MECHANLCAL FAILURE IN HAVERSIAN SYSTEMS ON THE BASIS OF MICROSTRUCTURE

The aim of this paper is to observe variations in the mechanical properties of Haversian systems including Haversian lamellae and canals,by means of the compressive test of five bone specimens subjected to different loads corresponding to 2KN,3KN,dKN,5KN and 6KN respectively. From a series of related microscopic pictures it is clearly seen that:(1) in the lower level of loading (2KN) ,the Haversian canals much the same as the one unsubjected to loads,and conditions of Harversian lamellae are also the same,but,the individual Harversian canal was slightly bent; (2) in the case of the higher levels of loading,it is first deformed in the weaked portion of the Haversian lamellae; (3) with increasing loads,the fracture shapes of the Haversian system are very complex,but the fractures always take place in the cement line between osteons.At the same time,deformed dimensions of the Harversian lamellae and canals were measured. The observed phenomena were qualitatively interpreted by the theory of the linear viscoelas-ticity.     

Nielsen's and Euler's operators of higher order in analytical mechanics

In this paper, the definitions of Nielsen’s and Euler’s operators of higher order are presented. These operators are concerned in analysis for systems with holonomic constraints and non-holonomic constraints of higher order. Some theorems that indicating relation between the two operators are established. Moreover, using the theorems, the new equations of mechanical systems with constraints of higher order are derived. Finally, an example is given.     

红外光谱法研究不同硅铝比的ZSM-5及ZSM-11分子筛的骨架振动

红外光谱法研究分子筛的骨架振动得出了在X、Y等沸石分子筛骨架上振动频率与四面体中铝含量的线性关系^[1]。但未见到有关ZSM-5型的报道.本文用红外光谱法系壳探讨了硅铝比和ZSM-5及ZSM-11的骨架振动频率之间的线性关系,并将由IR得到的SiO₂/Al₂O₃比与化学分析值进行了比较。     

对浙江省田径运动员竞赛心理因素的调查分析

本文采用问卷法、访谈法、逐步回归法,对影响浙江省田径运动员最佳竞技状态的心理因素进行了研究。确定了影响最佳竞技状态的主要心理因素,并发现影响最佳竞技状态的心理因素存在性别差异。     

The variational principles of coupled systems in photoelasticity

ＴＨＥＶＡＲＩＡＴＩＯＮＡＬＰＲＩＮＣＩＰＬＥＳＯＦＣＯＵＰＬＥＤＳＹＳＴＥＭＳＩＮＰＨＯＴＯＥＬＡＳＴＩＣＩＴＹＦｕＢａｏ－ｌｉａｎ（付宝连）（ＹａｎｓｈａｎＵｎｉｖｅｒｓｉｔｙ,Ｑｉｎｈｕａｎｇｄａｏ）（ＲｅｃｅｉｖｅｄＮｏｖ．８,１９８９,Ｃｏ...     

双配体配位的Ni(Ⅱ)、Cu(Ⅱ)金属配合物的结构和性能

本文采用水热合成法制备了两个含有咪唑类配体的配位聚合物:{Ni(nip)(p-bix)(H₂O)₂}_n (1)和{Cu(bbi)(dgc)}_n (2) (nip=5-硝基间苯二甲酸;p-bix=1,4-双(咪唑基-1-甲基)苯;bbi=1,1’-(1,4-丁二基)二咪唑;dgc=3,3-二甲基戊二酸)。通过 X 射线单晶衍射、元素分析、PXRD和TGA对配合物进行表征。结果表明,配合物1为具有规则有序孔道结构的一维双链结构,其孔道结构中的—NO₂赋予金属有机框架(MOF)潜在的应用价值。此外,在分子间氢键的作用下,一维链拓展成三维超分子网络结构。而配合物2则是四连接的{6⁵·8}三维拓扑结构,两个配体通过螺旋式盘绕出规则的孔道架构,丰富的分子间氢键使其骨架结构更加稳固。在2~300 K,外加磁场1 000 Oe的条件下,对这两个配合物进行磁学性质研究,在测定的温度范围内对测试的变温磁化率数据进行居里-外斯线性拟合,拟合得到配合物1和2的居里外斯温度分别为1.73 K和6.78 K,证明两种配合物之间均存在弱的铁磁相互作用。     

基于学科理解的电功视角下“化学反应与能量”教学

基于教师对电化学反应与能量的学科理解，抽提和凝练本原性问题：系统与环境之间的能量传递形式只有“热”吗?电化学反应如何实现电功传递?通过“电功”视角下认识化学反应与能量的主题大概念教学设计与实施，帮助学生建构和完善“电功”认知模型，应用模型进行探究和迁移，形成电化学主题特质性思维方式和方法，充分落实化学学科核心素养。     

Raman spectroscopy in the diagnosis of the wall painting History of Concepción,Chile

Pigments and fresco‐related materials from the wall painting Historia de Concepción by Gregorio De La Fuente in Concepción, Chile were identified by Raman microscopy. The pigments were compared with those obtained from the artist's studio, and results allowed inference about subsequent interventions. Materials coming from processes such as salt efflorescence were also studied. The results contribute to the diagnosis of the current conservation state of the wall painting for its future restoration. Copyright © 2011 John Wiley & Sons, Ltd.     

Models of Adjacent Re‐Entry Folds in the β Form of Syndiotactic Polystyrene. Conformational and Packing Analysis by Molecular Mechanics

The adjacent re‐entry folds of chains of syndiotactic polystyrene crystallized in the β form have been investigated by molecular mechanics. Various models of fold of chains along bilayers have been found. The results are in agreement with the literature experimental data indicating that the fold surface is irregular. Both the conformational and the packing energy of folded chains have been minimized by various techniques using several set of potential functions. A theoretical prediction of the work of fold is given.