4,727 research outputs found

    On the reflection and transmission of circumferential waves through nozzles

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    Anomalous resonant production of the fourth family up type quarks at the LHC

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    Considering the present limits on the masses of fourth family quarks from the Tevatron experiments, the fourth family quarks are expected to have mass larger than the top quark. Due to their expected large mass they could have different dynamics than the quarks of three families of the Standard Model. The resonant production of the fourth family up type quark t' has been studied via anomalous production subprocess gq_i-->t' (where q_i=u,c) at the LHC with the center of mass energy 10 TeV and 14 TeV. The signatures of such process are discussed within the SM decay modes. The sensitivity to anomalous coupling \kappa/\Lambda=0.1 TeV^(-1) can be reached at \sqrt{s}=10 TeV and L_int=100 pb^(-1).Comment: 14 pages, 13 figures, 7 table

    Josep de C. Serra i Ràfols: una vida de fidelitat i dedicació al patrimoni arqueològic de Catalunya. L'exemple de la Baetulo romana

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    Les intervencions de Josep de C. Serra Ràfols a l'arqueologia badalonina al llarg de gairebé mig segle són molt paradigmàtiques de la seva valuosa i extensa contribució a l'arqueologia catalana. La seva dedicació a la Baetulo romana es va iniciar en els anys vint amb el primer fascicle de la Forma Conventus Tarraconensis, el Baetulo-Blanda, i amb l'estudi arqueològic de la casa romana del carrer Lladó; va continuar en els anys de la República amb les importants excavacions al Clos de la Torre, el punt neuràlgic d'aquell jaciment; i va culminar, ja en els difícils anys de la postguerra, amb el seu suport decisiu per a la salvaguarda i l'explotació científica del patrimoni arqueològic d'aquella ciutat romana. Les importants realitzacions i les potencialitats futures de l'arqueologia i de la museografia de la Badalona actual no haurien estat possibles sense la tenacitat i la dedicació del valuós arqueòleg a qui dediquem aquest homenatge.The involvement of Josep de C. Serra Ràfols in Badalona’s archaeology over almost half a century is highly paradigmatic of his valuable and extensive contribution to Catalan archaeology. His dedication to Roman Baetulo started in the 1920s with the first issue of the Forma Conventus Tarraconensis, the Baetulo-Blanda, and with the archaeological study of the Roman house on Lladó street, continuing in the years of the Republic with important excavations at Clos de la Torre, the focal point for that site, and culminating in the difficult post-war years with his decisive support to afeguard and scientifically explore the archaeological heritage of that Roman city. The important work achieved and future potential of today’s Badalona in archaeological and museum terms would not be possible without the tenacity and dedication of the valuable archaeologist we are paying homage to

    Els Orígens de Sant Joan de les Abadesses

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    Recursos i restriccions de la xarxa en ciències biomèdiques

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    La xarxa Internet, entesa com un consorci format per usuaris, ordinadors, elements de comunicació, coneixements i aplicacions, és una innovació tecnològica que obre la porta a noves modalitats de treball i de relació entre les persones i les organitzacions en què estan agrupades. En el cas de les ciències biomèdiques, una gran part del seu èxit rau a oferir un substrat metodològic molt adient a la necessitat intrínseca de tractar dades i informacions i comunicar-les a d'altres professionals perquè la recerca progressi o a la societat per a difondre els coneixements. La medicina es beneficia en el mateix sentit, però l'impacte és mes gran, ja que hom pot preveure un canvi radical en el paradigma de l'actuació clínica. La clàssica relació metge-pacient haurà d'incorporar nous elements amb el grau de responsabilitat corresponent. Cal acceptar el fet d'Internet amb un esperit científic alhora suficientment crític per a copsar tots els beneficis que se'n poden obtenir i totes les restriccions i limitacions que per raons tècniques o ètiques s'hagin d'acceptar.The Internet, understood as a global consortium formed by users, computers, communication elements and applications, is a technical innovation which opens the door toward new ways of working and relationship among people and organizations where they are grouped. In biomedical science, the reason for the success lies in the offer of a methodological substrate highly convenient to the intrinsic need to manage data and information and communicate them to other professionals by reasons of progress in research or to the society in order to distribute the knowledge. The Medicine gets the same profits, but the impact is greater because it is envisaged a radical change in the clinical paradigm. The classic relationship physician-patient shall need the incorporation of new elements with their corresponding degree of responsibility. The Internet irruption in the current life must be accepted in a scientific spirit with enough criticism to extract all the benefits and to accept all the limitations and restrictions imposed by technical problems or ethical reasons

    The origin of the earliest Roman cities in Catalonia : an examination from the perspective of archaeology

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    In recent decades, the progress in archaeology applied to knowledge of the Roman cities in the Catalan-speaking lands has begun to furnish a new perspective on the question of the origins of these cities. In this article, which focuses on Catalonia, and in the one planned for the next issue focusing on Valencia, we shall examine this topic, which also provides valuable information on the Romans' earliest presence here. With just a handful of exceptions, the majority of Roman cities documented in Catalonia were newly founded by the Romans. With them, a network of new cities was built that had a profound influence on the process of Romanisation that had gotten underway during the Second Punic War and culminated at the end of the Republican period with the founding of Barcino, the predecessor of today's Barcelona. The archaeological information provided by the cities of Tarraco, Baetulo, Iluro, Iesso, Aeso, Gerunda and Roman Emporiae, among others, furnish fragmentary yet highly significant information that enables us to fine-tune the chronologies of their starting dates and the characteristics of their earliest development with regard to the historical context of the time, which unquestionably marked the first steps in their formation as cities. The early years of the 1st century AD were particularly dynamic in terms of this urbanising activity, which was most likely not just inspired but also planned by the Roman authorities. The new cities, with their regular layouts in rigorously orthogonal grids and their fortified remises, brought to Catalonia the urban models that the Romans had developed during their years of expansion around the Italian peninsula. Along with the construction of the roadway network, they would lay the foundations for the structure of the country, which would mark the entire Roman period and largely remain in place in the subsequent centuries and even until today
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