全文获取类型
收费全文 | 144篇 |
免费 | 0篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 1篇 |
废物处理 | 9篇 |
环保管理 | 24篇 |
综合类 | 17篇 |
基础理论 | 30篇 |
污染及防治 | 50篇 |
评价与监测 | 13篇 |
社会与环境 | 3篇 |
出版年
2023年 | 2篇 |
2022年 | 6篇 |
2021年 | 5篇 |
2020年 | 4篇 |
2019年 | 3篇 |
2018年 | 4篇 |
2017年 | 6篇 |
2016年 | 4篇 |
2015年 | 4篇 |
2014年 | 4篇 |
2013年 | 17篇 |
2012年 | 7篇 |
2011年 | 7篇 |
2010年 | 9篇 |
2009年 | 2篇 |
2008年 | 4篇 |
2007年 | 7篇 |
2006年 | 5篇 |
2005年 | 8篇 |
2004年 | 3篇 |
2003年 | 3篇 |
2002年 | 4篇 |
2001年 | 1篇 |
2000年 | 3篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1978年 | 2篇 |
1975年 | 2篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1971年 | 2篇 |
1968年 | 1篇 |
排序方式: 共有147条查询结果,搜索用时 31 毫秒
81.
82.
Shaswati Saha Rohan Gupta Shradhanjali Sethi Rima Biswas 《Frontiers of Environmental Science & Engineering》2022,16(8):101
83.
The potential use of laccase (SP-504) in an advanced oxidation-based treatment technology to remove 2,4-dimethylphenol (DMP) from water was investigated with and without the additive, polyethylene glycol (PEG). The DMP concentration was varied between 1.0 and 5.0 mM. The optimization of pH and enzyme concentration in the presence and absence of PEG was carried out. All experiments were carried out in continuously stirred reactors for 3h at room temperature. The reaction was initiated by adding enzyme to the reaction mixture. For more than 95% removal of DMP, the presence of PEG reduced the inactivation of enzyme so that the required enzyme concentrations were reduced by about 2-fold compared to the same reactions in the absence of PEG. Finally, the PEG concentrations were optimized to obtain the minimum dose required. For higher substrate concentrations, the availability of oxygen was insufficient in achieving 95% or more removal. Therefore, the effect of increasing dissolved oxygen at higher substrate concentration was investigated. The laccase studied was capable of efficiently removing DMP at very low enzyme concentrations and hence shows great potential for cost-effective industrial applications. 相似文献
84.
85.
Scrubbers are used as particulate emission control devices with the increase in stringency of old regulations or promulgation of new regulations. Scrubbing of fly ash in a novel dual flow scrubber, i.e., one water filled bubble section and one section with water-spray, is reported in this article. The presented system included a tapered section in order to achieve the bubble regime. On the other hand, a two-phase critical flow atomizer was used for the generation of spray regime with high degree of spray uniformity. Experiments were carried out for studying the behavior of the system in terms of various pertinent variables. The fly ash removal mechanism was explained in terms of various physical interactions. Electrostatic effect was found to have an insignificant influence on the collection efficiency of fly ash. The removal efficiency was found to decrease with the increase in inlet fly ash loading in the bubble section while it was increased in the spray section. A compromise must, therefore, be struck while operating the scrubber for achieving the desired performance. The effects of other operating variables studied on the removal efficiency remained similar in the regimes under investigation. The combined effect was, however, that the spray regime was dominating. Experimentation also revealed that the bubble section collected particles down to 20 microm size. Detailed experimentation revealed that almost 100% removal efficiency (zero penetration) of fly ash could be achieved in the dual flow scrubber at a QL/QG ratio of 3.0 m3/1000 ACM (actual cubic meter). Almost zero penetration of fly ash particles, clearly demonstrated that the dual flow scrubber with its staging operations met with the stricter emission regulations for particulate matter. Selection of any particulate control device is intrinsically related to the performance as a function of various pertinent variables of the system. Correlations were, therefore, put forward for the prediction of the performances of the bubble and the spray sections in terms of various pertinent variables of the system. The overall removal efficiency achievable in the dual flow scrubber was predicted with the help of these correlations. The predicted values were in excellent agreement with the experimental values (well within +/-5.0% deviation). Comparison of the performance of the present system with the existing systems indicated that the bubble and spray sections either alone or in combination (as in a dual flow scrubber), was energy and efficiency-wise much better than the existing systems. The novelty of the system is also described. 相似文献
86.
87.
Seiichirou Ohura Hiroyuki Harada Biplob Kumar Biswas Mitsunori Kondo Susumu Ishikawa Hidetaka Kawakita Keisuke Ohto Katsutoshi Inoue 《Journal of Material Cycles and Waste Management》2011,13(4):293-297
Zirconium was loaded onto orange waste, a cheap and available agricultural waste in Japan, to investigate the feasibility
of its utilization for phosphorus recovery from secondary effluent and side-stream liquid, which contain 5.9 and 68.2 mg/dm3 phosphorus, respectively. The phosphorus removal from side-stream liquid by using zirconium-loaded saponified orange waste
(Zr-SOW) gel increased with an increasing solid/liquid ratio, and it was found that Zr-SOW gel showed better performance than
zirconium ferrite. The prepared adsorbent was effective for phosphorus removal and exhibited a reasonably high adsorption
capacity, twice than that of zirconium ferrite. The secondary effluent was treated in a column packed with Zr-SOW gel, and
an dynamic adsorption capacity of 1.3 mol-P/kg was attained. The adsorbed phosphorus from the column was successfully eluted
as a concentrated form by using a small amount of 0.2 M NaOH. Throughout the elution process, zirconium was not leaked from
the adsorption gel. 相似文献
88.
Toshiaki Hayashi Tai Gyu Lee Melynda Hazelwood Elizabeth Hedrick Pratim Biswas 《Journal of the Air & Waste Management Association (1995)》2013,63(6):922-929
ABSTRACT The use of activated carbon fiber (ACF) filters for the capture of particulate matter and elemental Hg is demonstrated. The pressure drop and particle collection efficiency characteristics of the ACF filters were established at two different face velocities and for two different aerosols: spherical NaCl and combustion-generated silica particles. The clean ACF filter specific resistance was 153 kg m-2 sec-1. The experimental specific resistance for cake filtration was 1.6 × 106 sec-1 and 2.4 × 105 sec-1 for 0.5- and 1.5-μm mass median diameter particles, respectively. The resistance factor R was approximately 2, similar to that for the high-efficiency particulate air filters. There was a discrepancy in the measured particle collection efficiencies and those predicted by theory. The use of the ACF filter for elemental Hg capture was illustrated, and the breakthrough characteristic was established. The capacity of the ACF filter for Hg capture was similar to other powdered activated carbons. 相似文献
89.
90.
Angsumita Pramanick Abhiram Kanneganti Jing Lin Jeslyn Wong Sarah Weiling Li Pooja Sharma Dimri Aniza Puteri Mahyuddin Sailesh Kumar Sebastian Enrique Illanes Jerry Kok Yen Chan Lin Lin Su Arijit Biswas Paul Anantharajah Tambyah Ruby Yun-Ju Huang Citra Nurfarah Zaini Mattar Mahesh Choolani 《黑龙江环境通报》2021,41(8):1018-1035
There are over 50 SARS-CoV-2 candidate vaccines undergoing Phase II and III clinical trials. Several vaccines have been approved by regulatory authorities and rolled out for use in different countries. Due to concerns of potential teratogenicity or adverse effect on maternal physiology, pregnancy has been a specific exclusion criterion for most vaccine trials with only two trials not excluding pregnant women. Thus, other than limited animal studies, gradually emerging development and reproductive toxicity data, and observational data from vaccine registries, there is a paucity of reliable information to guide recommendations for the safe vaccination of pregnant women. Pregnancy is a risk factor for severe COVID-19, especially in women with comorbidities, resulting in increased rates of preterm birth and maternal morbidity. We discuss the major SARS-CoV-2 vaccines, their mechanisms of action, efficacy, safety profile and possible benefits to the maternal-fetal dyad to create a rational approach towards maternal vaccination while anticipating and mitigating vaccine-related complications. Pregnant women with high exposure risks or co-morbidities predisposing to severe COVID-19 infection should be prioritised for vaccination. Those with risk factors for adverse effects should be counselled accordingly. It is essential to support patient autonomy by shared decision-making involving a risk-benefit discussion with the pregnant woman. 相似文献