Results 211 to 220 of about 18,882 (252)

Microwave dielectric properties of La5(Ti4B)O17 and Nd5(Ti4B)O17 (B = Cr, Fe) ceramics

Journal of Materials Science: Materials in Electronics, 2014
Compositions in the A5B5O17 (A = La, Nd, B = Cr, Fe) series were processed through a mixed oxide solid state sintering route. X-ray diffraction revealed an orthorhombic (Pnnm) symmetry for La5Ti4FeO17 and monoclinic (P21/b) symmetry for Nd5Ti4FeO17, associated with the higher tolerance factor of Nd5Ti4FeO17 than Nd5Ti4CrO17.
Raz Muhammad, Yaseen Iqbal, Carlos Renato Rambo   +2 more
openaire   +1 more source

MPEC 2023-O17 : 2020 PN3

2023
The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements. They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
openaire   +1 more source

Quadrupole enhancement in O17 and F17

Nuclear Physics, 1959
Abstract A previous calculation of E2 enhancement is improved, first by refining the single-particle functions, and then by using Brillouin-Wigner in place of Rayleigh-Schroedinger perturbation theory. The higher order correlations thus introduced enable one to bring the theory into agreement with the data on both O17 and F17.
G. Barton, D.M. Brink, L.M. Delves
openaire   +1 more source

O17 Douleurs neuropathiques et SEP

Douleurs : Evaluation - Diagnostic - Traitement, 2007
La sclerose en plaques (SEP) s’accompagne frequemment de douleurs. Certaines sont liees directement au processus lesionnel et de mecanisme neuropathique central, d’autres sont les consequences indirectes de la maladie. Ces douleurs aggravent le handicap de ces patients en particulier sur le plan professionnel et alterent la qualite de vie des patients.
openaire   +1 more source

EPR Study of O17- on Magnesium Oxide

The Journal of Chemical Physics, 1971
The EPR spectrum of O17- on MgO has been obtained by the reaction of N2O containing 71.9% oxygen-17 isotope with trapped electrons on an MgO surface. The spectrum of the ion is characterized by g ⊥=2.042 and g ∥=2.0013 with A⊥=19.5±0.1G and A ∥=103.2±0.1G. A quadrupole interaction of Q⊥=1.3±0.2G was also determined.
Ning-Bew Wong, Jack H. Lunsford
openaire   +1 more source

Preparation of O17-labelled glasses and glass precursers

Materials Research Bulletin, 1980
Abstract Novel methods for the preparation of O-17 labelled ionic oxide glasses which are label conservative and yield glasses at the same enrichment level as the starting materials, were designed to provide materials for the investigation of the O-17 NMR and the vibrational spectra.
J.A. Abys, D.M. Barnes, S. Feller, G.B. Rouse, W.M. Risen   +4 more
openaire   +1 more source

The 3.06 and 3.85 MeV states in O17

Nuclear Physics, 1964
Abstract The 3.06 and 3.85 MeV states in O17 have been excited by the reaction C14(α, n)O17, the gamma-ray de-excitation of these states being observed in coincidence with neutrons. The attenuated Doppler shifts of the gamma rays were measured and lead to lifetime estimates of 1.2−0.6+0.8 and ≦ 0.25 × 10−13 sec respectively.
T.K. Alexander, C. Broude, A.E. Litherland   +2 more
openaire   +1 more source

An improved technique for the preparation of O17 targets

Nuclear Instruments and Methods, 1964
Abstract This note describes an improved technique for producing thin films containing O 17 , suitable for nuclear spectroscopy. Tungsten oxide is obtained from the chemical reaction between a heated tungsten filament and enriched oxygen gas. The oxide is then evaporated on to thin carbon backings.
A.H.F. Muggleton, C.T. Parsons
openaire   +1 more source

Covalent distribution of spin in V2O3:O17 nuclear resonance

Solid State Communications, 1974
Abstract O 17 nuclear magnetic resonance has been observed in metallic V 2 O 3 with frequency shifts from (−0.10 ± 0.02)-(−0.05 ± 0.02) per cent between 170 and 460°K respectively, a linewidth of 37 ± 5 oe and spin-lattice relaxation rate 1/ T 1 ≈ 60 sec −1 at 296°K. From these quantities, covalency parameters f s /2 S = − 0.35 × 10 −3 and
A.C. Gossard, J.P. Remeika
openaire   +1 more source

Quadrupole matrix elements in O17 and F17

Nuclear Physics, 1964
Abstract The model of the low-lying states of O17 and F17 in which a distortion of the O16 core is produced by a two-particle central interaction between the odd nucleon and the core nucleons is investigated in first order perturbation theory. It is found that T = 1 excitations of the core give appreciable contributions to E2 matrix elements.
openaire   +1 more source