Materials Literature
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Exposure buildup factor (EBF) and energy absorption buildup factor (EABF) for some building materials (cement, clay brick, thermiston, gypsum and ordinary concrete) available in Iraq at the photon energy range 0.015-15.0 MeV up to penetration depth 40 mfp has been calculated using five parameter geometric progression…
We describe a practical design of an ultra-compact on-chip superconductive micro-resonator as a potential magnetic element of metamaterial. The achieved resonator size with respect to the wavelength in our experiment is about λ/ 14400. The resonator consists of two superconducting Nb spirals, sandwiched face to face,…
One of the most serious problems encountered in poly(vinyl chloride) (PVC) processing is due to low thermal stability of the PVC. The purpose of the study was to determine the effect of LDPE and flame retardant on to the electrical and thermal nanocomposites properties The nanocomposites were prepared using a laboplas…
A curcumina e um corante natural amarelo – alaranjado extraido do rizoma da Curcuma longa. Trata-se de um polifenol com importantes efeitos biologicos comprovados por estudos cientificos, atuando como um potente antioxidante, inibindo a formacao de celulas cancerigenas, alem de possuir efeito antiinflamatorio. O empre…
8.1 ▪ A Unified Numerical Approach for the Nonlinear Schrödinger Equations 8.1.1 ▪ Introduction A new method for analyzing boundary-value problems for both linear and integrable nonlinear partial differential equations (PDEs) was introduced by Fokas in [1] and extended by several authors; see [2]. This method is usual…
An innovative new fuel tank was tested using a Direct Methanol Fuel Cell (DMFC). The aim of the fuel tank was to provide a fuel supply to the cell in all orientations while simultaneously capturing the carbon dioxide produced by the system in order to maintain a positive fuel pressure at all times.
The objective of this work was to synthesize and characterize amphiphilic copolymers based on poly(ethylene glycol) (PEG) and poly(lactic acid) (PLA) intended for drug delivery applications. The polymers were chosen regarding to their biocompatibility and bioresorbability. Different architectures of amphiphilic copoly…
Direct Methanol Fuel Cells have been a promising source of alternative energy as the supply of conventional fuels is slowly being diminished. At the heart of this electrochemical cell a Proton Exchange Membrane laced with a Pt and Pt-Ru catalyst creating a redox reaction. The mechanical properties and composition of t…
Les courroies etudiees subissent des sollicitations mecaniques complexes et des variations thermiques jusqu’a 160°C. Pour ameliorer leurs durees de vie, les proprietes de l’interface entre le câble PA 4,6 adherise RFL et la matrice EPDM doivent etre optimisees. Dans ces travaux, les courroies ont subi un endommagement…
Mixed carbides (U, Pu)C, are good fuel candidate for IVth generation reactors because of their high fissile atoms density and excellent thermal properties for economical (more compact and efficient cores) and safety reasons (high melting margin). UC can be imagine as a surrogate material ror R&D studies on (U,Pu)C fue…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionCorrection to "Transport of Triplet Excitons along Continuous 100 nm Polyfluorene Chains"Xiang Li, Matthew Bird, Gina Mauro, Sadayuki Asaoka, Andrew R. Cook, Hung-Cheng Chen, and John R. Miller*Cite this: J. Phys. Chem. C 20…
Protein Evolution Small molecules that change the oligomeric state of proteins by binding to a site distant from the interface are called allosteric. They often act by taking advantage of intrinsic protein dynamics and stabilizing a particular conformation of the protein. Perica et al. show that
Catalysis In order to maximize the activity of precious metals in catalysis, it is important to place the metal on some support with a high surface area (such as a zeolite) and to maintain the metal as small clusters or even atoms to expose as much metal as possible. The latter goal is more readily achieved with oxide…
Nanomaterials The high activity of precious metals such as platinum for reactions that occur in fuel cells can be enhanced by alloying with metals such as nickel and cobalt to form shaped nanoparticles, where platinum is concentrated at the corner and edge sites. Gan et al. used a combination of high-resolution imagin…
This paper presents a three-dimensional constitutive model for a shape-memory alloy that generalizes the behaviour of Nickel-Titanium transformation whilst subjected to heat, then cooling processes. This model is able to predict the behaviour of Shape Memory Alloys (SMAs) wires under complex thermo-mechanical loadings…
obtenção do título de Mestre.
Les nouvelles avancées théoriques et technologiques basées sur les nanotechnologies ont permis de remettre au goût du jour la récupération d'énergie utilisant la thermoélectricité. Dans le cas de dispositifs en couches minces, des applications telles que la micro-génération de puissance ainsi que le refroidissement lo…
We synthesized shell thickness tunable hollow Cu2O to study diffusion length of Cu2O lattice oxygen in thermite reaction of Al/CuO composite. First, we synthesized monodisperse Cu nanoparticles with average diameter 36.5 ㎚. Hollow Cu2O is obtained via oxidation of Cu nanoparticles and formation of void from Kirkendall…
Hydrogenated amorphous carbon (a-C:H) films have been synthesized by a radio frequency plasma enhanced chemical vapor deposition (rf-PECVD) technique with different bias voltage from 0.0 to -0.5 kV. The Raman spectra displayed the polymer-like hydrogenated amorphous carbon (PLCH) film with 0.0 to -0.1 and a-C:H films…
In this study the physical properties such as the thermal conductivity, thermal diffusivity, porosity and density of the epoxy composites were characterized as a function of weight fraction of granite. According to the test results, addition of granite increases the thermal properties of the composites. This is due to…