保养也很重要：移动电源常见故障原因分析

曾经有消费者向笔者抱怨某名牌移动电源一年内两次返厂维修，对其质量表示担忧。也有移动电源行业的朋友抱怨因用户的不良使用方法使移动电源故障频发导致售后服务成本过高。作为2013年数码配件市场中最为热闹的产品，移动电源在使用过程中产生的各类大小故障问题确实不少，其中除了产品质量问题外，因用户不良的使用习惯和缺乏保养导致的故障也不少。为此我们特别准备本文，从引起移动电源故障的原因进行分析，与大家分享移动电源该如何保养以获得更长的使用寿命。     

浅析移动电源的质量问题

快速发展的电子产品在提供人性化体验和便捷的同时也具有高耗电的特性,这推动了移动电源的广泛使用,但目前移动电源缺乏统一的行业标准,容量虚标、容量转换效率低和安全性不足等质量问题大量存在,为了解决这些问题,必须有针对性的改善移动电源的评价标准,改善容量和安全性的问题,以利于移动电源的健康发展。     

移动电源的诞生之旅

移动电源虽小,但是因为使用了大容量锂离子电池,所以安全问题不能忽视。移动电源除了在电路设计上要考虑过流、过载、短路等保护之外,还要在生产制造端加强原料品质和制造工艺,才能两手抓,把移动电源的质量提高。移动电源领域山寨品牌众多,品质良莠不齐,安全问题频出不穷。接下来,我们一起来到移动电源的生产线,看看一款优秀产品在生产制造中需要经过哪些考验。     

移动电源的新发展

移动互联网的发展需要移动电源的支持,在这一领域主要有薄膜电池技术、压电材料技术、无线充电技术.在移动互联网时代,客户端的使用很重要的一部分在于其使用时间,无论性能多么优异,不能够在脱离有线电源时保持开通的手机,平板电脑或者其余智能产品都不能     

有容乃大 大容量移动电源导购指南

对当下的年轻人来说,现如今谁还没有几个移动设备呢？不管你是有多部手机,还是在拥有一款手机的情况下配备了一个iPad等平板产品,都不可避免地有经常需要充电的情况,因此拥有一个大容量移动电源就很有必要了。不管你是日常使用还是短途甚至长途旅行,大容量移动电源都可以较好地满足你对多部移动设备的充电需求。但面对市售多达几十上百个号称大容量移动电源、且外形迥异的产品,你是否有一种无力感呢？究竟大容量产品应该如何选择呢？     

移动电源，你虚标了吗？

最近,数码市场上突然有一个小家伙火爆了起来,好像一夜之间大家都开始销售和使用,它就是——移动电源。似乎出门包里不装一块移动电源,     

猫腻那点事儿 揭秘移动电源劣质电芯的陷阱

本刊在五月下旬对某品牌移动电源涉嫌使用二手电芯之事进行了报道后，迅速在业界引起了较大的反响。不少用户和厂商都通过微博和MC论坛等途径表示关注，特别是关于移动电源使用劣质电芯的问题更是受到了广受关注。     

首款三防两充移动电源MOMAX摩米士“硬汉”

浸水,进尘、摔撞,被喻为电子产品三大“杀手”,最常见的三防数码产品为手机和数码相机,而随着人们对数码产品使用条件的追求．三防产品也越来越受到关注,三防已经不仅局限于手机和数码相机。MOMAX摩米士推出了首款具备三防功能的“硬汉”移动电源．不仅具有三防性能和出色的产品设计,还配备有爬山扣,内置照明LED灯等贴心的户外设计,让这款移动电源产品有了一丝“移动电源中的SUV”的味道。     

从内解析 移动电源其实很简单

正普通用户衡量移动电源的标准其实很简单,无非是容量大、外观时尚。其实这只是衡量移动电源简单的标准,如果将一款移动电源拆后便会发现,内部原件的差别会为移动电源的使用带来直接的影响。抛18650电芯与聚合物锂电池不说,容易被用户忽略的电路板恰恰是一款移动电源的重中之重,其起到的升压、电路保护以及过载保护都是移动电源锁要的。     

移动应急电源变流器技术及其仿真研究

针对传统移动应急电源(EPS)大都依靠车载柴油发电机组提供电能,存在噪声大、效率低等局限性,提出了一种基于PWM变换技术的新型应急移动电源.在传统三相全控桥式变流器拓扑结构的基础上,增加电容、电感和接触器等简单器件,构成一种多功能变流器,使风能、太阳能等新能源能够应用于移动应急电源系统.Matlab仿真结果表明,系统输出电能质量较高,较传统EPS有更广泛的应用范围及更优越的性能,为新一代移动应急电源的开发提供了新的思路.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

Call for papers Special issue on Modeling and control technologies for civil,energy,and power systems

正The control of civil,energy,and power systems presents significant new challenges for modeling and control theory.The purpose of this special issue is to provide a forum for researchers and practical engineers to discuss the recent advances in modeling and control technology development for civil,energy,and power systems.Prospective authors are invited to submit their original contributions with the focus on theory or applications of modeling,control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate and promote academic exchange between Chinese and foreign scientists everywhere.