2002年武术套路试行规则评分内容的相关分析   总被引：14，自引：1，他引：13  

何瑞虹 《北京体育大学学报》2004,27(10):1422-1424

针对2002年9月举行的"武术套路冠军赛"中新规则的试行,把新规则实施后所有自选项目的最后结果,与其中各个评价内容的评价结果进行对比,并进行相关分析;把各个部分评价的给、扣分情况进行统计比较.从而根据各个项目的特点、现状,某个部分在评定中的突出作用,以及评价体系中的权重等问题进行分析与探索.  相似文献   

Spread or Sacrifice: Dilemma for Lighting Policies     

Agnes Brokerhof  Pieter Kuiper  Steph Scholten 《文物保护研究》2018,63(5):28-34

ABSTRACT

Light sensitive objects will fade on display. Collection managers and curators face the dilemma whether to spread fading over several similar objects or sacrifice one. This paper describes an experiment in which participants were asked how they would want to pass on a collection of seventeenth century hand-coloured maps to coming generations. Results show that while colour changes are hardly visible, both public and professionals do not perceive them as damage and prefer to spread fading. Once fading becomes clearly visible in all maps, the preference shifts to sacrificing one map. The tipping point lies around five just noticeable changes. This information can be used when selecting objects for exhibition. The outcome also implies it would be prudent to assess the degree of fading of much exhibited objects and consider whether and when to choose for a sacrifice strategy.  相似文献   

FFH/MFSK系统抗干扰性能研究   总被引：1，自引：0，他引：1  

刘传清 《襄樊学院学报》2007,28(2):32-36

针对FFH/MFSK通信系统的特点,推导了在赖斯衰落信道下,多音干扰产生的虚警检测概率和漏检概率数学表达式,并研究了不同参数对系统BER性能的影响. 仿真结果表明,在多音干扰功率大于一定值时,多音干扰数量是造成系统BER性能下降的主要因素.  相似文献   

多径衰落信道中的RAKE接收机性能研究     

张晓蓉 《西安文理学院学报》2009,12(4):102-104

在移动通信中,分集接收是抵抗多径衰落的有效方法.文中对一种多径分集技术—RAKE接收机的原理进行了详细的描述,分析了其对多径衰落的补偿有效性.通过用MATLAB软件进行误码率仿真,可以看出,RAKE分集接收能收集多径信号能量,变矢量和为代数和,有效地减少多径衰落的影响,降低误比特率.检测中的分集重数L不超过路径总数时,分集重数L越大越好.  相似文献   

Concreteness fading in learning secondary school physics concepts     

《Learning and Instruction》2022

Concreteness fading has been proposed as a general instructional approach to support learning of abstract mathematics and science concepts. Accordingly, organizing external knowledge representations in a three-step concrete-to-idealized sequence should be more beneficial than the reverse, concreteness introduction, sequence. So far, evidence for the benefits of concreteness fading come mainly from studies investigating learning of basic mathematics concepts. Studies on learning natural science concepts are scarce and have not implemented the full three-step-sequence. In an experimental classroom study (N = 70), we compared concreteness fading and concreteness introduction in high school science education about electromagnetic induction using a detailed assessment. Furthermore, we explored whether these sequences differentially affect the use of the different representations during instruction. Both sequences were equally effective and there were no differences in using the representations. We discuss why our results question the proposed advantages of concreteness fading and highlight conceptual differences and learning goals across domains.  相似文献   

Concatenated Trellis Coding and CPM for DS/SSMA Communications in Rayleigh Fading Channel     

仰枫帆  梁树雄  毕光国 《东南大学学报》1999,(1)

本文在衰落信道下将级联网格编码调制（ＴＣＭ）和连续相位调制（ＣＰＭ）应用于直接序列扩频多址（ＤＳ／ＳＳＭＡ）系统中．作者分别采用了理论分析和数值模拟两种方法研究了级联ＴＣＭ／ＣＰＭＤＳ／ＳＳＭＡ系统的性能，结果表明在相同的条件下采用级联ＴＣＭ／ＣＰＭ编码调制方式的ＤＳ／ＳＳＭＡ系统的错误概率远小于采用单一ＴＣＭ或ＣＰＭ的ＤＳ／ＳＳＭＡ系统的错误概率．  相似文献   

一维同核化学位移相关谱的研究及其应用     

许小平 《科技通报》1994,10(2):105-105

从理论上分析研究了一维同核化学位移相关谱，并采用单片微处理机技术，首次在ＪＥＯＬＦＸ９０Ｑ核磁共振波谱仪上建立了一维同核化学位移相关谱方法，成功地测定了一些化合物的一维同核化学位移相关谱，得到了较好的结果。  相似文献   

关于Smarandache自相关序列     

乐茂华 《宁德师专学报(自然科学版)》2004,16(3):225-226

对于任何正整数n，给出了n重Smarandache自相关序列的明显公式．  相似文献   

Matlab在无线衰落信道教学中应用     

朱秋明  陈小敏  黄攀  徐大专  黎宁  宋晓勤 《实验室研究与探索》2013,32(8):60-63

提出一种基于Matlab的无线衰落信道教学演示平台。该平台首先引入不同类型调制信号通过无线信道环节,让学生直观地了解信道衰落对信号产生的失真影响;然后讲授不同信道衰落的统计特性及模拟产生方法;最后利用数值仿真获得不同通信系统性能。教学实践表明,该平台加强了学生对无线信道特性及对通信系统影响的理解,也调动了学生编程开发无线信道模型的积极性,为进一步学习通信理论奠定了基础。  相似文献   

在健美操运动中教练与练习者个性气质关联分析     

魏丽香 《惠州学院学报》2008,28(6):101-104

采用查阅文献资料、专家访谈、问卷调查、数理统计等多种方法,对健美操运动项目教与学双方个性气  相似文献