Fe3O4 encapsulated mesoporous silica nanospheres with tunable size and large void pore

Magnetic Fe₃O₄ and mesoporous silica core-shell nanospheres with tunable size from 110–800 nm were synthesized via a one step self-assembly method. The morphological, structural, textural, and magnetic properties were well-characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, N₂ adsorption-desorption and magnetometer. These nanocomposites, which possess high surface area, large pore volume and well-defined pore size, exhibit two dimensional hexagonal (P6mm) mesostructures. Interestingly, magnetic core and mesoporous silica shell nanocomposites with large void pore (20 nm) on the shell were generated by increasing the ratio of ethanol/water. Additionally, the obtained nanocomposites combined magnetization response and large void pore, implying the possibility of applications in drug/gene targeting delivery. The cell internalization capacity of NH₂-functionalized nanocomposites in the case of cancer cells (HeLa cells) was exemplified to demonstrate their nano-medicine application.     

在建工程旁埋地天然气管道沉降监测实验

对在建上海中心工程项目周边的天然气埋地管道进行了沉降监测,发现在监测期间,最大的正变形量为10mm,最大的负变形量-8mm;对监测结果进行了数值拟合和误差分析。     

浅析基于体块的建筑造型设计手法--以卒姆托的瓦尔斯温泉浴场为例

本文以卒姆托的瓦尔斯温泉浴场为例,同时结合笔者所做的实际建筑方案设计,对基于体块的建筑造型设计手法进行了简要地分析,为建筑造型设计提供了一定的手法依据。     

浅谈房建预应力混凝土梁体挠度检测及其必要性

本文通过对预应力混凝土梁的受力性能的探究,结合其在房建中的应用和一些相关工程实例,讨论了房建预应力混凝土梁体挠度检测及其必要性。     

青海省特殊教育类校园建筑现状分析--青海省特殊教育学校调研报告

为了推动国家特殊教育事业沿着全面、协调、可持续的方向科学发展,研究西部地区特殊教育类校园建筑的现状,笔者对青海省特殊教育学校进行了实地调研和走访,对青海省特殊教育类校园建筑现状进行分析。     

TDR水分计标定试验分析

土体含水量是控制非饱和土特性不可或缺的状态变量,快捷、准确地测量该变量成为推动非饱和土研究的重要环节。TDR水分计测定含水量具有方便、快速、经济的优点。围绕TDR测量原理,开展了探测体积、测量误差的标定试验,并在操作中总结出了TDR水分计的安装经验,结果表明:两针型TDR水分计探测范围集中在1.7倍探针间距的圆柱体内;针对砂土和黄土,TDR测量值比烘干含水量稍大,两者间可采用三次多项式拟合修正。为确保TDR水分计为实际应用提供准确可靠的水分数据,未来室内试验和室外监测使用前需预先进行标定。     

基于信号解释Petri网的污水处理系统研究

污水生化处理过程机理复杂,具有强耦合性、非线性、时变性等特征,建模控制过程比较复杂.针对SBR处理工艺过程,提出采用信号解释Petri对SBR污水处理进行建模与控制,对系统活性、可逆性、终止性、决定性和输入依赖性进行验证,并对设计后系统的模型进行评价.分析结果表明,采用信号解释Petri对SBR污水处理进行建模与控制形式正确、有效.最后提出用PLC实现污水处理系统的设计、分析、仿真和代码产生.     

Nanoscale Investigation of Grain Growth in RF-Sputtered Indium Tin Oxide Thin Films by Scanning Probe Microscopy

This work studied the electronic characteristics of the grains and grain boundaries of indium tin oxide (ITO) thin films using electrostatic and Kelvin probe force microscopy. Two types of ITO films were compared, deposited using radiofrequency magnetron sputtering in pure argon or 99% argon + 1% oxygen, respectively. The average grain size and surface roughness increased with substrate temperature for the films deposited in pure argon. With the addition of 1% oxygen, the increase in the grain size was inhibited above 150°C, which was suggested to be due to passivation of the grains by the excess oxygen. Electrostatic force microscopy and Kelvin probe force microscopy (KPFM) images confirmed that the grain growth was defect mediated and occurred at defective interfaces at high temperatures. Films deposited at room temperature with 1% oxygen showed crystalline nature, while films deposited with pure argon at room temperature were amorphous as observed from KPFM images. The potential drop across the grain and grain boundary was determined by taking surface potential line profiles to evaluate the electronic properties.     

虚拟现实系统中水体绘制技术的研究与应用

在虚拟现实系统实现过程中,水体的模拟是非常重要的部分。本文通过对水体特点进行剖析,比较、借鉴总结大量国内外研究成果及文献,深入地分析和研究了不同场景中的水体实时模拟绘制方法,提出了具有较高绘制效率和视觉效果的能够在PC机上实现的不同水体模型的绘制方法。     

Thermal analysis of 3D composites by a new fast multipole hybrid boundary node method

This paper applies the hybrid boundary node method (Hybrid BNM) for the thermal analysis of 3D composites. A new formulation is derived for the inclusion-based composites. In the new formulation, the unknowns of the interfaces are assembled only once in the final system equation, which can reduce nearly one half of degrees of freedom (DOFs) compared with the conventional multi-domain solver when there are lots of inclusions. A new version of the fast multipole method (FMM) is also coupled with the new formulation and the technique is applied to thermal analysis of composites with many inclusions. In the new fast multipole hybrid boundary node method (FM-HBNM), a diagonal form for translation operators is used and the method presented can be applied to the computation of more than 1,000,000 DOFs on a personal computer. Numerical examples are presented to analyze the thermal behavior of composites with many inclusions.