Materials Literature
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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…
Les polyimides sont des polymères a hautes performances souvent utilisés dans des environnements dits hostiles (hautes températures et hautes pressions, forts frottement, …). Ils sont connus pour leur forte résistance thermique et chimique mais aussi pour leur faible processabilité. La technique de synthèse la plus ut…
Les materiaux nanocomposites poreux organises presentent de nombreuses proprietes dans le domaine de l’adsorption. Cette etude est portee sur la synthese de materiaux poreux de grande aire specifique fonctionnalises par des nanoparticules metalliques en visant des applications dans le domaine de l’adsorption: en phase…
Am Beispiel von Schweine haltenden Betrieben konzentriert sich die Studie auf die besonderen Gegebenheiten, die aus einer intensiven Tierhaltungsregion (ILA = Intensive Livestock Area) und deren dynamischen Entwicklungen für die betrieblichen Stoffströme resultieren. Auf Basis einer detaillierten Bilanzrechnung des be…
In this work, we investigated the activity and selectivity of copper catalysts supported on zirconium oxide, obtained by different preparation methods, in the ethanol dehydrogenation reaction. From the ethanol, the most important products are ethyl acetate and acetaldehyde, because they have high valuable and are in t…
Abstract In this study, the fluids were composed with increased mole fractions of a mixture of molten salt: heavy metals 99 – 95 % Li20Sn80−1 – 5 % SFG-Pu, 99 – 95 % Li20Sn80−1 – 5 % SFG-PuF4, 99 – 95 % Li20Sn80−1 – 5 % SFG-PuO2. In this study, the effect on conversion of each isotope (238–242Pu) in spent fuel grade p…
The hydrogenated amorphous carbon films (a-C:H) were deposited on p-type Si (100) substrates at different thicknesses by radio frequency plasma enhanced chemical vapor deposition technique (rf-PECVD). Raman spectra display asymmetric diamond-like peaks, representative of the a-C:H films. The decrease of intensity ID/I…
Violet Sr–Al–O:Eu2+ phosphor particles were synthesized from a metal–ethylenediaminetetraacetic acid (EDTA) solution of Sr, Al, Eu, and particulate alumina via spray drying and sintering in a reducing atmosphere. The crystal structures and emission properties at 85–300 K were investigated. The composition of the viole…
During failure analysis of modern integrated circuits it might be necessary to carry out investigations, including both analysis of the die topology and the input of electrical signals on its contact pads. However, during access to the die the contact pads might be damaged due to different factors. In present work sev…
This paper presents results for films of CuAlxOy were deposited on the sapphire by reactive magnetron co-sputtering using DC applied to the high-purity Cu target,RF applied to the high-purity Al target.Copper aluminum oxide film (CuAlxOy) is transparent for infrared and conductive. The properties of the films are infl…
En la presente memoria de tesis doctoral se muestran y discuten los principales resultados de la investigacion realizada en micro- y nanoestructuras de ZnS. Este material, perteneciente a la familia de los semiconductores II-VI, presenta unas propiedades fisicas interesantes, entre las que destacan su banda de energia…
In this article, another thin film named white graphene is introduced, containing its properties, preparation and potential applications. White graphene, which has the same structure with graphene but quite different electrical properties, can be exfoliated from its layered crystal, hexagonal boron nitride. Here two p…
A study of copper (Cu) diffusion into silicon substrates through TaNx and Ta/graded Ta(N)/TaN multilayer diffusion barriers was investigated based on an experimental approach. TaNx and Ta/graded Ta(N)/TaN thin films were deposited by magnetron sputtering under argon (Ar) and Ar-nitrogen (N) plasma. The influence of th…
Optical, dielectric, thermal, physico-mechanical properties of new fluoro-containing alicyclic polyimides were investigated. High optical transparency in visible and UV ranges of the films with thickness 10-25 μm, which lower boundary was registered at 125-260 nm; as well as reflectivity index being 1.492-1.515 were r…
Paramagnetic relaxation in strongly anisotropic materials is analytically investigated in zero and weak constant magnetic fields. The objectives of the microscopic analytical investigation are (i) the weak-field electron paramagnetic resonance (EPR) linewidth and (ii) the electron spin relaxation rates given by a calo…