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废计算机及配件属于国家禁止进口废物
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《新疆环境保护》 2002年第3期16-16,共1页
关键词 废计算机 配件 中国 固体 进口贸易
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计算机企业推行循环经济的研究与实践 被引量:1
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作者 潘艺鹏 彭荔红 《环境保护》 CAS CSSCI 北大核心 2008年第2期33-35,共3页
本文针对国内循环经济研究在企业层面尤其是电子企业中开展较少的实际,分析废计算机企业推行循环经济的必要性,以解决大量废计算机带来的污染危害问题。给出计算机循环经济的流程,分析废计算机组件材料的再利用方式与经济价值,并以某品... 本文针对国内循环经济研究在企业层面尤其是电子企业中开展较少的实际,分析废计算机企业推行循环经济的必要性,以解决大量废计算机带来的污染危害问题。给出计算机循环经济的流程,分析废计算机组件材料的再利用方式与经济价值,并以某品牌计算机为例计算循环经济的收益。结果表明不仅能增强企业的环境友好性,而且可为企业带来一定的经济效益,节约社会资源。 展开更多
关键词 循环经济 经济价值 废计算机再利用
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Reuse of clips in cartoon animation based on language instructions
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作者 魏宝刚 朱文浩 于金辉 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2006年第2期123-129,共7页
This paper describes a new framework for reusing hand-drawn cartoon clips based on language understanding ap- proach. Our framework involves two stages: a preprocessing phase, in which a hand-drawn clip library with m... This paper describes a new framework for reusing hand-drawn cartoon clips based on language understanding ap- proach. Our framework involves two stages: a preprocessing phase, in which a hand-drawn clip library with mixed architecture is constructed, and the on-line phase, in which the domain dependent language instructions parsing is carried out and clips in the clip library are matched by use of some matching values calculated from the information derived from instruction parsing. An im- portant feature of our approach is its ability to preserve the artistic quality of clips in the produced cartoon animations. 展开更多
关键词 Language instruction Reuse of clips Content management
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Motion analysis of waste rock in gas-solids fluidized bed in coal dry beneficiation
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作者 郭迎福 陈安华 +2 位作者 张永忠 邓志鹏 毛树楷 《Journal of Coal Science & Engineering(China)》 2002年第2期88-92,共5页
Through the analysis of forces acting on the waste rock in the gas solid fluidized bed, the waste rock velocity equations and displacement equations in the gas solids fluidized bed were achieved and the influential fa... Through the analysis of forces acting on the waste rock in the gas solid fluidized bed, the waste rock velocity equations and displacement equations in the gas solids fluidized bed were achieved and the influential factors of the waste rock motion in the fluidized bed were studied in this paper. The conclusions show that the primary factors influencing the waste rock motion are the waste rock grain size and the scraper velocity according to the computer simulation. This has provided the theoretical foundation both for improving the separating effect and ascertaining the length of the separating cell. 展开更多
关键词 gas solids fluidized bed coal dry beneficiation motion analysis
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Methodology for Precious Metal Recovery in Computer Printed Circuit
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作者 Miguel Aguilar Cortest Martha Lilia Dominguez Patifio +2 位作者 Antonio Rodriguez Martinez Rene Guardian Tapia Rosa Maria Melgoza Aleman 《Journal of Chemistry and Chemical Engineering》 2013年第8期759-766,共8页
The life of electronic equipment is becoming increasingly shorter and its replacement always generates a quantity of waste increase, giving rise to a problem of environmental character and still needed new options of ... The life of electronic equipment is becoming increasingly shorter and its replacement always generates a quantity of waste increase, giving rise to a problem of environmental character and still needed new options of solid waste management that will contribute to global sustainable development. Parts of these waste are TCI (the card's printed circuit) which containing dangerous elements and turns them into a polluting material from the soil, water and air, being harmful to human health if there is to proper and responsible way, so the recycling of TCI to obtain precious metals is an example of industrial materials that can be recycled. Despite this, large quantities of these are not recycled and some others are not considered. The objective of this work is to present a systematic and ecological methodology for the recovery of valuable materials contained in parts of used in computers, circuit boards using a leaching process. The method determines a set of variables to evaluate the kinetics of the reaction and the leaching of metals that form the substrate of metal and to establish the parameters that affect the rate of leaching of metals through a sensitivity analysis, to identify design alternatives. It determines the quantity and percentages that constitutes the motherboard, processor, video cards, accelerator graphics, network and memory cards RAM, among others and its content of metals such as Cu, Fe, Ag, Au and Pt. 展开更多
关键词 Precious metals LEACHING waste electrical and electronic equipment printed circuit board.
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Effect of dry density on ^(125)I diffusion in GMZ bentonite 被引量:12
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作者 WU Tao LI JinYing +5 位作者 DAI Wei XIAO GuoPing SHU FuJun YAO Jun SU YuLan SHI Lei 《Science China Chemistry》 SCIE EI CAS 2012年第9期1760-1764,共5页
Gaomiaozi (GMZ) bentonite is regarded as the favorable candidate backfilling material for a potential repository in China. It is important to understand the diffusion behavior of ^125I in GMZ bentonite and compare t... Gaomiaozi (GMZ) bentonite is regarded as the favorable candidate backfilling material for a potential repository in China. It is important to understand the diffusion behavior of ^125I in GMZ bentonite and compare the diffusion behavior in GMZ and other types of bentonite like MX-80, Avonlea, etc. Therefore, through- and out-diffusion experiments were conducted to obtain the effective diffusion coefficient (De) and distribution coefficient (Kd). A computer code named Fitting for diffusion coefficient (FDP) was used for the experimental data processing and theoretical modeling. At the dry density of GMZ bentonite from 1600-2000 kg/m^3, the De values of ^125I were (2.4-20.4)×10 ^-12 m^2/s and Ka values were constants. At dry density above 1800 kg/m^3, the diffusion behaviors were almost the same, indicating that the anion exclusion was ineffective. Out-diffusion results showed that the species of ^125I may be changed during the diffusion processing. It was probably caused by some organic mat- ters or reducing substances in GMZ bentonite. Since the main composition of bentonite is montmorillonite, similar diffusion parameters were obtained in GMZ and other types of bentonite. The relationship of DE and accessible porosity (εacc) could be described by Archie's law with exponent n = 1.2-2.8 for ^125I diffusion in bentonite, whereas n = 2.0 in GMZ bentonite. Fur- thermore, bentonite with the dry density of 1800 kg/m^3 was proposed as the backfilling materials used in the construction of high level radioactivity waste repository. 展开更多
关键词 ^125I DIFFUSION GMZ bentonite SPECIES distribution coefficient
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