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This work investigated the microwave dielectric properties of A-site substitution by rare earth La3+in(Pb0.5Ca0.5)(Fe0.5Ta0.5)O3(PCFT) system.A single perovskite phase was obtained only when the doping content was 2%.Suitable La3+ doping improved microwave dielectric performances.Excessive La3+doping caused the formation of secondary phase,which resulted in the decreasing of permittivity εrand quality factor Qfvalues.Especially,when the doping content is 2%-5%,permittivity εrwas above 75 and Qfvalues were 6... 相似文献
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INTRODUCTION Plants have defense mechanisms against patho-gen infection by inducing systemic resistance in re-sponse to localized pretreatment with biological cotrol agents, thus making them resistant to subsequpathogen infection (Caruso et al., 1999; Hammschmidt, 1999; Mohammadi and Kazemi, 2002; yada et al., 1995; Pozo et al., 2002; Ray et al., 199Biological control of plant pathogens has receivmuch more attention. It is well known that plants amicroorganisms symbiosis is a defense m… 相似文献
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摘要:分析休闲教育视域下基于我国老年休闲体育参加者在社会人口统计特征下的流畅感、休闲满意度和幸福感之间的差异及因果关系,为提升老年人的生活质量、幸福指数上升和促进老年人的休闲体育参与提供理论参考依据。运用因子分析、单因素方差分析、相关分析、结构方程等分析法对我国60周岁以上的530名老年休闲体育参与者进行了问卷调查。研究结果显示:1)流畅感在年龄、参与频度、参与项目、月收入方面均存在差异;2)休闲满意度在性别、年龄、参与频度、参与项目、月收入方面均存在差异;3)幸福感在年龄、参与频度、参与时间、参与项目、月收入方面均存在差异;4)流畅感对休闲满意度有着显著性影响,流畅感对幸福感无显著性影响,休闲满意度对幸福感有着显著性影响。针对性地对实施休闲教育提供理论参考与实践指导,有助于提高老年人的身心健康和成功老龄化及最大限度地提升晚年生活幸福指数,最终为国家减少医疗费用。 相似文献
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金孝真 《湖州师范学院学报》2008,30(6)
明清话本小说中所涉及的以江南地区为中心的地域社会大致可分为两个地区:一是所谓的江南地区,二是江南以外的地区社会.当时的江南对其他地区,在经济、社会风气、文化气氛等诸方面都产生了较大的影响,而且具有重要的文学研究价值.这种价值通过此一时期的话本小说可以反映出来.明代末期的地区社会与当时兴盛的商业经济有密切关系,那些商业经济又带动市镇的发展,而居于市镇的小市民就是话本小说中的主角,因此,话本小说能反映出当时市民的普遍的价值观和思想意识. 相似文献
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L. DIANNE BORDERS KIM K. BLOSS CRAIG S. CASHWELL LESLIE MARTIN RAINEY 《Counselor Education & Supervision》1994,34(2):172-179
The scientist-practitioner model was taught to counseling students by giving them an opportunity to integrate theory, research, and practice via a process research case study. 相似文献
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IntroductionTheHitchcock’sTransportationProblem(HTP)canbeformulatedasaclassiclinearprogrammingprobleminwhichthesetofconstraintsisofaspecialstructure[1,2].TheHTPisapracticaltransportationprobleminproductiondistributionsector.Alotofpracticaltrans-portationandassignmentproblems,suchastheminimumcostroadnetworktrafficflowproblemwithsolidchargeinlogistics,canbeformulatedinthisway,anditisclearlythattheHTPmaybehasmorethanoneoptimalsolution.Itisveryimportantforadecision-makertoselectafavorableone… 相似文献
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HONGNAM KIM 《Curator: The Museum Journal》1998,41(3):178-186
The article chronicles the tortured history of the National Museum of Korea, a history that, unfortunately, seems to exemplify the triumph of politics over scholarship as the primary factor guiding this museum's policy decisions. 相似文献
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Previously we have designed and implemented new image browsing facilities to support effective offline image contents on mobile devices with limited capabilities: low bandwidth, small display, and slow processing. In this letter, we fulfill the automatic production of cartoon contents fitting small-screen display, and introduce a clustering method useful for various types of cartoon images as a prerequisite stage for preserving semantic meaning. The usage of neural networks is to properly cut the various forms of pages. Texture information that is useful for grayscale image segmentation gives us a good clue for page layout analysis using the multilayer perceptron (MLP) based x-y recursive algorithm. We also automatically frame the segment MLP using agglomerative segmentation. Our experimental results show that the combined approaches yield good results of segmentation for several cartoons. 相似文献
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This letter proposes a categorization matrix to analyze the playing style of a computer game player for a shooting game genre. Our aim is to use human-centered modeling as a strategy for adaptive games based on entertainment measure to evaluate the playing experience. We utilized a self-organizing map (SOM) to cluster the player's style with the data obtained while playing the game. We further argued that style-based adaptation contributes to higher enjoyment, and this is reflected in our experiment using a supervised multilayered perceptron (MLP) network. 相似文献