Juan Carlos Rodríguez‐Ubis、Rosa Sedano、G. Barroso 等 5 位作者1997-02-10Helvetica Chimica Acta
Abstract The synthesis of three novel pyrazole‐containing complexing acids, N,N,N′,N ′‐{2, 6‐bis[3‐(aminomethyl)pyrazol‐1‐yl]‐4‐methoxypyridine}tetrakis(acetic acid)( 1 ), N,N,N ′, N ′‐{2, 6‐bis[3‐(aminomethyl)pyrazol‐1‐yl]pyrazine}‐tetrakis(acetic acid) ( 2 ), and N,N,N ′, N ′‐{6, 6′‐bis[3‐(aminomethyl)pyrazol‐1‐yl]‐…
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
G. Gradinaru、T. S. Sudarshan、S. Gradinaru 等 5 位作者1997-02-10Applied Physics Letters
The influence of ambient temperature and applied electric field on the electrical properties of high resistivity (1–30 kΩ cm), semi-insulating (>100 kΩ cm), and insulating (1011–1012 Ω cm) single-crystal 6H–SiC is reported. Current–voltage (I–V) characteristics of lateral metal-semiconductor-metal test structur…
High voltage insulation and dielectric phenomenaSilicon Carbide Semiconductor TechnologiesLightning and Electromagnetic Phenomena
Patrick S. Doyle、Eric S. G. Shaqfeh、Alice P. Gast1997-02-10Physical Review Letters
The rheology of solvent-filled polymer brushes under steady and oscillatory shear is studied by Brownian dynamics simulation. The flow field is solved self-consistently with the polymer dynamics. We find that under steady flow the brushes are shear thinning in both normal forces and shear viscosity. During oscillatory…
Polymer Surface Interaction StudiesSurfactants and Colloidal SystemsBlood properties and coagulation
Ming Xu、Deng‐Ke Yang1997-02-10Applied Physics Letters
We developed a dual frequency cholesteric light shutter which utilizes a cholesteric liquid crystal; the dielectric anisotropy of the material changes from positive to negative when the frequency of applied voltage is increased. The shutters are switched to the transparent homeotropic texture by low frequency voltages…
Liquid Crystal Research AdvancementsElectrowetting and Microfluidic TechnologiesPhotonic Crystals and Applications
Martin T. Dove、Mark Harris、Alex C. Hannon 等 6 位作者1997-02-10Physical Review Letters
We present the results of comparative inelastic neutron scattering measurements of both amorphous and crystalline silicates. We demonstrate the presence of floppy modes in amorphous silica and potassium disilicate over the energy scale 0--5 meV. A peak is also observed at 5 meV in amorphous silica, which is traditiona…
Phase-change materials and chalcogenidesGlass properties and applicationsHigh-pressure geophysics and materials
V. A. Vas’ko、V. A. Larkin、P. A. Kraus 等 7 位作者1997-02-10Physical Review Letters
The critical current of a thin film of the high- ${T}_{c}$ superconductor ${\mathrm{DyBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7}$, when incorporated in a heterostructure in which it is separated from a ferromagnetic underlayer of ${\mathrm{La}}_{2/3}{\mathrm{Sr}}_{1/3}{\mathrm{MnO}}_{3}$ by an undoped ultrathin ${\math…
Iron-based superconductors researchMagnetic and transport properties of perovskites and related materialsPhysics of Superconductivity and Magnetism
Z.B. Guo、Yikun Du、Jinsong Zhu 等 6 位作者1997-02-10OpenAlex
Magnetic entropy change larger than that of gadolinium has been observed in polycrystalline of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ ( $x\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.2$ and 0.33) perovskite-type manganese oxide. The large magnetic entropy change produced by the a…
Magnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter PhysicsAdvanced Thermoelectric Materials and Devices
Al. L. Éfros、Matthew S. Rosen1997-02-10OpenAlex
We propose a model in which the time dependence of the photoluminescence intensity of a single nanosize quantum dot under cw excitation conditions shows a sequence of ``on'' and ``off'' periods similar to a random telegraph signal. In our model the off periods are the times when the dot is ionized and the luminescence…
Quantum Dots Synthesis And PropertiesAdvanced Semiconductor Detectors and MaterialsSemiconductor Quantum Structures and Devices
Keith G. Danielson、Hélène Baribault、David Holmes 等 6 位作者1997-02-10OpenAlex
Decorin is a member of the expanding group of widely distributed small leucine-rich proteoglycans that are expected to play important functions in tissue assembly. We report that mice harboring a targeted disruption of the decorin gene are viable but have fragile skin with markedly reduced tensile strength. Ultrastruc…
Collagen: Extraction and CharacterizationProteoglycans and glycosaminoglycans researchSkin and Cellular Biology Research
G. Benedek、Luciano Colombo、Sabrina Gaito 等 5 位作者1997-02-08The Journal of Chemical Physics
Among the hypothetical forms of fully covalent carbon lattices with either graphite-like sp2 or mixed sp2/sp3 bonding we investigated the possibility of monocrystals with a hollow structure. We have calculated the structural, elastic and electronic properties of two prototypical face–centered cubic lattices C20 and C2…
Boron and Carbon Nanomaterials ResearchCarbon Nanotubes in CompositesGraphene research and applications
Paul van der Schoot1997-02-08The Journal of Chemical Physics
A density functional theory is presented describing the isotropic-nematic transition in dispersions of self-assembled linear objects in two dimensions. It is shown that the transition is second order. The auto-correlation function of order parameter fluctuations is also calculated on both sides of the transition point…
Nonlinear Dynamics and Pattern FormationLiquid Crystal Research AdvancementsMaterial Dynamics and Properties
M. W. Matsen、Frank S. Bates1997-02-08OpenAlex
A detailed examination of the intermediate-segregation regime of diblock copolymer melts is presented using the incompressible Gaussian chain model and self-consistent field theory (SCFT). We find that the competition between interfacial tension and chain stretching used to describe behavior in the strong-segregation…
Advanced Polymer Synthesis and CharacterizationBlock Copolymer Self-AssemblyRheology and Fluid Dynamics Studies
Santi N. Ghosh、Sukumar Maiti1997-02-07Journal of Applied Polymer Science
Curing characteristics and the curing schedule of an epoxy-terminated polymer (ETP) were investigated using diaminodiphenyl ether (DADPE), diaminodiphenyl sulfone (DADPS), diaminodiphenyl methane (DADPM), and the hardener of a commercial epoxy, two-pack Araldite (Ciba-Geigy), as curing agents. The adhesive strength of…
Synthesis and properties of polymersEpoxy Resin Curing ProcessesFlame retardant materials and properties
Andris Ozols、Nina Nordman、Olli Salminen 等 4 位作者1997-02-06Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
The present state of the real time holographic recording in amorphous semiconductor films is reviewed including mechanisms, parameters, properties and applications. Effects of the coherent, incoherent and relaxational self- enhancement as well as the influence of the film structure relaxation are considered. Quasi-per…
Phase-change materials and chalcogenidesLiquid Crystal Research AdvancementsPhotorefractive and Nonlinear Optics
Alexei Kuzmin、J. Purāns1997-02-06Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
X-ray absorption spectroscopy (XAS) was used to study the local environment around tungsten and molybdenum ions in BaO-P<SUB>2</SUB>O<SUB>5</SUB>-WO<SUB>3</SUB> and CaO-P<SUB>2</SUB>O<SUB>5</SUB>-MoO<SUB>3</SUB> glasses having different composition of WO<SUB>3</SUB> and MoO<SUB>3</SUB> oxides. The W L<SUB>1,3</SUB> an…
Crystal Structures and PropertiesLuminescence Properties of Advanced MaterialsGlass properties and applications
Jānis Kleperis、J. Zubkans、A. Lūsis1997-02-06Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
The fundamental absorption edge of amorphous, polycrystalline and crystalline tungsten trioxide (WO<SUB>3</SUB>) thin films obtained by different techniques (thermal evaporation, rf plasma sputtering, chemical gas transport) was investigated. Special attention was paid to correct measurements of absorption values of a…
Surface Roughness and Optical MeasurementsLaser Material Processing TechniquesTransition Metal Oxide Nanomaterials
Normand Mousseau、Laurent J. Lewis1997-02-06arXiv
We present a detailed study of the effect of local chemical ordering on the structural, electronic, and dynamical properties of amorphous gallium arsenide. Using the recently-proposed ``activation-relaxation technique'' and empirical potentials, we have constructed two 216-atom tetrahedral continuous random networks w…
Materials Science
M. V. Ganduglia-Pirovano、J. Kudrnovsky、M. Scheffler1997-02-05arXiv
We calculate the difference of the ionization energies of a core-electron of a surface alloy, i.e., a B-atom in a A_(1-x) B_x overlayer on a fcc-B(001)-substrate, and a core-electron of the clean fcc-B(001) surface using density-functional-theory. We analyze the initial-state contributions and the screening effects in…
Materials Science
Jun-Hyung Cho、Matthias Scheffler1997-02-05arXiv
The significant discrepancy between first-principles calculations and experimental analyses for the relaxation of the (001) surface of rhodium has been a puzzle for some years. In this paper we present density functional theory calculations using the local-density approximation and the generalized gradient approximati…
Materials Science
L. Wendler、T. Kraft、M. Hartung 等 8 位作者1997-02-05arXiv
Grating-coupler-induced collective intersubband transitions in a quasi-two-dimensional electron system are investigated both experimentally and theoretically. Far-infrared transmission experiments are performed on samples containing a quasi-two-dimensional electron gas quantum-confined in a parabolic quantum well. For…
Materials ScienceMesoscale and Nanoscale Physics