毫米波矩形波导空心扭转工艺技术

通过对毫米波矩形波导扭转成型仿真与主要工艺参数的理论分析，确定了毫米波矩形波导空心扭转工艺流程。对利用该项工艺成型的波导电性能进行了测试，并对实测结果进行了分析与讨论。     

自激响应和起振条件

本文以ＣＲ桥式振荡器为例，说明不稳定网络自激响应的一般形式为复频率波ｅｘｐ。正弦振荡和脉冲边沿都是自激复频率波的特定情形。并且说明，正弦振荡器在起上位没有平衡，满足相位和幅值平衡条件的网络，有时也不能建立正弦振荡，而是表现为自激翻转。     

Fast movement strategies for a step-and-scan wafer stepper

We describe algorithms for the determination of fast movement strategies for a step-and-scan wafer stepper, a device that is used for the photolithographic processing of integrated circuits. The proposed solution strategy consists of two parts. First, we determine the maximum number of congruent rectangular chips that can be packed on a wafer, subject to the restriction that the chips are placed in a rectangular grid. Second, we find fast movement strategies for scanning all chips of a given packing, given the mechanical restrictions of the wafer stepper. The corresponding combinatorial optimization problem is formulated as a generalized asymmetric traveling salesman problem. We show how feasible scan strategies are determined, and how these strategies are improved by local search techniques, such as iterative improvement based on 2- and 3-exchanges, and simulated annealing based on 2-exchanges.     

芯片2817A与2864A的兼容探讨

本文针对以单片机8031为中央处理器的计算机系统中,芯片2817A与芯片2864A 的兼容问题进行了探讨,并介绍其硬件组成与软件结构。     

一种由555时基电路构成的多谐振荡电路

本文提出并较为全面地分析了一种555多谐振荡电路,推导并简化了振荡参数的计算公式。     

印制电路板的设计

详细阐述了印制电路板设计中的元器件分布,编号原则以及印制电路板尺寸、孔、连接盘、线的确定原则,可为技术人员进行完善的工程设计提供帮助。     

我国绿色农产业与世界农业同步

世界农业正在形成以生产和消费有机食品、形成农产品贸易中的“绿色壁垒”、开发绿色农业技术和开展农产品绿色营销为主的绿色浪潮,它比生态农业建设、生态环境保护的内涵要丰富得多。我国虽有发展绿色农产业的一定条件和基础,但在以发达国家为主导的世界农业绿色浪潮下,我国农业更多地是面临着冲击和挑战,为此,必须采取切实措实,发展我国绿色农产业,提高我国农产品的国际市场竞争力。     

Forecasting the output of integrated circuit industry using a grey model improved by the Bayesian analysis

The production values of the integrated circuit industry has the following attributes, short product life cycle, numerous influencing factors on the market, and rapid changing of technology. These features obstruct the precision of forecasting the outputs of integrated circuit industry using the traditional statistical methods. The grey forecast model can obviously conquer these difficulties with a small sample set and ambiguity of available information. This study evaluates original and Bayesian grey forecast models for the integrated circuit industry. Bayesian method uses the technique of Markov Chain Monte Carlo to estimate the parameters for grey differential function. The predictive value of integrated circuit in Taiwan was evaluated along with mean absolute percentage error. Various parameters and efficiency of three forecast models were compared and summary outcomes were reported. Meanwhile, the Bayesian grey model was the most accurate one among these models.     

《数字逻辑电路》教学改革的探索与实践

探讨了《数字电路》面向21世纪的教学体系、教学内容、教学手段、教学方法、教学空间、教学效果评估。探讨加强实践环节教学、培养“技能型、应用型、创新型、创业型”人才的有效途径。     

制度变迁与制度效率的波型特征的经济分析

由于制度效率存在递减规律,这就意味着当制度效率降低到一定程度时,制度的变迁是必要的.虽然制度具有内在的自然演进与变迁的动因,但制度变迁更重要的是在人为设计下进行.因为人为的制度安排或制度变迁更能及时地避免既有制度的效率损失,也可以获得新制度的更高的效率,从而实现社会各项资源在较高水平上的优化配置.