Materials Literature
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Two HSS grades (A and B) belonging to the complex system Fe-Cr-C-Si-X, where X is a strong carbide-forming element such as V, Mb or W, were studied. Samples in the as-received conditions came from an industrial spin casting process, with a varying cooling rate during processing. Chemical compositions of both alloys we…
We have recently investigated the optical Kerr constant (n2) of azo-dye-doped nematic liquid crystal (ADDLC) and polymer-dispersed liquid crystal (ADDPDLC) films using the Z-scan technique. The measurements of ADDLC samples are firstly performed with the simultaneous application of two pump beams, which are referred a…
The reported algorithm determines the exact exchange potential ${v}_{\mathrm{x}}$ in an iterative way using energy shifts (ESs) and orbital shifts (OSs) obtained with finite-difference formulas from the solutions (occupied orbitals and their energies) of the Hartree-Fock-like equation and the Kohn-Sham-like equation,…
An exact description of the distribution of 2D bimetallic clusters deposited on a square substrate has been obtained via an exact inventory algorithm. We show that several features of the monometallic distribution can be altered by the presence of a second species within the clusters. The diagram of ground-state morph…
This paper presents an efficient search method for equivalent thin film filter realization to a given design under boundary conditions. To calculate realizations, the algorithm presented in [1] is used and the boundary conditions are given in the form of refractive index intervals. Since the number of possible solutio…
We propose a single panel liquid crystal (LC) device that is switchable between reflective and transmissive modes. Operation in the reflective mode can be achieved by applying a vertical field to a dye-doped LC device, whereas the device can be in-plane switched for operation in the transmissive mode. Image inversion…
Identification of the constants of material models is always a concern. In the present work, a combined experimental, numerical and optimization technique is employed to determine the constants of Zerilli-Armstrong model. The experiments are conducted on a compressive Hopkinson bar, the simulations are performed using…
대면적 대기압 플라즈마 반응 장비를 플라즈마-용액 시스템에 적용하여 액상 내부에 잠입된 폴리프로필렌(PP) 필름의 표면손상 없이 관능기 도입 가능성을 탐색하였다. 액상으로 1-butyl-3-methylimidazolium tetrafluoroborate: $[BMIM]^{+}[BF_{4}]^{-}$ 이온성 액체 수용액을 사용한 경우, 안정적으로 플라즈마를 발생시킬 수 있었다. PP 필름의 플라즈마 처리 결과, PP 표면에 다양한 산소 함유 관능기들이 도입되었음을 확인할 수 있었다. 플라즈마 처리 후 PP의 표면 자유에너지는 처리시간, 전압의 증가에 따라서 증가하며,…
In this research hydroxyapatite powder was synthesized by wet chemical method using calcium nitrate and diammonium hydrogen phosphate precursors at 2, 20, 50 and 90⁰ C. Phase composition, morphological aspects and particle size have been investigated using X-ray diffraction method (XRD), Fourier transform infra red sp…
Magnetic structure in a layered perovskite manganite, La2-2xSr1+2xMn2O7 (x = 0.307) has been investigated by neutron diffraction measurements. We found that the ground state (at 4 K) has a ferromagnetic structure with magnetic moment of Mn ions being aligned in a direction inclined by 10 degree from the c-axis. The ma…
We study structural and nonlinear optical properties of lyotropic ionic liquid crystals with electrochromic impurities and mesomorphic glasses of the homological series of Co alkanoates. Nontraditional nonlinear optical mechanisms of these materials are proposed. The investigated cells are characterized by high value…
Abstract The corrosion behavior of Ti-35Nb-7.2Zr-5.7Ta (TNZT) and Ti-35Nb-7.2Zr-5.7Ta-0.5B (TNZTB) alloys subjected to different heat treatment conditions was investigated in Hank's solution. Depending on the heat treatment conditions, the microstructure of the water-quenched, single-stage aged or duplex aged samples…
Dissimilar joints between CP-Ti and 304stainless steel were produced using diffusion welding technique in the temperature range of 800-950 °C, under a uniaxial pressure of 7 MPa in argon atmosphere. Mechanical assessment of the joints was carried out employing shear testing. The shear strength was found to be a functi…
In classical models of microstructural evolution, the natural dispersion existing in the samples is often neglected. In this paper, we propose a general model that takes into account the dispersion. This model is applied to two cases of phase transformations in steels: the first one concerns the bainitic transformatio…
The flow behaviour of material is strongly influenced by the microstructure evolution during hot deformation processes. In this work, a comprehensive mathematical modelling of heat transfer and plastic deformation was carried out employing finite element analysis based on rigidviscoplastic formulation. Semi-empirical…
Abstract Lithium niobate (LiNbO3 – LN) is a large bandgap [3.78 eV at room temperature (RT)] semiconductor mainly known by its ferroelectric behaviour and excellent non‐linear optical, electro‐optical and piezoelectric properties. In this study 91SiO2–4Li2O–4Nb2O5–1Sm2O3 (mol%) glasses were prepared by sol–gel. Glass–…
The perovskite (Na1/2Bi1/2)TiO3 (NBT) undergoes a series of structural and polar transitions starting from the high temperature paraelectric phase: tetragonal paraelectric, tetragonal antiferroelectric, rhombohedral antiferroelectric and finally rhombohedral ferroelectric, according to neutron diffraction and dielectr…
Enhanced Performance of GaN-Based Vertical Light-Emitting Diodes with Circular Protrusions Surmounted by Hexagonal Cones and Indium–Zinc Oxide Current Spreading Layer, Lee, Wei-Chi, Wang, Shui-Jinn, Wang, Pei-Ren, Uang, Kai-Ming, Chen, Tron-Min, Kuo, Der-Ming, Wang, Po-Hung
Despite the tremendous success of phase-field (PF) modelling in predicting many of the experimentally observed microstructures in solids, additional progress is required in order to apply it to predict microstructure evolution in real alloy systems. One way to achieve this is to couple thermodynamic and kinetic databa…
8th Conference on Polymer Solvent Complexes and Intercalates (POLYSOLVAT), Molecular Crystals and Liquid Crystals ISSN : 1542-1406, DOI : 10.1080/15421406.2011.572019, Issue : 1, Volume : 545, pp. 220-229, 2011.