Deposit modeling and resource estimation of stratiform massive sulphide deposits in Canada

The frequency distributions of grades and tonnages of Cu, Pb, Zn, Ag, and Au in Canadian stratiform massive sulphide deposits can be approximated by lognormal distributions. Lack of significant statistical correlation between grade and tonnage in the discovered economic deposits suggests statistical independence between these two variables. Grade-tonnage curves exhibit several forms that include exponential relationships. The curves may characterize specific geological environments containing specific mineral deposits, and may be used to estimate the subeconomic resources in the environment.     

面向可循环经济的物联网技术应用研究

基于可循环经济理论,利用物联网技术,以汽车为例,结合汽车产品的全生命周期中各个环节的特点,建立了一套完整的智能生产、消费、回收系统,提出了一种全新的基于物联网技术下可循环经济模式,有效地解决了可循环经济中产品回收循环困难的问题,并对物联网技术在生产、消费、回收环节中的具体技术应用进行了深入研究。     

适合生态涵养区农业发展的林下经济模式*——以北京市怀柔区为例

山区是首都的生态涵养区,在落实首都山区生态功能定位的同时,促进山区经济发展是当前面临的重要任务。以怀柔区为例,在阐述林下经济内涵的基础上,对生态涵养区发展林下经济进行了条件分析,论述了适合生态涵养区发展的两种林下经济模式,即林菌模式和林禽模式,并对发展林下经济提出了一些建议。     

基于区间数的城市配电网经济运行模糊综合评价

针对配电网经济运行评价的多维多层次和不确定性,提出一种基于区间数的城市配电网经济运行模糊综合评价方法。利用区间层次分析法计算指标权重,合理处理了专家判断的不确定性,同时为了避免综合得分区间数发散的问题,引入区间数可能度的概念对单因素的综合权重进行修正;考虑到不同地区配电网的差异,采用区间梯形隶属度函数,同时定义了区间数中心对单因素的区间隶属度进行修正,避免了单因素得分区间数的发散;最后运用区间数符合度的概念,并依据评价等级标准区间数,确定综合得分区间数的评价等级。实例分析验证了该评价方法的可行性。     

Liquid hydrogen,methylcyclohexane, and ammonia as potential hydrogen storage: Comparison review

Among the several candidates of hydrogen (H₂) storage, liquid H₂, methylcyclohexane (MCH), and ammonia (NH₃) are considered as potential hydrogen carriers, especially in Japan, in terms of their characteristics, application feasibility, and economic performance. In addition, as the main mover in the introduction of H₂, Japan has focused on the storage of H₂, which can be categorized into these three methods. Each of them has advantages and disadvantages compared to the other. Liquid H₂ faces challenges in the huge energy consumption that occurs during liquefaction and in the loss of H₂ through boil-off during storage. MCH has its main obstacles in requiring a large amount of energy in dehydrogenation. Finally, NH₃ encounters high energy demand in both synthesis and decomposition (if required). In terms of energy efficiency, NH₃ is predicted to have the highest total energy efficiency, followed by liquid H₂, and MCH. In addition, from the calculation of cost, NH₃ with direct utilization (without decomposition) is considered to have the highest feasibility for massive adoption, as it shows the lowest cost (20–22 JPY·Nm³-H₂ in 2050), which is close to the government target of H₂ cost (20 JPY·Nm³-H₂ in 2050). However, in the case that highly pure H₂ (such as for fuel cell) is needed, liquid H₂ looks to be promising (24–25 JPY·Nm³-H₂ in 2050), compared with MCH and NH₃ with decomposition and purification.     

Cybersecurity through the lens of Digital Identity and Data Protection: Issues and Trends

The use of a secure and robust digital identification system that is capable of protecting privacy is an essential, reliable and user-friendly element for a strong cyber resilience strategy and is a source of new business opportunities and applications for banks, private sector with a return on their investment.The march towards Digital Identity is well underway therefore, focus should be on both adoption and adaption of the new structures and regulations. These are needed to govern the associated services and transactions as well as establishing laws that enforce penalties for violations.There is no doubt then that more and more entities and institutions would move to the cloud. Security challenges affecting the cloud may not be new but the mode of addressing them would be different. The authors develop a Data Colouring technique for securing data processed or stored on both cloud and non-cloud platforms. The technique combines Public Key Infrastructure (PKI), concatenated fingerprints and digital watermarking. Using this technique, data can be secured at creation or during storage and remains secure during processing.     

图书馆的外部性及其服务经济的职能作用——以行业特色高校图书馆为例

图书馆的外部性主要表现在它所具有的准公共产品、低边际成本和公益性三个方面,这三种表现形式使得图书馆社会化服务成为其重要的职能,在社会化服务中为地方经济或行业经济发展服务是其重要内容之一。本文以行业特色高校图书馆为例,说明这类图书馆在为行业经济服务中具有优势和可行性,同时服务行业经济也有利于图书馆自身的生存和发展。对于如何发挥图书馆外部性,更好的服务行业经济,提出了一些对策建议。     

低碳经济背景下的饭店营销策略研究

由温室气体排放所引起的全球气候变暖问题引起了国际社会的广泛关注,关于发展权和排放权的讨论不断升级,催生了低碳经济的理念。饭店作为自然资源和能源高消耗的场所,发展低碳经济是饭店实现可持续发展的必然选择。文章主要分析了饭店走低碳经济之路的重要性,并提出了几点绿色营销策略。     

南昌市县域经济发展水平比较分析

县域经济是国民经济的重要组成部分,是南昌市经济发展的重要增长极,发展壮大县域经济,对于落实科学发展观,统筹城乡区域协调发展,全面建设小康社会,加速南昌进位赶超具有重要意义。近年来,南昌市县域经济发展取得了令人瞩目的巨大成就,然而与中部百强县、全国百强县相比,仍有较大的差距,发展水平有待进一步提高。     

低碳经济视角下低碳旅游实现方式研究

低碳经济的发展带动了一系列相关产业的发展,特别是对于飞速发展的旅游业来说,发展低碳旅游成为时代发展的诉求。文章介绍了低碳经济背景下的低碳旅游,以及低碳旅游在现实中的实现方式,阐述了低碳旅游的发展与生态旅游之间的和谐关系。旨在引导人们充分认识低碳旅游时代的来临,指导人们应用科学合理的旅游方式,开展旅游活动,为旅游业的可持续发展提供理论支持。