371 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
A new case of t(5;14)(q31;q32) in a pediatric acute lymphoblastic leukemia presenting with hypereosinophilia
Case report of a translocation : A new case of t(5;14)(q31;q32) in a pediatric acute lymphoblastic leukemia presenting with hypereosinophilia
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 ÏL using the Bs0 âJ/Ïη decay mode
Using a protonâproton collision data sample collected by the LHCb detector and corresponding to an integrated luminosity of 5.7fb-1 , the lifetime of the light Bs0 mass eigenstate, ÏL , is measured using the Bs0âJ/Ïη decay mode to be ÏL=1.445±0.016(stat)±0.008(syst)ps. A combination of this result with a previous LHCb analysis using an independent dataset corresponding to 3 fb - 1 of integrated luminosity gives ÏL=1.452±0.014±0.007±0.002ps, where the first uncertainty is statistical, the second due to the uncorrelated part of the systematic uncertainty and the third due to the correlated part of the systematic uncertainty
A study of CP violation in the decays B±â[K+K-Ï+Ï-]Dh± (h= K, Ï) and B±â[Ï+Ï-Ï+Ï-]Dh±
The first study of CP violation in the decay mode B±â[K+K-Ï+Ï-]Dh± , with h= K, Ï , is presented, exploiting a data sample of protonâproton collisions collected by the LHCb experiment that corresponds to an integrated luminosity of 9 \,fb - 1 . The analysis is performed in bins of phase space, which are optimised for sensitivity to local CP asymmetries. CP -violating observables that are sensitive to the angle Îł of the Unitarity Triangle are determined. The analysis requires external information on charm-decay parameters, which are currently taken from an amplitude analysis of LHCb data, but can be updated in the future when direct measurements become available. Measurements are also performed of phase-space integrated observables for B±â[K+K-Ï+Ï-]Dh± and B±â[Ï+Ï-Ï+Ï-]Dh± decays
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
Search for violation in the phase space of decays with the energy test
A search for violation in and decays is reported.
The search is performed using an unbinned model-independent method known as the
energy test that probes local violation in the phase space of the
decays. The data analysed correspond to an integrated luminosity of
fb collected in proton-proton collisions by the LHCb experiment at
a centre-of-mass energy of ~TeV, amounting to approximately 950000
and 620000 signal candidates for the and modes, respectively. The
method is validated using
and decays, where
-violating effects are expected to be negligible, and using
background-enhanced regions of the signal decays. The results are consistent
with symmetry in both the and the decays, with
-values for the hypothesis of no violation of 70% and 66%,
respectively.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-019.html (LHCb
public pages
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
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