Materials Literature
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The Tb$_2$Ti$_2$O$_7$ pyrochlore magnetic material is attracting much attention for its {\em spin liquid} state, failing to develop long range order down to 50 mK despite a Curie-Weiss temperature $θ_{\rm CW} \sim -14$ K. In this paper we reinvestigate the theoretical description of this material by considering a quan…
We study theoretically two electron-hole pair states (biexcitons) in core/shell hetero-nanocrystals with type II alignment of energy states, which promotes spatial separation of electrons and holes. To describe Coulomb interactions in these structures, we apply first-order perturbation theory, in which we use an expli…
High frequency characterizations of high-K dielectrics and advanced metal-insulator-metal (MIM) capacitors are presented. This work deals with the impact of process on materials permittivity and the effect of architectures and high-K materials on MIM capacitors electrical performances.
Nd3+:NaLa(WO4)2 crystals with a dimension up to 7 mm were grown from a high temperature solution using a double-crucible method. Scanning electron microscopy observations of the crystals showed that there were no small cracks on the surface of the crystals although they underwent two phase transitions when cooling dow…
Abstract In the present study we investigate microstructures of NiTi-based shape memory alloys (SMAs) using scanning electron microscopy (SEM) in combination with mechanical polishing and electropolishing. The results show that electropolishing is quite useful for microstructural characterization of NiTi-based SMAs re…
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Ultra-low dielectric porous polymer coatings reduce electrical losses of high speed and high frequency circuitries. In this investigation, a room temperature process to produce ultra-low dielectric polyimide films was developed. The films have low elastic properties which reduce thermal stresses and package warpage. T…
Na2O-PbO-Nb2O5-SiO2 glass-ceramic were synthesized by melt-quench process. The crystallization processing of the dielectric phases were carried out at temperature range from 750 to 900 °C. The effects of Na2O content on crystallization and dielectric properties of Na2O-PbO-Nb2O5-SiO2 glass-ceramic were investigated by…
This paper presents a modified Split Hopkinson Pressure Bar(SHPB) technique to obtain compressive stress-strain data for a rubber material. An experimental technique with a modified the conventional SHPB has been developed for measuring the compressive stress strain responses of materials with low mechanical impedance…
"El objetivo de la cardiomioplastia celular es regenerar el miocardio mediante el implante decélulas vivas. Sin embargo, en corazones isquémicos hay alteraciones en la matriz extracelular.El colágeno tipo I, responsable del soporte estructural, disminuye desde el 80% al 40%,mientras que el colágeno tipo III aumenta de…
This paper explores the use of single-walled carbon nanotubes (SWCNTs) as a gas sensor for detecting organic gas molecules. A low-temperature dielectrophoresis (DEP) method is employed to combine CNTs with Transimpedance Amplifier (TIA) based on UMC 0.18 um 1P6M CMOS process into a nanosensor device.
Electron paramagnetic resonance (EPR) studies of Mn 2+ impurity in single crystals of diammonium hexaaqua magnesium(II) sulfate have been carried out at 9.3 GHz (X-band) at room temperature. The EPR spectra exhibit a group of five fine structure transitions. The spin-Hamiltonian parameters were determined. Mn 2+ enter…
Threshold stress intensity factor or KIH required to initiate a delayed hydride crack in the axial direction of a Zr-2.5Nb tube was determined at temperatures of 160 oC to 280 oC. KIH remained constant at temperatures from 160 to 250 oC, increased with an increasing temperature in excess of 280 oC using a load decreas…
Porous silicon has many properties useful for optics applications, which include an ability to produce thin films with a wide range of refractive indices and the ability to easily fabricate multilayer structures. However porous silicon does have some non-optimal properties due to the very nature of its porous structur…
We have studied the effect of hydrogenation on the electrical properties of InSe layered crystals and their anisotropy. Hydrogenation has been shown to reduce the in-plane electron mobility in InSe and to raise its in-plane electrical conductivity and electron concentration. The decrease in anisotropy upon InSe hydrog…
The spin Hamiltonian parameters (g factors g || , g⊥ and hyperfine structure constants A || , A⊥) of Zr 3+ on the tetragonal M 3+ (M = Sc, Lu, Y) sites of zircon-type orthophosphate MPO 4 crystals are calculated by high-order perturbation formulas of d 1 ions in tetragonal symmetry. The crystal-field parameters are es…
Abstract Elution fractionations of broadly molar mass-distributed, hyperbranched poly(urea-urethane)s with OH- and Ph- end groups were carried out to obtain a number of macromolecular samples possessing different molar masses at the same chemical structure. The characterization of the polymers was performed by SEC, MA…
The ab initio, semi-empirical, density functional theory (DFT) calculation methods of quantum mechanics, and the basic theories of molecule mechanics were discussed. The molecular dynamics (MD), Monte Carlo (MC) methods of molecular simulation and the commonly used hierarchical approach in catalyst research were revie…
The Heusler alloy Co2MnSi with theoretically predicted 100% spin polarization has been successfully implemented in Co2MnSi∕AlOx∕Co7Fe3 magnetic tunnel junctions recently. Here we investigated 100 nm thick Co2MnSi films grown on a vanadium buffer and capped by a thin alumina film. This stack is similar to the lower ele…
The effect of plasma treatment on the surface characteristics of polyamide fabrics was investigated. Plasma surface modifications with carbon dioxide and argon were performed on the polyamide 6 fabrics to improve the adhesion and hidrophylity. The surface morphology of the fiber was observed with scanning electron mic…