Yuh‐Yih Chien、Ken‐Tsung Wong、Pi‐Tai Chou 等 4 位作者2002-11-01Chemical Communications
Some 9,9'-spirobifluorene-bridged bipolar systems 1-3 containing 1,3,4-oxadiazole-conjugated oligoaryl and triarylamine moieties have been synthesized, in which 1 exhibits remarkable solvent-polarity dependent fluorescence properties due to a highly efficient photoinduced electron transfer reaction.
Molecular Sensors and Ion DetectionOrganic Light-Emitting Diodes ResearchLuminescence and Fluorescent Materials
Luke Nelson2002-11-01Materials Science and Technology
Piezoelectric materials are capable of actuation and sensing and have found uses in applications including ultrasonic transducers, hydrophones, micropositioning devices, accelerometers, and structural actuators. A composite configuration for structural actuation having significant advantages over conventional piezoele…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesDielectric materials and actuators
Leonid A. Solovyov、В. И. Зайковский、А. Н. Шмаков 等 5 位作者2002-11-01The Journal of Physical Chemistry B
The model of structure and structural transformation of the mesostructured carbon material CMK-1 was established by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) investigations. The investigations showed that the enantiomeric carbon subframeworks formed within the pores of the MCM-48 mesopo…
Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisAerogels and thermal insulation
W. Seifert、M. Ueltzen、E. M�ller2002-11-01physica status solidi (a)
Applying a one-dimensional formulation, the authors give a short overview on thermoelectric effects. Starting from the first principles of thermoelectricity, differential equations governing the coupling of thermal and electric transports have been analytically and numerically solved by the software tool Mathematica.…
Advanced Thermoelectric Materials and DevicesThermal properties of materialsAdvanced Thermodynamics and Statistical Mechanics
Minghui Li、Francis Kwok、Wenrui Chang 等 8 位作者2002-11-01Journal of Biological Chemistry
The three-dimensional structures of brain pyridoxal kinase and its complex with the nucleotide ATP have been elucidated in the dimeric form at 2.1 and 2.6 A, respectively. Results have shown that pyridoxal kinase, as an enzyme obeying random sequential kinetics in catalysis, does not possess a lid shape structure comm…
RNA and protein synthesis mechanismsEnzyme Structure and FunctionRNA modifications and cancer
S. M. Rossnagel2002-11-01Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena
The electrical resistivity of thin films of Ta and TaN has been examined as a function of film thickness and other processing parameters. The films were deposited by magnetron sputtering of Ta cathodes with Ar, or mixtures of Ar and N2 for the case of TaN. Ta films deposited on silicon dioxide or Cu surfaces were alwa…
Metal and Thin Film MechanicsSemiconductor materials and devicesCopper Interconnects and Reliability
Maria Forsyth、Kerryn Wilson、Thomas Behrsing 等 6 位作者2002-11-01CORROSION
This paper discusses the effectiveness and mechanism of inhibition of a number of novel corrosion inhibitors for mild steel, based on cerium (III) and substituted carboxylates. The organic component was chosen to be benign, and known to have some inhibitive action in its own right. The compounds discussed in this work…
Corrosion Behavior and InhibitionConcrete Corrosion and DurabilityMaterial Properties and Failure Mechanisms
Petros Sofronis、I.M. Robertson2002-11-01Philosophical magazine. A/Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties
In-situ deformation studies in a transmission electron microscope equipped with an environmental cell have shown that solute hydrogen increases the velocity of dislocations, decreases the stacking-fault energy, and increases the stability of edge character dislocations. Theoretical modelling has established that the h…
Corrosion Behavior and InhibitionHydrogen embrittlement and corrosion behaviors in metalsNuclear Materials and Properties
Oliver Kappertz、R. Drese、Matthias Wuttig2002-11-01Journal of Vacuum Science & Technology A Vacuum Surfaces and Films
Thin ZnO and ZnO:Al films have been prepared by reactive dc magnetron sputtering, using both metallic and ceramic targets. The influence of oxygen flow and total pressure on film stress, structure, texture, and surface roughness has been examined. The properties of the films strongly depend on the deposition condition…
ZnO doping and propertiesMetal and Thin Film MechanicsCopper-based nanomaterials and applications
Francesca Sparla、Paolo Pupillo、Paolo Trost2002-11-01Journal of Biological Chemistry
The regulatory isoform of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) is a light-activated enzyme constituted by subunits GapA and GapB. The NADPH-dependent activity of regulatory GAPDH from spinach chloroplasts was affected by the redox potential (E(m,7.9), -353 +/- 11 mV) through the action of thioredoxin f. Th…
Microbial Metabolic Engineering and BioproductionEnzyme Structure and FunctionRedox biology and oxidative stress
T. Kuki、Hideo Fujikake、T. Nomoto2002-11-01IEEE Transactions on Microwave Theory and Techniques
A method was investigated to reduce the insertion loss and response time in the phase shift in a microwave variable delay line using liquid crystal (LC). In variable delay lines using conventional nematic LC, reducing the insertion loss conflicts with reducing the phase-shift response-time dependence on the thickness…
Liquid Crystal Research AdvancementsAdvanced Antenna and Metasurface TechnologiesPlant Reproductive Biology
Ki Woong Kim、Seong Ihl Woo2002-11-01Macromolecular Chemistry and Physics
To prepare poly(lactic acid) (PLA) with improved mechanical properties, high-molecular-weight poly(L-lactic acid) (PLLA) was synthesized by the direct polycondensation of lactic acid in solution phase. During polymerization, the molecular weight of PLA was influenced by the water content present in the solution; thus,…
Bone Tissue Engineering Materialsbiodegradable polymer synthesis and propertiesCarbon dioxide utilization in catalysis
Haoguo Zhu、Deborah J. Jones、Jerzy Zając 等 6 位作者2002-11-01Chemistry of Materials
Highly ordered large mesopore organosilicas have been obtained by direct liquid crystal templating in acid media using bridged silsesquioxane (EtO) 3 Si−CH 2 −CH 2 −Si(OEt) 3 [bis(triethoxysilyl)ethane, BTSE] precursor and triblock copolymers as structure-directing species. The degree of long-range ordering of the str…
Metal-Organic Frameworks: Synthesis and ApplicationsMesoporous Materials and CatalysisPolyoxometalates: Synthesis and Applications
Thilo Dollase、H. W. Spieß、Moshe Gottlieb 等 4 位作者2002-11-01Europhysics Letters (EPL)
Calorimetric studies of the crystallization behavior of physically and chemically crosslinked semicrystalline polymer, polydimethylsiloxane ( PDMS) are presented. Physical crosslinks are introduced either via entanglements in high-molecular- weight PDMS, or by anchoring chain ends to rigid polyethylene oxide (PEO) end…
Polymer crystallization and propertiesMaterial Dynamics and PropertiesPolymer composites and self-healing
C. Ceccarelli、Neil B. Grodsky、Nandana Ariyaratne 等 5 位作者2002-11-01Journal of Biological Chemistry
The crystal structure of porcine heart mitochondrial NADP+-dependent isocitrate dehydrogenase (IDH) complexed with Mn2+ and isocitrate was solved to a resolution of 1.85 A. The enzyme was expressed in Escherichia coli, purified as a fusion protein with maltose binding protein, and cleaved with thrombin to yield homoge…
Protein Structure and DynamicsEnzyme Structure and FunctionBiochemical and Molecular Research
Takafumi Kusunose、Tohru Sekino、Yong‐Ho Choa 等 4 位作者2002-11-01Journal of the American Ceramic Society
The machinability and deformation mechanism of Si 3 N 4 /BN nanocomposites were investigated in the present work. The fracture strength of Si 3 N 4 /BN microcomposites remarkably decreased with increased hexagonal graphitic boron nitride ( h ‐BN) content, although machinability was somewhat improved. However, the nano…
Advanced ceramic materials synthesisDiamond and Carbon-based Materials ResearchAdvanced materials and composites
Xiangmin Han、Kurt W. Koelling、David L. Tomasko 等 4 位作者2002-11-01Polymer Engineering and Science
Abstract The continuous production of polystyrene microcellular foams with supercritical CO 2 was achieved on a two‐stage single‐screw extruder. Simulations related to the foaming process were accomplished by modeling the phase equilibria with the Sanchez‐Lacombe equation of state and combining the equations of motion…
Phase Equilibria and ThermodynamicsInjection Molding Process and PropertiesPolymer Foaming and Composites
Jihong She、Jianfeng Yang、Naoki Kondo 等 6 位作者2002-11-01Journal of the American Ceramic Society
Porous silicon carbide (SiC) ceramics were fabricated by an oxidation‐bonding process in which the powder compacts are heated in air so that SiC particles are bonded to each other by oxidation‐derived SiO 2 glass. Because of the crystallization of amorphous SiO 2 glass into cristobalite during sintering, the fracture…
Advanced ceramic materials synthesisRecycling and utilization of industrial and municipal waste in materials productionAdvanced materials and composites
Gerd Ulrich Balcke、Н. А. Куликова、Sebastian Hesse 等 6 位作者2002-11-01Soil Science Society of America Journal
Eleven well characterized humic substances (HSs) were adsorbed from aqueous solution onto a Na‐kaolin clay. The adsorption affinity ( K L ), maximum adsorption capacity ( b ), a coefficient of desorption hysteresis ( H ), and the concentration of irreversibly adsorbed HS (IHS) were derived from adsorption‐desorption i…
Geology and Paleoclimatology ResearchClay minerals and soil interactionsPhosphorus and nutrient management
Takafumi Kusunose、Tohru Sekino、Yong Ho Choa 等 4 位作者2002-11-01Journal of the American Ceramic Society
A chemical process for fabrication of Si 3 N 4 /BN nanocomposite was devised to improve the mechanical properties. Si 3 N 4 /BN nanocomposites containing 0 to 30 vol% hexagonal BN ( h ‐BN) were successfully fabricated by hot‐pressing α‐Si 3 N 4 powders, on which turbostratic BN ( t ‐BN) with a disordered layer structu…
Advanced ceramic materials synthesisBoron and Carbon Nanomaterials ResearchMXene and MAX Phase Materials