全文获取类型
收费全文 | 130篇 |
免费 | 2篇 |
国内免费 | 4篇 |
专业分类
安全科学 | 3篇 |
废物处理 | 6篇 |
环保管理 | 11篇 |
综合类 | 20篇 |
基础理论 | 12篇 |
污染及防治 | 60篇 |
评价与监测 | 18篇 |
社会与环境 | 4篇 |
灾害及防治 | 2篇 |
出版年
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 2篇 |
2019年 | 1篇 |
2018年 | 3篇 |
2017年 | 1篇 |
2016年 | 2篇 |
2015年 | 2篇 |
2014年 | 2篇 |
2013年 | 14篇 |
2012年 | 8篇 |
2011年 | 6篇 |
2010年 | 7篇 |
2009年 | 6篇 |
2008年 | 1篇 |
2007年 | 10篇 |
2006年 | 10篇 |
2005年 | 8篇 |
2004年 | 7篇 |
2003年 | 4篇 |
2002年 | 2篇 |
2001年 | 6篇 |
2000年 | 7篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 9篇 |
1996年 | 1篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有136条查询结果,搜索用时 250 毫秒
11.
12.
13.
14.
Zhisheng Zhang Guenter Engling Chuan-Yao Lin Charles C.-K. Chou Shih-Chun C. Lung Shih-Yu Chang Shaojia Fan Chuen-Yu Chan Yuan-Hang Zhang 《Atmospheric environment (Oxford, England : 1994)》2010,44(26):3187-3195
Intensive measurements of aerosol (PM10) and associated water-soluble ionic and carbonaceous species were conducted in Guangzhou, a mega city of China, during summer 2006. Elevated levels of most chemical species were observed especially at nighttime during two episodes, characterized by dramatic build-up of the biomass burning tracers levoglucosan and non-sea-salt potassium, when the prevailing wind direction had changed due to two approaching tropical cyclones. High-resolution air mass back trajectories based on the MM5 model revealed that air masses with high concentrations of levoglucosan (43–473 ng m?3) and non-sea-salt potassium (0.83–3.2 μg m?3) had passed over rural regions of the Pearl River Delta and Guangdong Province, where agricultural activities and field burning of crop residues are common practices. The relative contributions of biomass burning smoke to organic carbon in PM10 were estimated from levoglucosan data to be on average 7.0 and 14% at daytime and nighttime, respectively, with maxima of 9.7 and 32% during the episodic transport events, indicating that biomass and biofuel burning activities in the rural parts of the Pearl River Delta and neighboring regions could have a significant impact on ambient urban aerosol levels. 相似文献
15.
For this study, field measurements of current profiles, buoy trajectories and the lag of two tidal stations were performed to explore the flow characteristics of Taichung Harbour. in order to distinguish the effects of wind drift current on circulation inside Taichung Harbour, field surveys during both summer and monsoon (winter) season were completed separately. the speed of the drift current was about 3.5% that of the, wind speed, based on the field data. the horizontal dispersion coefficients were close to Bowden's (1965) formula for the tidal current. the water temperature showed a two-layer profile, with the mixing thickness about 4 to 6 metres for the upper layer. the corresponding Richardson number was about 70. the tidal lag between the two tidal stations was 9.68 minutes. All the results agree well with the theoretical results. 相似文献
16.
17.
Phylogeographic structure of false clownfish, Amphiprion ocellaris, explained by sea level changes on the Sunda shelf 总被引:3,自引:0,他引:3
The phylogenetic structure of the anemonefish Amphiprion ocellaris was established based on sequence data generated for the 5′ end of the cytochrome b (cytb) gene at 11 sites throughout Southeast Asia. Considerable genetic structuring was observed throughout the range of
A. ocellaris. The region has a complex geography, with the Sunda shelf having been exposed during the lower sea levels associated with
periods of glaciation. The direction of subsequent flooding of the Sunda shelf, as a direct consequence of the retreating
glacial sheets, can be predicted based on the major river drainage systems in the region. Much of the phylogeographic structure,
including levels of intra-site genetic variation, can be explained in terms of the “seeding” of sites on the Sunda shelf,
by those on the shelf rim, as sea levels rose. We often found surface ocean currents in the region, which should influence
larval dispersal, to be poorly correlated with phylogeographic structure. Several geographically close sites, which appear
to be connected by surface currents, showed significant genetic stratification. We hypothesise that the phylogeographic structure
of A. ocellaris is more reminiscent of the Pleistocene sea level changes than surface currents. The high contribution of sea level changes
to the phylogeographic structure was also supported by several missing haplotypes in the generated spanning network. Cytb
DNA sequences generated for recently recruited A. ocellaris individuals sampled from Singapore indicate that, on a local scale, there is a directional inflow of recruits, which is dependent
on the monsoon seasons. The nature of dispersal and genetic structure of reef fish species found on the Sunda shelf is clearly
complex, and should take into consideration past phylogeographic events.
Received: 13 November 1999 / Accepted: 12 July 2000 相似文献
18.
Ming-Shean Chou Shu-Ling Lu 《Journal of the Air & Waste Management Association (1995)》2013,63(8):711-720
ABSTRACT This paper presents results obtained from a performance study on the biotreatment of 1,3-butadiene in an air stream using a reactor that consisted of a two-stage, in-series biotrickling filter connected with a three-stage, in-series biofilter. Slags and pig manure-based media were used as packing materials for the biotrickling filter and the biofilter, respectively. Experimental results indicated that, for the biotrickling filter portion, the butadiene elimination capacities were below 5 g/m3/hr for loadings of less than 25 g/m3/hr, and the butadiene removal efficiency was only around 17%. For the biofilter portion, the elimination capacities ranged from 10 to 107 g/m3/hr for loadings of less than 148 g/m3/hr. The average butadiene removal efficiency was 75–84% for superficial gas velocities of 53–142 m/hr and a loading range of 10–120 g/m3/hr. The elimination capacity approached a maximum of 108 g/m3/hr for a loading of 150 g/m3/hr. The elimination rates of butadiene in both the biotrickling filter and biofilter were mass-transfer controlled for influent butadiene concentrations below about 600 ppm for superficial gas velocities of 29–142 m/hr. The elimination capacity was significantly higher in the biofilter than in the biotrickling filter. This discrepancy may be attributed to the higher mass-transfer coefficient and gas-solid interfacial area offered for transferring the gaseous butadiene in the biofilter. 相似文献
19.
Guor-Cheng Fang Shin-Jay Lin Shih-Yu Chang Charles-C.K. Chou 《Atmospheric environment (Oxford, England : 1994)》2009,43(38):6039-6048
Previous studies have suggested that the ongoing global climate change will likely increase the intensity and frequency of extreme weather, such as typhoons. Since the beginning of global warming, it has become necessary to understand the influence of typhoons on air quality. Rare data, especially particulate measurements data could be used to establish the relationship between the air pollution and typhoons. One of main limiting factors is that most of the previous chemical analyses of particulates used a relatively long sampling time, which could dilute the temporal impact of particulate characteristics and their sources. This work, depending more time-resolved measurements, focus on the characteristics and sources of high particulate matter levels and the influence of typhoons and the Pacific high system. Depending on the measurements, two pollutant groups were clearly identified in this work. The first pollutant group was the emissions from neighboring riverbeds under the strong circulation of the typhoon in the driest season and characterized as high coarse particle concentrations with high mass fraction of Ca2+. The second pollutant group was characterized as the formation and transport of secondary particles with prevalent ions of NH4+, NO3?, and SO42? and occurred in the sea-land breeze circulation under the influence the Pacific high system. 相似文献
20.
The present paper describes an effort for developing the total maximum daily load (TMDL) for phosphorus and a load reduction
strategy for the Feitsui Reservoir in Northern Taiwan. BASINS model was employed to estimate watershed pollutant loads from
nonpoint sources (NPS) in the Feitsui Reservoir watershed. The BASINS model was calibrated using field data collected during
a 2-year sampling period and then used to compute watershed pollutant loadings into the Feitsui Reservoir. The simulated results
indicate that the average annual total phosphorus (TP) loading into the reservoir is 18,910 kg/year, which consists of non-point
source loading of 16,003 kg/year, and point source loading of 2,907 kg/year. The Vollenweider mass balance model was used
next to determine the degree of eutrophication under current pollutant loading and the load reduction needed to keep the reservoir
from being eutrophic. It was estimated that Feitsui Reservoir can becoming of the oligotrophic state if the average annual
TP loading is reduced by 37% or more. The results provide the basis on which an integrated control action plan for both point
and nonpoint sources of pollution in the watershed can be developed. 相似文献