全文获取类型
收费全文 | 862篇 |
免费 | 63篇 |
国内免费 | 206篇 |
专业分类
安全科学 | 91篇 |
废物处理 | 50篇 |
环保管理 | 60篇 |
综合类 | 409篇 |
基础理论 | 140篇 |
污染及防治 | 278篇 |
评价与监测 | 45篇 |
社会与环境 | 37篇 |
灾害及防治 | 21篇 |
出版年
2023年 | 20篇 |
2022年 | 60篇 |
2021年 | 47篇 |
2020年 | 41篇 |
2019年 | 28篇 |
2018年 | 36篇 |
2017年 | 44篇 |
2016年 | 43篇 |
2015年 | 56篇 |
2014年 | 55篇 |
2013年 | 76篇 |
2012年 | 77篇 |
2011年 | 79篇 |
2010年 | 49篇 |
2009年 | 54篇 |
2008年 | 59篇 |
2007年 | 57篇 |
2006年 | 37篇 |
2005年 | 22篇 |
2004年 | 24篇 |
2003年 | 23篇 |
2002年 | 29篇 |
2001年 | 25篇 |
2000年 | 6篇 |
1999年 | 11篇 |
1998年 | 16篇 |
1997年 | 12篇 |
1996年 | 8篇 |
1995年 | 9篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 5篇 |
1989年 | 2篇 |
1988年 | 5篇 |
1987年 | 2篇 |
1984年 | 1篇 |
1982年 | 2篇 |
1973年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有1131条查询结果,搜索用时 15 毫秒
161.
Carbonaceous particles in the atmosphere and precipitation of the
Nam Co region, central Tibet 总被引:4,自引:1,他引:3
A continuous air and precipitation sampling for carbonaceous particles was conducted in a field observatory beside Nam Co, Central Tibetan Plateau during July of 2006 through January of 2007. Organic carbon (OC) was the dominant composition of the carbonaceous particles both in the atmosphere (1660 ng/m3) and precipitation (476 ng/g) in this area, while the average elemental carbon (BC) concentrations in the atmosphere and precipitation were only 82 ng/m3 and 8 ng/g, respectively. Very high OC/BC ratio suggested local secondary organic carbon could be a dominant contribution to OC over the Nam Co region, while BC could be mainly originated from Southern Asia, as indicated by trajectory analysis and aerosol optical depth. Comparison between the BC concentrations measured in Lhasa, those at “Nepal Climate Observatory at Pyramid (NCO-P)” site on the southern slope of the Himalayas, and Nam Co suggested BC in the Nam Co region reflected a background with weak anthropogenic disturbances and the emissions from Lhasa might have little impact on the atmospheric environment here, while the pollutants from the Indo-Gangetic Basin of Southern Asia could be transported to the Nam Co region by both the summer monsoon and the westerly. 相似文献
162.
在活动流场模型的基础上建立了新的溶质运移控制方程,研究了流场分形特征参数的计算方法;采用4组染色示踪试验资料,分析了活动流场模型模拟土壤水流运动和溶质运移宏观非均匀特征的适用性.模拟分析表明,活动流场模型能较准确地捕捉到土壤中的优先流特别是不稳定流的宏观运动特征;土壤存在大孔隙结构的情况下,水流和溶质将更快的迁移到深层土壤,活动流场模型模拟计算的入渗深度偏小,但大于连续性模型的模拟计算结果;当土壤中的大孔隙结构较少时,活动流场模型模拟预测的土壤含水率分布和溶质浓度分布与实测结果比较一致. 相似文献
163.
为研究杂散电流干扰影响范围及严重程度,通过现场测试典型深井和浅埋阳极地床地表电位梯度,探讨地表电位梯度分布规律,分析阳极地床杂散电流干扰特性。结果表明:深井阳极地床地表电位梯度沿阳极井中心辐射线方向先增大后减小,浅埋阳极地床地表电位梯度沿垂直于阳极体方向呈递减趋势;浅埋阳极地床地表电位梯度峰值和衰减速率均大于深井阳极,但强干扰平均影响半径仅为深井阳极的1/2;从强干扰影响半径看,应优先选用浅埋阳极地床;可通过适当增加井深、对干扰区内金属构筑物排流等方式,缓解深井阳极地床杂散电流干扰影响。研究结果可为强制电流阴极保护阳极地床选型和选址提供理论指导。 相似文献
164.
Min-Gu Lee Dongwoo Kang Hoyong Jo Jinwon Park 《Journal of Material Cycles and Waste Management》2016,18(3):407-412
In this study, we propose a process making calcium carbonate and calcium sulfate and recovering absorbent using ammonia absorbent, carbon dioxide, and industrial waste. The main objective of this study is to confirm the possibility of carbon capture and utilization based on waste materials. We assumed desulfurization gypsum and construction waste (ready mixed concrete washing water, waste concrete, etc.) are CaSO4, Ca(OH)2, respectively. And concentration of simulated carbon dioxide gas was 15 vol% similar to flue gas. Calcium carbonate was produced by combination reaction between ionic CO2 in absorbent and metal ion in the solid waste. Experiments were conducted at normal temperature and pressure. Furthermore, the generated products were characterized by X-ray diffraction, and scanning electron microscope. 相似文献
165.
Dongjin Lee Jisu Bae Jungu Kang Kiheon Kim 《Journal of Material Cycles and Waste Management》2016,18(3):445-454
This study was to find out potential of methane yield on food waste and food waste leachate as biomass in Korea. The seven biogasification facilities were selected for comparison of theoretical methane yield and actual methane yield. The theoretical methane yield was calculated based on organic constituents (carbohydrate, protein, fat) and based on element analysis. The actual methane yield was investigated based on volatile solids and CODcr. Theoretical methane yields by organic constituents were 0.52 Sm3CH4/kg VS and 0.35 Sm3CH4/kg CODcr and these by element analysis were 0.53 Sm3CH4/kg VS and 0.36 Sm3CH4/kg CODcr. Actual methane yields were 0.36 Sm3CH4/kg VSin and 0.26 Sm3CH4/kg CODcrin. Considering the average removal efficiency of organic materials of seven FWL biogasification facilities, actual methane yields were 0.48 Sm3CH4/kg VSrem and 0.33 Sm3CH4/kg CODcrrem. Methane yield by organic constituents is very similar to that by element analysis and actual methane yields of volatile solids and CODcr were similar to theoretical value. The actual methane yield in this study showed approximated boundary values with previous other references which conducted in lab-scale or biochemical methane potential (BMP) tests. In conclusion, Korean food waste and food waste leachate have sufficient potential of methane yield in the ongoing biogasification facilities. 相似文献
166.
167.
自从国家实施西部大开发战略以来,西部地区就不断探索工业化的发展道路,在工业化的有力带动下,西部的经济发展很快。但西部地区工业化现存发展模式严重依赖能源、资源,由于对生态资源毫无节制地开发和利用,环境污染和生态破坏严重。本文通过采用典型相关分析的方法对西部工业化与生态文明建设发展模式的相关性进行分析,探寻保障我国西部能源供应、实现经济可持续发展的重要战略,试图探索实现我国西部节能规划目标的节能服务产业。用博弈论的方法分析节能服务企业的机会主义行为对节能服务产业发展的不利影响,探寻节能服务模式在我国西部发展受阻的原因,并提出了促进节能服务产业发展的对策建议。实现西部工业化和生态文明协调发展,促进西部地区经济的和谐发展。 相似文献
168.
为了解溴氯海因的爆炸、氧化及腐蚀危险性,进行了克南试验、时间/压力试验、固体氧化性试验及腐蚀性试验。结果表明,溴氯海因只具有氧化性和腐蚀性,不具有爆炸性。 相似文献
169.
170.
吸声降噪设计中,在装修水平大致相当的前提下,能达到同一降噪标准的方案往往有多种,这些方案的造价不同,甚至会相差悬殊。因此从经济方面考虑,存在着方案的择忱问题。本文给出应用运筹学方法解决这一问题的数学模型及相应的计算程序,并给出了一个计算实例。 相似文献