全文获取类型
收费全文 | 74篇 |
免费 | 8篇 |
国内免费 | 20篇 |
专业分类
安全科学 | 16篇 |
废物处理 | 6篇 |
环保管理 | 3篇 |
综合类 | 56篇 |
基础理论 | 6篇 |
污染及防治 | 10篇 |
评价与监测 | 5篇 |
出版年
2022年 | 1篇 |
2020年 | 1篇 |
2019年 | 2篇 |
2016年 | 2篇 |
2015年 | 5篇 |
2014年 | 7篇 |
2013年 | 7篇 |
2012年 | 4篇 |
2011年 | 3篇 |
2010年 | 7篇 |
2009年 | 7篇 |
2008年 | 8篇 |
2007年 | 14篇 |
2006年 | 7篇 |
2005年 | 5篇 |
2004年 | 4篇 |
2003年 | 3篇 |
2002年 | 4篇 |
2001年 | 2篇 |
1999年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1989年 | 1篇 |
排序方式: 共有102条查询结果,搜索用时 31 毫秒
71.
本文结合工程实例,详细介绍了汽车工厂涂装车间的火灾自动报警及联动控制系统的设计原则和做法,力求以最通俗易懂的语言,将自己积累的经验总结出来和大家共同探讨. 相似文献
72.
73.
日本石川岛播磨重工业公司最近宣布,公司已开发成功将PE、PP等废旧塑料转化为石化原料的工艺。利用这项技术可将废PE、PP塑料制品用催化剂将其裂解为苯、甲苯、二甲苯的混合物和氢。 相似文献
74.
二甲苯胺是重要的化工原料,在其生产过程中每生产1kg二甲苯胺,约产生1.7kg废酸,2.2kg硝苦物洗涤废水,0.3kg加氢还原水,70g残渣等。经试验表明,用产品起以废酸,可使废酸中硝基物浓度从107降至20mg/L,并可回收大部分废酸供利用,硝化废水和还原废水各进行二级萃取后,硝基物和二甲苯胺去除率均在90%以上,废渣用焚烧法处理,各项指标均达标排放。 相似文献
75.
<正> 随着工业的迅速发展,有机废气污染日益严重,特别是电工厂排出大量含苯、酚的刺激性气体,恶化着厂区周围环境。电工产品和绝缘材料在生产过程中有机溶剂挥发或蒸发进入大气,吸入会引起头晕、头痛、失眠、流泪、恶心、呕吐、食欲不振、全身无力,重者肝肾遭到损害,昏迷失去知觉,神经麻木,呼吸道和结膜发炎。我国环境标准对工厂排放有机废气未作限量规定,对居住区大气中有机物质最高容许浓度作了规定,如 相似文献
76.
77.
Levels of synthetic musk fragrances in human milk from three cities in the
Yangtze River Delta in Eastern China 总被引:2,自引:0,他引:2
Xiaolan Zhang Gaofeng Liang Xiangying Zeng Jing Zhou Guoying Sheng Jiamo Fu 《环境科学学报(英文版)》2011,23(6):983-990
Synthetic musks are used as additives in many household products. After absorption into the human body, they accumulate and
their concentrations in human milk reflect both the mother and her infant’s exposure level. Concentrations of four synthetic musks,
musk xylene (1-tert-butyl-2,6-dimethyl-2,4,6-trinitrobenzene, MX), musk ketone (4-tert-butyl-2,6-dimethyl-3,5-dinitroacetophenone,
MK), 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8-hexamethylcyclopenta[
]-2-benzopyran (HHCB) and 7-acetyl-1,1,3,4,4,6-hexamethyl-1,2,3,4-
tetrahydronaphthalene (AHTN), were determined in human milk samples collected from Shanghai, Wuxi, and Shaoxing in Eastern
China. The four synthetic musks were found in most samples analyzed, with HHCB the dominant component followed by MX. The
median (mean) values for HHCB, AHTN, MX and MK concentrations were 63 (82), 5 (12), 17 (24) and 4 (9) ng/g lipid weight,
respectively. These data suggested the total synthetic musk contamination was low, and the distribution percentage was HHCB > MX
> AHTN MK. The relative high ratio of nitro to polycylic musk indicated that nitro musks were still widely used. The musk
concentrations in these cities were not significantly different from each other (p > 0.05). Principal components score plots were
obtained, which showed similar exposure sources. The amount of total synthetic musks in human milk were not associated with
mother’s age, although HHCB was significantly correlated with AHTN (p < 0.05). Daily ingestion of HHCB, AHTN, MX and MK for
infants from human milk were estimated as (2526 2926), (370 524), (7391 832), and (277 462) ng/day, respectively. Those
doses were 1–2 orders of magnitude below the provisional tolerable daily intakes. 相似文献
78.
In situ adsorption-catalysis system for the removal of o-xylene over an
activated carbon supported Pd catalyst 总被引:1,自引:1,他引:0
An activated carbon (AC) supported Pd catalyst was used to develop a highly efficient in situ adsorption-catalysis system for the removal of low concentrations of o-xylene. In this study, three kinds of Pd/AC catalysts were prepared and tested to investigate the synergistic efficiency between adsorption and catalysis for o-xylene removal. The Pd/AC catalyst was first used as an adsorbent to concentrate dilute o-xylene at low temperature. After saturated adsorption, the adsorbed o-xylene was oxidized to CO2 and H2O by raising the temperature of the catalyst bed. The results showed that more than 99% of the adsorbed o-xylene was completely oxidized to CO2 over a 5% Pd/AC catalyst at 140℃. Brunauer-Emmett-Teller (BET) analysis, scanning electron microscopy (SEM), temperature-programmed desorption (TPD), and temperature-programmed oxidation (TPO) were applied to investigate the physical properties of o-xylene adsorption-desorption and the in situ adsorption-catalysis activity of the AC support and Pd/AC catalyst. A synergistic relationship between the AC support and the active Pd species for the removal of low concentrations of o-xylene was established. 相似文献
79.
炼焦过程中单环芳烃排放及源特征 总被引:4,自引:1,他引:3
通过不锈钢采样罐采样和液氮预浓缩/气相色谱/质谱系统分析,研究我国山西某地的土法炼焦和机械炼焦生产过程中单环芳烃(MAHs)的排放情况.炼焦过程MAHs以苯、甲苯、(间+对)-二甲苯为主要成分,苯和总MAHs浓度在土法炼焦烟气中最高达3421.0μg/m3和4865.9μg/m3,在机械炼焦无组织排放气体和烟气中分别为548.7μg/m3、1054.8μg/m3和1376.4μg/m3、1819.4μg/m3.焦炭生产过程中MAHs浓度变化显著:土法炼焦过程MAHs前期释放浓度高于后期;机械炼焦无组织排放MAHs在装煤和出焦时明显升高;而机械炼焦烟气中则是装煤时最高,出焦时最低.苯、甲苯、乙苯和二甲苯(BTEX)散点图和相关性分析显示机械炼焦释放MAHs主要来自煤的高温分解,而土法炼焦中MAHs释放则可能除焦煤不完全燃烧释放外还受别的因素影响.苯/甲苯/乙苯/二甲苯比值(B/T/E/X)特别是苯/乙苯(B/E)值显示炼焦释放的MAHs具有不同于其它来源的特征. 相似文献
80.