全文获取类型
收费全文 | 238篇 |
免费 | 1篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 11篇 |
废物处理 | 22篇 |
环保管理 | 18篇 |
综合类 | 21篇 |
基础理论 | 28篇 |
污染及防治 | 118篇 |
评价与监测 | 12篇 |
社会与环境 | 6篇 |
灾害及防治 | 6篇 |
出版年
2023年 | 3篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2019年 | 2篇 |
2018年 | 4篇 |
2017年 | 10篇 |
2016年 | 8篇 |
2015年 | 1篇 |
2014年 | 4篇 |
2013年 | 30篇 |
2012年 | 13篇 |
2011年 | 15篇 |
2010年 | 15篇 |
2009年 | 14篇 |
2008年 | 17篇 |
2007年 | 13篇 |
2006年 | 14篇 |
2005年 | 14篇 |
2004年 | 13篇 |
2003年 | 12篇 |
2002年 | 9篇 |
2001年 | 5篇 |
2000年 | 7篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1995年 | 3篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
排序方式: 共有242条查询结果,搜索用时 15 毫秒
21.
本文阐述了运用生态工艺,成功地将工艺组成一套占地少、操作简便、外形美观的机械设备,治理了广元电子灯饰总厂的漆雾废气。治理后,其排放浓度,低于《四川省标准》的任一标准值。 相似文献
22.
23.
24.
Wen-Tien Tsai 《Journal of Cleaner Production》2010,18(14):1440-1445
The objective of this paper was to provide a preliminary analysis of energy utilization from industrial waste in Taiwan, a densely populated island country with high dependence on imported energy. The discussion thus focused on the status of industrial waste generation and its management since the year 2002. This paper also presented the updated information about the new/revised regulations concerning the governmental regulations and policies for promoting industrial waste as energy source as well as controlling the emissions of hazardous air pollutants from industrial waste-to-energy facilities. It showed that the main types of combustible waste in the industrial sector of Taiwan include pulp sludge, scrap wood, sugarcane bagasse, textile sludge and scrap plastics, which were being reused as auxiliary fuel in the utilities (e.g., boiler and incinerator). Based on their reported quantities, the energy potential and the environmental benefit of mitigating CO2 emissions were also analyzed in the study. 相似文献
25.
The effects of the aeration, seeding, and agitation on the composting of vegetable waste were studied in a laboratory-scale reactor. Experimental results showed that the final product at the end of a 4-day composting period met multiple maturity indices suggested by many researchers. The evolution of carbon dioxide during the composting process could be modelled with a modified Gompertz equation that described the bacteria growth successfully. Multivariate regression analysis was used to study the effects of operating parameters on the carbon conversion. The response surface contour plots were constructed using the regression equation for the examination of the dependence of carbon conversion on operating parameters. The maximum carbon conversion of 14.54% was obtained when the percentage of seeding was set at 14.5%, the air suction rate was set at 2.6 L kg(-1) dry-solid min(-1), and the agitator operated half of the time, alternating on and off for every 5 min. Future work will focus on the application of the data and the experience gained in this work to composters of pilot and semi-commercial scales. 相似文献
26.
Pei-Yi Lin Yi-Ya Fang Su-Ping Wang Mei-Yun Tai Yuan-Feen Tsai 《Die Naturwissenschaften》2012,99(3):185-189
After extinction, the reappearance of a conditioned response induced by an unconditioned stimulus which is weaker than that
used during the conditioning training indicates that the extinction procedure does not eliminate the original conditioned
memory. Recent studies on fear conditioning have shown that rats exhibited little or no recovery of conditioned responding
if the time interval between fear acquisition and extinction was short, suggesting that the extinction process may erase the
original conditioning trace in this situation. In the present study, a saving experiment was conducted in rats to investigate
whether an aversive response could be recovered following extinction training with different time intervals after acquisition
of conditioned taste aversion (CTA). Male Long–Evans rats developed CTA by associating a 0.2% sucrose solution with malaise
induced by intraperitoneal injection of 4 ml/kg 0.15 M LiCl and were subjected to extinction training with an interval of
5 h (5H group) or 24 h (24H group) after acquisition of CTA. Rats in the 5H group, but not in the 24H group, exhibited no
aversive responding to the sucrose solution followed by the injection of a lower dose of LiCl (1 ml/kg). These findings indicate
that the extinction procedure administered at different time points following the acquisition of CTA affects recovery of extinguished
aversive memory and suggest that an unlearning process may be involved in the mechanisms of CTA extinction with short intervals
between acquisition and extinction. 相似文献
27.
Tsai MY Chen KS Wu CH 《Journal of the Air & Waste Management Association (1995)》2005,55(8):1178-1189
Effects of excess ground and building temperatures on airflow and dispersion of pollutants in an urban street canyon with an aspect ratio of 0.8 and a length-to-width ratio of 3 were investigated numerically. Three-dimensional governing equations of mass, momentum, energy, and species were modeled using the RNG k-epsilon turbulence model and Boussinesq approximation, which were solved using the finite volume method. Vehicle emissions were estimated from the measured traffic flow rates and modeled as banded line sources, with a street length and bandwidths equal to typical vehicle widths. Both measurements and simulations reveal that pollutant concentrations typically follow the traffic flow rate; they decline as the height increases and are higher on the leeward side than on the windward side. Three-dimensional simulations reveal that the vortex line, joining the centers of cross-sectional vortexes of the street canyon, meanders between street buildings and shifts toward the windward side when heating strength is increased. Thermal boundary layers are very thin. Entrainment of outside air increases, and pollutant concentration decreases with increasing heating condition. Also, traffic-produced turbulence enhances the turbulent kinetic energy and the mixing of temperature and admixtures in the canyon. Factors affecting the inaccuracy of the simulations are addressed. 相似文献
28.
The impacts of the aeration and the agitation on the composting process of synthetic food wastes made of dog food were studied in a laboratory-scale reactor. Two major peaks of CO(2) evolution rate were observed. Each peak represented an independent stage of composting associated with the activities of thermophilic bacteria. CO(2) evolutions known to correlate well with microbial activities and reactor temperatures were fitted successfully to a modified Gompertz equation, which incorporated three biokinetic parameters, namely, CO(2) evolution potential, specific CO(2) evolution rate, and lag phase time. No parameters that describe the impact of operating variables are involved. The model is only valid for the specified experimental conditions and may look different with others. The effects of operating parameters such as aeration and agitation were studied statistically with multivariate regression technique. Contour plots were constructed using regression equations for the examination of the dependence of CO(2) evolution potentials on aeration and agitation. In the first stage, a maximum CO(2) evolution potential was found when the aeration rate and the agitation parameter were set at 1.75 l/kg solids-min and 0.35, respectively. In the second stage, a maximum existed when the aeration rate and the agitation parameter were set at 1.8 l/kg solids-min and 0.5, respectively. The methods presented here can also be applied for the optimization of large-scale composting facilities that are operated differently and take longer time. 相似文献
29.
Distribution of PCDD/F (polychlorinated dibenzo-p-dioxin and polychlorinated dibenzofuran) congeners at two electric arc furnaces (EAFs) in Taiwan is evaluated via intensive stack sampling and analysis. Two kinds of exhaust system in EAFs including stack system and shutter system are selected for measuring dioxin emissions. In addition, dioxin emissions during oxidation and reduction stages at EAF-A were characterized. Results indicate that the PCDD/F concentration of stack gas in EAF-A was 4.39 ng/N m3 while total Toxic Equivalent Quantity (TEQ) concentration was 0.35 ng I-TEQ/N m3. The PCDD/F concentration of stack gas in EAF-B was 2.20 ng/N m3 and the TEQ concentration was 0.14 ng I-TEQ/N m3. 1,2,3,4,6,7,8-HpCDF, OCDD and OCDF are the major contributors of the dioxin concentrations for two EAFs investigated and the percentage of PCDD/F in particulate phase increases as the chlorination level of the PCDD/F congener increases. The results obtained on gas/particulate partitioning of PCDD/Fs in flue gases prior to the APCD in EAFs indicate that more than 90% exists in particulate phase. In EAF-A, the PCDD/F concentration during oxidation stage is slightly higher than that measured during reduction stage, including the sampling points of CO converter outlet, prior to bag filter and stack. Majority of PCDD/Fs emitted from steel-making processes exists in particulate-phase (about 60–70%) at both EAFs investigated. 相似文献
30.
Sulfur hexafluorine compound (SF6), trifluoromethane (CHF3) and diclorodifluoromethane (CCl2F2) are extensively used in the semiconductor industry. They are global warming gases. Most studies have addressed the effective decomposition of fluorine compounds, rather than the toxicity of decomposed by-products. Hence, the concepts of toxicity equivalents (TEQs) were applied in this work. The results indicated that HF and SiF4 were the two greatest contributors of TEQ to the SF6/H2/Ar plasma system, while F2 and SiF4 were the two greatest contributors to the SF6/O2/Ar system. Additionally, SiF4 and HF were the two greatest contributors of TEQ to both the CHF3/H2/Ar and CHF3/O2/Ar plasma systems. HF and HCl were the two greatest contributors of TEQ to the CCl2F2/H2/Ar plasma system, and Cl2 and COCl2 were the two greatest contributors to the CCl2F2/O2/Ar system. HCl and HF can be recovered using wet scrubbing, which reduces the toxicity of these emission gases. Consequently, the hydrogen-based plasma system was a better alternative for treating gases that contained SF6, CHF3 and CCl2F2 from the TEQs point of view. 相似文献