Materials Literature
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Objective: Bleaching agents may not be safe for dental materials. The purpose of this invitro study was to evaluate the effects of Opalescent Quick "in-office bleaching gel" containing 35% carbamide peroxide on the surface roughness and hardness of microfilled(Heliomolar) and hybride (Spectrum TPH) composite resins.Ma…
ダイヤモンドは超高圧安定相であることから大型結晶の合成が困難であり、応用は工具など硬度を利用した用途に限られていたが、大きさとコストの課題をクリアできれば、その用途は計り知れない。特に究極の半導体と称され、半導体開発ロードマップ上では、炭化ケイ素SiCや窒化ガリウムGaNの次に位置している。高温動作が可能であり、物質中最高の熱伝導率が活かせるパワーデバイスが実現すれば、例えば、車載用インバータを冷却フリー化でき、低電力損失と冷却システムの軽量化の両面から省エネに貢献できる。本稿では、大型化が可能な気相合成による単結晶ダイヤモンド合成と難加工材であるダイヤモンドをウェハ形状にする技術開発について述べる。
Purpose: of this paper is to characterise the corrosion resistance in the steel sheets (Hot dip galvanizing of steel sheets) used in automotive industry. In fact, corrosion of automotive components by road salt is a widely known problem. The different parts under the car body and the interior surface of body panels su…
In order to develop high quality aluminum alloy products, modeling to predict a behavior of solute distribution in dendrite and precipitation within the inter-cell region quantitatively is important. However Scheil's and Brody-Flemings's equations can't find the precipitation behavior during solidification because a d…
18Cr18Mn2Mo0.77N 的微结构进化高氮在老化处理的奥氏体的不锈钢被光显微镜学(OM ) 调查，扫描电子显微镜学(SEM ) ，和传播电子显微镜学(TEM ) 。有有 a=0.892 nm 的 a=0.478 nm 和 c=0.444 nm 和以身体为中心的立方的金属间化合的阶段的六角形的 intergranular 和细胞的 Cr2N 在等温的老化处理逐渐地猛抛的结果表演。矩阵氮弄空由于 intergranular Cr2N 降水导致 Vickers 坚硬的腐烂，并且细胞的 Cr2N 和阶段的形成在价值引起增加。影响坚韧介绍 monotonic 减少和 SEM 形态学表演领先的易碎的 intergranular 破裂。…
We report on the investigation of magnetic field induced charge density waves and Hall coefficient sign reversal in a quasi-two-dimensional electronic system of highly oriented pyrolytic graphite under very strong magnetic field. The change of Hall sign coefficient from negative to positive occurs at low temperature a…
In this paper we investigate the dynamic properties of the minimal Bell–Lavis (BL) water model and their relation to the thermodynamic anomalies. The BL model is defined on a triangular lattice in which water molecules are represented by particles with three symmetric bonding arms interacting through van der Waals and…
In this review, we describe some of our recent approaches to the development of functional liquid-crystalline (LC) materials and fibrous aggregates. A variety of electro-active and photo-active π-conjugated molecules that exhibit nanostructured LC phases such as micellar cubic, columnar, and smectic structures have be…
PVC/ PMMA polymer blends are characterized at molecular level by FTIR-ATR spectroscopy providing important insight into the molecular interactions responsible for the enhancement of its mechanical properties. The changes in mechanical properties are reflected by the changes in the FTIR-ATR spectrum. The mechanical pro…
The nature and topological distribution of optical centers within various regions of hot pressed disks of transparent magnesium aluminates spinel ceramics doped with LiF were studied. In the optical absorption spectra of this type of ceramic, bands were revealed at 4.75 eV and 5.3 eV, which were identified with F + -a…
Abstract: The ethylene-vinyl alcohol copolymer(EVOH)/nano-SiO2 composites were prepared by melt blending with different processing technologies(melt blending technology and film-blowing technology) and blown to film. The structure of the EVOH/nano-SiO2 composites was analyzed through polarizing microscope (POM) and di…
Mesoporous titanium dioxide is extensively employed as photocatalysts for environmental remediation of pollutants, active charge transport carriers in dye sensitized solar cells and for photosplitting of water. Depending on the Depending on the ordering of the pores, they may be classified as periodic or aperiodic mat…
Silicon, silica and silicones are all related and each of them have important but separate technological roles to play for mankind in this millennium. All three have the element silicon (Si) in common but they have unique and distinctive chemistries, properties and applications. This overview describes some of the the…
In this paper, an analysis of degradation processes influence on the increase of polar products and charge carriers concentration, and the values and forms of absorption/resorption currents curves are presented. Based on their values, the polarization index and conductivity factor are determined and lifetime duration…
The crystal structure and photoluminescence of phosphors were investigated. A preliminary conclusion was reached through X-ray diffraction, Fourier transform infrared absorption, photoluminescent excitation and emission investigations that a polymorph was found. The characterizes an intense blue emission with a peak a…
Институт механики сплошных сред УрО РАН, Пермь, РоссияНа основе явной конечно-разностной схемы, модернизированной авторами ранее на случай нерегулярных треугольных сеток с локальной автоматической перестройкой, рассмотрено моделирование процесса трещинообразования материалов при действии продуктов детонации.Разработан…
High-purity, dense nano-laminated (Cr0.95Ti0.05)2AlC compounds were synthesized via a powder metallurgical route. Their oxidation characteristics were investigated by exposing them to temperatures between 900 and 1200 degrees C in air. The alloying Ti in the Cr layer of Cr2AlC did not significantly change the crystal…
分散媒体として水を用い，有機変性させることなくモンモリロナイト(MMT)をポリビニルアルコール(PVA)中に充てんした。得られたPVA/MMTナノ複合材料の構造を走査型電子顕微鏡;,X線回折により評価し，引張り試験により力学物性を検討した。その結果，複合材料中でMMTは層剥離し，ナノ次元で分散していることが明らかとなった。また,PVAフィルムと比較してナノ複合材料では，弾性率・強度が大きく増加した。X線回折法を用いて，外部応力を付加した際にMMT結晶(060)面に生じるひずみを測定したところ，複合材料全体に加えた応力の61倍がMMTに集中しており，これがナノコンポジッ卜の補強性の発現をもたらしていると考えられた。
We studied the properties of regioregular P3HT conducting polymers with three different molecular weights infiltrated into the pores of mesoporous titania thin films. The titania thin films, prepared by self-organization of titania species with a non-ionic triblock copolymer F127 followed by calcination to remove orga…
Novel poly (vinyl caprolactam-co-vinyl acetate) microspheres were crosslinked with N’, N’ methylene bisacrylamide (NNMBA) prepared by free radical emulsion polymerization. This was done by using vinyl caprolactam, vinyl acetate, and NNMBA with varying amounts. 5-Fluorouracil (5-FU) is an anticancer drug which was mixe…