离子交换法从烟道灰中提取铼的工艺研究

本工艺提出了一种从钼冶炼烟道灰中湿法回收铼的方法,过程中采用在稀硫酸体系中氧化浸出铼,水解及硫化法二段除钼,离子交换法富集铼,高氯酸淋洗,重结晶法精制,铼酸钾氢还原,铼的总回收率可达90%以上,有价金属得到了充分利用。     

Determining the economic gains from regulation at the extensive and intensive margins

Among the second-best approaches for the regulation of pollution,little attention has been paid to the distorting effect of intensivemargin policies on the extensive margin. This article shows,within a dynamic framework, that regulation of the intensivemargin has to be complemented by regulation of the extensivemargin. Depending on the elasticity of the pollution functionwith respect to nitrogen use, the appropriate regulation atthe extensive margin is zero, a tax or a subsidy. We show empiricallythat combining a nitrogen tax with land-use taxes is about 18per cent more cost efficient than a nitrogen tax alone and 58per cent more efficient than off-site abatement in the formof groundwater treatment.     

大学英语分层次个性化教学模式探索

21世纪初教育部正式启动大学英语教学改革,学者和教师针对课程设置展开了积极的探索和讨论。高校应该充分考虑学生的差异,对学生进行不同层次教学,进行个性化培养。要保证学生在大学英语学习中具有选择权和主动权。EGP、ESP和EGE的教学并不矛盾,可以融为一体创建大学英语分层次个性化教学模式,满足学生和社会对于各种人才的多样化要求。     

含钒石煤提钒的试验研究

以含钒石煤原矿及浮选精矿为原料,分别进行了原矿、选矿精矿直接酸浸及活化-浸出工艺的研究。研究结果表明：精矿在酸矿比0.6、200℃活化-浸出条件下,钒的浸出率为90.69%,酸耗约35 t酸/t V2O5;精矿活化-浸出工艺具有处理量小、无需加入添加剂、酸耗低等经济、技术上的优势。     

高职高专物流专业实践教学和技能教学的探索

高职高专物流专业的企业教学可分为实践教学和技能教学,实践教学就是企业技术人员对生产计划作业、采购计划作业、仓库管理作业、货物配送作业和货物发运作业的教学;技能教学就是企业师傅培养学生具有熟练的操作技能,让学生熟练掌握货物包装技能、叉车操作技能、货物摆放技能、信息和订单处理技能、运输方案选择等技能,直至成为物流岗位操作工。     

污水处理厂污泥重金属含量及其浸出毒性分析——以上海某污水处理厂为例

为了评价污水处理厂污泥及其浸出液的潜在生态环境风险,以上海嘉定区某污水处理厂为例,采用硫酸/硝酸法和醋酸缓冲溶液法对污泥进行重金属总量和浸出毒性检测分析。同时,也研究了浸出液pH值、浸出时间及消解条件对浸出的影响。试验结果表明：1）污泥中Cu,Zn,Ni和Cr的含量分别是城市污泥中相应物质的平均含量的20,7.5,15和13倍,而Pb和Cd的含量与城市污泥的平均含量差不多;2）污泥中Cu与Cr主要以稳定形态存在,不同浸提方法下的浸出量相当,对于Zn和Ni,醋酸缓冲溶液的浸出量分别约为硫酸/硝酸溶液的22倍和18倍;3）浸出时间为20 h时浸出达到平衡,浸出液pH值对污泥重金属浸出能力的影响,因重金属元素种类的不同而存在较大差异,电热板消解和微波消解对浸出几乎没有影响;4）醋酸缓冲溶液制备的浸出液中,Ni的浸出质量浓度为16.3 mg/L,高于鉴别标准限值5 mg/L,而硫酸/硝酸浸提方法中重金属浸出浓度均未超过规定值。因此,该污水处理厂的污泥不适合卫生填埋,应积极寻求新技术对污泥进行合理处置并减少其潜在生态环境风险。     

哈尔滨地区岗阜状平原上部粉质粘土变化规律与成因

本文通过作者10余年的工作经验及所学的专业知识,总结了哈尔滨地区岗阜状平原上部粉质粘土的变化规律,并对形成这种变化规律的原因进行了分析。     

铜渣中回收Zn、Cu的试验研究

针对湿法炼锌过程中产出的铜渣的回收利用,开展铜富集的研究,分别进行了铜渣的液固比、浸出时间、酸度和压力对铜浸出富集的试验研究。研究结果表明,在常压条件下,液同比为5：1、浸出时间4h、酸度120-130g／L,铜渣中锌的浸出率达68．43％、铜浸出率达98．10％,铜浸出液经净化后所产粗铜富集渣品位大于70％。     

Where to implement local biotech innovations? A framework for multi-scale socio-economic and environmental impact assessment of Green Bio-Refineries

Green Bio-Refineries (GBRs) have economic and environmental potentials through changing land use from cereals to grass production and provision of grass-based protein feed for livestock production and other valuable byproducts. However, the potentials are dependent on local conditions of the GBRs, such as land productivity, environmental sensitivity and transport distances for feedstock as well as the regional economy which GBRs are a part of. In this paper, we compare the total (direct, indirect and induced) effects of different location choices of GBRs in Denmark at different (municipal, regional, national) scales − a key step for decisions about development of GBRs from both investors' and authorities' perspectives. We integrate a local life-cycle assessment (LCA), a geographic information system (GIS) analysis and an economic-environmental input-output (EEIO) based model (LINE) into a common framework (GIS-LCA-EEIO). We show that locating GBRs in Western Denmark, where the soils are primarily sandy and livestock densities are high, generates higher socio-economic gains than in Eastern Denmark, where the soils are primarily loamy and the concentrations of livestock are lower. We conclude by sketching out priority areas for developing GBRs and discuss the policy implications of the results within the context of development of a bio-based economy.     

From Microlevel Decisions to Landscape Changes: An Assessment of Agricultural Conservation Policies

The growth in conservation programs has created a need for modeling frameworks capable of measuring microlevel behavioral responses and macrolevel landscape changes. This paper presents an empirical model that predicts farmers' production practices and the resulting levels of agricultural runoffs at more than 42,000 agricultural sites in the upper-Mississippi river basin under alternative conservation policies. Results suggest that payments for conservation tillage and crop rotations increase the use of these conservation practices. However, the acreage response is inelastic and the programs are not likely to be cost effective on their own for addressing hypoxia problem in the Gulf of Mexico.