Multiparameter ergodic Cesàro-α averages

Let (X,F,ν) be a σ-finite measure space. Associated with k Lamperti operators on Lp(ν), T1,…,Tk, nˉ=(n1,…,nk)∈Nk and αˉ=(α1,…,αk) with 0<αj≤1, we define the ergodic Cesàro-αˉ averages Rnˉ,αˉf=1∏kj=1Aαjnj∑ik=0nk⋯∑i1=0n1∏j=1kAαj−1nj−ijTikk⋯Ti11f. For these averages we prove the almost everywhere convergence on X and the convergence in the Lp(ν) norm, when n1,…,nk→∞ independently, for all f∈Lp(dν) with p>1/α∗ where α∗=min1≤j≤kαj. In the limit case p=1/α∗, we prove that the averages Rnˉ,αˉf converge almost everywhere on X for all f in the Orlicz–Lorentz space Λ(1/α∗,φm−1) with φm(t)=t(1+log+t)m. To obtain the result in the limit case we need to study inequalities for the composition of operators Ti that are of restricted weak type (pi,pi). As another application of these inequalities we also study the strong Cesàro-αˉ continuity of functions.Fil: Bernardis, Ana Lucia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Matemática Aplicada del Litoral. Universidad Nacional del Litoral. Instituto de Matemática Aplicada del Litoral; ArgentinaFil: Crescimbeni, Raquel Liliana. Universidad Nacional del Comahue; ArgentinaFil: Ferrari Freire, Cecilia. Universidad Nacional del Comahue; Argentin

A note on wavelet expansions for dyadic BMO functions in spaces of homogeneous type

We give a characterization of dyadic BMO spaces in terms of Haarwavelet coefficients in spaces of homogeneous type.Fil: Crescimbeni, Raquel Liliana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Confluencia. Instituto de Investigación En Tecnologías y Ciencias de la Ingeniería. Universidad Nacional del Comahue. Instituto de Investigación En Tecnologías y Ciencias de la Ingeniería; Argentina. Universidad Nacional del Comahue. Facultad de Economía y Administración. Departamento de Matemática; ArgentinaFil: Nowak, Luis Maria Ricardo. Universidad Nacional del Comahue. Facultad de Economía y Administración. Departamento de Matemática; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Confluencia. Instituto de Investigación En Tecnologías y Ciencias de la Ingeniería. Universidad Nacional del Comahue. Instituto de Investigación En Tecnologías y Ciencias de la Ingeniería; Argentin

Two-weighted inequalities for the fractional integral associated to the Schrödinger operator

In this article we prove that the fractional integral operator associated to the Schrödinger second order differential operator L-α/2=(-Δ + V)-α/2maps with continuity weak Lebesgue space Lp,∞(v) into weighted Campanato-Hölder type spaces BMOβL(w), thus improving regularity under appropriate conditions on the pair of weights (v,w) and the parameters p, α and β. We also prove the continuous mapping from BMOβL(v) to BMOγL(w) for adequate pair of weights. Our results improve those known for the same weight in both sides of the inequality and they also enlarge the families of weights known for the classical fractional integral associated to the Laplacian operator L = -Δ.Fil: Crescimbeni, Raquel Liliana. Universidad Nacional del Comahue; ArgentinaFil: Hartzstein, Silvia Inés. Universidad Nacional del Litoral; ArgentinaFil: Salinas, Oscar Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Matemática Aplicada del Litoral. Universidad Nacional del Litoral. Instituto de Matemática Aplicada del Litoral; Argentin

Entre la historia y la memoria: debates actuales en torno a la (re) actualización del pasado

Existen grandes debates en torno al pasado que protagonizan una enorme cantidad de discusiones provenientes tanto del ámbito académico como de la agenda pública. Estos revelan tensiones en relación a la configuración de los relatos del pasado en los que intervienen representaciones históricas que entran en conflicto. La historia se manifiesta así como un terreno inestable en el que entran en pugna distintas memorias que lejos de pretenderse neutrales, se identifican con sensibilidades políticas. Consideraciones en torno a quién, qué y de qué modo las sociedades deben recordar, involucran a su vez otras preguntas: ¿acaso el olvido no forma parte de las operaciones de la memoria? ¿Debería el olvido ser cuestionado en relación con cualquier acercamiento a los hechos pasados? ¿Es posible reconstruir plenamente el tiempo pretérito? ¿Cómo delimitar un límite entre pasado, presente y futuro? ¿Existe una distinción entre ellos, más allá de las indicadas en términos lingüísticos? ¿Podemos rescatar del olvido ciertos acontecimientos históricos? Estos interrogantes han sido abordados por distintos pensadores que en este documento buscaremos retomar. Kant, Nietzsche, Proust, Benjamin, Foucault, Althusser y Hartog serán algunos de los teóricos más relevantes en las reflexiones aquí presentes. Sendos intelectuales animarán elaboraciones que examinen las complejas intersecciones entre historia, memoria y olvido.There exist significant debates about the past that are the subject of a large number of discussions both in academia and public agenda. These reveal tensions regarding the configuration of those accounts about the past in which conflicting historical representations take place. Therefore, history appears as an unstable ground where different memories come into conflict with each other, memories that, far from pretending to be neutral, identify themselves with political sensitivities. Conceptions around whom, what and how societies must remember increasingly involve other questions: Isn’t oblivion an operation of memory? Should oblivion be questioned regarding any approach to past events? Is it possible to rebuild the past? How can we draw a line between the past, present and future? Is there a distinction between them, beyond linguistic ones? Can we rescue certain historical events from oblivion? These questions have been addressed by some of the thinkers we aim to revisit in this document. Kant, Nietzsche, Proust, Benjamin, Foucault, Althusser and Hartog are some of the most relevant authors present in these lines. Each intellectual inspires theoretical elaborations that discuss and examine the complex intersections between history, memory and oblivion.Fil: Svampa, María Lucila. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Sociales. Instituto de Investigaciones "Gino Germani". Epistemología y Estudios Filosóficos de la Acción; ArgentinaFil: Espinosa, María Luciana. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Sociales. Instituto de Investigaciones "Gino Germani"; ArgentinaFil: Pinto, Lucia. Universidad de Buenos Aires. Facultad de Ciencias Sociales. Instituto de Investigaciones "Gino Germani"; ArgentinaFil: Carniglia, Luciano Andrés. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Sociales. Instituto de Investigaciones "Gino Germani"; Argentina. Centro de Investigaciones Filosóficas; ArgentinaFil: Crescimbeni, Camila. Universidad de Buenos Aires. Facultad de Ciencias Sociales. Instituto de Investigaciones "Gino Germani"; ArgentinaFil: Cocimano, Fernando. Universidad de Buenos Aires. Facultad de Ciencias Sociales. Instituto de Investigaciones "Gino Germani"; ArgentinaFil: Losiggio, Daniela. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Sociales. Instituto de Investigaciones "Gino Germani"; ArgentinaFil: Padilla, Maria Cecilia. Universidad de Buenos Aires. Facultad de Ciencias Sociales. Instituto de Investigaciones "Gino Germani"; ArgentinaFil: Villalba, Daniel. Universidad de Buenos Aires. Facultad de Ciencias Sociales. Instituto de Investigaciones "Gino Germani"; Argentin

Riesgo político y volatilidad : ¿influye la confianza en el gobierno en la volatilidad del Merval?

Fil: Crescimbeni, Dino. Universidad de San Andrés. Escuela de Administración y Negocios; Argentina."El presente trabajo investiga la interacción entre el riesgo político, y los valores y la volatilidad del mercado accionario argentino a través del Índice de Confianza en el Gobierno (ICG), las variables que lo componen, y el índice Merval (IM). Busca responder en qué medida el ICG y sus variables se relacionan con el IM, partiendo desde la hipótesis de que el Índice de Confianza en el Gobierno afecta positivamente los valores del índice Merval y negativamente su volatilidad. Se recurrió a los referentes literarios tanto clásicos como modernos para definir el método a llevar a cabo. Se utilizaron regresiones lineales simples para responder sobre el impacto individual de cada variable y del ICG. Los resultados obtenidos revelan que la honestidad y el interés de los funcionarios públicos en la población afectan positivamente los valores del índice Merval. Al mismo tiempo, el mercado de capitales reacciona con anterioridad a los eventos políticos. Por otro lado, la capacidad del gobierno para resolver los problemas que se le presentan disminuye el riesgo del mercado accionario."Álvarez, Víctor A

Singular integral characterization of nonisotropic generalized BMO spaces

summary:We extend a result of Coifman and Dahlberg [{\it Singular integral characterizations of nonisotropic $H^p$ spaces and the F. and M. Riesz theorem\/}, Proc. Sympos. Pure Math., Vol. 35, pp.\,231--234; Amer. Math. Soc., Providence, 1979] on the characterization of $H^p$ spaces by singular integrals of $\Bbb R^n$ with a nonisotropic metric. Then we apply it to produce singular integral versions of generalized BMO spaces. More precisely, if $T_\lambda$ is the family of dilations in $\Bbb R^n$ induced by a matrix with a nonnegative eigenvalue, then there exist $2n$ singular integral operators homogeneous with respect to the dilations $T_\lambda$ that characterize BMO$_\varphi$ under a natural condition on $\varphi$

Study of the performances of Mu2e Calorimeter using the final readout electronics.

The Mu2e experiment at Fermilab will search for Charged Lepton Flavour Violation (CLFV) looking for the conversion of a negative muon into an electron in the field of a nucleus. This process is heavily suppressed in the Standard Model of particle interactions (SM), with a branching ratio BR<10^(−50) and its detection would be a striking indication of new physics. The experiment sets out to achieve a single event sensitivity of 3×10^(−17) on the ratio between the probability of the conversion of a negative muon into an electron and the one of the muon capture by the nucleus. Even in case of no observation, this sensitivity will allow to improve by 4 orders of magnitude the present limit on the BR of this process, probing the predictions of different extensions of the SM. Mu2e is a complex experimental apparatus whose main subdetectors are a straw tube tracker, an Electromagnetic Calorimeter (ECAL) made of pure CsI crystals and a Cosmic Ray Veto system. The ECAL is particularly important for distinguishing electrons and muons to suppress the cosmic background, that is the main background of the experiment. To achieve this task the ECAL needs an excellent time resolution and a very good energy resolution. A waveform digitizer board (DiRAC) has been specifically designed to sample the calorimeter readout channels. The sampling frequency has been tuned through Monte Carlo simulations to 200 MHz. The work of this thesis has been focused on the first tests of the DiRAC board and in particular to the analysis of the data collected with the calorimeter prototype using cosmic rays. The board has firstly been checked with a custom system, developed during this thesis work, emulating the detector response, to check the correct reading of each pulse. Stress tests have been performed to optimize the board firmware and validate its functionality at high rates. The board has then been connected to a system made of a Silicon photomultiplier and a CsI crystal, emulating the full readout chain of Mu2e. All the components were the final ones that will be used in the experiment so this can be considered the first slice testof the ECAL readout system. Data from cosmic rays collected through this setup were used both the evaluate the integrity of the readout stream and to optimize the gain of the analog electronics using the minimum ionizing particles energy distribution as a reference. The main part of the thesis presents the experimental setup and data analysis of a much more complex Vertical Slice Test, performed at the INFN National Laboratories of Frascati, using a small scale prototype of the ECAL, called Module 0. This is equipped with 51 crystals and 20 of them are read by a single DIRAC board. All the system was kept in vacuum and thermalized to the real Mu2e expected running temperature. A large cosmic data sample has been collected using a continuous data taking, similar to the one that will run in the experiment, or an external trigger provided by two scintillator counters. The analysis of these data has allowed to confirm the full functionality of the board, to characterize the noise levels of the full acquisition chain, to validate the time and energy calibration procedures and the dynamic range of ECAL electronics and finally, for the first time, to evaluate the time and energy resolution of the calorimeter with the final readout chain in the expected running conditions. The time and energy resolutions measured with the Vertical Slice Test are in agreement with the ones obtained at previous test beams, using a commercial readout system. A realistic evaluation of ECAL performances has to take into account also the effects of neutron and ionizing radiation on the calorimeter components. Both crystals and SiPMs response can significantly differ from the ones measured at the test beam after a long exposure to radiation. For this reason it’s important to measure the neutron fluence and the total ionizing dose reaching the calorimeter. A section of this thesis will report on the work done to develop an innovative Neutron Radiation Detector based on the readout of dark current of SiPMs. Neutron radiation would increase the dark current value of SiPMs, and this physical issue can be used to extract the amount of radiation taken by the SiPMs itself. Copies of this detector will be placed in different parts of the calorimeter to continuously monitor the neutron fluence helping to set up the possible countermeasures. Finally, the results of the Vertical Slice Test have been used to tune the ECAL simulation used by the collaboration, including the effect of radiation damage in the degradation of ECAL performances. A multivariate analysis classifier has been trained to identify the conversion electrons against muons. The results confirm that the cosmic backgroud can be suppressed at the level needed to achieve the experiment sensitivity goal

Educación y ciudadanía en el siglo XXI

La ciudadanía es un concepto histórico complejo, cuyo marco de referencia cambia conforme mutan las comunidades políticas. La educación es un derecho social devenido de la ciudadanía moderna, pero a su vez cumple un rol esencial en la construcción de la misma. Estudiar la relación entre ciudadanía y educación se hace progresivamente relevante a medida que el mundo transita un ordenamiento global: es necesario transformar la ciudadanía en un concepto dinámico y capaz de generar nuevos consensos a través de una educación que incorpore la participación activa, la multiculturalidad y las nuevas tecnologíasCitizenship is a complex historical term, and its frame of reference changes together with political communities. Education is a social right derived from modern citizenship, but it also has an essential role in building the latter. Studying the relationship between citizenship and education becomes progressively relevant as the world undergoes globalization: citizenship must be transformed into a dynamic term, capable of generating new consensus through an education that must include active participation, multiculturalism and new technologie