Applied Mechanics and Materials Vols. 275-277

Abstract: This article aims at the geology situation of Hai-la-er area, researches the influence factors of the quality of well cementation in the Hai-la-er area., establishes, improves and perfects the improvement measures of enhancing the quality of well cementation in the Hai-la-er area, and also produces notable effects in the filed test. In 2004, there were 11 well cementations in all and 5 of them were of high grade. The average sealing section was 1537 meters, and the factor of merit was 45.45%.

Abstract: There is not a unified division scheme on the lithostratigraphic unit of Zhangjiakou formation from later Jurassic at jibei for a long time, so it makes the divisions more confusion, the establishment of the reasonable stratigraphic sequence and regional stratigraphic correlation has been effected. The Zhangjiakou formation is divided into three lithologic members in turn based on lithology combination of the phase sequence at Zhangjiakou by author through the project of “the study of jibei Mesozoic continental volcanic-sedimentary basin 1:250000 mapping method”. The first section mainly includes lithology combination of weak eruption phase sequence. The second section is main the lithology combination of explosive phase sequence; the third section mainly includes lithology combination of the eruption phase sequence. These three sections respectively represent the stage of the initial outbreak, the large-scale outbreak and a caldera collapse deposition. This division method can reflect volcanic tectonic features, establishing reasonable stratigraphic sequence, this contribute to the study of the history of the volcanic evolution. It can also combine the lithostratigraphic units division and volcanic-sedimentary organically.

Abstract: For an inverse potential scattering problem of stationary Schrödinger equation, we employ a direct sampling method to reconstruct the support of the potential. Compared with the general sampling method, the method we adopt is applicable even when the measured data (near-field data) are only available for one or several incident directions, and has the advantages of simple computation and insensitivity to noises. By the mathematical derivations, we conclude theoretically that for both two dimensional and three dimensional cases, this direct sampling method is feasible and efficient.

Abstract: 1-3-2 piezoelectric composite has been widely used in the field of underwater acoustic transducer. In this paper, Series-parallel model is used to make the theoretical derivation of the resonant frequency of 1-3-2 piezoelectric composite. By using numerical calculation the law of the frequency varying with the cutting depth is gained. It provides theoretical basis for the design of the 1-3-2 piezoelectric composite with multi-mode.

Abstract: Abstract: In order to study the effect of WC size on the thermal expansion coefficient of WC/Cu composites after anneal, WC/Cu composites with different WC particle size were prepared by powder metallurgy method. In this paper the thermal expansion coefficient of WC/Cu composites were measured by digital image correlation method. The results show that the thermal expansion coefficient increased with the increasing of temperature and the particle size.

Abstract: In this paper we apply semi-geodesic trajectories to the creation of isotensoid domes for filament wound pressure vessels. The governing equations for the determination of the meridian shapes and related winding angle distributions of domes are derived using the netting analysis and the semi-geodesic winding law. The effects of the slippage coefficient on the geometry and fiber trajectories of the domes are respectively evaluated in terms of the resulting meridional curves and fiber angles. It is revealed that the semi-geodesic angles and the dome depth have an overall decrease with increasing the slippage coefficient. The results also demonstrate that the use of semi-geodesics significantly enlarge the design space for the geometry and adapted fiber trajectories of the domes. The present method can provide a significant reference for the design and production of the domes for semi-geodesically overwound pressure vessels.

Abstract: In this paper, a representative volume element (RVE) model of composites with different fiber volume fraction is established by ANSYS finite element software. The stiffness matrix of the RVE model can be calculated by studying its stress field, and then the elastic properties of composites could be obtained. By comparing with the results from NASA empirical equation, the reliability of the method can be proved. This is a new way to predict the elastic properties of composites.

Abstract: TiC intermediate layers were formed on the surface of diamond particle with reaction of Ti powders in mixed molten NaCl-KCl salts. The copper/diamond composites with TiC-coated diamond particles were fabricated by pressure infiltration. Then the microstructure and thermal conductivity of the obtained copper/diamond composites were studied. The results showed the thermal conductivity of the composites with a density of 5.65 g/cm³ reached 514 Wm^-1 K^-1, which is much higher than with uncoated diamond. The TiC layers synthesized on diamond particles is shown to be an effective way to enhance the thermal conductivity of copper/diamond composite.

Abstract: According to Hill’s thermodynamics theory for small system, the effect of small system on the type I antifreeze protein ‘HPLC-6’ is discussed in this article. We conclude that when the solution is very dilute, the effect is not visible, and as the concentration increases, the effect becomes more visible than before, and the result also shows that the number of molecules on the ice surface becomes larger when the effect of small system is considered.

Abstract: The author chose three kinds of commercial resins for blank experiment and then added oxidants.We studied that how removal rate changed under different temperature and picked the D001-cc as the best supporter in desulfurization procedure. And heteropolyacid was supported onto D001-cc with different loadings,the results showed 10% was the optimal condition.