9,234 research outputs found
The Williams Conjecture is false for irreducible subshifts
We show the Williams Conjecture is false for irreducible shifts of finite
type by examining relative sign-gyration numbers of conjugacies between shifts
with no points of period one or two.Comment: 14 pages, published versio
Aqueous Phase C-H Bond Oxidation Reaction of Arylalkanes Catalyzed by a Water-Soluble Cationic Ru(III) Complex [(pymox-Me\u3csub\u3e2\u3c/sub\u3e)\u3csub\u3e2\u3c/sub\u3eRuCl\u3csub\u3e2\u3c/sub\u3e]\u3csup\u3e+\u3c/sup\u3eBF\u3csub\u3e4\u3c/sub\u3e\u3csup\u3e-\u3c/sup\u3e
The cationic complex [(pymox-Me2)RuCl2]+BF4− was found to be a highly effective catalyst for the C−H bond oxidation reaction of arylalkanes in water. For example, the treatment of ethylbenzene (1.0 mmol) with t-BuOOH (3.0 mmol) and 1.0 mol % of the Ru catalyst in water (3 mL) cleanly produced PhCOCH3 at room temperature. Both a large kinetic isotope effect (kH/kD = 14) and a relatively large Hammett value (ρ = −1.1) suggest a solvent-caged oxygen rebounding mechanism via a Ru(IV)-oxo intermediate species
The muon g-2 discrepancy: errors or new physics?
After a brief review of the muon g-2 status, we discuss hypothetical errors
in the Standard Model prediction that could explain the present discrepancy
with the experimental value. None of them looks likely. In particular, an
hypothetical increase of the hadroproduction cross section in low-energy e^+e^-
collisions could bridge the muon g-2 discrepancy, but is shown to be unlikely
in view of current experimental error estimates. If, nonetheless, this turns
out to be the explanation of the discrepancy, then the 95% CL upper bound on
the Higgs boson mass is reduced to about 130 GeV which, in conjunction with the
experimental 114.4 GeV 95% CL lower bound, leaves a narrow window for the mass
of this fundamental particle.Comment: 4 pages. Invited talk at 16th International Conference on
Supersymmetry and the Unification of Fundamental Interactions (SUSY08), June
16-21 2008, Seoul, Kore
Axial charges of octet and decuplet baryons
We present a study of axial charges of baryon ground and resonant states with
relativistic constituent quark models. In particular, the axial charges of
octet and decuplet , , , , , and
baryons are considered. The theoretical predictions are compared to existing
experimental data and results from other approaches, notably from lattice
quantum chromodynamics and chiral perturbation theory. The relevance of axial
charges with regard to -dressing and spontaneous chiral-symmetry breaking
is discussed
Dependence of quantum-Hall conductance on the edge-state equilibration position in a bipolar graphene sheet
By using four-terminal configurations, we investigated the dependence of
longitudinal and diagonal resistances of a graphene p-n interface on the
quantum-Hall edge-state equilibration position. The resistance of a p-n device
in our four-terminal scheme is asymmetric with respect to the zero point where
the filling factor () of the entire graphene vanishes. This resistance
asymmetry is caused by the chiral-direction-dependent change of the
equilibration position and leads to a deeper insight into the equilibration
process of the quantum-Hall edge states in a bipolar graphene system.Comment: 5 pages, 4 figures, will be published in PR
Korean value systems and managerial practices
Human beings are by nature sociocultural creatures. Our behavior is influenced not only by traditional value systems but also by contemporary education and training. In the same manner, the managerial practices of Korean managers are strongly influenced by the norms and value systems of the traditional Korean society. But, as the society changes from an agrarian society to an industrialized one, so does the behavior of Korean managers. This chapter focuses on the process of this change. More specifically, it will look at the effects of traditional value systems and those of industrialization on Korean managerial practices
Deconfined quantum criticality in the two dimensional Kondo lattice model
We investigate the continuous quantum phase transition from an
antiferromagnetic metal to a heavy fermion liquid based on the Kondo lattice
model in two dimensions. We propose that antiferromagnetic spin fluctuations
and conduction electrons fractionalize into neutral bosonic spinons and charged
spinless fermions at the quantum critical point. This deconfined quantum
criticality leads us to establish a critical field theory in terms of the
fractionalized fields interacting via emergent U(1) gauge fields. The critical
field theory not only predicts non-Fermi liquid physics near the quantum
critical point but also recovers Fermi liquid physics away from the quantum
critical point
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