二维黑磷的制备及光电器件研究进展

黑磷有随层数可调的直接带隙和独特的各向异性结构等众多优异的性质,因此近年来受到科研人员的广泛关注.本文概述了二维黑磷的制备方法,重点综述了黑磷独特的非线性光学性质、各向异性光学性质及它在光电器件中的应用.最后,对黑磷的应用前景与一些亟待解决的问题做了简单的讨论.     

The Effects of Washing and Formaldehyde Sterilization on the Mechanical Performance of Poly(methyl Methacrylate) (PMMA) Parts Produced by Material Extrusion-Based Additive Manufacturing or Material Jetting

Nowadays, personalized medical implants are frequently produced through additive manufacturing. As all medical devices have to undergo specific washing and sterilization before application, the effects of a predefined cleaning routine that is available to the clinical institutes, washing with chemical agent and formaldehyde fumigation, on the mechanical behavior of printed parts are examined. Mechanical properties of parts manufactured by fused filament fabrication (FFF) and ARBURG plastic freeforming (APF) using two poly(methyl methacrylate) (PMMA)-based materials, 3Diakon and CYROLITE MD H12, respectively, are analyzed using flexural and impact tests. An influence of cleaning treatments on the mechanical properties of APF samples is not detected. FFF samples, however, show lower impact strength after washing, but not after sterilization. The fracture surfaces, porosity values, or chemical structure assessed by Fourier-transform infrared (FTIR) spectroscopy could not explain this decrease. Influence of the cleaning treatments on the material itself is assessed using thin compression-molded specimens. The influence on the stress–strain curves is negligible, apart from a slight but significant reduction in the yield stress. FTIR spectroscopy and scanning electron microscopy analyses of the fracture surfaces do not show detectable differences among differentially treated samples.     

ITO dry‐etching mechanism and its application in the fabrication of LCDs

Abstract— Based on HI gas‐plasma etching (high‐density plasma‐assisted RIE), the activation energy for an ITO dry‐etching reaction was obtained. The value was calculated 35–40 kJ/mol for 20 sec from the reaction starting time. The reaction dead time is characteristic of the ITO dry‐etching process, but the reaction is relatively simple. Therefore, ITO dry‐etching technology, based on HI gas plasma, is useful in the the fabrication of LCDs, and was used in a recently developed Multi‐Coaxial‐Plasma‐Source (MCPS) dry etcher.     

多孔陶瓷制备新工艺及其进展

综述了多孔陶瓷的传统制备方法，着重介绍了纤维多孔陶瓷，凝胶注模工艺、气凝胶和木材陶瓷等新兴材料与工艺及其研究进展。分析了多孔陶瓷存在的问题和今后的发展方向。     

钢结构厂房工程施工质量控制的要点和措施

论述了大型钢结构厂房的钢结构生产、钢结构安装过程中的质量控制等钢结构的制作与安装施工技术,并分别从开工前的准备和施工中的质量管理讲述了钢结构厂房施工质量控制的要点和措施。     

某科技竞赛展厅钢结构屋盖施工方案

某科技竞赛展厅钢结构屋盖主梁采用27m跨预应力索桁架,次梁采用8m跨H型钢,屋面采用彩钢屋面板。本文主要介绍预应力索桁架节点连接构造,索桁架与次梁节点连接构造,上弦支撑布置方式及其与主、次梁节点连接构造,钢结构屋盖施工工法等,可供同类工程设计及施工时参考。     

原位自生金属基复合材料的制备方法

介绍了原位自生金属基复合材料的性能,概述了几种原位制备颗粒增强金属基复合材料(MMCs)的方法:包括自蔓延高温合成法(SHS)、弥散放热法(XD法)、直接反应法(DRS)、混合盐反应法、接触反应法、反应喷射沉积法、反应挤压铸造法、VLS法等.最后指出要达到工业生产应用,还需要解决的一些难题,并指明了今后的研究方向.     

嘉兴污水处理工程高位井施工

嘉兴污水处理工程高位井井体分5节制作,采用水力机械挖土分3次排水下沉法施工。由于采用了大口径井点降水,实现了排水下沉深度达29.35m,创上海地区软土层中沉井排水下沉深度的记录。文章叙述了沉井制作、下沉的全过程。其施工技术可供类似工程参考。     

飞秒激光多次聚焦在并行加工中的应用研究

飞秒激光的并行加工多是利用分光元件先分光再加工,在实际应用中,这种方法无法对加工出的平行结果进行灵活的控制。本文通过控制飞秒激光在介质中的多次聚焦,实现微光波导的并行加工,总结出影响加工的控制因素,并且对这种加工方法的机理和控制因素作了理论分析。由于不依赖分光元件,该方法对并行加工的控制相对灵活。对于飞秒激光的并行加工,该方法提出了一个值得发展的方向。     

双面铝箔复合保温风管在空调工程中的应用

描述天津某空调工程的风管系统采用双面铝箔复合保温风管代替传统的镀锌钢板风管的设计与施工过程。详细讲解复合风管的优越性能、制作工艺及风管的安装,并以工程实例分析替代方案的经济可行性。