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1,183 results on '"Ganz, R."'

1. Production of phi Mesons in Au+Au Collisions at 11.7 A GeV/c

Author

E917 Collaboration, Back, B. B., Betts, R. R., Chang, J., Chang, W. C., Chi, C. Y., Chu, Y. Y., Cumming, J. B., Dunlop, J. C., Eldredge, W., Fung, S. Y., Ganz, R., Garcia-Solis, E., Gillitzer, A., Heinzelman, G., Henning, W. F., Hofman, D. J., Holzman, B., Kang, J. H., Kim, E. J., Kim, S. Y., Kwon, Y., McLeod, D., Mignerey, A. C., Moulson, M., Nanal, V., Ogilvie, C. A., Pak, R., Ruangma, A., Russ, D. E., Seto, R. K., Stanskas, P. J., Stephans, G. S. F., Wang, H., Wolfs, F. L. H., Wuosmaa, A. H., Xiang, H., Xu, G. H., Yao, H. B., and Zou, C. M.

Subjects
Nuclear Experiment
Abstract

We report on a measurement of phi-meson production in Au+Au collisions at a beam momentum of 11.7 A GeV/c by Experiment E917 at the AGS. The measurement covers the midrapidity region 1.2 < y < 1.6. Transverse-mass spectra and the rapidity distribution are presented as functions of centrality characterized by the number of participant projectile nucleons. The yield of phi's per participant projectile nucleon increases strongly in central collisions in a manner similar to that observed for kaons., Comment: 12 pages, 3 table, 14 eps figures which use \includegraphics, revtex 4, revised version submitted to Phys. Rev. C

Published
2003
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2. Antilambda production in Au+Au collisions at 11.7 A GeV/c

Author

E917 Collaboration, Back, B. B., Betts, R. R., Chang, J., Chang, W. C., Chi, C. Y., Chu, Y. Y., Cumming, J. B., Dunlop, J. C., Eldredge, W., Fung, S. Y., Ganz, R., Garcia-Solis, E., Gillitzer, A., Heinzelman, G., Henning, W. F., Hofman, D. J., Holzman, B., Kang, J. H., Kim, E. J., Kim, S. Y., Kwon, Y., McLeod, D., Mignerey, A. C., Moulson, M., Nanal, V., Ogilvie, C. A., Pak, R., Ruangma, A., Russ, D. E., Seto, R. K., Stanskas, P. J., Stephans, G. S. F., Wang, H., Wolfs, F. L. H., Wuosmaa, A. H., Xiang, H., Xu, G. H., Yao, H. B., and Zou, C. M.

Subjects
Nuclear Experiment
Abstract

We present results from Experiment E917 for antilambda and antiproton production in Au+Au collisions at 11.7 A GeV. We have measured invariant spectra and yields for both species in central and peripheral collisions. We find that the antilambda/antiproton ratio near mid-rapidity increases from 0.26+0.19-0.15 in peripheral collisions to 3.6+4.7-1.8 in central collisions, a value that is substantially larger than current theoretical estimates., Comment: 5 pages, 1 table, 3 eps figures which use \includegraphics, revtex 4

Published
2001
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4. Baryon Rapidity Loss in Relativistic Au+Au Collisions

Author

E917 Collaboration, Back, B. B., Betts, R. R., Chang, J., Chang, W. C., Chi, C. Y., Chu, Y. Y., Cumming, J. B., Dunlop, J. C., Eldredge, W., Fung, S. Y., Ganz, R., Garcia-Solis, E., Gillitzer, A., Heintzelman, G., Henning, W. F., Hofman, D. J., Holzman, B., Kang, J. H., Kim, E. J., Kim, S. Y., Kwon, Y., McLeod, D., Mignerey, A. C., Moulson, M., Nanal, V., Ogilvie, C. A., Pak, R., Ruangma, A., Russ, D. E., Seto, R. K., Stanskas, P. J., Stephans, G. S. F., Wang, H. Q., Wolfs, F. L. H., Wuosmaa, A. H., Xiang, H., Xu, G. H., Yao, H. B., and Zou, C. M.

Subjects
Nuclear Experiment
Abstract

An excitation function of proton rapidity distributions for different centralities is reported from AGS Experiment E917 for Au+Au collisions at 6, 8, and 10.8 GeV/nucleon. The rapidity distributions from peripheral collisions have a valley at midrapidity which smoothly change to distributions that peak at midrapidity for central collisions. The mean rapidity loss increases with increasing beam energy, whereas the fraction of protons consistent with isotropic emission from a thermal source at midrapidity decreases with increasing beam energy., Comment: 9 pages, 3 figures, 1 table replaced version has figures rotated

Published
2000
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5. Systematic Study of Hadronic Observables in Nucleus Nucleus Collisions at CERN SPS

Author

Ganz, R.

Subjects
Nuclear Experiment
Abstract

The possible transition of nuclear matter to a deconfined phase in relativistic nucleus-nucleus collisions is explored by a systematic variation of the collision system by means of system size, beam energy and centrality of the collision all measured within the same experiment NA49 at the CERN SPS. The investigation takes advantage of the large number of hadronic observables covered over a wide phase space by the acceptance of the NA49 TPCs., Comment: 3 pages and 4 figures Proceedings of the International Europhysics Conference on High Energy Physics, Tampere, Finland, 15-21 July 1999, edited by K. Huitu, H. Kurki-Suonio and J. Maalampi, and published by IOP Publishing (Bristol, UK)

Published
1999

6. A systematic study of two particle correlations from NA49 at CERN SPS

Author

Ganz, R.

Subjects
Nuclear Experiment
Abstract

A systematic study of two particle correlations measured by the NA49 experiment is summarized. Radii from Bose Einstein interferometry have been determined separately in different parts of phase space, for different collision systems and at different incident beam energies. Moreover, first results of a new method of accessing space-time asymmetries in the emission of particles by means of non identical particle correlations are presented., Comment: 4 pages 3 figures publ. in proc. of QM99, Torino It Nuclear Physics A

Published
1999
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7. Strangeness production in high density baryon matter

Author

Ganz, R.

Subjects
Nuclear Experiment
Abstract

Strangeness production in heavy-ion collisions, when compared to proton proton collisions, is potentially a sensitive probe for collective energy deposition and therefore for reaction mechanisms in general. It may therefore provide insight into possible QGP formation in dense nuclear matter. To establish an understanding of the observed yields, a systematic study of high density baryon matter at different beam energies is essential. This might also reveal possible discontinuities in the energy dependence of the reaction mechanism. We present preliminary results for kaon production in Au+Au collisions at beam kinetic energies of 6, 8, and 10.7 GeV/u obtained by the E917 experiment at the AGS (BNL). These measurements complement those carried out by the E866 collaboration at 2, 4, and 10.7 GeV/u with a significantly enlarged data sample. In both experiments a large range of rapidities was covered by taking data at different angular settings of the magnetic spectrometer., Comment: 8 pages 6 figues

Published
1998
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8. HBT correlation in 158 AGeV Pb+Pb collisions

Author

Ganz, R.

Subjects
Nuclear Experiment
Abstract

The large acceptance TPCs of the NA49 spectrometer allow for a systematic multidimensional study of two-particle correlations in different part of phase space. Results from Bertsch-Pratt and Yano-Koonin-Podgoretskii parametrizations are presented differentially in transverse pair momentum and pair rapidity. These studies give an insight into the dynamical space-time evolution of relativistic Pb+Pb collisions, which is dominated by longitudinal expansion., Comment: 7 figures 12 pages

Published
1998

9. Production of phi-mesons in p+p, p+Pb and central Pb+Pb collisions at Ebeam = 158 A GeV

Author

Afanasiev, S.V., Anticic, T., Bachler, J., Barna, D., Barnby, L.S., Bartke, J., Barton, R.A., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C.O., Boimska, B., Bracinik, J., Brady, F.P., Brun, R., Buncic, P., Carr, L., Cebra, D., Cooper, G.E., Cramer, J.G., Csato, P., Eckardt, V., Eckhardt, F., Ferenc, D., Fischer, H.G., Fodor, Z., Foka, P., Freund, P., Friese, V., Ftacnik, J., Gal, J., Ganz, R., Gazdzicki, M., Gladysz, E., Grebieszkow, J., Harris, J.W., Hegyi, S., Hlinka, V., Hohne, C., Igo, G., Ivanov, M., Jacobs, P., Janik, R., Jones, P.G., Kadija, K., Kolesnikov, V.I., Kowalski, M., Lasiuk, B., Levai, P., Malakhov, A.I., Margetis, S., Markert, C., Mayes, B.W., Melkumov, G.L., Mischke, A., Molnar, J., Nelson, J.M., Odyniec, G., Oldenburg, M.D., Palla, G., Panagiotou, A.D., Petridis, A., Pikna, M., Pinsky, L., Poskanzer, A.M., Prindle, D.J., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Ritter, H.G., Rohrich, D., Roland, C., Roland, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Semenov, A.Yu., Schafer, E., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Snellings, R., Squier, G.T.A., Stock, R., Strmen, P., Strobele, H., Susa, T., Szarka, I., Szentpetery, I., Sziklai, J., Toy, M., Trainor, T.A., Trentalange, S., Ullrich, T., and Varga, D.

Published
2000

10. Centrality Dependence of Directed and Elliptic Flow at the SPS

Author

Poskanzer, Arthur M., Voloshin, Sergei A., NA49 Collaboration, Bachler, J., Barna, D., Barnby, L.S., Bartke, J., Barton, R.A., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Blyth, C.O., Boimska, B., Bracinik, J., Brady, F.P., Brockmann, R., Brun, R., Buncic, P., Carr, L., Cebra, D., Cooper, G.E., Cramer, J.G., Csato, P., Eckardt, V., Eckhardt, F., Ferenc, D., Fischer, H.G., Fodor, Z., Foka, P., Freund, P., Friese, V., Ftacnik, J., Gal, J., Ganz, R., Gazdzicki, M., Gladysz, E., Grebieszkow, J., Harris, J.W., Hegyi, S., Hlinka, V., Hohne, C., Igo, G., Ivanov, M., Jacobs, P., Janik, R., Jones, P.G., Kadija, K., Kolesnikov, V.I., Kowalski, M., Lasiuk, B., Levai, P., Malakhov, A.I., Margetis, S., Markert, C., Mayes, B.W., Melkumov, G.L., Molnar, J., Nelson, J.M., Odyniec, G., Oldenburg, M.D., Palla, G., Panagiotou, A.D., Petridis, A., Pikna, M., Pinsky, L., Poskanzer, A.M., Prindle, D.J., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Ritter, H.G., Rohrich, D., Roland, C., Roland, G., Rybicki, A., Sammer, T., Sandoval, A., Sann, H., Semenov, A.Yu., Schafer, E., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Snellings, R., Squier, G.T.A., Stock, R., Strmen, P., Stroebele, H., Susa, T., Szarka, I., Szentpetery, I., Sziklai, J., Toy, M., Trainor, T.A., Trentalange, S., and Ullrich, T.

Subjects
relativistic SPS NA49 flow centrality
Abstract

New data with a minimum bias trigger for 158 GeV/nucleon Pb + Pb have been analyzed. Directed and elliptic flow as a function of rapidity of the particles and centrality of the collision are presented. The centrality dependence of the ratio of elliptic flow to the initial space elliptic anisotropy is compared to models.

Published
1999

11. Au+Au reactions at the AGS: Experiments E866 and E917

Author

Ogilvie, CA, Ahle, L, Akiba, Y, Ashktorab, K, Baker, MD, Beavis, D, Britt, HC, Chang, J, Chasman, C, Chen, Z, Chu, YY, Chujo, T, Cianciolo, V, Cole, BA, Crawford, HJ, Cumming, JB, Debbe, R, Dunlop, JC, Eldredge, W, Engelage, J, Fung, S-Y, Garcia, E, Gushue, S, Hamagaki, H, Hansen, L, Hayano, RS, Heintzelman, G, Judd, E, Kang, J, Kim, E-J, Kumagai, A, Kurita, K, Lee, J-H, Luke, J, Miake, Y, Mignerey, A, Moskowitz, B, Moulson, M, Muentz, C, Nagamiya, S, Nagano, K, Namboodiri, MN, Olness, J, Oyama, K, Remsberg, LP, Sako, H, Sangster, TC, Seto, R, Shea, J, Shigaki, K, Soltz, R, Steadman, SG, Stephans, GSF, Tamagawa, T, Tannenbaum, MJ, Thomas, JH, Ueno-Hayashi, S, Videb˦k, F, Wang, F, Wu, Y, Xiang, H, Xu, GH, Yagi, K, Yao, H, Zajc, WA, Zhu, F, Back, B, Betts, RR, Britt, H, Chang, WC, Chi, CY, Chu, Y, Cumming, J, Fung, SY, Ganz, R, Gillitzer, A, Henning, W, Hofman, D, Holzman, B, Kang, JH, Kim, EJ, Kim, SY, Kwon, Y, McLeod, D, Nanal, V, Pak, R, Ruangma, A, Russ, D, and Stanskas, J

Subjects
nucl-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

Particle production and correlation functions from Au+Au reactions have beenmeasured as a function of both beam energy (2-10.7AGeV) and impact parameter.These results are used to probe the dynamics of heavy-ion reactions, confronthadronic models over a wide range of conditions and to search for the onset ofnew phenomena.

Published
1998

12. Hüftkopfdurchblutung und Resurfacing

Author

Beaulé, P.E., Ganz, R., and Leunig, M.

Abstract

Zusammenfassung: Mit der Einführung von Metall-Metall-Gleitpaarungen hat der Oberflächenersatz an der Hüfte eine Renaissance erlebt, da implantatverursachte Probleme, insbesondere abriebsbedingte Osteolysen, gelöst erscheinen. Nicht gelöst sind jedoch weiterhin die Probleme der Schenkelhalsfrakturen, Schenkelhalsschwund und Kappenlockerungen, deren Ursachen kontrovers diskutiert werden. In den letzten Jahren hat sich zunehmende Evidenz dafür ergeben, dass sowohl der häufig gebrauchte dorsale Zugang zum Hüftgelenk aber auch die Präparation des Epiphysenstumpfes die Durchblutung des Hüftkopfes kritisch schädigen und damit die Knochenbiologie kompromittieren können. Kommt mechanischer Stress (Impaktierung, Hitzeentwicklung beim Zementieren) während der Implantation hinzu, so kann dies vom präparierten Femurende nicht mehr kompensiert werden. Diese Arbeit fasst den heutigen Kenntnisstand zur Durchblutung des Femurkopfes zusammen und stellt ein Konzept vor diese auch nach einem Oberflächenersatz zu erhalten.

Published
2024
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18. E917 at the AGS: High Density Baryon Matter

Author

Pak, Robert, Back, B. B., Betts, R. R., Britt, H. C., Chang, J., Chang, W. C., Chi, C. Y., Chu, Y. Y., Cumming, J. B., Dunlop, J. C., Eldredge, W., Fung, S. Y., Ganz, R., Garcia-Solis, E., Gillitzer, A., Heintzelman, G., Henning, W. F., Hofman, D. J., Holzman, B., Kang, J. H., Kim, E. J., Kim, S. Y., Kwon, Y., McLeod, D., Mignerey, A. C., Moulson, M., Nanal, V., Ogilvie, C. A., Pak, R., Ruangma, A., Russ, D. E., Seto, R. K., Stanskas, P. J., Stephans, G. S. F., Wang, H. Q., Wolfs, F. L. H., Wuosmaa, A. H., Xiang, H., Xu, G. H., Yao, H. B., Zou, C. M., Bauer, Wolfgang, editor, and Ritter, Hans-Georg, editor

Published
1998
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19. Proximales Femur

Author

Ganz, R., Canha, N. J. R., Gonzalo-Vivar, F., Trojan, E., Picco, Ch., Müller, M. E., Allgöwer, M., Schneider, R., and Willenegger, H.

Published
1992
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22. Proximal Femur

Author

Ganz, R., Müller, Maurice E., Allgöwer, Martin, Schneider, Robert, and Willenegger, Hans

Published
1991
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24. Kreuzbandaplasie

Author

Stäubli, H.-U., Jakob, R. P., Witschger, P., Ganz, R., Jakob, R. P., editor, and Stäubli, H.-U., editor

Published
1990
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29. A New Approach to Orthopedic Surgery Planning Using Deep Reinforcement Learning and Simulation

Author

Ackermann, Joëlle, Wieland, M, Hoch, Armando, Ganz, R, Snedeker, J G, Oswald, M R, Pollefeys, Marc, Zingg, P O, Esfandiari, H, Fürnstahl, Philipp, University of Zurich, de Bruijne, M, Cattin, P C, Cotin, S, Padoy, N, Speidel, S, Zheng, Y, Essert, C, and Ackermann, Joëlle

Subjects
610 Medicine & health, 10046 Balgrist University Hospital, Swiss Spinal Cord Injury Center, 1700 General Computer Science, 2614 Theoretical Computer Science
Published
2021
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30. A New Approach to Orthopedic Surgery Planning Using Deep Reinforcement Learning and Simulation

Author

de Bruijne, M, Cattin, P C, Cotin, S, Padoy, N, Speidel, S, Zheng, Y, Essert, C, de Bruijne, M ( M ), Cattin, P C ( P C ), Cotin, S ( S ), Padoy, N ( N ), Speidel, S ( S ), Zheng, Y ( Y ), Essert, C ( C ), Ackermann, Joëlle, Wieland, M, Hoch, Armando, Ganz, R, Snedeker, J G, Oswald, M R, Pollefeys, Marc, Zingg, P O, Esfandiari, H, Fürnstahl, Philipp, de Bruijne, M, Cattin, P C, Cotin, S, Padoy, N, Speidel, S, Zheng, Y, Essert, C, de Bruijne, M ( M ), Cattin, P C ( P C ), Cotin, S ( S ), Padoy, N ( N ), Speidel, S ( S ), Zheng, Y ( Y ), Essert, C ( C ), Ackermann, Joëlle, Wieland, M, Hoch, Armando, Ganz, R, Snedeker, J G, Oswald, M R, Pollefeys, Marc, Zingg, P O, Esfandiari, H, and Fürnstahl, Philipp

Abstract

Computer-assisted orthopedic interventions require surgery planning based on patient-specific three-dimensional anatomical models. The state of the art has addressed the automation of this planning process either through mathematical optimization or supervised learning, the former requiring a handcrafted objective function and the latter sufficient training data. In this paper, we propose a completely model-free and automatic surgery planning approach for femoral osteotomies based on Deep Reinforcement Learning which is capable of generating clinical-grade solutions without needing patient data for training. One of our key contributions is that we solve the real-world task in a simulation environment tailored to orthopedic interventions based on an analytical representation of real patient data, in order to overcome convergence, noise, and dimensionality problems. An agent was trained on simulated anatomy based on Proximal Policy Optimization and inference was performed on real patient data. A qualitative evaluation with expert surgeons and a complementary quantitative analysis demonstrated that our approach was capable of generating clinical-grade planning solutions from unseen data of eleven patient cases. In eight cases, a direct comparison to clinical gold standard (GS) planning solutions was performed, showing our approach to perform equally good or better in 80% (surgeon 1) respectively 100% (surgeon 2) of the cases.

Published
2021

41. Computer-assisted femoral head reduction osteotomies: an approach for anatomic reconstruction of severely deformed Legg-Calvé-Perthes hips. A pilot study of six patients

Author

Fürnstahl, P, Casari, F A; https://orcid.org/0000-0002-9530-4861, Ackermann, J, Marcon, M, Leunig, M, Ganz, R, Fürnstahl, P, Casari, F A; https://orcid.org/0000-0002-9530-4861, Ackermann, J, Marcon, M, Leunig, M, and Ganz, R

Abstract

BACKGROUND Legg-Calvé-Perthes (LCP) is a common orthopedic childhood disease that causes a deformity of the femoral head and to an adaptive deformity of the acetabulum. The altered joint biomechanics can result in early joint degeneration that requires total hip arthroplasty. In 2002, Ganz et al. introduced the femoral head reduction osteotomy (FHRO) as a direct joint-preserving treatment. The procedure remains one of the most challenging in hip surgery. Computer-based 3D preoperative planning and patient-specific navigation instruments have been successfully used to reduce technical complexity in other anatomies. The purpose of this study was to report the first results in the treatment of 6 patients to investigate whether our approach is feasible and safe. METHODS In this retrospective pilot study, 6 LCP patients were treated with FHRO in multiple centers between May 2017 and June 2019. Based on patient-specific 3D-models of the hips, the surgeries were simulated in a step-wise fashion. Patient-specific instruments tailored for FHRO were designed, 3D-printed and used in the surgeries for navigating the osteotomies. The results were assessed radiographically [diameter index, sphericity index, Stulberg classification, extrusion index, LCE-, Tönnis-, CCD-angle and Shenton line] and the time and costs were recorded. Radiologic values were tested for normal distribution using the Shapiro-Wilk test and for significance using Wilcoxon signed-rank test. RESULTS The sphericity index improved postoperatively by 20% (p = 0.028). The postoperative diameter of the femoral head differed by only 1.8% (p = 0.043) from the contralateral side and Stulberg grading improved from poor coxarthrosis outcome to good outcome (p = 0.026). All patients underwent acetabular reorientation by periacetabular osteotomy. The average time (in minutes) for preliminary analysis, computer simulation and patient-specific instrument design was 63 (±48), 156 (±64) and 105 (±68.5), respectively. CONCLUSI

Published
2020

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