439 research outputs found
Influence of Hydrogen and Low Temperature on Pipeline Steels Mechanical Behaviour
Abstract In the presence of H2S, metallic materials, such as carbon and low alloy steels, may suffer hydrogen damage and hydrogen embrittlement. Gas transporting pipes in low temperature environment, during the shutdown and the subsequent re-starting operations, are exposed to very low temperatures (T=-40 °C). In the presence of high H2S content in the gas, the risk of brittle failure can be increased due to the effect of hydrogen on steel toughness. In this paper the influence of hydrogen and low temperature on mechanical properties of two pipeline materials, F22 low alloy and X65 micro-alloyed steels, is studied. Steels have been hydrogen charged by means of an electrochemical method: diffusible hydrogen content of steels is in the range 0.6 to 2 ppm. Charpy and J-R curves tests were carried out in the range from room temperature to T=-120 °C. Hydrogen affects mechanical properties of the tested materials, mainly reducing fracture toughness in J integral tests, while little influence has been observed in CV tests. Fracture surface examination confirms the results of mechanical testing
Expanding the phenotypic and genetic spectrum of radioulnar synostosis associated hematological disease.
Medical Research Council, Children with Cancer and Bloodwise
Enfermedad de Gaucher en Argentina: un informe del Registro Internacional de Gaucher y del Grupo Argentino de DiagnĂłstico y Tratamiento de la Enfermedad de Gaucher
La Enfermedad de Gaucher por su baja frecuencia estĂĄ incluida dentro de las enfermedades huĂ©rfanas. En 1991 comenzĂł el ingreso de pacientes en el Registro Internacional de Gaucher. En 1992 se incorporaron los primeros dos pacientes de LatinoamĂ©rica. En 2006 se creĂł el Grupo Argentino de DiagnĂłstico y Tratamiento de la Enfermedad de Gaucher siendo sus objetivos principales el entendimiento de la prevalencia, presentaciĂłn, manejo y tratamiento de la Enfermedad de Gaucher en Argentina. Hasta el 1 de febrero del 2013 ingresaron al Registro Internacional 5.986 pacientes provenientes de 60 paĂses, de los cuales 133 (2.22%) fueron argentinos. El anĂĄlisis de esta publicaciĂłn fue realizado sobre 133 pacientes con Enfermedad de Gaucher. Esta es la primera publicaciĂłn del Grupo Argentino de DiagnĂłstico y Tratamiento en base a los datos del Registro Internacional. La casuĂstica argentina mostrĂł un predominio femenino y la forma clĂnica mĂĄs frecuente fue el tipo 1 (97.7%, n=128). El genotipo fue identificado en 57 pacientes (42.9%), siendo el mĂĄs frecuente el N370S/ otro alelo (82.5%). Entre los pacientes con datos reportados, los sĂntomas basales predominantes, previos al inicio del tratamiento con Imiglucerasa que predominaron fueron la esplenomegalia (100%, n=13) y la hepatomegalia (88.9%, n=8) y como citopenias mĂĄs frecuentes, la trombocitopenia (64.2%, n=34) y la anemia (45.9%, n=28). La infiltraciĂłn de la mĂ©dula Ăłsea como un marcador especĂfico de enfermedad Ăłsea se encontrĂł en el 50% de los pacientes. En total, el 85.7% de los pacientes argentinos reciben terapia de reemplazo enzimĂĄtico con Imiglucerasa, logrĂĄndose las metas terapĂ©uticas, en la mayorĂa de los casos, en la Ășltima evaluaciĂłn. Las metas terapĂ©uticas mĂĄs frecuentemente alcanzadas resultaron: el control de las manifestaciones Ăłseas (dolor Ăłseo y crisis Ăłsea, 81.9% y 99% respectivamente) y la normalizaciĂłn de la hemoglobina (86.5%). La terapia de reemplazo enzimĂĄtica con Imiglucerasa, a largo plazo en la poblaciĂłn argentina demostrĂł ser una herramienta eficaz para mejorar los parĂĄmetros clĂnicos y bioquĂmicos de la Enfermedad de Gaucher tipo1.Fil: Drelichman, G.. Gobierno de la Ciudad de Buenos Aires. Hospital General de Niños "Ricardo GutiĂ©rrez"; ArgentinaFil: FernĂĄndez Escobar, NicolĂĄs. Gobierno de la Ciudad de Buenos Aires. Hospital General de Niños "Ricardo GutiĂ©rrez"; ArgentinaFil: Basack, Nora. Gobierno de la Ciudad de Buenos Aires. Hospital General de Niños "Ricardo GutiĂ©rrez"; ArgentinaFil: Kohan, R.. Registro Argentino de Gaucher; ArgentinaFil: Watman, N.. Gobierno de la Ciudad de Buenos Aires. Hospital General de Agudos "Ramos MejĂa"; ArgentinaFil: Bolesina, M.. Gobierno de la Ciudad de Buenos Aires. Hospital General de Agudos "Ramos MejĂa"; ArgentinaFil: Elena, G.. Gobierno de la Ciudad de Buenos Aires. Hospital General de Niños Pedro Elizalde (ex Casa Cuna); ArgentinaFil: Veber, S. E.. Gobierno de la Ciudad de Buenos Aires. Hospital General de Niños Pedro Elizalde (ex Casa Cuna); ArgentinaFil: Dragosky, M.. Gobierno de la Ciudad de Buenos Aires. Hospital de OncologĂa Marie Curie; ArgentinaFil: Annetta, I.. Gobierno de la Ciudad de Buenos Aires. Hospital de OncologĂa Marie Curie; ArgentinaFil: Feliu, A.. Gobierno de la Ciudad de Buenos Aires. Hospital de PediatrĂa "Juan P. Garrahan"; ArgentinaFil: Sciuccati, Gabriela. Gobierno de la Ciudad de Buenos Aires. Hospital de PediatrĂa "Juan P. Garrahan"; ArgentinaFil: Cuello, MarĂa Fernanda. Provincia de Buenos Aires. Ministerio de Salud. Hospital de Niños "Sor MarĂa Ludovica" de la Plata; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Fynn, Alcira. Provincia de Buenos Aires. Ministerio de Salud. Hospital de Niños "Sor MarĂa Ludovica" de la Plata; ArgentinaFil: Dodelson de Kremer, Raquel. Provincia de Buenos Aires. Ministerio de Salud. Hospital de Niños "Sor MarĂa Ludovica" de la Plata; ArgentinaFil: Angaroni, Celia Juana. Provincia de Buenos Aires. Ministerio de Salud. Hospital de Niños "Sor MarĂa Ludovica" de la Plata; ArgentinaFil: Giner Ayala, Alicia. Provincia de Buenos Aires. Ministerio de Salud. Hospital de Niños "Sor MarĂa Ludovica" de la Plata; ArgentinaFil: Del Valle Oller, Ana MarĂa. Provincia de Buenos Aires. Ministerio de Salud. Hospital de Niños "Sor MarĂa Ludovica" de la Plata; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Guelbert, Norberto Bernardo. Provincia de Buenos Aires. Ministerio de Salud. Hospital de Niños "Sor MarĂa Ludovica" de la Plata; ArgentinaFil: Delgado, MarĂa Andrea. Provincia de Buenos Aires. Ministerio de Salud. Hospital de Niños "Sor MarĂa Ludovica" de la Plata; ArgentinaFil: Becerra, Adriana BerĂłnica. Provincia de Buenos Aires. Ministerio de Salud. Hospital de Niños "Sor MarĂa Ludovica" de la Plata; ArgentinaFil: Oliveri, MarĂa Beatriz. Universidad de Buenos Aires. Facultad de Medicina. Hospital de ClĂnicas General San MartĂn; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: LarroudĂ©, M.. Centro MĂ©dico TIEMPO; ArgentinaFil: Masllorens, F.. Provincia de Buenos Aires. Ministerio de Salud. Hospital Nacional âProf. Dr.
A. Posadas"; ArgentinaFil: Szlago, M.. FundaciĂłn para el eEstudio de las Enfermedades NeurometabĂłlicas; Argentina. Laboratorio de NeuroquĂmica âDr. N. A. Chamolesâ; ArgentinaFil: Schenone, A.. Laboratorio de NeuroquĂmica âDr. N. A. Chamolesâ; Argentina. FundaciĂłn para el eEstudio de las Enfermedades NeurometabĂłlicas; Argentin
Measurement of antiproton production from antihyperon decays in pHe collisions at âsNN=110GeV
The interpretation of cosmic antiproton flux measurements from space-borne experiments is currently limited by the knowledge of the antiproton production cross-section in collisions between primary cosmic rays and the interstellar medium. Using collisions of protons with an energy of 6.5 TeV incident on helium nuclei at rest in the proximity of the interaction region of the LHCb experiment, the ratio of antiprotons originating from antihyperon decays to prompt production is measured for antiproton momenta between 12 and 110GeV\!/c . The dominant antihyperon contribution, namely ÎÂŻ â pÂŻ Ï+ decays from promptly produced ÎÂŻ particles, is also exclusively measured. The results complement the measurement of prompt antiproton production obtained from the same data sample. At the energy scale of this measurement, the antihyperon contributions to antiproton production are observed to be significantly larger than predictions of commonly used hadronic production models
Studies of and production in and Pb collisions
The production of and mesons is studied in proton-proton and
proton-lead collisions collected with the LHCb detector. Proton-proton
collisions are studied at center-of-mass energies of and ,
and proton-lead collisions are studied at a center-of-mass energy per nucleon
of . The studies are performed in center-of-mass rapidity
regions (forward rapidity) and
(backward rapidity) defined relative to the proton beam direction. The
and production cross sections are measured differentially as a function
of transverse momentum for and , respectively. The differential cross sections are used to
calculate nuclear modification factors. The nuclear modification factors for
and mesons agree at both forward and backward rapidity, showing
no significant evidence of mass dependence. The differential cross sections of
mesons are also used to calculate cross section ratios,
which show evidence of a deviation from the world average. These studies offer
new constraints on mass-dependent nuclear effects in heavy-ion collisions, as
well as and meson fragmentation.Comment: All figures and tables, along with machine-readable versions and any
supplementary material and additional information, are available at
https://lhcbproject.web.cern.ch/Publications/p/LHCb-PAPER-2023-030.html (LHCb
public pages
Observation of Cabibbo-suppressed two-body hadronic decays and precision mass measurement of the baryon
The first observation of the singly Cabibbo-suppressed
and decays
is reported, using proton-proton collision data at a centre-of-mass energy of
, corresponding to an integrated luminosity of , collected with the LHCb detector between 2016 and 2018. The
branching fraction ratios are measured to be
,
. In addition, using the
decay channel, the baryon
mass is measured to be , improving the
precision of the previous world average by a factor of four.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-011.html (LHCb
public pages
Measurement of lepton universality parameters in and decays
A simultaneous analysis of the and decays is performed to test muon-electron universality in
two ranges of the square of the dilepton invariant mass, . The measurement
uses a sample of beauty meson decays produced in proton-proton collisions
collected with the LHCb detector between 2011 and 2018, corresponding to an
integrated luminosity of . A sequence of multivariate
selections and strict particle identification requirements produce a higher
signal purity and a better statistical sensitivity per unit luminosity than
previous LHCb lepton universality tests using the same decay modes. Residual
backgrounds due to misidentified hadronic decays are studied using data and
included in the fit model. Each of the four lepton universality measurements
reported is either the first in the given interval or supersedes previous
LHCb measurements. The results are compatible with the predictions of the
Standard Model.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-045.html (LHCb
public pages
Test of lepton universality in decays
The first simultaneous test of muon-electron universality using
and decays is performed, in two ranges of the dilepton
invariant-mass squared, . The analysis uses beauty mesons produced in
proton-proton collisions collected with the LHCb detector between 2011 and
2018, corresponding to an integrated luminosity of 9 . Each
of the four lepton universality measurements reported is either the first in
the given interval or supersedes previous LHCb measurements. The
results are compatible with the predictions of the Standard Model.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-046.html (LHCb
public pages
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