前驱体结构对多环芳烃选择性开环Pt/Beta催化剂的影响

以海绵铂为原料合成出［Pt（NH₃）₆］Cl₄络合物,采用热重分析（TG）、扫描电镜-能谱（SEM-EDS）、紫外-可见分光光度计（UV-Vis）、质谱（MS）、X射线光电子能谱（XPS）等手段确定了［Pt（NH₃）₆］Cl₄的结构组成;以H₂PtCl₆、Pt（NH₃）₄Cl₂和［Pt（NH₃）₆］Cl₄为前驱体,采用等体积浸渍法制得Pt/Beta催化剂,采用X射线衍射（XRD）、X射线荧光光谱（XRF）、氨程序升温脱附（NH₃-TPD）、氢氧滴定（H₂-O₂）、透射电镜（TEM）、氢气程序升温脱附（H₂-TPD）等表征了Pt/Beta催化剂的物化性质,并考察了Pt/Beta催化剂的多环芳烃选择性开环性能。结果表明,［Pt（NH₃）₆］Cl₄络合物具有更高的“抗自还原”能力,可从前驱体结构上降低铂氨前驱体受热分解时的自还原现象。前驱体结构对铂纳米颗粒的几何尺寸及分布有较大影响,一方面络合物的价态显著影响前驱体与分子筛间的静电作用,进而影响铂纳米颗粒的落位与尺寸;另一方面络合物的空间结构影响前驱体在分子筛微孔中的分布,影响铂纳米颗粒的Ostwald熟化速率。前驱体结构可调变Pt/Beta催化剂的双功能匹配关系,显著影响Pt/Beta催化剂转化甲基萘的活性、稳定性,采用［Pt（NH₃）₆］Cl₄前驱体制备的Pt/Beta催化剂具有更优的活性及长周期稳定性。     

仿生自愈合水泥砂浆的研究

将含有聚氨酯、丙烯酸酯等修复剂材料的空心玻璃纤维埋入水泥砂浆基体中，在水泥砂浆内部形成智能型仿生自愈合系统，砂浆开裂后空心玻璃纤维断裂，致使修复剂流入基体，愈合基体微裂缝且修复损伤界面，使用INSTRON实验机和声发射仪分别测试了砂浆愈合后的强度和质量，结果表明：砂浆的愈合效果明显，且断裂韧性得到了一定的改善。     

国内外混凝土的收缩性能试验研究方法

着重对国内外获得普遍认同的混凝土各种收缩性变形的机理及试验研究方法进行了总结和综述，对解决混凝土的收缩裂缝具有重要的意义。     

The house as an expression of social worlds: Irbid's elite and their architecture

This paper shows howarchitecture can be explained through the ideaof the Social World. The social world isan abstract concept defined as a cultural area,the boundaries of which are defined by thelimit of effective communication. Within thesocial world there are special norms and valuesand a common outlook towards life. Itencompasses factors like identity, culture,social communication and economic and politicalconditions without being limited to one singlefactor. The paper establishes a link betweenthe contemporary villas of Irbid, the secondlargest city in Jordan, and the social worldsof their inhabitants. The paper focuses onIrbid's University District (UD)differentiating between two groups of socialworlds, the old elite and the new elite. Itshows how the meaning of the house is differentamong the two groups. While the villa among theold elite is treated as a functional object forliving, it is now dealt with as a statusobject – an object for displaying theself – among the new elite.     

三维岩体构造网络生成的自协调法及工程应用

岩体构造决定岩体的力学性质，工程上以岩体构造作为分析岩体的基本依据，故岩体构造的生成是很重要的环节。依靠实测的二维网络推算三维网络，亦即使用自协调法校核生成网络的正确性，使用计算机勘探模拟法校验岩体网络的正确性，本方法已应用于国内外不少工程。     

含分布式电源的配电网的供电恢复技术研究综述

本文总结了含DG的配电网的供电恢复的国内外研究现状,分别从DG对配电网供电恢复起到的作用、含DG的配电网的网络描述方法以及网络简化方法、含DG的配电网供电恢复的策略、含DG的配电网供电恢复问题的数学建模与优化求解方法、含DG的配电网供电恢复的控制方式以及时变情况下含DG的配电网供电恢复等多个方面进行论述。在概述含DG的配电网的供电恢复的研究现状的基础上,展望了下一步值得继续研究的问题和方向。     

基于PIC16F877单片机的加热炉模糊控制系统设计与研究

针对热处理加热炉具有大惯性、纯滞后等非线性时变的特点,基于精确数学模型的常规PID控制难以保证加热工艺要求。设计一种基于PIC16F877单片机的加热炉模糊控制系统,具有数据采集、炉温控制以及故障监测等功能,采用规则自寻优的控制算法进行过程控制,对该算法进行了深入的研究,从而实现了对整个加热过程的全自动智能控制。以某加热炉为对象用MATLAB进行了仿真,结果表明该系统控制精度高,超调量小,鲁棒性强,对工业加热炉的控制具有一定的推广价值。     

基于传热模拟分析的自保温外墙热桥节能构造的优化研究

针对居住建筑的外墙自保温体系,采用数值方法对墙体保温性能进行模拟计算,分析了热桥部位的不同节能构造对外墙平均传热系数的影响,从而发现了热桥影响外墙保温性能的关键因素,并在此基础上进一步对热桥部位的节能构造进行研究和优化。结果表明:热桥部位采取合理的保温措施和节能构造的优化,能有效降低外墙的平均传热系数,改善外墙保温性能,这为改善和提高当前自保温外墙系统的整体节能性能和安全性能提供了有效的参考方案。     

Coverage‐aware connectivity‐constrained unattended sensor deployment in underwater acoustic sensor networks

Careful deployment of nodes in underwater acoustic sensor networks in a distributed manner with the goal of maximized coverage and guaranteed connectivity is a challenging problem because it is very difficult and costly to access the 3D underwater environment. This paper presents a novel algorithm for self‐deployment of nodes in underwater acoustic sensor networks assuming that the nodes are randomly dropped to the water surface and form a densely populated connected network at the water surface. The idea of the algorithm is based on calculating an optimized depth for each node in the network in such a way that the possible sensing coverage overlaps are minimized and the connectivity of final topology is guaranteed. The algorithm has three main phases. In the first phase, nodes are organized in a tree structure that is rooted at the surface station. In the second phase, the depths for all nodes are computed iteratively at surface station. In the final phase, the calculated depths are distributed to nodes so that the nodes start sinking. The performance of the proposed approach is validated through simulation. We observed that the proposed approach performs at least 10% better in terms of network coverage than contemporary schemes in the literature. Copyright © 2016 John Wiley & Sons, Ltd.