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David C Johnson - One of the best experts on this subject based on the ideXlab platform.

  • synthesis of snse 1 15 m tase2 n ferecrystals structurally tunable Metallic Compounds
    ChemInform, 2013
    Co-Authors: Ryan Atkins, Jason Wilson, Paul Zschack, Corinna Grosse, W Neumann, David C Johnson
    Abstract:

    The title ferecrystals (fere: Latin, almost) with 1 ≤ n,m ≤ 6 and n and m varied independently are prepared by physical vapor deposition of the elements followed by annealing at 400 °C for 30 min.

  • synthesis of snse 1 15 m tase2 n ferecrystals structurally tunable Metallic Compounds
    Chemistry of Materials, 2012
    Co-Authors: Ryan Atkins, Jason Wilson, Paul Zschack, Corinna Grosse, W Neumann, David C Johnson
    Abstract:

    A modification of the modulated elemental reactants synthetic technique was developed and used to synthesize eleven members of the [(SnSe)1.15]m(TaSe2)n family of Compounds, with m and n equal to integer values between 1 and 6. Each of the intergrowth Compounds contained highly oriented intergrowths of SnSe bilayers and TaSe2 monolayers with abrupt interfaces perpendicular to the c-axis. The c-lattice parameter increased 0.579(1) nm per SnSe bilayer and 0.649(1) nm per Se–Ta–Se trilayer (TaSe2) as m and n were varied. ab-plane X-ray diffraction patterns and transmission electron microscope images revealed a square in-plane structure of the SnSe constituent, a hexagonal in-plane structure for the TaSe2 constituent, and rotational disorder between the constituent layers. Temperature dependent electrical resistivity, measured on several specimens, revealed Metallic behavior, and a simple model is presented to explain the differences in resistivity as a function of m and n.

Hiroyasu Tanigawa - One of the best experts on this subject based on the ideXlab platform.

  • interface microstructure evolution of dissimilar friction stir butt welded f82h steel and sus304
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2011
    Co-Authors: Young Dong Chung, Hidetoshi Fujii, Yufeng Sun, Hiroyasu Tanigawa
    Abstract:

    Abstract The dissimilar butt welded joint of reduced-activation ferritic/martensitic steel (RAF/M) F82H and austenite stainless steel (AISI304 (SUS304)) were studied by friction stir welding. The effect of the position of the steels and tool plunging was considered in order to prohibit the mixing of the F82H and SUS304. When the dissimilar butt welding was performed such that the F82H plate was on the advancing side and the tool was plunged on the F82H side, defect-free joints could be successfully fabricated. Optical microscopy and EDX analysis were used to characterize the dissimilar joint microstructures and the interface. It was confirmed that the dissimilar joint formed no mixed structure and inter-Metallic Compounds.

Guangming Zeng - One of the best experts on this subject based on the ideXlab platform.

  • influence of sewage sludge based activated carbon and temperature on the liquefaction of sewage sludge yield and composition of bio oil immobilization and risk assessment of heavy metals
    Bioresource Technology, 2014
    Co-Authors: Yunbo Zhai, Hongmei Chen, Bobin Xiang, Zhong Chen, Guangming Zeng
    Abstract:

    Abstract The influence of sewage sludge-based activated carbons (SSAC) on sewage sludge liquefaction has been carried out at 350 and 400 °C. SSAC increased the yield and energy density of bio-oil at 350 °C. The Metallic Compounds were the catalytic factor of SSAC obtained at 550 °C (SSAC-550), while carbon was the catalytic factor of SSAC obtained at 650 °C. Liquefaction with SSAC redistributed the species of heavy metals in solid residue (SR). With the addition of SSAC, the risk of Cu, Zn and Pb decreased at 350 °C, while at 400 °C the risk of Cd, Cu, and Zn were decreased. Ecological risk index indicated that 400 °C was preferable for the toxicity decrement of SR, while risk assessment code indicated that SR obtained at 350 °C contained lower risk. Considering the bio-oil yield, liquefaction at 350 °C with SSAC-550 was preferable.

Jan Hermann - One of the best experts on this subject based on the ideXlab platform.

  • density functional model for van der waals interactions unifying many body atomic approaches with nonlocal functionals
    Physical Review Letters, 2020
    Co-Authors: Jan Hermann, Alexandre Tkatchenko
    Abstract:

    Noncovalent van der Waals (vdW) interactions are responsible for a wide range of phenomena in matter. Popular density-functional methods that treat vdW interactions use disparate physical models for these intricate forces, and as a result the applicability of these methods is often restricted to a subset of relevant molecules and materials. Aiming towards a general-purpose density functional model of vdW interactions, here we unify two complementary approaches: nonlocal vdW functionals for polarization and interatomic methods for many-body interactions. The developed nonlocal many-body dispersion method (MBD-NL) increases the accuracy and efficiency of existing vdW functionals and is shown to be broadly applicable to molecules, soft and hard materials including ionic and Metallic Compounds, as well as interfaces between organic molecules and inorganic materials.

  • density functional model for van der waals interactions unifying many body atomic approaches with nonlocal functionals
    arXiv: Materials Science, 2019
    Co-Authors: Jan Hermann, Alexandre Tkatchenko
    Abstract:

    Noncovalent van der Waals (vdW) interactions are responsible for a wide range of phenomena in matter. Popular density-functional methods that treat vdW interactions use disparate physical models for these intricate forces, and as a result the applicability of these methods is often restricted to a subset of relevant molecules and materials. Aiming towards a general-purpose density functional model of vdW interactions, here we unify two complementary approaches: nonlocal vdW functionals for polarization and interatomic methods for many-body interactions. The developed nonlocal many-body dispersion method (MBD-NL) increases the accuracy and efficiency of existing vdW functionals and is shown to be broadly applicable to molecules, soft and hard materials including ionic and Metallic Compounds, as well as organic/inorganic interfaces.

Hongliang Yang - One of the best experts on this subject based on the ideXlab platform.

  • effect of pre hole offset on the property of the joint during laser assisted friction stir welding of dissimilar metals steel and aluminum alloys
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2016
    Co-Authors: Xinjiang Fei, Xiangzhong Jin, Tengfei Xiu, Hongliang Yang
    Abstract:

    Abstract In this paper, the influence of pre-hole offset distance on the properties of the welding joint during laser-assisted friction stir welding of Q235 steel and 6061-T6 aluminum alloy was studied. The tensile strengths of the joints obtained at different pre-hole offset distances are tested and compared. SEM, EDS and an optical microscope are used to analyze the compositions of the inter-Metallic Compounds and the metallographic structure of the joints, respectively. Results show that the pre-hole offset distance, the thickness of the inter-Metallic Compounds layer and the type of the inter-Metallic Compounds are the key factors that affect significantly the tensile strength of the joints in laser-assisted friction stir welding of steel and aluminum alloy. The tensile strength of joints can be easily guaranteed under such conditions as a proper pre-hole offset distance is used, thin inter-Metallic Compounds layer and iron-abundant inter-Metallic Compounds are formed.