Open‐Shell Donor–Acceptor Conjugated Polymers with High Electrical Conductivity

Conductive polymers largely derive their electronic functionality from chemical doping, processes by which redox and charge‐transfer reactions form mobile carriers. While decades of research have demonstrated fundamentally new technologies that merge the unique functionality of these materials with the chemical versatility of macromolecules, doping and the resultant material properties are not ideal for many applications. Here, it is demonstrated that open‐shell conjugated polymers comprised of alternating cyclopentadithiophene and thiadiazoloquinoxaline units can achieve high electrical conductivities in their native “undoped” form. Spectroscopic, electrochemical, electron paramagnetic resonance, and magnetic susceptibility measurements demonstrate that this donor–acceptor architecture promotes very narrow bandgaps, strong electronic correlations, high‐spin ground states, and long‐range π‐delocalization. A comparative study of structural variants and processing methodologies demonstrates that the conductivity can be tuned up to 8.18 S cm^?1. This exceeds other neutral narrow bandgap conjugated polymers, many doped polymers, radical conductors, and is comparable to commercial grades of poly(styrene‐sulfonate)‐doped poly(3,4‐ethylenedioxythiophene). X‐ray and morphological studies trace the high conductivity to rigid backbone conformations emanating from strong π‐interactions and long‐range ordered structures formed through self‐organization that lead to a network of delocalized open‐shell sites in electronic communication. The results offer a new platform for the transport of charge in molecular systems.     

Delamination‐Free Functional Graphene Surface by Multiscale,Conformal Wrinkling

Obtaining a delamination‐free wrinkled functional graphene surface in layered systems is an interesting challenge because the interface is usually too weak to withstand interfacial stress mismatch, which can trigger mechanical instability. In this paper, a general strategy is proposed toward addressing the delamination limitation imposed by fabricating conformal graphene wrinkles with bilayer systems of poly(methyl methacrylate) (PMMA) and polydimethylsiloxane (PDMS). To improve the interfacial strength, a postcuring transfer process is introduced to form a gradient interface layer without interfacial liquid between the PMMA and PDMS by entanglement of polymer chains during high‐temperature curing. Compared to the conventional wet transfer of graphene,the transfer method can greatly enhance the interfacial strength. The chemical and mechanical mechanisms underlying the enhancement are revealed both experimentally and theoretically in terms of the transition from the buckled‐induced delamination state to the delamination‐free wrinkled state. Moreover, the light diffraction behaviors of multiscale graphene wrinkles are initially demonstrated to be an interesting continuous pattern induced by overlapping. The delamination‐free conformal wrinkled functional graphene surface can provide valuable insight and design guidelines for the fundamental problems of deformed graphene and its applications in flexible functional devices.     

基于FlexRay总线的通讯单元设计

FlexRay是符合下一代车载网络要求的通讯协议。文章针对FlexRay汽车总线,给出一种通讯单元的设计方案。Freescale公司的16位汽车微控制器MC9S12XF512集成了双通道FlexRay协议v2.1,通过FlexRay通讯控制器TJA1080实现节点和FlexRay总线的通信,并且通过GSM/GPRS模块实现通讯功能。     

物联网业务特征及业务模型研究

介绍了物联网多种应用方式,特别对车联网、智能家居等物联网应用的网络通信方式、资源消耗等通信特征及参数进行重点分析,得出普遍适用的物联网应用网络层通信模型分析方法。     

基于时空变换的CT界面快速定位方法研究

相控阵超声CT成像技术现在已经逐渐应用于工业检测中,本文在通过研究相控阵理论的基础上,利用了时空变换法把检测到的三维时间信号族变换到二维空间灰度图,并且通过研究灰度图特征,达到快速对检测界面定位的目的。     

商业银行信息系统研发风险模型研究

随着网络攻击方向的转变和攻击形式的层出不穷,应用系统安全问题日益凸显,而从研发过程着手提升信息系统安全性已逐渐成为业界共识.通过对当前主流的几种软件安全开发模型的对比与分析,总结软件安全开发模型的共有特点并结合商业银行信息系统风险特征,提出一种基于安全活动的商业银行信息系统安全研发模型,通过在信息系统研发全生命周期各阶段实施安全活动来提升其安全性,降低商业银行信息系统风险.     

卫星地球站天馈系统的技术改造

本文从实际应用出发,以浙江卫星地球站天馈系统为实例,对卫星站上行链路天馈系统的结构和功能作简要分析,剖析目前天馈系统存在的缺陷,并针对问题提出改造思路。结合同期广电总局对全国地球站提出的50dB耦合器的技术改造要求,详细阐述新天馈系统的设计方案和具体实施步骤。     

产品开发过程标准化对产品开发质量的影响

本文从产品开发的标准化的一些内容来探讨企业产品开发过程标准化对产品开发质量的影响.     

更换旧蓄电池组应注意的安全问题

先期使用的大批阀控式密封铅酸蓄电池(VRLA电池),及固定型防酸隔爆式铅酸蓄电池(GGF电池)由于各种原因容量下降,不能保证其正常使用需进行更换。本文对如何安全可靠进行新旧蓄电池组的更换割接提出建议。     

Der PC in zehn Jahren und seine Auswirkungen auf die Gesellschaft

In this article it is argued that in ten years’ time personal computers as we know them now won’t exist anymore — all their functions will by then be integrated in mobiles which will be our steady companions. As such, mobiles will change our lives to an enormous extent. Technology as well as consequences will be discussed in this paper.