Xem 1-5 trên 5 kết quả Bulk metallic
  • The aim of the study was to investigate the crystallization kinetics and solidification behaviour of Fe60Co8Mo5Zr10W2B15 bulk glass forming alloy. The solidification behaviour in near-equilibrium and non-equilibrium cooling conditions was studied. The eutectic and peritectic reactions were found to exist in the solidification sequence of the alloy. The bulk metallic glass formation was achieved by using two methods: quenching from the liquid state and quenching from the semi-state.

    pdf140p dontetvui 21-01-2013 42 9   Download

  • Single crystal X-ray crystallography is the most common and easily accessible way to determine the molecular structure of any crystalline material. This method provides two kinds of information which are needed for understanding both single molecule properties and bulk material properties: 1. Molecular Structure - Single Molecules: Unambiguous and three-dimensional information about the structure of the molecular entities.

    pdf450p cucdai_1 14-10-2012 35 6   Download

  • Almost all businesses start small. The U.S. Census Bureau’s Statistics of U.S. Businesses (SUSB) shows that over the last 20 years, about 95 percent of new employer firms started with fewer than 20 employees. Along with start-ups come closures. Firms with fewer than 20 employees also account for 95 percent of closures. This illustrates that business turnover is the domain of small businesses. Establishment turnover follows similar patterns.

    pdf29p nhacchovina 25-02-2013 15 2   Download

  • Nanowires can be defined as structures with thicknesses or diameters of tens of nanometers or less and unconstrained lengths. Many different types of nanowires exist, including metallic (e.g., Ni, Pt, Au or different alloys based on metals), semiconducting (e.g., Si, InP, GaN, etc.), insulating (e.g., SiO2, TiO2), and molecular nanowires (e.g. organic DNA or inorganic). Nanowires have many interesting properties that are not seen in bulk or 3-D materials.

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  • In this paper, materials of ZnS:Cu, ZnS:Mn and ZnO:Co were prepared by ceramic method and co-precipitated method. The presence of transition metals such as Cu2+(3d9), Mn2+(3d5) in ZnS and Co2+(3d7) in ZnO make blue bands at around 476 nm, 486 nm and green band at around 514 nm disappeared. Simultaneously, there are luminescence bands at around 533 nm, 582 nm, 693 nm for bulk samples of ZnS:Cu, ZnS:Mn, ZnO:Co and 603 nm for nanocrystalline sample of ZnS:Mn.

    pdf7p tuanlocmuido 19-12-2012 30 3   Download

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