Materials Literature
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The behavior of cavitation bubbles in tissue driven by ultrasonic fields is an important problem in biomedical acoustics. The present solution combines the Keller‐Miksis equation for nonlinear bubble dynamics with the linear Voigt model for viscoelastic media and experimental values for the model’s parameters (rigidit…
This paper describes the fundamental process design for achieving microcellular foams using low-density polyethylene (LDPE) in extrusion. Microcellular foams are classified as foams with cell densities larger than 10 9 cells/cm 3 and cell sizes in the order of 10 micrometers. Supercritical CO 2 was used as a blowing a…
was prepared by a precipitation method followed by heat treatment at . The material showed an initial discharge capacity of , which decreased to after 30 cycles. X-ray diffraction showed an irreversible structural change of the material from crystalline to amorphous phase after the first cycle. Contrarily, Raman scatt…
The thermal management of electronics is becoming an increasing concern as industry continues to simultaneously push performance while shrinking the size of electronic devices. Microchannel cooling is a promising technology to accommodate the heat dissipation rates and associated fluxes projected for future generation…
Mixed crystals of (NH 4 ) 2 SbF 5 -K 2 SbF 5 , an electro-optic material have been grown by isothermal evaporation technique. Powder X-ray diffraction method has been used for structural identification and determination of lattice parameters. Load dependent microhardness measurements on this crystal reveal the mechani…
AbstrAct Purpose: Purpose of this article is to extend a complex evaluation of magnesium alloys which requires very often knowledge of elastic-plastic properties at elevated temperatures. These properties are connected with microstructure that is influenced by metallurgical and technological factors and conditions of…
The synthesis and crystal structures of [Co4Na2(HL)2(H2L)2(MeOH)4] and [Co5(HL)2(H2L)2] are reported as the first examples of polynuclear transition metal complexes assembled using partially-deprotonated Bis-tris {2-[bis(2-hydroxyethyl)amino]-2-(hydroxymethyl)propane-1,3-diol, H5L}.
The principles of social and biological evolution have been combined in a Cultural Differential Evolution hybrid global optimization technique and applied to crystal structure solution.
Mesostructured silicates containing metal nanoparticles have been synthesised via templating around a pre-formed, metal-containing mesophase using a non-ionic surfactant.
Papers are discussed in which the quantum dynamics of individual molecules and semiconductor nanocrystals is studied from their fluctuating fluorescence. Presented are the fundamental tenets of the theory of photon emission by a single nanoparticle irradiated by continuous laser light. Fluorescence fluctuations which…
A new pixel structure with twice-bent beams and eaves structure, suitable for high-resolution uncooled infrared (IR) focal plane arrays (FPAs), is proposed. In comparison with previous results (FPA of 37-µm pixel pitch), the thermal conductance of the test device with the proposed pixel structure of 23.5-µm pitch is r…
A new organic nonlinear optical co-crystal based on analogous configurationally locked polyene chromophores with noncentrosymmetric packing exhibits a large macroscopic second-order nonlinearity with tailored physical properties.
The stress reduction behavior in metal-incorporated amorphous carbon films was investigated by the first-principle calculation. We calculated the total energy of the system with changes in bond angles between the incorporated metal (Ti, Mo, Cr, W, Ag, Au, Al, Si, etc) and the carbon atoms by using DMOL 3 computational…
Vacuum degassing is essential in the preparation of RS P/M aluminum alloys to remove adsorbates and for the decomposition of hydrated-Al2O3 on the powder surface. Changes in the surface characteristics during vacuum degassing were investigated by X-ray photoelectron spectroscopy and temperature-programmed desorption m…
Microstructures and magnetic domain structures of precipitation-hardened Sm(Co0.720Fe0.200Cu0.055Zr0.025)7.5 permanent magnets obtained by various heat treatments are investigated by transmission electron microscopy (TEM). It is found that Cu atoms gradually segregate into SmCo5 phase with the increase in aging time.…
The Sn-Cu binary eutectic alloy is one of candidate alloys for lead-free solder. In order to investigate the evolution of solidified structure of Sn-Cu binary eutectic alloy, the unidirectional solidification technique has been applied using a Bridgman type furnace. Primary β-Sn exhibits dendrite morphology, on the ot…
In this molecular-dynamics study, we present the simulated growth of thin a-C:H films using the Brenner [(Phys. Rev. B 42, 9458 (1990)] potential. These simulations are relevant for the growth of thin films, grown using low-energy hydrocarbons. In this work, we investigate the reaction mechanisms of both the linear an…
Abstract The experimental IR (in different matrices) and Raman spectra of 4‐aminobenzonitrile molecule were recorded. The results were compared with theoretical values. Geometry, vibrational wavenumbers and thermodynamic parameters were calculated using DFT quantum chemical methods. With the help of specific scaling p…
Influence of oxygen content on the microstructure and thermoelectric properties of bismuth-telluride based (Bi,Sb)2(Te,Se)3 alloys has been investigated. The consolidated specimens in a disc form of 10 and 26 mm in diameter and 8 mm in height were prepared by hot-pressing of rapidly solidified foils produced by a sing…
Upon combining 5,10-dipyridyl-15,20-diphenylporphyrin 1 or its copper metallated complex 2 with metal halides (MX2: M = Zn, Cd, Hg; X = I or Br) five [2 + 2] metallamacrocycles of the square type were obtained and structurally characterised in the crystalline phase by X-ray diffraction methods. Whereas the free porphy…