Materials Literature
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導波路型偏光子は,光集積回路における基本的な素 子の一つである [1].TE透過型偏光子には,TM波の 漏れモードを利用するもの [2], [3]や,金属膜に励起さ れる表面プラズモンポラリトン (SPP) を利用するも のなどがある.SPP を利用する偏光子は,TM 波の スーパモードの干渉を利用することによって,短い偏 光子長で高い消光比が得られる.これまで,様々な金 属装荷導波路型偏光子が理論的に検討されてきた [4]~ [6].文献 [5], [6] では,導波路の片側に金属を装荷し, 金属とコアの間隔を変化させた場合の消光比の評価が 行われた.文献 [4] では,この種の偏光子をモデル化 する構造として,誘電体導波路の両…
A stable alumina-silica sol had been prepared by using aluminum sec-butoxide as the source of aluminum and partially hydrolyzed tetraethyl orthosilicate as the source of silicon.FTIR,XRD,SEM,TG and DTA were used to characterize the sol and examine the crystallographic and microstructure evolution of the dry-spun gel f…
The complex method of plane elasticity in two-dimensional decagonal quasicrystal is proposed and established.First the displacement potential function in the quasicrystal is represented by four analytic functions.Then by using the properties of analytic function and through a great deal of derivation,the complex repre…
Core-shell nano-composite material of conducting polyaniline(PANI) coating Fe3O4(magnetic oxide) was synthesized by emulsion polymerization with sulfosalicylic acid(SSA) as emulsifying agent and dopant, and ammonium persulfate(APS) as oxidant. Nano-Fe3O4 and the composite material were characterized by XRD, SEM, FT-IR…
Citric acid(CA) was used to modify graphitic activated carbon(AC) to improve the ruthenium distribution and the catalytic activity of Ru/AC catalyst.The influence of CA on the texture of AC and Ru/AC,Ru dispersion and catalytic activity were investigated.Transmission electron microscopy(TEM),thermogravimetric analysis…
Ethylene-propylene-diene monomer(EPDM) composite crosslinked with titanium dioxide modified with γ-methacryloxypropyl trimethoxysilane(MPS) was prepared through solution-precipitation method.SEM and swelling,solution results indicated that EPDM was remarkably crosslinked with titanium dioxide.And this crosslinking str…
A hierarchical roughness was fabricated on H62 brass surface by chemical etching with a FeCl3-HCl-H2O solution. The roughness consisted of terrace-like sidestep and etch pit with average pore diameter varied from 6.2 μm to 8.3 μm. The brass surface exhibited hydrophobic properties,with a water contact angle of about 1…
After the heat treatment of 840 ℃×1 h+480 ℃×4 h,mechanical tests show that the properties of Co-free maraging(T250) steel are not closely related to grain size.However,XRD analysis and corresponding microstructure observations reveal that the aging process is influenced by grain size obviously.Compared with coarse-gra…
BaBi_4Ti_4O_ 15 (short for BBT) ceramics were prepared by solid-state reaction technology. The effects of different excess Bi and Nb~ 5+ doping on the ceramics were investigated respectively, mainly including its phase compositions, microstructures, piezoelectric constant d_ 33 , relative dielectric constant e_r and d…
The properties of metallocene linear low density polyethene(mLLDPE) and linear low density polyethylene(LLDPE) films were analyzed with infrared spectroscopy and differential scanning calorimetry after irradiating under ultraviolet ray.for different times.The variation in carbony index and unsatursted carbon-carbon bo…
Phytic acid is a kind of industrial chemicals extracted from plants,but its application in certain domain is still limited.In order to explore the corrosion behavior of magnesium alloys and inhibitive effects of phytic acid in sodium chloride solution,weight-loss method and surface analysis techniques were used to stu…
Failure analysis of two chemical equipments made of titanium alloy were conducted by means of macroscopic and microscopic analysis,chemical composition analysis as well as microstructure analysis.The results showed that both of the two chemical equipments made of titanium failed because of hydrogen corrosion.The titan…
Ce~(3+) doped high Gd2O3 concentrations oxide glasses are prepared by high-temperature melting method and Gd2O3 content up to 40mol%,and their density,transmission,emission,excitation spectra with different concentration of Ce3+ and Gd2O3 and scintillating properties are measured,and the influence of concentration of…
Crack width is a most significant parameter for the durability assessment and design of reinforced concrete structures.Based on the accelerated steel bar corrosion test,in-depth study is carried out on interrelationship between the crack width,the extent of corrosion and the thickness of the cover,etc.The validity of…
The development of corrosion inhibitors is reviewed in this paper.Some advances of the technological application and theory study are commented.The developing tendencies of corrosion inhibitors are discussed.The information related to(a) application technology of corrosion inhibitors,(b) theory study about the mechani…
The modified PVA coating process was studied by the crosslinking reaction of the active amino resin and PVA.The results showed that using active amino resin which has non-toxic side effects on human to modify PVA not only retains the PVA oxygen resistance performance,but also increases the water-resistance and improve…
The magnetic and transport properties of the rare-earth cobalt oxides RCoO3 are strongly dependent on the rare earth ion and their detailed structure.The function of rare earth ion in the two structures were studied through Raman diffraction spectra. The results show RCoO3 compounds present the Pm3m cubic structure fo…
[Objective] The experiment aimed to clone paramyosin(PM) and mini-paramyosin(mPM) genes to analyze the relations between them and moving behaviors.[Method] PCR method and RACE technology were used to obtain whole cDNA of PM and some cDNA of mPM of Bombyx mori.By compared wgs of Bombyx mori,the genomic sequences of PM…
Based on physical test and numerical simulation,the shielding directivity of balance winding in large current transformer is analyzed.
We report detailed ab initio calculations of the optical properties of hexagonal BC_2N compound using the pseudopotential density function method,including the dielectric function,the refractive index,the absorption,the electron energy-loss spectrum,and the reflectivity.Our calculated results show that optical propert…