全文获取类型
收费全文 | 1038篇 |
免费 | 21篇 |
国内免费 | 52篇 |
专业分类
安全科学 | 32篇 |
废物处理 | 211篇 |
环保管理 | 241篇 |
综合类 | 412篇 |
基础理论 | 45篇 |
环境理论 | 1篇 |
污染及防治 | 84篇 |
评价与监测 | 71篇 |
社会与环境 | 14篇 |
出版年
2024年 | 2篇 |
2023年 | 8篇 |
2022年 | 15篇 |
2021年 | 17篇 |
2020年 | 31篇 |
2019年 | 12篇 |
2018年 | 8篇 |
2017年 | 12篇 |
2016年 | 21篇 |
2015年 | 24篇 |
2014年 | 108篇 |
2013年 | 67篇 |
2012年 | 32篇 |
2011年 | 66篇 |
2010年 | 19篇 |
2009年 | 52篇 |
2008年 | 43篇 |
2007年 | 56篇 |
2006年 | 52篇 |
2005年 | 33篇 |
2004年 | 40篇 |
2003年 | 50篇 |
2002年 | 48篇 |
2001年 | 41篇 |
2000年 | 46篇 |
1999年 | 33篇 |
1998年 | 42篇 |
1997年 | 29篇 |
1996年 | 25篇 |
1995年 | 13篇 |
1994年 | 35篇 |
1993年 | 15篇 |
1992年 | 5篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有1111条查询结果,搜索用时 15 毫秒
881.
We investigated the thermal properties and behavior of bromine on the thermal decomposition of paper-based phenolic laminate
wastes containing polybrominated flame retardants. The thermal properties of the phenolic laminate wastes were measured with
a thermogravimeter and a conduction-type scanning calorimeter (TG-CSC). The weight loss of the wastes on thermal decomposition
was mainly in three phases between 40°C and 600°C. The enthalpy (ΔH) of the thermal decomposition was 104 cal/g. The material balance of the decomposition components was measured with batch-type
thermal decomposition equipment. The ratios of carbon residue, liquid, and gas on decomposition at 800°C in a vacuum were
37 wt. %, 48 wt. %, and 15 wt. %, respectively. The bromine contents in the carbon residue and liquid were less than 0.02 wt.
% and 10 wt. %, respectively. These results are useful both in the carbonization process of these wastes and in the application
of carbon residue as carbon materials.
Received: August 11, 2000 / Accepted: March 7, 2001 相似文献
882.
为探讨废塑料资源化产品对土壤酶活性的影响,通过室内培养试验研究了废塑料资源化产品暴露后土壤中过氧化氢酶和脲酶活性的变化.结果表明:废塑料资源化产品对土壤酶活性具有显著影响.250mg·kg-1、1250mg·kg-1、7250mg·kg-1废塑料资源化产品浓度处理对土壤中过氧化氢酶和脲酶影响明显不同.在土壤培养l~5d内,添加废塑料资源化产品的3个浓度处理土壤中过氧化氢酶活性显著低于对照(p<0.05),表现出明显的抑制作用,且浓度越高抑制作用越强.而后(5~35d),低浓度(250mg·kg-1)废塑料资源化产品对土壤过氧化氢酶一直表现为激活作用,但是,高浓度(1250mg·kg-1和7250mg·kg-1)处理对土壤过氧化氢酶活性则表现为激活-抑制-激活作用,且抑制、激活程度与处理浓度成呈相关.3个废塑料资源化产品浓度处理对脲酶活性影响在培养1~28d内主要是激活作用,且激活作用随着处理浓度的增大而增强,而后(28~35d)对脲酶活性表现为抑制作用. 相似文献
883.
884.
We employed the contingent valuation method to estimate the willingness to pay of the respondents to improve the waste collection system in Dhaka city, Bangladesh. Our objective was to estimate how WTP differs between respondents who received or did not receive door to door waste collection. The methodology consisted of asking people directly about their willingness to pay an additional waste collection service charge to cover the costs of a new waste management project. The mean value of WTP for areas that received waste collection service areas was higher than for residents of areas that did not but the difference was not statistically significant. The aggregate value of WTP of the respondents in Dhaka city was 7.6 million Taka (USD0.1 million). 相似文献
885.
Willingness to Pay for Improving the Residential Waste Disposal System in Korea: A Choice Experiment Study 总被引:1,自引:0,他引:1
This study attempts to apply choice experiments with regard to the residential waste disposal system (RWDS) in Korea by considering
various attributes that are related to RWDS. Using data from a survey conducted on 492 households, the empirical analysis
yields estimates of the willingness to pay for a clean food-waste collection facility, the collection of small items (such
as obsolete mobile phones and add-ons for personal computers), and a more convenient large waste disposal system. The estimation
results of multinomial logit models are quite similar to those of nested logit models. The results reveal that residents have
preferences for the cleanliness of facilities and the collection of small items. In Korea, residents are required to purchase
and attach stickers for the disposal of large items; they want to be able to obtain stickers at not only village offices but
also supermarkets. On the other hand, the frequency of waste collection is not a significant factor in the choice of the improved
waste management program.
相似文献
Seung-Hoon YooEmail: |
886.
This paper considers two alternative feedstocks for bioethanol production, both derived from household waste—Refuse Derived Fuel (RDF) and Biodegradable Municipal Waste (BMW). Life Cycle Assessment (LCA) has been carried out to estimate the GHG emissions from bioethanol using these two feedstocks. An integrated waste management system has been considered, taking into account recycling of materials and production of bioethanol in a combined gasification/bio-catalytic process. For the functional unit defined as the ‘total amount of waste treated in the integrated waste management system’, the best option is to produce bioethanol from RDF—this saves up to 196 kg CO2 equiv. per tonne of MSW, compared to the current waste management practice in the UK.However, if the functional unit is defined as ‘MJ of fuel equiv.’ and bioethanol is compared with petrol on an equivalent energy basis, the results show that bioethanol from RDF offers no saving of GHG emissions compared to petrol. For example, for a typical biogenic carbon content in RDF of around 60%, the life cycle GHG emissions from bioethanol are 87 g CO2 equiv./MJ while for petrol they are 85 g CO2 equiv./MJ. On the other hand, bioethanol from BMW offers a significant GHG saving potential over petrol. For a biogenic carbon content of 95%, the life cycle GHG emissions from bioethanol are 6.1 g CO2 equiv./MJ which represents a saving of 92.5% compared to petrol. In comparison, bioethanol from UK wheat saves 28% of GHG while that from Brazilian sugar cane – the best performing bioethanol with respect to GHG emissions – saves 70%. If the biogenic carbon of the BMW feedstock exceeds 97%, the bioethanol system becomes a carbon sequester. For instance, if waste paper with the biogenic carbon content of almost 100% and a calorific value of 18 MJ/kg is converted into bioethanol, a saving of 107% compared to petrol could be achieved. Compared to paper recycling, converting waste paper into bioethanol saves 460 kg CO2 equiv./t waste paper or eight times more than recycling. 相似文献
887.
Kunihiro Fukui Satoshi KidoguchiNaoki Arimitsu Kenji JikiharaTetsuya Yamamoto Hideto Yoshida 《Journal of environmental management》2009
Waste incineration fly ash was successfully recycled to calcium phosphate hydrogel, a type of fast proton conductor. The crystallized hydrogel from incineration fly ash had a lower electric conductivity and a lower crystallinity than that from calcium carbonate reagent. However, the difference in electric conductivity between these crystallized hydrogels decreases with temperature. This was due to the presence of potassium in the incineration fly ash. The fuel cell with a membrane electrode assembly (MEA) using the calcium phosphate hydrogel membrane prepared from incineration fly ash was observed to generate electricity. The performance of this fuel cell was almost equal to that of a mixture of K2CO3 and CaCO3 reagents; further, the performance of the former was superior to the fuel cell with a perfluorosulfonic polymer membrane at temperatures greater than approximately 85 °C. 相似文献
888.
Co-combustion tests of municipal solid waste and bromine-containing waste plastics have been performed in the TAMARA test
incinerator in order to investigate the fate of bromine in waste combustion. HBr is the main bromine combustion product. Approximately
50% of the bromine inventory stays in the grate ashes, which is much more than is found for chlorine. The percentage of bromine
transferred into the fly ash also exceeds that of chlorine. There is a strong indication that bromine has a promoting effect
upon the volatility of most of the heavy metals that are typically mobilized by chlorine.
Received: February 2, 2000 / Accepted: March 3, 2000 相似文献
889.
Yasuhiko Wada Takuma Okumoto Nariaki Wada 《Journal of Material Cycles and Waste Management》2009,11(1):82-94
To form a sustainable recycling society, control industrial waste, and reutilize resources from waste to the greatest extent
possible, we evaluated the waste collection system in terms of CO2 emissions, the energy consumed, the amount recycled, the final disposal amount, and cost, particularly addressing the collection
and transportation processes of domestic waste and using LCA evaluation for multiple policies. The results showed that enforcement
of a combination of five optimal policies (as assessed in terms of their evaluation indexes), i.e., the use of clean energy
gas-powered vehicles, the station method, collection of waste segregated into 11 categories, collective collection, and simple
pay-as-you-go charges, might cultivate residents’ sense of responsibility in terms of controlling waste discharge. 相似文献
890.
The lead removal from the metallic mixture of waste printed circuit boards by vacuum distillation was optimized using experimental design, and a mathematical model was established to elucidate the removal mechanism. The variables studied in lead evaporation consisted of the chamber pressure, heating temperature, heating time, particle size and initial mass. The low-level chamber pressure was fixed at 0.1 Pa as the operation pressure. The application of two-level factorial design generated a first-order polynomial that agreed well with the data for evaporation efficiency of lead. The heating temperature and heating time exhibited significant effects on the efficiency, which was validated by means of the copper–lead mixture experiments. The optimized operating conditions within the region studied were the chamber pressure of 0.1 Pa, heating temperature of 1023 K and heating time of 120 min. After the conditions were employed to remove lead from the metallic mixture of waste printed circuit boards, the efficiency was 99.97%. The mechanism of the effects was elucidated by mathematical modeling that deals with evaporation, mass transfer and condensation, and can be applied to a wider range of metal removal by vacuum distillation. 相似文献