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排序方式: 共有146条查询结果,搜索用时 359 毫秒
81.
Boeglin WU Coman L Ambrozewicz P Aniol K Arrington J Batigne G Bosted P Camsonne A Chang G Chen JP Choi S Deur A Epstein M Finn JM Frullani S Furget C Garibaldi F Gayou O Gilman R Hansen O Hayes D Higinbotham DW Hinton W Hyde C Ibrahim H de Jager CW Jiang X Jones MK Kaufman LJ Klein A Kox S Kramer L Kumbartzki G Laget JM LeRose J Lindgren R Margaziotis DJ Markowitz P McCormick K Meziani Z Michaels R Milbrath B Mitchell J Monaghan P Moteabbed M Moussiegt P Nasseripour R Paschke K Perdrisat C 《Physical review letters》2011,107(26):262501
The (2)H(e,e'p)n cross section at a momentum transfer of 3.5 (GeV/c)(2) was measured over a kinematical range that made it possible to study this reaction for a set of fixed missing momenta as a function of the neutron recoil angle θ(nq) and to extract missing momentum distributions for fixed values of θ(nq) up to 0.55 GeV/c. In the region of 35°≤θ(nq)≤45° recent calculations, which predict that final-state interactions are small, agree reasonably well with the experimental data. Therefore, these experimental reduced cross sections provide direct access to the high momentum component of the deuteron momentum distribution in exclusive deuteron electrodisintegration. 相似文献
82.
Ryan Skip Garibaldi 《代数通讯》2013,41(2):841-856
For (A, σ) a central simple algebra of even degree with orthogonal involution, we present a method for constructing isotropic right ideals in the even Clifford algebra (C 0(A, σ)σ) from isotropic right ideals in (A, σ). We then use this construction to fully describe the twisted flag varieties associated to algebraic groups of type D 4 (including the trialitarian groups). 相似文献
83.
Daphne Teck Ching Lai Jonathan M. Garibaldi Daniele Soria Christopher M. Roadknight 《Central European Journal of Operations Research》2014,22(3):475-499
Previously, a semi-manual method was used to identify six novel and clinically useful classes in the Nottingham Tenovus Breast Cancer dataset. 663 out of 1,076 patients were classified. The objectives of our work is three folds. Firstly, our primary objective is to use one single automatic method (post-initialisation) to reproduce the six classes for the 663 patients and to classify the remaining 413 patients. Secondly, we explore using semi-supervised fuzzy c-means with various distance metrics and initialisation techniques to achieve this. Thirdly, the clinical characteristics of the 413 patients are examined by comparing with the 663 patients. Our experiments use various amount of labelled data and 10-fold cross validation to reproduce and evaluate the classification. ssFCM with Euclidean distance and initialisation technique by Katsavounidis et al. produced the best results. It is then used to classify the 413 patients. Visual evaluation of the 413 patients’ classifications revealed common characteristics as those previously reported. Examination of clinical characteristics indicates significant associations between classification and clinical parameters. More importantly, association between classification and survival based on the survival curves is shown. 相似文献
84.
Tabrizi Ali Akbar Al-Bugharbee Hussein Trendafilova Irina Garibaldi Luigi 《Meccanica》2017,52(4-5):1201-1217
Meccanica - Most conventional diagnostic methods for fault diagnosis in rolling bearings are able to work only for the case of stationary operating conditions (constant speed and load), whereas,... 相似文献
85.
Hall A Collaboration John J. LeRose C.W. de Jager R.J. Feuerbach D.W. Higinbotham B. Reitz A. Acha P. Markowitz P. Bydovský M. Sotona C.C. Chang E. Cisbani F. Cusanno S. Frullani F. Garibaldi R. De Leo L. Lagamba S. Marrone M. Iodice G.M. Urciuoli 《Nuclear Physics A》2008,804(1-4):116-124
Results are presented from a new experiment (E94-107) in Hall A of the Thomas Jefferson National Accelerator Facility (JLab) producing , , and using electroproduction, (e,e′K+). In the hypernuclear missing-mass spectrum the experiment achieves very good energy resolution (670 keV FWHM) by exploiting the characteristics of the High Resolution spectrometer pair and the exceptional beam quality available at JLab. The spectrometers were used with the addition of an INFN provided pair of septum magnets to reach the desired small angles. Also, the Hall A standard complement of equipment was further augmented by the addition of a Ring Imaging Cherenkov detector (RICH) to achieve the best possible kaon identification. 相似文献
86.
Huang J Allada K Dutta C Katich J Qian X Wang Y Zhang Y Aniol K Annand JR Averett T Benmokhtar F Bertozzi W Bradshaw PC Bosted P Camsonne A Canan M Cates GD Chen C Chen JP Chen W Chirapatpimol K Chudakov E Cisbani E Cornejo JC Cusanno F Dalton MM Deconinck W de Jager CW De Leo R Deng X Deur A Ding H Dolph PA Dutta D El Fassi L Frullani S Gao H Garibaldi F Gaskell D Gilad S Gilman R Glamazdin O Golge S Guo L Hamilton D Hansen O Higinbotham DW Holmstrom T Huang M Ibrahim HF Iodice M Jiang X Jin G 《Physical review letters》2012,108(5):052001
We report the first measurement of the double-spin asymmetry A{LT} for charged pion electroproduction in semi-inclusive deep-inelastic electron scattering on a transversely polarized {3}He target. The kinematics focused on the valence quark region, 0.16相似文献
87.
Airapetian A Akopov N Akopov Z Amarian M Andrus A Aschenauer EC Augustyniak W Avakian R Avetissian A Avetissian E Bailey P Belostotski S Bianchi N Blok HP Böttcher H Borissov A Borysenko A Brüll A Bryzgalov V Capiluppi M Capitani GP Ciullo G Contalbrigo M Dalpiaz PF Deconinck W De Leo R Demey M De Nardo L De Sanctis E Devitsin E Diefenthaler M Di Nezza P Dreschler J Düren M Ehrenfried M Elalaoui-Moulay A Elbakian G Ellinghaus F Elschenbroich U Fabbri R Fantoni A Felawka L Frullani S Funel A 《Physical review letters》2006,96(16):162301
The first measurements of double-hadron production in deep-inelastic scattering within the nuclear medium were made with the HERMES spectrometer at DESY HERA using a 27.6 GeV positron beam. By comparing data for deuterium, nitrogen, krypton, and xenon nuclei, the influence of the nuclear medium on the ratio of double-hadron to single-hadron yields was investigated. Nuclear effects on the additional hadron are clearly observed, but with little or no difference among nitrogen, krypton, or xenon, and with smaller magnitude than effects seen on previously measured single-hadron multiplicities. The data are compared with models based on partonic energy loss or prehadronic scattering and with a model based on a purely absorptive treatment of the final-state interactions. Thus, the double-hadron ratio provides an additional tool for studying modifications of hadronization in nuclear matter. 相似文献
88.
We provide a survey of past research and a list of open problems regarding central simple algebras and the Brauer group over
a field, intended both for experts and for beginners. 相似文献
89.
Malace SP Paolone M Strauch S Albayrak I Arrington J Berman BL Brash EJ Briscoe B Camsonne A Chen JP Christy ME Chudakov E Cisbani E Craver B Cusanno F Ent R Garibaldi F Gilman R Glamazdin O Glister J Higinbotham DW Hyde-Wright CE Ilieva Y de Jager CW Jiang X Jones MK Keppel CE Khrosinkova E Kuchina E Kumbartzki G Lee B Lindgren R Margaziotis DJ Meekins D Michaels R Park K Pentchev L Perdrisat CF Piasetzky E Punjabi VA Puckett AJ Qian X Qiang Y Ransome RD Saha A Sarty AJ Schulte E Solvignon P 《Physical review letters》2011,106(5):052501
We measured with unprecedented precision the induced polarization P(y) in (4)He(e,e'p)(3)H at Q(2)=0.8 and 1.3 (GeV/c)(2). The induced polarization is indicative of reaction-mechanism effects beyond the impulse approximation. Our results are in agreement with a relativistic distorted-wave impulse approximation calculation but are overestimated by a calculation with strong charge-exchange effects. Our data are used to constrain the strength of the spin-independent charge-exchange term in the latter calculation. 相似文献
90.
Danagoulian A Mamyan VH Roedelbronn M Aniol KA Annand JR Bertin PY Bimbot L Bosted P Calarco JR Camsonne A Chang CC Chang TH Chen JP Choi S Chudakov E Degtyarenko P de Jager CW Deur A Dutta D Egiyan K Gao H Garibaldi F Gayou O Gilman R Glamazdin A Glashausser C Gomez J Hamilton DJ Hansen JO Hayes D Higinbotham DW Hinton W Horn T Howell C Hunyady T Hyde CE Jiang X Jones MK Khandaker M Ketikyan A Kubarovsky V Kramer K Kumbartzki G Laveissière G Lerose J Lindgren RA Margaziotis DJ Markowitz P 《Physical review letters》2007,98(15):152001
Cross-section values for Compton scattering on the proton were measured at 25 kinematic settings over the range s=5-11 and -t=2-7 GeV2 with a statistical accuracy of a few percent. The scaling power for the s dependence of the cross section at fixed center-of-mass angle was found to be 8.0+/-0.2, strongly inconsistent with the prediction of perturbative QCD. The observed cross-section values are in fair agreement with the calculations using the handbag mechanism, in which the external photons couple to a single quark. 相似文献