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.     

论民族国家文化建构与话语选择的三个维度

从20世纪50年代末开始,西方文化研究取得了快速的发展,最终在90年代形成了文化研究的高潮。结果,新文化的研究旨趣横扫了欧美大部分学术领域,取代了一度占据学术制高点的新社会学研究方法。从研究中可以看出,民族国家的文化不但是继承的、发展变化的还是针对现实问题而创造的。文化的创造性建构也是当今全球化现实的要求。在这一过程中,要求民族国家文化发展道路的选择上具有三个维度的渐进式发展和升华：社团话语、民族国家话语以及世界话语。     

分析仪器合格性的验证与性能校验

对分析仪器的合格性验证与性能校验的过程、方法进行综述 ,同时对购买仪器提出参考意见。     

油松花粉对雄性幼年小白鼠睾丸发育及精子生成的影响

研究了油松花粉对雄性幼年小白鼠睾丸发育及精子生成的影响．并与睾酮组和正常对照组进行了比较．结果表明：油松花粉具有类似睾酮的作用，可促进睾丸的发育及精子的生成，油松花粉作为营养保健品开发，儿童不宜服用。     

苯胺与聚硫橡胶原位电化学复合的性质

讨论了苯胺与聚硫橡胶电聚合时的相互作用，结果表明，聚苯胺与聚硫橡胶之间具有互相催化作用，且随着复合膜厚度的增加催化活性增高；同时还可提高聚硫橡胶电氧化还原的可逆性     

机电领域中伺服电机的选择原则

提出的选择原则是将电机特性与负载特性分离开，并用图解的形式表示，这种表示方法使得驱动装置的可行性检查和不同系统间的比较更方便，另外，还提供了传动比的一个可能范围。     

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.     

Two-scale finite element Green’s function approximations with applications to electrostatic potential computation

<正> In this paper,a two-scale finite element approach is proposed and analyzed for approximationsof Green's function in three-dimensions.This approach is based on a two-scale finite elementspace defined,respectively,on the whole domain with size H and on some subdomain containing singularpoints with size h (h H).It is shown that this two-scale discretization approach is very efficient.In particular,the two-scale discretization approach is applied to solve Poisson-Boltzmann equationssuccessfully.     

Identification of <Emphasis Type="Italic">Fallopia</Emphasis> species based on the chloroplast <Emphasis Type="Italic">mat</Emphasis>K gene sequences

In order to develop an efficient identification method for Fallopia plants and drugs, molecular analysis of the partial matK gene sequences was performed on 6 Fallopia species. Based on the matK sequences, a phylogenetic tree was constructed, which showed that different populations of inter- and intra-species could be specified and distinguished. The matK gene sequences of the 6 Fallopia species were all found to be of 1 271 bp in length, with some nucleotide variations throughout the entire sequences. The nucleotide difference at position 1 041 could distinguish F. denticulata from others, while specific nucleotide at position 1 154 became identification markers for F. aubertii. Moreover, four specific marker sites for F. multiflora var. ciliinerve at positions 216, 224, 1 060 and 1 179, seven for F. convolvulus at 318, 765, 772, 874, 936, 952 and 1 036, and seven for F. dentate alata at 111, 192, 366, 450, 457, 1 032 and 1 074 were also observed. By detecting the marker nucleotides and analyzing the phylogenetic relationship, the botanical origins of five inspected drugs were determined, suggesting that matK sequences can be used for authenticating Fallopia plants and drugs.