Reaction environment self-modification on low-coordination Ni2+ octahedra atomic interface for superior electrocatalytic overall water splitting

Large scale synthesis of high-efficiency bifunctional electrocatalyst based on cost-effective and earth-abundant transition metal for overall water splitting in the alkaline environment is indispensable for renewable energy conversion. In this regard, meticulous design of active sites and probing their catalytic mechanism on both cathode and anode with different reaction environment at molecular-scale are vitally necessary. Herein, a coordination environment inheriting strategy is presented for designing low-coordination Ni²⁺ octahedra (L-Ni-8) atomic interface at a high concentration (4.6 at.%). Advanced spectroscopic techniques and theoretical calculations reveal that the self-matching electron delocalization and localization state at L-Ni-8 atomic interface enable an ideal reaction environment at both cathode and anode. To improve the efficiency of using the self-modification reaction environment at L-Ni-8, all of the structural features, including high atom economy, mass transfer, and electron transfer, are integrated together from atomic-scale to macro-scale. At high current density of 500 mA/cm², the samples synthesized at gram-scale can deliver low hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) overpotentials of 262 and 348 mV, respectively.

     

Anchoring DTPA grafted PEI onto carboxylated graphene oxide to effectively remove both heavy metal ions and dyes from wastewater with robust stability

Highly efficient adsorbents, which can effectively remove both metal ions and dyes from wastewater with robust stability, are strongly required for the remediation of current polluted aqueous system, but still a challenge to be realized. Herein, a new adsorbent has been designed to solve this problem by anchoring diethylene triamine pentaacetic acid (DTPA) grafted polyethyleneimine (PEI) onto carboxylated GO (GOC-g-PD). Given the amino and carboxyl active groups from PEI and GOC/DTPA, our GOC-g-PD displays good adsorption capacity against not only inorganic metal ions (Cu²⁺ and Pb²⁺) but also organic dye (methylene blue: MB). The maximum adsorption capacity of GOC-g-PD for Cu²⁺, Pb²⁺ and MB reached 309.60 mg·g^?1, 316.17 mg·g^?1 and 262.10 mg·g^?1, respectively. Furthermore, our GOC-g-PD also exhibits good cycling stability and chemical stability against wide pH values. These outstanding properties revealed our GOC-g-PD held great potential in purifying the sewage discharged from industries.

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石膏矿山顶板破坏机理探讨

近几年来，国内的石膏矿山中，大规模采空区顶板冒落事故频繁发生。目前，对于石膏矿山大规模顶板冒落发生机理研究的还很少。根据近几年对石膏矿山的现场调查，结合岩体力学的相关理论和数值模拟技术，得出石膏矿采场顶板冒落及大规模采空区顶板冒落主要是由于石膏矿柱流变特性使其强度变低及随着采区的扩大，石膏矿柱应力增大等而引起的。     

锚杆支护回采巷道围岩类型的最优模糊识别

针对锚杆支护特点，提出了适合于锚杆支护回采巷道分类的指标，并通过构造拉格朗日函数的方法，建立了最优模糊识别的模型，实例表明，用该方法所识别的围岩与实际符合较好，具有较高的应用价值。     

基桩低应变测试数值实验研究

根据动力学基本原理，利用ANSYS有限元程序模拟低应变测试基桩几种典型缺陷的位移时域曲线和速度时域曲线，并据此判断基桩质量取得了良好的效果。     

油砂新的经济增长推进剂

加拿大拥有丰富的油砂资源，在全球油砂石油开发生产方面居于主导地位。随着油砂石油开发生产技术水平的不断提高，油砂石油已经成为加拿大经济发展计划中的一项重要组成部分。油砂石油对美国以及世界经济增长的推动作用已经不可忽视。     

日本东京六本木大厦多媒体信息显示系统松下"NMstage"信息传输、播放解决方案

六本木建筑群于2003年4月25日盛大开幕。森茂株式会社将其作为东京文化的核心，为创造出具有日本代表性的文化都市，前后17年总共投入了约2，800亿日元，开发出此综合性商业设施。六本木建筑群占地面积约达11．6万ha，其中以六本木建筑群的主塔森茂塔（地上54层，高238m）为中心，含有超过200家的国际化酒店、电视台、医护设施、综合电影院、美术馆、公寓、高级专卖店、西餐厅、银行、邮局等商业设施。     

一种新的滑坡可视化方法

首次提出了免标定扩充现实技术在滑坡可视化中的应用，论证了基于仿射表示的免标定扩充现实方法及其对滑坡可视化应用的可行性。与传统虚拟现实相比，它具有更强的真实性，大大提高了仿真效率。     

What can be taught in architectural design? — <Emphasis Type="Italic">parti,poché</Emphasis>, and felt qualities

This essay begins with a reflection on what has been taught in architectural design since the turn of the twentieth century. I shall trace back to the two disciplinary foundations of the French École des Beaux-Arts — parti and poché — in the education of an architect in the eighteenth and nineteenth centuries. I shall then attempt to superimpose parti and poché on a modern disciplinary framework, say that of mathematics, which leads to musings on a series of architectural problems that include pattern versus type, stability versus mobility, orthogonal versus oblique, confinement versus transparency, and aging versus metallic sheen. These paradoxes, I suggest, demand the education of an architect to address both the instrumental pattern of a building configuration and the ambient felt qualities of a room, rather than vision alone.     

浅谈小城市特色的形成——以沂源县城为例

改革开放以来,城乡经济发展迅速,城市无论在数量上还是规模上的快速发展出人意料,建设活动也最具活力。但同时,我们也清醒地看到,大多数小城市千城一面,杂乱无章,毫无特色可言。就像一支曲子,没有自己的主旋律,让人惋惜。沂源县城作为一个新建城市,不失时机地作好城市特色规划,更好地指导城市的开发和建设,就显得十分重要了。在2002年7月批复实施的县城总体规划中,将沂源县城城市性质定义为“山水生态城市”。那么沂源县城有怎样的现实条件、如何才能达到这一目标呢?一、沂源县城市要素浅析城市的特色是指城市所在地域特有的自然风光与人工…