普通聚烯烃类塑料生物降解研究进展

介绍了高分子材料生物降解的概念、生物降解的作用方式,影响生物降解的因素,并且分析了高分子聚合物生物降解的研究现状,从添加易生物降解的填料法和添加光氧助剂-生物降解法这两个方面总结了普通聚烯烃类塑料生物降解研究进展,指出了今后研究的重点。     

我国现行生活饮用水卫生保障系统

对我国现行的供水条例、水质标准、二次供水设施规范、涉及饮用水卫生安全产品标准、供水单位卫生规范、标准检验方法等进行了总结,并对该卫生保障系统的实行和有效性进行了思考.     

Increasing silver leaching rate from leaching-resistant zinc residues by thiourea leaching method with pressurized preoxidation process

1　ＩＮＴＲＯＤＵＣＴＩＯＮＡｔｐｒｅｓｅｎｔ ,ｚｉｎｃｉｓｐｒｏｄｕｃｅｄｂｙｔｈｅｈｙｄｒｏｍｅｔａｌｌｕｒｇｙ ｅｌｅｃｔｒｏａｎａｌｙｓｉｓｍｅｔｈｏｄｉｎｍｏｓｔｚｉｎｃｓｍｅｌｔｉｎｇｐｌａｎｔｓ .Ｅａｃｈｙｅａｒ,ｍｉｌｌｉｏｎｓｔｏｎｓｏｆｈｙｄｒｏｍｅｔａｌｌｕｒｇｉｃａｌｚｉｎｃｒｅｓｉｄｕｅｓａｒｅｄｉｓｃｈａｒｇｅｄｆｒｏｍＣｈｉｎｅｓｅｓｍｅｌｔｉｎｇｐｌａｎｔｓ ,ｗｈｉｃｈａｒｅｈｉｇｈｌｙａｃｉｄｉｃａｎｄｃｏｎｓｉｓｔｏｆｇｒｅａｔｄｅａｌｏｆｓｉｌｖｅｒａｎｄｏｔ…     

基于AVR单片机温室智能控制系统的设计

设计了一种用于植物工厂的温室智能控制系统．采取AVR单片机完成下位机设计,通过RS-485总线与上位机通信,并定义了通信协议,利用VC6．0开发人机界面．将该系统用于对温室环境因子的监控,用户可以根据植物实际生长需要选择适当的控制参数,实现对温室环境的管理．     

复合亚铁混凝剂的制备及性能研究

利用酸洗废液为原料制备复合亚铁混凝剂,用制得的复合亚铁对高岭土、染料模拟废水做混凝实验,与市售的七水硫酸亚铁和聚铁做比较,研究了其除浊脱色性能。结果表明,复合亚铁有电中和、氧化还原及卷扫作用,混凝效果优于七水硫酸亚铁和聚铁,复合亚铁可应用于多种工业废水处理。     

陶瓷工业清洁生产浅论

在分析陶瓷工业污染产生原因及现状的基础上 ,探讨了陶瓷工业清洁生产的途径及措施 ,指出以清洁生产为主 ,末端控制为辅的综合污染防治方式是实现陶瓷工业持续发展的必然选择     

新型钞票防伪技术面世

Trebor包装公司推出的蔬菜磁性保鲜包装是将充气包装技术与先进的磁性纸包装技术的结合使用。蔬菜用带有磁性纸的薄膜袋装起来，经抽真空先将袋内的空气排除掉，再充入惰性气体，包装袋密封后，磁性纸能不断放射出无害的长波红外辐射，从而限制水分子中细菌的活动，同时也能吸收少量乙烯气。另一种磁性纸含有能消除气味的成分，同样能吸收大量乙烯气。该包装采用计算机控制，能大大延长蔬菜的自然货架期，深具市场潜力。     

晨鸣加入中国条码系统

山东晨鸣纸业集团经国家质检总局中同物品编码中心批准，已于日前加入中国条码系统，厂商识别代码为69329068。     

城市有机垃圾厌氧消化痕量激活剂的促进作用及产能研究

城市有机垃圾厌氧消化处理相对其它处理方法而言是一种具有广阔应用前景的垃圾资源化方法，它能充分利用其含有的生物质能．本文研究了痕量金属Fe、Co、Ni对产甲烷菌的激活作用．以有机生活垃圾为基质，进行干式中温厌氧消化，对比研究结果表明：在其他条件相同的情况下，投加痕量金属离子比不投加的系统产气量增加了43.4％，生物气的甲烷含量提高了5.1％，COD去除率提高了10.2％．同时，它还有利于缩短停留时间并减小消化反应器的体积．     

Impacts of land-use change on ecosystem service value in Changsha, China

Changsha, a typical city in central China, was selected as the study area to assess the variations of ecosystem service value on the basis of land-use change. The analysis not only included the whole city but also the urban district where the landscape changed more rapidly in the center of the city. Two LANDSAT TM data sets in 1986 and 2000 and land use data of five urban districts from 1995 to 2005 were used to estimate the changes in the size of six land use categories. Meanwhile, previously published value coefficients were used to detect the changes in the value of ecosystem services delivered by each land category. The result shows that the total value of ecosystem services in Changsha declines from 1 009.28 million per year in 1986 to1 009.28 million per year in 1986 to 938.11 million per year in 2000. This decline is largely attributable to the increase of construction land, and the conversion from woodland and water body to cropland to keep the crop production. In the five districts, there is $6.19 million decline in ecosystem service value between 1995 and 2005. Yuelu District has the highest unit ecosystem service value while Yuhua District has the lowest one. This may be attributed to the greater conversion from cropland and grassland to woodland and water body with the increase of construction land in Yuelu District. It is suggested that the increase rate of construction land should be controlled rigorously and the area of woodland and water body should be increased or at least retained in the study area.