风景区及其边缘城镇统筹发展研究——以重庆统景为例

立足资源、面向市场、强化差异性竞争成为中国西部城镇重要发展途径.风景区边缘城镇由于毗邻稀缺的风景名胜资源的区位优势,迫切希望依托风景区带动地方全面发展,事实上却存在开发与保护冲突、景镇建设脱节的现象,其核心矛盾在于景区与城镇定位不明、资源配置不利、产业发展脱节.基于可持续发展理念提出景镇统筹发展思路,其核心包括生态环境保护优先、产业经济统筹发展、空间景观整体塑造、社会生活和谐共荣.最后以重庆统景规划为例,构建以空间、风貌、旅游、地产四大板块为基础的景镇统筹发展整体框架,实现生态安全保障、经济高度发展、三大效益高度统一的发展目标.     

谈建筑设计中的外部尺度

从建筑美学的角度,通过对高层建筑的讨论和质疑,提出建筑外部尺度处理的美学原则。建筑是人类历史文化的载体,任何时代,建筑都以其感人的形象展现出它的风貌,表达着它所包容的各种信息和内涵。     

苏通大桥主桥基础工程GPS-RTK技术施工测量方案与实施

苏通长江公路大桥在世界上首次成功地将GPS-RTK技术应用于特大型桥梁的施工测量工作。本文简述了苏通大桥主桥工程施工测量采用GPS-RTK技术的必要性;分析了GPS-RTK测量系统在苏通大桥跨江区域的测量精度;介绍了南主塔墩基础工程4个应用GPS-RTK技术的施工测量方案。     

加快城市化进程的对策——以江苏无锡市惠山区为例

城市化是经济和社会发展的高度集合,是工业化、国际化和现代化水平的综合标志。改革开放特别是近十年来,江苏无锡市惠山区积极实施城乡一体化战略,城市化进程明显加快,城镇建成区普遍达到相当规模,城镇综合实力明显增强,并涌现了一批经济充满活力的重点城镇。同时也应该看到,相对惠山区经济发展总体水平而言,城市化仍然滞后。其突出问题和矛盾:一是城市化水平落后于工业化进程;二是城镇结构不完善,规模     

Enhanced sound absorption properties of porous ceramics modified by graphene oxide films

Under the condition of constant thickness, improving the low-frequency sound absorption performance of conventional sound-absorbing materials is a challenging research topic. To address this issue, a new reduced graphene oxide/polyvinyl alcohol (RGO/PVA) porous composite ceramic was fabricated using freeze-drying and optimized by redesigning the internal connecting pores of porous ceramic matrixes with a reticular microstructure using RGO and PVA. The as-prepared porous structure showed significant enhancement in the low-frequency sound absorption band compared with pristine porous ceramics. In addition, the hybrid porous ceramics exhibited low thermal conductivity. These favorable properties indicate that the hybrid sound-absorbing ceramics have potential application prospects for noise reduction in the fields of construction and electrical and mechanical devices.     

A physical strategy for the preparation of isotactic polypropylene spheres with microsphere and bead–string spherulite morphologies

This study mainly focuses on the formation of isotactic polypropylene (iPP) blend morphologies with microspheres and distinct bead–string spherulites. iPP microspheres have been prepared by a simple and convenient strategy through either an isothermal or a nonisothermal crystallization process based on the macrophase‐separated structure in molten state of iPP/olefin block copolymer (OBC) blend. The dimension of the iPP spheres can be adjusted easily from about 1 µm to >10 µm by controlling the compatibility and annealing conditions. It was found that any of the following three parameters, the molecular structure of OBC (particularly the octene content), molecular weight of iPP, and annealing condition can be rescaled with others in controlling the dimension of the iPP microspheres. The mechanism of the formation of iPP microspheres was studied in detail. Surprisingly, the typical spinodal decomposition morphology with interconnected or thin sheet structure is the precursor of these microspheres. During the subsequent annealing process, it breaks up and further coarsens into spherical structure. In addition, distinct spherulites with a bead–string substructure have been obtained during the isothermal crystallization. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40863.     

Enantioselective One‐Pot Reaction: Organocatalyzed Synthesis of Fully Functionalized Oxabicyclo[2.2.2]octanes with Seven Contiguous Stereocenters

An enantioselective one‐pot Michael/Michael/Henry/hemiacetalization reaction between α,β‐unsaturated aldehydes, α‐ketoamides, and nitroalkenes under mild conditions catalyzed by a diarylprolinol silyl ether has been developed. The sequential methodology provides a direct approach to a wide range of fully substituted chiral oxabicyclo[2.2.2]octanes with seven contiguous stereocenters in moderate to excellent yields (up to 99%), high to excellent diastereoselectivities (up to >25:1 dr), and high to excellent enantioselectivities (up to 99% ee).

     

主螺栓断裂对压力容器密封性能、应力及疲劳的影响分析

在理论分析和数值仿真技术基础上,研究并提出了一种主螺栓断裂对反应堆压力容器(RPV)密封性能、螺栓应力及疲劳的影响分析方法,采用该方法对主螺栓断裂影响进行了评价分析。结果表明,该方法适用于分析1根或多根主螺栓断裂情况对压力容器安全性能的影响,可以用于核电厂在运行中发生类似问题时判断反应堆能否继续运行。     

HBT60混凝土输送泵改进

由于操作司机技术不熟练,保养不够,且HBT60泵设计中也存在缺陷,造成故障,影响生产,找出该泵故障原因,进行改进修复,并对操作司机提出操作保养要求。     

塔河油田碳酸盐岩油藏注气开发实践及选井认识

塔河油田碳酸盐岩油藏具有储集体埋藏深、非均质性强、储集空间变化大的特征,储集体类型以缝洞型油藏为主。随着油田的开发,能量和底水问题逐渐成为影响自然递减的主要因素。在水驱采油能力大幅下降的同时,注气提高采收率成为油田开发的重要手段。该文介绍在塔河油田注气过程中通过实践摸索,针对不同类型油藏注气开发的经验及规律,在注气选井原则提出新的认识,为碳酸盐油藏提高气驱效率、指导注气开发拓宽思路和方法。