The design of the true random number generator based on the nuclear decay

随着计算机技术的发展和普及,数据安全越来越受到人们的重视,几乎所有的密码系统都需要不可预测的密钥进行加密,因此,如何快速得到真正的随机数成为当前人们迫切解决的问题。 核衰变信号是自然界的真随机源，由核衰变得到的序列虽然是真随机序列但却不能满足均匀性和独立性要求。因此必须利用软件的方式加以优化。本文采用与伪随机序列异或方式对其进行优化。为了最大限度利用所得真随机数，笔者用VB开发了远程访问真随机源且能嵌入Web使用的控件。 本设计的关键技术在于核衰变信号的引入和获取及对输出的随机序列进行均匀性和独立性的处理，以及可以远程访问真随机源且能嵌入Web使用的控件设计。本文解决该课题主要做以下几个方...With the development of the computer technolegy, data safety is more and more important to us. Almost all code system require unpredictable key to encrypt data ,Therefore how to acquire true random number become a urgent problem to people. Nuclear disintegration signal is the natural source of the true random number, the true random sequence acquired form nuclear disintegration is the true rand...学位：工学硕士院系专业：物理与机电工程学院物理学系_微电子学与固体电子学学号：2005130168

The Design Of The True Random Number Generator Based On The γSpectrometry Measuring

本文介绍了一种基于γ能谱测量的真随机数发生器的设计,详细阐述了设计思路。以核脉冲信号作为真随机源,引进伪随机序列进行优化并对结果进行了检测分析。This paper introduces a design of true random number generator based on the γspectrometry measuring, particularly describe the design methods.The acquisition of the true random number is based on the nuclear signal pulse.We introduces the pseudo random number sequence to raise the quality of the random numbers and give the analysis of the result

多壁碳纳米管负载铂的甲苯加氢脱芳催化剂

以多壁碳纳米管(CNTs)为载体制备了负载型Pt催化剂Pt/CNTs并将其用于催化甲苯加氢脱芳(HDA)反应.结果表明,在1.0%Pt/CNTs催化剂上,在0.4MPa,373K,PhCH3/H2摩尔比=6/94和GHSV=120L/(h.g)的反应条件下,甲苯转化率可达100%,比反应速率为0.0523mmol/(s.m2),分别是γ-Al2O3和AC负载各自最佳Pt负载量催化剂1.4%Pt/γ-Al2O3和2.4%Pt/AC上相应值的1.17和1.18倍.甲苯加氢产物全部为甲基环己烷,其他可能的加氢产物均在气相色谱检测限以下.催化剂的表征研究揭示,用CNTs代替γ-Al2O3或AC作为载体并不会引起所负载Pt催化剂上甲苯HDA反应的表观活化能发生明显变化.与γ-Al2O3或AC负载的相应催化剂相比,一方面,CNTs负载的Pt催化剂易于在较低温度下还原活化,并且其工作态催化剂表面催化活性Pt物种(Pt0)所占表面Pt摩尔分率有所提高;另一方面,CNTs负载的Pt催化剂对H2具有较高的吸附/活化和储存能力.这些促进效应对催化剂HDA活性的提高都有重要贡献

基于统计抽词和格律的全宋词切分语料库建立

全宋词切分语料库的建立是计算机研究宋词的基础。本文对宋词中“词”的界定提出了自己的看法,并在综合考虑统计抽词方法和基于诗词格律切分方法各自优点的基础上,提出建立全宋词切分语料库的新方法。我们首先通过统计抽词来抽取结合程度较强的二字词,并结合相关资源建立词表;在此基础上,结合宋词的格律特点按照一定的规则来对全宋词进行了切分。实验证明,本文中的方法具有较好的效果。国家自然科学基金资助项目(60373080

Purification of Multiwalled Carbon Nanotubes and Characterization of Their Oxygen-Containing Surface Groups

Corresponding author. Email: [email protected].[中文文摘]用兼具酸性和氧化性的HNO3水溶液可方便地除去残留在原生态多壁碳纳米管(CNT)上的Ni-MgO催化剂组分,同时在其表面产生某些含氧官能团,使原生态多壁碳纳米管的疏水性表面变为亲水性表面.采用Boehm中和滴定法以及X射线衍射(XRD)、热脱附谱(TPD)、傅里叶变换红外(FTIR)光谱和X射线光电子能谱(XPS)等技术对HNO3处理过的多壁碳纳米管的相组成和表面含氧官能团进行测量和表征.结果表明:所生成表面含氧官能团的总量以经7.0mol·L-1硝酸378K处理24h的CNT为最高;3种主要表面含氧官能团的含量高低顺序为,羧基>内酯型羧基>酚型羟基.[英文文摘]We conveniently removed the Ni-MgO catalyst components from an as-grown multiwalled carbon nanotube (CNT) using an aqueous HNO3 solution with strong acidity and oxidizability as a purifying reagent. Some oxygen-containing surface groups were generated at the CNT surface, which converted the hydrophobic surface into a hydrophilic surface. The phase composition and the oxygen-containing surface groups of the CNTs treated by nitric acid were determined and characterized using Boehm′s neutralizing titration method and X-ray powder diffraction (XRD), temperature-programmed desorption (TPD), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS) techniques. The results indicated that the total content of the formed oxygen-containing surface groups was the highest for the CNTs treated with 7.0 mol·L-1 aqueous HNO3 at 378 K for 24 h. The content of the three major oxygen-containing surface groups was: carboxyl>lactonic carboxyl>phenolic hydroxyl.国家重点基础研究发展规划项目(973)(2009CB939804);福建省重大科技专项专题项目(2009HZ0002-1

波部台湾东风螺对饵料的摄食和饵料蛋白质的消化率

厦门市夕阳红基金资助项

Office认证机制中密钥导出函数安全性分析

微软Office2007及其后续版本采用ECMA-376的文件加密格式,其安全性主要通过用户认证和文件加密实现,而密钥导出算法是整个安全机制的核心。为此,研究ECMA-376密钥导出算法的安全性,利用Game-Playing技术计算该密钥导出算法与随机函数的不可区分优势的上限。通过该理论和攻击实例对Office安全性进行分析,结果表明,当用户口令字符长度大于6时,Office具有一定的安全性

多壁碳纳米管及其对H_2吸附体系的Raman光谱

利用原位和非原位紫外 Raman谱法 ,对以 CH4 为碳源 ,由催化法制备的多壁碳纳米管( MWCNTs) ,K+-修饰的该类 MWCNTs,以及它们对 H2 的吸附体系进行了 Raman谱表征 ,观测到可分别归属于类石墨结构的基频模 D和 G以及它们的三阶组合频 ,表面 C-H3基和 C-H2 基等的特征Raman峰 ;H2 在这类碳纳米管上的吸附态包括解离吸附生成表面 C-H3和非解离吸附分子氢 H2 ( a) ;在相同实验条件下 ,K+-修饰体系上这两类氢吸附物种的表面浓度都比未经 K+-修饰的相应体系高

Pt catalyst supported on multiwalled carbon nanotubes for hydrogenation-dearomatization of toluene

Using home-made multiwalled carbon nanotubes (CNTs) as the support, the Pt/CNTs catalyst was prepared by an incipient wetness method. Performance of the catalyst for hydrogenation-dearomatization (HDA) of toluene was evaluated and compared with the reference catalysts supported on gamma-Al2O3 and activated carbon (AC). Over the 1.0 % Pt/CNTs catalyst under the reaction conditions of 0.4 MPa, 373 K, PhCH3/H-2 = 6/94 (mol/mol) and GHSV = 120 L/(h center dot g), the observed conversion of toluene HDA reached 100 %, and the corresponding specific reaction rate was 0.052 3 mmol/(s center dot m(2)). This value was 1.17 and 1.18 times that of the 1.4 % Pt/gamma-Al2O3 and 2.4 % Pt/AC catalysts with the respective optimal Pt loading, respectively. It was experimentally found that using CNTs in place of gamma-Al2O3 or AC as the support of the catalyst did not cause a significant change in the apparent activation energy for the toluene HDA reaction but led to a slight increase in concentration of catalytically active Pt species (Pt-0) at the surface of the functioning catalyst. In addition, the Pt/CNTs catalyst could reversibly adsorb a greater amount of hydrogen under atmospheric pressure at temperatures from room temperature to 573 K. This unique feature would help to generate a microenvironment with higher stationary state concentration of active hydrogen-adspecies at the surface of the functioning catalyst. These effects favored the toluene HDA reaction

魁蚶(Scapharca broughtonii)热休克蛋白90(HSP90)基因的克隆及转录表达分析

热休克蛋白90(HSP90)作为一种研究的常规免疫基因,在许多物种都有过报道。本研究从构建的魁蚶转录组文库中筛选得到的HSP90基因部分序列为基础,通过RACE技术获得其c DNA全长序列(命名为Sb HSP90),以期明确魁蚶HSP90基因的结构特征、组织分布及其对病原菌刺激的免疫变化规律。序列和结构分析表明,该c DNA全长2707bp,编码一个由728个氨基酸组成的多肽,该多肽含有HSP90家族共有的5个签名序列,C端高度保守的MEEVD短肽序列和ATPase结构域;预测蛋白的分子量(Mw)为83.72k Da,理论等电点(p I)为4.85;预测该蛋白无信号肽,具有4个糖基化位点。同源性及系统分析表明,Sb HSP90基因与软体动物的HSP90相似性达到83%以上,其中与长牡蛎(Crassostrea gigas)和海湾扇贝(Argopecten irradians)相似度最高达86%,与甲壳动物HSP90的相似度都在81%左右,与脊椎动物HSP90-α和HSP90-β的同源性都很接近。实时荧光定量PCR(q RT-PCR)结果表明:Sb HSP90 m RNA在魁蚶血细胞、斧足、鳃、外套膜、闭壳肌和肝胰腺和中均有表达,斧足中的表达量相对较高,而在肝胰腺中的表达量则相对较低;注射鳗弧菌后,相对于对照组,Sb HSP90基因在所检测的每个组织中m RNA水平上的表达量都显著上调(P<0.01),而且具有显著的时间依赖性和瞬时表达趋势。国家自然科学基金项目,31602142号;;中国水产科学研究院基本科研业务费项目,2017GH07号;;浙江省重中之重学科开放基金,KF2015007