Materials Literature
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Wide band gap semiconductors doped with rare earth ions (RE) have shown great potential for applications in optoelectronics, photonics, and spintronics. The 1.54μm Erbium (Er) emission has been extensively utilized in optical fiber communications, and Europium (Eu) is commonly used as a red color component for LEDs an…
Crystalline particle coatings can provide critical enhancement to wide-ranging energy and biomedical device applications. One method by which ordered particle arrays can be assembled is convective deposition. In convective deposition, particles flow to a surface via evaporation-driven convection, then order through ca…
The experimental study presented in this paper aims to select the most suitable cutting and offset parameter combination for a milling process in order to obtain the desired surface roughness value for a machined workpiece of chromium 210 Cr12 steel, in terms of cutting speed, feed rate and depth of cut for the millin…
The optical constants (refractive index, n; extinction coefficient, k and dielectric constant, epsilon) of the complexes of oxi-imino alcohol ligand are determined using reflectance and transmittance spectra. Analysis of the basis absorption spectra is also carried out to determine optical band gap (E-g) and Urbach pa…
Two models which can predict the voltage dependent scattering from Liquid Crystal (LC) based reflectarray cells are presented. The validity of both numerical techniques is demonstrated using measured results in the frequency range 94 - 110 GHz. The most rigorous approach models, for each voltage, the inhomogeneous and…
Fracture behavior and fracture toughness of metal particle dispersed alumina matrix composites are investigated. Ni, Ni5Aland CoNiCrAlY particles are used for the composites. Volume fraction of the metal particles is ranging from 5 to 20 vol.Microstructures before and after heat exposure are observed from the surfac…
Lanthanum Indium Oxide (LaInO3) is a rare-earth oxide perovskite known to exhibit luminescence under UV excitation in its bulk form. However till date no attempt has been made to fabricate its thin films. In the present work, our emphasis is on fabrication of thin films of LaInO3 by using pulsed laser deposition techn…
Lanthanum Indium Oxide (LaInO3) is a rare-earth oxide perovskite known to exhibit luminescence under UV excitation in its bulk form. However till date no attempt has been made to fabricate its thin films. In the present work, our emphasis is on fabrication of thin films of LaInO3 by using pulsed laser deposition techn…
Nanocomposite thin films composed of oriented Co_<50>Pt_<44>Cu_6 nanoparticles embedded in a MgO matrix has been synthesized by rf-magnetron co-sputtering onto NaCl(001) substrates kept at 620 K. As the sputtering power increases, (001) orientation is improved and atomic ordering is also promoted. However, superlattic…
The magmatic rocks of the Nefza district located in the NW part of Tunisia belong to a Neogene volcanic complex. It includes fresh rhyodacites weathered into kaolinite and/or halloysite, and nontronite. Chemical analyses of rhyodacites compared to the nontronite phase reveal an evolution in the composition in term of…
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Microstructure and phase decomposition of hexagonal ¡A martensite in cold groove rolled (CGR) Ti12 mass%V2 mass%Al alloys have been studied by transmission electron microscopy and electron diffraction.Acicular structure of the ¡A martensite changes into equiaxed ¡A grains by CGR with a cold reduction of 75%.After agin…
Gluconacetobacter diazotrophicus is a gram-negative and endophytic nitrogen-fixing bacterium that has several beneficial effects in host plants; thus, utilization of this bacterium as a biofertilizer in agriculture may be possible. G. diazotrophicus synthesizes levan, a D-fructofuranosyl polymer with β-(2→6) linkages,…
El fique es una fibra natural biodegradable. En este artículo se estudia la absorción acústica y la conductividad térmica del fique.
This paper describes the development and the wind tunnel test of a variable geometry morphing airfoil using corrugated structures. Proof-of-concept study of a morphing wing with corrugated flexible seamless flap-like structure is verified by finite element analysis, and a prototype is manufactured using carbon fiber r…
It has been realized that resonance frequencies of imperfect acoustic cloaking based on a small perturbation of the transformation acoustics in ℝ 2 are located near Dirichlet eigenvalues of the cloaked region [Chin. Phys. Lett. 26 (2009) 014301 ; 29 (2012) 124301 ]. In this work, we study the performance of the three-…
Currently, cell culture systems that include nanoscale topography are widely used in order to provide cells additional cues closer to the in vivo environment, seeking to mimic the natural extracellular matrix. Electrospinning is one of the most common techniques to produce nano fiber mats. However, since many sensitiv…
Rural state highways in the Hawkes Bay region of New Zealand present a significant engineering challenge to maintain safe, skid resistant road surfaces. This is a result of tight curvilinear alignments, heavy commercial traffic that travels at comparatively high speed and local surfacing aggregates with a relatively l…
The potassium double tungstates KY(WO4)2, KGd(WO4)2, and KLu(WO4)2, are excellent host materials for rare-earth (RE) doped waveguide amplifiers and lasers, because RE ions exhibit very large absorption and emission cross-sections in these materials. Already the first planar waveguide laser demonstrated in KY(WO4)2:Yb3…
Abstract : The objective of this project is to develop an in-depth understanding of the influence of extrinsic and intrinsic microstructural parameters on dynamic response and failure behavior of Al-Cu alloys through carefully planned and fully instrumented parametric experiments and detailed microstructural character…