Advances on Emerging Materials for Flexible Supercapacitors: Current Trends and Beyond

The progressive size reduction of electronic components is experiencing bottlenecks in shrinking charge storage devices like batteries and supercapacitors, limiting their development into wearable and flexible zero‐pollution technologies. The inherent long cycle life, rapid charge–discharge patterns, and power density of supercapacitors rank them superior over other energy storage devices. In the modern market of zero‐pollution energy devices, currently the lightweight formula and shape adaptability are trending to meet the current requirement of wearables. Carbon nanomaterials have the potential to meet this demand, as they are the core of active electrode materials for supercapacitors and texturally tailored to demonstrate flexible and stretchable properties. With this perspective, the latest progress in novel materials from conventional carbons to recently developed and emerging nanomaterials toward lightweight stretchable active compounds for flexi‐wearable supercapacitors is presented. In addition, the limitations and challenges in realizing wearable energy storage systems and integrating the future of nanomaterials for efficient wearable technology are provided. Moreover, future perspectives on economically viable materials for wearables are also discussed, which could motivate researchers to pursue fabrication of cheap and efficient flexible nanomaterials for energy storage and pave the way for enabling a wide‐range of material‐based applications.     

Quasifractal Networks as Current Collectors for Transparent Flexible Supercapacitors

A high performance, transparent, and simultaneously mechanically flexible supercapacitor, with electrodes based on a bio‐inspired, quasifractal metallic network is demonstrated. Excellent performance parameters, such as the specific capacitance of 5.6 mF cm^?2 (at 45% transparency), great long‐term electrochemical and mechanical stability under stress, and low cost, make this one of the best reported, and most promising candidates for applications in the wearable, transparent integrated electronics.     

无源元件市场近况分析

无源元件市场概况 无源元件包括电阻、电容及电感,是电子信息产品必不可少的基本元件。2000年全球无源元件的销售额约为350亿美元。目前日本为全球最大的无源元件供应国,约占总产值的三分之一,其次为西欧和美国。无源元件市场可划分为计算机、通信、汽车电子与消费性电子产品等(如图1)。以往全球无源元     

脑机接口技术研究概述

脑机接口(Brain-Computer Interface, BCI)是在人脑和外界之间建立不依赖于常规大脑信息输出通路(外周神经和肌肉组织)的一种通讯系统.本文概述了基于脑电信号(EEG)的BCI技术的基本原理、研究方法、类型、研究现状,并分析了目前存在的问题与应用前景.     

脑-机接口技术综述

脑-机接口是在人脑与计算机或其它电子设备之间建立的直接的交流和控制通道,通过这种通道,人就可以直接通过脑来表达想法或操纵设备,而不需要语言或动作,这可以有效增强身体严重残疾的患者与外界交流或控制外部环境的能力,以提高患者的生活质量.脑-机接口技术是一种涉及神经科学、信号检测、信号处理、模式识别等多学科的交叉技术.本文对脑-机接口技术的发展、研究现状、工作原理以及涉及的关键技术进行了较为详细地综述,在总结脑-机接口技术存在问题的基础上,探讨了该领域进一步研究的方向.     

高功率以太网供电技术综述

以太网供电国际标准(802.3af)在2003年6月获得了通过,其允许将功率加载在以太网线上同数据一起传输,但是该标准容许的最大传输功率(小于12.95 W)限制了以太网供电的应用.近年来高功率以太网供电标准(802.3at)被提出,其容许的传输功率接近30 W,这一标准的批准将推动以太网供电技术得到进一步的发展.文中分析了高功率以太网供电技术的规范,讨论了以太网供电技术的最新进展,同时给出了一种实现高功率以太网供电的技术方案.     

通信保密和信息安全技术概览

信息系统的运行是否安全可靠,远程信息通信是否安全保密是制约信息系统进一步发展的重要因素之一。因此,人们对通信保密和网络设备的安全特别关心,对与信息处理有关的计算机系统、操作系统、芯片等基础单元,及由网络设备构建的应用系统也很关注。     

功率晶体管建模现状及特性研究

功率晶体管建模是PA设计的基础,其精度直接决定了PA设计的成败问题。研究功率晶体管建模的发展现状,将有助于把握该技术的变革特点和未来发展趋势,具有极其重要的意义。通过文献调研,文章总结了功率晶体管模型的发展现状及其中一些有待解决的问题,为未来的研究指明了方向。     

GaAs Pixel-Detector Technology for X-ray Medical Imaging: A Review

An attempt is made to analyze and summarize the literature data on hybrid x-ray GaAs pixel detectors designed for medical imaging. Criteria are stated for selecting a semiconductor material. It is shown that GaAs is currently preferable to the other semiconductor materials. Detector figures of merit used to select a semiconductor material and a process technology are listed. Major types of x-ray detector based on bulk-grown or epitaxial GaAs are described, namely, the planar Schottky, the planar p-i-n, and the 3D detector. The influence is considered of different process steps (contact formation, passivation coating, hybridization, etc.) on detector figures of merit. Monolithic technology is briefly discussed.__________Translated from Mikroelektronika, Vol. 34, No. 4, 2005, pp. 274–290.Original Russian Text Copyright © 2005 by Lezhneva, Melkadze, Khvedelidze.     

技术评价:圆片级封装

本文对圆片级封装的定义、演变、进展状况及支撑技术进行了介绍和分析评论。     

系统发生树构建技术综述

随着不同的分子测序技术的飞速发展使得大量的DNA分子数据不断涌现,这给生物学家提供了大量的数据使其实现重构地球上所有生命的进化树的梦想.并且,进化树的研究对于解决现代分子生物学中的许多问题都是非常关键的,如多序列比对、蛋白质结构和功能预测以及药物设计等等.但是构建进化树又是一个非常复杂的问题.因此,进化树的研究成了一个研究热点.本文介绍了进化树研究的发展、研究现状,最后在总结现有的进化树构建技术存在的问题的基础上探讨了该领域进一步的研究方向.     

A Review of WDM Technology and Applications

The rapid growth in demand for high-capacity telecommunication links, and the speed limitation of single-wavelength links, has resulted in an extraordinary increase in the use of wavelength-division multiplexing (WDM) in advanced lightwave networks. In this work we review the basic concepts of WDM, describe its key features and why network providers are using it, review the enabling technologies, discuss the basic operating characteristics and their associated parameters, and show how WDM is being used worldwide in both terrestrial and undersea installations. Included in this are discussions on management functions that are needed for monitoring the status and health of WDM networks.     

声电荷输运评述

声电荷输运是模拟信号处理领域的重要发展方向,有十分重要的应用价值。当前这方面的研究正在迅速发展之中。本文在介绍其原理及ACT、HACT两种结构的同时,对照比较两种结构的优缺点,集中评述声电荷输运效率、声电荷输运器件的效率、二阶效应、无损传感电极的影响以及可程控器件和光注入功能的重要前景等,讨论了在这些方面目前尚有待研究解决的问题。     

芯片尺寸封装技术

芯片尺寸封装（ＣＳＰ）技术是近年来发展最为迅速的微电子封装新技术。文中介绍了该技术的基本概念、特点、主要类型及其应用现状和展望。     

Significance of Current Collectors for High Performance Conventional Lithium-Ion Batteries: A Review

Conventional lithium-ion batteries (LIBs) are constantly evolving to improve their electrochemical performance and safety. In the past decade, research on electrode and electrolyte materials has significantly promoted the development of conventional LIBs. However, the current collector (CC) in conventional LIBs has not received sufficient attention. As a transfer unit that collects and disperses electrons from electrodes and transports them to the load, the performance of the CC significantly affects the performance of LIBs. This article reviews the impact of the CC on the electrochemical performance and safety of conventional LIBs in four aspects: CC requirements, manufacturing process, surface coating modification, and multifunctionalized CCs. Meanwhile, this review provides an objective summary and prospect on the transition from single-functionality to multifunctionality requirements for CC, as well as the future needs for CC development and the technical hurdles that should be overcome. The article focuses on providing a detailed insight into the important impact of CCs on conventional LIBs, which has not received enough attention in the past. It emphasizes the need and urgency for the development of multifunctional CCs to provide new ideas for improving the performance of conventional LIBs.     

装备测试性验证技术综述

装备测试性验证是指为检验设计和制造所赋予装备的测试性是否满足规定的测试性要求而进行的试验与评价工作,是装备故障预测与健康管理设计的重要依据,也是装备采办管理和科学决策的基础.如何有效地开展测试性验证试验,是理论和工程实践中亟待解决的问题,具有重要的理论和工程应用价值.综述了装备测试性验证技术的国内外发展现状,阐述了测试性验证的技术体系,分析了测试性验证的关键技术,指出了目前亟待解决的关键问题和难点问题,最后,在对当前测试性实物验证和非实物验证技术方案进行综合分析的基础上,对测试性验证技术方案进一步的研究发展给出了建议.     

立体电视技术体系与研究现状

一项优秀的、切合实际的立体电视技术的研究规划,应当统筹考虑系统的各个环节,包括立体视频信号的获取、传输、接收、显示。考虑到技术成本、社会成本、运营成本等诸多非技术因素,一个理想的立体电视系统方案,应当具备无辅助立体显示．平面兼容、窄带宽、高清晰、可随机访问、无侵扰交互、可分级等性能。欧盟在框架计划的支持下,对基于广播、互联网、移动通信的硬件平台,进行了一系列的立体电视系统的项目研究,取得了良好的进展。南京大学面向未来立体电视接收终端,研制成功了无辅助立体显示器。最后,针对我国立体电视技术的研究现状提出工作建议。