An Eu2+-activated AlN phosphor was synthesized by firing the powder mixture of AlN, α-Si3N4, and Eu2O3 at 2050°C for 4h under 1.0MPa N2. This nitride emits a strong blue color with chromaticity coordinates x=0.139 y=0.106 an accelerating voltage 3kV. The cathodoluminescence properties AlN:Eu2+ evaluated utilizing it in Spindt-type field emission display panel. It shows that exhibits higher brightness, purity, lower saturation, longer lifetime than currently used Y2SiO5:Ce3+, indicative...

An Eu2+-activated AlN phosphor was synthesized by firing the powder mixture of AlN, α-Si3N4, and Eu2O3 at 1500−2050 °C for 4 h under 1.0 MPa N2. The phase purity, photoluminescent properties, thermal quenching, quantum efficiency fired samples were investigated. A single wurtzite formed low doping concentrations Eu2+ (≤0.1 mol %) Si (≤2.2 %). introduction is essential solubility in lattice. Intense blue luminescence with a peak emission wavelength 465 nm observed AlN:Eu2+, when doped...

Abstract The crystal structure of nylon 12 prepared by polymerization dodecalactam has been determined x‐ray diffraction. Nylon fiber exhibits only the γ form as its stable structure. unit cell was with aid diffraction pattern a doubly oriented specimen. is monoclinic = 9.38 Å, b 32.2 Å (fiber axis), c 4.87 and β 121.5° contains four repeating monomer units. chain planar zigzag for most part but twisted at position amide groups, forming hydrogen bonds between neighboring parallel chains....

Abstract This paper presents a generic frame (GF) model useful for the simulation of earthquake responses steel moment frames. Adopting assumption that all rotations at joints lying each floor level are identical, requires solution significantly fewer degrees freedom than models with member‐by‐member representation. Procedures to construct GF represents multi‐storey, multi‐span detailed. The can allow panel zone behaviour as well. accuracy in predicting maximum storey drifts and member...

This paper addresses the design and behavior of a composite brace system comprised unbonded steel flat-bar embedded in precast reinforced concrete panel. Debonding material is painted onto to remove bond stress between panel, so that axial load applied only on brace. The panel stiffening member designed prevent from buckling order effectively mobilize compressive together with tensile during seismic loading. requirements restrain are derived equilibrium considerations, verified by tests. Two...

The present study focuses on the effects of Ag addition critical current density ( J c ) and mechanical performance disk‐shaped MgB 2 bulk superconductors. samples with varying contents 0, 2, 4, 6, 8, 10 wt% were sintered at 775 °C for 3 h in Ar atmosphere. values improved addition, that sample 4 showed highest value 295 kA cm −2 20 K self‐field. respective same 430, 360, 238 self‐field, 0.5 T, 1 T 7 K. These are so far reported materials. Scanning electron microscopy silver oxide particles...

The luminescence properties of Si,Eu‐codoped AlN phosphors were investigated by means cathodoluminescence. concentration Eu was kept constant, while that Si varied from 0 to 9.0 at.% using two different Si‐source starting powders, 3 N 4 and SiC. 2+ in is only observed for samples doped with Si. On the other hand, a quenching high amount not those These results show importance ‐doped AlN.

We propose a novel concept of thin and compact CPV modules in which submillimeter solar cells are directly attached to lens arrays without secondary optics or an extra heat sink. With this small cell size, the optical path length module can be brought down one-twentieth that conventional modules. To achieve precise alignment microsolar at focal points, we have developed fluidic self-assembly technique utilizes surface tension. This with triple junction demonstrated efficiency 34.7% under...

It is found that a rapid cooling structure effective to improve overwrite characteristics of phase change type optical disk media. For structure, thin A1N dielectric layer, 30 nm, with high thermal conductivity suitable. The layer adopted between the active and reflective metal in quadrilayer structure. rate calculated be 12°C/nsec. This shows clear amorphous marks. A using GeTe–Sb 2 Te 3 –Sb ,alloy 20 nm has produced two million cycle stable bit error characteristics. 1) And erasability...

A variable valving system was developed. This has two cam profiles, one for low speed and high speed. 1.2-litre DOHC experimental engine using this made mounted in the body of a 2-litre class passenger car. Test results car were compared to those same with its original engine. The test showed better every area driving performance, mode-fuel-economy noise tests. paper presents mechanism, operation system,

This paper presents an innovative structural system, named weld-free developed to overcome the difficulty in quality assurance encountered construction of steel moment resisting frames with conventional welded connections. The proposed system adopts a mechanical joint equipped metallic-yielding damper as beam-to-column connection, wherein slip-critical joints are made by recently super high-strength bolts. configuration and load-carrying mechanism structures described herein. Key features...

GeTe-Sb2Te3-Sb pseudo ternary components alloy shows laser induced rapid crystallization and amorphous change phenomena. Films of non stoichiometric can be crystallized using pulses less than 100ns duration. The crystalline structure the cubic structure. time it takes to crystallize varies Sb concentration. And increasing concentration leads increased temperature. temperature 180 C more 1200h stable acceleration test 80C 80% RH environment. Thin film disk 20nm active layer produce million...

Abstract Dimensional changes in nylon 6 film on absorption and desorption of water were studied as functions time the amount absorbed water. For absorption, a plot expansion versus square root was sigmoidal initial region did not coincide with sorption curve: latter linear same region. This behavior is very similar to that reported for fiber by Kunzman. A theoretical analysis based certain assumptions about molecular state gave good agreement experimental results. By this it shown...

This paper deals with steel moment frames combined hysteretic dampers. Specifically, it examines the strength of dampers required to minimize damage under earthquake loading. The important structural variables are ratio dampers' shear maximum resistance, termed β in this study, and relative stiffness between damper main frame, k. equivalent viscous damping entire system is affected by quantities k ductility frame. optimum (βopt), which maximizes ratio, was formulated as a function k, found...

This paper reports on high-power and high-temperature operation of an AlGaInP-based red laser diode with magnesium (Mg)-doped quaternary-alloy cladding layer. The use Mg dopant small diffusion coefficient enables abrupt doping profiles as well high carrier concentrations when compared to conventional zinc (Zn) dopant. It was also found that the metal-organic vapor phase epitaxial (MOVPE) growth Mg-doped quaternary AlGaInP alloy is not affected by so-called reactor memory effects, while...

Assessment of the quality care is a key element in current diabetes care. However, for patients Japan has rarely been reported.To assess two communities by using National Health Insurance claims data.We analysed claim data 13,650 beneficiaries from May 2006 to April 2007. Diabetes cases were identified case detection algorism. Our main outcome measures three process indicators: (1) haemoglobin A1c (HbA1c) testing; (2) annual eye examination; and (3) nephropathy screening, recommended...

Buckling-restrained braces, which satisfy criteria of preventing flexural buckling restraining members, can form out-of-plane mode if stiffness their connections and girder are small. In order to prevent buckling, load must be larger than the maximum axial force brace. This paper addresses that required both buckling. Based on observation loading tests, buckling-restrained braces formed as became less stiffness. As a result, is useful for

In this paper, we adapted the top-seeded infiltration growth 'IG' technique and produced several YBa2Cu3Oy 'Y-123' samples with an addition of Y2BaCuO5 'Y-211' secondary phase particles varying sizes by sintering process ball milling technique. For first set samples, Y-211 disks were sintered at temperatures ranging between 900 °C 1100 used for production Y-123 material IG process. Magnetization measurements showed a sharp superconducting transition onset Tc around 92 K, irrespective...

We have developed a compact concentrator photovoltaic (CPV) module that comprises micro-solar cells with an area of ≈0.6 × 0.6 mm 2 sandwiched between 20-mm-thick lens array and 1-mm-thick circuit board no air gap. To establish electrical connections the cells, we cell positive negative electrodes on lower face cell. In this study, demonstrated performance closely approaches standard solar measuring ≈5 5 commonly used in conventional CPVs under concentrated illumination. Our study showed...

A thin disk substrate was examined for use as a high-density recording optical disk. An injection-molded polycarbonate of 0.6 mm thickness showed birefringence under 60 nm and small tilt angle 5 mrad. The track pitch 1.0 µm the diameter 86 mm. laser source visible light at wavelength 680 nm, numerical aperture ( NA ) head large 0.6. This new drive system had characteristics wide tolerance, equivalent to conventional thick substrates 1.2 mm, mark length 0.52 µm, giving carrier-to-noise C / N...

MgB2 superconductors can be synthesized through a new route by using Mg2Cu instead of pure Mg. When the heating temperature was raised to around melting point (568 °C) Mg2Cu, Tc PIT-processed /B Fe-sheathed wires rapidly increased and reached about 37.5 K. with its low point, promoted diffusion reaction form high at temperatures. Many second phases large size (several tens micrometres) were formed small amount in core wires. However, transport Jc showed rather value, which over 105 A cm−2...