10,581 research outputs found
Meta-Stable Brane Configurations with Seven NS5-Branes
We present the intersecting brane configurations consisting of NS-branes,
D4-branes(and anti D4-branes) and O6-plane, of type IIA string theory
corresponding to the meta-stable nonsupersymmetric vacua in four dimensional
N=1 supersymmetric SU(N_c) x SU(N_c') x SU(N_c'') gauge theory with a symmetric
tensor field, a conjugate symmetric tensor field and bifundamental fields. We
also describe the intersecting brane configurations of type IIA string theory
corresponding to the nonsupersymmetric meta-stable vacua in the above gauge
theory with an antisymmetric tensor field, a conjugate symmetric tensor field,
eight fundamental flavors and bifundamentals. These brane configurations
consist of NS-branes, D4-branes(and anti D4-branes), D6-branes and O6-planes.Comment: 34pp, 9 figures; Improved the draft and added some footnotes; Figure
1, footnote 7 and captions of Figures 7,8,9 added or improved and to appear
in CQ
Budget-restricted utility games with ordered strategic decisions
We introduce the concept of budget games. Players choose a set of tasks and
each task has a certain demand on every resource in the game. Each resource has
a budget. If the budget is not enough to satisfy the sum of all demands, it has
to be shared between the tasks. We study strategic budget games, where the
budget is shared proportionally. We also consider a variant in which the order
of the strategic decisions influences the distribution of the budgets. The
complexity of the optimal solution as well as existence, complexity and quality
of equilibria are analyzed. Finally, we show that the time an ordered budget
game needs to convergence towards an equilibrium may be exponential
Muon Spectra of Quasi-Elastic and 1-Pion Production Events in LBL Neutrino Oscillation Experiments
The muon energy spectra of the quasi-elastic and 1-pion production events in
a LBL experiment, like K2K, are predicted to follow closely the neutrino energy
spectrum, with downward shifts of the energy scale by and respectively. These predictions seem to agree with the
observed muon spectra in the K2K nearby detector. The corresponding muon
spectra in the far-away (SK) detector are predicted to show characteristic
spectral distortions induced by oscillation. Comparison of the
predicted spectral distortions with the observed muon spectra of the 1-Ring and
2-Ring muon events in the SK detector will help to determine the oscillation
parameters. The results will be applicable to other LBL experiments as well.Comment: 13 pages. One figure and a few comments added, final version to
appear in P
Brane Configurations for Nonsupersymmetric Meta-Stable Vacua in SQCD with Adjoint Matter
We present the configurations of intersecting branes in type IIA string
theory corresponding to the meta-stable supersymmetry breaking
vacua(hep-th/0608063) in the four-dimensional N=1 supersymmetric Yang-Mills
theory coupled massive flavors with adjoint matter where the superpotential has
three deformed terms.Comment: 15pp, 3 figures; The last two sentences in page 7 corrected; The last
figure added;improved pages 10 and 11;figures corrected;the references to
colors improved in the text and to appear in CQ
Generation of Transgenic Tall Fescue Plants with Enhanced Abiotic Stress Tolerance
Environmental stresses, such as drought, salinity and temperature extremes significantly decrease the yield of forage crops. Therefore, traits associated with abiotic stress-tolerance are of prime importance for their improvement. Biotechnological approaches have the potential to accelerate and complement conventional breeding by extending the range of gene sources for valuable traits, thus offering new opportunities for forage improvement. Transgenic technology appears as an efficient biotechnological tool of molecular breeding for improving forage quality and yield as well as tolerance to various environmental stresses. Occurrence of high level of reactive oxygen species (ROS) is a common phenomenon in abiotic stress-challenged plants. Plants have been evolved with a number of protective mechanisms to counteract such oxidative stress. Molecular chaperones play crucial roles against oxidative stress. Heat shock proteins (HSPs) are molecular chaperones that provide thermotolerance in plants (Heckathorn et al. 1998). It has been reported that chloroplast-localized small HSPs protect thermolabile photosystem II (PSII) in isolated chloroplasts in vitro and are important for heat acclimation (Heckathorn et al. 1998). A number of previous reports have demonstrated that ABA is essential for the adaptive response to drought stress (Xiong et al. 2002). ABA-responsive elements (ABRE)-binding bZIP proteins (ABFs) have been isolated (Choi et al. 2000) and mediate ABA-dependent stress signaling in Arabidopsis (Uno et al. 2000). Overexpression of ABF increased tolerance to drought or heat stress (Vanjildorj et al. 2006). In this project, we generated transgenic tall fescue plants over-expressing chloroplastic small HSP or ABF, and investigated their performance under abiotic stresses
The black hole final state for the Dirac fields In Schwarzschild spacetime
We show that the internal stationary state of a black hole for massless Dirac
fields can be represented by an entangled state of collapsing matter and
infalling Hawking radiation. This implies that the Horowitz-Maldacena
conjecture for the black hole final state originally proposed for the massless
scalar fields is also applicable to fermionic fields as well. For an initially
mixed state we find that the measure of mixedness is expected to decrease under
evaporation
Meat Products Manufactured with Olive Oil
Consumer perception of processed meat products is a critical issue for the meat industry. In recent years consumers are increasingly conscious about healthy diet. However, most of the processed meat products contain high amounts of fat, which are related to chronic diseases such as obesity and cardiovascular heart diseases. Health organizations have suggested to reduce the intake of total dietary fat, particularly saturated fatty acids and cholesterol, as a mean to prevent cardiovascular heart diseases (NCEP, 1988). Consumers now want low or reduced-animal fat products with high palatability and nutritional quality (Pietrasik & Duda, 2000)
Measurements and ab initio Molecular Dynamics Simulations of the High Temperature Ferroelectric Transition in Hexagonal RMnO3
Measurements of the structure of hexagonal RMnO3 (R=rare earths (Ho) and Y)
for temperatures significantly above the ferroelectric transition temperature
(TFE) were conducted to determine the nature of the transition. The local and
long range structural measurements were complemented by ab initio molecular
dynamics simulations. With respect to the Mn sites in YMnO3 and HoMnO3, we find
no large atomic (bond distances or thermal factors), electronic structure
changes or rehybridization on crossing TFE from local structural methods. The
local symmetry about the Mn sites is preserved. With respect to the local
structure about the Ho sites, a reduction of the average Ho-O bond with
increased temperature is found. Ab initio molecular dynamics calculations on
HoMnO3 reveal the detailed motions of all ions. Above ~900 K there are large
displacements of the Ho, O3 and O4 ions along the z-axis which reduce the
buckling of the MnO3/O4 planes. The changes result in O3/O4 ions moving to
towards central points between pairs of Ho ions on the z-axis. These structural
changes make the coordination of Ho sites more symmetric thus extinguishing the
electric polarization. At significantly higher temperatures, rotation of the
MnO5 polyhedra occurs without a significant change in electric polarization.
The born effective charge tensor is found to be highly anisotropic at the O
sites but does not change appreciably at high temperatures
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