Results 211 to 220 of about 181,341 (246)

Excitons trapped at impurity centers in highly ionic crystals

Physical Review B, 1985
It is shown that there are several examples of impurity ions in ionic host crystals all of whose localized excited states lie above the ionization energy of the impurity in the crystal (${\mathrm{SrF}}_{2}$:${\mathrm{Yb}}^{2+}$, ${\mathrm{BaF}}_{2}$:${\mathrm{Eu}}^{2+}$, and others).
, McClure, , Pedrini
openaire   +2 more sources

Positron-trap centers in neutron-irradiated silicon containing hydrogen

Applied Physics A: Materials Science & Processing, 1995
The defect evolution as a function of the annealing temperature has been studied in monocrystalline silicon grown in a hydrogen atmosphere and irradiated with 3.6×1017 neutrons/cm2. Positron lifetime spectroscopy has been used and the results compared with infrated absorption measurements.
XIANG TI MENG, Brusa, Roberto Sennen, R. BRUSA   +2 more
openaire   +2 more sources

The Trapping Centers of Electrons in Glass

1958
In connection with his theory of the electric breakdown of amorphous substances, Frohlich suggested that in the glass state there should be various shallow electron traps below the conduction band, characteristic of the network structure of glass. On analizing our previous work on the electrical breakdown of glass, we arrived at the same inference ...
Hazimu Kawamura, Takeo Kikuchi
openaire   +1 more source

Coordination positron‐trapping centers in vitreous chalcogenide semiconductors

physica status solidi (c), 2003
A model of radiation-induced coordination topological defects with an associate open volume is developed in order to explain the experimental results on positron annihilation lifetime measurements in γ-irradiated vitreous chalcogenide semiconductors of the ternary As – Ge – S system.
O. Shpotyuk, J. Filipecki, A. Kozdras, A. Kovalskiy   +3 more
openaire   +1 more source

Identification of Three Trapping Centers in Calcium Tungstate

physica status solidi (b), 1971
AbstractPartial thermal annealing of nominally pure calcium tungstate, after gamma irradiation at 78 °K, provided evidence for identifying three major 4900 Å thermoluminescence peaks at 0.36, 0.55, and 0.72 eV with three groups of electron spin resonance lines of paramagnetic tungsten at g001 = 2.009 and 1.843 and niobium at g001 = 2.021, respectively.
H. A. Koehler, C. Kikuchi
openaire   +1 more source

Trap-centers of self-interstitials in silicon

Applied Physics, 1980
Deep-level profiles were measured radially acrossn-type FZ silicon wafers containing A-swirl defects by applying DLTS to an array of Schottky contacts. The trapparameters were obtained very accurately using a computer-fit procedure for the full DLTS peaks. Two acceptor levels atE c −0.49 eV (σ
openaire   +1 more source

Steam Trap Maintenance As A Profit Center

Strategic Planning for Energy and the Environment, 1997
Probably one of the most overlooked profit centers in industrial management strategy is savings in energy costs. Every $1 in certified energy savings is often worth over $10 in increased sales. The author has found from actual practice that there is big corporate profit in a shrewd, diligent steam trap management program.
openaire   +1 more source

Center-trap aggregations in oxide scintillators

2013
A prompt transport of radiation induced free carriers towards luminescence centers is a key factor for an efficient conversion of high energy radiation into light in scintillator materials. However the transport stage of the scintillation process can be hampered by the presence of lattice imperfections.
openaire   +1 more source

Identification Of Trapping Centers In Calcium Tungstate.

1968
PhD ; Condensation ; University of Michigan, Horace H. Rackham School of Graduate Studies ; http://deepblue.lib.umich.edu/bitstream/2027.42/188293/2/6902336 ...
openaire   +2 more sources

Basin-centered Gas or Subtle Conventional Traps?

2008
Basin-centered gas models have been proposed to characterize various low-permeability (tight) sandstone gas plays that are an important gas resource found in many Rocky Mountain basins. Recent drilling and three-dimensional seismic results indicate that modifications are required of the currently accepted basin-centered gas models that were first ...
openaire   +1 more source