Takeharu Tsuge、Yu Saito、Yoshihiro Kikkawa 等 5 位作者2004-03-15Macromolecular Bioscience
Abstract Summary: A new strategy for bacterial polyhydroxyalkanoate (PHA) production by recombinant Ralstonia eutropha PHB − 4 harboring mutated PHA synthase genes ( phaC Ac ) from Aeromona caviae was investigated. The strain harboring wild‐type phaC Ac gene produced a PHA copolymer consisting of ( R )‐3‐hydroxybutyra…
Enzyme Catalysis and Immobilizationbiodegradable polymer synthesis and propertiesMicroplastics and Plastic Pollution
Junichi Koike2004-03-15Materials science forum
Deformation mechanisms of Mg-Al-Zn (AZ31) alloys were investigated by performing tensile test at room temperature. In fine grain Mg alloys deformed at room temperature, nonbasal slip systems were found to be active as well as basal slip systems because of grain-boundary compatibility effect. Slip-induced grain-boundar…
Magnesium Alloys: Properties and ApplicationsAluminum Alloys Composites PropertiesAdvanced Welding Techniques Analysis
Hiroshi Uyama、Mai Kuwabara、Takashi Tsujimoto 等 6 位作者2004-03-15Macromolecular Bioscience
This study deals with the preparation and properties of a new class of organic-inorganic hybrids from renewable resources. The hybrids were synthesized by an acid-catalyzed curing of epoxidized triglycerides in the presence of an organophilic montmorillonite (a modified clay). The mechanical properties were improved b…
Polymer Nanocomposites and PropertiesPolymer composites and self-healingSilicone and Siloxane Chemistry
Sundararaman Venkatraman、Rajeev Kumar、Jeyaraman Sankar 等 8 位作者2004-03-15Chemistry - A European Journal
Ferrocenyl macrocyclic conjugates involving 22 pi oxasmaragdyrins and 18 pi oxacorroles have been synthesized and characterized. The direct covalent linkage of the ferrocenyl moiety to the meso position of the macrocycle is achieved by simple oxidative coupling of appropriate precursors with trifluoroacetic acid as ca…
Metal complexes synthesis and propertiesPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
Tanja Weil、Erik Reuther、Cornelia Beer 等 4 位作者2004-03-15Chemistry - A European Journal
The synthesis of dendritic multichromophores based on a rigid polyphenylene scaffold is presented. Different rylene chromophores are incorporated into the core, the branches, and the surface of the dendrimer. In this way, two generations of dendritic dyads consisting of a terrylenediimide core, a stiff polyphenylene s…
Luminescence and Fluorescent MaterialsDendrimers and Hyperbranched PolymersPhotochromic and Fluorescence Chemistry
Elisa Zini、Massimo Baiardo、Lidia Armelao 等 4 位作者2004-03-15Macromolecular Bioscience
Flax fibers are investigated as reinforcing agents for biodegradable polyesters (Bionolle and poly(lactic acid) plasticized with 15 wt.-% of acetyltributyl citrate, p-PLLA). The composites are obtained either by high temperature compression molding fiber mats sandwiched between polymer films, or by batch mixing fibers…
Nanocomposite Films for Food PackagingNatural Fiber Reinforced Compositesbiodegradable polymer synthesis and properties
Stefano Elli、Fabio Ganazzoli、É. G. Timoshenko 等 5 位作者2004-03-15The Journal of Chemical Physics
Single-chain simulations of densely branched comb polymers, or "molecular bottle-brushes" with side-chains attached to every (or every second) backbone monomer, were carried out by off-lattice Monte Carlo technique. A coarse-grained model, described by hard spheres connected by harmonic springs, was employed. Backbone…
Polymer Surface Interaction StudiesForce Microscopy Techniques and ApplicationsNanofabrication and Lithography Techniques
Benjamin Saulnier、Stéphanie Ponsart、Jean Coudane 等 5 位作者2004-03-15Macromolecular Bioscience
Abstract Summary: Poly(lactic acid) polymers (PLA) are presently the most attractive compounds in the field of artificial degradable and biodegradable polymers. In order to enlarge the family, and thus the range of accessible properties, stereocopolymers and copolymers with various co‐monomers have been synthesized. H…
biodegradable polymer synthesis and propertiesCarbon dioxide utilization in catalysis
Gilles Tarjus、Daniel Kivelson、Stefano Mossa 等 4 位作者2004-03-15The Journal of Chemical Physics
We present a consistent picture of the respective role of density (rho) and temperature (T) in the viscous slowing down of glassforming liquids and polymers. Specifically, based in part upon a new analysis of simulation and experimental data on liquid ortho-terphenyl, we conclude that a zeroth-order description of the…
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesRheology and Fluid Dynamics Studies
Susmita Dey Sadhu、Anil K. Bhowmick2004-03-15Journal of Polymer Science Part B Polymer Physics
Abstract Nanocomposites were prepared with different grades of nitrile rubber with acrylonitrile contents of 19, 34, and 50%, with styrene–butadiene rubber (23% styrene content), and with polybutadiene rubber with Na‐montmorillonite clay. The clay was modified with stearyl amine and was characterized by X‐ray diffract…
Polymer Nanocomposites and PropertiesPolymer Nanocomposite Synthesis and IrradiationSilicone and Siloxane Chemistry
A. Janotta、R. Janssen、Matthias Schmidt 等 11 位作者2004-03-15Physical Review B
Amorphous hydrogenated silicon suboxides $(a\ensuremath{-}{\mathrm{SiO}}_{x}:\mathrm{H})$ deposited by plasma enhanced chemical vapor deposition have a band gap which can be tuned from $1.9$ to 3.0 eV by varying the oxygen content [O] from $0$ to 50 at. %. n- and p-type doping is realized by adding ${\mathrm{PH}}_{3}$…
Glass properties and applicationsThin-Film Transistor TechnologiesSilicon Nanostructures and Photoluminescence
Takashi Mukose、Tomoko Fujiwara、Junko Nakano 等 8 位作者2004-03-15Macromolecular Bioscience
Abstract Summary: A mixed suspension of the enantiomeric B‐A‐B triblock copolymers, polyoxyethylene‐ block ‐poly( L ‐lactide)‐ block ‐polyoxyethylene (PEG‐PLLA‐PEG) and polyoxyethylene‐ block ‐poly( D ‐lactide)‐ block ‐polyoxyethylene (PEG‐PDLA‐PEG), was found to induce reversible gel‐to‐sol transition depending on th…
Hydrogels: synthesis, properties, applicationsAdvanced Polymer Synthesis and Characterizationbiodegradable polymer synthesis and properties
Jun Akedo2004-03-15Materials science forum
Aerosol deposition method (ADM) for shock-consolidation of fine ceramics powder to form dense and hard layers is reported. Submicron ceramic particles were accelerated by gas flow in the nozzle up to velocity of several hundred m/s. During interaction with substrate, these particles formed thick (10 ~ 100 µm), dense,…
Advanced ceramic materials synthesisMetal and Thin Film MechanicsDiamond and Carbon-based Materials Research
A. Marmier、Stephen C. Parker2004-03-15Physical Review B
We apply an ab initio methodology to model the low index non-stoichiometric surfaces of \ensuremath{\alpha}-alumina, namely the (0001), $(011\ifmmode\bar\else\textasciimacron\fi{}2),$ $(112\ifmmode\bar\else\textasciimacron\fi{}3),$ $(112\ifmmode\bar\else\textasciimacron\fi{}0),$ $(101\ifmmode\bar\else\textasciimacron\…
Catalytic Processes in Materials ScienceCopper-based nanomaterials and applicationsElectronic and Structural Properties of Oxides
F.J. Lahoz、Inocencio R. Martín、J. Méndez‐Ramos 等 4 位作者2004-03-15The Journal of Chemical Physics
The optically active dopant distribution in a Tm(3+)-Yb(3+) doped silica based glass ceramic sample has been investigated. A systematic analysis of the upconversion fluorescence of the Tm(3+)-Yb(3+) codoped glass and glass ceramic has been performed at room temperature. Tm(3+) and Yb(3+) single doped glass and glass c…
Luminescence Properties of Advanced MaterialsGlass properties and applicationsSolid State Laser Technologies
S. A. Zvyagin、A. K. Kolezhuk、J. Krzystek 等 4 位作者2004-03-15arXiv
The magnetic excitation spectrum of copper pyrimidine dinitrate, a material containing S=1/2 antiferromagnetic chains with alternating g-tensor and the Dzyaloshinskii-Moriya interaction, and exhibiting a field-induced spin gap, is probed using submillimeter wave electron spin resonance spectroscopy. Ten excitation mod…
Materials ScienceStrongly Correlated Electrons
N. Bonini、A. Kokalj、A. Dal Corso 等 5 位作者2004-03-15arXiv
The structure and dynamics of atomic oxygen adsorbed on Ag(410) and Ag(210) surfaces have been investigated using density functional theory. Our results show that the adsorption configuration in which O adatoms decorate the upper side of the (110) steps forming O--Ag--O rows is particularly stable for both surfaces. O…
Materials Science
Ryo Maezawa、Shiro Kashimoto、Tsutomu Ishimasa2004-03-15Philosophical Magazine Letters
Starting from the Zn17Sc3 cubic approximant, new quasicrystal alloys were sought by replacement of Zn with transition elements T. In the cases when T = Mn, Fe, Co and Ni, new icosahedral quasicrystals are formed in as-cast alloys as major phases at alloy compositions of Zn75T10Sc15. All these quasicrystals belong to a…
Quasicrystal Structures and PropertiesMineralogy and Gemology Studies
Akinobu Yamaguchi、Teruo Ono、Saburo Nasu 等 6 位作者2004-03-15arXiv
Spintronic devices, whose operation is based on the motion of a magnetic domain wall (DW), have been proposed recently. If a DW could be driven directly by flowing an electric current instead of a magnetic field, the performance and functions of such device would be drastically improved. Here we report real-space obse…
Materials Science
Emo Chiellini、Patrizia Cinelli、Emo Chiellini 等 4 位作者2004-03-15Macromolecular Bioscience
Blends and composites based on environmentally degradable-ecocompatible synthetic and natural polymeric materials and fillers of natural origin have been prepared and processed under different conditions. Poly(vinyl alcohol) (PVA) was used as the synthetic polymer of choice by virtue of its capability to be processed…
biodegradable polymer synthesis and properties