全文获取类型
收费全文 | 107篇 |
免费 | 0篇 |
国内免费 | 3篇 |
专业分类
安全科学 | 3篇 |
废物处理 | 15篇 |
环保管理 | 11篇 |
综合类 | 13篇 |
基础理论 | 28篇 |
污染及防治 | 27篇 |
评价与监测 | 10篇 |
社会与环境 | 2篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 1篇 |
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 2篇 |
2018年 | 1篇 |
2017年 | 3篇 |
2016年 | 3篇 |
2015年 | 1篇 |
2014年 | 3篇 |
2013年 | 7篇 |
2012年 | 10篇 |
2011年 | 6篇 |
2010年 | 2篇 |
2009年 | 10篇 |
2008年 | 7篇 |
2007年 | 7篇 |
2006年 | 4篇 |
2005年 | 4篇 |
2004年 | 5篇 |
2003年 | 6篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1985年 | 1篇 |
1981年 | 1篇 |
1971年 | 1篇 |
排序方式: 共有110条查询结果,搜索用时 0 毫秒
71.
Noriyoshi Kakuta Atsushi Shimizu Hironobu Ohkita Takanori Mizushima 《Journal of Material Cycles and Waste Management》2009,11(1):23-26
The dehydrochlorination behavior of plasticizer (DOP) and inorganic filler (CaCO3) contained in PVC samples and the properties of the activated carbons produced from those carbon residues have been investigated.
In the dehydrochlorination process, both additives contributed not only to a decrease in HCl yield but also to the prolonged
evolution of HCl. Part of the Cl species were observed to be stabilized as CaCl2 by reaction with calcium ions when CaCO3 was added. More than 80% of chlorine removal was achieved in all samples at 533 K. The use of potassium as an activation
agent led to the production of activated carbon with a specific surface area greater than 1000 m2/g at the low temperature of 1023 K and assisted also in the elimination of residual Cl species by the formation of KCl during
activation.
Chemical Feedstock Recycling & Other Innovative Recycling Techniques 6 相似文献
72.
Distributions of serotonin and catecholamines in larvae of the marine bryozoan Bugula neritina (Bryozoa: Cheilostomatida) were investigated using immunohistochemistry with anti-serotonin antiserum and glyoxylic acid–induced
fluorescence histochemistry. Anti-serotonin immunoreactive substances and glyoxylic acid–induced fluorescent substances had
similar distributions in the equatorial neuromuscular ring, the neural plexus, the paired axial neuromuscular cords, and tracts
connecting the neural plexus to ciliated cells bordering the pyriform organ. The effects of dopamine, noradrenaline, adrenaline,
tyramine, octopamine, synephrine and serotonin, at 10−4, 10−5 and 10−6
M, on settlement were analysed. In filtered seawater, 98% of larvae settled in 3 h, but only 11%, 3% and 6% total settlement
was observed after 8 h in 10−4
M dopamine, 10−4
M serotonin and 10−5
M serotonin, respectively. Total settlement was 70% in 10−4
M noradrenaline, 80% in 10−4
M adrenaline and 60% in 10−4
M tyramine. Less than 60% settlement was observed in 10−4 and 10−5
M octopamine and synephrine. Serotonin's inhibitory effect on settlement was mimicked by a range of serotonin receptor agonists
and antagonists, among which 5-carboxamidotryptamine was the most potent.
Received: 19 March 1999 / Accepted: 11 October 1999 相似文献
73.
Laboratory experiments were conducted to differentiate between factors controlling the hatching success of copepod eggs. Factors that could affect viability of eggs; viz food quality, female condition and external factors were investigated. In a series of experiments the copepod Acartia tonsa Dana was fed several different diets while egg production and hatching success were monitored. The diet was analysed for fatty acid content as an indicator of food quality. Both egg production and hatching were found to be affected by the nutritional quality of the food. Hatching was also highly dependent on female fertility. External effects were tested by exposing eggs to diatom extracts. Negative effects were only evident at high extract concentrations, but disappeared when aeration was supplied to the solution. Oxygen measurements showed that failure to hatch was due to hypoxia in the extracts. No inhibitory or toxic effects of diatom cell components on hatching could be found. 相似文献
74.
Combined toxicity of copper and phenol derivatives to Daphnia magna: effect of complexation reaction 总被引:2,自引:0,他引:2
The complexation of Cu with phenol was investigated in aqueous solution to find the changes in toxicity toward Daphnia magna in mixtures of copper and phenol derivatives and determine an appropriate prediction model for the toxicity of these mixtures. In the titration experiment, the results showed that phenol played an important role in the remarkable reduction of the Cu(2+) concentration, due to its complexation with Cu, with the subsequent reduction in the toxicity of aqueous mixtures containing both Cu and phenol. As a result, it was clearly demonstrated that Cu-phenol formed a non-toxic complex toward D. magna as the mortality declined, despite the addition of phenol to a fixed Cu concentration. Meanwhile, prediction of the combined toxicity for binary mixtures of Cu and 11 phenol derivatives more accurately followed an independent action model (p = 0.143, df = 124, and t = -1.475 in t-test) than an effect summation model (p approximately 0, df = 134, and t = 7.528 in t-test) due to the dissimilar modes of action and the complexation reactions between Cu and each of the phenolic compounds. Consequently, this study supports the importance of considering complexation reactions in assessing the combined toxicity for the formulation of water quality in mixtures of heavy metals and organic compounds, and in these cases, an independent action model was found to be appropriate. 相似文献
75.
Ki Young Park Jae Woo Lee Kyu-Hong Ahn Sung Kyu Maeng Jong Hyuk Hwang Kyung-Guen Song 《Water environment research》2004,76(2):162-167
A pilot-scale facility integrated with an ozonation unit was built to investigate the feasibility of using ozone-disintegration byproducts of wasted biomass as a carbon source for denitrification. Ozonation of biomass resulted in mass reduction by mineralization as well as by ozone-disintegrated biosolids recycling. Approximately 50% of wasted solids were recovered as available organic matter (ozonolysate), which included nonsettleable microparticles and soluble fractions. Microparticles were observed in abundance at relatively low levels of ozone doses, while soluble fractions became dominant at higher levels of ozone doses in ozone-disintegrated organics. Batch denitrification experiments showed that the ozonolysate could be used as a carbon source with a maximum denitrification rate of 3.66 mg nitrogen (N)/g volatile suspended solids (VSS) x h. Ozonolysate was also proven to enhance total nitrogen removal efficiency in the pilot-scale treatment facility. An optimal chemical oxygen demand (COD)-to-nitrogen ratio for complete denitrification was estimated as 5.13 g COD/g N. The nitrogen-removal performance of the modified intermittently decanted extended aeration process dependent on an external carbon supply could be described as a function of solids retention time. 相似文献
76.
Osamu Abe Wenshou Wei Masao Mikami Kenji Kosugi Junrong Xu Takeshi Sato Mingzhe Liu Masujiro Shimizu Atsushi Sato 《Water, Air, & Soil Pollution: Focus》2005,5(3-6):3-13
Four automatic weather stations (AWS) were installed on the slopes and foot areas of the Tianshan and Kunlun Mountains along
a longitude of 80 degrees east: (1) Taglak 2400 m a.s.l., (2) Aksu 1000 m, (3) Kartash 2800 m, and (4) Qira 1700 m. These
two slopes face the Taklimakan Desert. Tagliak lies on the southern slope of Tianshan, and Kartash on the northern slope of
Kunlun. The meteorological characteristics of the mountainous regions were investigated using surface data obtained during
an intensive observation period (IOP) in spring 2002. It was found that visibility on the slopes decreases in the daytime,
and there is no relationship between visibility and wind speed in the mountainous areas. Two snow layers containing dust particles
were observed in the snow cover in Taglak during the IOP in spring 2003. These results suggest that a warm air parcel containing
aeolian dust climbs over the slopes of the mountainous areas, and dust particles in the mountainous areas are transported
from the foot areas. 相似文献
77.
Stone GS Henderson AK Davis SI Lewin M Shimizu I Krishnamurthy R Bisgard K Lee R Jumaan A Marziale E Bryant M Williams C Mason K Sirois M Hori M Chapman J Bowman DJ 《Disasters》2012,36(2):270-290
The 2005 hurricane season caused extensive damage and induced a mass migration of approximately 1.1 million people from southern Louisiana in the United States. Current and accurate estimates of population size and demographics and an assessment of the critical needs for public services were required to guide recovery efforts. Since forecasts using pre-hurricane data may produce inaccurate estimates of the post-hurricane population, a household survey in 18 hurricane-affected parishes was conducted to provide timely and credible information on the size of these populations, their demographics and their condition. This paper describes the methods used, the challenges encountered, and the key factors for successful implementation. This post-disaster survey was unique because it identified the needs of the people in the affected parishes and quantified the number of people with these needs. Consequently, this survey established new population and health indicator baselines that otherwise would have not been available to guide the relief and recovery efforts in southern Louisiana. 相似文献
78.
Aikawa M Hiraki T Tamaki M Kasahara M Kondo A Uno I Mukai H Shimizu A Murano K 《Environmental monitoring and assessment》2006,122(1-3):61-79
An intensive field survey, with 6-h measurement intervals, of concentrations of chemical species in particulate matter and gaseous compounds was carried out at coastal sites on the Sea of Japan during winter. The concentration variation of SO2(g) and HNO3(g) were well correlated, whereas the NH3(g) concentration variation had no correlation with those of SO2(g) and HNO3(g). The NH4
+ (p)/non-sea-salt- (nss-)SO4
2 −(p) ratio in particulate matter was mainly affected by the location of the sampling site. One or more concentration peaks of nss-Ca2 + for survey period were observed. Backward trajectories analyses for the highest nss-Ca2 + concentration peaks showed some inconsistency in pathways. We consider that insufficient mixing of the atmosphere and/or insufficient time for the transported air pollutants to react with those discharged locally are the most likely explanations for the discrepancies between the measured products [HNO3][NH3] and the calculated values. 相似文献
79.
Factors dominating stratification cycle and seasonal water quality variation in a Korean estuarine reservoir 总被引:4,自引:0,他引:4
Lee YG Kang JH Ki SJ Cha SM Cho KH Lee YS Park Y Lee SW Kim JH 《Journal of environmental monitoring : JEM》2010,12(5):1072-1081
A comprehensive monitoring program was conducted during 2005-2007 to investigate seasonal variations of hydrologic stability and water quality in the Yeongsan Reservoir (YSR), located at the downstream end of the Yeongsan River, Korea. A principal component analysis (PCA) was performed to identify factors dominating the seasonal water quality variation from a large suite of measured data--11 physico-chemical parameters from 48 sampling sites. The results showed that three principal components explained approximately 62% of spatio-seasonal water quality variation, which are related to stratifications, pollutant loadings and resultant eutrophication, and the advective mixing process during the episodic rainfall-runoff events. A comparison was then made between YSR and an upstream freshwater reservoir (Damyang Reservoir, DYR) in the same river basin during an autumn season. It was found that the saline stratification and pollutant input from the upstream contributed to greater concentrations of nutrients and organic matter in YSR compared to DYR. In YSR, saline stratification in combination with thermal stratification was a dominant cause of the longer period (for two consecutive seasons) of hypoxic conditions at the reservoir bottom. The results presented here will help better understand the season- and geography-dependent characteristics of reservoir water quality in Asian Monsoon climate regions such as Korea. 相似文献
80.
Study of harmful algal blooms in a eutrophic pond, Bangladesh 总被引:2,自引:0,他引:2
Roksana Jahan Saleha Khan Md. Mahfuzul Haque Joong Ki Choi 《Environmental monitoring and assessment》2010,170(1-4):7-21
The purpose of this research was to analyze the underlying mechanisms and contributing factors related to the seasonal dynamic of harmful algal blooms in a shallow eutrophic pond, Bangladesh during September 2005–July 2006. Two conspicuous events were noted simultaneously throughout the study period: high concentration of phosphate–phosphorus (>3.03; SD 1.29 mg l???1) and permanent cyanobacterial blooms {>3,981.88 × 103 cells l???1 (SD 508.73)}. Cyanobacterial blooms were characterized by three abundance phases, each of which was associated with different ecological processes. High nitrate–nitrogen (>2.35; SD 0.83 mg l???1), for example, was associated with high cyanobacterial abundance, while low nitrate–nitrogen (0.36; SD 0.2 mg l???1) was recorded during moderate abundance phase. Extremely low NO3–N/PO4–P ratio (>3.55, SD 2.31) was recorded, and all blooming taxa were negatively correlated with this ratio. Cyanobacterial blooms were positively correlated with temperature (r?=?0.345) and pH (0.833; p?=?0.05) and negatively correlated with transparency (r?=???0.956; p?=?0.01). Although Anabaena showed similar relationship with water quality parameters as cyanobacteria, the co-dominant Microcystis exhibited negative relationship with temperature (r?=???0.386) and nitrate–nitrogen (r?=???0.172). This was attributed to excessive growth of Anabaena that suppressed Microcystis’s growth. Planktothrix was the third most dominant taxa, while Euglena was regarded as opportunistic. 相似文献