便携式CLS 3700特种测井仪检测系统开发与应用

介绍了以微型计算机系统代替CLS3700数控测井系统进行岩性密度测井仪、碳氧比测井仪和地层倾角测井仪3种特种仪器检测的原理、实现方法和应用效果。该系统结构简单，工作可靠，成本低廉，便于携带，已经投入使用，产生了良好的效果。     

KSDK-15N型矿用隔爆多功能可逆手提式开关的研制

主要介绍了ＫＳＤＫ－１５Ｎ型矿用隔爆多功能可逆手提式开关的结构特点、工作与保护原理以及相关的技术参数，指出了可逆手提式开关具有电路简单、保护功能齐全、体积小、重量轻等优点，在控制１５ｋＷ以下的矿用隔爆型电气设备时，完全可以取代ＱＣ８３－８０Ｎ矿用隔爆型可逆式磁力起动器．     

Portable single-pan wood stoves of high efficiency for domestic use

We describe and evaluate here certain new designs for single-pan wood stoves of high efficiency. The novelty in the design consists chiefly in the use of improved geometries for the combustion chamber and the vessel support. Extensive tests on water boiling and cooking demonstrate efficiencies exceeding 40%; these high values are attributable to stove operation at near stoichiometric conditions. The configuration termed Swosthee is among the most efficient stoves available to date, and is able to burn wet wood under partial loading with little accompanying smoke. Two versions of the same basic design provide inexpensive stoves that retain to a large extent the advantages of the original design like the generation of pollutants at low levels in the flue gases and the ability to handle wet wood. For the proposed designs the dependence of their cooking efficiency on vessel size has been obtained. These are reflected in terms of specific fuel consumption (whose variation is a function of vessel size). The present designs, when compared to other currently available improved stove designs like Priyagni, Tara, the Tamil Nadu Stove and theAstra three-pan stove, are better with respect to at least one of the following criteria-efficiency, cost, CO emission and portability. The stoves are presently being disseminated in small numbers. The results presented here are the outcome of the projects on “Wood Stoves” financed and administered by the Karnataka State Council for Science and Technology, Indian Institute of Science, Bangalore.     

一种基于安全芯片的可信移动存储设备的双向认证机制

随着信息技术和存储技术的发展,移动存储设备的安全问题日益突出并亟待解决。针对目前移动存储设备安全措施薄弱,对身份认证的能力不足的现状,本文提出向移动存储设备引入安全芯片,由安全芯片生成密钥以及身份信息,建立可信移动存储设备与主机的双向身份认证机制,以增强移动存储设备的安全性。认证双方由安全芯片产生身份密钥和加密密钥,交换加密密钥的公钥和身份信息,建立初始的信任关系,当可信移动存储设备需要与主机交互数据前,必须以消息请求响应的方式进行双向的身份认证,消息的传输由加密密钥来保护,身份信息的验证由身份密钥来实现。本文使用形式化分析的方法,对双向身份认证机制的过程进行了分析,证明了双向认证机制符合安全性要求,增强了移动存储设备的安全性。将安全芯片引入移动存储设备和主机,在此基础上建立主机与可信移动存储设备的信任关系,在数据交互前进行双向的身份认证,对双方的身份进行验证与核实,防止了数据的非法访问,增强了移动存储设备的数据安全性。     

计算机与电子类专业自主实验教学模式研究

在研究可供计算机与电子类专业学生随身携带的系列便携式实验教学设备的基础上,探讨一种新型的自主实验教学模式。介绍研发该系列设备的基本设想、便携式EDA实验板的设计以及该模式的理念与内容,在有限的资源下为学生提供充足的实验条件,营造良好的学习与课外科技创新氛围,并有效缓解实验场地、设备等资源不足的矛盾。     

新型矿用便携式静态电阻应变仪的研制

为了解决目前开采速度较快或分叉巷道多的矿井使用固定应变仪安装复杂、维护困难、成本较高等突出问题,提出了一种新型矿用便携式静态电阻应变仪。该应变仪以ATmega16L单片机为主控芯片,硬件上采用电子程控开关切换、精密仪表放大器和先进低频滤波等对信号采集调理,LCD显示检测结果,利用专用时钟芯片记录巷道顶板压力检测时间,并由SD卡存储;软件上下位机利用AVR单片机的输入捕捉,PWM,SPI等功能,上位机界面用LabVIEW编写,友好方便。通过对其工作性能的测试,证明了该应变仪精度高、电路简单、抗干扰能力强等优点。     

Photoluminescent Histidine-Stabilized Gold Nanoclusters as Efficient Sensors for Fast and Easy Visual Detection of Fe Ions in Water Using Paper-Based Portable Platform

Herein is presented a novel and efficient portable paper-based sensing platform using paper-incorporated histidine stabilized gold nanoclusters (His-AuNCs), for the sensitive and selective detection of Fe ions from low-volume real water samples based on photoluminescence (PL) quenching. Highly photoluminescent colloidal His-AuNCs are obtained via a novel microwave-assisted method. The His-AuNCs-based sensor reveals a limit of detection (LOD) as low as 0.2 μM and a good selectivity towards Fe ions, in solution. Further, the fabricated portable sensing device based on paper impregnated with His-AuNCs proves to be suitable for the easy detection of hazardous Fe levels from real water samples, under UV light exposure, through evaluating the level of PL quenching on paper. Photographic images are thereafter captured with a smartphone camera and the average blue intensity ratio (I/I₀) of the His-AuNCs-paper spots is plotted against [Fe²⁺] revealing a LOD of 3.2 μM. Moreover, selectivity and competitivity assays performed on paper-based sensor prove that the proposed platform presents high selectivity and accuracy for the detection of Fe ions from water samples. To validate the platform, sensing assays are performed on real water samples from local sources, spiked with 35 μM Fe ions (i.e., Fe²⁺). The obtained recoveries prove the high sensitivity and accuracy of the proposed His-AuNCs-paper-based sensor pointing towards its applicability as an easy-to-use, fast, quantitative and qualitative sensor suitable for on-site detection of toxic levels of Fe ions in low-volume real water samples.     

便携式矿用钢丝绳张力测试仪的设计

文章介绍了一种基于单片机μPSD3334的钢丝绳张力测试仪的设计,给出了仪器的硬件电路和软件流程图。该仪器适用于测试煤矿多绳提升钢丝绳的张力及其张力差。     

面向 Web 的 PDF 文档构建技术

介绍利用Web技术进行PDF文档构建的策略方法,探讨PDF文档构建中水印生成技术、表格标题头处理技术、大数据流数据结构设计、表格文本块动态分割技术、分页控制技术等。设备管理Web系统的应用实践表明,PDF文档构建技术精巧,为类似的应用系统提供可供借鉴的解决方案。     

便携式接触网安全巡检系统

根据当前接触网巡视设备的特点,设计了一种便携式接触网巡检系统,适用于在多种车辆上实现对接触网的安全巡视。系统对接触网线路进行视频巡视,并具备对视频数据的显示、存储、管理和分析功能。测试表明:系统运行稳定、图像清晰,具有一定的应有价值。