全文获取类型
收费全文 | 106篇 |
免费 | 0篇 |
国内免费 | 6篇 |
专业分类
安全科学 | 3篇 |
废物处理 | 28篇 |
环保管理 | 3篇 |
综合类 | 20篇 |
基础理论 | 22篇 |
污染及防治 | 27篇 |
评价与监测 | 6篇 |
社会与环境 | 3篇 |
出版年
2023年 | 2篇 |
2022年 | 2篇 |
2019年 | 2篇 |
2018年 | 6篇 |
2017年 | 4篇 |
2016年 | 5篇 |
2015年 | 5篇 |
2014年 | 7篇 |
2013年 | 8篇 |
2012年 | 3篇 |
2011年 | 7篇 |
2010年 | 4篇 |
2009年 | 11篇 |
2008年 | 7篇 |
2007年 | 6篇 |
2006年 | 9篇 |
2005年 | 7篇 |
2004年 | 8篇 |
2003年 | 2篇 |
2001年 | 3篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1993年 | 1篇 |
1982年 | 1篇 |
排序方式: 共有112条查询结果,搜索用时 446 毫秒
41.
Aya Yoshida Atsushi Terazono Toshiya Aramaki Keisuke Hanaki 《Journal of Material Cycles and Waste Management》2005,7(1):8-15
China has been the largest importer of secondary materials for recycling from Japan during the past decade. In this study, we analyzed the transfer of major secondary materials (plastic, steel, copper, and aluminum scrap) from Japan to China. We identified specific destinations for secondary materials, and the characteristics of secondary materials transferred to China. The major destination for the transfer of secondary materials to China is Guangdong province and part of the Huadong area (Shanghai, Zhejiang, and Jiangsu). Most scrap metal imported into China is of low quality. The destinations of most high-quality nonferrous scrap, imported as processed goods on consignment or through the transit improvement trade, are the northeast border provinces, especially Xinjiang Uighur province. The coefficients of specialization for Chinese cities were different from those for the provinces. Guangdong shows an average recycling structure for China. The structure gradually changes from south to north. 相似文献
42.
Shinsuke Murakami Atsushi Terazono Naoya Abe Yuichi Moriguchi Hideki Miyakawa 《Journal of Material Cycles and Waste Management》2006,8(1):46-55
In Japan, the Law for the Recycling of Specified Kinds of Home Appliances came into effect in April 2001. This law aims to
introduce appropriate waste treatment and promote the efficient use of resources so that we can achieve a sound material-cycle
society. The law introduces a new framework for recycling that places obligations principally on the manufacturers and retailers
of home appliances. Material flow analysis of this new framework is essential for evaluation of the system and for finding
any problems that may exist. We therefore analyzed the material flows in facilities that recycle electrical home appliances.
The mass balances in the recycling facilities were appropriately estimated. Then the potential destinations were surveyed
and analyzed, even though the legal framework does not include flows after the recycling facilities. The potential destination
after the facilities varies and depends on both the economy and the related regulations. Currently, considerable amounts of
recovered materials are exported and recycled. However, the sustainability of these trades is unknown. Therefore, we should
keep a close eye on the situation and make sure that our recycling system is adaptable to meet any future changes. 相似文献
43.
We have succeeded in converting waste polystyrene from electrical appliances into a polymer flocculant for treating some kinds
of wastewater after chemical modification. Waste polystyrene, such as polystyrene foam and additive-containing TV cabinets,
was converted into a water-soluble polymer, polystyrene sulfate (PSS), and PSS of various degrees of aqueous viscosity was
obtained by introducing sulfone bridges during sulfonation. We examined the relationship between the degree of flocculation
of wastewater and the aqueous viscosity of the PSS, and found that PSS with medium viscosity is most suitable for flocculating
inorganic wastewater from a factory, and PSS with high viscosity is most suitable for dewatering organic domestic wastewater.
We report how PSS containing sulfone bridges works as a polymer flocculant for treating wastewater.
Received: July 19, 2000 / Accepted: September 21, 2000 相似文献
44.
Promoting sustainable forest management as part of the reduced emissions from deforestation and degradation in developing countries (REDD)-plus mechanism in the Copenhagen Accord of December 2009 implies that tropical forests will no longer be ignored in the new climate change agreement. As new financial incentives are pledged, costs and revenues on a 1-ha tract of tropical forestland being managed or cleared for other land use options need to be assessed so that appropriate compensation measures can be proposed. Cambodia's highly stocked evergreen forest, which has experienced rapid degradation and deforestation, will be the first priority forest to be managed if financial incentives through a carbon payment scheme are available. By analyzing forest inventory data, we assessed the revenues and costs for managing a hypothetical 1 ha of forestland against six land use options: business-as-usual timber harvesting (BAU-timber), forest management under the REDD-plus mechanism, forest-to-teak plantation, forest-to-acacia plantation, forest-to-rubber plantation, and forest-to-oil palm plantation. We determined annual equivalent values for each option, and the BAU-timber and REDD-plus management options were the highest, with both options influenced by logging costs and timber price. Financial incentives should be provided at a level that would allow continuation of sustainable logging and be attractive to REDD-plus project developers. 相似文献
45.
For direct gas to liquid (GTL),a novel process producing energy sources for methane dehydroaromatization is needed.Supporting MoO3 on H-MFI zeolite shows the high catalytic capacity and a selective activity for dehydroaromatization of methane to benzene at 973 K in a fixed bed reactor.On the other hand,deactivation by coke on the active sites in all the catalysts is formed during the reaction.H2 co-feed suppressed the deactivation,which is probably due to the decrease in coking amount.Mo K-edge X-ray absorption fine structure (XAFS) results showed the formation of dispersed Mo2C species with low crystallinity after dehydroaromatization.Mo L-edge XANES (X-ray absorption near-edge structure) indicated the formation of active Mo species including Mo2C and Mo-oxycarbide (MoOxCy),where the red-ox state should be independent in the absence/presence of H2.It is concluded that Mo-oxycarbide species act as highly active species,and their stability affected the durable activity in the presence of H2. 相似文献
46.
The effectiveness of gibbsite (GB), an amorphous aluminum oxide, for the recovery of Mo(VI) from eluates of fly ash of two coal-fired thermal power stations and of roof tile waste was investigated. Upon the qualitative analysis of an eluate of fly ash, 16 elements were detected. Greater amounts of these elements were eluted under acidic conditions (pH 2) than from the neutral or basic eluate of fly ash. GB was used for the adsorption of Mo(VI). Equilibrium adsorption was reached within 1?min. Optimal solution acidity for the adsorption of Mo(VI) onto GB400 (calcined at 400°C) was pH 2. The main adsorption mechanism was ion exchange with a number of hydroxyl groups of GB400. For repeated ad- and desorption of Mo(VI), GB400 could be used at least four times and the recovery percentage of Mo(VI) with sodium hydroxide solution as eluent surpassed 90%. Our results showed that GB400 was very effective for the recovery of Mo(VI) from fly ash. 相似文献
47.
Tomohiro Kuwae Jota Kanda Atsushi Kubo Fumiyuki Nakajima Hiroshi Ogawa Akio Sohma Masahiro Suzumura 《Ambio》2016,45(3):290-301
Estuarine
and shallow coastal systems (ESCS) are recognized as not only significant organic carbon reservoirs but also emitters of CO2 to the atmosphere through air–sea CO2 gas exchange, thus posing a dilemma on ESCS’s role in climate change mitigation measures. However, some studies have shown that coastal waters take up atmospheric CO2 (Catm), although the magnitude and determinants remain unclear. We argue that the phenomenon of net uptake of Catm by ESCS is not unusual under a given set of terrestrial inputs and geophysical conditions. We assessed the key properties of systems that show the net Catm uptake and found that they are often characteristic of human-dominated systems: (1) input of high terrestrial nutrients, (2) input of treated wastewater in which labile carbon is highly removed, and (3) presence of hypoxia. We propose that human-dominated ESCS are worthy of investigation as a contributor to climate change mitigation. 相似文献
48.
Xie L Xie P Ozawa K Honma T Yokoyama A Park HD 《Environmental pollution (Barking, Essex : 1987)》2004,127(3):431-439
A sub-chronic toxicity experiment was conducted to examine tissue distribution and depuration of two microcystins (microcystin-LR and microcystin -RR) in the phytoplanktivorous filter-feeding silver carp during a course of 80 days. Two large tanks (A, B) were used, and in Tank A, the fish were fed naturally with fresh Microcystis viridis cells (collected from a eutrophic pond) throughout the experiment, while in Tank B, the food of the fish were M. viridis cells for the first 40 days and then changed to artificial carp feed. High Performance Liquid Chromatography (HPLC) was used to measure MC-LR and MC-RR in the M. viridis cells, the seston, and the intestine, blood, liver and muscle tissue of silver carp at an interval of 20 days. MC-RR and MC-LR in the collected Microcystis cells varied between 268-580 and 110-292 microg g(-1) DW, respectively. In Tank A, MC-RR and MC-LR varied between 41.5-99.5 and 6.9-15.8 microg g(-1) DW in the seston, respectively. The maximum MC-RR in the blood, liver and muscle of the fish was 49.7, 17.8 and 1.77 microg g(-1) DW, respectively. No MC-LR was detectable in the muscle and blood samples of the silver carp in spite of the abundant presence of this toxin in the intestines (for the liver, there was only one case when a relatively minor quantity was detected). These findings contrast with previous experimental results on rainbow trout. Perhaps silver carp has a mechanism to degrade MC-LR actively and to inhibit MC-LR transportation across the intestines. The depuration of MC-RR concentrations occurred slowly than uptakes in blood, liver and muscle, and the depuration rate was in the order of blood>liver>muscle. The grazing ability of silver carp on toxic cyanobacteria suggests an applicability of using phytoplanktivorous fish to counteract cyanotoxin contamination in eutrophic waters. 相似文献
49.
Molting and breeding entail major energetic costs for female crustaceans. However, females of some hermit crabs perform a
molt immediately prior to copulation (prenuptial molt). The evolutionary significance of the prenuptial molt was examined
in Pagurus hermit crabs, and two hypotheses were tested: (1) prenuptial molt might enhance the success of the present clutch by cleaning
the pleopods of females and thereby preventing eggs from being dislodged from the pleopods, and (2) prenuptial molt might
function for growth and increase future fecundity at the cost of energetic expenditure on the present brood. Although these
hypotheses are not mutually exclusive, our results rejected the former hypothesis and supported the latter hypothesis. All
four Pagurus species examined showed significant negative relationships between prenuptial molting and continuity of breeding; i.e., they
showed high molting frequency after they had a long rest period from breeding. Females of P. minutus increased their size through the prenuptial molt, and showed a decreased clutch size due to the molt. The number of dislodged
eggs increased if females molted in P. minutus. These results suggest that hermit crabs undergoing a prenuptial molt might not gain any clear immediate advantage of enhanced
survival of eggs in the present clutch, and that the prenuptial molt would mainly contribute to growth. 相似文献
50.