2,713 research outputs found
Temperature variation of the resistivity of metallic strain gauge materials Final report
Temperature effects on electrical resistivity of metallic strain gage material
Solutions to Dynamic Equations on Varying Times Scales
Note: The mathematical symbols could not be represented. See the abstract in the thesis for complete text
Structural properties of bismuth-bearing semiconductor alloys
The structural properties of bismuth-bearing III-V semiconductor alloys are addressed. Because the Bi compounds are not known to form zincblende structures, only the anion-substituted alloys InPBi, InAsBi, and InSbBi are considered candidates as narrow-gap semiconductors. Miscibility calculations indicate that InSbBi will be the most miscible, and InPBi, with the large lattice mismatch of the constituents, will be the most difficult to mix. Calculations of the hardness of the Bi compounds indicate that, once formed, the InPBi alloy will be harder than the other Bi alloys, and substantially harder than the currently favored narrow-gap semiconductor HgCdTe. Thus, although InSbBi may be an easier material to prepare, InPBi promises to be a harder material. Growth of the Bi compounds will require high effective growth temperatures, probably attainable only through the use of nonequilibrium energy-assisted epitaxial growth techniques
Multi-scale Renormalisation Group Improvement of the Effective Potential
Using the renormalisation group and a conjecture concerning the perturbation
series for the effective potential, the leading logarithms in the effective
potential are exactly summed for scalar and Yukawa theories.Comment: 19 pages, DIAS STP 94-09. Expanded to check large N limit, typo's
corrected, to appear in Phys Rev
Obstructing mucocele of the cystic duct after transplantation of the liver
A tension mucocele was created in three hepatic homografts by ligating a low-lying cystic duct during transplant cholecystectomy and by incorporating its outflow end into the anastomosis of the common hepatic duct to the recipient common duct or Roux limb of jejunum. The consequent complication of obstruction of the biliary tract that necessitated reoperation and excision of the mucocele in all three patients can be avoided by the simple expedient of completely removing the cystic duct when feasible or providing egress to the secretion of the cystic duct as described
Electromagnetic and Gravitational Radiation of Graviatoms
Graviatom existence conditions have been found. The graviatoms (quantum
systems around mini-black-holes) satisfying these conditions contain the
following charged particles: the electron, muon, tau lepton, wino, pion and
kaon. Electric dipole and quadrupole and gravitational radiations are
calculated for the graviatoms and compared with Hawking's mini-hole radiation.Comment: 7 pages, 1 figure, 3 tables; accepted in "Astronomical and
Astrophysical Transactions
Lepton Flavor Specific Extended Higgs Model
In extended Higgs models, a discrete symmetry is needed in the quark sector
to avoid tree-level flavor-changing neutral currents. However, this is not
necessary the case in the lepton sector. We consider a model in which one Higgs
couples to quarks and three others couple to the electron, muon and tau,
respectively. This four-doublet model is presented with the full scalar
potential and the gauge and Yukawa couplings. The constraints from boundedness,
perturbativity and oblique parameters are incorporated as well as constraints
from meson-antimeson mixing, radiative B-decays and the diphoton Higgs decay
rate. We also consider bounds from searches for heavy neutral and charged
scalars at the LHC. Since the Standard Model Higgs couplings match predictions
very well, we focus on the alignment limit of the model. It is shown that for a
wide range of parameters, the lightest additional scalar, pseudoscalar and
charged scalar can have substantial decays into electrons and muons (in
contrast to the usual leptonic decays into taus). An interesting signature in
the neutral sector would be the production, through vector boson fusion, of a
pair of scalars, each of which decays into an electron or muon pair.Comment: 35 pages, 3 figures, 6 table
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