基于Inception-V3网络的双阶段数字视频篡改检测算法

为了克服现有数字视频取证算法识别准确率低、定位能力差等缺点，提出一种具有高识别率且定位准确的基于Inception-V3网络的二级分类取证算法.在第一级分类器中提出简单的阈值判断方法来区分原始和篡改视频，第二级分类器将采用Inception-V3网络的稠密卷积核结构来自动提取篡改视频帧的高维多尺度特征.高维多尺度特征有助于提升篡改视频帧的识别率.实验结果表明，本文提出的算法不仅能准确地检测出篡改视频，还能从篡改视频中精确定位出篡改帧.     

Removal of Cr(VI) from wastewater by adsorption on iron nanoparticles

Due to rapid industrialisation, the presence of heavy metals in water and wastewater is a matter of environmental concern. Though some of the metals are essential for our system but if present beyond their threshold limit value (TLV), they are harmful and their treatment prior to disposal becomes inevitable. The present communication has been addressed to the removal of Cr(VI) from aqueous solutions by nanoparticles of iron. Nanoparticles of iron were prepared by sol–gel method. The characterisation of the nanoparticles was carried out by XRD and TEM analysis. Batch experiments were adopted for the adsorption of Cr(VI) from its solutions. The effect of different important parameters such as contact time and initial concentration, pH, adsorbent dose, and temperature on removal of chromium was studied. The removal of chromium increased from 88. 5% to 99.05% by decreasing its initial concentration from 15 to 5 mg L^?1 at optimum conditions. Removal of Cr(VI) was found to be highly pH dependent and a maximum removal (100%) was obtained at pH 2.0. The process of removal was governed by first and pseudo‐second‐order kinetic equations and their rate constants were determined. The process of removal was also governed by intraparticle diffusion. Values of the thermodynamic parameters viz. ΔG°, ΔH°, and ΔS° at different temperatures were determined. The data generated in this study can be used to design treatment plants for chromium rich industrial effluents. Adsorption results indicate that nanoiron particles can be effective for the removal of chromium from aqueous solutions.     

Electroactive PI sphere generated by electrospraying

In this study, electroactive polyimide microspheres (EPSs) based on conjugating segments of electroactive aminocapped aniline trimer as diamine and 4,4′‐(4,4′‐isopropylidenediphenoxy)‐bis(phthalic anhydride) as dianhydride were successfully prepared by electrospraying technology and characterized by time of flight mass spectroscopy, ¹H‐NMR, Fourier transform infrared spectroscopy and cyclic voltammetry. The prepared electroactive polyimide was then dissolved in a suitable organic solvent (N,N‐dimethylformamide; N‐methyl‐2‐pyrrolidone) followed by electrospraying treatment under four different operational parameters (i.e. solution concentration, applied voltage, feeding rate and deposition distance) to give EPSs of various diameters. Moreover, EPSs deposited on the Pt electrode were tested in a 1.0 mol L^?1 H₂SO₄ aqueous solution by cyclic voltammetry which showed an obvious redox peak similar to polyaniline. Copyright © 2011 Society of Chemical Industry     

氯乙烯/N-苯基马来酰亚胺/丙烯腈三元悬浮共聚

从氯乙烯／Ｎ－苯基马来酰亚胺／丙烯腈三元悬浮共聚的技术特点出发，研究了加料方式对聚合工艺及产物颗粒特性的影响，并在此基础上考察了引发剂体系的影响，确定了适宜的引发剂种类及用量。     

GSM/WCDMA双模手机测试系统PC部分的软件设计

着重介绍了GSM/WCDMA双模手机测试软件(DOLLY)PC部分的设计,详细描述了该软件PC端的相关线程,并对各线程之间的数据交换方式作了说明.该软件用于手机待机状态(idle mode)的信号测试,项目已进入系统调试阶段,与以往的测试方法和手段相比,其测试性能得到了较大的提高.     

超薄铜箔在HDI的应用

本文详细介绍了超薄铜箔的结构和制造方法，并对两种结构的超薄铜箔在HDI线路板的应用作了对比，研究了蚀刻速率和剥离强度特性以及图形电镀、激光钻孔的工艺，为超薄铜箔的实际应用提供了可靠的依据。     

关于测绘档案管理的几点思考

本文首先总结和归纳了在信息化时代测绘档案管理的现状。提出了档案管理工作中存在的资料不全,管理手段落后,存储设施不足以及管理无章可循等问题。并提出了应对措施。