用MAXⅡ CPLD开发人体反应速度测试系统

以Ahear公司MAXⅡ器件系列中的EPM1270T144C5为核心,以QuaausⅡ7．2为软件开发平台,实现人体反映速度测试系统。该系统通过复杂可编程逻辑器件（CPLD）实时采集测试信号,由开发的软件平台分析和处理采集信号,计算反应时间,显示于LCD。通过仿真和实际测试表明,该系统最小时间误差为10^-6s,测量精度高,稳定可靠。     

The Digital Age of Mobile Cellular Network in Germany and China：Policies,Technologies and Markets （Part Ⅱ）

The German Postal Reform I in 1989 introduced competition in the mobile cellular market. German cellular operators, DeTeMobil, Mannesmann, E-Plus and VIAG Interkom, built D1-, D2-, E1-and E2-Netze based on GSM standards made in Europe. China Unicom was created in 1994 and China Telecom was separated from MPT in 1995. China Telecom and China Unicom competed in a duopoly from the mid-1990s onwards and the cellular services provided by them also rely on GSM standards. China Telecom additionally deployed XLT technology (PHS) from the late 1990s onwards. While DeTeMobil and Mannesmann conquered approximately 80%-90% of the market throughout the 1990s and were the two dominant market players in Germany, China's cellular market was mainly controlled by China Mobile. In Germany, prices related to cellular technology continued the downwards trend as a major result of the process of deregulation, liberalisation and competition. In China, price wars had led to significant price reductions in the cellular market. Although network operators in both countries strived to deliver differentiated cellular services, the two national markets in the 1990s were visibly shaped by product homogeneity.     

The Digital Age of Mobile Cellular Network in Germany and China ：Policies,Technologies and Markets （Part Ⅰ）

The German Postal Reform I in 1989 introduced competition in the mobile cellular market. German cellular operators, DeTeMobil, Mannesmann, E-Plus and VIAG Interkom, built D1-, D2-, E1-and E2-Netze based on GSM standards made in Europe. China Unicom was created in 1994 and China Telecom was separated from MPT in 1995. China Telecom and China Unicom competed in a duopoly from the mid-1990s onwards and the cellular services provided by them also rely on GSM standards. China Telecom additionally deployed XLT technology (PHS) from the late 1990s onwards. While DeTeMobil and Mannesmann conquered approximately 80%-90% of the market throughout the 1990s and were the two dominant market players in Germany, China’s cellular market was mainly controlled by China Mobile. In Germany, prices related to cellular technology continued the downwards trend as a major result of the process of deregulation, liberalisation and competition. In China, price wars had led to significant price reductions in the cellular market. Although network operators in both countries strived to deliver differentiated cellular services, the two national markets in the 1990s were visibly shaped by product homogeneity.     

基于CycloneⅡ系列FPGA的DDFS信号源实现

直接频率合成技术为目前各种不同类型信号源设计的主要技术,本设计以QuartusⅡ为开发环境,利用VHDL语言,完成了正弦信号源的前端设计。并在CycloneⅡ系列EP2C35芯片上,不扩展外部存储器,时钟频率为40MHz的情况下,单片实现了频率步进为78Hz．频率范围为78Hz-1．25MHz的正弦信号源。     

带有交叉扩散项的Holling-typeⅡ捕食-食饵模型的共存

讨论了带有交叉扩散项的Holling-typeⅡ反应项的捕食-食饵模型在齐次Neumann边界条件下非常数正解的存在性.首先利用最大值原理、上下解方法和Harnack不等式对正解的上下界做了先验估计;其次在先验估计的基础上运用Leray-Schauder度理论证明非常数正解的存在性,并给出了正解存在的充分条件.     

配合物[Co（C6H4O2N）2（H2O）4]的合成与晶体结构

采用水热法,用氯化钻与异烟酸反应得到了分子式为[Co（C6H4O2N）2（H2O）4]的配合物,通过X-射线单晶衍射研究了其结构。该配合物的晶体属三斜晶系,空间群P-1,晶胞参数a=0．63736（19）nm,b=0．6921（2）nm,c=0．9282（3）nm,α=96．051（3）°,β=104．703（3）°,γ=0．113084（3）°,V=0．35454（18）nm^3,Z=1,Dc=1．757g／cm^2,Mr=375．20,F（000）=193,μ（MoKa）=1．257mm^-1,R1=0．0834,wR2=0．2302[I〉2σ（I）],晶体由具有六配位的畸变八面体结构的两性离子通过氢键和面．面π-π堆积构成。     

CITP-Ⅱ辐照装置的安全性及可行性研究

CITP-Ⅱ辐照装置是进行聚变能源产氚增殖剂辐照实验研究专用装置,以热中子反应堆为中子源。为确保设计的安全可靠,以正硅酸锂为目标增殖剂,计算了辐照装置装入反应堆后对反应堆物理参数的影响,分析了装置在n-γ混合场中的热工性能及增殖剂温度梯度,校核了装置部件的刚度及强度,对装置的安全特性进行了评估;论证了间隙气体调温和增殖剂气力驱动更换的可行性。计算数据和分析结果为辐照装置的综合特性评估提供了数据。     

基于Logistic总体Ⅱ型截尾样本分布参数的近似极大似然估计

为了研究Logistic总体的拟合优度检验问题等,讨论了基于Logistic总体Ⅱ型截尾样本分布参数的近似极大似然估计,得到如下结果:在样本大小足够大,样本双侧截尾比分别趋近于定值条件下,分布参数的近似极大似然估计存在、惟一、有界、且相合于真实参数;特别地,当样本双侧截尾比趋于同一定值时,估计量具有渐近正态性.     

参数独立可调的MOCCII电流模式滤波器

为了设计多功能电流模式滤波器和进行滤波器的调谐,提出了一种参数独立可调的二阶电流模式滤波器的信号流图及与之相应的MOOCII(多端输出的第2代电流传输器)电流模式滤波器.该滤波器由3个MOCCII、3个电容及4个电阻构成,能产生低通、带通、高通、带阻及全通滤波输出.滤波器的固有频率及品质因数等参数能独立可调,且具有很低的有源及无源灵敏度.对提出的电路进行了计算机模拟,结果证明提出的电路是正确的.     

基于ARM＋FPGA的终端重配置硬件平台实现

介绍了基于ARM和FPGA的端到端重配置终端的硬件平台设计方法。给出了系统设计的硬件结构和重要接口,提出了由ARM微处理器通过JTAG在系统配置FPGA的方法,以满足重配置系统中软件的灵活性要求。并详细介绍了JTAG在系统配置FPGA的时序要求。