全文获取类型
收费全文 | 70篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 1篇 |
废物处理 | 12篇 |
环保管理 | 1篇 |
综合类 | 7篇 |
基础理论 | 9篇 |
环境理论 | 1篇 |
污染及防治 | 25篇 |
评价与监测 | 3篇 |
社会与环境 | 12篇 |
出版年
2022年 | 2篇 |
2021年 | 1篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2016年 | 1篇 |
2014年 | 2篇 |
2013年 | 7篇 |
2012年 | 6篇 |
2011年 | 2篇 |
2010年 | 3篇 |
2009年 | 9篇 |
2008年 | 8篇 |
2007年 | 6篇 |
2006年 | 4篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 1篇 |
2001年 | 1篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1989年 | 1篇 |
1966年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有71条查询结果,搜索用时 15 毫秒
51.
Fallout (137)Cs and stable Cs in soils were separated with two extractants (1M CH(3)COONH(4) solution and 0.8M CH(3)COONH(4) in 5% HNO(3) solution after H(2)O(2) oxidization). The residue remaining after removal of the oxidizable organic-bound fraction was separated into the particle-size fractions including clay, silt, fine sand and coarse sand with a sieving and sedimentation method. Then, the concentrations of (137)Cs and stable Cs in the extracted fractions and the particle-size fractions were determined. The (137)Cs contents in the exchangeable and organic-bound fractions in the soil were approximately 10 and 20%, respectively. The (137)Cs content in the strongly bound fraction was about 70%, and the concentration of (137)Cs in the clay was the richest among the particle-size fractions. The specific activity of (137)Cs (concentration ratio of fallout (137)Cs/stable Cs) decreased in the order exchangeable, organic-bound and strongly bound fractions. The data suggest that equilibrium between (137)Cs and stable Cs was not reached among those fractions, even though most of the (137)Cs that had been deposited on the soil was derived from fallout weapons tests that occurred several decades ago. The concentration of (137)Cs among the particle-size fractions in each soil was different, whereas the specific activity of (137)Cs in the particle-size fractions had a relatively similar value. 相似文献
52.
Scenario analysis for reduction of pollutant load discharged from a watershed
by recycling of treated water for irrigation 总被引:1,自引:0,他引:1
Eisaku Shiratani Yoshiyuki Munakat Ikuo Yoshinag Tomijiro Kubot Koji Hama Tadayoshi Hitomi 《环境科学学报(英文版)》2010,22(6):878-884
A model in which a river model was layered on a distributed model (double-layered model) was developed to analyse the transport of water and pollutants (nitrogen,phosphorus,and BOD as organic matter) in watersheds and rivers.The model was applied to the watershed of Abragafuchi Lake,Japan,where serious water pollution has occurred over three decades,and the applicability of the model was demonstrated.Scenarios of recycling of sewage treated-water into agriculture to reduce pollutant load discharged into the lake were analysed.The results showed that irrigating paddy fields with the sewage-treated water could contribute to conserving water and reducing pollutant load,with reduction rate in BOD,nitrogen,and phosphorus ranging from 6%–36%,16%–46%,and 18%–51%,respectively.Particularly,the results indicated that,irrigating paddy fields with the treated water during non-cropping periods and the accompanying reduction in withdrawn water from the river were more effective in reducing pollutant loads discharged into the lake.Further study is required on the effect of recycled water on crop cultivation and soil conditions for safe implementation. 相似文献
53.
Masaki Takaoka Nobuo Takeda Takeshi Fujiwara Masato Kurata Tetsuo Kimura 《Journal of the Air & Waste Management Association (1995)》2013,63(8):931-940
Abstract The control of Hg emissions from a municipal solid waste incinerator (MSWI) is very important, because more than 78% of municipal solid waste (MSW) is incinerated. The Hg content of coal used in utility boilers is relatively low in Japan. In this study, recent trends in the Hg content of MSW in Japan and activated carbon (AC) injection as a control technology of Hg emission from an MSWI are discussed. The effect of AC injection on Hg removal from flue gas in an MSWI was investigated by pilot-scale experiments using a bag filter (BF). The injection of AC increases the Hg reduction ratio by 20–30% compared with cases without AC injection. The Hg reduction ratio increases as the flue gas temperature decreases. The Hg reduction ratio is closely related to the inlet Hg concentration and was expressed with a Langmuir-type adsorption isotherm. 相似文献
54.
Masaki Takaoka Nobuo Takeda Naruo Yamagata Takahiro Masuda 《Journal of Material Cycles and Waste Management》2011,13(3):198-205
We discuss the current status of waste to power generation (WPG) in Japan and various scenarios involving indirect reduction
of carbon dioxide emissions by WPG. The number of WPG facilities domestically as of 2005 was 286. Power generation capacity
attained 1,515 MW and power generation 7,050 GWh/year. This amount substitutes energy otherwise acquired from natural resources
such as fossil fuels in thermal power plants. If the basic unit of carbon dioxide is 0.555 kg-CO2/kWh, then the corresponding carbon dioxide emission reduction is calculated to be 3.9 million tons, equivalent to 26.7% of
the 14.6 million tons emitted by municipal solid waste incinerators (MSWI) in 2005. Using various existing technological options,
the power generation efficiency could reach more than 20% in MSWI facilities with capacity of 300 tons/day, although present
efficiency is only 12.0%. If about 85% of MSW were incinerated in MSWI with power generation efficiency of 20% as a feasible
assumption, the total power generation and the corresponding carbon dioxide reduction would be 16,540 GWh/year and 9.18 million
tons, respectively, equivalent to 62.7% of the carbon dioxide emitted by MSWI. Also, the ratio of the additional reduction
of carbon dioxide emissions by WPG to the total additional reduction (20,000 ktons/year) in Japan during the first commitment
period would be 26.3%, suggesting that promotion of WPG in MSWI is an effective option for prevention of global warming. 相似文献
55.
Takayoshi Yamaguchi Sonam Ngodup Mitsuhiro Nose Shinya Takeda 《Journal of Land Use Science》2016,11(4):401-416
Farmland abandonment has been a significant issue in mountain regions. Thus, many studies have attempted to uncover its driving factors. Most existing studies take a large- or meso-scale view of mountain regions, and there are a few studies that provide community-level analysis. Therefore, it is unclear how ecological and sociopolitical factors are actually combined to influence farmland abandonment at a community level. Thus, we conducted a field survey in the mountain village of Ladakh, northern India, beginning in 2009 and tried to understand the farmland abandonment occurrence process from the viewpoint of traditional altitudinal models of land use. Using data collected during the survey, a relationship between altitude and farmland abandonment was established. However, this relationship was complex, combining traditional forms of land use system in the village. The altitudinal model of land use was very common in mountain regions; thus, discussions of current land use issues should be based on an understanding of such traditional altitudinal systems. 相似文献
56.
Laboratory culture experiments were performed to study the changes in size-fractionated Fe concentrations during the growth
of the oceanic diatom Chaetoceros sp. Fe concentration was estimated for three size fractions: large labile particles (>0.2 μm), small colloidal particles
(0.2 μm to 200 kDa) and soluble species (<200 kDa). The size-fractionated Fe concentration in the nutrient-enriched filtered
seawater medium without diatom cells became stable within 4 d after the spike of FeCl3 solution. Light irradiation by white fluorescent tubes with a 14 h light:10 h dark cycle did not significantly alter concentrations
of the size-fractionated Fe. For the phytoplankton culture experiment, Fe-starved diatom cells were inoculated into the nutrient-enriched
media aged for 19 d after the addition of FeCl3. With the growth of diatom cells, total acid-labile Fe concentrations decreased from 0.60 to 0.46 nM during 7 d of incubation. However, only the concentration of the small colloidal particles showed a significant decrease;
the concentration of the other size fractions remained relatively constant. Although the media still contained sufficient
amounts Fe as large labile particles and soluble species, diatom cells appeared to be Fe-limited once Fe as small colloidal
particles had been used up. These results suggest that Fe in the small colloidal particle fraction was the most dynamic size
fraction during the growth of the diatom Chaetoceros sp. In addition, to better understand Fe dynamics in the ocean, we must consider the influence of phytoplankton growth on
small colloidal Fe [which is typically included in the dissolved Fe fraction (<0.2 μm)].
Received: 9 December 1999 / Accepted: 5 May 2000 相似文献
57.
Y. Kang R. Takeda A. Nada L. Thavarith S. Tang K. Nuki K. Sakurai 《Environmental monitoring and assessment》2014,186(9):5605-5616
In Cambodia, groundwater has been contaminated with arsenic, and purification of the water is an urgent issue. From 2010 to 2012, an international collaborative project between Japan and Cambodia for developing arsenic-removing technology from well water was conducted and supported by the foundation of New Energy and Industrial Technology Development Organization, Japan. Quality of well water was surveyed in Kandal, Prey Veng, and Kampong Cham Provinces, and a monitoring trial of the arsenic removal equipment using our patented amorphous iron (hydr)oxide adsorbent was performed. Of the 37 wells surveyed, arsenic concentration of 24 exceeded the Cambodian guideline value (50 μg L?1), and those of 27 exceeded the WHO guideline for drinking water (10 μg L?1). Levels of arsenic were extremely high in some wells (>1,000–6,000 μg L?1), suggesting that arsenic pollution of groundwater is serious in these areas. Based on the survey results, 16 arsenic removal equipments were installed in six schools, three temples, two health centers, four private houses, and one commune office. Over 10 months of monitoring, the average arsenic concentrations of the treated water were between 0 and 10 μg L?1 at four locations, 10–50 μg L?1 at eight locations, and >50 μg L?1 at four locations. The arsenic removal rate ranged in 83.1–99.7 %, with an average of 93.8 %, indicating that the arsenic removal equipment greatly lower the risk of arsenic exposure to the residents. Results of the field trial showed that As concentration of the treated water could be reduced to <10 µg L?1 by managing the As removal equipment properly, suggesting that the amorphous iron (hydr)oxide adsorbent has high adsorbing capacity for As not only in the laboratory environment but also in the field condition. This is one of the succeeding As removal techniques that could reduce As concentration of water below the WHO guideline value for As in situ. 相似文献
58.
Measures to prevent emissions of PCDDS/DFs and co-planar PCBs from crematories in Japan 总被引:1,自引:0,他引:1
In this study, PCDDs/DFs and co-planar PCBs concentrations in flue gases from 17 crematories and in fly ashes and bottom ashes (mainly bone) from several crematories were measured to grasp the present state of PCDDs/DFs emissions from crematories. The effects of several factors were discussed to prevent PCDDs/DFs emissions from crematories. Total concentration (normalized by 12% O2) of PCDDs/DFs was ranged from 4.9 to 1200 ng/m3 N, and toxic equivalent concentration was ranged from 0.064 to 24 ng TEQ/m3 N. As the results obtained in this research, the following measures to reduce PCDDs/DFs emission are recommended for existing crematories: (1) keeping the temperature at 800 degrees C in main/secondary chambers during a whole cremation, and (2) lowering the temperature in the dust collector. For newly installed crematories, following measures to prevent PCDDs/DFs emission including the measures for existing ones are recommended: (1) connecting one secondary chamber to one main chamber, (2) installing the high efficiency dust collector and reducing dust concentration to less than 0.01 g/m3 N, and (3) installing the sampling point for monitoring of PCDDs/DFs. 相似文献
59.
Identification and behavior of reaction products formed by chlorination of ethynylestradiol 总被引:4,自引:0,他引:4
Six products were formed by reaction of ethynylestradiol (EE2) with sodium hypochlorite in buffered solutions. 4-Chloroethynylestradiol (4-ClEE2) and 2,4-dichloroethynylestradiol (2,4-diClEE2) were identified as the two major reaction products, using preparative HPLC, MS, and NMR. When EE2 reacted with chlorine at different pHs (pH 5, 7, and 9) or chlorine concentrations (0.2, 1, 2, and 5 mmol/l, corresponding to molar ratios to EE2, 1, 5, 10, and 25, respectively), the formation of 4-ClEE2 and 2,4-diClEE2 was observed under the above conditions, and the highest yields were 20 and 52 mol%, respectively. EE2 was consumed almost completely within 5 min of chlorination by addition of chlorine of more than 1 mmol/l (molar ratio to EE2, 5). On the other hand, the two products existed in highly chlorinated solutions after 60 min (4ClEE2, 1-6 mol%; 2,4-diClEE2, 3-25 mol%). The estrogenic activities of 4-ClEE2 by estrogen receptor alpha or beta binding assay were similar to those of the parent EE2, and the activities of 2,4-diClEE2 were lower about 10 times. 相似文献
60.
Educational initiative of Osaka University in sustainability science: mobilizing science and technology towards sustainability 总被引:1,自引:1,他引:0
Michinori Uwasu Helmut Yabar Keishiro Hara Yoshiyuki Shimoda Tatsuyoshi Saijo 《Sustainability Science》2009,4(1):45-53
One of the most important and yet difficult challenges that modern societies face is how to mobilize science and technology
(S&T) to minimize the impact of human activities on the Earth’s life support systems. As the establishment of inter-disciplinary
education programs is necessary to design a unified vision towards understanding the complexity of human nature, the Research
Institute for Sustainability Science (RISS) launched a new program on sustainability science in April 2008. The program expects
to address the issue of how to use knowledge more effectively to understand the dynamic interactions between nature and human
society. This paper first offers an overview of international and Japanese initiatives on sustainability education in which
we highlight the uniqueness of the attempt by the Integrated Research System for Sustainability Science (IR3S). The paper
then introduces the RISS program for sustainability science, addressing the principles and curriculum design of the program.
The paper discusses the main problems and constraints faced when developing the program, such as institutional barriers in
building a curriculum and obtaining cooperation from faculty. To challenge these barriers and limitations, the RISS uses the
program as a platform to disseminate the idea of sustainability science across the university. This attempt helps us to obtain
the continuing cooperation necessary to improve and maintain the program.
相似文献
Michinori UwasuEmail: |