661 research outputs found
Herwig++ 2.0 Release Note
A new release of the Monte Carlo program Herwig++ (version 2.0) is now
available. This is the first version of the program which can be used for
hadron-hadron physics and includes the full simulation of both initial- and
final-state QCD radiation.Comment: Source code and additional information available at
http://hepforge.cedar.ac.uk/herwig
Low-cost electromagnetic tagging : design and implementation
Thesis (Ph. D.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2002.Includes bibliographical references (p. 220-222).Several implementations of chipless RFID (Radio Frequency Identification) tags are presented and discussed as low-cost alternatives to chip-based RFID tags and sensors. An overview of present-day near-field electromagnetic tagging is presented, including both chip-based and chipless technologies with associated costs. As a candidate for low-cost ID tags, a design theory and implementation is presented for multiply-resonant planar metal structures. This theory includes a circuit model, a phenomenological model, and a framework for predicting the resonant frequencies as a function of geometrical and material properties. A novel physical geometry, a tree-like spiral structure, is proposed as a design that increases the number of resonances per unit area in a planar structure relative to the present day state-of-the-art. In addition to identification, it is shown how several chipless tags can also be designed to function as sensors. Several examples are discussed in detail, including: 1) a family of thermal sensor tags employing magnetic materials and 2) a family of sensor tags (to sense pressure, humidity, and pH) based on planar resonator structures. The latter section of the dissertation describes the evolution of my work in developing the necessary (and low-cost) instrumentation to support these new varieties of tag technologies, ranging from a 5 reader for toy applications.by Richard Ribon Fletcher.Ph.D
A low-cost electromagnetic tagging technology for wireless identification, sensing, and tracking of objects
Thesis (M.S.)--Massachusetts Institute of Technology, Program in Media Arts & Sciences, 1997.Includes bibliographical references (leaf 82).by Richard Ribon Fletcher.M.S
SystĂšme dâInformation pour lâAnalyse du MĂ©tabolisme Territorial (SINAMET)
Les Ă©tudes de mĂ©tabolisme territorial, c'est-Ă -dire l'analyse des flux de matiĂšres et d'Ă©nergie mobilisĂ©s par le systĂšme socio-Ă©conomique d'un territoire, permettent d'obtenir des informations pertinentes pour Ă©valuer l'impact de nos sociĂ©tĂ©s sur l'environnement. Mais de telles Ă©tudes sont longues et complexes Ă rĂ©aliser : Les donnĂ©es Ă mobiliser et Ă traiter sont nombreuses et dispersĂ©es, et les rĂ©sultats peuvent ĂȘtre difficilement apprĂ©hendables. La façon de visualiser les informations sur le mĂ©tabolisme est ainsi un Ă©lĂ©ment important des Ă©tudes, le but Ă©tant de correspondre aux diffĂ©rents besoins des acteurs territoriaux. Les techniques de traitement des donnĂ©es Ă©tant jusqu'Ă prĂ©sent essentiellement manuelles, nous prĂ©sentons un SystĂšme d'INformation pour l'Analyse du MEtabolisme Territorial (SINAMET) qui a pour objectif de faciliter lâautomatisation des traitements de donnĂ©es afin de rendre les rĂ©sultats des Ă©tudes plus accessibles.
Le SINAMET sâadresse Ă plusieurs profils dâusagers, allant du simple nĂ©ophyte curieux des rĂ©sultats finaux, jusquâĂ des utilisateurs plus familier du traitement de donnĂ©es, qui pourront facilement implĂ©menter leurs mĂ©thodes de traitement grĂące Ă des fonctionnalitĂ©s gĂ©nĂ©riques intĂ©grĂ©es dans le systĂšme dâinformation en cours de dĂ©veloppement.
Le SINAMET se base sur une architecture logicielle structurĂ©e autour d'un noyau logiciel et pouvant ĂȘtre enrichit de modules dĂ©diĂ©s aux opĂ©rations dâimportations, de traitement ou d'exportation/visualisation des donnĂ©es. Le systĂšme dâinformation inclut Ă©galement une base de donnĂ©es structurĂ©e selon une ontologie voulue simple mais fonctionnelle pour agrĂ©ger un grand nombre de donnĂ©es sur le mĂ©tabolisme. Les notions de Territoire, Acteur, Flux, Stock, Omes (Objet/MatiĂšre/Energie/Service) et Transformation sont Ă©tablies comme base conceptuelle permettant de manipuler l'information. Ce paradigme est renforcĂ© par l'utilisation d'un mapping objet-relationnel (ORM) permettant d'abstraire la gestion d'une base de donnĂ©es, au profit dâune approche orientĂ© objet. Les futures contributions pourront ainsi se concentrer sur le dĂ©veloppement dâalgorithmes de traitement de donnĂ©es et enrichir ainsi les fonctionnalitĂ©s du SINAMET.
L'approche prĂ©sentĂ©e a Ă©tĂ© partiellement concrĂ©tisĂ©e Ă travers un prototype, une version alpha 0.1, qui a fourni des premiers rĂ©sultats que nous prĂ©sentons. Les travaux doivent ĂȘtre cependant poursuivis pour rendre rĂ©ellement opĂ©rationnelle la solution logicielle. Notamment, la crĂ©ation d'une communautĂ© autour du projet semble un point nĂ©cessaire pour son dĂ©veloppement.
Les futurs avancements du projet seront communiquĂ©s Ă lâadresse : https://metabolisme-territorial.fr/wiki/index.php/Siname
Spatial determinants of specificity in insulin action
Insulin is a potent stimulator of intermediary metabolism, however the basis for the remarkable specificity of insulin's stimulation of these pathways remains largely unknown. This review focuses on the role compartmentalization plays in insulin action, both in signal initiation and in signal reception. Two examples are discussed: (1) a novel signalling pathway leading to the phosphorylation of the caveolar coat protein caveolin, and (2) a recently identified scaffolding protein, PTG, involved directly in the regulation of enzymes controlling glycogen metabolism.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/45334/1/11010_2004_Article_156837.pd
Heavy Flavours in Collider Experiments
Current issues in the studies of Heavy Flavours in colliders are described
with particular emphasis on experiments in which the UK is involved. Results on
charm production at HERA are examined and compared to those at the Tevatron. B
production rates at the Tevatron as well as the status of B lifetimes and
mixing in the LEP collaborations and at the Tevatron are highlighted. The
measurement of sin2beta from CDF is described as well as the most recent
results on top physics at the Tevatron
A Novel, Multifunctional c-Cbl Binding Protein in Insulin Receptor Signaling in 3T3-L1 Adipocytes
The protein product of the c-Cbl proto-oncogene is prominently tyrosine phosphorylated in response to insulin in 3T3-L1 adipocytes and not in 3T3-L1 fibroblasts. After insulin-dependent tyrosine phosphorylation, c-Cbl specifically associates with endogenous c-Crk and Fyn. These results suggest a role for tyrosine-phosphorylated c-Cbl in 3T3-L1 adipocyte activation by insulin. A yeast two-hybrid cDNA library prepared from fully differentiated 3T3-L1 adipocytes was screened with full-length c-Cbl as the target protein in an attempt to identify adipose-specific signaling proteins that interact with c-Cbl and potentially are involved in its tyrosine phosphorylation in 3T3-L1 adipocytes. Here we describe the isolation and the characterization of a novel protein that we termed CAP for c-Cbl-associated protein. CAP contains a unique structure with three adjacent Src homology 3 (SH3) domains in the C terminus and a region showing significant sequence similarity with the peptide hormone sorbin. Both CAP mRNA and proteins are expressed predominately in 3T3-L1 adipocytes and not in 3T3-L1 fibroblasts. CAP associates with c-Cbl in 3T3-L1 adipocytes independently of insulin stimulation in vivo and in vitro in an SH3-domain-mediated manner. Furthermore, we detected the association of CAP with the insulin receptor. Insulin stimulation resulted in the dissociation of CAP from the insulin receptor. Taken together, these data suggest that CAP represents a novel c-Cbl binding protein in 3T3-L1 adipocytes likely to participate in insulin signaling
GeantV: Results from the prototype of concurrent vector particle transport simulation in HEP
Full detector simulation was among the largest CPU consumer in all CERN
experiment software stacks for the first two runs of the Large Hadron Collider
(LHC). In the early 2010's, the projections were that simulation demands would
scale linearly with luminosity increase, compensated only partially by an
increase of computing resources. The extension of fast simulation approaches to
more use cases, covering a larger fraction of the simulation budget, is only
part of the solution due to intrinsic precision limitations. The remainder
corresponds to speeding-up the simulation software by several factors, which is
out of reach using simple optimizations on the current code base. In this
context, the GeantV R&D project was launched, aiming to redesign the legacy
particle transport codes in order to make them benefit from fine-grained
parallelism features such as vectorization, but also from increased code and
data locality. This paper presents extensively the results and achievements of
this R&D, as well as the conclusions and lessons learnt from the beta
prototype.Comment: 34 pages, 26 figures, 24 table
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