非安全GSM网络监听平台的设计与DSP实现

。根据GSM网络的架构以及空中接口信号的特点,参考当前的科研成果设计了一种利用空中接口直接静默监听的方案,该平台能实现语音以及短消息的监听。本文分析了该方案的实现原理、硬件平台模块组成、接口设计、以及基带算法流程。最后通过DSP硬件平台仿真该算法流程,并根据算法解析的部分消息验证了该方案的可行性。     

驱动电压频率对荫罩式等离子显示屏的影响

研究了荫罩式等离子显示屏(SM-PDP)的驱动电压频率从100 kHz到250 kHz变化情况下,显示单元放电特性的变化.结果表明:随着驱动电压频率的提高,在相同的时间内放电次数增加,使产生的真空紫外辐射能量增加,可以提高显示的亮度,获得更高的对比度和灰度等级,同时壁电荷的积累减小,使单次放电反应变弱、放电效率降低,因而过高的驱动频率,也不能起到改善图像质量的作用;同时电极上的电流峰值减小,而其随时间的平均值增大,在设计驱动电路时,必须考虑其影响.因此在设计SM-PDP时合理的选择驱动电压的频率,可以使PDP的性能有很大的提高.     

Fault-tolerant rate-monotonic compact-factor-driven scheduling in hard-real-time systems

Considering the disadvantage of first-fit strategy in fault-tolerant rate-monotonic first-fit (FTRMFF) algorithm, we analyze the slack time of processors and the schedulability of periodic tasks in rate-monotonic (RM) algorithm. Then, the RM-based idleness factor and compact factor are presented to quantify the compact degree of tasks assigned to the same processor. In this paper, the novel fault-tolerant rate-monotonic compact-factor-driven (FTRMCFD) algorithm, which follows the principle of compact factor maximal when allocating the processors for tasks, is proposed. FTRMCFD algorithm makes every processor contain more tasks and get higher utilization to increase the schedulability performance of distributed systems. The simulation experiments reveal that FTRMCFD can reduce the number of required processors by up to 11.5% (with an average of 5.3%).     

三结砷化镓叠层太阳电池的光学匹配设计与分析

电流匹配是两端式多结叠层太阳电池设计中的关键和难点;同时,合理的吸收光谱分布将有利于电流匹配的获得。文章采用TFC光学薄膜仿真软件,模拟与分析了三结砷化镓太阳电池的多层减反射膜、顶电池窗口层和顶电池等功能层的吸收谱、反射谱和透射谱,以及对太阳电池吸收光谱的影响,结合太阳电池性能分析,得出了几何结构优化设计,可确保较好的电流匹配。     

独立学院“职业生涯规划与就业指导”课程的构建

文章从"职业生涯规划与就业指导"课程设置的意义、教学目标、课程体系的定位、课程体系建设原则、教学的方法、教学评价与教学管理等方面阐述了"职业生涯规划与就业指导"课程的构建。     

发电厂生产管理智能信息系统

在智能管理的理论、方法的基础上,提出了发电厂生产管理智能信息系统的实施方案．介绍了系统的设计目标、功能体系、系统网络结构与设备,以及系统软件的配置．该系统具有集成化、智能化、网络化的特点,可应用在电力企业生产管理智能信息系统．     

Radiolarian transfer function for paleo-primary productivity in the South China Sea

Basic data of radiolarian group and primary productivity were from 46 investigation stations of the South China Sea. The factor analysis of principal component and the least squares estimation in both linear regression and nonlinear estimation were applied to establishing the radiolarian transfer function for paleo-primary productivity in this sea area. The results show that the transfer function of nonlinear regression analysis for the radiolarian assemblage and primary productivity has much better parameters. Factors analysis has accumulating variance of 83.6% and communalities of more than 0.940347. Nonlinear regression analysis gives multiple correlation coefficient as 0.84888 and explained variance as 72.059%. The equation of transfer function is with an average estimated error of about 53.778 mg · C/m² · d, which is 14.69% in average observed values. Calculation accuracy is 85.31% for the system of transfer function.     

Pb, Sr isotopes in organic matter of Lower Tertiary hydrocarbon source rocks in Liaohe Fault Depression

The Pb, Sr isotopic compositions in organic matters (kerogen and soluble organic matter) of Lower Tertiary hydrocarbon source rock in Liaohe Fault Depression is first reported. There is a great variable rang of Pb isotopic compositions in kerogen, 206Pb/204Pb = 17.488-18.656, 207Pb/204Pb= 15.388-15.692, 208Pb/204Pb = 37.656-37.484. And soluble organic matters have a very stable Pb isotopic composition, that is 206Pb/204Pb = 17.424-17.601, 207pb/204pb= 15.376-15.448, 208Pb/204Pb = 37.620-37.870. Sr isotopic composition varies in the range of 0.747 59-0.716 79 in kerogen and of 0.709 67-0.747 59 in soluble organic matters that have a great range. It is shown that mantle fluid can influence organic matters and make them form hydrothermal hydrocarbon in the geoglogic environment of rift basin.     

筒仓内部压力及流场的数值模拟与实验验证

利用离散单元法研究了筒仓装卸料过程中的力场和速度场,以期揭示宏观力学行为的内在机理。文中首先介绍了离散单元法的基本原理,然后用物理模型实验测试和模拟了筒仓壁法向压力及物料流动过程,最后用离散单元法研究了筒仓内部压力和物料颗粒速度场,并探讨了颗粒密度和物料密度的影响。     

基于有限元的不同粗糙度裂隙等效渗透性预测

含裂隙岩体的渗透性预测是分析油气开采、污染物迁移等渗透问题的基础。采用自行编写的子单元程序来求解不可压缩黏性流体的稳态Navier-Stokes流动方程,通过引入周期性边界条件(periodic boundary conditions, PBC)来消除以往的数值模拟中仅选用一小段裂隙而忽略裂隙延伸长度所产生的误差,并采用该方法探究了节理面粗糙度系数(joint roughness coefficient, JRC)、裂隙宽度以及裂隙两表面相互错动对裂隙渗透性的影响。结果表明：随着裂隙宽度的增大,JRC值对渗透性的影响减小;仅使用JRC值无法精确评估裂隙的渗透性。