Materials Literature
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For large deformations, the governing equations of elastic-plastic flow may lose their hyperbolicity and become ill posed at some critical values of the hardening modulus. This ill-posedness is characterized by uncontrolled growth of the amplitude of plane wave solutions in certain directions. To capture post-critical…
PbS microcrystallites show strong quantum confinement effects on account of the fact that the particle size is much smaller than the exciton Bohr radius, leading to large blue shifts of the optical absorption edge and the transverse optical phonon frequencies. In addition, femtosecond pump-probe experiments find a tra…
Motivated by difficulties in understanding the magnetism of the insulating parent of high-${\mathit{T}}_{\mathit{c}}$ supeconductors, we have studied the less covalent, and thus simpler, antiferromagnetic (AF) insulators NiO and ${\mathrm{KNiF}}_{3}$. We also consider the apparently covalent material ${\mathrm{La}}_{2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of Metal-meso-Octaethylporphyrinogen Complexes Leading to Novel Oxidized Forms of Porphyrinogen Other than Porphyrins. 2. The Redox Chemistry of Iron(II- and Cobalt(II)-meso-Octaethylporphyrinogen Complexes Occurring with the Formation and Cleavage of Two Cycloprop…
Femtosecond pump-probe experiments performed on squaraines demonstrate strong couplings between the first excited state and high-lying two-photon states. The experimental data agree well with our earlier quantum many-electron calculations based on multiple-excited configuration interactions. We show that high-lying tw…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Structure of the New Gold Polytelluride Anion [Au2Te12]4-Sandeep S. Dhingra and Robert C. HaushalterCite this: Inorg. Chem. 1994, 33, 13, 2735–2737Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994ht…
The kinetics of the reaction of directionally solidified eutec‐tics of yttrium‐aluminum perovskite and alumina to yttrium‐aluminum garnet were measured between 1150° and 1550°C for times as long as 20 000 min. Deformation from the 11 vol% increase was observed. Samples were characterized by optical microscopy, SEM, an…
Liquid crystalline properties of the four families with the general formula: where X = NO2, Cl, Br, F, have been investigated. Among these compounds nematic, smectic A and smectic B mesophases were found. These phase situations are compared with the isomeric families with the reversed -N=CH- central group.
This paper is concerned with formulating and evaluating a model of tongue tear. The modeling approach taken is fairly general, and results recorded to this point have been encouraging. Although predicting tearing behavior from parameters determined prior to weaving is not yet possible, the implications of this work ar…
Abstract In order to examine the spectra of films formed during the polarization of an Fe–17 Cr alloy in 0.5 M sulphuric acid, it is necessary to separate the overlapping spectral components of the film and substrate. The procedure for peak separation and background subtraction as proposed by Hansen and Tougaard was f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituent Effects on the Choice of the Orbital Preferred for Electron Spin Delocalization in Two Paramagnetic Low-Spin Iron(III) Porphyrins: Mapping the Spin Density Distribution at the Pyrrole Positions by 1H COSY and NOESY TechniquesHelming Tan, Ursula Simonis, Nikolai V…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater-Soluble Polymers. 60. Synthesis and Solution Behavior of Terpolymers of Acrylic Acid, Acrylamide, and the Zwitterionic Monomer 3-[(2-Acrylamido-2-methylpropyl)dimethylammonio]-1-propanesulfonateErich E. L. Kathmann, DeAnna D. Davis, and Charles L. McCormickCite this: M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Characterization of Photo-Cross-Linkable Small-Molecule and High-Polymeric Phosphazenes Bearing Cinnamate GroupsHarry R. Allcock and Charles G. CameronCite this: Macromolecules 1994, 27, 12, 3125–3130Publication Date (Print):June 1, 1994Publication History Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Aspects in the Electrochemical Polymerization of Organosilicon CompoundsCh. Jammegg, S. Graschy, and E. HenggeCite this: Organometallics 1994, 13, 6, 2397–2400Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal Synthesis and Structure of [(C2H5)4N][(VO)3(OH)(H2O)(C2H5PO3)3].cntdot.H2O. An Inorganic-Organic Polymer Exhibiting Undulating V/P/O Layers and Interlamellar Organic TemplatesM. Ishaque Khan, Young-Sook Lee, Charles J. O'Connor, Robert C. Haushalter, and Jon Zub…
Cotton fabrics and cellulose films treated with fluorocarbon resin (Asahi Guard AG-480 ) with and without crosslinking agents (isocyanate blocked copolymer and aziridine) were washed and subsequently heat treated. Water repellency of the fabrics decreased with washing and recovered with heat treatment. The decreased w…
Abstract Fourier‐transform infrared (FTIR) spectral studies were carried out on a polyurethane in styrene solutions at styrene concentrations from 30 to 90% (w/w). NH vibrations were studied in the stretching and bending regions. The results demonstrated that the NH groups of the polyurethane can hydrogen bond not o…
We describe here the regulatory and coding region, and DNA sequence, for a newly recognized gene, sdaC, which codes for a hydrophobic protein with several predicted membrane-spanning domains. sdaC and sdaB form a single operon, with 57 bp between the end of sdaC and the start of sdaB. Expression of the sdaCB operon is…
To evaluate cardiovascular toxicities associated with the infusion of cryopreserved grafts, we prospectively monitored the infusions of 29 autologous bone marrow transplant (BMT) recipients. Fifteen allogeneic BMT recipients served as a control group. Cardiac rhythm was recorded continuously with the Holter technique…
Protons in some alkaline earth metal‐phosphate glasses are much more mobile than monovalent ions such as Na + and Ag + ions under a dc electrical field. The O‐H bonding in those glasses that is weakened by the strong hydrogen bonding with neighboring nonbridging oxygen ions may cause the mobile protons.