and health. Part. B》2013,48(6):661-674
Abstract Degradation of the nematicide Telone II (cis‐ and trans‐1,3‐dichloropropene comprise the active ingredients) in soil was studied using 14C‐l,3‐dichloropropene (DCP) along with soil samples collected from a field test site near Quincy, Florida. A mixed bacterial culture isolated from the soil in the presence of a second carbon source, glucose or yeast extract, completely degraded 14C‐DCP to 14CO2, water‐soluble products, and microbial mass. 14C‐DCP in soil was also degraded to 14CO2. After 28 days of incubation, the labeled chemical was completely degraded to 14CO2, water‐soluble metabolites, bound‐residues, and possibly some microbial mass. Little or no difference was observed in the degradation of 14C‐DCP in soil samples collected one week prior to field application of Telone II, or two weeks and two years after application. 相似文献
107.
He Yuejun Cornelissen Johannes H. C. Wang Pengpeng Dong Ming Ou Jing 《Environmental science and pollution research international》2019,26(9):8828-8837
Environmental Science and Pollution Research - The formation of a common mycorrhizal network (CMN) between roots of different plant species enables nutrient transfers from one plant to another and... 相似文献
108.
Methyl bromide, a pre-emergent soil fumigant, is scheduled to be phased out in the US by 2005, with exceptions for critical use. Comparison of some of the physical constants related to distribution and retention for methyl bromide (MBr) to other fumigants yields a useful quantification of possible alternatives. In this study, the atmospheric and subsurface dissipation of methyl bromide as well as (Z)- and (E)-1,3-dichloropropene (1,3-D) isomers in Telone II were examined. The Henry's law constants of the three chemicals at soil temperature and their mass transfer coefficients for movement through an agricultural mulch of UV-resistant, high-density polyethylene (PE) were evaluated using field data. At the soil temperature of 16.4 degrees C, calculated Henry's law constant gave a fumigant ranking of MBr (0.21)>(Z)-1,3-D (0.041)>(E)-1,3-D (0.027). Since rapid subsurface distribution of a fumigant is highly dependent on the amount in the gas phase, the greater value for Henry's law constant implies faster distribution throughout the soil. After distribution through the soil, retention of the fumigant becomes imperative. Calculation of the fumigant's mass transfer coefficients through PE from field data gave a ranking of the three chemicals: MBr (1.08 cm/h)<(E)-1,3-D (3.25 cm/h)<(Z)-1,3-D (4.13 cm/h). With mass transfer coefficients of this magnitude, it was concluded that PE film was an inadequate barrier for retaining these fumigants in an agricultural setting. 相似文献
109.
Jinping Ou Qihou Hu Haoran Liu Shiqi Xu Z.huang Wang Xiangguang Ji Xinqi Wang Zhouqing Xie Hui Kang 《环境科学学报(英文版)》2022,34(1):75-83
New particle formation(NPF) events are an increasingly interesting topic in air quality and climate science. In this study, the particle number size distributions, and the frequency of NPF events over Hefei were investigated from November 2018 to February 2019. The proportions of the nucleation mode, Aitken mode, and accumulation mode were 24.59%,53.10%, and 22.30%, respectively, which indicates the presence of abundant ultrafine particles in Hefei. Forty-six NPF events occurred during the obser... 相似文献
110.
贵州高原水库百花湖富营养化特征分析 总被引:2,自引:0,他引:2
为了解贵州高原水库百花湖的富营养化特征,于2011年5月(平水期)、8月(丰水期)、11月(枯水期)对水体富营养化特征的主要指标及环境因子进行采样调查与分析。结果表明:2011年百花湖水库呈富营养型(TSI M>50)3个时期富营养化状态指数表现为丰水期>枯水期>平水期。百花湖水库的总氮(TN)、总磷(TP)和Chl-a表底层浓度的平均值分别为1.48~1.61 mg/L、0.04~0.07 mg/L、20.27~10.41 mg/m3;透明度(SD)为0.60~1.80 m。水体中Chl-a浓度与TN、TP浓度呈负相关和极不明显的关系,与NO-+-2-N、NH4-N浓度呈极显著负相关,与NO 3-N呈负相关,与水温呈正相关,与pH和DO呈极显著的正相关。 相似文献