烘焙技术在X3D虚拟场景的应用研究

针对X3D虚拟场景的真实程度,从显示效果和文件大小角度研究烘焙技术在X3D虚拟场景中的应用,提出了在X3D虚拟场景中应用烘焙技术的操作方法,结合室内模型的地板烘焙实例阐述在建模、烘焙和导出X3D虚拟场景阶段的操作要点,验证了方法的可行性和有效性。     

Modeling of growth stress gradient effect on the oxidation rate at high temperature

A new oxidation kinetics model is established for high-temperature oxidation. We assume that the interface reaction is fast enough and the oxidation rate is controlled by diffusion process at high temperature. By introducing the growth stress gradient we modify the classical oxidation parabolic law. The modified factor of the oxidation rate constant is a function of growth strain, environment oxygen concentration, and temperature. The modeling results show that the stress gradient effect on the oxidation rate cannot be ignored. Growth strain will dominate whether the stress gradient effect promotes or slows down the oxidation process. The stress gradient effect becomes weaker at higher temperature. This effect is amplified at higher concentrations of environmental oxygen. Applied mechanical loads do not affect the oxidation rate. This model is available for high temperature oxidation of metals and alloys.     

浅谈中国传统工笔人物画风格及技法的演变

中国传统工笔人物画随时代环境及观念的差异而呈现多重的风格,先秦两汉奠定了以线为造型手段的基础。魏晋南北朝时期由简略变为精微,注重“传神”及心理描写,以及意境的追求,技法已趋成熟,风格多样。隋唐五代人物造型板具时代特征,呈现出写实的风格,技法达到了炉火纯青的地步。两宋时期出现了新的风貌,白描淡彩是其独特的风格。元明清由于文人画的兴起受到排斥贬低而趋于衰落。直到20世纪中叶,工笔人物画才得到了复苏、繁荣和发展。     

Determination of soluble solid content and acidity of loquats based on FT-NIR spectroscopy

The near infrared (NIR) spectroscopy technique has been applied in many fields because of its advantages of simple preparation,fast response,and non-destructiveness.We investigated the potential of NIR spectroscopy in diffuse reflectance mode for determining the soluble solid content (SSC) and acidity (pH) of intact loquats.Two cultivars of loquats (Dahongpao and Jiajiaozhong) harvested from two orchards (Tangxi and Chun'an,Zhejiang,China) were used for the measurement of NIR spectra between 800 and 2500 nm.A total of 400 loquats (100 samples of each cultivar from each orchard) were used in this study.Relationships between NIR spectra and SSC and acidity of ioquats were evaluated using partial least square (PLS) method.Spectra preprocessing options included the first and second derivatives,multiple scatter correction (MSC),and the standard normal variate (SNV).Three separate spectral windows identified as full NIR (800-2500 nm),short NIR (800～1100 nm),and long NIR (1100～2500 nm) were studied in factorial combination with the preprocessing options.The models gave relatively good predictions of the SSC of loquats,with root mean square error of prediction (RMSEP) values of 1.21,1.00,0.965,and 1.16 °Brix for Tangxi-Dahongpao,Tangxi-Jiajiaozhong,Chun'an-Dahongpao,and Chun'an-Jiajiaozhong,respectively.The acidity prediction was not satisfactory,with the RMSEP of 0.382,0.194,0.388,and 0.361 for the above four loquats,respectively.The results indicate that NIR diffuse reflectance spectroscopy can be used to predict the SSC and acidity of loquat fruit.     

基于VRML的交互式三维课件的设计与实现

本文针对课件缺乏交互性等问题提出了相应的解决方案,探讨了基于VRML建立交互式三维教学课件的设计与实现。     

双参数月水量平衡模型在汉江流域上游的应用

该文介绍双参数（C和SC）月水量平衡模型的原理,依据水量平衡方程和经验公式构建流域径流深度的模拟方程,利用计算机程序自动率定模型参数。利用1980年1月到1985年12月共6年的水文站点数据对汉江流域上游地区15个水文站点控制的子流域进行了模拟和校验,模型效率指数大都超过80%,其中模拟效果最好的是铁锁关,率定期Nash指数R2达到0.9923,校验期达到0.9377,而大竹河模拟效果最差,率定期Nash指数R2为0.5004,校验期达到0.7382,达到了较好的模拟效果。以典型的两子流域铁锁关和大竹河为例,对模型参数C、SC对模型效率指数的敏感性进行了分析,发现当C变化时,模型效率变化明显,而SC变化时,模型效率指数变化不太明显,但R2极大值附近总能找到相应的C和SC使得RE,REm的值也比较接近0,满足模型的要求,从而验证了模型参数C、SC是能够通过计算机程序自动率定。最后提出结合遥感与地理信息技术改进模型使之能在分布式模型中得到应用的思路。     

基于CityGML的数字城市快速建模研究

研究了基于CityGML的多层次细节3D城市模型快速建模方法,并将其结合到3DUGIS中用于数字城市建设。建模过程中考虑空间关系、拓扑关系和语义信息,建模过程自动化程度高,能够在三维空间直接进行空间分析,方便海量数据的交换与数据挖掘。并给出了上海世博园区三维信息系统结合具体应用案例。     

基于ISM的科技成果转化知识共享障碍及策略研究

科技成果转化的实质是知识流动与成果形态转化耦合的过程,而知识共享是促进科技成果转化中知识流动的核心环节。利用解释结构模型（ISM）对科技成果转化知识共享的障碍因素进行系统分析,并针对关键的根源性障碍要素,给出克服和改进的策略。这对促进科技成果转化的知识管理,提升科技成果转化组织的核心竞争力具有重要现实意义。      

院士本体建模及实例自动存储技术

通过核心扩展及自顶向下的方法构建院士本体,解决如何表达“院士”概念这一问题。文中详细叙述院士本体的构建思路及具体构建过程,并给出院士实例的部分收集模板、实例封装关键策略及其VBA程序代码。     

基于GML3.0的道路网络建模研究

简要介绍了GML3.0及其核心模式,分析了GML应用模式建模的一般过程,并在道路网络建模中得到了具体应用。