Preoperative digital three-dimensional planning for rhinoplasty

BACKGROUND: This report describes preoperative digital planning for rhinoplasty using a new three-dimensional (3D) radiologic viewer that allows both patients and surgeons to visualize on a common monitor the 3D real aspect of the nose in its inner and outer sides. METHODS: In the period 2002 to 2008, 210 patients underwent rhinoplasty procedures in the authors' clinic. The patients were randomly divided into three groups according to the type of preoperative planning used: photos only, a simulated result by Adobe Photoshop, or the 3D radiologic viewer. The parameters evaluated included the number of patients that underwent surgery after the first consultation, the number of patients who asked for a reintervention, patient satisfaction (according to a test given to the patients 12 months postoperatively), the surgical time required for a functional intervention, and the improvement in nasal function by postoperative rhinomanometry and subjective evaluation. RESULTS: Computer-aided technologies led to a higher number of patients deciding to undergo a rhinoplasty. Simulation of the postoperative results was not as useful in the postoperative period due to the higher number of reintervention requests. CONCLUSION: The patients undergoing rhinoplasties preferred new technologies in the preoperative period. The advantages of using the 3D radiologic viewer included improved preoperative planning, reduction in intraoperative stress, a higher number of patients undergoing surgery, reduction in postoperative surgical corrections, reduction in surgical time for the functional intervention, a higher rate of improvement in nasal function, a higher percentage of postoperative satisfaction, and reduced costs

La Tessera de hospitalidad del oppidum de monte bernorio (Villarén de Valdivia, Palencia)

El oppidum de Monte Bernorio (Villarén, Pomar de Valdivia, Palencia), está situado en el centro de la región cantábrica y es uno de los más importantes yacimientos arqueológicos de la Edad del Hierro del norte de la Península Ibérica (fig. 1). Se emplaza en una muela caliza en la vertiente sur de la Cordillera Cantábrica ocupando una estratégica posición, lo que lo convierte en un referente natural y en un punto defensivo clave para el control de un amplio territorio. Domina una importante intersección de vías de comunicación naturales que conectan ambas vertientes de la Cordillera Cantábrica por su lado central. Además el oppidum controla otra importante vía de comunicación natural que permite recorrer el piedemonte cantábrico en dirección este-oeste por su vertiente meridional; así mismo se sitúa en una posición muy ventajosa para acceder a las cabeceras de las cuencas de los ríos Ebro y Pisuerga

Stroboscopic vision and sustained attention during coincidence-anticipation

We compared coincidence-anticipation performance in normal vision and stroboscopic vision as a function of time-on-task. Participants estimated the arrival time of a real object that moved with constant acceleration (-0.7, 0, +0.7 m/s2) in a pseudo-randomised order across 4 blocks of 30 trials in both vision conditions, received in a counter-balanced order. Participants (n=20) became more errorful (accuracy and variability) in the normal vision condition as a function of time-on-task, whereas performance was maintained in the stroboscopic vision condition. We interpret these data as showing that participants failed to maintain coincidence-anticipation performance in the normal vision condition due to monotony and attentional underload. In contrast, the stroboscopic vision condition placed a greater demand on visual-spatial memory for motion extrapolation, and thus participants did not experience the typical vigilance decrement in performance. While short-term adaptation effects from practicing in stroboscopic vision are promising, future work needs to consider for how long participants can maintain effortful processing, and whether there are negative carry-over effects from cognitive fatigue when transferring to normal visio

Estimation of unitary quantum operations

The problem of optimally estimating an unknown unitary quantum operation with the aid of entanglement is addressed. The idea is to prepare an entangled pair, apply the unknown unitary to one of the two parts and then measure the joint output state. This measurement could be an entangled one or it could be separable (e.g., LOCC). A comparison is made between these possibilities and it is shown that by using non-separable measurements one can improve the accuracy of the estimation by a factor of $2(d+1)/d$ where $d$ is the dimension of the Hilbert space on which $U$ acts.Comment: 6 pages. Revised version. Typos corrected. Some discussion added. Reference fixe

A note on finite PST-groups

This paper has been published in Journal of Group Theory, 10(2):205-210 (2007). Copyright 2007 by Walter de Gruyter. The final publication is available at www.degruyter.com. http://dx.doi.org/10.1515/JGT.2007.016 http://www.degruyter.com/view/j/jgth.2007.10.issue-2/jgt.2007.016/jgt.2007.016.xml[EN] A finite group G is said to be a PST-group if, for subgroups H and K of G with H Sylow-permutable in K and K Sylow-permutable in G, it is always the case that H is Sylow-permutable in G. A group G is a T*-group if, for subgroups H and K of G with H normal in K and K normal in G, it is always the case that H is Sylow-permutable in G. In this paper, we show that finite PST-groups and finite T*-groups are one and the same. A new characterisation of soluble PST-groups is also presented.Supported by Grant MTM2004-08219-C02-02 from Ministerio de Educación y Ciencia (Spain) and FEDER (European Union).Ballester Bolinches, A.; Esteban Romero, R.; Ragland, MF. (2007). A note on finite PST-groups. Journal of Group Theory. 2(10). doi:10.1515/JGT.2007.016210Agrawal, R. K. (1975). Finite Groups whose Subnormal Subgroups Permute with all Sylow Subgroups. Proceedings of the American Mathematical Society, 47(1), 77. doi:10.2307/2040211Alejandre, M. J., Ballester-Bolinches, A., & Pedraza-Aguilera, M. . (2001). Finite Soluble Groups with Permutable Subnormal Subgroups. Journal of Algebra, 240(2), 705-722. doi:10.1006/jabr.2001.8732Asaad, M., & Csörgö, P. (1997). Acta Mathematica Hungarica, 74(3), 235-243. doi:10.1023/a:1006563901921Ballester-Bolinches, A., & Esteban-Romero, R. (2002). Sylow Permutable Subnormal Subgroups of Finite Groups. Journal of Algebra, 251(2), 727-738. doi:10.1006/jabr.2001.9138Ballester-Bolinches, A., & Esteban-Romero, R. (2003). On finite J-groups. Journal of the Australian Mathematical Society, 75(2), 181-192. doi:10.1017/s1446788700003712Beidleman, J. C., Brewster, B., & Robinson, D. J. S. (1999). Criteria for Permutability to Be Transitive in Finite Groups. Journal of Algebra, 222(2), 400-412. doi:10.1006/jabr.1998.7964Kegel, O. H. (1962). Sylow-Gruppen und Subnormalteiler endlicher Gruppen. Mathematische Zeitschrift, 78(1), 205-221. doi:10.1007/bf01195169Robinson, D. J. S. (2001). The structure of finite groups in which permutability is a transitive relation. Journal of the Australian Mathematical Society, 70(2), 143-160. doi:10.1017/s1446788700002573Robinson, D. J. S. (2002). Ukrainian Mathematical Journal, 54(6), 1038-1049. doi:10.1023/a:102172462282

Corrigendum: A note on finite PST-groups [J. Group Theory 10 (2007), 205-210]

[EN] This paper has been published in Journal of Group Theory, 12(6):961-963 (2009). Copyright 2009 by Walter de Gruyter. The final publication is available at www.degruyter.com. http://dx.doi.org/10.1515/JGT.2009.026 http://www.degruyter.com/view/j/jgth.2009.12.issue-6/jgt.2009.026/jgt.2009.026.xmlThis is a corrigendum to "A Note on Finite PST-Groups" (J. Group Theory 10 (2007), 205-210).This research has been supported by the grants MTM2004-08219-C02-02 and MTM2007-68010-C03-02 from MEC (Spanish Government) and FEDER (European Union) and GV/2007/243 from Generalitat (València)http://dx.doi.org/10.1515/JGT.2009.026Ballester Bolinches, A.; Esteban Romero, R.; Ragland, MF. (2009). Corrigendum: A note on finite PST-groups [J. Group Theory 10 (2007), 205-210]. Journal of Group Theory. 6(12). https://doi.org/10.1515/JGT.2009.02661

Brachytherapy structural shielding calculations using Monte Carlo generated, monoenergetic data

To provide a method for calculating the transmission of any broad photon beam with a known energy spectrum in the range of 20 keV-1090 keV, through concrete and lead, based on the superposition of corresponding monoenergetic data obtained from Monte Carlo simulation

On two questions from the Kourovka Notebook

The aim of this paper is to give answers to some questions concerning intersections of system normalisers and prefrattini subgroups of finite soluble groups raised by the third author, Shemetkov and Vasil'ev in the Kourovka Notebook [10]. Our approach depends on results on regular orbits and it can be also used to extend a result of Mann [9] concerning intersections of injectors associated to Fitting classes.The first and fourth authors have been supported by the grant MTM2014-54707-C3-1-P from the Ministerio de Economía y Competitividad, Spain, and FEDER, European Union