Spatio-temporal Changes of Urban Thermal Environment with Thermal Centroid in Guangzhou

城市热环境及其变化与城市发展关系密切,热力环境的时空变化在一定程度上反映了城市发展的空间变化格局。通过构建热力重心转移距离、热力重心转移角度以及热力重心转移贡献率3个指数,计算3个不阶段广州市城市热环境的时空变化格局。结果表明,广州市1990~2005年高温地区的热力重心一直向南迁移。城市热力重心的转移路径与城市内部各地区在不同时期的发展及扩张具有一定的关系。The distribution and evolution of urban thermal environment are influenced by urban development.In this study,the concept of " thermal centroid" was given to describe the distribution of urban thermal environment in Guangzhou,and three indices about it were created,including thermal diversion distance,thermal diversion direction as well as thermal diversion contribution.It was showed that,the high-temperature thermal centroid transferred to the south of Guanghzou from 1990 to 2005.During 1990-2000,Panyu District made the greatest negative contribution to the transfer,but the positive contribution was made by Panyu District during 2000 -2005.国家自然科学基金项目(40571164)资

mtbuilder: a user interface toolkit for multi-touch tabletop

针对基于WIMP范式的图形用户界面工具不能解决多触点交互桌面的多指手势识别、界面组件朝向等问题,提出基于自然用户界面通用隐喻OCGM(objects,containers,gestures and manipulations)的多触点交互桌面界面工具箱——MTBuilder.首先用层次化多触点数据表示模型存储多触点数据,然后对多指手势识别器进行动态管理以加速识别处理,最后基于OCGM设计并实现界面组件库.通过多人信息浏览、城市规划等原型系统的开发和实验评估可以看出,MTBuilder能够为交互桌面界面构造与快速原型系统开发提供强有力的支持.国家自然科学基金(U0735004,60673188)|国家“九七三”重点基础研究发展计划项目(2009CB320804)|国家“八六三”高技术研究发展计划(2009AA01Z337,2009GJA00045)|浙江大学CAD&CG国家重点实验室开放课题(A1009)To address the issue in multi-touch tabletop that the WIMP paradigm-based graphical user interfaces could not handle multi-finger gesture recognition and UI component reorientation, this paper proposes a new multi-touch tabletop UI toolkit, termed MTBuilder, based on the universal foundational metaphors OCGM(objects, containers, gestures, and manipulations). First MTBuilder employs a hierarchical data representation model to store the multi-finger information. Then it configures the gesture recognizers dynamically to improve the efficiency of recognition. Finally design the components of the user interface based on OCGM. Several typical prototypes are developed, such as multi-user InfoScan and city planning. The prototypes and the experimental results showed that MTBuilder can efficiently support construction and prototyping of a tabletop user interface

THE ADVANCE OF MULTI-SCALE SIMULATION METHOD FOR MATERIALS AT NANO/MICROMETER SCALE

微纳米材料的力学行为正日益引起研究者的关注.微纳米材料的性能取决于从微观、细观到宏观多个空间、时间尺度上不同物理过程非线性耦合演化的结果,发展相应的多尺度数值模拟方法已成为该领域研究工作的一个热点.本文对微纳米材料模拟中比较典型的几种协同多空间尺度和协同多时间尺度方法进行了介绍,着重介绍这些方法的的基本思想、应用情况,以及各自的优缺点,并对微纳米材料多尺度方法的发展趋势进行总结和评

柠檬酸荧光碳点的合成及其在fe检测和细胞成像中的应用

以柠檬酸为原料,采用一步水热法合成荧光碳点。所合成的荧光碳点在310 nm激发波长下的荧光量子产率为5.3%,发射光谱随着激发波长红移而红移。透射电镜(TEM)表征显示荧光碳点在水溶液中分布均匀,平均粒径为2.9 nm。红外(IR)光谱和Zeta电位结果表明碳点表面有羧基和羟基等活性官能团。Fe(Ⅲ)对这些荧光碳点表现出选择性猝灭效果,这种现象可以用于Fe(Ⅲ)检测。在10 mmol/L的 HEPES 缓冲溶液(pH=7.0)中,荧光碳点的荧光强度随着Fe(Ⅲ)浓度的增加逐渐衰减。该方法对Fe(Ⅲ)测定的线性范围为100~500μmol/L,检出限为112.5 nmol/L。细胞成像结果表明,柠檬酸的碳点可进入到B16-F10细胞内,并在405 nm 和488 nm 激光照射下发出不同颜色的荧光。以上结果表明该碳点在Fe(Ⅲ)检测和细胞成像方面有潜在应用价值