18 research outputs found
貌合神离:中英文同款广告的符号和眼动分析
通过一系列中英文同款广告,该研究结合符号和眼动技术,指出相似的表象之下,微妙的细节调整如何折射出中西方读者对媒介内容叙述方式的不同偏好,以及处理群己关系的不同价值取向,从而呈现出“貌合神离”的警民、亲子、师生、夫妻、男女等社会关系。本文系国家自然科学基金项目“东西方不同文化思维方式对广告说服的影响:一个自下而上的脉络建构与验证”(项目编号:71372076)的阶段性研究成果
茨城県土浦市おおつ野におけるニュータウンの開発と変化
日本の高度経済成長期に「ニュータウン」と呼ばれる新興住宅地が郊外地域で多数形成された.今日,ニュータウンの課題として住民の高齢化や空き区画の増加などが指摘され,ニュータウンの再開発や再生が求められている.そこで本研究は,土浦協同病院の移転によって発展が加速する茨城県土浦市おおつ野を対象に,ニュータウンの再開発について考察した.聞き取りおよびアンケート調査を実施して,おおつ野の開発史,土浦協同病院の移転経緯,住民のライフコースと日常生活の変化を明らかにする.茨城県南部におけるニュータウンは,バブル崩壊後の都心回帰の傾向が強まる中で,東京大都市圏の郊外としての機能が低下し,地方都市の郊外として戸建住宅の用地を供給する役割を持つように変化した.その結果,おおつ野では空き区画が増加したが,土浦協同病院の移転により,商業施設が立地し,生活環境が改善され,ニュータウンとしての再発展が始まった.New residential areas called "new towns" have developed in the suburbs of Tokyo, Japan, since the 1960s. These new towns are now faced with such problems as an increased elderly population and growing numbers of vacant lots, and redevelopment is required. This study examines the redevelopment of the new town in Otsuno District, Tsuchiura City, Ibaraki Prefecture, where the relocation of the Tsuchiura Kyodo General Hospital triggered a new residential development. Interviews and questionnaire surveys were conducted in order to clarify the development history of Otsuno District, the reason for relocation of the hospital, and the changes in daily life for the residents. The characteristics of the new town changed from that of a bedroom community of the Greater Tokyo Metropolitan Area into a commuter town of Southern Ibaraki Prefecture after the collapse of Japan\u27s overheated stock and real estate markets, leaving Otsuno District with many vacant lots immediately after the collapse. However, the new town has been redeveloped since the relocation of the Tsuchiura Kyodo General Hospital, and the living environment has improved
Improved Subdivision Algorithm of Trapezium Examining Strip for Constraint Voronoi Diagram Generation
针对已有的限定Voronoi图生成算法在一些复杂约束条件下不能收敛的问题,通过引入控制因子,给出一种改进的限定Voronoi图梯形检测带细分算法。在计算初始Voronoi生长元的过程中,引入外部和内部限定线段端点保护圆半径控制因子,控制限定线段两端点附近的Voronoi边的尺寸;在细分梯形检测带的过程中,引入外部和内部限定线段尺寸控制因子,控制位于限定线段上的Voronoi边的尺寸。实验结果表明,本算法对于内部边界约束、线束约束条件以及不规则区域均可以得到质量较好、满足约束条件的限定Voronoi图
冻融循环作用后钢管混凝土界面黏结滑移本构模型研究
在北方寒冷地区,钢管混凝土结构因冻融作用侵蚀而造成钢管开裂以及钢管混凝土结构力学性能劣化从而导致结构破坏的事故时有发生。针对冻融侵蚀后钢管混凝土界面黏结性能问题,制作了钢管混凝土推出试件,考虑冻融循环次数、混凝土强度、钢管径厚比等不同参数,进行冻融试验和推出试验,分析了界面黏结力的分布规律和影响因素,研究了冻融循环作用后钢管混凝土界面黏结滑移本构关系,确定了界面平均黏结强度以及峰值黏结强度、残余黏结强度特征值。结果表明,随着冻融循环次数的增加,界面平均黏结强度减小,极限荷载对应的滑移逐渐增大,而残余黏结强度呈线性减小,稳定段起点滑移随着冻融循环次数的增加呈指数增长。峰值黏结强度、残余黏结强度随混凝土强度的增加而提高,随着径厚比的增大而降低。分析外钢管密布应变计所测出的应变分布规律可知界面黏结应力呈指数分布,对比分析由荷载、滑移结合能量法理论推导所得的黏结应力分布函数,结果表明其具有较高精度,为后期研究界面黏结性能提供了新思路。构建了冻融循环作用后界面黏结应力-滑移三段式本构模型,并提出了相应特征值计算公式和本构模型,可为该类构件设计时考虑冻融作用提供参考
冻融循环作用后钢管混凝土界面黏结滑移本构模型研究
在北方寒冷地区,钢管混凝土结构受冻融作用侵蚀,造成钢管开裂以及钢管混凝土结构力学性能劣化导致结构破坏事故时有发生。针对冻融侵蚀后钢管混凝土界面黏结性能的问题,制作钢管混凝土推出试件,考虑冻融循环、混凝土强度、钢管径厚比等不同参数,进行冻融试验和推出试验,分析了界面黏结力的分布规律和影响因素,研究了冻融循环作用后钢管混凝土界面黏结滑移本构关系,确定平均黏结强度以及峰值黏结强度、残余黏结强度特征值。结果表明,随着冻融循环次数的增加,界面平均黏结强度减小,极限荷载对应的滑移逐渐增大,而残余黏结强度线性减小,稳定段起点滑移随着冻融循环次数的增加呈指数函数增加。峰值黏结强度、残余黏结强度随混凝土强度的增加而增加,随着径厚比的增加而减小。分析外钢管密布应变计所测应变分布规律,可知界面黏结应力呈指数函数分布,对比分析由荷载、滑移结合能量法理论推导所得的黏结应力分布函数,具有很好精度,为后期试验研究界面黏结性能提供新思路。构建了冻融循环作用后界面黏结应力-滑移三段式本构模型,并提出了相应特征值计算公式和本构模型,为该类构件设计时考虑黏结-滑移提供了新支持
Machining Error Analysis of Freeform Surface Off-Axis Three-Mirror System Based on Optical Performance Evaluation
Blue Laser Diode Pumped Pr~(3+):YLF Visible Lasers
报道了蓝光激光二极管(ld)(中心波长约为444nM)单端纵向抽运掺镨氟化钇锂(Pr3+:ylf)的红光(640nM)和绿光(522nM)激光器。用单个棱镜作为抽运光束整形器,实验中红光最高输出功率为308.5MW,其相应的抽运阈值功率为46MW,斜率效率为47.5%;绿光这三个指标的值相应分别为193.4MW、162.3MW和37.1%。结果表明抽运光的整形提升了红、绿光的输出特性。Red(640 nm)and green(522 nm)lasers with Pr3+:YLF pumped by a blue laser diode emitting at about 444 nm in the longitudinal direction are reported.On the basis of the beam reshaping of the pump spot by aprism,the maximum output power,absorbed threshold pump power and slope efficiency of the red laser are 308.5 mW,46 mW and 47.5%,respectively.The three corresponding parameter values for green laser are 193.4 mW,162.3 mW and 37.1%,respectively.The results show that the shaped pump beam is beneficial to improve the output characteristics of these two visible laser emissions.国家自然科学基金(61275050); 博士点基金(20120121110034); 厦门市科技项目(3502Z20113004
大容量全控型压接式IGBT和IGCT器件对比分析:原理, 结构, 特性和应用
全控型压接式器件是大容量电力电子装备实现功率转换的核心,主要包括以集成门极换流晶闸管(integratedgate commutatedthyristor,IGCT)为代表的晶闸管类器件和以绝缘栅型双极晶体管(insulated gate bipolar transistor,IGBT)、注入增强栅极晶体管(injection enhanced gate transistor,IEGT)为代表的晶体管类器件。文中首先介绍并比较IGCT与IGBT(含IEGT)的芯片结构及制作工艺,然后分析对比IGCT与IGBT(含IEGT)的工作原理及封装形式。接着从工作频率、关断能力、动态耐受、器件容量、工作损耗、驱动功率、管壳防爆特性、失效短路特性、器件可靠性等9个角度出发,系统性分析不同全控型压接式器件的工作特性,最后对其应用现状及前景进行概述及展望。Fully-controlled press-pack devices are the core components of large-capacity power electronic equipment for power conversion, mainly including thyristor-like devices such as integrated gate commutated thyristor (IGCT), and transistor-like devices such as insulated gate bipolar transistor (IGBT) and injection enhanced gate transistor (IEGT). This paper firstly introduced and compared chip structures and manufacturing processes of IGCT and IGBT (including IEGT). Then, the working principles and packaging structures of IGCT and IGBT (including IEGT) were analyzed and compared. After that, the working characteristics of different fully-controlled press-pack devices were analyzed systematically from nine aspects including working frequency, turn-off capability, dynamic tolerance, device capacity, operating loss, gate driver power, housing package explosion proof, short circuit failure mode (SCFM), and device reliability. Finally, the application status and application forecast of fully-controlled press-pack devices were summarized and prospected
