7,557 research outputs found
Writing a Case Report for the American Journal of Physical Medicine & Rehabilitation and the European Journal of Physical and Rehabilitation Medicine
No full textOzcakar L, Franchignoni F, Negrini S, Frontera W: Writing a case report for the American Journal of Physical Medicine & Rehabilitation and the European Journal of Physical and Rehabilitation Medicine. Am J Phys Med Rehabil 2013; 92: 183-186.
Case reports (CRs) have led to the description and discovery of new diseases, syndromes, therapeutic complications or side effects, and previously unknown potential benefits of pharmacologic agents. CRs may also be used as an effective training strategy for novice authors to develop the skills needed for medical writing. However, too often, CRs do not follow standards for excellence in scientific writing. Therefore, in this article, the American Journal of Physical Medicine & Rehabilitation and the European Journal of Physical and Rehabilitation Medicine collaborate with the purpose of providing guidance to authors in selecting CRs that might be appropriate for publication. In addition, the authors discuss different aspects of the preparation of a well written CR in accordance with the mission and editorial views of both journals
Gamma Ray Bursts from delayed collapse of neutron stars to quark matter stars
No full textWe propose a model to explain how a Gamma Rays Burst can take place days or years after a supernova explosion. Our model is based on the conversion of a pure hadronic star (neutron star) into a star made at least in part of deconfined quark matter. The conversion process can be delayed if the surface tension at the interface between hadronic and deconfined-quark-matter phases is taken into account. The nucleation time (i.e. the time to form a critical-size drop of quark matter) can be extremely long if the mass of the star is small. Via mass accretion the nucleation time can be dramaticaly reduced and the star is finally converted into the stable configuration. A huge amount of energy, of the order of 10(52)-10(53) erg, is released during the conversion process and can produce a powerful Gamma Ray Burst. The delay between the supernova explosion generating the metastable neutron star and the new collapse can explain the delay proposed in GRB990705 and in GRB011211
LAUE - Una Lente per i raggi Gamma
No full textWe will describe the LAUE project, supported by the Italian Space Agency, whose aim is to demonstrate the capability to build a focusing optics in the hard X-/soft gamma-ray domain (80{600 keV). To show the lens feasibility, the assembling of a Laue lens petal prototype with 20 m focal length is ongoing. Indeed, a feasibility study, within the LAUE project, has demonstrated that a Laue lens made of petals is feasible. Our goal is a lens in the 80-600 keV energy band. In addition to a detailed description of the new LARIX facility, in which the lens is being assembled, we will report the results of the project obtained so far
Museo de la Revolución en la Frontera: Reestructuración, el impacto en su público
No full textResultados del estudio de públicos realizado por el personal del museo de la Revolución de la Frontera, bajo la asesoría del Programa Nacional de Estudios de Público de la Coordinación Nacional de Museos y Exposiciones.</p
The GRB prompt emission from X- to gamma-rays
No full textThe status of the Gamma-Ray Burst observations after the BeppoSAX switch-off and a summary of the most recent outstanding results obtained from the observational studies of the prompt 2–700 keV emission of GRBs detected with BeppoSAX is reported and their impact is discussed
American Clothes: Commerce, Contraband and Purchasers of Used Clothing at the Border between Corumbá, Brasil, and Puerto Quijarro, Bolivia
No full textEste artículo analiza la comercialización y venta de ropa usada en la frontera entre Bolivia y Brasil, la cual atraviesa un proceso de traslado por varios países, medios de transporte, contrabando, reúsos y resignif icación de vestimentas. A f inales del siglo xx, el comercio de ropa usada adquiere mayor importancia con la incorporación de ong norteamericanas y europeas, quienes recaudan estas mercancías en calidad de donativos para reenviarlas y comercializarlas en países sudamericanos. Las ropas usadas realizan extensos recorridos hasta los puertos chilenos, para después iniciar un trayecto por tren, y otros medios de transporte, rumbo al este boliviano fronterizo con Brasil. Puerto Quijarro, Bolivia, y Corumbá, Brasil, representan una experiencia de intercambio cultural y comercial, donde el contrabando y la compra y venta de ropa usada son parte de su interacción cotidiana.This article studies the marketing and sales of used clothing at the border between Bolivia and Brazil. The clothes cross through several countries via various forms of transportation, undergoing processes of smuggling, reuse, and wardrobe redef inition. At the end of the 20th century, the used clothing market acquired major importance through the involvement of North American and European nongovernmental organizations in collecting these goods in the form of donations to then send to South American countries, where the garments are remarketed. The used clothes take long voyages to get to Chilean ports, and then journey by train and other means of transportation toward Bolivia's eastern border with Brazil. Puerto Quijarro, Bolivia, and Corumbá, Brazil, represent an encounter of cultural and commercial exchange where smuggling and the buying and selling of used clothes are part of the cities' day-to-day engagement
Average power density spectrum of long GRBs detected with BeppoSAX/GRBM and with Fermi/GBM
No full textFrom past experiments the average power density spectrum (PDS) of GRBs with unknown redshift was found to be modelled from 0.01 to 1 Hz with a power-law, f^(-alpha), with alpha broadly consistent with 5/3. Recent analyses of the Swift/BAT catalogue showed analogous results in the 15-150 keV band. We carried out the same analysis on the bright GRBs detected by BeppoSAX/GRBM and Fermi/GBM. The BeppoSAX/GRBM data, in the energy range 40-700 keV and with 7.8 and 0.5-ms time resolutions, allowed us to explore for the first time the average PDS at very high frequencies (up to 1 kHz) and reveal a break around 1-2 Hz, previously found in CGRO/BATSE data. The Fermi/GBM data, in the energy band 8-1000 keV, allowed us to explore for the first time the average PDS within a broad energy range. Our results confirm and extend the energy dependence of the PDS slope, according to which harder photons have shallower PDS
Possible physical explanation of the intrinsic Ep,i-“intensity” correlation commonly used to “standardize” GRBs
No full textIt is recognized that very likely the correlation between peak energy Ep and bolometric intensity is intrinsic to GRBs. However, its physical origin is still debated. In this paper, we will discuss a possible interpretation of the correlation in the light of a GRB prompt emission spectral model, GRBCOMP, proposed in [L. Titarchuk, R. Farinelli, F. Frontera and L. Amati, Astrophys. J. 752 (2012) 116]. GRBCOMP is essentially a photospheric model for the prompt emission of GRBs. Its main ingredients are a thermal bath of soft seed photons and a subrelativistically expanding outflow plasma, consequence of the star explosion. The emerging spectrum is the result of two phases: first, up to the photospheric radius, Comptonization of a subrelativistic electron outflow with thermal bath of soft photons, then, convolution of the Comptonized photons in the first phase with a Green function. The result of this convolution is consistent with different physical processes, in particular Inverse Compton. GRBCOMP has been successfully tested using a significant sample of GRB time resolved spectra in the broad energy band from 2keV to 2MeV [F. Frontera, L. Amati, R. Farinelli, S. Dichiara, C. Guidorzi, R. Landi and L. Titarchuk, Astrophys. J. 779 (2013) 175]
The Economically Active Population in Tijuana and that of Mexican Origin in San Diego from 1970 to 2010
No full textThere is a strong cross-border demographic and socioeconomic dynamic between Tijuana and San Diego; job opportunities in San Diego have brought it a growing population of Mexican origin. These two cities' interrelated economies bring about changes in the population and economic activity. This article examines the economic context from 1970 to 2010, including key events such as the Border Industrialization Program, the Simpson-Rodino Act, the North American Free Trade Agreement, and the 2008 f inancial crisis. Tijuana's main employer is manufacturing, while in San Diego services and commerce are the main employersfor workers of Mexican origin, who are increasing their participation in the professional services sector.Tijuana y San Diego forman una frontera de intensa dinámica demográf ica y socioeconómica, con población de origen mexicano creciente en San Diego generada por oportunidades de empleo en esta ciudad. Las economías en interrelación modif ican la población y las ramas de trabajo. Se analiza el contexto económico de 1970 a 2010, incluyendo el Programa de Industrialización Fronteriza, la ley Simpson-Rodino, el Tratado de Libre Comercio de América del Norte y la crisis de 2008. En Tijuana predomina la industria de transformación, mientras que en San Diego los servicios y el comercio requieren trabajadores de origen mexicano, que ahora incrementan su participación en servicios profesionales
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