城市连接键

该文以城市连接键的切入点论述建筑与城市的衔接关系,具体分析了国内部分优秀案例,抽象出五项设计策略：衔接城市路径、尊重城市肌理、协调城市尺度、整合城市界面和重构空间序列,并尝试将设计策略运用于包头赛力特尔城的概念方案中。最后,文章总结了城市连接键的研究意义。     

某型无人靶机飞行航路规划设计及领航

通过对某型无人靶机的飞行特性进行分析，研究靶机自主导航设计原理，对该型靶机的飞行航路和自主导航装订航线进行规划设计；结合多次供靶实际，研究分析该型靶机空中易出现的特殊情况，并提出可行的处置措施。     

乙二醇生产技术与市场分析

介绍了乙二醇生产技术路线和近期技术发展动态,并通过对乙二醇市场供需的分析和预测,以及对进出口、价格走势的剖析,提出了我国乙二醇生产的发展建议和思路。     

BiFeO3 films on steel substrate by the citrate method

We deposited BiFeO₃ films on stainless steel substrates using a simple low-temperature wet-chemical route. Bismuth and iron nitrates were used as metal source and citric acid as chelating agent to prepare a water solution and deposit the film by dipping the steel substrate in the viscous solution. We have investigated the composition, crystallinity and structure of the BiFeO₃ film on steel by X-ray diffraction, X-ray photoelectron spectroscopy, high resolution scanning electron microscopy, conventional and high resolution transmission electron microscopy, and energy dispersive spectroscopy techniques. The film deposited on the steel substrate has two sublayers: a very thin (about 100 nm) nanocrystalline layer, with crystallite size of few nanometers, and a thicker (below 1 μm) crystalline layer.     

Facile template-free route to poly(N-methylaniline) microspheres in aqueous solution

Poly(N-methylaniline) microspheres (PNMA) with the diameters of 1.2–1.8 μm were successfully synthesized by a facile template-free method in aqueous solution. The structure of the as-prepared PNMA microspheres was studied by FTIR spectra. A possible mechanism was proposed to interpret the formation of PNMA microspheres. It was found that the formation and template effect of the NMA spheres were responsible for the formation of PNMA microspheres.     

复线桥的巷道效应分析

针对两桥和三桥构成的复线桥,利用数学模型计算了不同桥间距和不同斜流交角情况下复线桥的水流流场,得到修建复线桥后通航净宽的减小值,提出计算净宽减小值的公式。结果表明桥洞长度及桥轴线法向与水流方向的夹角是影响巷道效应的主要因素。     

第三层交换——IP交换技术的研究

讨论了第三层交换－ＩＰ交换的关键技术，分析比较了几种不同的ＩＰ交换技术，并指出了所存在的问题。     

Online algorithms for searching and exploration in the plane

In this paper, we survey online algorithms in computational geometry that have been designed for mobile robots for searching a target and for exploring a region in the plane.     

施工企业BIM应用技术路线分析

施工企业目前正在进行的BIM应用和20年前的CAD应用相比面临两个显著不同的挑战,一是需要使用和可以选择的BIM软件种类和数量是当时的数倍,二是CAD主要考虑图形共享,而BIM对不同软件之间的数据共享要求大大提高,因此选择合适的技术路线就成了施工企业BIM应用投入产出效益高低甚至成败的关键。在介绍BIM技术路线选择的方法、流程、技术影响因素和非技术影响因素的基础上,通过对几种可能技术路线的分析,提出了施工企业BIM技术路线在BIM应用不同成熟阶段的发展走向。     

高层建筑施工塔吊设计及其对主结构的影响

介绍高层施工塔吊的支撑架设计以及塔吊在台风作用下对主体结构的影响。通过施工模拟仿真分析得出,悬挑支撑架竖向设置拉压杆可以有效地传递塔吊的支座反力,在塔吊支撑架处于最不利工况时仍能满足强度和变形要求,水平连系杆的设置可以有效保证支撑架的侧向稳定:塔吊的支座反力对主体铜结构的影响很大,特别是当风荷载方向与塔吊呈45°时,主结构杆件的应力会急剧提高,因此,需提高该区域的框架粱、柱截面或材料强度。