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第 241081 / 275833 页 · 当前展示 4,821,601–4,821,620 / 5,516,655 条匹配结果 · 摘要仅作预览

Synthesis and characterization of BaFe 12 O 19 /MgFe 2 O 4 nanocomposite powders

H. Bakhtiari、Q S Manuchehri Naeini、S. Haghighi 等 5 位作者2013-01-01OpenAlex

The composite powders of barium-magnesium ferrite were prepared using sol-gel auto-combustion and microwave methods. The crystal structure and the shape of nanocomposites have been compared. X-ray Diffraction (XRD), Scanning Electron Microscope (SEM) and Vibrating Sample Magnetometer (VSM) were used to investigate the…

Nanomaterials for catalytic reactionsIron oxide chemistry and applicationsMagnetic Properties and Synthesis of Ferrites

Computational Surface Science(2)

Takashi YUMURA2013-01-01Journal of the Japan Society of Colour Material

本稿では,密度汎関数法を中心にした第一原理計算においてどのように電子相関が取り込まれるかを説明する。次に,この電子相関の取り込みが,表面の構造および電子特性を決定するうえでどのような役割を演じるかを論じる。また,計算精度に影響を与える計算パラメーターについても簡単にまとめる。これらの背景を踏まえ,密度汎関数法計算を用いた研究例としてカーボンナノチューブの化学修飾について説明する。カーボンナノチューブの化学修飾として,ナノチューブ表面と共有結合を生成するものとそうでないもの,また,修飾されるのが内部表面か外部表面かに分類し,それぞれのタイプ別に説明する。さらに,密度汎関数法の最近の発展として分散力補正を行った汎関数が開発されたことに…

Chemical and Physical Properties of MaterialsElectron and X-Ray Spectroscopy TechniquesAdvanced Physical and Chemical Molecular Interactions

Crystal Structures, and Magnetic Properties of Cobalt(II) Complexes of N, N’-((1, 10-phenanthroline-2, 9-diyl)bis(methylene))diethanamine)

Tian‐Fu Liu2013-01-01Synthesis and Reactivity in Inorganic Metal-Organic and Nano-Metal Chemistry

Two cobalt(II) complexes, CoL(SCN)2 (1) and CoL(N3)2 (2) (L = N, N′-((1,10-phenanthroline-2,9-diyl)bis(methylene))dietha namine), were synthesized and characterized. The crystal structures of both complexes have been determined by X-ray diffraction analysis. Complexes 1 and 2 are neutral molecules and adopt compressed…

Metal complexes synthesis and propertiesLanthanide and Transition Metal ComplexesMagnetism in coordination complexes

Ti-46Al-2Cr-2Nb和Ti6Al4V合金的干摩擦学性能对比研究

乔竹辉、程军、李斐 等 6 位作者2013-01-01摩擦学学报

本文以商业Ti-6Al-4V 合金为参照,考察了Ti-46Al-2Cr-2Nb( 原子比) 金属间化合物在不同载荷和速率下的干摩擦学行为.结果表明: Ti-46Al-2Cr-2Nb 和Ti6Al4V 合金的摩擦系数几乎相同,而Ti-46Al-2Cr-2Nb 金属间化合物比Ti-6Al-4V 具有更好的抗磨性; Ti-46Al-2Cr-2Nb 和Ti6Al4V 合金的磨损率均随载荷的增加而增加,Ti-46Al-2Cr-2Nb 合金磨损率随滑动速率增加而增加,Ti-6Al-4V 合金磨损率却随滑动速率增加呈下降直至稳定的趋势; Ti-46Al-2Cr-2Nb 合金的磨损机制主要为疲劳磨损,Ti-6Al-4V 合金的磨损机制为塑性变形,…

Intermetallics and Advanced Alloy PropertiesTitanium Alloys Microstructure and PropertiesAdvanced materials and composites

Basic Study on Electromigration Phenomena in Pb-free Solder Joint

Masaru Fujiyoshi、Nobuhiko Chiwata、Jung‐Kyu Han 等 4 位作者2013-01-01Journal of The Japan Institute of Electronics Packaging

In flip chip technology, electromigration affects the reliability of the solder interconnections. When investigating electromigration in the solder joint, it is essential to examine the effective charge number (Z*) of the atoms involved in the electromigration. In this study, first, a solder joint with almost equivale…

3D IC and TSV technologiesCopper Interconnects and ReliabilityElectronic Packaging and Soldering Technologies

3D steam cracking reactor technology: the good, the bad and the ugly

Kevin M. Van Geem、David Van Cauwenberge、Carl Schietekat 等 4 位作者2013-01-01Ghent University Academic Bibliography (Ghent University)

Book of Abstracts, 19 pages

Nuclear Materials and PropertiesNuclear reactor physics and engineeringAdvanced Data Processing Techniques

Investigations on Kinetics for the Reaction Class of Hydrogen Abstractions from Substituted Cyclopentane by Hydroxyl Radical

Yang Zheng、Quan Zhu、Zerong Li 等 4 位作者2013-01-01化学学报

基于燃烧详细反应机理构建的需要, 采用反应类过渡态理论(RC-TST)研究了OH自由基夺取烷基环戊烷环上和侧链上氢原子的动力学. 在考察侧链氢提取反应类的16个代表反应的基础上, 本工作首次将该方法推广到环上α氢提取反应类的10个代表反应的研究, 分别建立了两类反应的线性自由能(LER)关系式. 计算结果表明, 采用RC-TST/LER方法预测的这两类反应的速率常数与直接应用TST/Eckart方法得到的结果接近, 说明RC-TST/LER方法对预测这两类反应的速率常数非常有效, 且节约了大量计算成本. 而且, 无论是侧链还是五元环, OH·夺取叔碳上的氢原子最易发生.

Catalysis and Oxidation ReactionsCatalytic Processes in Materials Science

Preparation of UV-VIS high index coating materials with PIAD using xenon as a working gas

Steffen Wilbrandt、Olaf Stenzel、Ralph Schlegel 等 4 位作者2013-01-01Optical Interference Coatings

Xenon assistance in PIAD coating deposition processes offers highest densification when applied to suitable materials. We present experimental results on HfO2 and Ta2O5 layers pursuing applications in UV coating technology.

Semiconductor materials and devicesElectron and X-Ray Spectroscopy TechniquesAdvancements in Photolithography Techniques

1-甲基-3-苯基-5-对甲苯基-6,7,8,9,10,11,12,13,14,15-十氢-3H-环十二烷[d]吡唑并[3,4-b]吡啶的微波合成和结构表征

贾润红、彭菊花、姜波 等 4 位作者2013-01-01分子科学学报:中英文版

标题化合物(C30H35N3)以4-甲基苯甲醛、环十二酮和3-甲基-1-苯基-1 H-吡唑-5-胺,在三氟乙酸和醋酸的作用下,经微波辐射合成得到.其结构通过单晶X射线衍射法确定,晶体属单斜晶系,空间群P21/c,相对分子质量Mr=437.61,晶胞参数a=1.089 26(11)nm,b=2.192 7(2)nm,c=1.049 54(14)nm,V=2.464 1(5)nm3,Z=4,晶胞密度Dc=1.180g/m3,吸收系数μ=0.069mm-1,单胞中电子的数目F(000)=944.晶体结构用直接法解出,经全矩阵最小二乘法对原子参数进行修正,最终的偏离因子为R=0.046 8,ωR=0.090 5.在晶体结构中新形成的吡啶环…

Crystallography and molecular interactionsNonlinear Optical Materials ResearchCrystal structures of chemical compounds

High Strength and Lead-free Machinable Brass Alloy

Hisashi Imai、Shufeng Li、Yoshiharu Kosaka 等 4 位作者2013-01-01Journal of the Japan Society of Powder and Powder Metallurgy

ABSTRACTIn this study, the effects of additive alloying elements on microstructure and mechanical properties of Cu – 40 % Zn alloy prepared by powder metallurgy (P/M) process were investigated. Raw Cu – 40Zn – Cr – Ti – Fe – Sn brass powders, having a single beta phase, were made by water-atomization process. Grain si…

Advanced materials and compositesMetallurgy and Material ScienceAluminum Alloys Composites Properties

Фазовые равновесия системы Na,K,Mg,Ca//SO4,Cl–H2O при 50⋅С в области кристаллизации глазерита (3K2SO4⇒ Na2SO4)

Л. Солиев2013-01-01Журнал физической химии

Методом трансляции исследованы фазовые равновесия системы Na,K,Mg,Ca//SO4,Cl H2O при 50°С в области кристаллизации глазерита (3K2SO4 · Na2SO4). Установлено, что глазерит как равновесная фаза исследуемой системы при 50°С участвует в формировании 21 нонвариантных точек, 47 моновариантных кривых и 34 дивариантных полей.…

Solid-state spectroscopy and crystallographyThermal and Kinetic AnalysisChemical and Physical Properties in Aqueous Solutions

Analysis of Transport Properties and Acoustical Parameters of Sulphanilamide in Non- Aqueous Medium

S Santhakumari2013-01-01IOSR Journal of Applied Physics

Sulphanilamide is the parent compound of all the sulpha-durgs which is important in urinary tract infections and meningococcal meningitis profilaxes. Ultrasonic velocity measurements are highly sensitive to molecular interactions and used to provide qualitative informations about the physical nature and strength of th…

Thermodynamic properties of mixturesSolid-state spectroscopy and crystallographyChemical and Physical Properties in Aqueous Solutions

Study on Two-Phase Flow in Direct Methanol Fuel Cell

Shinsuke Hirano、Shigeaki Itoh、Eiji Ejiri2013-01-01JAPANESE JOURNAL OF MULTIPHASE FLOW

The direct methanol fuel cell is one of the most promising candidates of the next-generation power sources for small electric appliances. However, there still remain some issues, one of which is regarding carbon dioxide bubbles generated in the anode channel. They tend to cover the gas diffusion layer (GDL) surface, o…

Electrocatalysts for Energy ConversionAdvancements in Solid Oxide Fuel CellsFuel Cells and Related Materials

Исследование стекол и стеклокристаллических материалов в системах Bi2O3–GeO2–Fe2O3и Bi2O3–GeO2–Cr2O3методом оптической спектроскопии

И. В. Степанова、Н. Г. Горащенко2013-01-01Оптика и спектроскопия

Сегнетоэлектрическая кристаллическая фаза Bi2GeO5 была синтезирована путем термической обработки стекол состава 1Bi2O3 1GeO2 xFe2O3 и 1Bi2O3 1GeO2 yCr2O3. Полученную стеклокерамику и исходные стекла исследовали с помощью рентгенофазового анализа и оптической спектроскопии. Проведены измерения диэлектрических характери…

Multiferroics and related materialsDielectric properties of ceramicsFerroelectric and Piezoelectric Materials

The Order Parameter of Glass Transition and Instantaneous Spin Systems with De Gennes n = 0

嘉麟 吴2013-01-01Advances in Condensed Matter Physics

在大分子的自避无规行走中,链粒子的每一步行走都伴有自旋分量数为零的瞬时自旋体系,它提供粒子合作移动所需的额外能量、体积和松弛时间。利用这些附加的瞬时自旋体系,不仅直接导出了玻璃化转变和大分子熔体蛇行模型中共同的布朗运动模式,证明了缠结分子量的长度对应与流体力学中的雷诺数;而且还证明了缠结链的本征扩散–离域模式,从冻结的玻璃态到熔融液态,都是横向似涟漪波的链尺度定向孤立波。它就是玻璃化转变的序参量。分量数为零的瞬时自旋体系的存在,不仅可统一现有的各种玻璃化转变理论,而且也为湍流的物理起源找到了新的理论。玻璃化转变作为一个范例,它是分子集团从无序到更无序直到湍流的所有“无规离域转变”中的第一层转变。 In macromolecular…

Theoretical and Computational PhysicsMaterial Dynamics and PropertiesLiquid Crystal Research Advancements

Analysis of Energy Data toward the Optimizing Use of Energy

Yoshinori Urasawa、Kensaku Kawamura2013-01-01JAPAN TAPPI JOURNAL

紙パルプ産業では,収益を確保するために,省エネルギー,操業の最適化,高効率操業への改善などの取組が行われている。省エネ活動は,現状を把握し課題を見つけるところから始まる。しかし課題を見つけるには生産データとエネルギーデータの正規化など多くの時間と解析技術が必要である。横河電機は2005年に,お客様と共有する理想のプラント“VigilantPlantビジョン”を発表した。お客様にとっての理想のプラント,操業を実現するのが,『VigilantPlant ~理想の工場』である。YOKOGAWAは,VigilantPlantをビジョンとして,お客様の最適なプラント操業を実現するためのソリューションを提供する。具体的には,「プラント操業に携…

Metallurgy and Material ScienceEnergy, Environment, Agriculture Analysis

溶胶-凝胶自燃烧法制备的CuO-ZnO/Al2O3及催化二氧化碳加氢制甲醇的性能研究

孔秀琴、唐兴江、许珊 等 4 位作者2013-01-01分子催化

采用溶胶-凝胶自燃烧法,以柠檬酸为燃料制备了多种CuO-ZnO/Al2O3催化剂.利用N2静态吸附(BET)、X射线衍射(XRD)、扫描电子显微镜(SEM)、X-射线光电子能谱(XPS)和H2程序升温还原(H2-TPR)等方法研究了柠檬酸与硝酸盐比例关系对催化剂物化性质,形貌和还原性能的影响.并将其用于二氧化碳加氢制甲醇反应,考察催化剂的CO2转化率,甲醇选择性以及甲醇时空收率等催化性能.实验结果表明,当柠檬酸用量等于化学计量比时,CuO-ZnO/Al2O3催化剂的催化性能最好,当柠檬酸用量大于化学计量比时,催化性能次之,且变化不大,但当柠檬酸用量小于化学计量比时,催化性能明显降低.这一结果与其物化性质和还原性能有关,当柠檬酸用量…

Subcritical and Supercritical Water ProcessesBiodiesel Production and ApplicationsCatalytic Processes in Materials Science

Operating Experience of Hyper-Cell Floatator

Hisashi Iwabuchi2013-01-01JAPAN TAPPI JOURNAL

国内の古紙利用率は2009年には63%に達し,更なる古紙利用率向上に向けての古紙の高度利用が進められている。一方,紙向けでの消費量の6割以上を占める新聞古紙では,新聞用紙でのカラー印刷対応等の高品質化への取り組みの中で,紙中灰分の上昇など紙質面での変化が見られ,古紙処理工程におけるフローテーターに求められる役割も変わりつつある。従来の目的であるインキの除去に加え,灰分,粘着異物に対する除去性能が求められており,これらの除去性能向上及び操業性の改善を目的とし,相川鉄工株式会社と共同で新型フローテーター「ハイパーセルフローテーター」を開発し,2008年に当社北海道工場勇払事業所DIP工程に導入した。現時点において,以下の成果が得られて…

Material Properties and ApplicationsSynthesis and properties of polymers

Structural basis for a homodimeric ATPase subunit of an ECF transporter ESEARCH ARTICLE R

Chengliang Chai、You Yu、Wei Zhuo 等 8 位作者2013-01-01OpenAlex

The transition metal cobalt, an essential cofactor for many enzymes in prokaryotes, is taken up by several specifi c transport systems. The CbiMNQO protein complex be- longs to type-1 energy-coupling factor (ECF) transporters and is a widespread group of microbial cobalt transport- ers. CbiO is the ATPase subunit (A-c…

Enzyme Structure and FunctionPorphyrin Metabolism and DisordersBacterial Genetics and Biotechnology

Physical Properties and Biodegradation of Poly(lactic Acid) Composite with Empty Fruit Bunch Fiber

Kazuko Fujiwara、Buenaventurada P. Calabia、Fumi Ninomiya 等 5 位作者2013-01-01KOBUNSHI RONBUNSHU

Biomass based composites from poly-(lactic acid) (PLA) and empty fruit bunch fiber (EFB) were prepared. The mechanical and thermal properties of PLA/EFB composites samples were discussed. As a side effect, the biodegradation rate of PLA/EFB composites was increased by incorporation of EFB. Tensile strength was further…

Natural Fiber Reinforced Compositesbiodegradable polymer synthesis and propertiesMicroplastics and Plastic Pollution