The size variation and related implications of mandibles in northern China in the past 7000 years

To better understand variation of Holocene Chinese mandiblular morphology, a study was conducted on 23 metric traits of Neolithic (n=54), Bronze-Iron Ages (n=184) and modern (n=92) adult male mandibles from northern China. Results indicate that the linear characters of these Chinese mandibles evolved in the past 7000 years. From the Neolithic to Bronze-Iron Ages to present day, the overall size of mandibles decreased. The linear characters of the mandiblular features varied between different time periods. The decrease of thickness and height of the mandibular corpus primarily occurred during the Neolithic to Bronze-Iron Ages. The decrease in main size was during the Bronze-Iron Ages to present day. It is possible that mandibles became thinner before the overall size decreased. Comparisons also indicate that the bottom part of the face may have decreased more greatly in breadth than the upper portion. The decrease in mandible size may be associated with changes in climate and diet, and with changes in the craniums size.     

冀东地区诞生礼仪之服饰民俗调查与解读——以唐山市丰润区为例

诞生礼作为中华民族传统人生礼仪的开端,历来为人们所重视。地处红山文化腹地的冀东丰润区老百姓力求保护新生儿生命的巫术行为和仪式是基于民众心意,民俗中对灵魂、灵物、福祉等象征物的信仰与崇拜。通过调查和解读冀东地区诞生礼仪的服饰民俗可以了解其文化内涵。     

浅谈图书馆服务品牌的创建及措施

品牌创建是市场经济的必然要求,各类服务业都在强力推进品牌的建设,图书馆也不能置身事外。从介绍图书馆服务品牌入手,阐述了创建图书馆服务品牌的必要性和措施,不断提高图书馆的服务水平。     

Wavelet Estimation of a Long Memory Parameter In the Stock Market

I 1ntroductlonThe potential presence of stochastic long memory in financial asset returns has been animportant subject of both theoretical and empirical research. If asset returns display longmemory, or long--term dependence, they exhibit significant autocorrelation betweenobservations widely separated in time. In economics and finance, long--range dependencehas a long history and has remained a topic of active research is the study of economic andfinancial time series (see Lo [5j and Mandelb…     

一般似变分包含解的Ishikawa型扰动迭代算法

引入和研究了一类新的包含非凸泛函的一般似变分包含问题．首先使用由Ｄｉｎｇ和Ｌｏｕ提出的η近似映象技巧证明了一般似变分包含问题与一个不动点问题是等价的；其次建立了这一般似变分包含问题解的存在唯一性定理；最后提出和分析了对解该问题的Ｉｓｈｉｋａｗａ型迭代算法，并讨论了这种算法的收敛性．本文结果包含了该领域某些近期结果作为特殊情形     

经理期权的不合适性与非期权长期激励方式探讨

文章分析了经理期权的不合适性 ,探讨了非期权长期激励方式 ,提出用企业盈利能力和企业成长性指标衡量不同时点的企业价值 ,并据此确定对经理人员长期激励性奖励的方法     

Electromagnetic tomography: dyadic Green'' s function method

This study aims at formulating a dyadic Green' s function method for directly solving the forward and inverse problems of the electromagnetic tomography (EMT) with parallel field sensor. First, an integral equation of the electromagnetic problem for the EMT sensor is presented in terms of an equivalent source, which takes the dyadic Green's function G (r, r') as its kernel. Next, starting from a single conducting cylinder filled with homogeneous medium, a convenient way of finding the electric dyadic Green's function of the first kind Gel( r, r) is described based on the method of Ga. Then, an eigenfunction expansion of the Gel( r, r) into vector wave functions M and N is obtained by means of a contour integration. Finally, an expression of the G( r, r' ), the dyadic Green' s function for the EMT sensor with cylindrically layered structure, is deduced from Gel(r, r) by adding reflected wave terms to it.     

张说诗文系年考辨

经考证,唐宰相张说《张说之文集》中部分诗文作品的创作时间等有误,对其辨正很有必要。     

基于加工动力学模型的工艺可靠性仿真方法

大型数控装备具有单件加工周期长、加工成本高等特点,一旦其发生加工故障将会给企业带来巨大经济损失.为此,从数控装备加工过程动力学建模的角度出发研究了工艺可靠性仿真方法.首先建立了数控装备铣削加工过程的非线性动力学模型,以分析不同工艺条件下数控装备铣削加工性能. 在此基础上,采用支持向量回归机,建立了数控装备铣削加工性能映射模型及其工艺可靠性仿真模型. 最后,以数控七轴五联动车铣复合加工机床为对象开展了实例仿真分析.仿真结果表明该方法能够较好地识别数控装备加工过程中不同工艺参数的调整对其工艺可靠性的影响.     

Investigation of octupole effects in superheavy nuclei with improved potential-energy-surface calculations

It has been found that high-order deformation (e.g.β6) can have important effects on the structures of superheavy nuclei. In the present work, we investigate octupole deformation effects on superheavy nuclei with an improved potential-energy-surface (PES) calculation by including reflection-asymmetric deformations in a space of (β2 ,β3 ,β4 , β5). The calculations give various deformations including highly deformed (β2 ≈ 0.4) and superdeformed (β2 ≈ 0.7) shapes. The octupole-deformation degree of freedom mainly affects the fission barrier beyond the second minimum of PES.