成瘾、娱乐和欲望:美国未来的怪诞社会——评华莱士的《无尽的玩笑》

华莱士的小说《无尽的玩笑》向读者展示了一幅美国未来的怪诞社会的图景。成瘾、娱乐和欲望构成了这个社会的主要特色以及这部小说的三大主题:人们对各种东西的执着和成瘾摧毁了人的自主性,导致了人的依赖性,是现代社会种种问题的根源;以娱乐为目的的大众文化的极度扩张造成了人们个性的迷失;在美国未来极端消费的社会中,对享乐的贪求和欲望造成了时代的悲哀。未来的美国社会就是一个无尽的玩笑

An Android privacy leakage malicious application detection approach based on directed information flow

Android 系统占据智能移动终端市场81.9%的份额,预计还会持续增长.同时,针对 Android 系统的恶意应用日益增多,Android 恶意应用程序检测技术已经成为安全领域研究的热点问题.本文提出一种基于有向信息流的针对Android 隐私泄漏类恶意应用的检测方法.该方法首先反编译应用程序,分析配置文件中的权限申明; 基于隐私点数据集构建隐私数据有向信息流模型; 通过在信息流模型中对隐私点的跟踪分析,检测隐私数据是否被发送出去而导致信息泄漏.该方法在对Android 第三方市场的7 985个应用程序检测中,发现357个恶意应用.通过实验方式验证了检测结果的准确性.结果表明该方法对Android 隐私泄露类恶意应用具有很好的检测效果.Android devices occupy 81.9% of the total smart phone market.However,the malicious applications of Android system are increasing,and the detection technology has become the hot topic in security research.We propose a new Android detection approach of privacy leakage malicious application based on directed information flow.This approach first decompiles the application and analyzes the permissions.Then,it builds directed information flow model according to the privacy points.By tracking the flows of the points,the information flows are monitored and the privacy leakages are detected.We tested 7 985 applications and detected 357 privacy leakage ones.We analyzed one of the results and confirmed that it was indeed a privacy leakge appliction.The results show that this new approach has good detection capacity

Effects of Temperature on the Proton Diffusion of Doped Ni(OH)_2

应用微电极恒电位阶跃法研究了在Ni(OH) 2 电极的阳极及阴极过程反应中 ,温度对球形Ni(OH) 2 的质子扩散系数和表观扩散活化能的影响 .研究表明 ,于Ni(OH) 2 中掺杂Co和Co +Zn后可降低其阳极和阴极过程的表观扩散活化能 ,增大质子扩散系数 ,掺Co的效果更加明显 ,而掺Zn则增大表观扩散活化能 ,降低了扩散系数 .这说明前者的掺入其作用是降低了质子扩散阻力使电极的反应活性增加、而后者的掺入则是增大了质子的扩散阻力而使电极反应活性降低 .The Chronoamperometry of powder spherical Ni(OH) 2 microelectrode was used to study the proton diffusion coefficients of Ni(OH) 2. The proton diffusion coeefficients and the apparent diffusion active energy in anode and cathode processes at different temperature were obtained. Compared with pure Ni(OH) 2, the apparent diffusion active energy( E a) of Ni(OH) 2 doped with Co and Co+Zn was decreased and the diffusion constant( D o) was increased in the anode and the cathode processes, respectively, the effect of Co was greater. In contrast, for Ni(OH) 2 doped with Zn, its E a was increased and D o was decreased. Therefore, it was concluded that the reaction activity of Ni(OH) 2 electrode doped by Co was enhanced due to the reduction of proton diffusion resistance, while the reaction activity of electrode doped by Zn was weakened due to the increase of proton diffusion resistance.作者联系地址：天津大学化工学院!天津300072,天津大学化工学院!天津300072,天津大学化工学院!天津300072Author's Address: School of Chem. Engin. and Techn., Tianjin Univ., Tianjian 300072,Chin

SOI光波导器件和集成光开关矩阵的研究进展

SOI(Silicon-on-insulator, 绝缘衬底上的硅)是一种折射率差大、波导传输损耗小的新型材料, SOI基光电子器件具有与微电子工艺兼容、能够实现OEIC单片集成等优点, 近年来受到越来越多的重视. 文中重点研究了SOI波导器件的新进展, 采用高效数值模拟方法研究得出了精确的SOI矩形和梯形大截面脊形波导的单模条件, 设计和制作了单模脊形光波导、多模干涉耦合器(MMI)、可变光衰减器(VOA)、马赫-曾德尔干涉型2×2热光波导光开关, 在此基础上首次研制出4×4和8(8 SOI平面集成波导光开关矩阵

宇宙黑暗时代探路者−鸿蒙计划

低频射电探测任务构想——鸿蒙计划旨在利用多颗卫星绕月编队形成超长波天文观测阵列，在月球背面开展空间低频射电天文探测。其科学目标是高精度测量全天射电频谱，揭示宇宙黑暗时代与黎明的演化历史；实现首次高分辨率超长波巡天，打开最后一个电磁窗口；观测太阳和行星超长波活动，揭示空间环境相互作用规律。该任务将获得超长波频段全天空图像，获取超长波波段天文射电源的强度、频谱、分布等信息。这些科学数据对于探索宇宙黑暗时代和黎明时代、研究银河系星际介质、宇宙线起源与传播、河外射电星系、类星体和星系团的演化、太阳活动与行星磁场等，具有重要的科学价值