Materials Literature
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This paper presents and compares four optimization strategies for printed reflectarrays. They are applied to synthesize a dual-polarized reflectarray using two kinds of slot-loaded patches. They provide objective criteria to deal with the numerous geometrical parameters available to tune the phase. The study relies on…
The porous composite, which consists of the titania nanoparticles of anatase phase and silicate glass, was prepared by use of simple molding and sintering processes. Au nanoparticles were photocatalytically deposited inside the porous composite. In the diffuse reflection spectra of the porous composite loading Au nano…
A composite based on PLLA -HA was prepared by the solvent casting technique and characterized. An interaction between the polymer matrix and HA through the carbonyl and phosphate groups was obtained by FTIR . The several thermal transitions of PLLA were evaluated by DSC: the glass transition, crystallization, cold cry…
In this paper we propose an optimal design of ultra-wideband (4 ~ 20 GHz) microwave absorbers consisting of two resistive meta-surface layers of different square patch arrays. Gradient Descent and Genetic Algorithm numerical methods are employed to optimize all the parameters through equivalent transmission line circu…
In the present paper, tribological properties of DLC films deposited by UBM sputtering were investigated by rolling contact friction tests under approximately 2.86GPa of high contact pressure. DLC films were deposited by UBM sputtering under substrate bias voltages such as 0 to -300V. Friction coefficients of DLC film…
Bamboo shaped multiwalled carbon nanotubes (MWCNTs) were grown using iron (Fe) catalyst over aluminum (Al) film by microwave plasma enhanced chemical vapour deposition. The effect of nitrogen plasma in the modification of the microstructure has been investigated. Field emission from pristine MWCNTs and bamboo shaped M…
InGaN/GaN multiple-quantum-wells (MQWs) with three thinner barriers near the n-GaN layers were grown on c-plane sapphire substrates using metallorganic vapor phase deposition. For LEDs with an asymmetric barrier layer (ABL), high-resolution transmission electron microscopy analysis shows crystalline structure and inte…
コンクリート構造物の耐久性能評価において、空隙中での液状水挙動を把握することは、水分が要因となる劣化進行を精密に予測する上で重要である。本研究では、コンクリートの化学的性質を表す指標として見かけの接触角に、物理的性質としてしきい細孔径に着目し、化学的性質と物理的性質の両方の観点から、配合や養生がコンクリート中の液状水挙動に与える影響を検討した。その結果、混和材の有無による化学的性質の差異が毛管張力に与える影響はわずかであり、圧力勾配を駆動力とする流速を伴った液状水挙動において、空隙構造という物理的性質が支配的である可能性を示した。
For the magnetic flux pinning in YBa2Cu3Oy (YBCO) thin films, artificial pinning centers (APC) like BaZrO3 and BaSnO3 nanorods act effectively when magnetic fields are applied parallel to the c-axis of the YBCO thin films. However, it is necessary that APC exist into a three dimentional shape and random distribution i…
Continuous boron nitride nanofibers (BNNFs) have been gotten by electrospinning. The appropriate precursor of BNNFs was electrospinned to green born nitride nanofibers (GBNNFs) with temperatures from 80°C to 100°C in the protection of N2. By successive heat treatments in N2, the organics in GBNNFs disappeared and BN c…
The small punch (SP) creep test has been proposed as a semi destructive testing methodology to examine the residual creep life of high temperature components. A series of SP creep tests were conducted on low alloy steel at 600°C both in air and in high vacuum to investigate the influences of both testing environment a…
The dielectric response of canonical relaxor PMN single crystal oriented in [111] direction was investigated under the influence of various dc bias electric fields. The behavior of the Vogel-Fulcher temperature obtained from the characteristic relaxation times determined from the peaks of the imaginary component ϵ″(T)…
Hydrogen peroxosolvated compounds containing up to 16% H 2 O 2 have been synthesized by reacting the calcium cyclopolyphosphates NaCaP 3 O 9 · 2H 2 O, Ca 2 P 4 O 12 · 4H 2 O, and Ca 3 P 6 O 18 · 9H 2 O with hydrogen peroxide vapor or with a 70–96% hydrogen peroxide solution. In these reactions, hydrogen peroxide serve…
The aminolysis of polyethylene terephthalate (PET) fibers with diamine, such as ethylenediamine, is one of the important methods to introduce free amino groups on their surface chemically. The aminolyzed PET fibers can easily interact with various dyestuffs or functional materials, similar to conventional fibers havin…
A solid-phase mechanochemical technology of production of polycrystalline InSе intercalated with Ni up to 1.25 at. % has been developed. The x-ray and phase analyses of the produced NixInSe samples confirm their homogeneity and demonstrate a nonmonotonic Ni-content dependence of the lattice constant along the axis nor…
An advanced procedure for the one-pot synthesis of organic–inorganic hybrid materials via combination of sol–gel process and nucleophilic aromatic substitution reaction (SNAr) of 4-fluoronitrobenzene and 3-aminopropyltrimethoxysilane is described. With this advanced procedure both SNAr-reaction and sol–gel process can…
In this paper, we obtained three kinds of composite materials which were composed of metal oxides (ZnO, SnO2 and TiO2) and CNTs through catalytic pyrolysis method. Then we carried out the surface morphology, field emission and gas sensitivity properties test for them, and summarized the composite ways of metal oxides/…
Three-dimensional networks-on-chip (NoC) is proposed to achieve better communication performance, higher device density and lower power consumption. However, thermal issues resulted by stacked high power density architecture are significant challenges for design of 3D NoC architectural systems. In this paper, we explo…
A waterborne polyurethane (WPU) dispersoid was synthesized through the prepolymer method using aliphatic isocyanates [namely isophorone diisocyanate(IPDI), hexamethylene diisocyanate(HDI)] and self-made polyester polyol as main raw materials. The effects of HDI/IPDI ratio on properties of waterborne polyurethane were…
Liquid sodium is used as coolant in fast reactors (FRs), because of its high thermal conductivity and wide temperature range of liquid phase. It has superior thermal medium properties but its chemical reactivity with water and oxygen is very high. Hence, FR plants have to take safety measures regarding these reactions…