农村电子商务环境下物流管理系统的设计与分析

本文介绍了在农村电子商务环境下物流管理系统的设计与分析,对功能模块和业务流程进行了分析与设计,并提出了利用Oracle 10i技术和EA server组件服务器的三层结构。     

武汉市渔业生产力与其人文影响因素的灰色关联性分析

以位于长江中下游平原的"百湖之市"--武汉市为研究对象,利用灰色关联模型分析了武汉市渔业生产力与其人文影响因素的互动关系.研究结果表明:各项人文影响因素与渔业中鱼类、虾蟹类、贝类和其他类生产量的关联度均在0.6以上,人文因素是影响渔业产量的基本因素;总体上化肥用量、养殖面积和城市化对渔业生产的影响较大,而人口密度、人口素质和人均GDP的影响较小;化肥用量、城市化、养殖面积和人口密度是影响武汉渔业生产中鱼类、贝类和其他类产量的主要人文驱动因子;人均GDP和人口素质是影响武汉虾蟹产量的主要人文驱动因子.     

略谈ESA杂拼型理论在空乘基础英语教学中的运用

哈默ESA理论提出：在英语教学中,投入、学习和运用三种要素通过它们之间顺序的变化,相互组合构成三种不同的教学模式。本文结合空乘专业学生的特点．在英语教学中采用ESA杂拼型教学模式．有效地将以教师讲授为主的教学模式转变为在教师指导下以学生为主体的教学模式．取得了良好的教学效果。     

精密仪器设计实验教学改革探讨

介绍了精密仪器设计课程教学内容及课内实验设置情况,分析了该课程实验教学中存在的主要问题,提出了实验教学改革措施,以提升该课程的教学质量。     

我国内河水运经济投融资体制建设研究——以宜宾市水运环境为例

传统意义的内河水运经济是一种可持续发展的运输经济,具有明显的外部效应。随着市场经济的发展和人们文化生活需求的提升,内河经济渐渐演变为以观光旅游为主、周边城市配套建设为辅的区域性经济类型之一。本文拟以四川省宜宾市水运经济的发展为调研主体,对不同投融资模式进行探索,在适当进行对比分析和风险评估基础上,建立适合我省内河水运市场的安全、多元的投融资机制,进而为我国水运经济的可持续性发展提供理论依据和实例。     

图书馆联盟运作模式的发展趋势——公司制联盟和策略联盟

文章在阐述了图书馆联盟的定义以及其运作模式的基础上,提出公司制联盟和图书馆策略联盟将是图书馆联盟发展的未来趋势,并对这两种形式给出定义,对图书馆在组建这两种联盟时所应注意的问题提出了看法.     

Bio-inspired untethered fully soft robots in liquid actuated by induced energy gradients

Soft robotics with new designs, fabrication technologies and control strategies inspired by nature have been totally changing our view on robotics. To fully exploit their potential in practical applications, untethered designs are preferred in implementation. However, hindered by the limited thermal/mechanical performance of soft materials, it has been always challenging for researchers to implement untethered solutions, which generally involve rigid forms of high energy-density power sources or high energy-density processes. A number of insects in nature, such as rove beetles, can gain a burst of kinetic energy from the induced surface-energy gradient on water to return to their familiar habitats, which is generally known as Marangoni propulsion. Inspired by such a behavior, we report the agile untethered mobility of a fully soft robot in liquid based on induced energy gradients and also develop corresponding fabrication and maneuvering strategies. The robot can reach a speed of 5.5 body lengths per second, which is 7-fold more than the best reported, 0.69 (body length per second), in the previous work on untethered soft robots in liquid by far. Further controlling the robots, we demonstrate a soft-robot swarm that can approach a target simultaneously to assure a hit with high accuracy. Without employing any high energy-density power sources or processes, our robot exhibits many attractive merits, such as quietness, no mechanical wear, no thermal fatigue, invisibility and ease of robot fabrication, which may potentially impact many fields in the future.     

Serrated lithium fluoride nanofibers-woven interlayer enables uniform lithium deposition for lithium-metal batteries

The uncontrollable formation of Li dendrites has become the biggest obstacle to the practical application of Li-metal anodes in high-energy rechargeable Li batteries. Herein, a unique LiF interlayer woven by millimeter-level, single-crystal and serrated LiF nanofibers (NFs) was designed to enable dendrite-free and highly efficient Li-metal deposition. This high-conductivity LiF interlayer can increase the Li⁺ transference number and induce the formation of ‘LiF–NFs-rich’ solid–electrolyte interface (SEI). In the ‘LiF–NFs-rich’ SEI, the ultra-long LiF nanofibers provide a continuously interfacial Li⁺ transport path. Moreover, the formed Li–LiF interface between Li-metal and SEI film renders low Li nucleation and high Li⁺ migration energy barriers, leading to uniform Li plating and stripping processes. As a result, steady charge–discharge in a Li//Li symmetrical cell for 1600 h under 4 mAh cm⁻² and 400 stable cycles under a high area capacity of 5.65 mAh cm⁻² in a high-loading Li//rGO–S cell at 17.9 mA cm⁻² could be achieved. The free-standing LiF–NFs interlayer exhibits superior advantages for commercial Li batteries and displays significant potential for expanding the applications in solid Li batteries.     

休闲潜水安全研究

运用文献资料法、现场观察法、经验总结法等方法对休闲潜水安全事故的原因进行分析.提出休闲潜水安全的对策:出发前的安全对策、下水前的安全对策、潜水时的安全对策、潜水后的安全对策.同时提出意外事故处理应注意的几个方面:潜水安全救护、事故处理流程、休闲潜水意外事故事后法律处理.