现阶段城市物流绿色化发展趋势的动因与对策研究

城市物流形成绿色化发展趋势的主要动因在于汽车运输业的迅速发展及其给城市环境与人们生活质量所造成的巨大影响上.二战以后,汽车运输业的迅速发展和在给社会提供迅速、便捷与准确服务的同时,也给城市的环境造成了严重的负面影响;尤其是由于城市路网和货物运输中心等基础设施既落后且缺乏科学的规划,无形中更加剧了城市物流与城市环境保护之间的矛盾.为实现城市物流的绿色化发展,实践中就有必要合理规划城市物流系统、通过多式联运以尽量降低卡车运输量的比例、积极应用信息技术以推进和实现物流管理的智能化、发展第三方物流实现共同配送.     

Investing in fertilizer–mining companies in times of food scarcity

The primary goal of the paper is to show the validity of investing capital in fertilizer–mining companies, both from a market return perspective for individual or institutional investors, or from a hedging standpoint for insurance companies and other economic actors exposed to inflation risk and high agricultural commodity prices. After providing some elements on the fertilizer market and describing the joint dynamics of corn, wheat and fertilizer prices over the last decade, we analyze an exhaustive sample of listed fertilizer producing companies over the years January 2004–December 2012. We show that their shares generated quite good returns over the whole period and extremely high ones during the years January 2004–December 2007, both in absolute terms and compared to their betas. We also exhibit that these returns display higher sensitivities to major agricultural indexes than to the World Bank Fertilizer Index, making the hedging argument quite compelling.     

燃气红外干化污泥对肥效及农用安全性的影响

自行研制的以煤气为能源的污泥干化中试成套设备，干化城市污水处理厂污泥，并对污泥肥效、病原体杀灭效果以及重金属含量的变化进行了研究，结果表明，经该套设备处理后，污泥的肥效保持不变，重金属含量也未发生变化，而污泥中的大肠杆菌和蛔虫卵全部被杀灭。处理后的污泥可在我国中、碱性土壤上作农肥使用。     

Drivers of deforestation and degradation for 28 tropical conservation landscapes

Analysing the drivers of deforestation and forest degradation in conservation landscapes can provide crucial information for conservation management. While rates of forest loss can be measured through remote sensing, on the ground information is needed to confirm the commodities and actors behind deforestation. We administered a questionnaire to Wildlife Conservation Society’s landscape managers to assess the deforestation drivers in 28 tropical conservation landscapes. Commercial and subsistence agriculture were the main drivers of deforestation, followed by settlement expansion and infrastructure development. Rice, rubber, cassava and maize were the crops most frequently cited as drivers of deforestation in these emblematic conservation landscapes. Landscape managers expected deforestation trends to continue at similar or greater magnitude in the future, calling for urgent measures to mitigate these trends.Electronic supplementary materialThe online version of this article (10.1007/s13280-020-01325-9) contains supplementary material, which is available to authorized users.     

农村商品流通网络模型及其发展趋势

农村商品流通是影响农业发展和农民消费的直接因素，完善农村商品流通网络对开拓农村市场，增加农民收入，发展农村经济具有推动作用。首先论述了农村商品流通网络的内涵；其次提出了基于主导要素的3种农村商品流通网络模型，即交易市场主导型、企业组织主导型和流通技术主导型，并对网络主体及其关系等方面进行了分析；最后提出了农村商品流通网络的发展趋势及其相应对策。     

热敏性能对洒水喷头控火效能影响的试验研究

为研究热敏性能对洒水喷头的动作性能、控火效能以及对建筑空间的保护性能的影响,在安装高度分别为3 m和8 m的情况下,采用快速响应喷头和特殊响应喷头进行4次足尺实体火试验。喷头公称动作温度均为68℃,响应时间指数(RTI)分别为35(m.s)1/2和65(m.s)1/2。试验结果表明,各种试验条件下,洒水喷头均能及时动作,且喷头动作后均能提供足够的消防保护,并有效将火势控制在限定区域内。采用快速响应喷头较特殊响应喷头约提前20%动作,且火场环境最高温度、顶板结构最高温度、热释放速率和货物烧损率均较特殊响应喷头低。安装高度越高,热敏性能对洒水喷头控火效能的影响越明显。     

农产品中黄曲霉素B1的酶联免疫吸附分析法

使用牛血清白蛋白(BSA)与黄曲霉素B_1(AFB_1)的结合物免疫兔子获得了高特异性、高效价的抗AFB_1的抗体,用此抗体建立了测定AFB_1的酶联免疫吸附分析法(ELISA),最低检出限为1.0pg/m。应用于花生、花生酱、玉米和大豆等农产品中AFB_1分析,其回收率在81—116％范围,变异系数在1.51—10.65％之间。此法具有简单、快速和适于大批量样品分析等优点。     

现阶段城市物流绿色化发展趋势的动因与对策研究

城市物流形成绿色化发展趋势的主要动因在于汽车运输业的迅速发展厦其给城市环境与人们生活质量所造成的巨大影响上。二战以后。汽车运输业的迅速发展和在给社会提供迅速、使捷与准确服务的同时，也培城市的环境造成了严重的负面影响；尤其是由于城市路网和货物运输中心等基础设施既落后且跌乏科学的规划，无形中更加剧了城市物流与城市环境保护之间的矛盾。为实现城市物流的绿色化发展，实战中就有必要合理规划城市物流系统、通过多式联运以尽量降低卡车运输量的比例、积极应用信息技术以推进和实现物流管理的智能化、发展第三方物流实现共同配送。