Materials Literature
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The Split Hopkinson pressure bar (SHPB) method has been used for impact tests such as compression and shearing, and is currently modified for tensile test, since the various kinds of high strength sheet metals are greatly concerned with the safety and the energy saving demands for high velocity vehicles. Evaluation of…
Aircraft jet engine should be designed to keep the required performance against for the event of foreign object ingestion, such as bird-strike. For the purpose to realize highly efficient and more advanced design of fan blade of jet engine, a numerical simulation technique for bird-strike problem has developed. Good a…
Computer simulation of battery performance, especially from first principles, can provide valuable information for understanding how a battery performs under dynamic conditions. This paper describes recent progress made in incorporating both oxygen and hydrogen recombinant cycles in a computational fluid dynamics base…
Polymer-Dispersed Cholesteric Liquid Crystals(PDCLC)have been obtained using different cholesteric liquid crystals mixtures by the Photopolymerization-Induced Phase Separation method. PDCLC samples of different thickness and different LC concentrations have been studied. The selective reflection spectra for different…
Palladium nanoparticles encapsulated into graphite (Pd–graphite intercalation compound: Pd–GIC) were produced from two kinds of graphite, natural graphite (average flake size: 270 μm) and kish graphite (average flake size: 15 mm). Hydrogen storage properties of Pd–GIC have been investigated by means of differential sc…
In order to investigate the criterion for the persistent slip band (PSB) formation near a Σ3(111) coherent twin boundary, where is a preferential site for formation of PSB, a high-cycle fatigue test is carried out at room temperature using a copper bicrystal specimen with the twin boundary. PSBs are observed near the…
Annihilation processes of radiation defects induced in solid-tritium breeding materials by neutron irradiation were studied by ESR measurement. The ESR spectrum for neutron-irradiated Li 2 TiO 3 is asymmetric, hence it is consists of several signals. This means that there are some para-magnetic radiation defects. The…
Pore development during exfoliation of natural graphite was studied using residue compounds with sulfuric acid. Pore structure of exfoliated graphite was characterized with an aid of image analysis technique, as functions of exfoliation conditions, temperature, residence time and intercalate content. Pore development…
The dynamic shear deformation and fracture characteristics of PC/ABS blend and ABS copolymer with regard to the relation between mechanical properties and strain rate, are studied experimentally using a torsional split Hopkinson bar at room temperature under strain rates ranging from 8 × 102 s-1 to 3.4 × 103 s-1. Frac…
In this work are described the syntheses of p-sexiphenyl and p-octiphenyl starting from 4-bromo-p-terphenyl and 4-bromo-p-quaterphenyl, respectively, by using a nickel complex in the presence of bipyridine with DMF as solvent. This type of synthesis was shown to give an improved yield as well as easy preparation and p…
Nonlinear dielectric spectroscopy in frequency domain has been applied to antiferroelectric liquid crystals in various smectic phases including antiferroelectric SmC A *, SmC FI2 * and incommensurate SmCα* phases. We have observed different characteristic third-order nonlinear dielectric spectra ϵη3* in respective pha…
We investigated second-order nonlinear optical properties of non-centrosymmetric crystals built of oblate, trigonal molecules: triphenylamine and adducts(complexes)of arsenic triiodide with sulfur, AsI3 · 3S8, and antimony triiodide with sulfur, SbI3 · 3S8. The efficiency of powder second-harmonic generation(SHG)in tr…
SiC-SiC ceramic matrix composites (CMCs) manufactured by the melt-infiltration (MI) process are leading candidates for many hot-section turbine engine components. A collaborative program between Goodrich Corporation and NASA-Glenn Research Center is aimed at determining and optimizing woven SiC/SiC CMC performance and…
The photochemical isomerization of pyrazoles was studied using ab initio methods. The singlet excited singlet state can evolve to give the Dewar isomer and the corresponding triplet state. The latter shows a lower energy and probably can be obtained with higher efficiency. The triplet state can evolve to give the corr…
In this work, a novel procedure for manufacturing an electret was designed, and the relationship between the surface voltage and other variables elucidated. The charge decay of the nonwoven electret over six weeks was also investigated. The new process quickly charges the dielectric to a voltage of between 10 and 30 k…
Seeded growths of faujasite and zeolite A were investigated by atomic force microscopy (AFM). For seeded growth, clear aluminosilicate solutions (90Na2O:xAl2O3:9SiO2:5760H2O, where x = 0.1–1.0), which are useful for faujasite or zeolite A growth on seeded faujasite or zeolite A, respectively, were prepared at 353 K. C…
Crystalline As2S3 (orpiment) is a layered-structure semiconductor whose optical properties, under ambient conditions, are determined by its diperiodic layer symmetry. We have investigated the effec...
New conjugated aryl-substituted poly(azomethine)s, termed poly(ketanil)s, have been synthesised from 1,4-phenylenediamine (or 3,3′,5,5′-tetramethylbenzidine) and two different diketones via polycondensation with the goal to obtain new materials with tunable spectroscopic properties. It is demonstrated that both the ab…
Tellurite glasses containing CuO with the nominal composition (CuO) x (TeO 2 ) 1− x , where x = 0.1, 0.2, 0.3, 0.4 and 0.5, have been prepared and investigated by x-ray photoelectron spectroscopy (XPS). The core level binding energies of Cu 2p, Te 3d, and O 1s in these glasses have been measured. The appearance of a s…
I am part of all that I have met; Yet all experience is an arch wherethro’ Gleams the untravell’d world, whose margin fades For ever and for ever when I move. How dull it is to pause, to make an end, To rust unburnish’d, not to shine in use! As tho ’ to breath were life. Life piled on life Were all too little and of o…