全文获取类型
收费全文 | 654篇 |
免费 | 14篇 |
国内免费 | 9篇 |
专业分类
安全科学 | 21篇 |
废物处理 | 59篇 |
环保管理 | 81篇 |
综合类 | 52篇 |
基础理论 | 157篇 |
环境理论 | 1篇 |
污染及防治 | 229篇 |
评价与监测 | 47篇 |
社会与环境 | 12篇 |
灾害及防治 | 18篇 |
出版年
2022年 | 8篇 |
2021年 | 9篇 |
2020年 | 5篇 |
2019年 | 9篇 |
2018年 | 14篇 |
2017年 | 19篇 |
2016年 | 20篇 |
2015年 | 14篇 |
2014年 | 26篇 |
2013年 | 58篇 |
2012年 | 37篇 |
2011年 | 35篇 |
2010年 | 24篇 |
2009年 | 38篇 |
2008年 | 36篇 |
2007年 | 49篇 |
2006年 | 29篇 |
2005年 | 24篇 |
2004年 | 25篇 |
2003年 | 23篇 |
2002年 | 18篇 |
2001年 | 16篇 |
2000年 | 9篇 |
1999年 | 11篇 |
1998年 | 7篇 |
1997年 | 3篇 |
1996年 | 6篇 |
1995年 | 4篇 |
1994年 | 6篇 |
1993年 | 6篇 |
1992年 | 3篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 6篇 |
1988年 | 6篇 |
1987年 | 7篇 |
1986年 | 5篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 5篇 |
1981年 | 2篇 |
1979年 | 7篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1974年 | 2篇 |
1973年 | 2篇 |
1972年 | 3篇 |
1971年 | 3篇 |
1970年 | 4篇 |
1967年 | 3篇 |
排序方式: 共有677条查询结果,搜索用时 296 毫秒
31.
Joong Hoon Kim Zong Woo Geem Eung Seok Kim 《Journal of the American Water Resources Association》2001,37(5):1131-1138
ABSTRACT: A newly developed heuristic algorithm, Harmony Search, is applied to the parameter estimation problem of the nonlinear Muskingum model. Harmony Search found better values of parameters in the nonlinear Muskingum model than five other methods including another heuristic method, genetic algorithm, in terms of SSQ (the sum of the square of the deviations between the observed and routed outflows), SAD (the sum of the absolute value of the deviations between the observed and routed outflows), DPO (deviations of peak of routed and actual flows), and DPOT (deviations of peak time of routed and actual outflow). Harmony Search also has the advantage that it does not require the process of assuming the initial values of design parameters. The sensitivity analysis of Harmony Memory Considering Rate showed that relatively large values of Harmony Memory Considering Rate makes the Harmony Search converge to a better solution. 相似文献
32.
Hoon Chae Park Hang Seok Choi Yeon-Ho Kwak 《Journal of Material Cycles and Waste Management》2017,19(3):1077-1084
To investigate heat transfer of char from waste tire pyrolysis, the cooling of char was simulated by the computational fluid dynamics. To scrutinize the heat transfer characteristics, bed height, temperature of cooling wall, and mixing time were selected as calculation parameters. From the results, increasing the char bed height from 0.005 to 0.02 m, the total heat transfer is decreased as from 45.5 to 26.5 J. As the char bed height is further increased from 0.02 to 0.06 m, the total heat transfer is decreased from 26.5 to 9.1 J. The char bed height affects the total heat transfer significantly. The total heat transfer decreases from 15.9 to 14.0 J as the temperature of cooling wall increases from 273.15 to 323.15 K. The total heat transfer mildly depends on the temperature of cooling wall. The particle mixing time increases from 10 to 120 s and the total heat transfer decreases from 28.6 to 22.6 J. It is noted that the particle contact is enhanced between char particles as well as the particles and cooling wall as the particle mixing time decreases. Consequently, heat transfer is augmented. 相似文献
33.
Edward J. Lillis Dexter Young 《Journal of the Air & Waste Management Association (1995)》2013,63(10):1015-1018
The various aspects of two similar but indeed different air pollution problems are discussed. Both fugitive emissions (industrial) and fugitive dust emissions represent problems affecting attainment of national standards. Both are difficult to quantify so as to determine the relative magnitude of the problem. Both have been generally overlooked in the past in relation to developing an effective and widespread air pollution control program. Both problems will generally require the use of non-conventional air pollution control measures. Both are also becoming the subject of more intensive investigation as more knowledge is being gathered to implicate such emissions as significant air pollution problems. 相似文献
34.
Junki Yun Ju Young Lee Jeehyeong Khim Won Hyun Ji 《Environmental monitoring and assessment》2013,185(8):6855-6865
The purpose of this study was to assess contaminated soil and groundwater for the urban redevelopment of a rapid transit railway and a new mega-shopping area. Contaminated soil and groundwater may interfere with the progress of this project, and residents and shoppers may be exposed to human health risks. The study area has been remediated after application of first remediation technologies. Of the entire area, several sites were still contaminated by waste materials and petroleum. For zinc (Zn) contamination, high Zn concentrations were detected because waste materials were disposed in the entire area. For petroleum contamination, high total petroleum hydrocarbon (TPH) and hydrocarbon degrading microbe concentrations were observed at the depth of 7 m because the underground petroleum storage tank had previously been located at this site. Correlation results suggest that TPH (soil) concentration is still related with TPH (groundwater) concentration. The relationship is taken into account in the Spearman coefficient (α). 相似文献
35.
Heesung Kim Young Jun Kim Quan Xie 《Journal of the Air & Waste Management Association (1995)》2013,63(12):1389-1398
Abstract Simultaneous removal of NH3 and H2S was investigated using two types of biofilters—one packed with wood chips and the other with granular activated carbon (GAC). Experimental tests and measurements included analyses of removal efficiency (RE), metabolic products, and results of long-term operation (around 240 days). The REs for NH3 and H2S were 92 and 99.9%, respectively, before deactivation. After deactivation, the RE for NH3 and H2S were decreased to 30–50% and 75%, respectively. The activity of nitrifying bacteria was inhibited by high concentrations of H2S (over 200 ppm) but recovered gradually after H2S addition was ceased. However, the Thiobacillus thioparus as sulfur oxidizing bacteria did not show inhibition at the NH3 concentration under 150-ppm conditions. The deactivation of the biofilter was caused by metabolic products [elemental sulfur and (NH4)2SO4] ac-cumulating on the packing materials during the extended operation. The removal capacities for NH3 and H2S were 6.0–8.0 and 45–75 mg N, S/L/hr, respectively. 相似文献
36.
Lee CS Lim YW Kim HH Yang JY Shin DC 《Environmental science and pollution research international》2012,19(5):1629-1639
Background, aim, and scope
The purpose of this study was to monitor and present the heavy metal concentrations in the blood of residents of areas near municipal waste incinerators (MWIs), who are more prone to environmental pollution. We also sought to compare and analyze the residents?? perception of environmental pollution as one of the factors affecting heavy metal concentrations in the blood using a survey about the perceived damage caused by the facilities. Since heavy metal levels in the blood can be affected not only by local environmental pollution but also by personal and occupational factors, heavy metal levels in the blood need to be verified and consistently monitored.Methods
Residents who live within 300?m of MWIs in Seoul are acknowledged to be under indirect influence according to the Waste Disposal Act. A survey was given to 841 residents living within 300?m of a MWI from 2006 to 2009. The concentrations of heavy metals (lead, cadmium, and mercury) in the blood were measured in the 841 surveyed residents and in 105 residents in reference areas. Additionally, the perception of the damage caused by municipal waste incinerators was investigated using scores from 1 to 5 on a Likert scale.Results
The measurements of the heavy metal concentrations in the blood showed that the mean concentrations of lead, cadmium, and mercury were 43.1, 1.7, and 1.3?ug/L, respectively. The blood levels of lead and cadmium were slightly higher in the group of the subjects who had resided the longest near the municipal waste incinerators. When compared with the domestic investigation by the Ministry of Environment, the concentrations of lead and cadmium were a little higher, while that of mercury was a little lower. Overall, there was no significant difference in the distribution of heavy metal levels in the blood among age groups. Additionally, the investigation of the perceived damage from municipal waste incinerators showed that the subjects 相似文献37.
Young Nam Chun Mun Sup Lim Kunio Yoshikawa 《Journal of Material Cycles and Waste Management》2012,14(1):65-73
A rotary drum dryer having an internal rotating body was designed and tested in this study. It was shown that the developed
dryer is effective for drying sewage sludge. The best operating conditions in the dryer were low energy input and almost 10%
moisture content. The conditions are 255°C for the rotary drum temperature, 17 min for the sludge residence time, and 55 kg/m3 h for the dryer load. Under these conditions, the drying efficiency was 84.8%. The average diameter of dried sludge was less
than 8 mm, and the weight reduction rate was 80%. Parametric screening studies achieved the following results. The drying
efficiency increased with the increase of the internal temperature and the sludge residence time in the rotary drum, while
the drying efficiency decreased when increasing the dryer load. In addition, it was shown that NH3 and CO2 were the primary components released from the sewage sludge drying process. The amounts of both of these components increased
when the rotary drum temperature was increased. 相似文献
38.
The possibility of using coal fly ash as a silica source for alkali borosilicate glass was investigated. Alkali borosilicate glasses were prepared from the coal fly ash mixed with 30 wt.% reagents composed of Na(2)O and B(2)O(3) by susceptor-induction heating. Their densities ranged from 2.24 to 2.55 g cm(-3) and decreased as the amount of B(2)O(3) addition increased. However, the Vickers microhardness showed a different tendency with the density since the glass network connectivity improved by boron anomaly, which was identified by a nuclear magnetic resonance analysis. The Vickers microhardness of the glass product, with the addition of 15 wt.% B(2)O(3) and 15 wt.% Na(2)O, was about 4030 MPa. Furthermore, the changes in microstructure were consistent with those in the chemical stability by the toxicity characteristic leaching procedure (TCLP). 相似文献
39.
40.
Data from surveys conducted by six separate recycling education programs funded under the Clean Michigan Fund are compared. The findings indicate that a strong pro-recycling attitude exists among the populations sampled with a significant percentage of respondents planning to increase their level of recycling in the future. To aid this increase in participation these data suggest that education efforts should focus on helping people become more familiar with the details of how to recycle. And finally, these data support the idea that efforts to promote waste reduction and recycling behavior should focus on non-monetary motives. 相似文献