2,904 research outputs found
StreamAR: incremental and active learning with evolving sensory data for activity recognition
Single and Pair Production of Doubly Charged Higgs Bosons at Hadron Colliders
Current searches for doubly charged Higgs bosons (H^{\pm\pm}) at the Fermilab
Tevatron are sensitive to single production of H^{\pm\pm}, although the pair
production mechanism q\bar q\to H^{++}H^{--} is assumed to be dominant. In the
context of a Higgs Triplet Model we study the mechanism q'\bar q\to
H^{\pm\pm}H^{\mp} at the Tevatron and CERN Large Hadron Collider, and show that
its inclusion can significantly improve the search potential for H^{\pm\pm}.
Moreover, assuming that the neutrino mass is generated solely by the triplet
field Yukawa coupling to leptons, we compare the branching ratios of
H^{\pm\pm}\to l^\pm l^\pm and H^{\pm\pm}\to H^\pm W^* for the cases of a normal
hierarchical, inverted hierarchical and degenerate neutrino mass spectrum.Comment: 17 pages, 15 figures, references added, version to appear in PR
Discrimination of SUSY breaking models using single-photon processes at future e+e- linear colliders
We examine the single-photon processes in the frame work of supersymmetric
models at future e+e- linear colliders. According to the recent experimental
achievement, the optimistic polarization degrees for both electron and positron
beams are taken into account to enhance the signal-to-noise ratio revealing the
observable difference between supersymmetry breaking models. The minimal
supergravity model and the minimal SU(5) grand unified model in gaugino
mediation have been examined as examples. We see that after several years of
accummulating data, the difference of the number of single-photon events
between the two models received from the collider would be in excess of three
times the statistical error, providing us the possibility to probe which model
would be realized in nature. The result is well suitable for the future running
of the International Linear Collider.Comment: 14 pages, 4 figures, version to be published in Mod. Phys. Lett.
Fifteen years experience: Egyptian metabolic lab
Background: Inborn errors of metabolism (IEM) are single gene disorders responsible for abnormalities in the synthesis or catabolism of proteins, carbohydrates and fats by means of defective enzymes or transport proteins which results in a block of the metabolic pathway and accumulation of metabolites in different tissues. This study shows the most common diagnosed inherited inborn errors of metabolism among the Egyptian population. Prior to 1995, the diagnosis of inherited metabolic disorders in Egypt was very limited and diagnosed mainly on clinical suspicion. In 1995, The Biochemical Genetics Unit at The National Research Centre has been established as a part of The Human Genetics Department and later on in 2003 it was developed into The Biochemical Genetics Department by applying advanced techniques and equipments and providing early diagnosis for the metabolic disorders which led to better outcome in our patients. Material and methods: We have retrospectively reviewed a total of 12,148 cases suspected to have inborn errors of metabolism (IEM) with different age groups. They had been referred from several diagnostic centers and hospitals in Egypt to The Department of Biochemical Genetics at The National Research Centre. The diagnosis of these disorders was confirmed by qualitative determination of amino acid profile, quantitative determination of phenylalanine and galactose levels using dried blood spots (DBSs), quantitative determination of urinary glycosaminoglycans (GAGs), twodimensional electrophoretic separation of GAGs in urine and the assay for lysosomal enzymes activities in plasma and leukocytes. Results: Out of the total number of cases; 1041 (8.6%) patients were proved to have metabolic disorders. Those patients were classified as: 722 patients (69.4%) with lysosomal storage disorders, 302 patients (29%) with amino acid disorders and 17 patients (1.6%) with galactosemia. Conclusion: This study illustrates the experience of the reference metabolic lab in Egypt over 15 years. The lab began metabolic disorder screening by using simple diagnostic techniques like thin layer chromatography and colored tests in urine which by time updated and upgraded the methods to diagnose a wide range of disorders. This study shows the most common diagnosed inherited inborn errors of metabolism among the Egyptian population.Keywords: IEM; Consanguineous marriages; Aminoacidopathies; Lysosomal storage disorder
Editorial: The oral-gut axis: from ectopic colonization to within-host evolution of oral bacteria
Low-temperature rate constants for rotational excitation and de-excitation of C3 (X 1âg +) by collisions with He (1S)
The low-temperature rotational (de-) excitation of C3 (X 1âg 1) by collisions with He (1S) is studied using an ab initio potential energy surface (PES). This PES has been calculated using the single- and double-excitation coupled-cluster approach with noniterative perturbational treatment of triple excitations [CCSD(T)] and the augmented correlation-consistent triple-ζ basis set (aug-cc-pVTZ) with bond functions. This PES is then incorporated in full close-coupling quantum scattering calculations for collision energies between 0.1 and 50 cm -1 in order to deduce the rate constants for rotational levels of C3 up to j = 10, covering the temperature range 5-15 K. © 2008. The American Astronomical Society. All rights reserved.The Agencia Española de CooperaciĂłn Internacional (project A/8083/07, CSIC-UniversitĂ© Tunis El Manar) and the Spanish Ministerio de EducaciĂłn y Ciencia (project AYA 2005-00702) are thanked for ïŹnancial supportPeer Reviewe
Comparison of the subspecies of Sclerocarya birreaby sex and environment
A comparison of stand parameters between wild and on farm populations of the 3 subspecies of Sclerocarya birrea was done. Using plot-less sampling technique, 100 trees from six populations were measured for diameter at breast height (Dbh), branching height, height and crown diameter. There was significant (p<0.001) difference in Dbh, branching height and tree height between the three subspecies and between the populations. For all subspecies and populations, male trees were taller than female trees although the difference was not significant. While S. birrea subspecies birrea and caffra had trees in the wild taller than those on farm, the opposite was observed among trees of S. birrea subspecies multifoliolata. The mean crown sizes of male and female trees differed significantly (p<0.001) between the three subspecies and within a population. There were positive correlations (p> 50) between altitude and tree diameter, branching height, tree-height and crown diameter. Tree size was not found to increase due to farmersâ selection pressure and farming practices in Tanzania, probably because they are not retained purposely for their fruits as is the case in other countries in southern Africa.Key words: Sclerocarya birrea, Tanzania, population, habitat, gende
ALEPH Tau Spectral Functions and QCD
Hadronic decays provide a clean laboratory for the precise study of
quantum chromodynamics (QCD). Observables based on the spectral functions of
hadronic decays can be related to QCD quark-level calculations to
determine fundamental quantities like the strong coupling constant, quark and
gluon condensates. Using the ALEPH spectral functions and branching ratios,
complemented by some other available measurements, and a revisited analysis of
the theoretical framework, the value \asm = 0.345 \pm 0.004_{\rm exp} \pm
0.009_{\rm th} is obtained. Taken together with the determination of \asZ from
the global electroweak fit, this result leads to the most accurate test of
asymptotic freedom: the value of the logarithmic slope of is
found to agree with QCD at a precision of 4%. The value of \asZ obtained from
decays is \asZ = 0.1215 \pm 0.0004_{\rm exp} \pm 0.0010_{\rm th} \pm
0.0005_{\rm evol}
= 0.1215 \pm 0.0012.Comment: 14 pages, 5 figures, invited talk at the Tau06 International
Workshop, Pisa, September 19-22 200
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