《大戴礼·夏小正》所用历法考证

<大戴礼·夏小正>所用历法,迄今主要有"十月太阳历"、"殷历"和"夏历"等三种观点.比较<夏小正>与<礼记·月令>,它们记载的物候相一致的情况居多;测算星宿的距度.可推知<夏小正>与<月令>记载的正月、三月、五月、六月和八月的星象皆一致.可见,<夏小正>与<月令>使用的历法大体相同.另,<月令>与<淮南子·时则训>记载的星象亦一致,且<淮南子·时则训>中斗建寅这一星象为夏历的主要标志,可见<月令>使用的是夏历,而<夏小正>所用历法亦以夏历为主.     

Static group synchronization of second-order multi-agent systems via pinning control

This paper investigates the expected static group synchronization problem of the second-order multi-agent systems via pinning control. For directed communication topology with spanning tree, based on Gershgorin disk theorem and the matrix property, a static pinning control protocol with fixed gains is first introduced and some sufficient and necessary static group synchronization criteria are also established. It is worth mentioning that a rigorous proof is also given that only one pinning node is needed to guarantee static group synchronization, which could be inferred that our protocol might be more economical and effective in large scale of multi-agent systems. Then, for weakly connected directed communication topology with nodes of zero in-degree, an adaptive pinning control applied to the node with zero in-degree is also proposed to achieve static group synchronization. Finally, the efficiency of the proposed protocols is verified by two simulation examples.     

Model free adaptive iterative learning control for a class of nonlinear systems with randomly varying iteration lengths

This paper proposes a novel model free adaptive iterative learning control scheme for a class of unknown nonlinear systems with randomly varying iteration lengths. By applying the dynamic linearization technique along the iteration axis, such systems can be transformed into iteration-depended time varying linear systems. Then, an improved model free adaptive iterative learning control scheme can be constructed only using input and output data of the system. From the rigorous theoretical analysis, it is shown that the mathematical expectation of tracking errors converge to zero as iteration increases. This design does not require any dynamic information of the ILC systems and prior information of randomly varying iteration lengths. An illustrative example verifies the effectiveness of the proposed design.     

A cyclic pursuit framework for networked mobile agents based on vector field approach

This paper proposes a pursuit formation control scheme for a network of double-integrator mobile agents based on a vector field approach. In a leaderless architecture, each agent pursues another one via a cyclic topology to achieve a regular polygon formation. On the other hand, the agents are exposed to a rotational vector field such that they rotate around the vector field centroid, while they keep the regular polygon formation. The main problem of existing approaches in the literature for cyclic pursuit of double-integrator multiagent systems is that under those approaches, the swarm angular velocity and centroid are not controllable based on missions and agents capabilities. However, by employing the proposed vector field approach in this paper, while keeping a regular polygon formation, the swarm angular velocity and centroid can be determined arbitrary. The obtained results can be extended to achieve elliptical formations with cyclic pursuit as well. Simulation results for a team of eight mobile agents verify the accuracy of the proposed control scheme.     

均匀带电圆盘近轴区域的电场

对于均匀带电圆盘(以下简称圆盘)在轴线上激发的电势和电场强度,许多文章都做了讨论,并得出简洁的计算式.但是轴线以外区域的电场(电势)如何计算未见讨论.本文以场叠加原理为基础,借助数学展开的办法对这一问题作一些定量研究.     

水族源流考（下篇）

通过对历史典籍、民俗风情及水书、水历等方面的分析研究和考证,水族是六千多年前就已生活在中华大地荆楚江淮地区的一个勤劳、坚毅、果敢、勇为的古老民族。其祖先就是帝喾高辛时期曾经担任“水正”和天文法要员的共工。     

基于OBE理念的电气工程专业应用型课程体系建设与教学实施改革

坚持需求导向,坚持OBE理念,坚持具有时代特色的课程观、教学观,针对当前课程体系建设存在的不足,统筹考虑课程体系、课程内容、课程资源、教学团队、教学方法、课程评价等要素。在探索实施过程中,邵阳学院电气工程及其自动化专业改革取得了初步成效,电气工程专业应用型课程体系得到构建,应用型人才培养的质量得到提高。     

LOGO!在教学楼电气系统控制中的应用

本文介绍了采用LOGO!代替继电器开关量控制，实现对教学楼电气系统中的插座、室内照明、走廊照明及电铃电路的自动与手动控制；并通过内部软件线路图分析，阐明LOGO!在时钟开关量控制中的优势。     

NETLAB-An Internet based laboratory for electrical engineering education

INTRODUCTION In electrical engineering, laboratory experience is an integral part of the educational process. In fact, the amount of resources required to design and con-struct innovative experiments for electrical engi-neering education is relevant, and the number of in-stallations is often limited due to economic factors (Corradini et al., 2001). As a result, the possibility of experimental training for all the students is extremely reduced. With the rapid progress of Internet technol…     

鲜切茭白短期贮藏过程中的电导率变化

新鲜茭白经切片等处理后,于冷藏(1℃)和常温(20℃)下包装贮藏,在贮藏过程中对两组切片的电导率进行测定,结果显示:随着浸泡时间的延长,电导率不断上升;在常温下,从第3d起,电导率迅速上升,而在冷藏条件下,前3d电导率持续下降,随后也迅速上升.在整个贮藏过程中低温贮藏下切片的电导率明显小于常温贮藏下切片的电导率.