Materials Literature
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Traditionally, electric generators, driven by an aircraft's main propulsion engines or by a gas turbine auxiliary power unit (APU), have supplied the electrical needs of commercial aircraft. In flight, the marginal efficiency of electric power generated by the main engines and their generators is at most 30-40%. While…
Abstract Segmented polyurethane ureas (SPUUs), which are being used in implant devices, were evaluated as drug delivery matrices using theophylline as a model drug without much sacrificing the mechanical properties of films after drug doping. SPUUs were synthesized from aliphatic diisocyanate (lysine methyl ester diis…
The nanostructure and photoluminescence of polycrystalline Er-doped Y2O3 thin films, deposited by radical-enhanced atomic layer deposition (ALD), were investigated in this study. The controlled distribution of erbium separated by layers of Y2O3, with erbium concentrations varied from 6to14at.%, was confirmed by elemen…
Abstract The nucleation and crystallization of two types of strongly segregated poly(lactide)‐ block ‐polyethylene diblock copolymers with an approximate 50/50 composition has been investigated. One material contains an amorphous PLDA block (PLDA‐ b ‐PE) and the other contains a semicrystalline PLLA block (PLLA‐ b ‐PE…
High-purity transparent conductive Al-doped ZnO (AZO) films were grown by KrF excimer pulsed laser deposition. We used ultraviolet and X-ray photoelectron spectroscopes to directly measure the absolute values of the vacuum work function of AZO films. The structure and electrical and optical properties of the as-grown…
This paper deals with an estimation manner of charge quantity of partial discharge (PD) in GIS by PD-induced electromagnetic (EM) wave measured with UHF method. Charge quantity of PD is important to understand PD activity or condition for insulation diagnosis, and the charge estimation by UHF method could contribute t…
The inability to transduce cellular membranes is a limitation of current magnetic resonance imaging probes used in biologic and clinical settings. This constraint confines contrast agents to extracellular and vascular regions of the body, drastically reducing their viability for investigating processes and cycles in d…
Nanostructures of hexagonal MoS 2 thin films synthesized using air‐stable, single‐source molecular precursors of molybdenum dithiocarbamates are reported. On increasing the length of the substituent alkyl groups of the precursor, changes in the type of structures grown under similar growth conditions can be observed (…
Abstract We report the first finding of berthierine and chamosite in Mexico. They occur in the iron-ore deposit of Peña Colorada, Colima. Their genetic characteristics show two different mineralization events associated mainly to the magnetite ore. Berthierine is an Fe-rich and Mg-low 1:1 layer phyllosilicate of hydro…
Corrosion-resistant alloys (CRA) have been developed to withstand severe corrosive production environments that the oil and gas industry has been facing in the last few decades. CRA alloy design has been carried out based on spontaneous passivity mechanism in carbon dioxide (CO2) and/or hydrogen sulfide (H2S) containi…
Abstract The basic properties of high‐quality CVD diamond film make them very interesting for a wide range of detectors: they are radiation hard, provide fast signals, show very low leakage current even in high radiation environments, have excellent thermal properties and can be manufactured as free‐standing detectors…
Cr-doped BiFeO 3 (BFO) thin films were formed by depositing sol–gel solutions on Pt/Ti/SiO 2 /Si(100) structures. Cr-doping up to 6 at % was effective in suppressing leakage current in the high electric field region and in increasing the remanent polarization. In a 3 at % Cr-doped 350-nm-thick BFO film, the remanent p…
Nano has now become a theme in almost all the established discipline. The confluence of innovative methodologies, sophisticated characterisation techniques, and potential technological utility has resulted in intense research activity in the field of polymer nano composites. Polymer composites made out of nano materia…
Porous alumina masks are fabricated by anodization of aluminum films grown on both semiconducting and insulating substrates. For these self-assembled alumina masks, pore diameters and periodicities within the ranges of 10–130 and 20–200nm, respectively, can be controlled by varying anodization conditions. 20nm periodi…
Ordinary fired Bi4Ti3O12 ceramics show a gradual reduction in their room temperature d33 after annealing at temperatures from room temperature to 450°C. Textured ceramics show a greater resistance to thermal depoling. At about 450°C there is a rapid drop of d33 for the textured materials, which may be a consequence of…
This paper discusses the potential for hydrogen storage in carbon nanostructures through a better understanding at the fundamental molecular level. The use of hydrogen as a fuel is limited in large part because of lack of progress in developing suitable storage and delivery systems. Materials that adsorb significant q…
We consider the electronic properties of empty single-wall nanotubes (SWNT) and SWNT filled with fullerene molecules (carbon “nano-peapods”). The first part of the review (Sec. II) is devoted mostly to the Luttinger liqued properties of individual metallic SWNT coupled to metallic electrodes or to superconducting lead…
New beta‐metastable Ti alloys containing Ta, Mo and Fe biocompatible elements were synthesized by arc melting and then quenched in water from the beta phase field. For each alloy, the beta‐metastable phase decomposition was characterized by electric resistivity measurements and differential scanning calorimetry upon h…
Electron emission and concomitant charge accumulation near the surface of insulators is central to understanding spacecraft charging. A study of changes in electron emission yields as a result of internal charge buildup due to electron dose is presented. Evolution of total, backscattered, and secondary yield results o…
Abstract The present paper reports on the cyclic stress–strain response of body-centered cubic ultrafine-grained (UFG) interstitial-free (IF) steel severely plastically deformed at room temperature utilizing equal channel angular extrusion (ECAE). Low-cycle fatigue tests were conducted with various strain amplitudes a…