Phosphorus removal from wastewater by waste concrete: influence of P concentration and temperature on the product

Environmental Science and Pollution Research - This study investigated the feature of phosphorus uptake by low-cost waste concrete. Adsorption isotherms, metal dissolution, influence of P...     

土壤温度上升与森林衰退

土壤温度上升可能会引起土壤产生过量的ＨＮＯ３，而过量的ＨＮＯ３在酸性土壤中将导致Ａｌ（３＋）浓度的升高和盐基阳离子的流失，使养分失调，细根坏死。土壤温度上升还可能会改变土壤有机质动力学、土壤水文学和土壤物理学，从而改变森林生境特征，影响森林的正常生长。     

分子碰撞与惯性分离原理在油烟净化中的应用

应用分子碰撞和惯性分离原理,对油烟烟气进行分离是一种新的油烟净化方法.阐述了该方法的净化过程、基本原理和装置的最佳条件.研究结果表明：该方法是一种新型、高效、实用的油烟净化方法,提出了进一步完善该方法的研究内容.     

嘉陵江流域坡耕地“生态农业旅游”垂直景观模式

从治理水土流失角度出发，提出了坡耕地“生态农业旅游”技术与示范。其垂直生态景观模式按坡度和等高线布置：在坡度大于25°的山坡顶形成水保林木区，坡上15°～25°的陡坡种植桃树，坡中5°～15°的斜坡种植枇杷，坡下小于5°的缓坡地带种植特种水果、瓜类及蔬菜，坡底形成“稻—鱼”和“藕—鱼”特色水域区。道路系统设计为环山而下的水泥主路、观景石板干路、埂边地界小路三级，道路两侧实施还林还草。“农家乐”型旅游接待自然分布在试验区内，同时在坡上建立旅游“一条街”、坡底试验旅游产业化经营。果园内实施多熟作物覆盖、间种套种。垂直生态景观产生了独特而丰富的景观效果，并具有较好的生态功能、经济功能和社会功能。     

Where,why, and to what extent have rangelands in the Karoo,South Africa,desertified

We used simple questionnaire surveys to obtain rough categorical information on the status of semiarid and arid rangelands in the Karoo, South Africa. We sent questionnaires to extension officers of the Department of Agricultural Development, asking them to rank the condition of the rangeland in their extension districts (usually about 500 farms) on a three- or five-point scale. The questionnaire also sought information on the possible reasons for changes in the condition of the rangelands; vegetation types most at risk on mismanaged rangelands; and changes in the status of plants, birds, and mammals. Extension officers rated 35% of the semiarid rangelands in southwestern South Africa (the Karoo and southern Kalahari Desert) as being in poor condition. There was some congruency between the perceived condition of the agricultural extension district and the percentage that the stocking rate had decreased. Rangeland condition in more arid areas tends to be poor. Stocking rates have decreased disproportionately more in arid areas than in the more mesic areas of southwestern South Africa. Grasses were rated as the most threatened group of plants, and succulents the least threatened group. Overgrazing in the past was considered to be the most important cause of present-day rangeland condition, followed by present overstocking of rangelands. Antelope were considered more threatened by rangeland management than mammalian carnivores. Avian raptors and bustards, gamebirds, and tortoises were all perceived to be threatened by rangeland mismanagement.     

上海浦东东滩与九段沙生态环境的比较

上海浦东国际机场建设占用了部分的滩涂，此部分滩涂是鸟类栖息迁徒的活动区域之一。研究和比较了长江口浦东东滩和相邻九段沙的生态环境特点，评述了九段沙作为鸟类栖息迁徒重要“驿站”可能性的重要依据，并提出了相应的建议。     

贵州高岭土的成分与性质研究

讨论了贵州高岭土和埃洛石粘土的产出特征、化学成分、矿物成分、铁、钛的赋存状态、热转变及工艺特性等。     

固体废物管理技术进展

概述了固体废物管理技术近年来的主要进展,这些进展包括,固体废物从“摇蓝到坟墓”的全过程管理,即从废物产生到收集、运输贮存,再循环,再利用,处理直至最终处理过程所涉及到的：废物最小量化管理技术;废物转移跟踪管理中产生者,运输者,处理处理者,主管当局的职责、主管当局的职责,义务和管理方式;废物经营者向主管当局申请许可证的程序和申请。时,对废物交换制度和废物管理信息系统也作了概要介绍。     

超塑性材料轴对称镦粗时的变形力计算

本文探讨了变分理论在超塑性成形方面的应用,建立了适合超塑性材料的变分理论的基本方程,并比超塑性材料轴对称镦粗为例验证了这些方程的正确性。     

瑞典全面推广绿色能源

最近，瑞典官方高调宣布：到2020年，瑞典将完全结束对石油的依赖，成为第一个完全使用可再生能源的国家。如果这一梦想成真，那么人类摆脱对化石能源依赖、面对无油世界的底气，无疑将会大大增强。[编者按]