山东昌乐蓝宝石的谱学特征及呈色机理

昌乐蓝宝石的呈色是过渡金属离子的ｄ－ｄ电子跃迁电荷转移跃迁等因素共同作用的结果；蓝宝石呈何种颜色取决于蓝宝石晶格中Ｆｅ＾２＋，Ｆｅ＾３＋，Ｔｉ＾４＋，Ｔｉ＾３＋等色素离子的含量，更取决于这些离子的相对含量，亦即Ｆｅ＾２＋／Ｔｉ＾４＋，Ｆｅ＾３＋／Ｆｅ＾２＋的比值。     

基于一次U系统的商业票据防伪的数字水印算法

本文将一次U系统的正交函数系应用到商业票据防伪中,给出了一种新的数字水印算法.通过算法设计和仿真实验分析,该数字水印算法对票据防伪具有算法简单易实现,能够抵抗票据的涂抹、裁剪、JPEG压缩、加噪等攻击的特点.可适用于商业票据的防伪和认证.     

基于ILOG平台的求解动态车间作业调度问题优化算法研究

研究了基于约束规划和启发式搜索算法结合求解动态车间作业调度的问题。以最小化制造周期费用与总拖期惩罚费用之和为优化目标,通过建立调度模型、分析问题的优化特性,提出了基于约束规划的禁忌搜索启发式算法,根据与另外两种算法的比较结果,验证了此算法的有效性。     

偏馈式构架反射器展开冲击特性分析

As the off-fed truss reflector is connected to the platform by a single edge and deployed rapidly through being driven by the spring, the impact influence acts obviously on both the reflector and the platform. Due to limitations of the ground test, the in-orbit deployment impact characteristics of truss reflector are difficult to obtain. Then, by taking a certain reflector as the research object, a dynamic model is established with multibody dynamic software. Based on the modified model with ground deployable tests, in-orbit deployment impact characteristics are obtained by simulation analysis. Therefore, the method for multibody dynamic modeling is suitable for truss reflector dynamic research, and the result is useful for the deployable reliability optimization.     

Stress-dilatancy of Zipingpu gravel in triaxial compression tests

Experimental investigations of the dilatancy and particle breakage of gravelly material from the Zipingpu concrete-faced rockfill dam, which was subjected to high-intensity seismic load during the 2008 Wenchuan earthquake, were conducted through a series of large-scale drained triaxial compression tests. A hyperbolic relation between the input plastic work and the degree of particle breakage was found for Zipingpu gravel, independent of the initial void ratio and confining pressures. The stress-dilatancy for Zipingpu gravel was analyzed and compared with data from two rounded alluvial and three angular quarried gravelly and rockfill materials in the literature. A nearly linear relationship between the dilatancy D~p and the stress ratio η was found at medium-to-large stress ratios before the peak stress ratio. The slope of the stress-dilatancy line before peak had slight dependence on the void ratio and confining pressure of the gravel. After peak, the stress-dilatancy relation shifts down compared with that before peak for the gravel specimen. The phase-transformation stress ratio decreased with increased confining pressure, with the exception of sub-rounded gravel with little particle breakage. A nearly linear relationship was found between the phase-transformation stress ratio M_f and the state parameter y for the Zipingpu gravel, regardless of the void ratio and confining pressure of the specimens.     

过热蒸汽吞吐直井产能预测模型

随着过热蒸汽吞吐已经进入工业化应用,关于过热蒸汽吞吐产能的研究需求增加。在直井过热蒸汽吞吐加热半径计算模型基础上,将油藏内热区和冷区内渗流分开计算。冷区稠油由供给边界流向热区边界,热区稠油由热区边界流向生产井底。利用有界地层中心一口井不稳定渗流微分方程的拟稳态解得到产能模型。利用本文方法对库姆萨伊油田目标区块两个吞吐周期进行定油拟合计算,累计产水量计算值与实测值相对误差均小于0.5%。     

硬质合金钎焊接头的拘束强化

从力学观点分析了高温高压扩散处理硬质合金钎焊接头的拘束强化效应。文中指出，钎焊接头受力时，钎缝的拘束应力状态与双边半圆缺口平板中的应力状态相类似，据此，在一定范围内建立了钎缝宽度与接头强度间的定量关系，为通过控制钎缝宽度以提高接头强度提供了依据。     

图割综述

综述了图割的基本理论框架及利用图割解决问题时的主要流程和图割方法存在的难点问题.介绍了图割的发展状况及图割的应用领域,指出了其中的公开问题,并对图割未来的研究方向做出展望.     

基于单片机的FPGA/CPLD测试接口板设计

文中介绍了一种基于单片机的FPGA/CPLD测试接口板,通过该测试接口板将计算机与FPGA/CPLD的数字单元电路连接,可以在计算机上比较和分析数字单元电路的输入和输出,从而测试其电路性能。     

嵌入式系统中典型Cache一致性问题的解决

随着嵌入式系统CPU主频越来越快,与内存速度差距越来越大,Cache的使用对解决系统的瓶颈起到越来越重要的作用。如果不注意Cache一致性问题的处理,将会对系统软件运行造成难以预料的结果,甚至会导致系统的崩溃。