Resultados objetivos, subjetivos y funcionales a largo plazo de la reconstrucción de ligamento cruzado anterior mediante plastia hueso-tendón-hueso patelar autóloga

Tesis doctoral inédita realizada en la Universidad Autónoma de Madrid, Facultad de Medicina, Departamento de Cirugía. Fecha de lectura: 2 Julio de 2010

Cretacic pedogenesis and red beds formation in the Minas Gerais triangle

Orientador: Francisco Sergio Bernardes LadeiraDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de GeociênciasResumo: A Formação Marília (Maastrichtiano) ocupa o topo da coluna estratigráfica da Bacia Bauru e vem sendo objeto de consideráveis estudos ao longo das últimas décadas. Esta formação aflora em diferentes estados da porção centro-sul do território nacional e tem como característica a presença de diversos paleossolos intercalados com as rochas sedimentares. Este estudo esta centrado principalmente nos paleossolos (e seus materiais parentais) existentes em afloramentos localizados no oeste de Minas Gerais (Triângulo Mineiro), entre os municípios de Campina Verde e Gurinhatã. A sedimentação varia entre eólica e aluvial nos diferentes afloramentos, sendo que praticamente a totalidade destes é de coloração vermelha, o que os caracteriza como Red beds. A coloração avermelhada se deve a fina camada de hematita que recobre completamente os grãos das rochas e dos paleossolos, sendo que nos paleossolos os poros são preenchidos por argila iluvial e sedimentada na forma de ferriargilãs, muitas vezes com marcas de dessecação. Estas características evidenciam a presença de água no ambiente e o processo de evapotranspiração que se deu no local. O processo de iluviação da argila formada nos paleossolos é então o responsável por cobrir os grãos dos arenitos com a fina camada de hematita que colore os Red Beds da Formação Marília na regiãoAbstract: The Marília Formation (Maastrichtian) occupies the top of the Bauru Basin estratigraphic column and it has been the subject of considerable studies over the past decades. This formation outcrops in different states of the Brazil¿s south-central portion and its main characteristic is then presence of many interleaved paleosols with sedimentary rocks. This study is about mainly the paleosols (and their parent meterials) contained in outcrops located in the west region of Minas Gerais (this region is called "Triângulo Mineiro"), between the cities of Campina Verde and Gurinhatã. Sedimentation ranges from eolic and alluvial in different outcrops, and almost all of them presents red color, which characterizes them as Red beds. The red color is due to the fine hematite layer that covers the rock and paleosol grains, wherein the paleosol pores are filled by iluvial clay and sedimentated as cutans, often with dissection brands. The characteristics show the water presence on the environment and the evapotranspiration process that has occurred on this place. The iluvial process of the clay formed in paleosols is responsible for the covering of the sandstone grains with the fine hematite layer that colors the Red beds of the Marília Formation in that regionMestradoAnálise Ambiental e Dinâmica TerritorialMestre em Geografi

First measurement of the K−n →Λπ−non-resonant transition amplitude below threshold

We present the analysis of K−absorption processes on He4 leading to Λπ−final states, measured with the KLOE spectrometer at the DAΦNE e+e−collider and extract, for the first time, the modulus of the non-resonant K−n →Λπ−direct production amplitude about 33 MeV below the K‾N threshold. This analysis also allows to disentangle the K−nuclear absorption at-rest from the in-flight capture, for K−momenta of about 120 MeV. The data are interpreted with the help of a phenomenological model, and the modulus of the non-resonant K−n →Λπ−amplitude for K−absorption at-rest is found to be |AK−n→Λπ−|=(0.334±0.018stat−0.058+0.034syst)fm

Determination of ππ\pi\pi scattering lengths from measurement of π+π−\pi^+\pi^- atom lifetime

The DIRAC experiment at CERN has achieved a sizeable production of $\pi^+\pi^-$ atoms and has significantly improved the precision on its lifetime determination. From a sample of 21227 atomic pairs, a 4% measurement of the S-wave $\pi\pi$ scattering length difference $|a_0-a_2| = (.0.2533^{+0.0080}_{-0.0078}|_\mathrm{stat}.{}^{+0.0078}_{-0.0073}|_\mathrm{syst})M_{\pi^+}^{-1}$ has been attained, providing an important test of Chiral Perturbation Theory.Comment: 6 pages, 6 figure

Detection of π+π−\pi^+\pi^-atoms with the DIRAC spectrometer at CERN

The goal of the DIRAC experiment at CERN is to measure with high precision the lifetime of the $\pi^+\pi^-$ atom ($A_{2\pi}$), which is of order $3\times10^{-15}$ s, and thus to determine the s-wave $\pi\pi$-scattering lengths difference $|a_{0}-a_{2}|$. $A_{2\pi}$ atoms are detected through the characteristic features of $\pi^+\pi^-$ pairs from the atom break-up (ionization) in the target. We report on a first high statistics atomic data sample obtained from p Ni interactions at 24 GeV/$c$ proton momentum and present the methods to separate the signal from the background.Comment: 19 pages, 12 figures, 1 tabl

DIRAC: A High Resolution Spectrometer for Pionium Detection

The DIRAC spectrometer has been commissioned at CERN with the aim of detecting $\pi^+ \pi^-$ atoms produced by a 24 GeV/$c$ high intensity proton beam in thin foil targets. A challenging apparatus is required to cope with the high interaction rates involved, the triggering of pion pairs with very low relative momentum, and the measurement of the latter with resolution around 0.6 MeV/$c$. The general characteristics of the apparatus are explained and each part is described in some detail. The main features of the trigger system, data-acquisition, monitoring and setup performances are also given.Comment: 49 pages, 37 figures. Figures 1, 2, 5 and 28 are removed because of size limitations imposed by hep-ex. They don't offer essential information. Latex class file 'elsart.cls' also provide

First measurement of the π+π−\pi^+\pi^- atom lifetime

The goal of the DIRAC experiment at CERN (PS212) is to measure the $\pi^+\pi^-$ atom lifetime with 10% precision. Such a measurement would yield a precision of 5% on the value of the $S$-wave $\pi\pi$ scattering lengths combination $|a_0-a_2|$. Based on part of the collected data we present a first result on the lifetime, $\tau=[2.91 ^{+0.49}_{-0.62}]\times 10^{-15}$ s, and discuss the major systematic errors. This lifetime corresponds to $|a_0-a_2|=0.264 ^{+0.033}_{-0.020} m_{\pi}^{-1}$.Comment: 18 pages, 6 figure

Evidence for πK\pi K-atoms with DIRAC

We present evidence for the first observation of electromagnetically bound $\pi^\pm K^\mp$-pairs ($\pi K$-atoms) with the DIRAC experiment at the CERN-PS. The $\pi K$-atoms are produced by the 24 GeV/c proton beam in a thin Pt-target and the $\pi^\pm$ and $K^\mp$-mesons from the atom dissociation are analyzed in a two-arm magnetic spectrometer. The observed enhancement at low relative momentum corresponds to the production of 173 $\pm$ 54 $\pi K$-atoms. The mean life of $\pi K$-atoms is related to the s-wave $\pi K$-scattering lengths, the measurement of which is the goal of the experiment. From these first data we derive a lower limit for the mean life of 0.8 fs at 90% confidence level.Comment: 15 pages, 9 figure

First measurement of Ξc0 production in pp collisions at s=7 TeV

The production of the charm-strange baryon Csi0c is measured for the first time at the LHC via its semileptonic decay into e+Csi-νe in pp collisions at sqrt(s) = 7 TeV with the ALICE detector. The transverse momentum (pT) differential cross section multiplied by the branching ratio is presented in the interval 1 < pT < 8 GeV/c at mid-rapidity, |y| < 0.5. The transverse momentum dependence of the Csi0c baryon production relative to the D0 meson production is compared to predictions of event generators with various tunes of the hadronisation mechanism, which are found to underestimate the measured cross- section ratio.The production of the charm-strange baryon Csi0c is measured for the first time at the LHC via its semileptonic decay into e+Csi-νe in pp collisions at sqrt(s) = 7 TeV with the ALICE detector. The transverse momentum (pT) differential cross section multiplied by the branching ratio is presented in the interval 1 < pT < 8 GeV/c at mid-rapidity, |y| < 0.5. The transverse momentum dependence of the Csi0c baryon production relative to the D0 meson production is compared to predictions of event generators with various tunes of the hadronisation mechanism, which are found to underestimate the measured cross- section ratio