具有褶皱表面的磁性多层膜中线性及非线性表面静磁波

In these formulae,γ is the gyromagnetic ratio,and f1and f2 are used as the magnetic andnonmagnetic fractions in the multilayers,respectively.Therefore f1=d1/ ( d1+d2 ) and f2 =d2 / ( d1+d2 ) ,with d1representing the thickness of magnetic layers and d2 the thickness of nonmagneticlayers.In our previous paper[2 3 ] ,we obtained the useful non-zero components of the third-ordermagnetizations with foundation al frequencyω,for a surface magnetostatic wave propagatingalong the x axis,which arwhere…     

Effect of Electromagnetic Fields and Explosions on Seismicity and Geodynamic Consequences

The change in seismicity of the Garm region in Tajikistan after an irradiation of its crust with high energy electromagnetic pulses (EP) and after the Semipalatinsk nuclear explosions (NE) is considered. It’s shown that the influence of EP, as well as NE, causes a statistically significant increase in the seismic activity and speed up the seismic energy release. Two areas of anomalous increase in seismic energy after irradiation and explosions adjoined to active faults were identified within the region. Both have a complex configuration in the form of two “petals” located in different sides of those faults. In both cases, one of the “petals” appears after EP, and the second after NE. It is shown that each of these “butterflies” constitutes as a whole anomalous area in which there are high tectonic stresses. The impact of NE has also been studied before beginning and after completion of these experiments. In both cases, those anomalous areas were not observed. Moreover after those experiments were completed, on distances of 50~70 km from the EP source no high stresses areas were observed at all. Consequently, the irradiation of the crust caused their relaxation on the area of about 3 500 km2. However,judging by the appreciable rise in seismicity caused by NE on the southwestern and southeastern margins, stresses had been increasing on periphery of the irradiated area.     

NEW FORM OF IRREP OF SUPER--SYMMETRY ALGEBRA OSP(1, 2)

In preceding works, the irrep of super-symmetry algebra OSP (1,2) waslabelled by J, its basis vectors were denoted by |JIM>, where J = 0, 1/2,1,3/2,……,I=J, J-1/2, M = -I, -I 1, ……, I. The dimension of the irrep J is 4J 1. We will point out that in order to labell the basis vectors, it is sufficient touse an variable M. We denote the basis vectors as |2J,M>, where M = - 2J, - 2J l, ……, 2J. The dimension of the irrep J still is 4J 1. In order to prove it to be true, the only thing for us is to change the form ofalgebra OSP (1, 2) as     

Partial intestinal obstruction secondary to multiple lipomas within jejunal duplication cyst: A case report

Lipoma within jejunal duplication presenting as abdominal bloating and partial intestinal obstruction is an exceptional clinical entity.We report a case of 68-year-old man complaining of abdominal bloating for 10 d due to multiple lipomas arising from jejunal duplication cysts.Only a few cases of a single lipoma within a Meckel’s diverticulum giving rise to this clinical scenario have been reported in the English language literature.However,no case of multiple lipomas within jejunal duplication cysts has be...     

Realization of Irreducible Dr-Moduleswith Highest Weight tλ_1

Let n=2 r be a positive even integergreater than 2 .Let F be a Field of char F =0 {e1 ,… ,en}withbasis and let V be n-dimensional linear pace over F .Eij is the linear transformation of V whichsatisfies that Eijek=δjke I i,j,k=1,… ,n.Suppose that k isa positive integer and 1≤ k≤ n.Letirreducible Dr-module with highest weight tλ1 ( see[1] ) .If Q={k1 ,k2 ,… ,kt},where k1 ,… ,kt},are positive integers and 1≤ k1 ,… ,kt≤ n ( some of k1 ,　　 Xm( s) ={j1 … js-m -1 si1 …im|j1 … js…     

TGF-β1和bFGF在肺泡间隔 胶原沉积中的作用

The objective is to study the action of transforming growth factor-β₁(TGF-β₁)and basic fibroblast growth factor(bFGF)in the collagen deposition of fibrotic interstitial lung desease(FILD)by using the methods of HE staining and Masson's trichrome staining and the inmmunohistochemical SP method.Collagen was singularly deposited in alveolar septum when FILD developed into the late stage.Abnormal collagen deposition in alveolar septum has four grades.It was demonstrated that the positive\|rates of TGF-β₁ expressed both in pulmonary macrophages and hyperplasia pneumocytes type　Ⅱ of FILD cases were higher than those of diseas control cases,and there was a significant difference between the two groups(P＜0.05).However,only the positive\|rates of TGF-β₁ expressed in hyperplasia pneumocytes type Ⅱ of collagen\|deposited cases were higher than those of no collagen\|deposited cases(P=0.01),both of which were FILD.The positive\|rates o bFGF expressed in pulmonary macrophages of FILD cases were higher than those of disease control cases(P＜0.025).So the conclusion is that bFGF could cooperate with TGF-β₁.The two cell factors could play a part in the process of abnormal collagen deposition in FILD.     

An Average Edge Distance Contribution Method for Identifying Influential Nodes in Complex Networks

How to accurately and effectively identify the influential nodes in networks has always been a core issue. In order to evaluate the importance of the nodes, some famous centrality measures have been proposed and widely used. However, the existing methods still exist some shortcomings. In this work, a novel method named average edge distance contribution (AEDC) is proposed to effectively find the influential nodes, which measures the average contribution of each edge to the sum of distances of all node pairs in the network. For each node, we utilize the relative change of AEDC by removing it from the network to determine its influence. For verifying the effectiveness and feasibility of the AEDC method, we simulate the process of disease spreading in four real complex networks with the Susceptible Infected Recovered (SIR) model. The experimental results show that our proposed method is more accurate than several benchmark centrality measures in terms of identifying the influential nodes.     

An Experimental Study of Mandarin Stress Patterns as a Source of Interference in English Language Learning

<正>1 Mandarin Chinese is a tone language with four lexi-cal tones for meaning distinction.So even for the same syl-lable,when the tone has changed,its meaning changes,e.g.m(?)(mother), m(?)(hemp)m(?)(horse),m(?)(curse).Com-paring with the tones,stress seems to be of less importance.Yet,does stress in Mandarin exert no influence on the Chi-nese students’learning of English?And is there really noapparent phonological translation of Mandarin stress pat-terns in the English language learning?The answer is obvi-ously not.But before we start our experimental studies ofthis issue,it is necessary to have a brief view of the Man-darin word stress potterns.According to the traditional views,it is generally agreedthat Mandarin word stress patterns fall mainly intofour basic types—2 1,1 0,2 3 1,and 2 3 3 1 standing fordisyllabic,trisyllabic,and quadrisyllabic words respectively(the numbers 1,2,3,0 correspond to primary,secondary,tertiary and weak stresses)(cf.Chao(1968),Xu(1980),     

The Schwarzschild Black Hole in New General Relativity

The problem of the Black Hole is discussed by the schwarzschild Solution of Hayashi's New Genral Relativity, we find: when -0.008<ε<0,there is no Sch warzschild Black Hole of New General Relativity; when ε=0, there is the Sch warzschild Black Hole which is identical with the one of General Relativity,when 0<ε<1/4,there is the Scharzschild Black Hole which is similar to the one of General Relativity.     

细叶杜香叶中4种单萜的分离及结构鉴定

采用硅胶柱色谱及HPLC等分离方法对细叶杜香叶正己烷提取物进行分离纯化,得到4种单萜类化合物.依据波谱数据分析,鉴定其结构分别为:2-醛基-5-异丙基二环[3,1,0]-2-己烯(1),[1R,2S,5S]-5-异丙基二环[3,1,0]-2,7-己二醇(2),[1R,2R,5S]-5-异丙基二环[3,1,0]-2,7-己二醇(3),乳香醇C(4).其中,化合物2~4为首次从细叶杜香中分离得到.     

正交试验法在颗粒材料堆自组织分析中的应用

颗粒材料堆具有非均质性、非连续性及随机性等内在的独特性质,从而给研究带来很大困难.颗粒材料堆在承载时,其力学性质与颗粒的大小、排布、堆积高度、表面的粗糙程度以及加载速度都有着密切关系.通过采用室内正交实验,利用自制的设备,研究了堆积高度、粒径和加载速度3个因素在不同水平下对颗粒材料堆自组织现象的影响.     

亚锰酸盐La0.7CaxSr0.3-xMnO3的磁电阻效应

研究了用固相反应法制备亚锰酸盐La0.7CaxSr0.3xMnO3系列多晶样品(量分数x＝0．05，0．10，0．15，0．20，0．25，0．30)，并在零磁场和0．3T磁场下研究了电阻和磁电阻与温度(77—380K)的关系，结果发现随x的增加，样品的巨磁电阻效应的峰值温度向高温移动，磁电阻峰值基本保持不变.     

磁场退火对顶钉扎自旋阀磁电阻性能的影响

采用高真空直流磁控溅射的方法制备了结构为Si/SiO_2/Ta(3.2nm)/Ni_(81)Fe_(19)(18.7nm)/Co_(90)Fe_(10)(3.9nm)/Cu(2.5nm)/Co_(90)Fe_(10)(22.4nm)/Ir_(22)Mn_(78)(23.8nm)/Ta(3.6nm)的顶钉扎型自旋阀,研究了磁场退火的温度和时间对自旋阀的磁电阻变化率(GMR)的影响。结果发现,随磁场退火温度的升高和时间的增加,GMR呈现先升高后降低的趋势,275℃为最佳退火温度,最佳退火时间只有15min,分析了该趋势的变化原因。最佳退火条件下制备的自旋阀GMR达到6.0%,自由层矫顽力(H_c)为11Oe,交换场(H_(ex))约为108Oe。     

巨磁阻效应研究的最近进展

本文综述了近几年来巨磁阻材料的研究进展,并将其粗略的分为五种类型,简要分析了每种类型的物理机制。     

几种各向异性对氧化铁Hc的影响

本文对粉状颗粒和连续薄膜在γ-Fe₂O₃与Fe₃O₄之间的相变中矫顽力H_c的变化进行了讨论.无论在氧化中或还原中,球状颗粒和连续薄膜H_c的增加主要是应力各向异性引起的;而针状颗粒H_c的降低则是受到与颗粒尺寸变化相联系的形状各向异性的影响.     

基于正交试验和层次分析法的散体材料堆实验研究

通过对散体材料堆竖向加载的正交试验,采用极差分析和层次分析法分析不同的堆积高度,粒径大小,及加栽速率下对散体材料堆抵抗竖向荷载破坏能力的影响．研究结果表明：堆积高度对抵抗力影响很大,粒径大小和加栽速率对抵抗力影响较小,抵抗力随堆积高度增大而减小,随粒径大小和加载速率增大而增大．     

层间有反铁磁交换相互作用的磁性超晶格的推迟模式

我们用等效介质理论计算了层间有反铁磁交换的侧向晶格。当外场垂直于磁性或非磁性层时，在这种超晶格中存在两种磁序：反转自旋（flop)和平行自旋磁序。我们发现，这两种磁序的表面模的频率随外场和层间耦合的变化情况很不同。前一种磁序中，模式的频率对层间耦合非常敏感，我们还发现使表面模存在的两个外场临界值。     

水基Fe3O4磁流体的制备及其性能研究

最近几年,许多研究集中在兼具液体流动性和固体磁性的双重性质的磁流体的制备上．磁流体中悬浮在液体中的固体颗粒大约10nm左右．为防止粒子团聚必须将粒子进行很好的分离,这种分离由向液体中滴加表面活性剂来完成．所以表面活性剂对形成稳定的磁流体来说是非常重要的．本文中我们找到了有效形成水基磁流体的两种表面活性剂．用化学共沉淀法制备了Fe3O4纳米粒子,并且用双层表面活性剂对粒子进行包裹．纳米粒子的大小通过XRD及TEM分别进行了表征．本文获得了粒子分散良好的稳定的水基磁流体．主要对磁流体的粘度进行了讨论．结果表明该流体的粘度很小并随外磁场增加而增加,随温度升高而降低．     

纺锤形α—Fe2O3微粒的合成研究

研究了使用NaH_2PO_4作生长助剂,利用Fe(NO_3)_3水溶液强力水解制备纺锤形α-Fe_2O_3微粒的较适宜条件.发现在沸腾回流的动态环境下,可以实现较高Fe(NO_3)_3浓度和较短水解时间内完成纺锤形α-Fe_2O_3粒子的合成.这对实现无极磁粉新的合成方法和均匀胶体粒子制备具有重要意义.     

涡流对反铁磁层间耦合侧向磁性超晶格推迟模的影响

使用等效介质理论研究层间有反铁磁交换相互作用存在的超晶格的推迟模.特别是,考虑传导电流和位移电流对推迟模的影响,给出了层间存在着反铁磁耦合的磁性超晶格的自旋波衰减随波矢k,外磁场H0的变化曲线.