The vibrational spectra and structure of sodium bromoacetate and sodium bromoacetate-d2

The complete vibrational spectra of crystalline sodium bromoacetate and sodium bromoacetate-d₂ have been recorded and a vibrational assignmem proposed. The intermolecular coupling of these compounds is quite strong and the data are consistent with a centrosymmetric unit cell containing at least four molecules.The product rule calculations support a structure m which the bromine atom is rotated out of the plane of the remaining heavy atoms, but the frequency of the carbon-bromine stretching mode indicates that the degree of rotation is not large.     

Determination of thiosulphate in the presence of dithionite and sulphite

To determine thiosulphate in the presence of dithionite and sulphite, iodine dissolved in potassium bromide solution is used to oxidize thiosulphate to tetrathionate, and dithionite and sulphite to sulphate. The tetrathionate generated from the thiosulphate is then oxidized with potassium bromate-potassium bromide solution in the presence of hydrochloric acid. The bromine consumption of the tetrathionate is measured by titration of the excess of bromine with sodium thiosulphate after the addition of potassium iodide. For each equivalent of iodine used to determine thiosulphate by the Wollak method, fourteen equivalents of bromine are used to determine thiosulphate by this method.     

Magmatism and deformation times of the Xidatan rock series, East Kunlun Mountains

The Xidatan rock series consist of mylonite, gneiss and granite. The U-Pb age showsthat the granite was formed at 206 Ma, and the ~(40)Ar/~(39)Ar ages of the biotite display that the my-lonite was formed at 145 Ma when the Xidatan ductile shear zone occurred. At about 110-100 Mathe Xidatan Fault reactivated again. As a result, the biotite and muscovite of Xidatan rock seriesopened their argon isotope system.     

Effect of silver doping on the current–voltage characteristic of PbS nanorods

We report on field emission property from a single nanorod measured by using scanning tunnelling spectroscopy. It has been shown that field emission from nanorods of small band gap semiconductor is significantly increasing by doping. The current transport mechanism is explained using double barrier tunnel junction formalism. It is observed experimentally that the Fowler–Nordheim tunnelling mechanism is dominant and governs the transport mechanism. The transport properties of PbS nanostructures in the form of nanorod are investigated in terms of various conduction mechanism. The minimum voltage necessary for triggering Fowler–Nordheim tunnelling under the revised biased for intrinsic sample ~0.95 V and decreases to ~0.67 V for increase doping concentration up to 1.76 wt%.     

异肽键稳定的MERS-CoV融合蛋白S2亚基N端重复序列三股琢螺旋的构建

通过在天然N肽的氨基端引入可以诱导螺旋三聚体形成的人工多肽序列,并通过酰基转移反应在上述嵌合肽所形成的三股α螺旋间引入异肽键,构建了中东呼吸综合征病毒( MERS-CoV)的N-trimer模型,为MERS-CoV融合抑制剂的设计奠定了基础。     

浙东晚中生代岩浆混合作用新证据：新昌儒岙岩石包体群的发现与地质意义

在浙江东部新昌儒岙花岗岩体中,新发现大量闪长岩石英闪长岩包体．它们成群出现,大小不一,大部分呈圆或次圆形,具微细粒结构和冷凝边构造,并发育针状磷灰石．包体的分布,形态和结构构造特点表明,它们属淬冷包体．在化学上,岩石包体与寄主花岗岩及共生的辉绿岩都属亚碱性系列．微量元素协变关系证实,它们由玄武质岩浆和花岗质岩浆不均匀混合形成．新昌儒岙岩石包体群的发现和研究,为研究浙东地区晚中生代的岩浆混合作用、壳幔作用及花岗岩的成因提供了一个新的例证。     

Node-searching problem on block graphs

The node-searching problem, introduced by Kirousis and Papadimitriou, is equivalent to several important problems, such as the interval thickness problem, the path-width problem, the vertex separation problem, and so on. In this paper, we generalize the avenue concept, originally proposed for trees, to block graphs whereby we design an efficient algorithm for computing both the search numbers and optimal search strategies for block graphs. It answers the question proposed by Peng et al. of whether the node-searching problem on block graphs can be solved in polynomial time.     

Oscillation for a nonlinear dynamic system on time scales

We study the oscillation properties of a system of two first-order nonlinear equations on time scales. This form includes the classical Emden–Fowler differential and difference equations and many of its extensions. We generalize some well-known results of Atkinson, Belohorec, Waltman, Hooker, Patula and others and also describe the relation to solutions of a delay-dynamic system.