Search results for " Carl"
showing 10 items of 1737 documents
Comparison between simulated and observed LHC beam backgrounds in the ATLAS experiment at E beam =4 TeV
2018
Results of dedicated Monte Carlo simulations of beam-induced background (BIB) in the ATLAS experiment at the Large Hadron Collider (LHC) are presented and compared with data recorded in 2012. During normal physics operation this background arises mainly from scattering of the 4 TeV protons on residual gas in the beam pipe. Methods of reconstructing the BIB signals in the ATLAS detector, developed and implemented in the simulation chain based on the FLUKA Monte Carlo simulation package, are described. The interaction rates are determined from the residual gas pressure distribution in the LHC ring in order to set an absolute scale on the predicted rates of BIB so that they can be compared qua…
La enseñanza de la pintura en la Real Academia de Bellas Artes de San Carlos durante su primera época (1768 ‒ 1808)
2022
La Real Academia Bellas Artes de San Carlos se estableció en Valencia gracias al tesón de un grupo de artistas y prohombres locales, que consiguieron la protección de Carlos III el 14 de febrero de 1768. En sus aulas, los discípulos se formaron en las disciplinas de pintura, escultura, arquitectura y grabado. Posteriormente se ampliaron los estudios con la Escuela de flores y ornatos. El objetivo de este trabajo es analizar cómo se desarrolló la enseñanza de la pintura en la Academia de San Carlos durante su primera época, y qué consecuencias tuvo en la pintura valenciana de la segunda mitad del siglo XVIII. Para conseguir nuestros objetivos hemos acudido principalmente a los fondos documen…
Bestsellereiden arvot
2011
Tutkimukseni käsittelee arvoja bestsellereissä: millaisia arvoja bestsellereissä on, onko eri teoksissa samankaltaisia arvoja vai poikkeavatko teosten arvot huomattavasti toisistaan. Tarkastelen arvoja kolmessa vuonna 2008-2009 Euroopassa bestsellerlistoille nousseessa teoksessa: Khaled Hosseinin kirjassa A Thousand Splendid Suns (2007), Stieg Larssonin teoksessa Män som hatar kvinnor (2005), sekä Carlos Ruiz Zafónin romaanissa El Juego del Ángel (2008). Tutkimuksessa yhdistyvät sosiologinen kirjallisuudentutkimus, temaattinen tutkimus ja kirjallisuussosiologia. Tarkastelen näitä kirjoja erityisesti bestsellereinä, eli käsittelen bestsellereitä omana kirjallisena kenttänään. Teoksista esiin…
Cluster priors in the Bayesian modelling of fMRI data
2001
All-sky search in early O3 LIGO data for continuous gravitational-wave signals from unknown neutron stars in binary systems
2021
Rapidly spinning neutron stars are promising sources of continuous gravitational waves. Detecting such a signal would allow probing of the physical properties of matter under extreme conditions. A significant fraction of the known pulsar population belongs to binary systems. Searching for unknown neutron stars in binary systems requires specialized algorithms to address unknown orbital frequency modulations. We present a search for continuous gravitational waves emitted by neutron stars in binary systems in early data from the third observing run of the Advanced LIGO and Advanced Virgo detectors using the semicoherent, GPU-accelerated, binaryskyhough pipeline. The search analyzes the most s…
Estadística en física de partícules: El seu paper en el descobriment del bosó de Higgs
2014
L’estadistica ha representat un paper d’enorme importancia en el desenvolupament de la fisica de particules, pionera de l’anomenada «gran ciencia». La seua aplicacio ha evolucionat al compas dels progressos tecnologics, que han permes passar de registrar uns pocs centenars de «successos» a registrar-ne milers de milions. Aquest article discuteix sobre com s’ha resolt el problema de la manipulacio d’aquestes quantitats massives de dades i com s’han utilitzat les principals eines estadistiques des dels anys 1990 per a cercar senyals cada vegada mes petits ocults entre un soroll de fons cada vegada major. Molts experiments en la historia de la fisica de particules podrien il·lustrar el paper q…
Comprehensive Strategy for Proton Chemical Shift Prediction: Linear Prediction with Nonlinear Corrections
2014
A fast 3D/4D structure-sensitive procedure was developed and assessed for the chemical shift prediction of protons bonded to sp3carbons, which poses the maybe greatest challenge in the NMR spectral parameter prediction. The LPNC (Linear Prediction with Nonlinear Corrections) approach combines three well-established multivariate methods viz. the principal component regression (PCR), the random forest (RF) algorithm, and the k nearest neighbors (kNN) method. The role of RF is to find nonlinear corrections for the PCR predicted shifts, while kNN is used to take full advantage of similar chemical environments. Two basic molecular models were also compared and discussed: in the MC model the desc…
Graphical interface for designing geometries and processing DICOM images for PENELOPE
2016
One of he most difficult steps when preparing a Monte Carlo calculation is the design of their geometries. Such process is an error-prone, time-consuming, and complex step for any simulation in the field of medical physics. The software VoxelMages has been developed to help the user in this complex task. It allows to design arbitrary geometries and to process DICOM image files for simulations with the general-purpose Monte Carlo code PENELOPE. Its main characteristics are described in the following.
Dynamic Shakedown Sensitivity Analysis by Means of a Probabilistic Approach
2017
The shakedown limit load multiplier problem for elastic plastic structures subjected to a combination of fixed and seismic loads is treated. In particular, reference is firstly made to the unrestricted dynamic shakedown theory. The relevant seismic load history is modeled as a repeated one and, with reference to classically damped structures, appropriate modal analyses are utilized. With the aim of evaluating the reliability of the results arising from the application of the cited theory, a recent probabilistic approach is also utilized. This approach adopts the Monte Carlo method in order to define the necessary seismic acceleration histories and finally compute the related shakedown limit…
Monte Carlo dosimetric study of the Flexisource Co-60 high dose rate source.
2011
Purpose: Recently, a new HDR 60 Co brachytherapy source, Flexisource Co-60, has been developed (Nucletron B.V. Veenendaal, The Netherlands). This study aims to obtain dosimetric data for this source for its use in clinical practice as required by AAPM and ESTRO. Material and methods: Two Monte Carlo radiation transport codes were used: Penelope2008 and GEANT4. The source was centrally-positioned in a 100 cm radius water phantom. Absorbed dose and collisional kerma were obtained using 0.01 cm (close) and 0.1 cm (far) sized voxels to provide high-resolution dosimetry near (far from) the source. Dose rate distributions obtained with the two Monte Carlo codes were compared. Results and Discussi…