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Article
A Study on the Effects of Specimen Geometry on Measurement Accuracy of Dynamic Constitutive Properties of Metals Using SHTB
Determination of dynamic tensile response of materials has been a challenge because of experimental difficulty. The split Hopkinson tensile bar (SHTB) is one of the most widely used devices for characterizatio...
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Article
Measurement of a Nearly Friction-Free Stress–Strain Curve of Silicone Rubber up to a Large Strain in Compression Testing
Nominal stress–strain curves of a silicone rubber specimen with a range of length-to-diameter (L/D) ratios have been measured via compression testing. The curves are highly dependent on the L/D ratio. The cont...
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Article
Non-catalytic direct synthesis of graphene on Si (111) wafers by using inductively-coupled plasma chemical vapor deposition
We employ inductively-coupled plasma chemical vapor deposition for non-catalytic growth of graphene on a Si (111) wafer or glass substrate, which is useful for practical device applications of graphene without...
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Article
Influence of annealing atmosphere on the electrical conductivity of copper nanoparticle films
The oxidation, organic decomposition, and grain growth of Cu nanoparticles were systematically investigated under various heat-treatment conditions to understand the correlation between the heat-treatment cond...
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Article
Understanding the anomalously long duration time of the transmitted pulse from a soft specimen in a kolsky bar experiment
The reason for the observation of an anomalously long pulse duration time of a signal transmitted from a soft specimen in a Kolsky bar experiment is investigated. A systematic numerical experiment based on exp...
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Article
Crystal phases, photoluminescence, and long-afterglow luminescence of SrAl2O4: Eu2+, Dy3+ - xB2O3 (0 ≤ x ≤ 0.4) phosphors
SrAl2O4: 0.04Eu2+, 0.08Dy3+ - xB2O3 (0 ≤ x ≤ 0.4) phosphors were synthesized by using the conventional solid-state reaction route. The long-afterglow (LAG) luminescence increased notably up to x = 0.3, followed b...
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Article
Effect of the cross-sectional shape of the recirculation channel on expulsion of air bubbles from FDBs used in HDD spindle motors
This paper experimentally and numerically investigated the behavior of air bubbles in the oil lubricant of operating fluid dynamic bearings (FDBs) with a cross-sectional recirculation channel (RC). Experiments...
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Article
Correction functions to determine the stress state of a flattened disk specimen in diametral testing with reference to analytical solutions for circular specimens
The correction functions that can be used to determine the stress state of a flattened disk specimen in diametral testing are provided by referring to the analytical solutions for arc- and point-loaded circula...
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Article
Behavior of a micron-sized air bubble in operating FDBs using the discrete phase modeling method
This paper investigates the motion of a micron-sized air bubble in the operating fluid dynamic bearings (FDBs) of a spindle motor in a computer hard disk drive. The flow field of FDBs is calculated by solving ...
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Article
pH-dependent absorbance of a centrifuged rhodamine B-TiO2 suspension, and a practical filtration method with minimized dye loss in a dye decoloration test
Although the centrifugation of a rhodamine B (RhB)-TiO2 suspension cannot separate TiO2 particles completely, the UV/Vis absorbance of the residual TiO2 in the centrifuged suspension, under neutral and basic cond...
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Article
Microstructural evolution of metatitanic acid with temperature and its photosensitization property
Metatitanic acid (MTA) powder was heat-treated up to 800 °C in air, and the resultant evolutions of crystalline phase, specific surface area, and pore size were investigated. MTA loses its weight in two steps;...
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Article
Performance of a flying cross bar to incapacitate a long-rod penetrator based on a finite element model
Performance of a flying cross bar, instead of the flying plate, to incapacitate the long-rod penetrator, has been evaluated numerically based on a finite element model. The length to diameter ratio, L/D, of the p...
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Article
Visible-light photocatalytic activity of carbothermally reduced/nitrided Ta2O5 to decompose rhodamine B in aqueous solution
Carbothermally reduced and nitrided Ta2O5 powder at varying temperature (680–760 °C) in flowing NH3 facilitated both nitrogen do** and the formation of the traces of TaON and Ta3N5 to a greater degree than the ...
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Article
Visible-light photocatalytic activity of NH3-heat-treated Ta2O5 to decompose rhodamine B in aqueous solution
Ta2O5 powder was heat treated in flowing NH3 at varying temperature for 2 h. When heat treated at 680–720 °C, nitrogen was doped to Ta2O5, but showed only a slight improvement of photocatalysis of rhodamine B dye...
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Article
Thermophysical Properties of Ceramic Filler-Added BaO–ZnO–B2O3–P2O5 Glass Composites for Barrier Ribs of Plasma Display Panels
The capability of BaO–ZnO–B2O3–P2O5 glass in hosting various ceramic fillers (up to 20 mass% of Al2O3, TiO2, and ZnO) has been investigated. All the investigated filler-added glasses have demonstrated a reasonabl...
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Article
Penetration direction of a crack terminating at a bi-material interface obliquely
Crack penetration direction at a bi-material planar interface has been investigated numerically as a function of primary crack obliquity. Crack penetration angle prefers to follow the normal direction to the i...
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Article
Deflection criterion of a crack approaching a bi-material interface obliquely
Deflection criterion for oblique cracks terminating at a bi-material interface was established numerically based on a remote loading condition where the crack deflection event took place well within the K-dominan...
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Article
Reduced electrical resistivity of reaction-sintered SiC by nitrogen do**
A post heat treatment of reaction-sintered SiC at 1700 °C in nitrogen atmosphere significantly reduced electrical resistivity. A trace of insulating Si3N4 phase was detected via nitrogen heat treatment in high-re...
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Article
Role of submicron residual fillers in improving optical reflectance of barrier rib glasses for plasma display panels
The improvement of optical reflectance of BaO–ZnO–B2O3–SiO2 (BZBS) glass by the addition of various types of micron-scale crystalline fillers (TiO2, SiO2, ZrO2, Al2O3, MgO, and cordierite) was investigated for ap...
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Article
Effect of SiO2 Addition to BaO-ZnO-B2O3 Glass on Dielectric and Thermal Properties for Application to Barrier Ribs of Plasma Display Panels
The effect of SiO2 addition to barium zinc borate (BaO-ZnO-B2O3, BZB) glass on dielectric and thermal expansion properties was investigated. When SiO2 was added to the glass batch to form a SiO2-BaO-ZnO-B2O3 (SBZ...
