全文获取类型
收费全文 | 251篇 |
免费 | 1篇 |
国内免费 | 10篇 |
专业分类
安全科学 | 12篇 |
废物处理 | 46篇 |
环保管理 | 11篇 |
综合类 | 40篇 |
基础理论 | 34篇 |
污染及防治 | 94篇 |
评价与监测 | 8篇 |
社会与环境 | 16篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 2篇 |
2022年 | 5篇 |
2021年 | 5篇 |
2020年 | 1篇 |
2019年 | 3篇 |
2018年 | 6篇 |
2017年 | 5篇 |
2016年 | 8篇 |
2015年 | 5篇 |
2014年 | 3篇 |
2013年 | 19篇 |
2012年 | 10篇 |
2011年 | 15篇 |
2010年 | 17篇 |
2009年 | 18篇 |
2008年 | 21篇 |
2007年 | 24篇 |
2006年 | 13篇 |
2005年 | 9篇 |
2004年 | 19篇 |
2003年 | 7篇 |
2002年 | 14篇 |
2001年 | 5篇 |
2000年 | 4篇 |
1999年 | 3篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1989年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1979年 | 2篇 |
1977年 | 2篇 |
1969年 | 1篇 |
1957年 | 1篇 |
1956年 | 1篇 |
排序方式: 共有262条查询结果,搜索用时 78 毫秒
71.
72.
73.
Xin-Rui Li Hiroshi Koseki 《Journal of Loss Prevention in the Process Industries》2005,18(4-6):455-459
In this paper, compared with a UN cylindrical 500 mL Dewar (H.4 in the UN tests), a spherical 1 L Dewar vessel was used to study the early stages of runaway reactions of several liquid and solid samples, including three organic peroxides and a reactive material. The samples were filled in the vessels and the temperature profiles versus times at different positions of the samples were measured. As a result, the minimum temperatures, defined as the SADT, were averagely 10 K lower than those measured in the cylindrical Dewar vessels. At the same time, the temperature profiles of solids in the spherical Dewars tended to be homogeneous. The heat transfer coefficient of a spherical Dewar is only 0.18 W/K/m, one-eighth of a conventional cylindrical Dewar vessel. Meanwhile it has a low phi factor. These factors are essential to simulate low heat loss bulk conditions in the equilibrium process and at the early stage of a runaway reaction. To characterize the ability of the adiabaticity of a storage vessel, it can be seen that a spherical Dewar could simulate the plant process having critical storage size of a reactive-material, r0, approximately 0.6 m. It is recommended that such a technique is used to investigate the SADT of an unstable material in larger scale packaging or a material with very weak heat release in industry. 相似文献
74.
由于日本消防法中固体氧化物的燃烧试验方法,与联合国黄皮书中所建议的试验方法有所不同,在实际应用中经常出现矛盾.因此,本文对其中的一些不同之处进行了重新的研究考察.并与日本海事检定协会和代表联合国标准测试方法的荷兰应用科学研究组织进行合作,对比研究了联合国建议的关于固体氧化物燃烧试验的方法.并就其中发现的问题提出了相应的改进意见.具体有以下4方面的措施:(1)纤维素种类对于燃烧时间的影响;(2)环境湿度及纤维素含水量对燃烧时间的影响;(3)导火线材料与导火线破裂方式出现的问题;(4)联合国建议中的举例数据. 相似文献
75.
A new method utilizing phase separation phenomena for the extraction of heavy metal ions used as colorants in colored glass is proposed. Colored soda-lime-silica glass containing Co or Cr as a colorant was remelted with B2O3 to yield soda-lime-borosilicate glass. The soda-lime-borosilicate glass thus obtained was leached in 1M nitric acid at 90 degrees C to dissolve the borate phase. All cations (Na, Ca, Cr and Co) concentrated in the borate phase are successfully leached out with the dissolution of the borate phase, when the amount of the B2O3 added to the glass and heat treatment conditions are properly chosen. Porous silicate glass powders with high SiO2 purity are obtained as the result of the leaching. Porous glass can also be formed as bulk material by controlling the composition of additives during the remelting. 相似文献
76.
77.
The air temperature distributions in August (summer) and December (winter) were measured in an approximately 15 × 15-km urban
area in Hyogo Prefecture, Japan, in order to study the spatial distribution of the air temperature and to propose effective
measures against the heat island phenomenon. The air temperature was measured mainly by using thermometer shelters installed
in an elementary school and a junior high school. The characteristic air temperature distribution depended on the season.
The air temperature was higher inland than in the coastal region in August but was higher in the coastal region in December.
The air temperature index indicated that the area where higher air temperatures would most likely appear was 5 to 10 km inland
from the coast in August and around the coast in December. The seasonal air temperature distribution was presumably due to
the strength of solar radiation and anthropogenic exhaust heat. 相似文献
78.
N-Nitrosodimethylamine (NDMA) is a potent carcinogen that yields a cancer risk of 10−6 at concentrations as low as 0.7 ng L−1. Tentative guideline values are set at 3 ng L−1 in California, USA; 9 ng L−1 in Ontario, Canada; 40 ng L−1 nationwide in Canada; and 100 ng L−1 by the World Health Organization. NDMA is a great concern in treating reclaimed water as well as drinking water. UV degradation can be considered effective degradation method. A 1-log reduction of NDMA is achieved by 1000 mJ cm−2 of a 254-nm low pressure (LP) mercury UV lamp. However, a higher degradation efficiency than that provided by LP lamps is desired in practical treatment. In this study, the effects of wavelength and water quality were investigated to achieve higher degradation efficiency. The effects of wavelength were examined by comparing three UV lamps: a 222-nm Kr Cl Excimer UV lamp, a 254-nm LP mercury UV lamp, and a 230- to 270-nm filtered medium pressure (FMP) mercury UV lamp. The 222-nm lamp and FMP lamp achieved 4 times and 2.8 times higher degradation efficiency, respectively, than the conventional 254-nm LP lamp. Effects on water quality were also simulated by using absorption spectrum data of nitrate solutions and process water from a drinking-water treatment plant. In the simulation, the 222-nm lamp was affected by UV-absorbing compounds in the water, whereas the FMP lamp showed more stable degradation efficiency. Appropriate use of these three types of lamps could enhance the efficiency of degradation of NDMA. 相似文献
79.
80.
Kazuhiro Okabe Hiroshi Mano Yuichi Fujioka 《International Journal of Greenhouse Gas Control》2008,2(4):485
A novel process for carbon dioxide (CO2) separation, which was named a membrane flash process, was developed to realize an energy-saving technology and to substitute it for a conventional regenerator. The electric energy for CO2 recovery in a membrane flash process using aluminum oxide and diethanolamine was lower than the thermal energy of the conventional chemical absorption process. Flashing at elevated temperature by the low temperature energy significantly reduced the electric energy and required much less membrane area. This process has potentiality of low cost capture of CO2 when the low temperature energy, which is not available for other purposes, can be utilized to elevate flashing temperature. 相似文献