Materials Literature
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Fractals have been very successfully used to address the problem of modeling and to provide a description of naturally occurring phenomena and shapes, wherein conventional and existing mathematical models were found to be inadequate. The geometrical patterns of dielectric breakdown like electrical trees, surface disch…
The finite-element method has been used to study the thermal stress distribution in large-sized sapphire crystals grown with the sapphire growth technique with micro-pulling and shoulder-expanding at cooled center (SAPMAC) method. A critical defect model has been established to explain the growth and propagation of cr…
The porphyrin-ferrocene conjugates ( P-nFc; n = 1, 2 and 4 ), which are simple examples of a donor-acceptor charge separation system, were synthesized. Their photoindued intramolecular and intermolecular processes have been investigated by time-resolved emission and nanosecond transient absorption techniques. Upon exc…
This paper reports functionalization of CNF via a Diels-Alder addition reaction and the characterization of the obtained materials. The functionalization was assessed by a calorimetric technique (DSC) and the morphology of CNF modified materials was characterized by scanning electron microscopy (SEM) and transmission…
In a systematic parametric study 3D MHD flows in expansions of rectangular ducts with different expansion ratios, expansion lengths, and various wall conductivities are analyzed for fusion relevant parameters in order to establish a data base useful for the design of liquid metal blankets for fusion reactors. In curre…
Melt extrusion was used to prepare glycerol-plasticised dry thermoplastic starch (DTPS) in a single-screw extruder. Glycerol combined with water-plasticised starch (TPS) was studied as a standard. Citric acid (CA) was used to accelerate the plasticization of DTPS. Scanning electron microscopy revealed that residual gr…
The high frequency characteristics, the complex permittivity in particular, of water- tree degraded XLPE insulation in power cables are determined using a two port measurement method. The insulation samples are obtained from both laboratory made samples and those from ex-service cables. The electrical measurements are…
A new zinc calix[4]arene-bis-porphyrinate was synthesized and its 1 : 1 and 1 : 2 complexation reaction with ehtylenediamine, diethylenediamine, and triethylenediamine in toluene at 298 K was studied by spectrophotometric titration and 1 H NMR.
Stress relaxation test (SRT) is very useful to study the dislocation dynamics and thus the deformation behavior. It becomes quite difficult to use conventional testing methods when the material availability is limited. In such instances, miniaturized specimen testing procedures such as shear punch test (SPT) becomes s…
A new class of helium-cooled high heat-flux plasma facing heat exchanger (HX) concept is presented. These unique “Foam-In-Tube” HX concepts are composed of a thin tungsten shell integrally bonded to an open-cell tungsten foam core. High heat flux tests show maximum heat loads of 22.4 MW/m2 using 4 MPa helium at a flow…
Severe plastic deformation (SPD) is a method of converting coarse grained metals into ultrafine grained metals, which possess improved mechanical and physical properties. However, none of the many proposed SPD processes have, as yet, gained a commercial acceptance. The finite element method (FEM) is an invaluable tool…
The aim of the present paper is to construct and study a model of pair moment interaction between carbon atoms in the two-dimensional graphite lattice. The carbon atom is modeled by a structure consisting of three rigidly connected mass points located at the vertices of an equilateral triangle. The interaction between…
Liquid Crystal Alignment Effects for Nematic Liquid Crystal on Homeotropic Polyimide Surface Using New Ion-Beam Source, Kang, Dong-Hun, Kim, Sang-Hoon, Kim, Byoung-Yong, Kim, Jong-Yeon, Ok, Chul-Ho, Kim, Young-Hwan, Han, Jin-Woo, Kim, Jong-Hwan, Hwang, Jeoung-Yeon, Oh, Byeong-Yun, Han, Jeong-Min, Lee, Sang-Keuk, Lee,…
The cast alloy Al-0.63wt.% Cu was subjected to different number of equal channel angular pressing (ECAP) passes. Fatigue properties and shear bands on the surface of the alloy after fatigue were investigated. It is found that the ECAPed Al-Cu alloy displays obvious cyclic softening. Meanwhile, multipass ECAP treatment…
We report observation of stimulated emission from ZnO microtubes pumped by multiphoton absorption using intense femtosecond pulses at wavelength around 800nm. Band edge emission, together with second harmonic generation, was observed and several stimulated emission peaks with linewidths of 0.5–0.7nm appeared at high e…
We have studied the magnetic, structural, and dielectric properties of a single crystal of $\mathrm{Cu}{\mathrm{B}}_{2}{\mathrm{O}}_{4}$. We show that both reported magnetic transitions are observable in the magnetization, irrespective of the measured direction of the crystal. This is in agreement with recent neutron…
A homologous series of fluoro‐substituted chiral liquid crystals derived from (S)‐lactic acid and alkoxyethanols were prepared for investigation. Mesophases and their corresponding transition temperatures were identified by polarized optical microscopy and differential scanning calorimetry. The compounds exhibit a bro…
Poly(2,2-Dimethyl-3,4-propylenedioxythiophene) (PProDOT-Me2) thin films have been cyclovoltametrically coated onto carbon fiber microelectrode (CFME) as an active functionalized microelectrode. An electrochemical impedance spectroscopic study on the prepared electrodes is reported in this paper which electropolymeriza…
The concept of geometrical frustration is recalled, in particular in the case of frustrated icosahedral order. The curved space approach allows one to relax the frustration at the price of curving the underlying space. Topological defects are then introduced to produce a realistic structure in R 3 . In this paper we f…
We report room-temperature ferromagnetism in ∼11.4–14.6nm nanoparticles of La0.5Sr0.5Ti0.985Fe0.015O3−δ. Nanoparticles of undoped and Fe-doped samples were synthesized by a polymerized complex method and were characterized using x-ray diffraction, transmission electron microscopy, and vibrating-sample magnetometer. Th…