具有复合周期磁场的电子回旋脉塞

本文从降低回旋脉塞中直流磁场的角度出发,利用线性伏拉索夫——麦克斯韦方程组,对通过静态复合周期磁场的弱相对论电子注与缓变圆波导中沿纵向作任意缓变的TE_(mn)模式之间的互作用机理,在理论上进行了详细的分析和讨论,导出了色散方程并作了数值计算。分析和计算表明,由于采用了静态复合周期磁场,其电子注与波互作用的不稳定性产生在电子回旋共振条件下,从而可以在不同的电子回旋空间谐波上工作而大大地降低直流磁场。     

粒子的镜象对称理论

本文证明了平均自旋和磁物同向,提出了恢复镜象对称的两个方案,并对它们进行了分析比较,发现它们是根本对立的,从而对CP联合反演提出了异议。     

Leukemia Attributable to Residential Magnetic Fields: Results from Analyses Allowing for Study Biases

Nearly every epidemiologic study of residential magnetic fields and childhood leukemia has exhibited a positive association. Nonetheless, because these studies suffer from various methodologic limitations and there is no known plausible mechanism of action, it remains uncertain as to how much, if any, of these associations are causal. Furthermore, because the observed associations are small and involve only the highest and most infrequent levels of exposure, it is believed that the public health impact of an effect would be small. We present some formal analyses of the impact of power-frequency residential magnetic-field exposure (as measured by attributable fractions), accounting for our uncertainties about study biases as well as uncertainties about exposure distribution. These analyses support the idea that the public health impact of residential fields is likely to be limited, but both no impact and a substantial impact remain possibilities in light of the available data.     

功率步进电机细分控制的环形分配器

本文介绍了一种适合于功率步进电机细分控制的环形分配器。     

磁处理对豌豆幼苗生长及生理的效应

用磁感应强度为0．01T的磁场处理豌豆种子或用该磁场处理的水浸种显著促进豌豆幼苗的营养生长，增加干物质累积量，而用同样磁场处理的水浇灌胚根已经伸出的种子则显著抑制幼苗生长及干物质积累。     

磁控RF-SIM卡的设计与实现

在非接触式手机移动支付日益盛行的背景下,结合智能卡、RFID、磁控等技术,提出一种磁控RF-SIM卡的设计和实现模式.该磁控RF-SIM卡由多芯片的硬件架构和多任务、多应用的卡操作系统软件架构组成.它为RF-SIM卡产品带来更大的竞争力,为推动手机移动支付的发展提供了有益的帮助.     

The Use of Telematics Devices to Improve Automobile Insurance Rates

Most automobile insurance databases contain a large number of policyholders with zero claims. This high frequency of zeros may reflect the fact that some insureds make little use of their vehicle, or that they do not wish to make a claim for small accidents in order to avoid an increase in their premium, but it might also be because of good driving. We analyze information on exposure to risk and driving habits using telematics data from a pay‐as‐you‐drive sample of insureds. We include distance traveled per year as part of an offset in a zero‐inflated Poisson model to predict the excess of zeros. We show the existence of a learning effect for large values of distance traveled, so that longer driving should result in higher premiums, but there should be a discount for drivers who accumulate longer distances over time due to the increased proportion of zero claims. We confirm that speed limit violations and driving in urban areas increase the expected number of accident claims. We discuss how telematics information can be used to design better insurance and to improve traffic safety.     

从中国古代农书看农事信仰

农业是人们赖以生存的物质基础。中国是一个有着上千年农业文明的国家,中国古代农书中记载着诸多农事信仰活动。农事信仰的背后始终贯穿着先民对天、地、人三者关系的理解。从祈农到种植宜忌等可以窥见先民在农事活动中驱疫避邪、祈丰纳吉心理。     

中国发展道路的创新驱动特征研究

中国经济腾飞和现代化建设的快速推进,引起了当代世界经济与政治格局的深刻变化,促使人们首先是西方学者反思促进这一历史巨变背后的深层原因。对中国发展道路的探讨,出现了被冠以＂中国模式＂的理论范式和学术争鸣。本文认为,中国发展道路的确具有其独特性,但遑论＂中国模式＂为时尚早。中国发展道路有其必然性和偶然性的因素,既有成功的发展经验,又有继续深化改革促进完善的地方。纵观中国几十年改革与发展的历程,不难发现,创新驱动是中国发展道路的典型特征。包含理论创新、制度创新和技术创新的创新体系既是中国发展道路形成的动力,也是不断走向成熟完善的动力。     

项目驱动法在软件项目管理课程教学中的应用

分析了软件项目管理课程教学中存在的问题,探索了项目驱动法在软件项目管理课程中的应用方法,将软件项目管理教学过程分为三个阶段：前期理论指导、中期项目驱动法的理论实践和后期理论升华,让学生在学习理论知识的同时运用管理工具进行实践,实现基于项目过程的软件项目管理知识的传授与演练。