859 research outputs found
The dromedary camel; a review on the aspects of history, physical description, adaptations, behavior/lifecycle, diet, reproduction, uses, genetics and diseases
Some aspects of the life of the dromedary camel were examined based on available literature. The camel was said to be domesticated in the present day Oman about 4000 yrs ago. Two dominant species where named, the Camelus dromedary and Camelus bacterainus. Its name the “ship of the desert” was said to be given because of its usefulness to the desert nomads to whom the camel serves as beast of burden, draft animal and also a source of milk, meat, hides, hair and wool. Their ability to stay for long periods without water is one of the characteristics that make the camel of great importance due to the emergence of environmental challenges such as desert encroachment and global warming. The fast developing sport of camel racing has the potential of becoming an industry that will further enrich the economy and promote tourism in some Arab countries. The camel is also known to be susceptible to diseases like antrax, surra, helminthosis, salmonellosis, brucellosis, tuberculosis, pasturellosis, paratuberculosis, black quarter, pneumonia, and tetanus.Keywords: Camel, dromedary, origin, genus, uses, product
Mixed Gauge and Anomaly Mediation From New Physics at 10 TeV
In the context of anomaly-mediated supersymmetry breaking, it is natural for
vectorlike fields and singlets to have supersymmetry breaking masses of order
10 TeV, and therefore act as messengers of supersymmetry breaking. We show that
this can give rise to phenomenologically viable spectra compatible with
perturbative gauge coupling unification. The minimal model interpolates
continuously between pure anomaly mediation and gauge mediation with a
messenger scale of order 10 TeV. It is also possible to have non-minimal models
with more degenerate specta, with some squarks lighter than sleptons. These
models reduce to the MSSM at low energies and incorporate a natural solution of
the mu problem. The minimal model has four continuous parameters and one
discrete parameter (the number of messengers). The LEP Higgs mass bound can be
satisfied in the minimal model by tuning parameters at the GUT scale to one
part in 50.Comment: 17 pages, 4 figure
Suppressed supersymmetry breaking terms in the Higgs sector
We study the little hierarchy between mass parameters in the Higgs sector and
other SUSY breaking masses. This type of spectrum can relieve the fine-tuning
problem in the MSSM Higgs sector. Our scenario can be realized by
superconformal dynamics. The spectrum in our scenario has significant
implications in other phenomenological aspects like the relic abundance of the
lightest neutralino and relaxation of the unbounded-from-below constraints.Comment: 14 pages, late
Supersymmetric Models With Tan(beta) Close to Unity
Within the framework of supersymmetric grand unification, estimates of the
quark mass based on the asymptotic relation single out
the region with close to unity, particularly if . We explore the radiative breaking of the
electroweak symmetry and the associated sparticle and higgs spectroscopy in
models with . The lightest scalar higgs
is expected to have a mass below , while the remaining four higgs
masses exceed . The lower bounds on some of the sparticle masses are
within the range of LEP 200.Comment: 13 pages in plain LaTeX, BA-94-02, 15 figures (available on request
Implications of a charged-current anomaly at HERA
We demonstrate that in the presence of mixing between different scalar
leptoquark multiplets it is possible to simultaneously account for the HERA
high- neutral current anomaly, and produce a charged current anomaly of
comparable magnitude. The reduced branching ratio to electrons and jets of the
lightest leptoquark state results in a significant weakening of the CDF/D0
limits on scalar leptoquarks; masses consistent with the HERA neutral current
excess are comfortably within the allowed range. We show that the possibilities
for such a successful mixed leptoquark scenario are quite limited, and we
investigate some aspects of their phenomenology.Comment: 10 pages Latex. Corrected 3-body decay width
Flavor Alignment Solutions to the Strong CP Problem in Supersymmetry
An approach to solving the Strong CP Problem in supersymmetric theories is
discussed which uses abelian family symmetries to align the mass matrices of
the quarks and squarks. In this way both the Strong CP Problem and the
characteristic flavor and CP problems of supersymmetry can be solved in a
single way.Comment: 13 pages, LaTe
Simultaneous Diagonal and Off Diagonal Order in the Bose--Hubbard Hamiltonian
The Bose-Hubbard model exhibits a rich phase diagram consisting both of
insulating regimes where diagonal long range (solid) order dominates as well as
conducting regimes where off diagonal long range order (superfluidity) is
present. In this paper we describe the results of Quantum Monte Carlo
calculations of the phase diagram, both for the hard and soft core cases, with
a particular focus on the possibility of simultaneous superfluid and solid
order. We also discuss the appearance of phase separation in the model. The
simulations are compared with analytic calculations of the phase diagram and
spin wave dispersion.Comment: 28 pages plus 24 figures, uuencoded Revtex+postscript file
Evidence for hadronic deconfinement in -p collisions at 1.8 TeV
We have measured deconfined hadronic volumes, fm,
produced by a one dimensional (1D) expansion. These volumes are directly
proportional to the charged particle pseudorapidity densities . The hadronization temperature is (syst)
MeV. Using Bjorken's 1D model,the hadronization energy density is (stat) GeV/fm corresponding to an excitation of (stat) quark-gluon degrees of freedom.Comment: 15 pages, 3 figures, 2 table
Contact Interactions Involving Right-handed Neutrinos and SN1987A
We consider lepton-quark contact interactions in models with right-handed
neutrinos, and find that observational data from SN1987A restricts the scale of
such interactions to be at least TeV.Comment: 7 pages, latex, no figures. Minor corrections to match final version
to appear in Phys. Rev.
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