新阶段北京城市空间布局的战略思考

系统回顾了历版北京城市总体规划的空间布局特征,从功能体系、空间结构、空间形态、区域协同4个方面分析了当前城市空间发展面临的问题和成因,提出了"四个中心"谋保障、"一核一主一副、两轴多点一区"立结构、"一屏、三环、五河、九楔"塑形态、"一核两翼、四个跨界城市组团"促协同的城市空间布局优化的战略措施。     

蒸馏塔的分散化控制

本文在不同的分散化信息结构下,对一个二元蒸馏塔分别给出了静态分散化和一阶动态 分散化干扰解耦控制器的设计.结果表明,反馈后蒸馏塔的产品输出完全不受干扰量进料组 分的影响.     

On the concept of decentralization/centralization and its consequences for the design of production management systems

Decentralization and centralization are fundamental principles of organizational structuring. Work distribution and coordination can only be balanced by simultaneous centralization and decentralization. A distinct relation exists between decentralization and integration, the latter being the result of differentiation of integrational fields as part of a data processing subsystem.     

P2P及其在企业计算中的应用

1 引言简单地说,P2P应用是由物理上分布的节点组成,以协作完成某些任务;这些节点被称为对等实体(peer),对等意味着这些实体在执行计算、提供和消费服务时分担相同的责任。这与传统的客户/服务器模式不同。客户/服务器模式中利用少量的服务器来处理潜在的可能的大量客户的服务请求,因此系统中的实体有明确的角色划分。     

关于智能优化方法的集聚性与弥散性问题

在简要叙述智能优化方法中机制产生的原理和方式的基础上，引入了智能优化算法所应具有的2种基本属性——集聚性和弥散性，描述了二者与算法收敛性的关系，指出了二者对于分析和构造算法的重要性，并结合实例进行了分析．最后根据算法的集聚性与弥散性，从算法群体进化角度研究了算法中的机制融合方法并结合实例进行了说明．     

Research on key technology of blockchain privacy protection and scalability

The blockchain has typical features such as decentralization of accounts, data irrevocability and transparency of information, which solves to a certain extent the collaboration and value flow between individuals who do not trust each other. However, the public verifiability of the blockchain poses security challenges for user privacy, while its performance issues, especially in terms of transaction throughput and scalability, also limit further development of blockchain technology. This paper researches and discusses the two major aspects of blockchain privacy protection and scaling technologies. First, it outlines the Bitcoin and ETH technologies in the blockchain and the comparison between them; then, it introduces several typical blockchain-oriented key technologies and development status of privacy protection such as ring signature, zero knowledge proof, secure multi-party computing, homomorphic commitment and subvector commitment. Similarly, the key technologies and case studies of blockchain scale-up are introduced from both up and down the chain to break through the two major bottlenecks in the development of blockchain privacy protection and scalability, so that the blockchain has a smart contract function, under the premise of protecting user privacy with high transaction throughput and scalability, to meet the actual needs of a wide range of fields such as finance, education, social management and industrial logistics, is the future direction of development of the blockchain.     

Are local public services better delivered in more autonomous regions? Evidence from European regions using a dose‐response approach

Does regional autonomy lead to better local public services? We investigate this issue using measures of public service performance and autonomy at the region level in 171 European regions. We introduce a novel dose‐response approach which identifies the pattern of the effect of regional autonomy on the performance of public services. The relationship between the level of regional autonomy and the provision of local public services exhibits a u‐shape: both low and high autonomy lead to better local public services. This speaks against the presence of one optimal level of autonomy and policy recommendations based on the view that more decentralisation is always desirable. It shows that different institutional settings can be economically viable and efficient.     

能源系统中的区块链:概念、应用与展望

互联网作为第三次工业革命的代表性技术改变了现代社会的生活方式和经济发展模式,而以去中心化和信任机制为主要特征的区块链技术作为新一代互联网技术的重要组成部分,很有可能推动现有计算模式的变革,在金融、能源等诸多领域将产生广泛而深远的影响。首先对区块链进行了概述,给出了区块链的定义和技术框架,阐述了区块链的特点和意义;之后,介绍了区块链在一些领域的应用情况;最后,概述了区块链在能源系统领域的研究现状,并对能源区块链的研究做了展望。     

完善部、省矿业权审批权限划分研究

完善部、省矿业权审批权限划分,对推动矿业权审批简政放权、转变管理职能具有重要意义。系统梳理了部、省矿业权审批权限划分管理制度调整变化情况,总结了管理实践中好的经验做法,分析指出了存在的主要问题,在此基础上,研究提出了完善部、省矿业权审批权限划分政策建议。     

水基环氧纳米涂料的研制

超声场条件下,试验研究水基环氧涂料固化以及纳米颗粒在水基环氧树脂中的悬浮分散,研制出系列水基涂料。通过室内、室外腐蚀实验,结果表明所研制的涂料有良好的抗腐蚀性能。