Materials Literature
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Polycrystalline and nanocrystalline samples of the CuCr 2 Se 4 ferromagnetic spinel are synthesized. The mean size of nanocrystals is 50 nm. The Curie temperature of spinel nanocrystals (465 K) is higher than that of spinel polycrystals (435 K). Laser irradiation at a wavelength of 1.5 μm (in an external magnetic fiel…
Photoacoustic (PA) spectroscopy was applied to evaluate the roles of Co and Pr in Zn 2 SiO 4 :Co and Zn 2 SiO 4 :Pr powders in relation to non-radiative transitions. These samples were prepared by dry reaction within an evacuated silica glass tube, where the sintering temperature was 800, 900, or 1000 °C. The Co and P…
Dual inlaid construction of copper interconnect structures involves a sequence of tightly coupled plasma processes with subtle variations in one process impacting subsequent processes. An integrated plasma reactor/feature physics based modeling suite has been applied to three-dimensional (3D) dual inlaid (DI) feature…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
In this paper, an algorithm for the extraction of parameters of Jiles-Atherton hysteresis model is presented. The algorithm proposed is based on the following data: the initial relative permeability, coercivity, remanence initial magnetization curve and the technical value of saturation magnetization.
An examination into a chiral liquid crystal active waveplate device using a one-dimensional model, giving numerical results, is presented. The model calculates the director and flow configuration by minimizing the free energy of the chiral nematic modeled with fixed boundary conditions. The static case of varying the…
The cryogenic distillation applied to the isotope separation of (13C) is a special application, with particular features in both technologies: distillation and isotope separation. Unlike the air or natural gas cryogenic distillation, the inflow of the material with natural abundance in heavy isotope has a minor influe…
Abstract For the RE 13 Zn 58 quasi crystal approximants ( RE = Ce, Pr, Nd, Sm, Gd, Tb, Dy), single crystals were prepared from the elements and their structures were refined from single-crystal X-ray diffraction data. They are derived from the Gd 13 Cd 58 type structure and crystallize in the space group P 6 3 / mmc o…
This paper presents the analysis and measurement results for a high frequency (HF) coaxial transformer with Faraday shield. The simulation results demonstrate that the magnetic flux and eddy current distribution are not impacted by the inclusion of a Faraday shield. The Faraday shield's maximum eddy current density is…
In this paper, we report our most recent results about the huge optical nonlinearity of methyl red (MR)-doped 5CB thin cells. The basic concepts of the surface-induced nonlinear effect interpretation are recalled and possible methods to obtain a better control of the samples response are discussed.
PURPOSE: To determine whether there are differences in the distribution of ionic and nonionic gadolinium-based contrast agents by evaluating contrast enhancement of the physis, epiphyseal cartilage, secondary ossification center, and metaphysis in the knees of normal piglets. MATERIALS AND METHODS: Following approval…
Abstract Since the past few decades, environmental issues have become a serious concern in society. It is a requisite for the industry to minimize waste, in order to protect the environment from being polluted. The term waste here comprises processing waste and post-consumer waste. The amount of processing waste shoul…
High permittivity grainy materials such as ferroelectric and related perovskite ceramics and thin films, in which grain boundaries and/or microscopic cracks occupying very small fraction of the sample volume can result in strong reduction of permittivity and increase of effective phonon frequencies. It is shown how th…
ZnO/ITO/ZnO sandwich structure films were fabricated. The effects of buffer layer on the structure and optical properties of ZnO films were investigated by x-ray diffraction (XRD), photoluminescence, optical transmittance, and absorption measurements. XRD spectra indicate that a buffer layer has the effects of lowerin…
The information on the synthesis of new biologically compatible and biologically degradable DNA carriers based on starlike polymer conjugates of proteins (lysine dendrimers and their derivatives) and hyperbranched polyamino acids is reviewed. Their capacity to bind and compact DNA and to provide for transfection is di…
Reversible tuning of surface plasmon resonance (SPR) of Ag nanoparticles by temperature was achieved using a thermochromic VO2 as matrix. The SPR wavelength (λSPR) was significantly shifted from 506nm for Ag on sapphire to 1070nm for Ag embedded in VO2 at room temperature, giving a large sensitivity factor (ΔλSPR∕Δn)…
The thermomechanical behavior of damaged space shuttle tile thermal protection system is determined using the finite element method. The relative effects of damage on the thermal protection capability and the induced thermal stresses in the TPS are determined by comparing the thermal and structural response of the dam…
Nickel-Titanium (NiTi) alloys exhibit special mechanical properties known as shape memory effect and superelasticity. The first effect relates to the fact that after deformation at low temperature, the material regains its original shape after heating. The second effect denotes an unusual flexibility of the material t…
This paper describes state-of-the-art analysis of grain boundary populations by EBSD, with particular emphasis on advanced, nonstandard analysis. Data processing based both on misorientation alone and customised additions which include the boundary planes are reviewed. Although commercial EBSD packages offer comprehen…
Ecandrewsite-geikielite (Zn 1/2 Mg 1/2 TiO 3 ), ecandrewsite-pyrophanite (Zn 1/2 Mn 1/2 TiO 3 ), pyrophanite-geikielite (Mg 1/2 Mn 1/2 TiO 3 ), and ecandrewsite-pyrophanite-geikielite (Zn 1/3 Mn 1/3 Mg 1/3 TiO 3 ) titanates were synthesized at 900–1000°C at ambient pressure. All of the compounds adopt R — ilmenite-typ…