Materials Literature
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Nanoparticles are a class of materials that have seen increasing use as friction and wear reducers in tribological applications. Amorphous carbon (a-C) films have been the subject of significant scientific and industrial interest for use as solid-state lubricants. Here, we present classical molecular dynamics simulati…
Abstract Thermal expansion of differently‐textured pyrolytic carbon matrices (pyrocarbons) of carbon/carbon composites was studied with a high temperature X‐ray diffraction at temperatures ranging from 25°C to 1400°C. The composites were synthesized by chemical vapor infiltration of a carbon fiber felt, using methane…
The single-crystal structure of fully dehydrated partially $Li^+$ -exchanged zeolite Y, ${\mid}Li_{50}Na_{25}{\mid}[Si_{117}Al_{75}O_{384}]$ -FAU, was determined by single-crystal synchrotron X-ray diffraction techniques in the cubic space group $Fd\bar{3}m$ at 100(1) K. Ion exchange was accomplished by flowing stream…
This paper presents a result of the mechanical noise and vibration analysis as well as the electrical characteristics analysis of the permanent magnet(PM) motor according to the driving method that is Brushless DC(BLDC) drive and Brushless AC(BLAC) drive. To do that, the characteristics of the PM motor, which have the…
以膨胀石墨和α-Al 2 O 3 微粉为原料, 采用高能球磨制备了纳米碳包覆的α-Al 2 O 3 复合粉体, 研究了高能球磨时间和球磨速率对复合粉体物相及形貌的影响。采用X射线衍射仪、场发射扫描电子显微镜和透射电子显微镜对复合粉体的物相、形貌和微观结构进行了表征。结果表明: 按膨胀石墨与α-Al 2 O 3 质量百分比为1:2, 球磨速率为600 r/min, 球磨5 h可得到被粒度为20~50 nm碳颗粒包覆的α-Al 2 O 3 复合粉体; 随着球磨时间延长, 石墨(002)晶面特征峰逐渐消失, 膨胀石墨中纳米片层会随球磨时间延长不断剥离脱落, 并逐渐龟裂成纳米碳颗粒; 相同球磨时间下, 提高球磨速率可以促进纳米碳颗粒形成,…
Two series of new green phosphorescent polymers bearing a bis(2-phenylpyridine)iridium(III)(dibenzoylmethane) [(ppy)2Irdbm] complex were designed and synthesized. Polycarbazole (PCbz) derivative or polyfluorene with pendant carbazole groups (PFCbz) were employed as host polymers for the iridium complex. The iridium co…
No presente estudo o empenamento de peças de polietileno linear de baixa densidade (PELBD) moldadas por rotomoldagem foi investigado. O efeito de diferentes fatores como espessura da peça, taxa de resfriamento e diâmetro de tubo de ventilação foi avaliado. Além dos experimentos de rotomoldagem, uma técnica alternativa…
isomers, DFT calculations, Cage volume changeHydrogen is a promising green energy source because ofits abundance in nature. Hydrogen storage materials (HSM)have thus received much attention from researchers. Themost remarkable theoretical reports of the HSM involvemetal atoms coated on carbon fullerenes and nanotubes.
Crystallization plays an important role in separation and purification of the antibiotics. And it is also an indispensable step in preparation of pharmaceuticals with biological activities and specific crystal form. As the last step in purification, crystallization determines the puri‐ ty, crystal habit, granularity a…
The green lasers are attractive and highly useful for lot of practical applications. It is more than fifty times brighter when compared to a red laser and thus it can be seen from miles away. Due to these features, the green lasers can be used in high-tech weapons for aiming purposes. More‐ over, the green lasers are…
The study on the diversity of benthic diatoms and water quality in the Mekong River as it passes through Ubon Ratchathani, Thailand was carried out from February 2007 to January 2008. Samples were collected from 10 stations, which were situated in areas involving different geographical features and human activities. T…
Transparent conducting aluminum-doped and undoped ZnO thin films have been deposited by direct current (DC) sputtering technique from ZnO target onto glass substrate at room temperature and 400 °C. X-ray diffraction analysis shows that all films have a preferential growth along the c-axis of the hexagonal structure. T…
Suprakolloidale Hybride: Polymerbasierte Janus-Micellen wurden entwickelt, die mehrwandige Kohlenstoff-Nanoröhren in verschiedenen Lösungsmitteln, einschließlich Wasser, stabilisieren. Entscheidend für die Stabilisierungseigenschaften ist das Größenverhältnis zwischen stabilisierendem und adsorbierendem Patch („Janus-…
(Bi,Pr)(Fe,Mn)O3 (BPFM) thin films were deposited on SiO2/Si substrates by a chemical solution deposition method, resulting in the metal–ferroelectric–insulator–semiconductor (MFIS) capacitor structure. Polycrystalline BPFM films were grown on the substrate without impurity phases. Comparing with the capacitance vs vo…
The embedded cluster method for ion–covalent crystal band structure calculations is proposed. This method uses the results of embedded cluster electronic structure calculations within one‐determinant Hartree–Fock approximations. The band structure of high‐temperature cubic phase ZrO2 crystal is calculated and found to…
Specific features of stratified flows are considered taking fast-neutron reactors as an example, the possibilities of scale-wise simulation of such flows are discussed, and some results obtained from experimental and numerical investigations of flows in mixing chambers and pipelines are presented. The mixing of sodium…
An improved power standard derived from a current comparator power bridge for calibrating active/reactive power and energy meters under sinusoidal conditions is described. Measurements can be made at any power factor from zero lag through unity to zero lead, at positive or negative power, at 120 V, 5 A, and 50 or 60 H…
In this research, Response Surface Methodology (RSM) was used to optimise the effect of three controllable input variables. To study the proposed second-order polynomial model for maximising Amorphous silica, a Central Composite Design (CCD) was used to estimation the model coefficients of the three input factors, whi…
In this work, a novel strategy is provided to prepare silver nanoplates by a fibronectin (Fn) nanofibril template. First, Fn molecules were controlled to assemble into amyloid-like nanofibrils in highly concentrated ethanol aqueous solution. The resultant nanofibrils could serve as a soft template to direct the format…
We report on a novel TaO x -based nonpolar resistive random access memory (RRAM) cell design with a Cr/TaO x /Al (top-to-bottom) structure. Extensive studies of the switching mechanism of the nonpolar RRAM were performed. The thermal coefficient of resistance of the RRAM in the low-resistance state is observed to adop…