Functional Composite Adsorbents Based on Metal-Organic Frameworks in a Carbon Matrix Applied for Methane Storage

Protection of Metals and Physical Chemistry of Surfaces - In the present work, a method for producing new shaped composite materials by introducing a metal-organic framework structure Cu-BTC110...     

构建煤矿职业安全卫生管理体系的探讨

煤炭企业引入职业安全卫生管理体系，将使煤炭企业由被动管理向主动管理转变，经验管理向科学管理转变。本文结合煤炭企业的特点，提出了煤炭企业建立职业安全卫生管理体系的具体可行方法。     

微机在地表移动与变形中的应用

介绍了如何使用微机对矩形工作面开采时地表任意点移动和变形值的计算.     

Functional mesoporous poly(ionic liquid)-based copolymer monoliths: From synthesis to catalysis and microporous carbon production

Ionic liquid-functionalized mesoporous polymeric networks with specific surface area up to 935 m²/g have been successfully synthesized one pot by solvothermal copolymerization of divinylbenzene and monomeric ionic liquids. The as-obtained polymers exhibit a monolithic structure featuring large pore volumes, an abundant mesoporosity and an adjustable content of ionic liquids. The effect of the reaction conditions on the pore structure has been studied in detail. These poly(ionic liquid)-based porous networks (PILPNs) have then been employed as precursors in two distinct applications, namely organocatalysis and production of microporous carbon monoliths. Selected organocatalyzed reactions, including carbonatation of propylene oxide by cycloaddition with carbon dioxide, benzoin condensation, and cyanosilylation of benzaldehyde have been readily triggered by PILPNs acting as crosslinked polymer-supported (pre)catalysts. The two latter reactions required the prior deprotonation of the imidazolium salt units with a strong base to successfully generate polymer-supported N-heterocyclic carbenes, referred to as poly(NHC)s. Facile recycling and reuse of polymer-supported (pre)catalysts was achieved by simple filtration owing to the heterogeneous reaction conditions. Furthermore, PILPNs could be easily converted into microporous carbon monoliths via CO₂ activation.     

钯催化Suzuki偶联反应的研究进展

金属Pd催化的Suzuki偶联反应是碳-碳偶联反应中重要的反应之一。综述了近年来Pd催化Suzuki偶联反应的研究进展,其中包括Suzuki反应机理、配体种类及其在有机合成中的应用。介绍了含N、P配体的钯催化剂和碳纳米管、磁性材料、多孔材料、水滑石、金属氧化物、高分子材料等负载的无配体钯催化剂的研究进展。     

21世纪前期我国煤炭工业研究的新领域探讨

摘要：根据文献[1]的内容,对21世纪前期我国煤炭工业应研究开拓的新领域进行了探讨．对于高瓦斯含量煤层,提出了采用不通风稀释瓦斯、增加空气中瓦斯含量的防治瓦斯灾害的机理、需研究的课题及待开发的技术,为解决高瓦斯矿井防治瓦斯灾害提出一条新的思路．提出煤炭工业与环境和谐发展的思路,把开采后废矿井（开采形成的地下空间）的用途作为最后目标,在环保与开采协调的设计思想指导下,研发新的开拓、开采理论和技术,作为本世纪前期我国煤炭工业科研新领域．     

多小区OFDMA系统的分布式资源分配方案

该文研究了多小区OFDMA系统中下行链路的资源分配问题,主要考虑同信道干扰和频率选择性衰落对资源分配的影响,提出一种基于基站的分布式分配方案,同时考虑用户的服务质量要求(QoS)及公平性,完成子载波和功率的联合分配。算法只要求基站间简单的子载波使用计数的信息交换,不会给系统带来很大的信令负载。仿真表明,通过调整参数,该算法可以取得不同性能间的折衷。     

基于数字水印的形状错误隐藏

MPEG-4编码是一种基于对象内容的第二代视频编码方案,将视频根据内容分割成前景对象和背景.视频对象的信息分为形状信息、纹理信息和运动信息,而形状信息是正确解码视频对象的基础.本文针对MPEG-4编码标准中Ⅰ-VOP形状信息的错误进行错误隐藏,有别于传统的曲线插值方法,采用基于鲁棒盲水印的新算法,主要将形状信息作为水印信息进行Arnold置乱变换后嵌入到背景区域中.实验证明,本文提出的方法对于形状信息严重丢失的修复效果较好.     

电动汽车变速器电液控制系统总成设计及结构优化

双离合变速器(dual clutch transmission,DCT)具有换挡速度快、传动效率高和质量小等优点,搭载DCT的电动汽车的动力性与经济性可显著提高.在DCT中,电液控制系统总成的设计尤为关键.以纯电动汽车的两挡干式双离合变速器(简称为2DCT)为研究对象,对其电液控制系统总成进行设计.首先,基于2DCT中...     

Channel Measurement and Path Loss Modeling from 220 GHz to 330 GHz for 6G Wireless Communications

Terahertz (THz) communication has been envisioned as a key enabling technology for sixthgeneration (6G).In this paper,we present an extensive THz channel measur...