全文获取类型
收费全文 | 109篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
废物处理 | 23篇 |
环保管理 | 4篇 |
综合类 | 13篇 |
基础理论 | 17篇 |
污染及防治 | 35篇 |
评价与监测 | 4篇 |
社会与环境 | 11篇 |
灾害及防治 | 3篇 |
出版年
2023年 | 1篇 |
2022年 | 3篇 |
2021年 | 3篇 |
2018年 | 1篇 |
2017年 | 2篇 |
2016年 | 2篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 10篇 |
2012年 | 2篇 |
2011年 | 4篇 |
2010年 | 6篇 |
2009年 | 8篇 |
2008年 | 6篇 |
2007年 | 6篇 |
2006年 | 6篇 |
2005年 | 6篇 |
2004年 | 6篇 |
2003年 | 2篇 |
2002年 | 6篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1997年 | 3篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1990年 | 3篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 3篇 |
1978年 | 3篇 |
1970年 | 2篇 |
1961年 | 1篇 |
排序方式: 共有110条查询结果,搜索用时 187 毫秒
61.
Fumiaki Kitahara Nobuya Mizoue Shigejiro Yoshida 《Environmental monitoring and assessment》2009,159(1-4):331-340
We evaluated the quality of data being collected for the Japanese National Forest Inventory (NFI). The inventory program commenced in 1999 but has not incorporated a quality assurance (QA) program; we sought to determine what effect this was having on the quality of data being collected. Forty-eight plots in four prefectures were measured by operational field teams and then remeasured by a control team that made careful and unhurried measurements. The paired data were evaluated, including diameter, total height, tree count, species richness, and topographic condition. Compared to the control team, all field teams of each prefecture tended to significantly underestimate all of the continuous variables. Most variables had larger variability in the inventory data than has been reported in the published literature. The findings of consistent bias and large variation in the field team measurements call for urgent implementation of a quality assurance program (extensive field training and regular remeasurement) in the Japanese NFI to improve data quality, and this conclusion could be applied to the inventory system of any country that does not include a QA program. 相似文献
62.
Takeshi Itakura Kazumasa Hirata Masanori Aoki Ryo Sasai Hisao Yoshida Hideaki Itoh 《Environmental Chemistry Letters》2009,7(4):343-345
We demonstrated a complete decomposition method for ionic liquids (ILs; organic cation part: butyl-methyl or ethyl-methyl
imidazolium, and inorganic anion part: PF6 −, BF4
− or Br−) in aqueous media by combining a hydrothermal mineralization method with a photocatalytic decomposition (PD) method. As a
result, the hydrothermal treatment with Ca(OH)2 mineralizer could effectively remove the inorganic anion part, such as PF6
− or BF4
− and the PD could decompose the organic cation part effectively. Therefore, the detoxification of ILs in aqueous media was
accomplished by the present method. 相似文献
63.
Takeki Maeda Juzo Matsuda Hiroshi Nakashima Koichi Yoshida Joji Suzuki 《Journal of Material Cycles and Waste Management》2000,2(2):143-149
Over a period of 21 months, we composted food refuse from a student restaurant in Hokkaido University using a commercially
available composting machine. The machine had two reactors, each with a working volume of 250 l. The refuse was mixed with
sawdust in a ratio of 5 l sawdust to 10 kg refuse, and this mixture was fed into the machine daily. We studied the characteristics
of the refuse, the composting mixture, and the finished compost in an effort to optimize the operating parameters. We also
evaluated the effectiveness of the composting process by determining the decomposition rates of the composting materials.
The optimum moisture content of the composting mixture was between 30% wet basis (wb) and 40% wb in this machine. The composting
machine worked well when the first reactor was filled with composting mixture and 0.5 kg lime was added once per week. The
mass of the materials supplied was reduced by 84% over the study period. The decomposition rate of the volatile matter in
all composting materials was 66%. The mass of the food refuse supplied was 14.8 kg/day on average, and the moisture content
of the refuse was 77% wb on average.
Received: October 4, 1999 / Accepted: April 4, 2000 相似文献
64.
M. Katsuyama H. Shibata T. Yoshioka T. Yoshida A. Ogawa N. Ohte 《Sustainability Science》2009,4(2):179-188
We simulated hydrological and biogeochemical responses to logging in a forested watershed to determine the vulnerability and/or
resiliency of the forest ecosystems in the Lake Shumarinai Basin in northern Hokkaido, Japan. We used a biogeochemical model
(PnET-CN) and a rainfall–runoff model (HYCYMODEL) to predict ecosystem responses. The PnET-CN model simulated well the observed
NO3
− concentrations in streamwater, particularly at high concentrations during snowmelt; however, the model could not simulate
small increases in NO3
− during the summer. By considering hydrological processes within the watershed and combining the model with the HYCYMODEL
(PnET + HYCYMODEL), the seasonality of streamwater NO3
− concentrations was better simulated. Using these models, the long-term effects of logging were simulated for coniferous,
deciduous, and mixed forests. NO3
− concentrations in streamwater increased in response to the logging disturbance in both coniferous and deciduous forests.
In the coniferous forest, NO3
− concentrations reached a maximum 10 years after logging, and high concentrations persisted for 30 years. In contrast, NO3
− concentrations in the deciduous forest reached a maximum within 3–4 years and recovered to pre-disturbance levels after 15 years.
We also used the models to determine the effects of different sizes and types (coniferous, deciduous, and mixed forest) of
logging areas on Lake Shumarinai. The model results indicated that large areas of cutting require more than 100 years for
complete lake recovery. Whereas the annual discharge to the lake minimally increased, the annual NO3
− load greatly increased. Our simulation results elucidate the vulnerability and resiliency of forest ecosystems and provide
valuable information for ecosystem management. 相似文献
65.
Shin-ichi Sakai Hideto Yoshida Jiro Hiratsuka Carlo Vandecasteele Regina Kohlmeyer Vera Susanne Rotter Fabrizio Passarini Alessandro Santini Maria Peeler Jinhui Li Gil-Jong Oh Ngo Kim Chi Lawin Bastian Stephen Moore Natsuko Kajiwara Hidetaka Takigami Takaaki Itai Shin Takahashi Shinsuke Tanabe Keijiro Tomoda Takashi Hirakawa Yasuhiro Hirai Misuzu Asari Junya Yano 《Journal of Material Cycles and Waste Management》2014,16(1):1-20
End-of-life vehicles (ELV) have become a global concern as automobiles have become popular worldwide. An international workshop was held to gather data and to discuss 3R policies and ELV recycling systems, their background and present situation, outcomes of related policies and programs, the framework of recycling and waste management, and case studies on related topics in several countries and regions, as well as the essential points of the comparison. Legislative ELV recycling systems are established in the EU, Japan, Korea, and China, while in the US, ELV recycling is managed under existing laws on environmental protection. Since automobile shredding residue (ASR) has a high calorific value and ash content, and includes heavy metals as well as a mass of unclassified fine particles, recycling ASR is considered highly difficult. Countries with a legislative ELV system commonly set a target for recovery rates, with many aiming for more than 95 % recovery. In order to reach this target, higher efficiency in ASR recovery is needed, in addition to material recycling of collectable components and metals. Environmentally friendly design was considered necessary at the planning and manufacturing stages, and the development of recycling systems and techniques in line with these changes are required for sound ELV management. 相似文献
66.
67.
R. Grover L. A. Kerr K. Wallace K. Yoshida J. Maybank 《Journal of environmental science and health. Part. B》2013,48(4):331-347
Abstract Residues of 2,4‐D (2,4‐dichlorophenoxyacetic acid) in air samples from several sampling sites in central and southern Saskatchewan during the spraying seasons in the 1966–68 and 1970–75 periods were determined by gas‐liquid Chromatographic techniques. Initially, individual esters of 2,4‐D were characterized by retention times and confirmed further by co‐injection and dual column procedures. Since 1973, however, only total 2,4‐D acid levels in air samples have been determined after esterification to the methyl ester and confirmed by gc/ms techniques whenever possible. Up to 50% of the daily samples collected during the spraying season at any of the locations and during any given year contained 2,4‐D, with butyl esters being found most frequently. The daily 24‐hr mean atmospheric concentrations of 2,4‐D ranged from 0.01 to 1.22 μg/m3, 0.01 to 13.50 μg/m3, and 0.05 to 0.59 μg/m for the iso‐propyl, mixed butyl and iso‐octyl esters, respectively. Even when the samples were analysed for the total 2,4‐D content, i.e. from 1973 onwards, the maximum level of the total acid reached only 23.14 μg/m. In any given year and at any of the sampling sites, about 30% of the samples contained less than 0.01 μg/m3 of 2,4‐D. In another 40% of the samples, the levels of 2,4‐D ranged from 0.01 to 0.099 yg/m. Only about 30% of the samples contained 2,4‐D concentrations higher than 0.1 μg/m3, with only 10% or less exceeding 1 μg/m3. None of the samples, obtained with the high volume particu‐late sampler, showed any detectable levels of 2,4‐D, indicating little or no transport of 2,4‐D adsorbed on dust particles or as crystals of amine salts. 相似文献
68.
Hirofumi Aizawa Hideto Yoshida Shin-ichi Sakai 《Resources, Conservation and Recycling》2008,52(12):1399-1410
The Japanese system of recycling home electrical appliances has several unique aspects, including (1) a limited number of target appliances, (2) a recycling fee system that requires consumers to pay a recycling fee at the time of disposal, and (3) a direct recycling obligation for manufacturers, who have a physical, rather than a financial, responsibility for their end-of-life products. We studied data from 2001 to 2007 and found that the amount of four specified home electrical appliances and their materials that was recycled increased from about 319,249 tonnes in 2001 to about 447,262 tonnes—or 3.5 kg per inhabitant—in 2006. Recycling yield and development of recycling technologies have also improved. New recycling technologies have enabled a higher rate of material recycling of plastics (i.e., a closed-loop recycling). Improved eco-design, such as design for easier disassembly, has been promoted, and the higher quality of discarded appliances has enhanced the reuse market. Hazardous substances and fluorocarbons are being well managed. Problems with the recycling system include inelastic recycling fees, illegal dumping, illegal transfer by retailers, and the limited number of target appliances. Recycling fees could be reduced; this move might reduce the incidence of illegal dumping, as would engage stakeholders in collaborative efforts against illegal dumping. Illegal transfers could be reduced by improved traceability for retailers. Products such as liquid crystal displays, plasma display panels and clothes dryers have become increasingly common and should be also be targeted for recycling. 相似文献
69.
mRNA expression of a cadmium-responsive gene is a sensitive biomarker of cadmium exposure in the soil collembolan Folsomia candida 总被引:1,自引:0,他引:1
Taizo Nakamori Akira Fujimori Tadaaki Ban-nai Satoshi Yoshida 《Environmental pollution (Barking, Essex : 1987)》2010,158(5):1689-1695
The gene expression of environmental organisms is useful as a biomarker of environmental pollution. One of its advantages is high sensitivity. We identified the cDNA of a novel cadmium-responsive gene in the soil collembolan Folsomia candida. The deduced protein, designated “metallothionein-like motif containing protein” (MTC), was cysteine-rich and contained a metallothionein-like motif with similarity to metallothionein, but had a much longer sequence than metallothionein and contained repeated sequences of amino acids. Expression of MTC mRNA was sensitively induced by cadmium exposure at 0.3 mg/kg of dry food, a concentration at which toxic effects are not observed, but expression was not affected by γ-ray exposure (an inducer of oxidative stress). These findings suggest that MTC is involved in cadmium-binding processes rather than in oxidative-stress responses. In conclusion, we suggest that gene expression of MTC may be a candidate biomarker for detecting low levels of cadmium contamination in soil. 相似文献
70.
Transport and transformation of sulfur compounds over East Asia during the TRACE-P and ACE-Asia campaigns 总被引:4,自引:0,他引:4
Meigen Zhang Itsushi Uno Yasuhiro Yoshida Yongfu Xu Zifa Wang Hajime Akimoto Timothy Bates Trish Quinn Alan Bandy Byron Blomquist 《Atmospheric environment (Oxford, England : 1994)》2004,38(40):6947
On the basis of the recently estimated emission inventory for East Asia with a resolution of 1×1°, the transport and chemical transformation of sulfur compounds over East Asia during the period of 22 February through 4 May 2001 was investigated by using the Models-3 Community Multi-scale Air Quality (CMAQ) modeling system with meteorological fields calculated by the regional atmospheric modeling system (RAMS). For evaluating the model performance simulated concentrations of sulfur dioxide (SO2) and aerosol sulfate (SO42−) were compared with the observations on the ground level at four remote sites in Japan and on board aircraft and vessel during the transport and chemical evolution over the Pacific and Asian Pacific regional aerosol characterization experiment field campaigns, and it was found that the model reproduces many of the important features in the observations, including horizontal and vertical gradients. The SO2 and SO42− concentrations show pronounced variations in time and space, with SO2 and SO42− behaving differently due to the interplay of chemical conversion, removal and transport processes. Analysis of model results shows that emission was the dominant term in regulating the SO2 spatial distribution, while conversion of SO2 to SO42− in the gas phase and the aqueous phase and wet removal were the primary factors that controlled SO42− amounts. The gas phase and the aqueous phase have the same importance in oxidizing SO2, and about 42% sulfur compounds (25% in SO2) emitted in the model domain was transported out, while about 57% (35% by wet removal processes) was deposited in the domain during the study period. 相似文献