Search results for "virtu"
showing 10 items of 1987 documents
Isospin breaking effects in the X(3872) resonance
2009
In this paper we study the effects of isospin breaking in the dynamical generation of the X(3872) state. We also calculate the ratio of the branching fractions of the $X$ decaying into $J/\psi$ with two and three pions, which has been measured experimentally to be close to unity. Together with the X(3872), of positive C-parity, we predict the existence of a negative C-parity state and we comment on which decay channel is more promising to observe this state.
Distortion of the virtual photon cloud due to a static electric field
1988
The structure of the virtual transverse-photon cloud surrounding a ground-state hydrogen atom is considered in the presence of a uniform static electric field, which is capable of polarizing the atom. It is shown that this virtual cloud is distorted with respect to the spherically symmetric shape which is obtained when no static electric field is present. The distortion is carried by new components of the cloud, arising from the contributions of magnetic-dipole and electric-quadrupole virtual photons. These new contributions are shown to possess an overall cylindrical symmetry around the direction of the static field, and to be present also at large distances from the atom. The possibility …
Deeply virtual compton scattering off the neutron.
2007
The present experiment exploits the interference between the Deeply Virtual Compton Scattering (DVCS) and the Bethe-Heitler processes to extract the imaginary part of DVCS amplitudes on the neutron and on the deuteron from the helicity-dependent D$({\vec e},e'\gamma)X$ cross section measured at $Q^2$=1.9 GeV$^2$ and $x_B$=0.36. We extract a linear combination of generalized parton distributions (GPDs) particularly sensitive to $E_q$, the least constrained GPD. A model dependent constraint on the contribution of the up and down quarks to the nucleon spin is deduced.
‘Una nuova versione del Quid suum virtutis’
1988
Reliģiski-filozofiski raksti, 20
2016
Katrā no rakstiem, kas publicēti šajos "Reliģiski-filozofiskos rakstos", šķiet, iespējams saskatīsim gan pagātnes sprostā patvērušos brīvību ar tās apreibinošajās ilūzijām par neatkarību ārpus sprosta, gan nojaust neatrisināmo un reizēm iznīcinošo dilemmu starp gara un reālo pasauli, starp spēli un brīdi, kad spēle beidzas. Piemēram, par pagātnē iesprostotas virtuālās pasaules konstruēšanu, kuras brīvībā izlaušanās mērāma iznīcinātu dzīvību tūkstošos, mums stāsta Māris Kūlis savā rakstā “Islāma valsts propaganda digitālajā laikmetā”. Uzsverot, ka Islāma valsts īstenotais militārais un ārkārtīgi agresīvais džihāds ar vēl nepieredzētām sekmēm ir izveidojis sinkrētisku reliģiskās degsmes un mū…
Electrical distribution substation remote diagnosis and control system
2014
This paper presents the conception, design, set up and realization of a prototype system for telemanagement of a MV/LV substation. The prototype has been developed according to the current standards. This system allows to monitor the status of the MV/LV substation box, of the medium voltage equipment, of the transformer and of the low voltage equipment. In particular, the system acts when some specified events occur. The prototype has been realized by using a DAQ; the software that implement the telemanagement system has been developed in LabVIEW environment. The system allows a remote monitoring of the quantities of interest that is carried out using the TeamViewer software able to establi…
La realidad virtual en las intervenciones psicológicas con pacientes oncológicos
2014
El objetivo de este trabajo es presentar las principales aportaciones de la Realidad Virtual (RV) en el tratamiento psicologico con pacientes oncologicos, y describir un programa de intervencion que utiliza esta tecnologia para promover bienestar emocional en pacientes hospitalizados. La RV se presenta como una prometedora herramienta de apoyo al paciente oncologico. Diversos estudios plantean su utilidad para hacer algunos tratamientos medicos mas tolerables, para reducir los niveles de distres y dolor, asi como promover mayores niveles de emociones positivas. Se ha empleado principalmente con pacientes ambulatorios, existiendo una menor proporcion de propuestas dirigidas al periodo de hos…
Uso de la Realidad Virtual en Educación: un análisis bibliométrico
2022
Virtual Reality includes different technologies through which a user can experience a virtual world created in 3 dimensions by computer. Although its adoption has been slow, since the devices required to access virtual reality were expensive, there have been experiences in education since the 1990s. The present study carries out a bibliometric study in which 1074 articles related to the use of virtual reality in education from 1990 to the beginning of 2021 have been analyzed. It has been studied, from a quantitative point of view, the evolution of the annual scientific production, collaboration and production of authors, nationalities and sources of the articles. An analysis of citations, c…
TRIDIMENSIONAL ANALYSIS PROPOSAL TO INTEGRATE DIFFERENT ARCHAEOLOGICAL FIELDWORK CONDUCTED AT CUEVA DE LA COCINA (DOS AGUAS, VALENCIA)
2016
[EN] At this document we present a computer protocol, designed for the development of a digital environment which will allow virtual reconstruction of both, the stratigraphic information and the material record found at Cueva de la Cocina (Dos Aguas, Valencia). By this we also mean to relate the most recent fieldwork at the site to that carried on during the 1970s. The first interventions inside the cavity date back to the first half of the XX century, when a complex sequence, which comprehended layers mainly related to the last hunter-gutherers and the first farmers, was identified. Accurateness, both describing and gathering precise information of the site was not a priority according to …
Hans J. Morgenthau´s Turn from International Law to International Relations: A transition affected by History
2018
Este texto aborda el papel que las consideraciones históricas desempeñaron en un movimiento teórico sustancial: el paso que a partir de los años cuarenta se produce desde el Derecho Internacional a las Relaciones Internacionales en tanto que principal disciplina ordenadora del ámbito interestatal. Se tomará a Hans J. Morgenthau como el ejemplo más claro de este movimiento. Al igual que tantos otros intelectuales europeos exiliados en Estados Unidos, el cambio de continente y de contexto académico implicará para Morgenthau el salto del estudio del Derecho al estudio de la Política. Para explicar este movimiento y, en concreto, el peso que la Historia tiene en él, se estructurará el artículo …