1,859 research outputs found
British literature since World War II : a selected bibliography of secondary sources with special reference to drama/theatre and narrative prose (period covered : mid-1940 to 2000)
British literature since world war II : a selected bibliography of secundary sources with special reference to drama/theatre and narrative prose (period covered : mid-1940 to 2000). Part I: Integrated alphabetical index. Part II: Specific bibliographies (as to author and subject
Strange magnetic moment of the nucleon and SU(3) breaking: group theoretical approach
An extended group-theoretical approach to magnetic moments of the octet
baryons is proposed with the aim of extracting the strange magnetic moment of
the nucleon. Special attention is given to flavor SU(3) breaking. In this
approach, isoscalar and isovector magnetic moments are treated separately in
view of their different behavior under SU(3) breaking. We conclude that the
anomalous magnetic moment associated with the flavor singlet current is small.
Together with the small isoscalar anomalous magnetic moment of the nucleon,
this implies suppression of the strange magnetic moment of the proton which is
found to be small and positive, mu^(s) = (0.16 \pm 0.03) mu_N in units of the
nuclear magneton.Comment: 6 pages, no figure, 6 tables, use REVTeX
Extensions and further applications of the nonlocal Polyakov--Nambu--Jona-Lasinio model
The nonlocal Polyakov-loop-extended Nambu--Jona-Lasinio (PNJL) model is
further improved by including momentum-dependent wave-function renormalization
in the quark quasiparticle propagator. Both two- and three-flavor versions of
this improved PNJL model are discussed, the latter with inclusion of the
(nonlocal) 't Hooft-Kobayashi-Maskawa determinant interaction in order to
account for the axial U(1) anomaly. Thermodynamics and phases are investigated
and compared with recent lattice-QCD results.Comment: 28 pages, 11 figures, 4 tables; minor changes compared to v1;
extended conclusion
Chiral pion-nucleon dynamics in finite nuclei: spin-isospin excitations
The nuclear density functional framework, based on chiral dynamics and the
symmetry breaking pattern of low-energy QCD, is extended to the description of
collective nuclear excitations. Starting from the relativistic point-coupling
Lagrangian previously introduced [Nucl. Phys. A770 (2006) 1], the
proton-neutron (quasiparticle) random phase approximation is formulated and
applied to investigate the role of chiral pion-nucleon dynamics in excitation
modes involving spin and isospin degrees of freedom, e.g. isobaric analog
states and Gamow-Teller resonances.Comment: 17 pages, 6 figures, elsart class. Minor revisions, Nuclear Physics A
in prin
Developing brokered community transportation for seniors and people with disabilities
Communities are exploring ways to increase transportation coordination to improve access for seniors. One such effort is a brokered transportation system in which one agency serves as the central point of contact for ride information or actually arranging transportation for clients of multiple programs by use of a combination of transportation services. A team of social work faculty and students from the University of New Hampshire (UNH) Social Work Outreach Center, a center that provides service learning opportunities to students, collaborated with a local coalition to investigate the specific transportation needs of the region\u27s senior citizens. A total of 641 people participated in the survey. Results indicate that the study population experiences problems reliably meeting daily living needs due to inconsistent or unavailable private and public transportation options. Study findings also indicate the promising potential of brokered transportation systems, particularly for isolated seniors in rural and suburban areas with relatively limited public and private transportation options
Multi- nuclei and kaon condensation
We extend previous relativistic mean-field (RMF) calculations of multi- nuclei, using vector boson fields with SU(3) PPV coupling constants and
scalar boson fields constrained phenomenologically. For a given core nucleus,
the resulting separation energy , as well as the
associated nuclear and -meson densities, saturate with the number
of mesons for . Saturation
appears robust against a wide range of variations, including the RMF nuclear
model used and the type of boson fields mediating the strong interactions.
Because generally does not exceed 200 MeV, it is argued that
multi- nuclei do not compete with multihyperonic nuclei in providing
the ground state of strange hadronic configurations and that kaon condensation
is unlikely to occur in strong-interaction self-bound strange hadronic matter.
Last, we explore possibly self-bound strange systems made of neutrons and
mesons, or protons and mesons, and study their properties.Comment: 21 pages, 8 figures, revised text and reference
Chiral Dynamics of Deeply Bound Pionic Atoms
We present and discuss a systematic calculation, based on two-loop chiral
perturbation theory, of the pion-nuclear s-wave optical potential. A proper
treatment of the explicit energy dependence of the off-shell pion self-energy
together with (electromagnetic) gauge invariance of the Klein-Gordon equation
turns out to be crucial. Accurate data for the binding energies and widths of
the 1s and 2p levels in pionic ^{205}Pb and ^{207}Pb are well reproduced, and
the notorious "missing repulsion" in the pion-nuclear s-wave optical potential
is accounted for. The connection with the in-medium change of the pion decay
constant is clarified.Comment: preprint ECT*-02-16, 4 pages, 3 figure
An Introduction And Case History Review Of Active Magnetic Bearings.
LecturePg. 121-126The concept of magnetic levitation is not a new one and can be easily traced back to the 1800s [1). It is only recently, however, that the congruous technologies of electronic control systems, power electronics, and magnetic materials have begun to merge to make the magnetic suspension device a viable product. A brief overview is presented of an active magnetic bearing technology [2]. The required systems engineering interface with the machine designer is discussed. Finally, case histories of various turbomachinery in North America presently operating on magnetic bearings are reviewed
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