中国数学史研究状况与趋势——基于2001—2010年数学史文献的计量分析

通过对2001—2010年数学史主流期刊文献的统计和分析,呈现出我国数学史研究在主题和内容、研究队伍及其区域分布、基金资助三个方面的情况,以揭示我国数学史研究的趋势和特征。     

关于角加速度公式的论证

本文论证角加速度公式ε_c/ω_a~2=m_Q~d/q_b~2的正确性,及其与转移距(Turm-Slide Vector或Radius of translation)之间的关系。     

延安市产业结构演变的灰色关联分析

产业结构是经济发展的内因，对产业结构的演变研究与分析是区域经济发展中的重要课题．文章采用灰色关联分析，全面分析了延安市产业结构的变化特点、现状和发展趋势，指出了其发展中存在的问题与制约因素，并对今后产业结构调整提出了建议，对于加快延安经济发展具有现实意义，对推动西部地区类似区域发展也具有重要参考价值．     

板坯连铸粘结型漏钢过程模拟及预报

建立了板坯连铸结晶二维导热数学模型，计算了在下沉拉坯状态下结晶器铜版的温度场及铸坯发生拉时结晶器温度场的变化，通过对粘结型漏钢过程的模拟和拉时结晶器温场的分析，提出了对粘结型拉漏进行预报的预测参数。     

一种用于大型磁翻转显示屏的软件

大型电子显示技术是现代市场经济和科学技术发展的需要．作为此项技术的一种一大型磁翻转显示屏已广泛用于交通运输、金融股市、一般市场及商业广告等领域，本文着重介绍大型磁翻转显示屏的结构及工作原理，同时也介绍了各种软件的任务及特点．     

Louck多项式,Hermite多项式和调和振子

首先介绍了指数算子、Louck多项式和Hermite多项式以及它们之间的内在关联.然后指出了Louck多项式、Hermite多项式和调和振子之间的关系.最后用标准梯方法和King方法讨论了单一调和振子的特征方程和特征值.

Abstract：

The exponential operator eA,Louck polynomials and Hermite polynomials as well as their rela tionships are first introduced.Then,the relationships between Louck polynomials,Hermite polynomials and harmonic oscillators are presented.Finally,the eigenfunctions and eigenvalues of a single harmonic oscillator are discussed by using two methods,the standard ladder method and a King's method.     

对山西生态农业发展途径及模式的探讨

本文提出了生态农业是山西农业发展的必由之路、致富之路，是改变山西农业落后面貌的当务之急和长远之策．文章重点探讨了我省生态农业的发展途径和模式，分析了存在问题与设施对策．     

北京市保护区管理状况分析

近年来中国保护区事业发展迅速,但是管理不能跟上发展的步伐,甚至很多人没有意识到保护区管理工作的重要性,导致目前的这种粗放的管理体系和落后的管理效率,无法起到使生态资源得到合理保护的重要作用。保护区管理评价是对保护区管理的考察和信息搜集工作,并且将有关信息整理、分析得出结论,再反馈到保护区管理系统当中的重要参考资料。采用国际通用的保护区管理评价框架,对北京郊区的三个自然保护区(松山、云蒙山、喇叭沟门)进行调查评价。将获得的资料整理,分别从行政管理、经济管理、森林资源管理、内部人员管理、保护工作管理和生态旅游管理六个方面的情况进行分析,得出结论,并在涉及局部经济政策、保护区管理模式改进、管理系统和体制的完善方面提出了七项建议。     

Personalized emotion space for video affective content representation

A personalized emotion space is proposed to bridge the “affective gap” in video affective content understanding. In order to unify the discrete and dimensional emotion model, fuzzy C-mean (FCM) clustering algorithm is adopted to divide the emotion space. Gaussian mixture model (GMM) is used to determine the membership functions of typical affective subspaces. At every step of modeling the space, the inputs rely completely on the affective experiences recorded by the audiences. The advantages of the improved V-A (Velance-Arousal) emotion model are the personalization, the ability to define typical affective state areas in the V-A emotion space, and the convenience to explicitly express the intensity of each affective state. The experimental results validate the model and show it can be used as a personalized emotion space for video affective content representation.     

Facile one-pot sonochemical synthesis of hydrophilic ultrasmall LaF3:Ce,Tb nanoparticles with green luminescence

Rare earth nanoparticles (RENPs) have great superiority as luminescent materials for broad applications, and a prerequisite for most of their application is to obtain hydrophilic RENPs with efficient luminescence and small diameter (o10 nm). To address this problem, we report a facile one-pot sonochemical route with tetraethylene glycol as the solvent and tetrafluoroborate-based ionic liquid as the fluorine source for the synthesis of LaF3:Ce,Tb as the model of RENPs. LaF3:Ce,Tb nanoparticles with the diameter of about 6 nm were prepared in a very short ultrasound time (10 min). Fourier transform infrared spectrum reveals the presence of tetraethylene glycol ligands on their surface, which confers high solubility of LaF3:Ce,Tb nanoparticles in water. Under 254 nm UV excitation, the aqueous dispersion of LaF3:Ce,Tb nanoparticles exhibits strong green emission with luminescent quantum yield of 50%. This work probably contributes to not only the fundamental research of shape-controlled LaF3:Ce,Tb nanoparticles but also new methods of producing other RENPs for broad applications.