188,939 research outputs found
Glueball mass estimate from finite temperature SU(2) lattice studies
Full text linkEngels J, Karsch F, Satz H, Montvay I. Glueball mass estimate from finite temperature SU(2) lattice studies. Physics Letters, B. 1981;102(5):332-336
Scaling and asymptotic scaling in the SU(2) gauge theory
Full text linkFingberg J, Heller UM, Karsch F. Scaling and asymptotic scaling in the SU(2) gauge theory. Nuclear Physics, B. 1993;392(2):493-517.We determine the critical couplings for the deconfinement phase transition in SU(2) gauge theory on N(tau) x N(sigma)3 lattices with N(tau) = 8 and 16 and N(sigma) varying between 16 and 48. A comparison with string tension data shows scaling of the ratio T(c)/square-root sigma in the entire coupling regime beta = 2.30-2.75, while the individual quantities still exhibit large scaling violations. We find T(c)/square-root sigma = 0.69(2). We also discuss in detail the extrapolation of T(c)/LAMBDA(MSBAR) and square-root sigma/LAMBDA(MSBAR) to the continuum limit. Our result, which is consistent with the above ratio, is T(c)/LAMBDA(MSBAR) = 1.23(11) and square-root sigma/LAMBDA(MSBAR) = 1.79(12). We also comment upon corresponding results for SU(3) gauge theory and four-flavour QCD
Design and fabrication of an ac-electro-osmosis micropump with 3D high-aspect-ratio electrodes using only SU-8
Full text linkLab-on-a-chip devices require integrated pumping and fluid control in microchannels. A recently developed mechanism that can produce fluid flow is an integrated ac-electro-osmosis micropump. However, like most electrokinetic pumps, ac-electro-osmotic pumps are incapable of handling backpressure as the pumping force mechanism acts on the surface of the fluid rather than the bulk. This paper presents a novel 3D electrode structure designed to overcome this limitation. The electrodes are fabricated using carbon-MEMS technology based on the pyrolysis of the photo-patternable polymer SU-8. The novel ac-electro-osmosis micropump shows an increase in the flow velocity compared to planar electrodes
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
Full text linkFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
High temperature SU(2) gluon matter of the lattice
Full text linkEngels J, Karsch F, Satz H, Montvay I. High temperature SU(2) gluon matter of the lattice. Physics Letters, B. 1981;101(1-2):89-94.We calculate by Monte Carlo simulation on the lattice the energy density [epsilon] of an SU(2) Yang-Mills system at finite physical temperature. First, we study the high temperature form of [epsilon], showing that the conventional euclidean lattice formulation converges to the parameter-free Stefan-Boltzmann limit of a free gluon gas in the continuum. Secondly, we show that the specific heat of gluon matter exhibits a sharp peak at the transition point from the confined phase to the color-screened gluon gas. The resulting transition temperature is found to be 210 ± 10 MeV
J. V. Foix: Avantguarda, poesia i arquitectura. Foix a la V Triennal d’Arquitectura, Milà 1933
Full text linkL'any 1933, en ple periode feixista, el poeta avantguardista català J. V. Foix (1893-1987) visità amb la seua esposa la V Triennal d'arquitectura de Milà. Es tractava d'un viatge prou llarg que, a més de Milà, inclogué, pel que sabem, ciutats d'Itàlia i de Iugoslàvia, com ara Florència, Trieste, Roma, Venècia i Ljubljana. El motiu del desplaçament era l'assistència a l'XIé Congrés Internacional del PEN-Club que se celebrà en la primavera del 1933 a Dubrovnik (població per al nom de la qual Foix prefería fer servir el nom llatí de Ragusa). Aquell viatge motivà un article específic sobre l'arquitectura de la Triennal al diari "La Publicitat", però també diverses referencies posteriors, tant en l'obra periodística com poètica de Foix. Una especial significació tingué el llibre d'articles preparat pel mateix Foix "Mots i maons o a cascu el seu" (1971). En aquest assaig, escrit per professors de la Universitat d'Alacant i del Politècnic de Milà, s'analitza la visió que Foix tenia de l'arquitectura del Moviment Modern, situant-la en relació al seu esperit avantguardista i d'avançada; s'intenten establir dates, llocs i edificis vistos per Foix en aquell viatge; i es conclou subratllant que la proximitat entre Milà i Barcelona que es donà amb intensitat els anys cincuanta i seixanta del segle XX troba en aquest episodi poc conegut de l'època d'entreguerres un antecedent remarcable per a la cultura arquitectònica i literària catalana.In 1933, during the fascist period in Italy, the avant-garde Catalan poet J. V. Foix (1893-1987) visited the V Triennale di Architettura di Milano with his wife. As far as we know, this was a long trip which, apart from Milan, included stays in Yugoslavian and Italian cities like Florence, Trieste, Rome, Venice and Ljubljana. The reason for the journey was to attend the 11th International Congress of the PEN-Club which was held in spring 1933 in Dubrovnik, a town which Foix preferred to call by its Latin name Ragusa. That trip was the source of a monographic article about the architecture of the Triennale published in the newspaper “La Publicitat”, but it was also the source of later references both in his journalistic and poetic works. The book of articles prepared by Foix himself "Mots i maons o a cascú el seu" (1971) - that we can translate as “Bricks and Words or each to their own” - would have a special significance. This essay, written by lecturers from Alicante University ant the Polytechnic of Milan, analyzes Foix vision of the architecture of the Modern Movement, placing it in the context of his profound avant-garde and advanced spirit. It aims to establish the facts, places and buildings visited by Foix during that trip. The conclusion is that this little known episode between the wars was a remarkable antecedent for the proximity between Milan and Barcelona, which was so intense in the fifties and sixties, and had a great influence on Catalan culture and architecture
Genetic risk and a primary role for cell-mediated immune mechanisms in multiple sclerosis
Full text linkMultiple sclerosis is a common disease of the central nervous system in which the interplay between inflammatory and neurodegenerative processes typically results in intermittent neurological disturbance followed by progressive accumulation of disability. Epidemiological studies have shown that genetic factors are primarily responsible for the substantially increased frequency of the disease seen in the relatives of affected individuals, and systematic attempts to identify linkage in multiplex families have confirmed that variation within the major histocompatibility complex (MHC) exerts the greatest individual effect on risk. Modestly powered genome-wide association studies (GWAS) have enabled more than 20 additional risk loci to be identified and have shown that multiple variants exerting modest individual effects have a key role in disease susceptibility. Most of the genetic architecture underlying susceptibility to the disease remains to be defined and is anticipated to require the analysis of sample sizes that are beyond the numbers currently available to individual research groups. In a collaborative GWAS involving 9,772 cases of European descent collected by 23 research groups working in 15 different countries, we have replicated almost all of the previously suggested associations and identified at least a further 29 novel susceptibility loci. Within the MHC we have refined the identity of the HLA-DRB1 risk alleles and confirmed that variation in the HLA-A gene underlies the independent protective effect attributable to the class I region. Immunologically relevant genes are significantly overrepresented among those mapping close to the identified loci and particularly implicate T-helper-cell differentiation in the pathogenesis of multiple sclerosis
Expression of Growth-Related Genes and Drug-Resistance Genes in HTLV-I-Positive and HTLV-I-Negative Post-Thymic T-Cell Malignancies
No full textMeasurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
Full text linkThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Measurement of the time-dependent CP asymmetry in B0 -> J/ψ KS0 decays
Full text linkThis Letter reports a measurement of the CP violation observables SJ/ψK0S and CJ/ψK0S in the decay channel B0→J/ψK0S performed with 1.0 fb−1 of pp collisions at s√=7 TeV collected by the LHCb experiment. The fit to the data yields SJ/ψK0S=0.73±0.07(stat)±0.04(syst) and CJ/ψK0S=0.03±0.09(stat)±0.01(syst). Both values are consistent with the current world averages and within
expectations from the Standard Model
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