卧式椭圆轨迹振动筛的自定中心问题研究

当振动筛筛箱各点作长轴平行于筛面的椭圆轨迹运动时,这种振动筛的胶带轮不可能只作定轴转动(即自定中心)。如果恰当地选择胶带轮几何中心的偏心值,胶带轮的摆动幅度将减小,因此,胶带的工作情况仍将得到改善。     

论当前影视霸权与文学尴尬生存的悖论性处境——以铁凝作品的影视改编为例

90年代以来消费主义文化的蓬勃兴起和媒介权力的空前膨胀,传统意义上的当代文学格局已经发生了深刻的变迁,而影视文化的强势崛起是造成文学影响力削弱的重要因素。本论文通过对铁凝作品的影视改编过程的解读和阐释,具体的剖析影视与文学之间从共荣、疏离、蚕食、反抗的深切关联,直接关涉到我们对影视时代文学尴尬的生存方式的感知和变迁时代的文化症候。     

试论英语词汇语义上的动态发展

任何一种语言都是活的语言,它随着人类社会文明的不断发展和变化在人们实际生活中变化着.英语词语亦如此.本文试图通过透视"英语词汇语义上的动态发展",引起我们对词义变化的足够重视,从而更好地掌握和使用英语词汇.     

重刚体在光滑平面上的定态运动

研究了三轴重椭球体在光滑水平面上的定态运动。确定椭球体的永恒转动、它们的存在条件及稳定性。     

论扬州在吴烺人生中的重要地位

全椒吴氏家族与扬州关系密切,扬州的人文环境和吴家先辈的扬州经历使得吴氏子弟尤其钟情扬州.扬州给予吴烺诸多营养,扬州生活成就了吴烺文学、学术以及思想等方面的造诣；祖辈兴家的自豪与家业衰颓的悲伤,吴烺于此皆能找到寄托.吴烺与一大批学者的扬州交游唱和等也促进了扬州文化的发展与繁荣；另一方面,吴烺扬州经历及文学创作也反映了那个时代知识分子所历经的种种苦难与不幸,说明了封建家族与封建时代文人悲剧命运的必然性.     

Parameter identification for the discretely observed geometric fractional Brownian motion

This paper deals with the problem of estimating all the unknown parameters of geometric fractional Brownian processes from discrete observations. The estimation procedure is built upon the marriage of the quadratic variation and the maximum likelihood approach. The asymptotic properties of the estimators are provided. Moveover, we compare our derived method with the approach proposed by Misiran et al. [Fractional Black-Scholes models: complete MLE with application to fractional option pricing. In International conference on optimization and control; Guiyang, China; 2010. p. 573–586.], namely the complete maximum likelihood estimation. Simulation studies confirm theoretical findings and illustrate that our methodology is efficient and reliable. To show how to apply our approach in realistic contexts, an empirical study of Chinese financial market is also presented.     

Estimation of parameters of SDE driven by fractional Brownian motion with polynomial drift

ABSTRACT

Strongly consistent and asymptotically normal estimators of the Hurst index and volatility parameters of solutions of stochastic differential equations with polynomial drift are proposed. The estimators are based on discrete observations of the underlying processes.     

杨度的四副面孔 ——论唐浩明笔下的杨度形象

在长篇历史小说《杨度》中,唐浩明塑造的主人公杨度共呈现出四副面孔：书生杨度,政客杨度,禅师杨度,以及三幅面孔的纠结所造就的悲剧杨度;杨度形象的饱满和立体体现了唐浩明作为一个学者的思想深度和作为一个作家的艺术高度。     

“婚变”的背后——浅析《墙头马上》中的悲剧因素

一直以来人们都认为《墙头马上》为一部爱情喜剧,通过对此剧中的悲剧性因素悲剧性行动和悲剧性环境的分析,认为此剧并不是仅仅停留在爱情喜剧的层面,而是一部具有社会性婚姻问题的戏剧.     

Conditional moving linear regression: Modeling the recruitment process for ALLHAT

Effective recruitment is a prerequisite for successful execution of a clinical trial. ALLHAT, a large hypertension treatment trial (N = 42,418), provided an opportunity to evaluate adaptive modeling of recruitment processes using conditional moving linear regression. Our statistical modeling of recruitment, comparing Brownian and fractional Brownian motion, indicates that fractional Brownian motion combined with moving linear regression is better than classic Brownian motion in terms of higher conditional probability of achieving a global recruitment goal in 4-week ahead projections. Further research is needed to evaluate how recruitment modeling can assist clinical trialists in planning and executing clinical trials.