2,384,877 research outputs found
Large Nc means Nc=3
We show that the nonperturbative solution of the SU(2) linear sigma model
field theory requires color number Nc=3. Also, we show that the three-point and
four-point functions bootstrap (or nonperturbatively ``shrink'') in the chiral
limit to the tree amplitudes. Independently, we show that a chiral phase
transition for Nf=2 requires Tc=180 MeV, consistent with the computer lattice
value (173 +/- 8 MeV).Comment: 9 pages, LaTeX. Invited talk given at the Large Nc Workshop, ASU,
January 200
NC Calabi-Yau Manifolds in Toric Varieties with NC Torus fibration
Using the algebraic geometry method of Berenstein and Leigh (BL),
hep-th/0009209 and hep-th/0105229), and considering singular toric varieties
with NC irrational torus fibration, we construct NC extensions
of complex d dimension Calabi-Yau (CY) manifolds embedded
in . We give realizations of the NC toric group, derive the constraint eqs for NC Calabi-Yau (NCCY) manifolds
embedded in and work out solutions for
their generators. We study fractional branes at singularities and show
that, due to the complete reducibility property of group
representations, there is an infinite number of non compact fractional branes
at fixed points of the NC toric group.Comment: 12 pages, LaTex, no figur
Regenerative and Adaptive schemes Based on Network Coding for Wireless Relay Network
Recent technological advances in wireless communications offer new
opportunities and challenges for relay network.To enhance system performance,
Demodulate-Network Coding (Dm-NC) scheme has been examined at relay node; it
works directly to De-map the received signals and after that forward the
mixture to the destination. Simulation analysis has been proven that the
performance of Dm-NC has superiority over analog-NC. In addition, the
Quantize-Decode-NC scheme (QDF-NC) has been introduced. The presented
simulation results clearly provide that the QDF-NC perform better than
analog-NC. The toggle between analogNC and QDF-NC is simulated in order to
investigate delay and power consumption reduction at relay node.Comment: 11 pages, 8 figures, International Journal of Computer Networks &
Communications (IJCNC), Vol.4, No.3, May 201
Toric Varieties with NC Toric Actions: NC Type IIA Geometry
Extending the usual actions of toric manifolds by
allowing asymmetries between the various factors, we build
a class of non commutative (NC) toric varieties . We
construct NC complex dimension Calabi-Yau manifolds embedded in
by using the algebraic geometry method. Realizations
of NC toric group are given in presence and absence of
quantum symmetries and for both cases of discrete or continuous spectrums. We
also derive the constraint eqs for NC Calabi-Yau backgrounds
embedded in and work out their
solutions. The latters depend on the Calabi-Yau condition , being the charges of % ;
but also on the toric data of the polygons associated to . Moreover,
we study fractional branes at singularities and show that, due to the
complete reducibility property of group representations,
there is an infinite number of fractional branes. We also give the
generalized Berenstein and Leigh quiver diagrams for discrete and continuous
representation spectrums. An illustrating example is
presented.Comment: 25 pages, no figure
Characterisation of the first authenticated organomercury hydroxide, 4-MeâNCâHâHgOH
4-MeâNCâHâHgOH was prepared from 4-MeâNCâHâHgOAc. Full characterisation showed that it crystallises as discrete molecules, the first example of a true organomercury hydroxide in the solid state. The structures of 4-MeâNCâHâHgOAc and (4-MeâNCâHâ)âHg are also discussed.
4-MeâNCâHâHgOH has been characterised spectroscopically and crystallographically as a true organomercury hydroxide
Development of STEP-NC based machining system for machining process information flow
To realize the STEP-NC based machining system, it is necessary to perform machining feature extraction, generating machine-specific information, and creating a relationship between STEP-NC entities. A process planning system of a STEP-NC information flow that starts with constructing a machining feature from a CAD model will be developed. In this paper, a further in depth study of the implementation and adaptation of STEP-NC in manufacturing is studied. This study will help to understand how the data from CAD/CAM can be converted into STEP-NC codes and the machining process will be based on the STEP-NC codes generated
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