Complete Nucleotide Sequence of a Newly Avirulent Newcastle Disease Virus Hubei 92(HB92) Strain

Newcastledisease (ND )isaseriousaviandiseasewithworldwidedistributionthatcancausesevereeconomicloss esinthepoultryindustry .Thecausativeagentofthedisease ,newcastlediseasevirus(NDV)alsoknownasavianParamyxovirustype 1,isamemberoftheParamyxoviridaeandcontainsasin gle strandednegativesenseRNAgenomeencompassing 15 186nucleotides[1 3] .Theviralgenomecontainssixgenes ,whichen codetheviralnucleoprotein(NP) ,phosphoprotein(P) ,matrixprotein(M ) ,fusionprotein (F) ,hemagglutinin neuraminidase(HN…     

Complete Nucleotide Strain Sequence of a Newly Avirulent Newcastle Disease Virus Hubei 92（HB92） Strain

A new avirulent, heat-resistance HB92 strain of newcastle Disease Virus (NDV) was acquired from Australia V4 strain. Its complete nucleotides sequence was first determined. The entire genome of NDV HB92 consists of 15 186 nucleotides (GenBank accession no. AY225110). It was demonstrated by sequence analysis that nucleotides homology of HB92 strain with virulent strain ZJ1 were 83.9%, and the homology compared with avirulent vaccine strain La Sota and B1 were 94. 0% and 93. 5%, respectively. These results might be contributive to the study of the molecular mechanism of evolution of the NDV strain HB92 and to develop the engineered recombinant vaccine.     

分子导体(PyH)[M(dmit)2]2(M=Pd,Ni)的晶体结构与能带结构

在配合物型分子导体(PyH)[Pd(dmit)2]2和(PyH)[Ni(dmit)2]2中,阴离子导电组元[M(dmit)2]^0．5-(M=Pd,Ni)的面对面堆积和肩并肩排列形成二维层状结构．采用推广休克尔紧束缚方法计算了二维导电层中相邻两阴离子的HOMO轨道的重叠积分,并进行了二维能带计算．计算结果表明它们是窄能隙半导体。与晶样的变温电导测试的结果一致.     

Au（111）衬底上单层Pd的电子态密度

用Ｒｅｃｕｒｓｉｏｎ方法计算了几个表面系统的电子态密度，这些系统在费米能附近的态密度主要是由原子的ｄ轨道贡献的．Ｐｄ（１１１）的态密度峰基本上就在费米能附近，而Ａｕ（１１１）－Ｐｄ的态密度峰在费米能级以下约０．９ｅＶ附近，这种差别被归因于原子间距的增大和顶层与衬底间原子ｄ轨道能的较大差异．     

~（92）M_o（n，p）~（92m）Nb，~（98）M_o（n，p）~（98m）Nb和~（94）M_o（n，2n）~（93m）M_o反应截面测量

报告了Ｅｎ＝１３．４０～１４．７９ＭｅＶ中子能区用活化法以２７Ａｌ（ｎ，α）２４Ｎａ截面为中子注量标准测得的９２Ｍｏ（ｎ，ｐ）９２ｍＮｂ．９８Ｍｏ（ｎ，ｐ）９８ｍＮｂ和９４Ｍｏ（ｎ，２ｎ）９３ｍＭｏ的反应截面．还列举了尽可能收集到的数据，并将９２Ｍｏ（ｎ，ｐ）９２ｍＮｂ和９８Ｍｏ（ｎ，ｐ）９８ｍＮｂ两反应过的实验测量值与理论计算值进行了比较．中子能量是用铌锆截面比法测定的．     

O_2在Pd_2@Au/Pd(100)表面上分解机理研究

采用密度泛函理论,在slab模型下,研究了O2分子在Pd2@Au/Pd(100)表面上的吸附与分解.结果表明:O2分子优先吸附于Pd-Pd桥位,O-O键轴平行于表面.O2分子通过其3σg和1πu轨道向表面转移电荷,又通过其1πg轨道接受来自表面的电子,净的结果是每个O原子得到了0.22e.合金表面暴露出来的Pd二聚体团簇为催化分解O2的活性中心.O2分子在Pd2@Au/Pd(100)表面上分解时,首先需要在扩散中断裂O-O键,然后经过一系列O原子的扩散过程,达到稳定的产物结构.     

二异丙基二硫代氨基甲酸与二氯化钯的配合物的合成、结构和表征

通过X—射线晶体衍射,确定了化合物[Pd(iPr_2dtc)_2]的晶体和分子结构。晶体属单斜晶系,空间群为:P2(1)/C,晶胞参数分别为:a=0.81664(1),b=1.81265(2),c=1.48699(2)nm,α=90,β=101.667(1),γ=90°,Z=2。钯(Ⅱ)正离子作为中心对称离子呈现平面正方形的几何构型,二异丙基二硫代氨基甲酸根阴离子作为二齿配体通过二个S原子与钯(Ⅱ)原子配位。分子间形成的C—H…S氢键使配合物趋于稳定。     

Effect of the formation process of transient liquid phase (TLP) on the interface structure of TiAl joints

TiAl has been joined employing the transient liquid phase (TLP) bonding with Ti combined with Cu, Ni or Fe foils. Experimental results showed that though the interface structures of the joints are quite different, all the joined zones are composed of five sublayers, i.e. two diffusion zones, two interfacial zones and an interlayer. It has been convinced that the formation process of the transient liquid phase controls the diffusion behavior of melting point depressant (MPD) Cu, Ni, and Fe atoms, which leads to form different interface structures of the joints.     

Ag替代Pd的含Ce化合物的制备及表征

在反铁磁性近藤化合物CePdAl3的Pd位置，用Ag进行替代，制备了Ce(Pd1-xAgx)2Al3化合物，并用X线衍射方法对样品进行表征，计算得到了样品的晶格常数和晶胞体积。     

Evidence for Asian summer monsoon precipitation instability of the Younger Dryas phase

The loess and desert transitional zone of China responses sensitively to the Asian monsoon fluctuations. A high resolution loess-dust and aeolian sand-paleosols section records the climatic history of the Younger Dryas. Based upon AMS¹⁴C dating of pollen concentrates and proxy climate indices including magnetic susceptibilty, organic carbon content and grain size, it is demonstrated that the Asian monsoon climate manifests not only cooling as in other regions of the Northern Hemisphere, but also unusual oscillations in precipitation which were probably associated with atmospheric interactions between both the Northern and Southern Hemispheres and atmospheric pressure anomalies of topic Pacific Ocean (ENSO).     

Three-dimensional observation of the phase structure of high density polyethylene （HDPE）/poly（ethyleneco-butene） （PEB） blend by laser scanning confocal microscopy

In this paper,high density polyethylene (HDPE)/poly(ethylene-co-butene) (PEB) blend (50/50 wt%) was prepared through solution blending and then compression molding,and subsequently examined by laser scanning confocal microscopy (LSCM). The PEB used in this experiment was labeled with a small quantity of a fluorescein derivative to render fluorescence. The initial films showed uniform dye dis-tribution and no indication of phase separation within the resolution of optical microscopy. Sample films annealing at 140℃ followed by rapid cooling to room temperature showed obvious phase sepa-ration and bicontinuous structure. The present work indicates that by labeling one component with fluorescein derivative,LSCM can efficiently perform in situ depth profiling of polymer blends.     

求解一类（0,1,2）规划问题的二级定界组合算法

提出了一种求解一类（０，１，２）规划问题的二级定界组合算法，该算法采用二级高位优先的先成算法，按目标函数的一定排列顺序有规划地生成所有组合，采用二级定界组合算法，有效地删除大多数非可行组合和非最优组合，大大减少了搜索组合的个数，具有较高的计算效率。     

二咪唑基甲烷配体构筑 Ag( I)配位聚合物的合成与晶体结构

通过溶液扩散合成了一个新颖的基于二咪唑基甲烷配体( BIM)构筑的Ag(I)配位聚合物[Ag (BIM) ClO4] n ,对其进行了元素分析,红外光谱与热重分析表征,并用单晶X射线衍射测定了晶体结构.该配合物属于单斜晶系,空间群为P2(1)/c,晶胞参数为a=4.8952(4)樻,b=14.1094(13)樻, c=15.5731(14)樻,α=90°,β=90.458(2)°,γ=90°, V=1075.57(16)樻3, Z=4, Dc =2.195 mg/m 3,μ=2.132 mm-1, F(000)=696,最终R=0.0302,wR=0.0762用于1814个可观测点.晶体结构表明Ag(I)离子同二咪唑基甲烷配体以直线型二齿方式配位形成一维“之”字链的阳离子结构,并通过金属-π键作用和阴离子的桥联作用形成三维的金属有机网格,该化合物十分稳定,热力学分解温度为352℃.