Materials Literature
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Using density-functional theory with ultrasoft pseudopotentials, we previously investigated the structural and electronic properties of the low-pressure (cubic, tetragonal, and monoclinic) phases of ZrO2 and HfO2, in order to elucidate phonon modes, Born effective charge tensors, and especially the lattice dielectric…
Under mechanical deformation, most materials exhibit both elastic and fluid (or plastic) responses. No existing formalism derived from microscopic principles encompasses both their fluid-like and solid-like aspects. We define the {\it statistical texture tensor} to quantify the intuitive notion of stored deformation.…
Abstract Electrospinning gives rise to polymer nanofibers. The spinning process is characterized by strong deformations of the polymer material taking place during the spinning process and a very rapid structure formation process happening within milliseconds. We were interested in the influence of the peculiar spinni…
We exploited the exceptional thermal stability and diverse molecular shapes of higher diamondoids (C22 and higher polymantanes) to isolate them from petroleum. Molecules containing 4 to 11 diamond-crystal cages were isolated and crystallized, and we obtained single-crystal x-ray structures for representatives from thr…
Production processes for carbon nanotubes often produce mixtures of solid morphologies that are mechanically entangled or that self‐associate into aggregates. Entangled or aggregated nanoparticles often need to be dispersed into fluid suspensions in order to develop materials that have unique mechanical characteristic…
Alternated a-C/a-C : Cr (about 2.5μm thickness) coatings were made by DC magnetron sputtering from graphite and Cr target in an argon discharge. Mechanical and tribological properties were measured by indentation, scratch and pin-on-disc test. The critical scratch load of a-C/a-C : Cr multilayer coatings for total fai…
A 10-year outdoor exposure test has been carried out to investigate atmospheric corrosion behavior of hot-dip aluminized SUH409L steel sheets in an industrial and a marine environments. Corrosion current density distribution at scribed coating area was measured by scanning vibrating electrode technique (SVET) to study…
SUMMARYThe properties of anodic films produced by anodising aluminium in aqueous solutions of organic acids at room temperature at commercially interesting current densities were investigated with particular emphasis on the wear index, micro hardness, surface roughness and pore structure. Voltage time curves obtained…
Het laboratorium- en literatuuronderzoek in dit proefschrift betreft de mogelijke effecten van reacties van de organische matrix van dentine op cariës.
Test pieces of a tetragonal zirconia polycrystal containing 3mol% yttria were deformed in tension under superplastic conditions in air to pre-determined nominal strains ranging from 0.0 to 200%. The X-ray diffraction experiments were conducted on surface regions of gauge sections of the deformed test pieces to investi…
This paper describes some of the processing issues for extruding salicylic acid-based polymer prodrugs into fibers for medical devices. Polymeric prodrugs, in which a drug is polymerized in a degradable polymer that delivers controlled quantity of the drug to a targeted site in the body as the device degrades, are a n…
Luminescent polymer electrolyte composites composed of silica coated Y 2 O 3 :Eu in polyethylene glycol (PEG) matrix has been produced by initially synthesizing silica coated Y 2 O 3 :Eu and mixing with polyethylene glycol in a lithium salt solution. High luminescence intensity at round 600 nm contributed by electron…
Dispersive features observed in graphite, carbon nanotube bundles and isolated single‐wall carbon nanotubes are discussed. Special attention is given to the effects of the van Hove singularities in 1D nanotubes.
A novel tubular solid oxide fuel cell configuration with high volumetric power packing density is discussed. With good thermal shock resistance, high mechanical strength, easy sealing, and high volume manufacturing ability, tubular SOFC designs offer many advantages over planar designs. One shortcoming is the lower vo…
Tensile deformation was carried out for a mechanically milled Al–1.1 mol%Mg–1.2 mol%Cu alloy at temperatures of 523–823 K and a true strain rate of 1×100 s−1. The largest uniform elongation prior to local necking occurred at an intermediate temperature (748 K). This temperature dependence of the uniform elongation was…
In the present paper, the crystalline orientation in melt spun (Nd,Dy)-(Fe,Co)-B ribbons was investigated. The average ribbon thicknesses for Nd15Fe77B8, Nd15Fe75Co2B8 and Nd14DyFe75Co2B8 at V=1 m/s are 300, 380 and 420 μm, respectively. The thickness of (Nd,Dy)-(Fe,Co)-B ribbons decreases with increasing roller speed…
Two key technologies were reviewed to propose effective approaches to functional glasses. One is combinatorial glass synthesis system. The combinatorial glass synthesis system consists of automatic batch preparation apparatus and two types of automatic apparatuses for melting of glass batches in crucibles. The combina…
The phase transformations from the ε- to τ-phases for alloys with the composition of Mn53.6–Al46.4 doped with carbon were investigated using SEM with EDS, optical microscopy and XRD, where the ferromagnetic τ-phase was clearly visualized by suspending a ferromagnetic colloid fluid. When the quenched specimen of the ε-…
In order to clarify the mechanisms of partial discharge (PD) and tree degradation, PD characteristics of an artificially-simulated tree channel in low-density polyethylene (LDPE) were investigated. During the application of AC voltage, new tree channels were formed at the tip of the artificial channel. PD characterist…
恵庭aテフラ(En-a,17ka BP)の火山ガラス屈折率は,試料採取地点によって異なることがある.その原因は,En-aはフォールユニットごとに火山ガラス屈折率が異なるからである.石狩低地帯南部では,En-aに少なくとも3つのフォールユニットが認められる.火山ガラス屈折率は,上位フォールユニットで高い値(n=1.510-1.514),中～下位フォールユニットで低い値(n=1.505-1.510)を示す.また,単一のフォールユニット内であっても,火山ガラス屈折率は層準によって若干異なる.なお,斜方輝石屈折率については,最下位層準でやや高い値(γ=1.713-1.716)を示すほかは,全層準を通じてほぼ一定の値(γ=1.710-1.7…