975 research outputs found
Invisibly decaying Higgs boson in the Littlest Higgs model with T-parity
We show that there are regions in the parameter space of the Littlest Higgs
model with T-parity, allowed by electroweak precision data, where the Higgs
boson can decay invisibly into a pair of heavy photons A_H with a substantial
branching ratio. For a symmetry breaking scale f in the range 450-600 GeV, the
BR(H -> A_H A_H) can be up to 95% for an intermediate mass Higgs, and from 20%
down to a few percents for a Higgs boson of mass 200 GeV or above. The total
decay width of the Higgs boson can thereby be enhanced by an order of magnitude
compared to the Standard Model for Higgs masses around 130 GeV.Comment: 4 pages, 2 figures, Latex (stylefiles included); Talk presented by
A.N. at the International Workshop on Theoretical High Energy Physics (IWTHEP
2007), Roorkee, India, 15-20 March 2007, to appear in the proceeding
Optimizing the discrete time quantum walk using a SU(2) coin
We present a generalized version of the discrete time quantum walk, using the
SU(2) operation as the quantum coin. By varying the coin parameters, the
quantum walk can be optimized for maximum variance subject to the functional
form and the probability distribution in the position
space can be biased. We also discuss the variation in measurement entropy with
the variation of the parameters in the SU(2) coin. Exploiting this we show how
quantum walk can be optimized for improving mixing time in an -cycle and for
quantum walk search.Comment: 6 pages, 6 figure
Prospecting for scarabid specific Bacillus thuringiensis crystal toxin cry8 gene in sugarcane ecosystem of Tamil Nadu, India
In the present study, we report the occurrence of cry8 positive isolates of Bacillus thuringiensis (Bt) in selected white grub, Holotrichia serrata F. (Coleoptera: Scarabaeidae), endemic soils of sugarcane ecosystem and other places in Tamil Nadu. Out of the 66 soil samples collected and screened for white grub specific Bt, 74 isolates of the bacterium, all containing only spherical crystal toxin, were identified. PCR screening of these isolates with cry8 gene universal primer revealed six isolates to be positive. Further, the amplicon of a 370 bp band, amplified with another set of degenerate primer designed based on the conserved sequence of cry8 genes, was sequenced from four isolates. Multiple sequence alignment revealed the gene sequences to be the same for all the isolates. The present report of the availability of cry8 positive Bt isolates opens the avenue for controlling white grubs through transgenic research
Critical age-dependent branching Markov processes and their scaling limits
This paper studies: (i) the long-time behaviour of the empirical distribution of age and normalized position of an age-dependent critical branching Markov process conditioned on non-extinction; and (ii) the super-process limit of a sequence of age dependent critical branching Brownian motions
High Frobenius pushforwards generate the bounded derived category
This work concerns generators for the bounded derived category of coherent
sheaves over a noetherian scheme of prime characteristic. The main result
is that when the Frobenius map on is finite, for any compact generator
of the Frobenius pushforward generates the bounded
derived category for whenever is larger than the codepth of , an
invariant that is a measure of the singularity of . The conclusion holds for
all positive integers when is locally complete intersection. The
question of when one can take is also investigated. For
smooth projective complete intersections reduces to a question of generation of
the Kuznetsov component.Comment: 31 page
Effect Of Nanoclay On The Toughness Of Epoxy And Mechanical, Impact Properties Of E-glass-epoxy Composites
Organically modified montimorillonite nanoclay was added to the epoxy and E-glass-epoxy composites. The influence of nanoclay content (varied between 0 to 5wt %) on the relative crosslink density and the fracture toughness of the epoxy matrix was studied. Differential scanning calorimetry (DSC) indicated that the amino functional groups present on the nanoclay react with the epoxy matrix to increase the crosslink density of about 13 and 18% at 3 and 5wt% addition, respectively. The toughness of the epoxy composites increased by 25% at 3wt% addition of nanoclay, whereas, it decreases at 5wt%. Flexural strength and tensile strength of the E-glass-epoxy composites were found to increase by 12% and 11% respectively at 3wt% addition of nanoclay, while at 5wt% addition these properties decreased due to the matrix embrittlement. Interestingly matrix embrittlement is found to be beneficial in increasing the impact resistance due to spallation of embrittled matrix that ensures the dissipation of the impact energy. 5wt% nanoclay addition increases the impact strength by 29% and reduces the back face bulge of composite by 31%. These results may lead to the design and realization of glass-epoxy composites with better impact strength
Evaluation of configurational entropy of a model liquid from computer simulations
Computer simulations have been employed in recent years to evaluate the
configurational entropy changes in model glass-forming liquids. We consider two
methods, both of which involve the calculation of the `intra-basin' entropy as
a means for obtaining the configurational entropy. The first method involves
the evaluation of the intra-basin entropy from the vibrational frequencies of
inherent structures, by making a harmonic approximation of the local potential
energy topography. The second method employs simulations that confine the
liquid within a localized region of configuration space by the imposition of
constraints; apart from the choice of the constraints, no further assumptions
are made. We compare the configurational entropies estimated for a model liquid
(binary mixture of particles interacting {\it via} the Lennard-Jones potential)
for a range of temperatures, at fixed density.Comment: 10 pages, 5 figures, Proceedings of "Unifying Concepts in Glass
Physics" Trieste 1999 (to appear in J. Phys. Cond. Mat.
Evaluation of Anti-Factor Xa Level Usage for Low Molecular Weight Heparin in a Healthcare System
Background: Low-molecular-weight heparin (LMWH) is a commonly used anticoagulant for treatment of venous thromboembolism (VTE). Routine monitoring of therapeutic effects through anti-Xa levels is not recommended but may be beneficial in patients with altered pharmacokinetics.1,2 Inappropriate monitoring leads to excessive testing and premature dose adjustments, compromising safety and efficacy. The purpose of this project was to assess appropriateness of monitoring LMWH anti-Xa levels and identify opportunities to optimize utilization within a community health system.
Methods: A random-sample, retrospective chart review at a multi-site hospital system was conducted over a 3-year period. Inclusion criteria were adults admitted with at least one anti-Xa level resulted. Primary outcomes consisted of anti-Xa level indication and corresponding dose adjustments. Secondary outcomes included anti-Xa levels ordered at the appropriate time window and incidence of adverse events after dose adjustments.
Results: Only 28% (61/220) of patients reviewed had an appropriate indication for LMWH anti-Xa level monitoring. Of the 49 patients warranting dose adjustments, 92% received appropriate adjustments. Anti-Xa levels were drawn after the third therapeutic dose in 146 patients with 84 drawn 3-5 hours post-dose. Four patients had documentation of bleeding and 1 patient had thrombosis following inappropriate dose adjustments, compared to no reported events following appropriate adjustments.
Conclusion: Appropriate LMWH anti-Xa monitoring in patients with altered pharmacokinetics resulted in justified dose adjustments and ensured therapeutic concentrations were attained. In patients with appropriate monitoring and dose adjustments, no adverse events were noted. The results of this project will be reviewed utilizing a multi-disciplinary approach to develop a LMWH anti-Xa level monitoring protoco
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