WaveMIMO Methodology : Numerical Wave Generation of a Realistic Sea State

This paper presents a methodology that allows the numerical simulation of realistic sea waves, called WaveMIMO methodology, which is based on the imposition of transient discrete data as prescribed velocity on a finite volume computational model developed in Fluent software. These transient data are obtained by using the spectral wave model TOMAWAC, where the wave spectrum is converted into a series of free surface elevations treated and processed as wave propagation velocities in the horizontal (x) and vertical (z) directions. The processed discrete transient data of wave propagation velocity are imposed as boundary conditions of a wave channel in Fluent, allowing the numerical simulation of irregular waves with realistic characteristics. From a case study that reproduces the sea state occurring on March 31st, 2014, in Ingleses Beach, in the city of Florianópolis, state of Santa Catarina, Brazil, it was concluded that the WaveMIMO methodology can properly reproduce realistic conditions of a sea state. In sequence, the proposed methodology was employed to numerically simulate the incidence of irregular realistic waves over an oscillating water column (OWC) wave energy converter (WEC). From these results, the WaveMIMO methodology has proved to be a promising technique to numerically analyze the fluid-dynamic behavior of WECs subjected to irregular waves of realistic sea state on any coastal region where the device can be installed

COMO A MANIPULAÇÃO DAS REGRAS IMPACTA O PADRÃO DE COORDENAÇÃO INTERPESSOAL DE EQUIPES COMPOSTAS POR JOGADORES COM DIFERENTES NÍVEIS DE DESEMPENHO TÁTICO?

This study aimed to investigate the impact of rules manipulation on the interpersonal coordination pattern of teams in Small-Sided and Conditioned Games (SSCG) in soccer. Twenty-four U-15 and U-17 players participated in the study and were divided into three groups according to their tactical skills (TS). Teams’ interpersonal coordination patterns were evaluated using the following networks metrics: Density (homogeneity of interactions), Clustering (creation of subgroups of players), Indegree (passes received), Outdegree (passes made), total links (total interactions established) and Eigenvector (player who collaborates most with the team's exchange of passes). The players with lower TS showed higher values in the global metrics in Structural SSCGs, and in the individual metrics the players with greater TS performed better in both games. The Structural SSCG stimulate the players with lower TS to play more collectively.Este estudio tuvo como objetivo investigar el impacto de la manipulación de las reglas en el patrón de coordinación interpersonal de los equipos en Juegos Reducidos y Condicionados en el fútbol. Participaron 24 futbolistas de las categorías sub-15 y sub-17, divididos en tres grupos según su nivel de rendimiento táctico (RT). El patrón de coordinación interpersonal se evaluó a través de las métricas: densidad (homogeneidad de las interacciones), Clustering (creación de subgrupos), Indegree (pases recibidos), Outdegree (pases realizados), total de enlaces (total de interacciones) y Eigenvector (jugador que más colabora con el intercambio de pases). Los jugadores menos RT presentaron en las métricas globales valores más altos en las medidas de Densidad y Clustering en los Juegos Estructurales y en las métricas individuales los jugadores más RT se desempeñaron mejor en ambos juegos. Los Juegos Estructurales, estimulan a los jugadores menos RT a jugar más colectivamente.Este estudo teve como objetivo investigar o impacto da manipulação das regras sobre o padrão de coordenação interpessoal das equipes em Jogos Reduzidos e Condicionados no futebol. Participaram do estudo 24 futebolistas da categoria Sub-15 e Sub-17, sendo estes divididos em três grupos, de acordo com seus níveis de desempenho tático (DT). O padrão de coordenação interpessoal foi avaliado por meio das métricas de Densidade (homogeneidade de interações), Clustering (criação de sub-grupos de jogadores), Indegree (passes recebidos), Outdegree (passes realizados), total de links (total de interações estabelecidas) e Eigenvector (jogador que mais colabora com a troca de passes da equipe). Os jogadores com menor DT apresentaram nas métricas globais valores maiores nas medidas de Densidade e Clustering nos Jogos Estruturais, e nas métricas individuais os jogadores com maior DT tiveram melhor desempenho nos dois jogos. Os Jogos Estruturais estimulam os jogadores com menor DT a jogarem mais coletivamente

Estudo da usinagem com ferramentas cerâmicas de Si3 N4 revestida com diamante

A crescente evolução das indústrias automobilísticas vem estimulando cada vez mais a competitividade no mercado. Alguns fatos são determinantes para o sucesso dessas empresas, como, a redução da polui- ção, design, melhoria do tempo de vidas das peças, redução de custo de manufaturas, entre outros. Para tal melhoria, as empresas tiveram como necessidade, investimentos em pesquisas e equipamentos. Um dos processos mais difícil é a usinagem dos blocos de motores, que normalmente são fabricados de ferro fundido cinzento (GCI), ferro fundido vermicular (CGI), e outros que apresenta baixa usinabilidade, promovendo elevado gasto com ferramentas, alem de tempos improdutivos utilizados para trocas das ferramentas e averiguação. A necessidade vigente, dessas indústrias tem levado, e motivado pesquisas em desenvolvimento e revestimento de ferramentas cerâmicas. Entre as ferramentas mais promissoras para usinagem das ligas utilizadas nos blocos de motores estão as ferramentas cerâmicas de nitreto de silício (Si3 N4 ). Essas ferramentas oferecem uma combinação única de propriedades, como resistência mecânica à altas temperaturas, resistência a ataque químico e abrasão, leveza, dentre outras. Neste trabalho serão utilizadas ferramentas cerâ- micas à base de (Si3 N4 ) revestidas com diamante pelo processo CVD no torneamento do ferro fundido cinzento nas velocidades de corte de 180, 240, 300 e 360 m/min., com avanço variando de 0,12 à 0,40 mm/rot. e profundidade de corte constante de 1.0 mm. Os resultados mostraram que a Vc =300m/min e f=0,33 mm/rot promoverão importantes reduções das forças de corte, menor rugosidade da peça e comprimento de corte de 7883m. Esses resultados são promissores, e mostram a importância da otimização dos parâmetros da usinagem

Planos alimentares no consumo, na digestibilidade e no desempenho de novilhas leiteiras de distintos grupos raciais

The objective of this work was to evaluate the effects of nutritional plans and breed composition on nutrient intake and digestibility, nitrogen balance, and performance of dairy heifers in tropical conditions. Thirty-six heifers – 12 Holstein, 12 Gyr, and 12 Gyrolando F1 (½ Holstein × ½ Gyr) – were housed in a tie-stall system and randomly distributed, adopting a completely randomized design in a 3×3 factorial arrangement (nutritional plans and breed composition). The diets were formulated to enable weight gains of 200, 400, and 800 g per day, corresponding to the nutritional plans 11, 14, and 19 g kg-1 body weight (BW), respectively. The intake of dry matter, fibrous fractions (g kg-1 BW-0.75), and metabolizable energy (kcal-1 BW-0.75) in the 11-g kg-1 plan were greater for Gyr heifers than for Gyrolando and Holstein heifers. Ether extract digestibility was 13.85% higher for Gyr heifers compared with Gyrolando F1 in the 19-g kg-1 plan. The increase in the nutritional plans shows a quadratic response to nutrient intake and a linear response to average daily gain, but does not affect the digestibility coefficients. Gyr and Gyrolando F1 heifers present similar nutritional efficiency to that of Holstein heifers.O objetivo deste trabalho foi avaliar os efeitos do plano alimentar e do grupo racial sobre o consumo e a digestibilidade de nutrientes, o balanço de nitrogênio e o desempenho de novilhas leiteiras em condições tropicais. Trinta e seis novilhas – 12 Holandês, 12 Gir e 12 Girolando F1 (½ Holandês × ½ Gir) – foram alojadas em sistema “tie-stall” e distribuídas aleatoriamente, tendo-se adotado delineamento inteiramente casualizado, em arranjo fatorial 3x3 (planos alimentares e grupos raciais). As dietas foram formuladas para possibilitar ganhos de peso de 200, 400 e 800 g por dia, correspondentes aos planos alimentares de 11, 14 e 19 g kg-1 de peso corporal (PC), respectivamente. As novilhas Gir dentro do plano de 11 g kg-1 consumiram mais matéria seca, fração fibrosa (g kg-1 de PC-0,75) e energia metabolizável (kcal de PC-0,75) do que as novilhas Girolando e Holandês. A digestibilidade do extrato etéreo foi 13,85% superior para as novilhas Gir, em comparação às Girolando F1 no plano de 19 g kg-1. O aumento do plano nutricional tem efeito quadrático no consumo de nutrientes e linear no ganho de peso médio diário, mas não influencia o coeficiente de digestibilidade. Novilhas Gir leiteiras e Girolando F1 apresentam eficiência nutricional semelhante à das novilhas Holandês

Search for events with large missing transverse momentum, jets, and at least two tau leptons in 7 TeV proton–proton collision data with the ATLAS detector

A search for events with large missing transverse momentum, jets, and at least two tau leptons has been performed using 2 fb^-1 of proton-proton collision data at sqrt(s) = 7 TeV recorded with the ATLAS detector at the Large Hadron Collider. No excess above the Standard Model background expectation is observed and a 95% CL visible cross section upper limit for new phenomena is set. A 95% CL lower limit of 32 TeV is set on the GMSB breaking scale Lambda independent of tan(beta). These limits provide the most stringent tests to date in a large part of the considered parameter space.Peer Reviewe

Search for extra dimensions using diphoton events in 7 TeV proton–proton collisions with the ATLAS detector

Using data recorded in 2011 with the ATLAS detector at the Large Hadron Collider, a search for evidence of extra spatial dimensions has been performed through an analysis of the diphoton final state. The analysis uses data corresponding to an integrated luminosity of 2.12 fb^-1 of sqrt(s) = 7 TeV proton-proton collisions. The diphoton invariant mass spectrum is observed to be in good agreement with the expected Standard Model background. In the large extra dimension scenario of Arkani-Hamed, Dimopoulos and Dvali, the results provide 95% CL lower limits on the fundamental Planck scale between 2.27 and 3.53 TeV, depending on the number of extra dimensions and the theoretical formalism used. The results also set 95% CL lower limits on the lightest Randall-Sundrum graviton mass of between 0.79 and 1.85 TeV, for values of the dimensionless coupling k/\bar{M}_{Pl} varying from 0.01 to 0.1. Combining with previously published ATLAS results from the dielectron and dimuon final states, the 95% CL lower limit on the Randall-Sundrum graviton mass for k/\bar{M}_{Pl} = 0.01 (0.1) is 0.80 (1.95) TeV.Peer Reviewe

Measurement of D∗+/−D^{*+/-} meson production in jets from pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

This paper reports a measurement of D*+/- meson production in jets from proton-proton collisions at a center-of-mass energy of sqrt(s) = 7 TeV at the CERN Large Hadron Collider. The measurement is based on a data sample recorded with the ATLAS detector with an integrated luminosity of 0.30 pb^-1 for jets with transverse momentum between 25 and 70 GeV in the pseudorapidity range |eta| D0pi+, D0 -> K-pi+, and its charge conjugate. The production rate is found to be N(D*+/-)/N(jet) = 0.025 +/- 0.001(stat.) +/- 0.004(syst.) for D*+/- mesons that carry a fraction z of the jet momentum in the range 0.3 < z < 1. Monte Carlo predictions fail to describe the data at small values of z, and this is most marked at low jet transverse momentum.Peer Reviewe

Jet energy measurement with the ATLAS detector in proton-proton collisions at s=7\sqrt{s}=7 TeV

The jet energy scale (JES) and its systematic uncertainty are determined for jets measured with the ATLAS detector at the LHC in proton-proton collision data at a centre-of-mass energy of sqrt(s) = 7 TeV corresponding to an integrated luminosity of 38 inverse pb. Jets are reconstructed with the anti-kt algorithm with distance parameters R=0.4 or R=0.6. Jet energy and angle corrections are determined from Monte Carlo simulations to calibrate jets with transverse momenta pt > 20 GeV and pseudorapidities eta 50 GeV after a dedicated correction for this effect. The JES is validated for jet transverse momenta up to 1 TeV to the level of a few percent using several in situ techniques by comparing a well-known reference such as the recoiling photon pt, the sum of the transverse momenta of tracks associated to the jet, or a system of low-pt jets recoiling against a high-pt jet. More sophisticated jet calibration schemes are presented based on calorimeter cell energy density weighting or hadronic properties of jets, providing an improved jet energy resolution and a reduced flavour dependence of the jet response. The JES systematic uncertainty determined from a combination of in situ techniques are consistent with the one derived from single hadron response measurements over a wide kinematic range. The nominal corrections and uncertainties are derived for isolated jets in an inclusive sample of high-pt jets.Peer Reviewe

Search for pair production of a heavy up-type quark decaying to a W boson and a b quark in the lepton+jets channel with the ATLAS detector

A search is presented for production of a heavy up-type quark (t') together with its antiparticle, assuming subsequent decay to a W boson and a b quark, t't'bar -> W+b W-bbar. The search is based on 1.04 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV collected by the ATLAS detector at the CERN Large Hadron Collider. Data are analyzed in the lepton+jets final state, characterized by a high transverse momentum isolated electron or muon, high missing transverse momentum and at least three jets. No significant excess of events above the background expectation is observed. A 95% C.L. lower limit is set at m(t') > 404 GeV.Peer Reviewe