The characteristics and self-time-delay synchronization of two-time-delay complex Lorenz system

Time-delay is frequently encountered in a variety of practical chaotic systems, such as chaos-communication. The behaviours of time-delay chaotic system are greatly different from those of the original system. Self-time-delay synchronization (STDS) implies that the synchronization between the time-delay system and the original system while maintaining the structure and parameters of systems unchanged, thus these various problems produced by time-delay in practice are avoided. Firstly, we investigate the characteristics of two-time-delay complex Lorenz system. Then we take one-time-delay and two-time-delay complex Lorenz system as examples, and design their controllers to realize STDS. One-time-delay complex Lorenz system is a special case of two-time-delay. Numerical simulations verify the validity of the STDS controllers. The controllers only involve error, and it is easy to realize in practice. Moreover, the time-delay chaotic system exhibits highly stochastic behaviors and unpredictable properties, which can be applied to chaos-communication and enhance the security of communication.     

修订后的《档案著录规则》之新特点

本通过对新颁布的《档案录规则》（DA/T18-1999）和原《档案录规则》（GB3792.5-85）的比较，从中归纳出新《档案录规则》的新特点。     

Increased foot-stretcher height improves rowing performance: evidence from biomechanical perspectives on water

Abstract

The aim of this study was to investigate whether changes on foot-stretcher height were associated with characteristics of better rowing performance. Ten male rowers performed a 200 m rowing trial at their racing rate at each of three foot-stretcher heights. A single scull was equipped with an accelerometer to collect boat acceleration, an impeller with embedded magnets to collect boat speed, specially designed gate sensors to collect gate force and angle, and a compact string potentiometer to collect leg drive length. All sensor signals were sampled at 50 Hz. A one-way repeated measures ANOVA showed that raising foot-stretcher position had a significant reduction on total gate angle and leg drive length. However, a raised foot-stretcher position had a deeper negative peak of boat acceleration at the catch, a lower boat fluctuation, a faster leg drive speed, a larger gate force for the port and starboard side separately. This could be attributed to the optimisation of the magnitude and direction of the foot force with a raised foot-stretcher position. Although there was a significant negative influence of a raised foot-stretcher position on two kinematic variables, biomechanical evidence suggested that a raised foot-stretcher position could contribute to the improvement of rowing performance.     

高校图书馆中华传统文化立体阅读推广探究——以北京师范大学图书馆“二十四节气”阅读推广为例

[目的/意义] 以北京师范大学图书馆"二十四节气"传统文化立体阅读推广为例，探讨基于中华传统文化的高校图书馆立体阅读推广模式。[方法/过程] 论述高校图书馆开展中华传统文化阅读推广的意义及采用立体阅读模式的必要性，从活动准备、活动内容和特点、活动效果评价三方面阐述北京师范大学图书馆"二十四节气"传统文化阅读推广工作。[结果/结论] 提出高校图书馆以立体阅读模式开展中华传统文化阅读推广的策略。     

网络舆情衍进指数构建与实证分析

[目的/意义]提出和构建网络舆情衍进指数，以描述网络舆情演化过程中常衍生出新的子话题的现象，对于舆情预警、预测具有重要的理论及实践意义。[方法/过程]以文本聚类结果和文本聚类有效性为依据，提出网络舆情衍进的判别标准和舆情衍进指数的构建过程，并以"教科书老赖"这一事件作为样本数据进行实证分析。[结果/结论]所构建的舆情衍进速率指数可以用于描述舆情衍进。在突发期阶段话题舆情衍进指数最高，此后逐渐下降，这一阶段的舆情衍进最为剧烈，子话题的出现呈现爆发性增长；舆情衍进指数在舆情蔓延期内出现阶梯式下降，此后保持为负值，舆情的子话题开始逐渐减少，舆情内容本身由发散转为收敛；进入消散期后，子话题数量趋于稳定。作为舆情衍进速率的测度和舆情衍进的判别方式，舆情衍进指数为舆情监管和舆情预警提供了全新的角度。     

国家创新能力建设视角下国家图书馆企业信息服务策略研究

[目的/意义]从国家创新能力建设的角度研究国家图书馆企业信息服务，探索其在支持国家创新发展方面的作用。[方法/过程]采用文献调查法、网络调查法、案例分析法和访谈法，首先基于国家创新能力评价体系分析国家创新能力建设驱动的信息服务需求，其次分析英国国家图书馆支持国家创新能力建设的企业信息服务模式，然后调查我国国家图书馆支持国家创新能力建设的实践进展，最后提出其支持国家创新能力建设的企业信息服务策略。[结果/结论]我国国家图书馆支持国家创新能力建设的企业信息服务策略包括开展创新创业知识中心服务模式的研究，探索支持创新创业的企业信息服务模式，并在各地区推广支持地区创新发展的信息服务模式。     

构建终身学习社会:高校继续教育大有作为

高等学校继续教育在终身学习成为一种趋势的前提,在分析自身办学问题及其面临困境的基础上,积极探索继续教育学院发展的策略,从校企合作、中外合作、教育质量、师资队伍、教学管理制度、网络教育等方面进行改革与尝试,努力推进终身学习社会的构建。     

电大中专的发展形势与基本思路--在2003年全省中专招生工作会议上的讲话

一、国内中专教育发展的形势前几年中专招生比较困难 ,在前几次会议上我们都分析了原因 ,不外乎这样几种 :一是受国内整个经济环境的制约。国有企业设备更新 ,减人增效 ,一些行业职工纷纷下岗 ,尤其是国有企业职工的下岗 ,造成了有的学生觉得毕业就是失业。因而报中专的人少了。二是社会上盲目追求高学历 ,用人单位盲目追求高学历 ,哪怕一个简单的工作岗位也要本科生 ,不要中专生 ,造成了用人上的误区。三是大学扩招形成了普通高中热 ,上大学都这么容易了 ,学生念完中专又没人要 ,谁还上中专呢 ?四是有些媒体的宣传导向有偏差。有些媒体报道…