全球化对高校德育的挑战及对策

在全球化及中西文化价值观的激烈冲突的背景下,高校德育对象的价值观发生了重大变化,这给高校德育工作提出了挑战。德育教师要树立教育国际化观念;高校德育以弘扬中华优秀文化为己任;推进德育创新,把德育的视野从智力领域扩展到非智力领域;运用现代科学技术,进行德育手段的创新。     

比较教育研究的基本范式述评

本文根据历史线索对比较教育研究领域中的三种范式：科学主义的研究范式、批判理论的研究范式和解释学的研究范式，进行了大致的厘定和评价，试图展示该领域理论形态和研究策略的整体景观。同时，就各自理论话语所处的特定语境作简单的分析，并倡导各自间不应是相互对峙与攻讦，而是要彼此间抱宽容和理解态度，不是苛求于整合而是要寻求互补。     

Header error control schemes for coping with upstream channel noise in the HFC network

The Hybrid Fiber-Coax (HFC) network is being paid close attention to in recent years as a bi-directional broadband access network. To achieve seamless connection with the backbone network, and Asynchronous Transfer Mode (ATM) Network Network Interface (NNI) cell format is used as the basic transmission packet unit in the HFC system. As the transmission condition of the HFC system’s upstream channel is bad, two improved header error control (HEC) schemes, i. e. the improved HEC and the cell interleaving technique, are employed to guarantee the packet integrity. Theoretical analysis of the results showed that the improved HEC and the cell interleaving technique are applicable to isolated random errors and burst errors, respectively.     

优美图的若干性质

刻划了优美图的基本性质 ,给出了某些优美图的具体标号。     

长尾理论视角下的旅游电子商务产品营销研究

对旅游电子商务在线营销发展阶段的科学判断有助于当前旅游目的地城市转型升级.以国内15个城市共计574件在线旅游产品的销量为因变量指标,将旅游目的地在线产品价格、种类以及评论情况作为自变量指标,立足于长尾理论并利用STATA回归分析方法,对旅游目的地产品在线销售影响因素进行分析.研究结果显示,百分法和绝对法两种定义法之下表现出长尾效应的目的地城市多集中在东部沿海地区,其中广州在两种定义法下均表现出显著的长尾效应.头、尾部市场销售影响因素对比分析表明,尾部市场受种类以及评论数的积极影响更小,受价格因素的消极影响更大.     

Novel high torque bearingless two-sided rotary ultrasonic motor

Applications are limited at present because the currently available ultrasonic motors (USMs) do not provide suffi-ciently high torque and power. The conventional travelling-wave USM needs the bearing to support, which required lubricant. To solve the above problem, a bearingless travelling-wave USM is designed. First, a novel structure of the two-sided USM consisting of a two-sided teeth stator and two disk-type rotors is designed. And the excitation principle of the two-sided travelling-wave USM is analyzed. Then, using ANSYS software, we set up the model of the stator to predict the excitation frequency and modal response of the stator. The shape of the vibration mode was obtained. Last, the load characteristics of the USM are measured using ex-perimental method. The maximum stall torque and the no-load speed were obtained. The results showed that the characteristics of the two-sided USM are better than those of the conventional one-sided USM.     

网络产品、信息产品、知识产品和数字产品的特征比较分析

虽然网络产品、信息产品、知识产品和数字产品的概念已经广泛被人们接受,但是关于这几种产品的概念、特征却一直没有一个明确的认识,而且由于这几种产品的相似程度比较高,容易在概念上引起混淆,这在一定程度上造成了网络产品市场、信息产品市场、知识产品市场和数字产品市场的混乱。因此对网络产品、信息产品、知识产品和数字产品的概念进行界定、区分和分类,研究它们共性特征和异性特征,这对于研究这些产品的市场规律具有重要的现实意义。     

Event triggering power sharing control for AC/DC microgrids based on P -F droop curve method

The power sharing of AC/DC micro-grids is researched in this paper. The proposed strategy mainly include two parts: the primary power event triggering control with secondary control and an adaptive quasi sliding mode voltage control in inner-loop. Firstly, a event triggering power sharing control (ETPSC) based on $P?F$ droop curve is developed to regulate the voltage and frequency of AC and voltage of DC with the aim of the proportional power sharing between AC and DC micro-grids. The triggered threshold of ETPSC can be chosen to decide the transmitted power between AC and DC micro-grids. When the difference power between AC and DC micro-grids is less than the triggered threshold of power flow, there is no power sharing between AC and DC micro-grids, which can less the number of switching the power flow direction and the transmitted line power loss. The ETPSC has a great robust for the disturbances of load and improve the stability of the system. An adaptive quasi-sliding-mode control,which is implemented easily and flexibly with small computational burden and only based on input/output (I/O) measurement data but not the model any more, is used to control voltage in inner-loop. The effectiveness of the proposed control schemes is demonstrated by some numerical simulations and experimental results.     

工程伦理决策策略分析

工程伦理决策问题是工程伦理学的核心问题，其具体体现在与工程相关的个人层面、专业层面、组织层面和社会层面。本文通过对美国工程伦理决策策略的具体分析，试图为建构一个沟通多种层面的工程伦理决策体系提供一点启示。     

基于Java的网络即时通讯系统设计分析

网络即时通讯系统是为了满足异地用户之间必要的网络通讯而设计的一套系统，是在通讯双方认可的条件下进行即时的文字交流和文件交流．本文从用户、已实现的应用程序源代码的角度分析系统的应用需求、功能模块、系统数据库、通讯机制设计和源代码的结构。