量子点作为离子探针的分析应用

量子点（quantumdots,QDs）又称半导体纳米晶（semiconductornanocrystals）是一种高效的光致发光纳米晶体。近年来,量子点表面化学的快速发展,使其得到了越来越广泛的应用。本文评述了近年来量子点在无机离子以及H’分析中的应用及进展,阐述了量子点可用于离子探针的机理,介绍了量子点作为H’探针在生物以及小分子检测中的应用并对其未来的发展方向进行了展望。     

基于差异备份的Cookie注入挂马技术及调查方法研究

文章分析了SQL注入的成因，并结合一款ASP注入防火墙的源代码，分析了注入防火墙的基本原理，并结合具体的Sniffer报文分析了Cookie注入技术。该文通过一个实际案例重点研究了差异备份的挂马技术，总结出针对各种日志进行关联分析，并获得攻击线索的方法，即根据行为特征确定攻击源方法。     

基于平稳小波/Contourlet域非线性扩散的印章图像去噪

在印章鉴别系统中,正确鉴别印章的前提条件是得到高质量的预处理图像.提出了分别将平稳小波变换、Contourlet变换与各向异性扩散相结合的印章图像去噪方法.首先对图像进行平稳小波/Contourlet分解,然后高频部分和低频部分分别采用自适应对比度扩散和全变差扩散,最后重构图像.给出了实验结果,并与现有的小波阈值收缩和...     

顶空分析技术在食品分析中的应用进展

顶空分析技术具有样品预处理简单、杂质干扰小、检测灵敏度高等优点在食品分析中应用广泛。主要综述了顶空分析技术在食品分析方面的应用进展,并对其发展前景进行了展望。     

A multiple strategic evaluation for fault detection in electrical power system

A new combined formalism is described to detect faults in electrical power systems in this work. The aim of fault detection is to monitor and control the system which guarantees stable supply of electrical energy to consumers. To solve this problem, it has been proposed an integrated use between state space, optimization and analytical method by establishing a methodology for its completion. Initially, state space method performs through deviations signaled by its output, an analysis with relation to direction of fault in each component of power system. Though, state space is in possession of as much information as possible coming from output signals, can identify direction where disturbance has been occurred. Finally, the processing is done by optimization and analytical methods, which analyze the exact fault type and locations, using these signs, corrective action have been taken. By using proposed technique, the tasks of fault detection, classification, and location are accomplished. The common case of faults occurring in the electrical power system has been illustrated to verify the proposed methodology.     

Optical properties of Tb and Eu doped cubic YAlO3 phosphors synthesized by sol–gel method

In this work, terbium and europium doped YAlO₃ phosphors were synthesized by sol–gel method. It has been shown that after annealing at 1000 °C these phosphors crystallize in the cubic garnet phase, similar to Y₃Al₅O₁₂. As evidenced by the time-resolved photoluminescence spectroscopy and Maximum Entropy Method, the photoluminescence decay of both europium ⁵D₀ and terbium ⁵D₄ states has two lifetime components: short and long, both of the order of milliseconds. Moreover, for both phosphors the short photoluminescence lifetime was ascribed to the ions occupying low-symmetry sites in the vicinity of the nanocrystal surface, while the long decay component was related to the ions present in the bulk of YAlO₃ nanocrystal. For both dopants, the long lifetime component of Tb³⁺ and Eu³⁺ emission is longer than the equivalent lifetimes in bulk Y₃Al₅O₁₂ crystal.     

Decision support system for emergency management: Road tunnels

Recent disasters have shown that road tunnels are especially complex environments for decision making. A fast and effective response to emergencies in road tunnels is a key factor for life safety. This paper presents a decision support system (DSS) for emergency management in road tunnels. Based on a specific methodology, the system provides the operator with decision recommendations to deal with the emergency in real time. Furthermore, the system uses predictive tools to estimate the severity of the accident or incident, as well as rescue and evacuation times. This information is very useful during the first stages of an emergency when information is scarce, incomplete and inaccurate, yet the tunnel operator is required to make the right decisions under a high level of stress. The DSS reduces the decision circle and allows the operator to make critical decisions based on dynamic alternatives. The system has been tested in various hypothetical emergency cases based on the Tunnel of Lantueno in the A-67 Highway, Spain. The application cases show that the DSS provides reasonable and consistent results.     

衍生化-液相色谱-紫外检测联用测定尿中γ-羟基丁酸

本文建立了尿中γ-羟基丁酸的水相催化衍生化-液相色谱-紫外检测联用分析方法。尿样中直接加入衍生化试剂α-溴苯乙酮、催化剂四丁基溴化铵,在80℃水浴中加热30 min,衍生化产物直接进行液相色谱-紫外检测。尿中γ-羟基丁酸浓度在0.5μg/mL-250μg/mL之间具有良好的线性关系,最低检出限为0.20μg/mL。该方法具有较好的灵敏度、准确性和精密度,能够满足司法鉴定工作的要求,具有一定的实用性。     

基于OSPF路由欺骗的“黑洞”攻击及防御措施研究

文章详细分析了“黑洞”攻击的基本原理,研究了基于“黑洞”攻击的网络监听方法,给出了中转数据报的详细结构,提出了防御黑洞攻击的两种策略,即采用复杂密码加MD5认证方式和尽量缩小OSPF协议的扩散区域,可以在一定程度上预防“黑洞”攻击。     

基于LAMP平台的网站构建与分析

伴随着互联网应用及黑客技术的快速发展,网站挂马及基于网站发布虚假敏感信息等事件也层出不穷。文章简要介绍了基于LAMP平台的PHPBB论坛网站的构建方法,并详细分析了LAMP平台的关键目录结构、配置文件、运行进程等。通过在实验环境下模拟发布虚假信息及对网站进行挂马攻击,在数据库和Apache访问日志中查找网站服务器的运行痕迹,提出了在LAMP平台追踪定位恶意IP地址的具体方法。