Bernd Minnich、Hannes Leeb、Leeb 等 6 位作者1999-07-01Journal of Microscopy
A method for accurate dimensional and angular measurements of microstructures analysed in the scanning electron microscope is described. The method considers central and parallel projections and involves (a) digital image acquisition of stereopaired images from the scanning electron microscope's photodisplay, (b) gene…
Machine Learning in Materials ScienceElectron and X-Ray Spectroscopy TechniquesX-ray Diffraction in Crystallography
Sergey Vyazovkin、Nicolas Sbirrazzuoli1999-07-01Macromolecular Rapid Communications
Epoxy-anhydride cure has been studied by differential scanning calorimetry under nonisothermal conditions. The isoconversional method of kinetic analysis yields a dependence of the effective activation energy on the extent of conversion (α) that increases from ≈ 20 to 70 kJ·mol–1 with increasing α. The occurrence of t…
Polymer crystallization and propertiesEpoxy Resin Curing ProcessesThermal and Kinetic Analysis
Kai‐Tak Wan1999-07-01The Journal of Adhesion
A linear elastic solution is proposed for a circular disc in transition from a plate-like (pure bending) to a membrane-like behavior (pure stretching) under a central point load. The strain energy release rate for film delamination is found to be G = χ(Pw 0/πa 2) with χ a numerical constant varying from 1/2 for a plat…
Force Microscopy Techniques and ApplicationsAdvanced Surface Polishing TechniquesHigh-Velocity Impact and Material Behavior
Alessandro Martucci、Jochen Fick、Jochen Schell 等 5 位作者1999-07-01Journal of Applied Physics
Thin silica–titania films doped with different concentration of PbS quantum dots (PbS/oxide molar ratios ranging from 5% to 25%) were fabricated via a sol-gel route. The structural properties were studied by x-ray diffraction, high-resolution transmission electron microscopy, and Rutherford backscattering spectrometry…
Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsNonlinear Optical Materials Studies
Sung S. Kim、T. H. Sanders1999-07-01Journal of the American Ceramic Society
A range of compositions and temperatures below the monotectic temperature exists where there are thermodynamic restrictions that prevent the equilibrium solid from forming directly from the undercooled homogeneous liquid. In this region, the solid can form only after liquid‐liquid phase separation has occurred. As sug…
Material Dynamics and PropertiesMetallurgical Processes and ThermodynamicsCrystallization and Solubility Studies
Shane A. Catledge、Yogesh K. Vohra1999-07-01Journal of Applied Physics
We report on the microstructure and mechanical properties of diamond films grown using varying nitrogen additions to a plasma with a high-CH4 fraction of 15% (in hydrogen) and an operating pressure of 125 Torr. Films were grown at N2/CH4 ratios ranging from 0 to 0.30 by fixing the CH4 flow rate and changing only the N…
Metal and Thin Film MechanicsDiamond and Carbon-based Materials ResearchAdvanced materials and composites
Mehmet Ali Gülgün、V.I. Putlayev、M. Rühle1999-07-01Journal of the American Ceramic Society
The influence of yttrium doping on the microstructure and microchemistry of hot‐pressed α‐alumina was investigated using a combination of electron microscopy techniques. The implications of microstructure and microchemistry on the improved creep behavior of the doped material are discussed. The samples doped only with…
Advanced ceramic materials synthesisGlass properties and applicationsMicrowave Dielectric Ceramics Synthesis
Rodney R. Boyer、D. Eylon、G. Luetjering1999-07-01OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)
This symposium was international in nature, with leaders in the fields of fatigue technology and the metallurgy of titanium from the US, Europe and Asia. It covered basic research, development, applications and modeling--life predictions and design of both fatigue crack initiation and propagation of titanium alloys. T…
Intermetallics and Advanced Alloy PropertiesTitanium Alloys Microstructure and PropertiesMaterial Properties and Applications
Eugenio Coronado、Christophe Mingotaud1999-07-01Advanced Materials
Thin organic films with interesting magnetic propertiessuch as the magnetic memory effect have been achieved using the Langmuir–Blodgett technique. Results are summarized in this report whereby polyoxometalate anions containing magnetically active transition metals have been incorporated as layers of discrete clusters…
Marine and coastal ecosystemsPolyoxometalates: Synthesis and Applications
John A. Rotole、Peter M. A. Sherwood1999-07-01Journal of Vacuum Science & Technology A Vacuum Surfaces and Films
The determination of the detailed chemical nature of oxidized aluminum species is an essential requirement for the study of many important practical aspects associated with aluminum metal and its compounds. While thick oxidized films of aluminum metal can be easily characterized by x-ray powder diffraction when the fi…
X-ray Spectroscopy and Fluorescence AnalysisElectron and X-Ray Spectroscopy TechniquesX-ray Diffraction in Crystallography
Frederick H. Streitz、J. W. Mintmire1999-07-01Physical review. B, Condensed matter
We present results for total-energy simulations of the energetics of vacancy occupation of \ensuremath{\gamma} alumina using an empirical potential that allows the ionic valence to vary according to the local environment and includes Coulombic electrostatic interactions among the anions and cations. Our model predicts…
Advanced ceramic materials synthesisNuclear materials and radiation effectsX-ray Diffraction in Crystallography
Francis W. Starr、Marie‐Claire Bellissent‐Funel、H. Eugene Stanley1999-07-01Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
We use molecular-dynamics simulations to study the effect of temperature and pressure on the local structure of liquid water in parallel with neutron-scattering experiments. We find, in agreement with experimental results, that the simulated liquid structure at high pressure is nearly independent of temperature, and r…
Phase Equilibria and ThermodynamicsMaterial Dynamics and PropertiesQuantum, superfluid, helium dynamics
Isabel M. Sáez、John W. Goodby1999-07-01Liquid Crystals
Liquid crystalline dendrimers are proving to be a fascinating class of materials that possess unusual physical properties. The self-assembling process involved in the formation of the mesomorphic state apparently deforms the spherical disposition of the supermolecular dendrimers to give rod-like entities that pack tog…
Liquid Crystal Research AdvancementsAdvanced Materials and MechanicsSilicone and Siloxane Chemistry
Scott S. Turner、Peter Day、K. M. Abdul Malik 等 8 位作者1999-07-01Inorganic Chemistry
The new charge transfer salt, beta' '-(bedt-ttf)(4)[(H(3)O)Fe(C(2)O(4))(3)].C(5)H(5)N, I, (bedt-ttf = bis(ethylenedithio)tetrathiafulvalene) has a crystal structure closely similar to that of the reported salt beta' '-(bedt-ttf)(4)[(H(3)O)Fe(C(2)O(4))(3)].C(6)H(5)CN, II, which has a superconducting critical temperatur…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
V. Bondzie、Stephen C. Parker、Charles T. Campbell1999-07-01Journal of Vacuum Science & Technology A Vacuum Surfaces and Films
Very tiny Au particles on TiO2 show excellent activity and selectivity in a number of oxidation reactions. We have studied the vapor deposition of Au onto a TiO2(110) surface using x-ray photoelectron spectroscopy, low energy ion scattering, low energy electron diffraction, and temperature programmed description (TPD)…
Electrocatalysts for Energy ConversionCatalytic Processes in Materials ScienceCopper-based nanomaterials and applications
Katsumi Yoshino、Hirotake Kajii、Hisashi Araki 等 6 位作者1999-07-01Fullerene Science and Technology
Various novel photo-physical properties such as a drastic photoluminescence quenching and photoconductivity enhancement and a photo-induced enhancement of low-field microwave absorption due to a highly effective photo-induced electron transfer have been observed in various conducting polymers doped with fullerenes and…
Organic Electronics and PhotovoltaicsCarbon Nanotubes in CompositesConducting polymers and applications
Jianjun Dong、Otto F. Sankey、G. Kern1999-07-01Physical review. B, Condensed matter
We study the vibrational properties of pure type-II silicon clathrate $({\mathrm{Si}}_{136})$ using first-principles electronic structure methods. The results of our calculations are consistent with recent Raman experiments. We explore the effects of pressure on its open framework and determine the equation of state a…
Ferroelectric and Piezoelectric MaterialsSilicon Nanostructures and PhotoluminescenceSemiconductor materials and interfaces
Kazunori Taguchi、Yoshihiro Aoyagi、Hiromi Matsusaki 等 5 位作者1999-07-01FEMS Microbiology Letters
The Escherichia coli 3-ketoacyl-ACP reductase gene (fabGEc) was cloned using a PCR technique to investigate the metabolic link between fatty acid metabolism and polyhydroxyalkanoate (PHA) production. Three plasmids respectively harboring fabGEc and the poly-3-hydroxyalkanoate synthesis genes phaCAc and phaC1Ps from Ae…
biodegradable polymer synthesis and propertiesMicroplastics and Plastic PollutionBiopolymer Synthesis and Applications
Erika Pringsheim、Ewald Terpetschnig、Sergey A. Piletsky 等 4 位作者1999-07-01Advanced Materials
A sugar-binding polymer film capable of continuous sensingarises from the copolymerization of aniline and 3-aminophenylboronic acid. Its absorption spectrum between 500 and 800 nm undergoes large changes on addition of various saccharides at neutral pH, changes which are dependent on the saccharide concentration and a…
Electrochemical sensors and biosensorsConducting polymers and applicationsAnalytical Chemistry and Sensors
I.V. Kityk、B. Sahraoui1999-07-01Physical review. B, Condensed matter
Photoinduced nonlinear optical phenomena in amorphous ${\mathrm{As}}_{2}{\mathrm{Te}}_{3}{\ensuremath{-}\mathrm{C}\mathrm{a}\mathrm{C}\mathrm{l}}_{2}{\ensuremath{-}\mathrm{P}\mathrm{b}\mathrm{C}\mathrm{l}}_{2}$ glasses have been studied using experimental and theoretical quantum chemical and molecular-dynamics methods…
Glass properties and applicationsCrystal Structures and PropertiesPhase-change materials and chalcogenides