Size‐Controlled Soft‐Template Synthesis of Carbon Nanodots toward Versatile Photoactive Materials

Size‐controlled soft‐template synthesis of carbon nanodots (CNDs) as novel photoactive materials is reported. The size of the CNDs can be controlled by regulating the amount of an emulsifier. As the size increases, the CNDs exhibit blue‐shifted photoluminescence (PL) or so‐called an inverse PL shift. Using time‐correlated single photon counting, ultraviolet photoelectron spectroscopy, and low‐temperature PL measurements, it is revealed that the CNDs are composed of sp² clusters with certain energy gaps and their oleylamine ligands act as auxochromes to reduce the energy gaps. This insight can provide a plausible explanation on the origin of the inverse PL shift which has been debatable over a past decade. To explore the potential of the CNDs as photoactive materials, several prototypes of CND‐based optoelectronic devices, including multicolored light‐emitting diodes and air‐stable organic solar cells, are demonstrated. This study could shed light on future applications of the CNDs and further expedite the development of other related fields.     

Lead‐Free Polycrystalline Ferroelectric Nanowires with Enhanced Curie Temperature

Ferroelectrics are important technological materials with wide‐ranging applications in electronics, communication, health, and energy. While lead‐based ferroelectrics have remained the predominant mainstay of industry for decades, environmentally friendly lead‐free alternatives are limited due to relatively low Curie temperatures (T _C) and/or high cost in many cases. Efforts have been made to enhance T _C through strain engineering, often involving energy‐intensive and expensive fabrication of thin epitaxial films on lattice‐mismatched substrates. Here, a relatively simple and scalable sol–gel synthesis route to fabricate polycrystalline (Ba_0.85Ca_0.15)(Zr_0.1Ti_0.9)O₃ nanowires within porous templates is presented, with an observed enhancement of T _C up to ≈300 °C as compared to ≈90 °C in the bulk. By combining experiments and theoretical calculations, this effect is attributed to the volume reduction in the template‐grown nanowires that modifies the balance between different structural instabilities. The results offer a cost‐effective solution‐based approach for strain‐tuning in a promising lead‐free ferroelectric system, thus widening their current applicability.     

Zinc sulfide nanoparticles template by bacterial cellulose and their optical properties

Spherical zinc sulfide (ZnS) nanoparticles dispersed on bacterial cellulose (BC) nanofibers homogeneously were successfully fabricated through in situ precipitation method using BC as template and explored the formation mechanism. The structure and properties were characterized by Fourier transform infrared, X‐ray diffractometer, FESEM, and so on. The results demonstrated that the nanoparticles were sphalerite structure ZnS and the size increased with the increase of the zinc precursor concentrations. Moreover, a high photocatalytic activity (92%) for degradation of methyl orange was observed and the photoluminescence spectra of the nanocomposites exhibited a blue emission band centered at 468 nm. The flexible BC membrane carried of ZnS nanoparticles might be a promising candidate in the application fields of fluorescence and photo‐catalysis. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40874.     

基于工作流的总体研制流程跟踪管理系统设计

为了满足高密度发射下总体设计研制进程管理的需求,提出并实现了基于工作流技术的总体研制流程跟踪管理系统,协同总体各专业对多任务进行设计,固化了研制流程模板知识库管理,解决了发射任务六大里程碑管理,通过与AVIDM系统计划管理模块和文档管理模块的集成,实现了对整个研制任务所有步骤进行统一跟踪、统一下发到AVIDM项目管理,最终完成研制任务的闭环管理,确保研制进度受控,减少研制风险。     

钢筋桁架楼承板在现浇混凝土结构中的应用

主要阐述了钢筋桁架楼承板在现浇混凝土结构应用过程中的施工要点以及难点,指出采用钢筋桁架与镀锌底板结合的模式替代模板和部分钢筋,省去了全部的模板和部分方木的使用,既节约了大量劳动力,又保护了环境,具有较为深远的社会和经济意义。     

A new spontaneous pupillary oscillation-based verification system

A novel pupillary-based verification system is introduced, along with the early identity authentication results and analysis, based on the spatio-temporal features computed from the spontaneous pupillary oscillations. The authors demonstrate that this biometric trait has the capability to provide enough discriminative information to authenticate the identity of a subject. A new methodology to compute the spatio-temporal biometric template recordings of the pupil area changes, in a video-oculography sequence under constant luminance level, is also introduced in this paper. According to the authors’ knowledge, there is no evidence that other attempts were made, addressing this methodology to distinguish individuals based on the spatio-temporal representations, computed from the normal dilation-contraction behavior of the pupil. In this work, liveness will be detected by using the information obtained from the spontaneous pupillary oscillation mechanism. Preliminary experiments were conducted by using a particular own collected database, resulting in a (Equal Error Rate) in the order of 0.2338%.     

新型复合木方研制及现场应用研究

为了解决混凝土浇筑施工中用于模板支撑的木方容易出现折断、腐蚀,从而难以再次使用的问题,采用槽型铝合金和木方进行有机结合的方式,研制成功一种新型的复合木方。新型木方使用具有耐腐蚀性强、耐久性好、强度高、节约木材资源等一系列优点,具有广阔的市场前景和重要的现实意义。     

“全因素”思维与设计

互联网全球化的时代要求各产业的从业者必须时刻做好被全方位考验并被全景式展现的准备,“全因素”设计理论在当前的时代语境中仿佛一块有屏蔽个别局部的功能的“模板”,解构并重新组合设计流程中的各个构成元素,这一方法论系统将对设计行业产生正向的建设性作用。     

建筑模板工程施工安全技术的探讨

本文结合工程实例,从模板专项方案的编制、审核,模板支架的架设、模板安装、使用、拆除、验收几个重点环节,对模板施工安全的影响因素进行了分析,并提出了应对措施,期望能对模板工程的施工安全提供有益的参考。