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It is often desirable to represent carrier distribution systems by networks so that analysis can be made to predict the behavior of these systems. Modeling of two canonical carrier distribution systems, the star-shaped system and the parallel-wire system by networks was carried out in this paper. The representation is given in terms of lumped parameters when the lengths of the carrier lines are short and it is given in terms of lumped and distributed parameters when the lengths of the carrier lines are long. 相似文献
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采用政策分析法分析与我国体育彩票销售体系相似,经销商遴选方式趋同的部分国家和地区的体育彩票业经销商遴选政策,具体包括新加坡、
美国、西班牙、澳大利亚、新西兰、加拿大6 个国家及地区,寻找不同国家和地区政策分析的规律性特点,即均有基本资格审核,注重道德品质和遵纪守
法;注重是否具备营销、管理能力;要求体育彩票经销商有运动兴趣和博彩知识;将经销人员培训纳入彩票业务体系之中;重视经销地点选择和店面规
格;技术供应商执照与经销商执照不得同有。在分析其特征的基础上,与国际体育彩票经销商政策比较发现,得出对我国现行体育彩票经销商政策的
借鉴和启示,目前我国体育彩票经销商遴选仍有许多相关内容的考量值得借鉴和参考,即关于经济利害关系人的考量;关于运动兴趣和体育专业知识
的考量;关于“负责任博彩”的考量;关于推行“体育彩票经理人”职业资格认证制度的考量;关于技术供应商执照与经销商执照不得同有的考量,通过
部分国家或地区体育彩票经销商遴选政策分析研究,希望能够为我国体育彩票业经销商遴选政策的完善与发展提供智力支持和学术支撑。 相似文献
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A theory is developed to describe the propagation of characteristics waves through an infinite slab of irregularities in a magneto-ionic medium. The theory makes use of the asymptotic Green's dyadic. The results show that mode conversion is possible through scattering from irregularities in an anisotropic background. Some special cases are discussed and an example is given. 相似文献
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Chien-Hua Hsiao Ying-Tien Wu Chung-Yen Lin Terrence William Wong Hsieh-Hai Fu Ting-Kuang Yeh Chung-Yen Chang 《Learning Environments Research》2014,17(3):389-399
This study aimed to develop an instrument, named the inquiry-based laboratory classroom environment instrument (ILEI), for assessing senior high-school science students’ preferred and perceived laboratory environment. A total of 262 second-year students, from a senior-high school in Taiwan, were recruited for this study. Four stages were included in the development of the ILEI: (1) item formulation, (2) content validation, (3) construct validation and (4) reliability calculation. The study revealed that the ILEI was valid and reliable. Most students showed a preference for a student-directed and teacher-guided hybrid learning environment. The development of the ILEI is likely to help researchers and teachers to more effectively understand student views of the laboratory classroom environment. Our profound hope is to utilise ILEI to improve teachers’ assessment and students’ learning in inquiry-based laboratory classroom environments. 相似文献
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Liu Tzu-Chien Lin Yi-Chun Wang Tzu-Ning Yeh Shih-Ching Kalyuga Slava 《Educational technology research and development : ETR & D》2021,69(2):1183-1200
Educational technology research and development - Redundancy effect has been investigated in many controlled experimental studies, however, it is seldom investigated whether the same redundant... 相似文献
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Aesthetics has been regarded as a fundamental personal value. Most of the previous studies regarding aesthetic experience (AE) have focused on fine arts, rather than the everyday arts that are closely related to our everyday life. This study analysed the relationships among aesthetic life experience, expertise and different types of AE outcomes (aesthetic judgement and emotion) inspired by everyday designed products. The participants in this study were 115 college students, and an E‐prime program that included 120 pictures of designed products were employed to measure aesthetic judgement (beautiful, ordinary, or ugly) and aesthetic emotion (fearful, disgusting, neutral, or pleasure). The results revealed three major phenomena. (1) Two major types of AE outcomes are perceiving beauty with positive emotion and perceiving ugliness with negative emotion. (2) Although there are similar patterns for how aesthetic life experience and expertise influence personal tastes regarding beauty and aesthetic emotion, abundant expertise in designed products contributes more in differentiating emotion when viewing the beautiful designed products. (3) The consensus of the evaluation of ugliness is stronger than when evaluating beauty. In addition, a model of AE with regard to everyday designed products was proposed. The findings of this study shed light on the cultivation of aesthetic abilities and product design that could be utilised in education. 相似文献
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Yi-Chia Cheng Hsin-Te Yeh 《British journal of educational technology : journal of the Council for Educational Technology》2009,40(4):597-605
This paper explores the concepts of motivation, including extrinsic motivation and intrinsic motivation. It describes how motivation becomes a major concern in the field of instructional design (ID). Furthermore, a motivation model—the ARCS model—is identified and discussed. Finally, it provides an example of how to apply the motivational design process in ID. The aim of this paper is to facilitate a deeper understanding of motivation and to inform professionals about its importance in learning 相似文献
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This study integrated collaborative problem-based learning (collaborative PBL) with blended learning to explore the emerging process and function of online learning communities among preservice teachers. Thirty-two preservice teachers participated in a 16-week instruction program. Analyses of online group discussions and portfolios found that (a) the integrated approach facilitated the preservice teachers’ formation of online learning communities; (b) the preservice teachers’ online learning communities emerged via four stages: motivation and acquaintance, socialization and belongingness, information exchange and consensus, and tacit understanding and development; and (c) six factors influenced the development of the preservice teachers’ online learning communities. 相似文献
10.
以粒子蜂群网络建立高性能混凝土坍落度模型 总被引：1，自引：0，他引：1
以粒子蜂群算法(particle bee algorithm, PBA)结合神经网络(artificial neural network, NN),发展出一套能预测高性能混凝土(high performance concrete, HPC)坍落度模型的方法。以演化运算树(genetic operation tree, GOT)及倒传递网络(back propagation network, BPN)2种已发表的方法来比较其准确度。从模型的准确度可知,粒子蜂群网络(particle bee neural network, PBNN)模型预测的准确度高于GOT,但接近BPN的准确度;从参数的影响性可知,PBNN显示水、强塑剂、粗骨材、细骨材、粉煤灰及水泥添加量对于HPC坍落度的影响性大,而高炉矿渣粉用量对HPC坍落度并不敏感,显示各项材料对于坍落度的影响仍具备高度复杂性。 相似文献