全文获取类型
收费全文 | 262篇 |
免费 | 0篇 |
国内免费 | 6篇 |
专业分类
安全科学 | 5篇 |
废物处理 | 18篇 |
环保管理 | 20篇 |
综合类 | 21篇 |
基础理论 | 44篇 |
环境理论 | 1篇 |
污染及防治 | 134篇 |
评价与监测 | 13篇 |
社会与环境 | 9篇 |
灾害及防治 | 3篇 |
出版年
2023年 | 3篇 |
2022年 | 7篇 |
2021年 | 6篇 |
2020年 | 4篇 |
2019年 | 3篇 |
2018年 | 5篇 |
2017年 | 12篇 |
2016年 | 4篇 |
2015年 | 4篇 |
2014年 | 6篇 |
2013年 | 41篇 |
2012年 | 12篇 |
2011年 | 19篇 |
2010年 | 13篇 |
2009年 | 9篇 |
2008年 | 11篇 |
2007年 | 19篇 |
2006年 | 22篇 |
2005年 | 10篇 |
2004年 | 13篇 |
2003年 | 9篇 |
2002年 | 7篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1978年 | 2篇 |
排序方式: 共有268条查询结果,搜索用时 203 毫秒
181.
Dichloromethane (DCM, also known as methylene chloride [CH2Cl2]) is often present in industrial waste gas and is a valuable chemical product in the chemical industry. This study addresses the oxidation of airstreams that contain CH2Cl2 by catalytic oxidation in a tubular fixed-bed reactor over perovskite-type oxide catalysts. This work also considers how the concentration of influent CH2Cl2 (Co = 500-1000 ppm), the space velocity (GHSV = 5000-48,000 1/hr), the relative humidity (RH = 10-70%) and the concentration of oxygen (O2 = 5-21%) influence the operational stability and capacity for the removal of CH2Cl2. The surface area of lanthanum (La)-cobalt (Co) composite catalyst was the greatest of the five perovskite-type catalysts prepared in various composites of La, strontium, and Co metal oxides. Approximately 99.5% CH2Cl2 reduction was achieved by the catalytic oxidation over LaCoO3-based perovskite catalyst at 600 degrees C. Furthermore, the effect of the initial concentration and reaction temperature on the removal of CH2Cl2 in the gaseous phase was also monitored. This study also provides information that a higher humidity corresponds to a lower conversion. Carbon dioxide and hydrogen chloride were the two main products of the oxidation process at a relative humidity of 70%. 相似文献
182.
Fe (III) supported on resin as effective catalyst for the heterogeneous oxidation of phenol in aqueous solution 总被引:4,自引:0,他引:4
FeIII supported on resin as an effective catalyst for oxidation was prepared and applied for the degradation of aqueous phenol. Phenol was selected as a model pollutant and the catalytic oxidation was carried out in a batch reactor using hydrogen peroxide as the oxidant. The influent factors on oxidation, such as catalyst dosage, H2O2 concentration, pH, and phenol concentration were examined by considering both phenol conversion and chemical oxygen demand (COD) removal. The FeIII-resin catalyst possesses a high oxidation activity for phenol degradation in aqueous solution. The experimental results of this study show that almost 100% phenol conversion and over 80% COD removal can be achieved with the FeIII-resin catalyst catalytic oxidation system. A series of prepared resin were investigated for improving the oxidation efficiency. It was found that the reaction temperature and initial pH in solution significantly affected both of phenol conversion and COD removal efficiency. The activity of the catalyst significantly decreased at high pH, which was similar to the Fenton-like reaction mechanism. Results in this study indicate that the FeIII-resin catalytic oxidation process is an efficient method for the treatment of phenolic wastewater. 相似文献
183.
Hung WT Tong HY Cheung CS 《Journal of the Air & Waste Management Association (1995)》2005,55(10):1431-1440
This study reports on the analysis of emissions and fuel consumption from motor vehicles using a modal approach. The four standard driving modes are idling, accelerating, cruising, and decelerating. On-road data were collected using instrumented test vehicles traveling many times through the urban areas of Hong Kong. A model was developed for estimating vehicular fuel consumption and emissions as a function of instantaneous speed and driving mode. Piecewise interpolation functions were proposed for each nonidling driving mode. Idling emission and fuel consumption rates were estimated as negative exponential functions of idling time. Preliminary modeling results showed good agreements for the test vehicles and indicated that the on-road measurements are feasible for the development of modal emission and fuel consumption models. 相似文献
184.
Environmental contamination from electronic waste recycling at Guiyu, southeast China 总被引:4,自引:0,他引:4
Anna Leung Zong Wei Cai Ming Hung Wong 《Journal of Material Cycles and Waste Management》2006,8(1):21-33
The disposal, recycling, and part salvaging of discarded electronic devices such as computers, printers, televisions, and
toys are now creating a new set of waste problems. This study is aimed at identifying the sources and quantifying the pollution
levels generated from electronic waste (e-waste) activities at Guiyu, Guangdong Province, China, and their potential impacts
on the environment and human health. The preliminary results indicate that total polycyclic aromatic hydrocarbons (PAHs) in
soil obtained from a printer roller dump site was 593 μg/kg dry weight (dry wt.) and in sediment from a duck pond, the PAH
concentration was 514 μg/kg (dry wt.). Sediment from the Lianjiang River was found to be contaminated by polychlorinated biphenyls
(743 μg/kg) at a level approaching three times the Canadian Environmental Quality Guidelines probable effect level of 277 μg/kg.
Total mono- to hepta-brominated diphenyl ether homologue concentrations (1140 and 1169 μg/kg dry wt.) in soils near dumping
sites were approximately 10–60 times those reported for other polybrominated diphenyl ether-contaminated locations in the
world. In-house study on the open burning of cable wires showed extremely high levels of polychlorinated dibenzo-p-dioxins and dibenzofurans resulting in 12419 ng toxic equivalents (TEQ)/kg of waste input and 15 610 ng TEQ/kg for two separate
tests, respectively, which were about three orders of magnitude higher than those for the open burning of household waste.
High levels of Cu (712, 528, and 496 mg/kg), exceeding the new Dutch list action value, were determined for soil near the
printer roller dumping area, sediment from Lianjiang River, and soil from a plastic burn site, respectively. A more thorough
study is underway to elucidate the extent of contamination of toxic pollutants in different ecological compartments to establish
whether these pollutants are bioaccumulated and biomagnified through food chains. Assessments of human health impacts from
oral intake, inhalation, and dermal contact will be subsequently investigated.
An erratum to this article is available at. 相似文献
185.
用溶胶-凝胶法制备了锆改性纳米二氧化钛光催化剂,并用XRD、UV-vis、BET等测定技术对所制得的粉体试样进行了表征。同时以甲基橙及苯酚为模拟污染物,评价了改性后纳米二氧化钛的光催化性能,发现其光催化活性大大高于未改性二氧化钛粉体,并得出当n(Zr)/n(Ti)=5/300时,锆改性纳米二氧化钛样品的光催化活性最高。 相似文献
186.
Study of fine sediments for making lightweight aggregate. 总被引:1,自引:0,他引:1
The objective of this study was to investigate the recycling of the fine sediments of Shih-Men Reservoir to manufacture lightweight aggregate. By qualitative and quantitative analysis of the fine sediment and sintered aggregate through soil test, X-ray fluorescence, X-ray diffraction and scanning electron microscopy, a strategy of recycling fine sediment as aggregate for other similar material is proposed. The test results indicate that such fine sediment can be classified as low plastic clay, and clay of such chemical composition is located in the Riley's 'area of bloating'. The particle density of sintered lightweight aggregate decreases when the sintering temperature increases especially above 1200 degrees C due to phase transformation and formation of a vitrified layer on the surface through subsequent dehydration, bloating and collapsing stages. Our findings show that the fine sediment of Shin-Men Reservoir could be a suitable raw material for making expanded lightweight aggregate sintered at 1200 to 1300 degrees C for 10 to 12 min by a programmable furnace and a diffusion process. 相似文献
187.
188.
Junli Hu Jintian Li Fuyong Wu Shengchun Wu Zhihong Ye Xiangui Lin Ming Hung Wong 《Environmental science and pollution research international》2013,20(12):8457-8463
A post-harvest experiment was conducted further to our previous greenhouse pot study on upland kangkong (Ipomoea aquatica Forsk.) and Alfred stonecrop (Sedum alfredii Hance) intercropping system in Cd-contaminated soil inoculated with arbuscular mycorrhizal (AM) fungi. Previously, four treatments were established in the intercropping experiment, including monoculture of kangkong (control), intercropping with stonecrop (IS), and IS plus inoculation with Glomus caledonium (IS?+?Gc) or Glomus versiforme (IS?+?Gv). Both kangkong and stonecrop plants were harvested after growing for 8 weeks. Then, the tested soils were reclaimed for growing post-harvest kangkong for 6 weeks. In the post-harvest experiment, there were no significant differences between the IS and control treatments, except for a significantly decreased (p?<?0.05) soil available P concentration with IS treatment. Compared with IS, both IS?+?Gc and IS?+?Gv significantly decreased (p?<?0.05) soil DTPA-extractable (phytoavailable) Cd concentrations, but not total Cd, by elevating soil pH, causing significantly lower (p?<?0.05) Cd concentrations in both the root and shoot of kangkong. In addition, both Gc and Gv significantly increased (p?<?0.05) soil acid phosphatase activities and available P concentrations and hence resulted in significantly higher (p?<?0.05) plant P acquisitions. However, only Gv significantly increased (p?<?0.05) kangkong yield, while Gc only significantly elevated (p?<?0.05) the shoot P concentration. It suggested that AM fungi have played key roles in Cd stabilization and P mobilization in the intercropping system, and such positive responses seemed to be sustainable and valuable in post-harvest soils. 相似文献
189.
Measurements of semi-volatile organic chemicals (SVOCs) were compared among 21 laboratories from 7 countries through the analysis of standards, a blind sample, an air extract, and an atmospheric dust sample. Measurement accuracy strongly depended on analytes, laboratories, and types of standards and samples. Intra-laboratory precision was generally good with relative standard deviations (RSDs) of triplicate injections <10% and with median differences of duplicate samples between 2.1 and 22%. Inter-laboratory variability, measured by RSDs of all measurements, was in the range of 2.8-58% in analyzing standards, and 6.9-190% in analyzing blind sample and air extract. Inter-laboratory precision was poorer when samples were subject to cleanup processes, or when SVOCs were quantified at low concentrations. In general, inter-laboratory differences up to a factor of 2 can be expected to analyze atmospheric SVOCs. When comparing air measurements from different laboratories, caution should be exercised if the data variability is less than the inter-laboratory differences. 相似文献
190.
Hung NT Ketzel M Jensen SS Oanh NT 《Journal of the Air & Waste Management Association (1995)》2010,60(11):1315-1326
In many metropolitan areas, traffic is the main source of air pollution. The high concentrations of pollutants in streets have the potential to affect human health. Therefore, estimation of air pollution at the street level is required for health impact assessment. This task has been carried out in many developed countries by a combination of air quality measurements and modeling. This study focuses on how to apply a dispersion model to cities in the developing world, where model input data and data from air quality monitoring stations are limited or of varying quality. This research uses the operational street pollution model (OSPM) developed by the National Environmental Research Institute in Denmark for a case study in Hanoi, the capital of Vietnam. OSPM predictions from five streets were evaluated against air pollution measurements of nitrogen oxides (NO(x)), sulfur dioxide (SO2), carbon monoxide (CO), and benzene (BNZ) that were available from previous studies. Hourly measurements and passive sample measurements collected over 3-week periods were compared with model outputs, applying emission factors from previous studies. In addition, so-called "backward calculations" were performed to adapt the emission factors for Hanoi conditions. The average fleet emission factors estimated can be used for emission calculations at other streets in Hanoi and in other locations in Southeast Asia with similar vehicle types. This study also emphasizes the need to further eliminate uncertainties in input data for the street-scale air pollution modeling in Vietnam, namely by providing reliable emission factors and hourly air pollution measurements of high quality. 相似文献