Materials Literature
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${\mathrm{LaCoO}}_{3}$ exhibits two magnetic-electronic transitions, one near 90 K and a second near 500 K. A previous study of the paramagnetic scattering using polarized neutrons demonstrated that the low-temperature transition is associated with the thermal excitation of ${\mathrm{Co}}^{3+}$ ions from the low-spin…
A reduced variable conformational sampling strategy for macromolecules based on molecular dynamics in torsion angle space is evaluated using crystallographic refinement as a prototypical search problem. Bae and Haug's algorithm for constrained dynamics [Bae, D.S., Haug, E.J. A recursive formulation for constrained mec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of Novel Oriented Transparent Films of Layered Silica-Surfactant NanocompositesMakoto OgawaCite this: J. Am. Chem. Soc. 1994, 116, 17, 7941–7942Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994https…
1. The photolabile Ca2+ chelator DM-nitrophen was injected into crayfish motor neuron terminals and photolyzed with light flashes of different intensity to determine the cooperativity of Ca2+ action in releasing neurotransmitter. 2. Each flash elicited a phasic postsynaptic response resembling an excitatory junctional…
A model for the oxidation kinetics of SiC‐coated 2D C/SiC composites is developed on the basis of mechanisms derived from TGA data (between 700° and 1500°C in dry oxygen or air, P = 100 kPa). Carbon/oxygen reaction, gas phase diffusion through microcracks present in the external SiC coating, and silica growth are the…
A model of hard spherocylinders exhibiting Brownian dynamics in a solvent is investigated by Brownian dynamics simulations. Long-time translational and rotational self-diffusion coefficients are calculated in the disordered phase over the whole range of densities and a ratio p of total length to width ranging from 1 t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange Coupling in Homo- and Heterodinuclear Complexes CuIIM [M = Cr(III), Mn(III), Mn(II), Fe(III), Co(III), Co(II), Ni(II), Cu(II), Zn(II)]. Synthesis, Structures, and Spectroscopic PropertiesFrank Birkelbach, Manuela Winter, Ulrich Floerke, Hans-Juergen Haupt, Christian…
Profile and Bragg R values are discussed with respect to different versions of the Rietveld program. The R values calculated from an exemplary neutron diffraction pattern are compared. Results obtained by a modified treatment of background and by a simplified method to decompose an observed pattern into Bragg intensit…
The elastic modulus ( E ), the critical strain energy release rate ( G c ), and the flexural strength (σ) have been determined for two partially dense alumina bodies produced from the same powder but with different initial densities. The mechanical properties were measured for specimens fabricated at four different re…
The oxidation behavior of a 2D woven C/SiC composite partly protected with a SiC seal coating and heat‐treated (stabilized) at 1600°C in inert gas has been investigated through an experimental approach based on thermogravimetric analyses and optical/electron microscopy. Results of the tests, performed under flowing ox…
We have observed a coherent oscillation of zone-folded acoustic phonons in GaAs-AlAs superlattices for the first time by means of a femtosecond time-resolved pump-probe technique. The oscillatory component in the time-resolved reflection signal corresponds to the upper branch (${B}_{2}$ symmetry) of the first-order do…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward "Willowlike" Thermotropic DendrimersVirgil Percec, Peihwei Chu, and Masaya KawasumiCite this: Macromolecules 1994, 27, 16, 4441–4453Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994https://pubs.acs.org…
In a search for high-magnetostrictive materials we have discovered in FeRh a large induced volume magnetostriction (\ensuremath{\approxeq}0.82%) at and above room temperature. Thermal-expansion measurements performed on the ordered CsCl crystallographic structure of FeRh in the temperature range 250--800 K reveal Inva…
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Abstract The open‐loop optimal control strategy to regulate the crystal‐size distribution of batch cooling crystallizers handles input, output, and final‐time constraints, and is applicable to crystallization with size‐dependent growth rate, growth dispersion, and fines dissolution. The objective function can be formu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFused Polycyclic Aromatics via Electrophile-Induced Cyclization Reactions: Application to the Synthesis of Graphite RibbonsMarc B. Goldfinger and Timothy M. SwagerCite this: J. Am. Chem. Soc. 1994, 116, 17, 7895–7896Publication Date (Print):August 1, 1994Publication History…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-State 13C NMR of Nephila clavipes Dragline Silk Establishes Structure and Identity of Crystalline RegionsAlexandra Simmons, Ed Ray, and Lynn W. JelinskiCite this: Macromolecules 1994, 27, 18, 5235–5237Publication Date (Print):August 1, 1994Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin Transitions and Thermal Hysteresis in the Molecular-Based Materials [Fe(Htrz)2(trz)](BF4) and [Fe(Htrz)3](BF4)2.cntdot.H2O (Htrz = 1,2,4-4H-triazole; trz = 1,2,4-triazolato)Jonas Kroeber, Jean-Paul Audiere, Renee Claude, Epiphane Codjovi, Olivier Kahn, Jaap G. Haasnoot,…
Research Article| August 01 1994 NAD+-dependent formate dehydrogenase V O Popov; V O Popov 1A. N. Bakh Institute of Biochemistry, Russian Academy of Sciences, Leninskiy pr. 33, 117071, Moscow, Russia Search for other works by this author on: This Site PubMed Google Scholar V S Lamzin V S Lamzin 1A. N. Bakh Institute o…
Abstract Dragline silk from the spider, Nephila clavipes , was characterized by thermal analysis (TGA, DSC, DMA), computational modeling, scanning electron microscopy and by quasi‐static as well as high rates of strain. Thermal stability to about 230°C was observed by TGA, two transitions by DMA, −75°C, representative…