新教材带来新理念

本学期试验使用的高一政治新教材在科学的现代教育理念指导下,为培养学生的创新精神与实践能力搭建了很好的平台。一、创建平台,让学生自主学习著名教育家叶圣陶先生说过:“老师务必启发学生的能动性,引导他们尽可能自己去探索。”新教材新增加的和课文正文相配套的各种文字、图表资料及活动设计等内容,为学生自主学习提供了条件。例如,“知识窗”提供简短扼要的注释性知识,帮助学生理解课文中的知识点和基本概念;“经济观     

DPLL implementation in carrier acquisition and tracking for burst DS-CDMA receivers

This paper presents the architectures, algorithms, and implementation considerations of the digital phase locked loop (DPLL) used for burst-mode packet DS-CDMA receivers. As we know, carrier offset is a rather challenging problem in CDMA system. According to different applications, different DPLL forms should be adopted to correct different maximum carrier offset in CDMA systems. One classical DPLL and two novel DPLL forms are discussed in the paper. The acquisition range of carrier offset can be widened by using the two novel DPLL forms without any performance degradation such as longer acquisition time or larger variance of the phase error. The maximum acquisition range is 1/(4T), where T is the symbol period. The design can be implemented by FPGA directly.     

DPLL implementation in carrier acquisition and tracking for burst DS-CDMA receivers

INTRODUCTIONDS CDMAtechniquesplayanimportantroleincurrentHFCnetworksandwirelesscommuni cationsystems (Chungetal.,1993;Gaudenzietal.,1996 ;Viterbi,1997) .CrucialtotheDS CDMAsystemispropercodeandcarriersyn chronization .Literatureoncodesynchronizationisabun…     

上海市中学思想品德和思想政治新教材:在潜移默化中树人 在行动引导中成人

以学生生活为大背景,力求"说理"内容少而精新教材与一期课改的教材最大的不同是什么?新教材既继承了以往教材的优点,又在很多方面有了发展和创新。我们以"以学生为本"为出发点,以"素质教育"为指导,以"行动教育"为导向,以"实践活动"为突破口,编写这本新教材,希望该教材能有助于实现课程目标,有助于学生的自主学习,有助于教师的教学改革。     

An efficient training sequences strategy for channel estimation in OFDM systems with transmit diversity

INTRODUCTION Orthogonal frequency division multiplexing (OFDM) is now a popular technique for high data rate wireless communication. Due to its simple imple-mentation and attractive performance against fre-quency-selective wireless fading channels, it has been adopted in several wireless standards such as digital audio broadcasting (DAB), digital video broadcasting (DVB), IEEE 802.11a local area network (LAN), IEEE 802.16a metropolitan area network (MAN) and asymmetric digital s…     

社会资本与欠发达农村社区建设

社会资本理论具有的包容性和解释力为欠发达农村的社区建设提供了一个崭新的研究视角.文章从社会资本与农村社区建设的关联性出发,认为社会资本的流失与嬗变正是阻滞欠发达农村社区建设的关键,进而提出应从加强农民道德教育、培育农民公共精神、推进社区自组织建设以及发展集体经济和公共事业等层面重构社会资本,以推动社区建设可持续进行.     

思想政治课教学与信息技术整合的实践与思考

随着信息技术在教学中的广泛应用,教学内容的表现形式也会发生很大变化,将由原来的文本性、线性结构形式变为多媒化、超链接结构形式。在信息时代必须利用信息技术来加快思想政治课课程改革的力度和深度,使得思想政治课更快地适应信息社会的要求。同时思想政治课教学与信息技术的整合也使学生的主体地位得以真正确立,学习的自主性、能动性、合作性得到发挥,有利于培养学生的创新意识、创新思维和创新人格。     

政治制度化视角下的新生代农民工利益表达

一个社会所达到的政治共同体的水平反映了其政治参与的制度化与形成这种政治制度的各种社会势力之间的关系。新生代农F,,x-作为新兴的社会势力,其利益表达的制度化水平直接关系到社会的和谐与稳定。亨廷顿的政治制度化理论则为我们理解新生代农民工利益表达问题提供了一个较有参考性的视角。     

Time-domain clustered transmit power adaptation for OFDM system in fading channels

INTRODUCTION The growing demand for wireless multimedia services requires reliable and high data rate commu- nications over a wireless channel. However, the reli- ability is significantly limited by the ability of com- bating the intersymbol interference (ISI) introduced by the time dispersive nature of the wireless channel. Multicarrier transmission systems, especially OFDM systems, have aroused great interest in recent years as a potential solution to overcome ISI (Hanzo et al., 200…