CP and charge asymmetries at CDF

We present CDF results on the branching fractions and time-integrated direct CP asymmetries for B0 and B0s decay modes into pairs of charmless charged hadrons (pions or kaons). We report also the first observation of B0s->DsK mode and the measurement of its branching fraction.Comment: Proceedings of The 2007 Europhysics Conference on High Energy Physics Manchester, England 19-25 July 2007. To be published electronically by IoP Journals. FERMILAB-CONF-07-590-E. Nov 2007. 3p

Measurement of the Masses and Lifetimes of B Hadrons at the Tevatron

The latest results for the B Hadron sector at the Tevatron Collider are summarized. The properties of B Hadrons can be precisely measured at the Tevatron. In particularly we will focus on the masses and lifetimes. The new Tevatron results for the CP violation in B Hadrons will be also discussed.Comment: Proceedings of the 40th Rancontres de Moriond QCD and High Energies Hadronic Interactions 2006, 4 pages, 3 figure

CDF Hot Topics

After an introduction on the peculiarities of flavor-physics measurements at a hadron collider, and on the upgraded Collider Detector at Fermilab (CDF II), I show recent results on two-body B0 and B0s decays into charged, pseudo-scalar, charmless mesons or into muons, to illustrate how the flavor physics program at CDF is competitive with (in B0 decays) and complementary (in B0s decays) to B-factories. Results shown include the new measurement of the CP-violating asymmetry in B0-->K+pi- decays, the first measurement of the time-evolution of B0s-->K+K- decays, and the world best limits on the decay rates of rare B0/B0s-->mu+mu- modes.Comment: write-up for the proceedings of the "Flavor Physics & CP Violation Conference, Vancouver, 2006". 9 pages, 10 figures, to be published in the Electronic Conference Proceedings Archiv

Topology on the Lattice

We review the method developed in Pisa to determine the topological susceptibility in lattice QCD and present a collection of new and old results obtained by the method.Comment: 10 pages, 7 figures. Contribution to "Sense of Beauty in Physics - a volume in honour of Adriano Di Giacomo" (Pisa University Press, Pisa, 2006), on the occasion of his 70th birthda

CKM Parameters and Rare B Decays

Measurements of the angles and sides of the unitarity triangle and of the rates of rare B meson decays are crucial for the precise determination of Standard Model parameters and are sensitive to the presence of new physics particles in the loop diagrams. In this paper the recent measurements performed in this area by Babar and Belle will be presented. The direct measurement of the angle alpha is for the first time as precise as the indirect determination. The precision of the V_ub determination has improved significantly with respect to previous measurement. New limits on B->tau nu decays are presented, as well as updated measurements on b->s radiative transitions and a new observation of b->d gamma transition made by Belle.Comment: Talk presented at the Lepton-Photon 2005 Symposium, June 30-July 5, Uppsala, Sweden. 14 pages, 13 figure

Compensatory Feto-Placental Upregulation of the Nitric Oxide System during Fetal Growth Restriction

Background: Fetal Growth Restriction is often associated with a feto-placental vascular dysfunction conceivably involving endothelial cells. Our study aimed to verify this pathogenic role for feto-placental endothelial cells and, coincidentally, demonstrate any abnormality in the nitric oxide system. Methods: Prenatal assessment of feto-placental vascular function was combined with measurement of nitric oxide (in the form of S-nitrosohemoglobin) and its nitrite byproduct, and of the endogenous nitric oxide synthase inhibitor asymmetric dimethylarginine. Umbilical vein endothelial cells were also harvested to determine their gene profile. The study comprised term pregnancies with normal (n = 40) or small-for-gestational-age (n = 20) newborns, small-for-gestational-age preterm pregnancies (n = 15), and bi-chorial, bi-amniotic twin pregnancies with discordant fetal growth (n = 12). Results: Umbilical blood nitrite (p<0.001) and S-nitrosohemoglobin (p = 0.02) rose with fetal growth restriction while asymmetric dimethylarginine decreased (p = 0.003). Nitrite rise coincided with an abnormal Doppler profile from umbilical arteries. Fetal growth restriction umbilical vein endothelial cells produced more nitrite and also exhibited reciprocal changes in vasodilator (upwards) and vasoconstrictor (downwards) transcripts. Elevation in blood nitrite and S-nitrosohemoglobin persisted postnatally in the fetal growth restriction offspring. Conclusion: Fetal growth restriction is typified by increased nitric oxide production during pregnancy and after birth. This response is viewed as an adaptative event to sustain placental blood flow. However, its occurrence may modify the endothelial phenotype and may ultimately represent an element of risk for cardiovascular disease in adult life.Fil: Pisaneschi, Silvia. Università degli Studi di Pisa; Italia. Scuola Superiore Sant’Anna; ItaliaFil: Strigini, Francesca A. L.. Università degli Studi di Pisa; ItaliaFil: Sanchez, Angel Matias. Università degli Studi di Pisa; Italia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Medicina y Biología Experimental de Cuyo; ArgentinaFil: Begliuomini, Silvia. Università degli Studi di Pisa; ItaliaFil: Casarosa, Elena. Università degli Studi di Pisa; ItaliaFil: Ripoli, Andrea. National Research Council. Institute of Clinical Physiology, ; ItaliaFil: Ghirri, Paolo. Università degli Studi di Pisa; ItaliaFil: Boldrini, Antonio. Università degli Studi di Pisa; ItaliaFil: Fink, Bruno. Noxygen Science Transfer and Diagnostics; AlemaniaFil: Genazzani, Andrea R.. Università degli Studi di Pisa; ItaliaFil: Coceani, Flavio. Scuola Superiore Sant’Anna; ItaliaFil: Simoncini, Tommaso. Università degli Studi di Pisa; Itali

Estrategia socioemocional para favorecer el razonamiento matemático en estudiantes de grado décimo

Actualmente, las matemáticas tienen un papel fundamental en la construcción de una sociedad tecnológica, adaptada a las necesidades del entorno y con un nivel alto en educación. Ante la necesidad de involucrar teórica y metodológicamente el componente socioemocional con el aprendizaje de las matemáticas, el presente trabajo de investigación tiene como objetivo general determinar la influencia de la implementación de una estrategia socioemocional en la percepción sobre el razonamiento matemático en estudiantes del grado 10.º de la I. E. San José Obrero del municipio de Medellín, durante el primer periodo académico del año 2022. La metodología empleada fue CUALI-cuanti, alcance descriptivo y método de investigación acción. La muestra fue de 17 estudiantes del grado décimo. Los instrumentos de recolección de información consistieron, por un lado, en un cuestionario pretest y postest con escalamiento Likert y, por otro lado, cinco diarios de campo, derivados de la implementación de la estrategia socioemocional “Trigonometría experimental: una oportunidad para cambiar tu percepción”. En general, se puede apreciar que las actitudes y emociones oscilan de negativas a positivas, según el ambiente propiciado, la actitud del docente y la actividad realizada, mientras que las creencias son más permanentes y arraigadas y requieren más tiempo para cambiar su tendencia de negativas a positivas.Currently, mathematics has a fundamental role in the construction of a technological society, adapted to the needs of the environment and with a high level of education. Given the need to theoretically and methodologically involve the socio-emotional component with the learning of mathematics, this research work has the general objective of determining the influence of the implementation of a socio-emotional strategy on the perception of mathematical reasoning in 10th grade students. º of the I. E. San José Obrero of the municipality of Medellín, during the first academic period of the year 2022. The methodology used was QUALI-quanti, descriptive scope and action research method. The sample was 17 tenth grade students. The information collection instruments consisted, on the one hand, of a pre-test and post-test questionnaire with Likert scaling and, on the other hand, five field diaries, derived from the implementation of the socio-emotional strategy "Experimental trigonometry: an opportunity to change your perception”. In general, it can be seen that attitudes and emotions range from negative to positive, depending on the environment fostered, the attitude of the teacher and the activity carried out, while beliefs are more permanent and rooted and require more time to change their negative trend. to positive.https://scienti.minciencias.gov.co/cvlac/visualizador/generarCurriculoCv.do?cod_rh=00020416110000-0001-5367-4234Introducción. -- Planteamiento del problema. -- Formulación del problema. -- Objetivos. -- Objetivo general. -- Objetivos específicos. -- Justificación. -- Marco referencial. -- Antecedentes investigativos. --Antecedentes internacionales. -- Antecedentes nacionales. -- Antecedentes locales. -- Marco teórico. --Las emociones en el ser humano -- Origen y tipos de emociones -- Las emociones en la adolescencia y su influencia en el rendimiento escolar. -- Creencias, actitudes y emociones. -- Aprendizaje en las matemáticas. -- Habilidades de razonamiento. -- El razonamiento en el ser humano. -- El desarrollo de habilidades de razonamiento a partir de la teoría triárquica de la inteligencia. -- Marco metodológico. -- Enfoque. -- Método. -- Alcance. -- Marco contextual. -- Población y muestra. -- Técnicas e instrumentos de recolección de la información. -- Análisis de la información. -- Consideraciones éticas. -- Resultados del proceso con base en el método de investigación-acción. -- Fase 1. Planificación. -- Resultados del cuestionario diagnóstico tipo pretest, con escala Likert. -- Estrategia socioemocional con estudiantes de décimo grado. -- Fase 2. Acción y observación. -- Resultados de la implementación de la estrategia socioemocional. -- Resultados del cuestionario de cierre tipo postest, con escala Likert. -- Análisis de la diferencia entre los resultados del pretest y del postest, luego de la implementación de la estrategia socioemocional. -- Fase 3. Reflexión. -- Preguntas orientadoras o problematizadoras. -- Reflexiones y aprendizajes alcanzados. -- Indagación o nuevas construcciones teóricas. -- Conclusiones. -- Recomendaciones. -- Referencias. -- Anexos. -- Anexo 1. Cuestionario diagnóstico (pretest) y de cierre (postest), con escala Likert. -- Anexo 2. Solicitud de validación de instrumento por expertos: cuestionario diagnóstico y de cierre con escala Likert. -- Anexo 3. Validación de expertos de cuestionario diagnóstico y de cierre con escala Likert. -- Anexo 4. Diario de campo para la observación participante. -- Anexo 5. Rejilla de planeación de la estrategia socioemocional implementada. -- Anexo 6. Consentimiento informado para el trabajo con estudiantes del grado décimo de la I. E. San José Obrero

A Twin Spiral Planar Antenna for UWB Medical Radars

A planar-spiral antenna to be used in an ultrawideband (UWB) radar system for heart activity monitoring is presented. The antenna, named “twin,” is constituted by two spiral dipoles in a compact structure. The reflection coefficient at the feed point of the dipoles is lower than −8 dB over the 3–12 GHz band, while the two-dipoles coupling is about −20 dB. The radiated beam is perpendicular to the plane of the spiral, so the antenna is wearable and it may be an optimal radiator for a medical UWB radar for heart rate detection. The designed antenna has been also used to check some hypotheses about the UWB radar heart activity detection mechanism. The radiation impedance variation, caused by the thorax vibrations associated with heart activity, seems to be the most likely explanation of the UWB radar operation