19 research outputs found
Neutrino Masses, Mixing and New Physics Effects
We introduce a parametrization of the effects of radiative corrections from
new physics on the charged lepton and neutrino mass matrices, studying how
several relevant quantities describing the pattern of neutrino masses and
mixing are affected by these corrections. We find that the ratio omega = sin
theta / tan theta_atm is remarkably stable, even when relatively large
corrections are added to the original mass matrices. It is also found that if
the lightest neutrino has a mass around 0.3 eV, the pattern of masses and
mixings is considerably more stable under perturbations than for a lighter or
heavier spectrum. We explore the consequences of perturbations on some flavor
relations given in the literature. In addition, for a quasi-degenerate neutrino
spectrum it is shown that: (i) starting from a bi-maximal mixing scenario, the
corrections to the mass matrices keep tan theta_atm very close to unity while
they can lower tan theta_sol to its measured value; (ii) beginning from a
scenario with a vanishing Dirac phase, corrections can induce a Dirac phase
large enough to yield CP violation observable in neutrino oscillations.Comment: 14 pages, 21 figures. Uses RevTeX4. Added several comments and
references. Final version to appear in PR
InterferĂȘncia e estudo fitossociolĂłgico da comunidade infestante em beterraba de semeadura direta
Measurement of the longitudinal diffusion of ionization electrons in the MicroBooNE detector
Abstract: Accurate knowledge of electron transport properties is vital to understanding the information provided by liquid argon time projection chambers (LArTPCs). Ionization electron drift-lifetime, local electric field distortions caused by positive ion accumulation, and electron diffusion can all significantly impact the measured signal waveforms. This paper presents a measurement of the effective longitudinal electron diffusion coefficient, DL, in MicroBooNE at the nominal electric field strength of 273.9 V/cm. Historically, this measurement has been made in LArTPC prototype detectors. This represents the first measurement in a large-scale (85 tonne active volume) LArTPC operating in a neutrino beam. This is the largest dataset ever used for this measurement. Using a sample of âŒ70,000 through-going cosmic ray muon tracks tagged with MicroBooNE's cosmic ray tagger system, we measure DL = 3.74+0.28 -0.29 cm2/s
CONFRONTO DI PROTOCOLLI DIAGNOSTICI ALL'UNIVERSITA' DEGLI STUDI DI MODENA E REGGIO EMILIA
Nella realtĂ italiana la diagnosi di DSA negli adulti incontra notevoli difficoltĂ , in quanto i servizi per l'etĂ evolutiva valutano solitamente ragazzi fino a 18 anni neon esiste un servizio clinico per la diagnosi dell'adulto diffuso a livello nazionale, ad eccezione di alcune realtĂ . Nell'anno 2013 il Servizio Accoglienza Studenti Disabili e con DSA dell'UniversitĂ degli Studi di Modena e Reggio Emilia, in collaborazione con il Servizio di diagnosi per studenti ed adulti con DSA dell'arcispedale Santa Maria Nuova di Reggio Emilia, ha condotto una ricerca al fine di individuare quali prove fossero piĂč sensibili per la diagnosi di DSA nei soggetti adulti, attraverso la somministrazione di due diverse batterie neuropsicologiche
Growth and mineral nutrition of Ipomoea hederifolia
Um experimento em casa de vegetação foi conduzido entre novembro de 2005 e abril de 2006, na FCAV/UNESP, Brasil, objetivando estudar a produção de massa seca, a distribuição e o acĂșmulo de macronutrientes por Ipomoea hederifolia, uma importante planta daninha em culturas anuais e perenes no Brasil. As plantas foram cultivadas em vasos de 7 L com substrato de areia, que foram irrigados diariamente com solução nutritiva de Hoagland & Arnon. Os tratamentos corresponderam Ă s Ă©pocas de avaliação, em intervalos de 14 dias, iniciando-se 21 dias apĂłs a emergĂȘncia (DAE). em cada avaliação, as plantas de quatro vasos foram analisadas quanto Ă produção de massa seca e ao conteĂșdo de macronutrientes. I. hederifolia apresentou pequeno acĂșmulo de massa seca e de macronutrientes no inĂcio da fase experimental, o qual foi intensificado apĂłs 63 DAE. As folhas foram as principais estruturas acumuladoras de massa seca na primeira metade do ciclo de I. hederifolia, enquanto os caules o foram na segunda metade. N e K foram os macronutrientes mais acumulados em plantas dessa espĂ©cie. O perĂodo de acĂșmulo mĂĄximo de massa seca e macronutrientes por I. hederifolia ocorreu entre 133 e 146 DAE.A greenhouse experiment was carried out from November 2005 to April 2006 at FCAV/UNESP, Brazil, to study the growth and accumulation and distribution of dry mass and macronutrients in Ipomoea hederifolia, an important weed in annual and perennial crops in Brazil. The plants were grown in 7-liter pots with sand substrate and irrigated with Hoagland and Arnon nutrient solution. The treatments corresponded to evaluation times, at 14 day intervals, beginning on the 21st day after emergence (DAE). Plants of four pots were analyzed for growth and mineral nutrition. I. hederifolia showed small dry mass and macronutrient accumulation at the beginning of the experimental phase, intensified after 63 DAE. The leaves and stems were the main structures accumulating dry mass in the first and second half of the cycle,respectively,. N and K accumulated most in I. hederifolia plants. The maximum dry mass and macronutrient period for I. hederifolia occurred between 133 and 146 DAE
InterferĂȘncia de Euphorbia heterophylla no crescimento e acĂșmulo de macronutrientes da soja Interference of Euphorbia heterophylla in the growth and macronutrient accumulation of soybean
O grau de interferĂȘncia depende da densidade de plantas daninhas que infestam a soja. O objetivo deste trabalho foi avaliar caracterĂsticas de crescimento e nutrição mineral da soja mantida em convivĂȘncia com densidades crescentes de Euphorbia heterophylla. O experimento foi conduzido em Jaboticabal, SP, Brasil, entre outubro e dezembro de 2008, em vasos mantidos em campo aberto. Os tratamentos consistiram em submeter uma planta de soja por vaso Ă convivĂȘncia com 0, 1, 2, 4, 8 e 16 plantas de E. heterophylla por vaso, da semeadura atĂ© o inĂcio do florescimento. Nesse perĂodo, avaliaram-se, apenas na soja, a altura e o nĂșmero de trifĂłlios, e em ambas as espĂ©cies, a matĂ©ria seca e o acĂșmulo de macronutrientes. Observou-se variação na altura de plantas e redução no nĂșmero de trifĂłlios e no acĂșmulo de matĂ©ria seca e macronutrientes da soja devido ao maior acĂșmulo de matĂ©ria seca e macronutrientes por densidades crescentes de E. heterophylla. Conclui-se que a soja mantida em convivĂȘncia com E. heterophylla teve o crescimento e o acĂșmulo de macronutrientes reduzidos em razĂŁo da interferĂȘncia imposta pela planta daninha.<br>The degree of weed interference depends on the density of the weeds infesting the soybean crop. The objective of this work was to evaluate the growth and mineral nutrition characteristics in soybean maintained in coexistence with increasing densities of Euphorbia heterophylla. The experiment was carried out in Jaboticabal, SP, Brazil, from October through December 2008, in pots maintained under open field conditions. The treatments consisted in submitting one soybean plant per pot to coexistence with 0, 1, 2, 4, 8 and 16 plants of E. heterophylla per pot, from sowing until the beginning of soybean flowering. At this period, only height and number of leaves were evaluated in soybean, while dry matter and macronutrient accumulation were evaluated in both species. Variation in plant height and reduction in the number of leaves and dry matter and macronutrient accumulation of soybean were observed due to the higher accumulation of dry matter and macronutrients per increasing densities of E. heterophylla. It was concluded that growth and macronutrient accumulation of soybean maintained in coexistence with E. heterophylla were reduced due to weed interference