19F Relaxation Rate Enhancement and Frequency Shift with Gd-DTPA
RATNER, ADAM V. MD; QUAY, STEVEN MD, PhD; MULLER, HOLDE H. MS; SIMPSON, BEVERLY BRADLEY BS; HURD, RALPH PhD; YOUNG, STUART W. MD Author Information
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Alpha ‐ Ta2 O 5 : An Intrinsic Fast Oxygen Ion Conductor
Nonstoichiometry and charge transport properties of have been investigated as functions of doping level, temperature, and thermal history. Undoped and single‐crystals and undoped, , , , , , and polycrystalline specimens of have been characterized using complex impedance techniques. The magnitude of ionic conductivitie…
Hydroxylation of Alkanes Catalyzed by Manganese Tetraphenylporphyrin Immobilized on Imidazole-modified Silica Gel
Abstract Immobilization of Mn(TPP)Cl (TPP = tetraphenylporphyrin) onto 3-imidazolylpropyl-modified SiO2 resulted in enhancement of its activity for hydroxylation of cyclohexane; the support prevented the complex from forming a dimer leading to oxidative destruction.
Potassium in Atlantic Coastal Plain Soils: I. Soil Characterization and Distribution of Potassium
Abstract Corn ( Zea mays L.) grown on sandy Atlantic Coastal Plain soils is often unresponsive to applications of K fertilizer. As part of a field study on the response of irrigated, intensively managed corn to K applications, we characterized four representative Hapludults from the Delaware Coastal Plain and evaluate…
Role of surface bonding on liquid-crystal alignment at metal surfaces
The alignment of a nematic liquid crystal, 4'-n-pentyl-4-cyanobiphenyl (5CB), on several smooth metal (Cr, Cu, Ag, and Au) surfaces was observed experimentally. Perpendicular (homeotropic) induced alignment was observed for Cu and Ag boundary layers, whereas parallel alignment was observed for Cr and Au. These differe…
NewLi2−xCuxFeS2(0≤x≤1) andCuxFeS2(∼0.25≤x≤1) phases
${\mathrm{Li}}_{2\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Cu}}_{\mathrm{x}}$${\mathrm{FeS}}_{2}$ forms a solid solution for 0\ensuremath{\le}x\ensuremath{\le}1. The crystal structures of ${\mathrm{LiCuFeS}}_{2}$ [a=3.807(2) A\r{} and c=6.352(1) A\r{}] and ${\mathrm{Li}}_{1\mathrm{\ensuremath{-}}\mathrm{\ensuremath…
Atomistic calculations of point-defect interaction and migration energies in the core of an edge dislocation in NaCl
Point-defect-dislocation interaction and migration energies within the core of an edge dislocation have been calculated using atomistic models. Point-ion as well as shell and breathing-shell models have been used. For vacancies, the greatest binding energies are at the dislocation's edge and are from three to four tim…
A Comparison of Mineral Weathering Trends Between Two Management Systems on a Catena of Loess‐Derived Soils
Abstract This study was an attempt to predict potential long‐term mineralogical transformation trends in soils under continuous no‐tillage management using the in situ soil solution composition as a sensitive index of changes occurring in the soil system. Mineralogical and soil solution compositions of surface and sub…
Micro-Raman Spectroscopy of Selected Solid U x O y F z Compounds
Micro-Raman spectroscopy has been utilized to examine the spectra of solid samples of α-UF 5 , β-UF 5 , UF 6 , three types of UO 2 F 2 , the powder residue from a static UF 6 release, and γ-UO 3 . The spectra are presented and compared to previous literature values, with new features indicated where appropriate. With…
Kinetic modelling and optimization of the trifluoropropylmethylsiloxane polymerization
Abstract Use of promoter dimethylsulfoxide (DMSO) in conjunction with initiator normal butyllithium has resulted in rapid and controllable ring‐opening polymerization of 1,3,5‐tris‐(3′,3′,3′‐trifluoro‐propyl)1,3,5‐trimethylcyclotrisiloxane at 40°C; monomer consumption rate can be varied by at least four orders of magn…
The influence of high pressure on the disordering of the crystal structure of solids rapidly quenched from the melt
The results of the rapid quenching from the melt of the pure metals (In, Pb) at high pressures 0.7-8.0 GPa with a cooling rate ~ 10 3 K s −1 are presented. The supercooling of the melt was measured, and the high pressure influence on the basic parameters of the solidification process are analysed. The short-range orde…
Thermal behavior of several hyperquenched organic glasses
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal behavior of several hyperquenched organic glassesG. P. Johari, Andreas Hallbrucker, and Erwin MayerCite this: J. Phys. Chem. 1989, 93, 6, 2648–2652Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published inissue 1 March 1989https:…
A novel copper(I) complex with bridging alkyne ligands. The synthesis and structural characterization of [Cu4(O2CCF3)4(.mu.-EtC.tplbond.CEt)2]
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel copper(I) complex with bridging alkyne ligands. The synthesis and structural characterization of [Cu4(O2CCF3)4(.mu.-EtC.tplbond.CEt)2]Daniel L. Reger, Mark F. Huff, Thomas A. Wolfe, and Richard D. AdamsCite this: Organometallics 1989, 8, 3, 848–850Publication Date (P…
Effects of CaO on the Strength and Toughness of AIN
Fully dense, undoped AIN is found to have the following average mechanical properties: hardness, 12.2 GPa; strength, 377 MPa; and fracture toughness (based on the fracture load sustained by indented disks), 3.6 MPa·m½. The addition of 2 wt% CaO to AIN changes the fracture mode from transgranular to intergranular while…
Formation of the silver hexameric (Ag6x+) cluster in zeolite A
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of the silver hexameric (Ag6x+) cluster in zeolite ARobert A. Schoonheydt and Hugo LeemanCite this: J. Phys. Chem. 1989, 93, 5, 2048–2053Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published inissue 1 March 1989https://doi.or…
Effect of TiO 2 on the Sintering and the Electrical Conductivity of Cr 2 O 3
The effect of TiO 2 addition on the sintering behavior and the electrical conductivity of Cr 2 O 3 was studied at 1473 K at various oxygen pressures, 10 5 > P o 2 > 10 −10 Pa. TiO 2 addition of more than 1 wt% drastically enhanced the sintering of Cr 2 O 3 in the oxygen pressure range 10 −3 Pa > P o 2 because…
Curing of polyimides
Abstract The imidization of films of the polyamic acid obtained from reaction of pyromellitic dianhydride (PMDA) with oxydianiline (ODA) was studied by dynamic mechanical thermal analysis (with the Polymer Labs DMTA), Two process regions are observed. The first process is characterized by decomplexation of the NMP/pol…
Procedure for correct refocusing of the Rotman lens according to Snell's law
A procedure is derived for proper refocusing of a dielectric-filled Rotman lens with beam port locations determined according to Snell's law. The theoretical performance of such a lens is compared with that of a conventional design at wide scan angle and the design equations for correct refocusing of the refracting le…
Calorimetric study of smectic polymorphism in octyloxyphenyl-nitrobenzoyloxy benzoate + decyloxyphenyl-nitrobenzoyloxy benzoate mixtures
Binary mixtures of octyloxyphenyl-nitrobenzoyloxy benzoate (${\mathrm{DB}}_{8}$${\mathrm{ONO}}_{2}$) and decycloxyphenyl-nitrobenzoyloxy benzoate (${\mathrm{DB}}_{10}$${\mathrm{ONO}}_{2}$) exhibit a rich variety of smectic polymorphism. An ac calorimetric study has been carried out on six mixtures with mole percent X…
Multimode network description of a planar periodic metal-strip grating at a dielectric interface-II: small-aperture and small-obstacle solutions
For pt.I see ibid., vol.37, no.3, p.534-41 (1989). Two analytical small-argument solution procedures for integral equations are presented. Explicit expressions for the elements of the coupling matrices in the small-aperture and small-obstacle ranges are derived for both TE and TM polarizations. Simple and useful equiv…