Leading nucleon and inelasticity in hadron-nucleus interactions

We present in this paper a calculation of the average proton-nucleus ine- lasticity. Using an Iterative Leading Particle Model and the Glauber model, we relate the leading particle distribution in nucleon-nucleus interactions with the respective one in nucleon-proton collisions. To describe the leading particle distribution in nucleon-proton collisions, we use the Regge-Mueller formalism. To appear in Journal of Physics G.Comment: 11 pages, 2 figure

Composition of Primary Cosmic Rays Beyond the ``Knee''from Emulsion Chamber Observations

We show that the simplest assumptions for the dynamics of particle production allow us to understand the fluxes of hadrons and photons at mountain altitudes as well as the structure of individual events. The analysis requires a heavy nuclear component of primary cosmic rays above the ``knee" in the spectrum with average mass number $= 7.3 \pm 0.9$.Comment: Revtex, 11 pages, 5 postscript figures ("\special" command used to embed figures at end of tex file). Compressed postscript version also available at http://phenom.physics.wisc.edu/pub/preprints/1996/madph-96-932.ps.Z or ftp://phenom.physics.wisc.edu/pub/preprints/1996/madph-96-932.ps.

Diffractive Contribution to the Elasticity and the Nucleonic Flux in the Atmosphere

We calculate the average elasticity considering non-diffractive and single diffractive interactions and perform an analysis of the cosmic-ray flux by means of an analytical solution for the nucleonic diffusion equation. We show that the diffractive contribution is important for the adequate description of the nucleonic and hadronic fluxes in the atmosphere.Comment: 10 pages, latex, 2 figures (uuencoded PostScript

Design principles for competence-based recommender systems

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Composition Of Primary Cosmic Rays Beyond The "knee" From Emulsion Chamber Observations

We show that the simplest assumptions for the dynamics of particle production allow us to understand the fluxes of hadrons and photons at mountain altitudes as well as the structure of individual events. The analysis requires a heavy nuclear component of primary cosmic rays above the "knee" in the spectrum with an average mass number (A)=7.3±0.9.54955585562Shibata, T., (1995) Rapporteur Talk Presented at the 24th International Cosmic Ray Conference, , Rome, Italy, University of Tokyo ICRR Report No. 343-95-9 (unpublished)Gaisser, T.K., (1992) Cosmic Rays and Particle Physics, , Cambridge University Press, Cambridge, EnglandCosta, C.G.S., Halzen, F., Salles, C., (1995) Phys. Rev. D, 52, p. 3890Lattes, C.M.G., Fujimoto, Y., Hasegawa, S., (1980) Phys. Rep., 65, p. 151Chinellato, J.A., (1981), Ph.D. thesis, Universidade Estadual de Campinas, BrazilChinellato, J.A., (1990) Proceedings of the 21st International Cosmic Ray Conference, 8, p. 259. , Adelaide, Australia, edited by R. J. Protheroe Graphic Services, Northfield, AustraliaKopenkin, V.V., Fujimoto, Y., private communicationBellandi, J., (1991) Nuovo Cimento C, 14, p. 15Navia, C.E., (1989) Phys. Rev. D, 40, p. 2898Nishimura, J., (1967) Handbuch der Physik, 62 (2 PART), p. 1. , edited by K. Sitte Springer, BerlinBellandi Fo, J., (1992) J. Phys. A, 25, p. 877Fletcher, R.S., Gaisser, T.K., Lipari, P., Stanev, T., (1994) Phys. Rev. D, 50, p. 5710Hara, T., (1983) Proceedings of the 18th International Cosmic Ray Conference, 9, p. 198. , Bangalore, India, 1983, edited by N. Durgaprasad et al. CTIFR, BombayNagano, M., (1984) J. Phys. G, 10, p. 1295Asakimori, K., (1994) Proceedings of the 7th International Symposium on Very High Energy Cosmic Ray Interactions, p. 513. , Tokyo, Japan, edited by Y. Fujimoto et al. TokyoRen, J.R., (1988) Phys. Rev. D, 38, p. 1404Biermann, P.L., Gaisser, T.K., Stanev, T., (1995) Phys. Rev. D, 51, p. 3450(1995) Proceedings of the 24th International Cosmic Ray Conference, 2, p. 710. , Rome, Italy INFN, RomeShibata, M., (1981) Phys. Rev. D, 24, p. 1847Wdowczyk, J., (1994) J. Phys. G, 20, p. 1001Lattes, C.M.G., (1971) Prog. Theor. Phys. Suppl., 47, p. 1(1973) Proceedings of the 13th International Cosmic Ray Conference, 3, p. 2219. , Denver, Colorado Colorado Associated University Press, BoulderAkashi, M., (1981) Nuovo Cimento A, 65, p. 355Ren, J.R., (1987) Nuovo Cimento C, 10, p. 43Burnett, T.H., (1984) Proceedings of the International Symposium on Cosmic Ray and Particle Physics, p. 468. , Tokyo, Japan, edited by A. Ohsawa and T. Yuda Yamada, TokyoWiebel-Sooth, B., Biermann, P.L., Meyer, H., (1995) Proceedings of the 24th International Cosmic Ray Conference, 2, p. 656. , Rome, Italy INFN, Rome(1995) Proceedings of the 24th International Cosmic Ray Conference, 2, p. 689. , Rome, Italy INFN, RomeYuda, T., (1991) Rapporteur Talk Presented at the 22nd International Cosmic Ray Conference, 5, p. 313. , Dublin, IrelandHalzen, F., (1993) AIP Conf. Proc. No. 276, p. 679. , Proceedings of the Seventh International Symposium on Very High Energy Cosmic Ray Interactions, Ann Arbor, Michigan, edited by L. Jones, AIP, New Yor

Leading particle effect, inelasticity and the connection between average multiplicities in {\bf e+e−e^+e^-} and {\bf pppp} processes

The Regge-Mueller formalism is used to describe the inclusive spectrum of the proton in $p p$ collisions. From such a description the energy dependences of both average inelasticity and leading proton multiplicity are calculated. These quantities are then used to establish the connection between the average charged particle multiplicities measured in {\bf $e^+e^-$} and {\bf $pp/{\bar p}p$} processes. The description obtained for the leading proton cross section implies that Feynman scaling is strongly violated only at the extreme values of $x_F$, that is at the central region ($x_F \approx 0$) and at the diffraction region ($x_F \approx 1$), while it is approximately observed in the intermediate region of the spectrum.Comment: 20 pages, 10 figures, to be published in Physical Review

Facial identification problem : a tracking based approach

This paper presents a method for face identification using a query by example approach. Our technique is suitable for use within Ambient Security Environments and is robust across variations in pose, expression and illuminations conditions. To account for these variations, we use a face template matching algorithm based on a 3D head model created from a single frontal face image. Thanks to our tracking-based approach our algorithm is able to extract simultaneously all parameters related to the face expression and to the 3D posture. With these estimates, we are able to reconstruct a frontal, neutral and normalized image on which dissimilarity analysis for identification and anomalies detection is performed. Our tracking process combined with dissimilarity analysis was tested on Kanade-Cohn database for expression independent identification and several other experimental databases for robustness

CR2S : competency roadmap to strategy

It is well acknowledged that human resource is one of the most important asset of a company. Competency Management is a well established approach for organizing recruitment and workforce training and development. But CM is more an more moving towards the integration into business and knowledge management frameworks having a crucial role in re-engineer, with competencies that account for the highest performance variance, determining the return-on-investment or economic value of competency initiatives, implementing organizational transformation and change strategies. Our approach, taking inspiration from Technology Roadmaps, proposes an integrated model for planning and coordinating organizations