Dynamical star-disk interaction in the young stellar system V354 Mon

The main goal of this work is to characterize the mass accretion and ejection processes of the classical T Tauri star V354 Mon, a member of the young stellar cluster NGC 2264. In March 2008, photometric and spectroscopic observations of V354 Mon were obtained simultaneously with the CoRoT satellite, the 60 cm telescope at the Observat\'orio Pico dos Dias (LNA - Brazil) equipped with a CCD camera and Johnson/Cousins BVRI filters, and the SOPHIE \'echelle spectrograph at the Observatoire de Haute-Provence (CNRS - France). The light curve of V354 Mon shows periodical minima (P = 5.26 +/- 0.50 days) that vary in depth and width at each rotational cycle. From the analysis of the photometric and spectroscopic data, it is possible to identify correlations between the emission line variability and the light-curve modulation of the young system, such as the occurrence of pronounced redshifted absorption in the H_alpha line at the epoch of minimum flux. This is evidence that during photometric minima we see the accretion funnel projected onto the stellar photosphere in our line of sight, implying that the hot spot coincides with the light-curve minima. We applied models of cold and hot spots and a model of occultation by circumstellar material to investigate the source of the observed photometric variations. We conclude that nonuniformly distributed material in the inner part of the circumstellar disk is the main cause of the photometric modulation, which does not exclude the presence of hot and cold spots at the stellar surface. It is believed that the distortion in the inner part of the disk is created by the dynamical interaction between the stellar magnetosphere, inclined with respect to the rotation axis, and the circumstellar disk, as also observed in the classical T Tauri star AA Tau and predicted by magnetohydrodynamical numerical simulations.Comment: Accepted by Astronomy and Astrophysic

A microstructure-based finite element analysis of the response of sand

This paper presents a novel contribution towards understanding the stress distribution amongst the constituent grains of an intact sand under loading. Photoelasticity using birefringent materials has shown that forces in granular media are transmitted from particle-to-particle via their contacts and the mode of load propagation forms a complex force network. Particles carrying above average load appear to form a network with special characteristics where stronger forces are carried through chain-like particle groups, often referred as force chains. Fonseca et al. (2013) showed that for a sand under shearing, the contact normals tend to be orientated along the direction of the major principal stress, which suggests the formation of force chains. Moreover, these quasi-vertically oriented vectors were shown to be associated with contacts having large surface areas, contributing to the formation of solid columnar structures of stress transmitting grains. This early study demonstrates that a full characterization of force chains for real soils requires accounting for the effects of the soil microstructure, including grain morphology and contact topology, which the idealized nature of the particles used for discrete element method simulations and photoelasticity studies cannot capture. In the present work, high resolution x-ray tomographic data of an intact sand is converted into a two dimensional finite element mesh, so that the microstructural details, such as the geometrical arrangement of the grains and pores, as well as grain shape and contact topology are incorporated in the model. In other words, the soil microstructure is modelled using a computation approach that considers all available geometrical data. The results suggested that the ability of the grains to transmit stress via their contacts is directly associated to the degrees of freedom they have to move and rearrange, which in turn is controlled by the topology of the contacts. The insights into the effects of microstructure on the stress transmission mechanisms provided in this study are fundamental to better understand and predict the macro scale response of soil

Study of incidence of antiphospholipid antibody syndrome and low vitamin D levels as an etiological factor in recurrent pregnanc loss and their correlation

Background: Recurrent pregnancy loss is a heterogeneous reproductive problem, with multiple etiologies. Objective of this study was to study the incidence of APLA syndrome and low vitamin d levels in RPL and correlation between APLA syndrome and low vitamin D levels.Methods: This was an observational study conducted on 110 women seen in outpatient department/inpatient department of our institution from 1st August 2015 to 31st July 2016 who were known cases of RPL who fitted our inclusion and exclusion criteria.Results: It was found that majority of the RPL patients were in the age group of 30-34 years (42.72%) and they contributed to 43% of the abortions. 77.4% abortions occurred in the gestational age of 6-8 weeks. 21.81% patients were APLA positive. 23.63% patients had  low vitamin D levels. Out of the 21.81% patients who were APLA positive (50%) also had a low vitamin D level which was found to be statistically significant.Conclusions: There appears to be some correlation between APLA syndrome and low vitamin D levels, so both have to be treated simultaneously. Properly investigating women for APLA syndrome and vitamin D deficiency would select a treatable group of women with RPL

Complete genome sequence of the tropical-adapted Brazilian tomato (Solanum lycopersicum) cultivar IAC Santa Clara.

Resumo

Rank-(n – 1) convexity and quasiconvexity for divergence free fields

No description supplie

Erodibilidade do solo nos tabuleiros costeiros.

Para determinar perdas de solo por erosão hídrica, em diferentes situações, são utilizados modelos de predição de erosão, como a Equação Universal de Perdas de Solo (EUPS). A aplicação destes modelos, no planejamento agrícola e ambiental, depende da determinação dos fatores da EUPS, dentre estes a erodibilidade (fator K). Este estudo teve como objetivo determinar a erodibilidade, para as principais classes de solos da região dos Tabuleiros Costeiros, em Aracruz (ES). O experimento foi instalado nos seguintes solos: Argissolo Amarelo textura média/argilosa (PA1), Plintossolo Háplico (FX) e Argissolo Amarelo moderadamente rochoso (PA2). Para o cálculo da erodibilidade, foram utilizados dados de erosividade e de perdas de solo de novembro de 1997 a maio de 2004. As coletas de perdas de solo foram realizadas para cada evento de chuva considerada erosiva. Os valores de erodibilidade foram 0,007 Mg h MJ-1 mm-1; 0,017 Mg h MJ-1 mm-1; e 0,0004 Mg h MJ-1 mm-1, para PA1, FX e PA2, respectivamente

To study and compare the effectiveness of transobturator tape versus Kelly’s repair in the treatment of female stress urinary incontinence

Background: To compare the effectiveness of transobturator tape (TOT) versus Kelly’s repair in the treatment of female stress urinary incontinence.Methods: A retrospective experimental comparative study was conducted in the department of obstetrics and gynaecology in Lokmanya Tilak Municipal General Hospital, Mumbai, India from 2015 to 2016. A cohort of 60 patients was divided in two groups of 30 each. In group 1, patients who underwent transobturator tape fixation were included. In group 2 patients who underwent Kelly’s repair and outcomes were compared with a follow up of 1 year post surgery.Results: Out of 30 patients included in group 1, 29 slings were successful and 1 had a surgical failure in terms of persistence of stress incontinence whereas 3 had persistent symptom in group 2. 2 patients in group 1 and 4 in group 2 had urinary retention in the immediate postoperative phase. Dyspareunia occurred in 1 TOT patient and 3 Kelly’s repair. None had symptoms of overactive bladder in group 1, whereas group 2 had 1 patient with overactive bladder symptoms. None developed erosion in a 1 year follow up period.Conclusions: The transobturator approach is an effective treatment of SUI with higher cure rate, low morbidity, good patient satisfaction and faster recovery

A study of peripartum cardiomyopathy in a tertiary care center in India

Background: Peripartum cardiomyopathy is an idiopathic and reversible form of dilated cardiomyopathy. The aim of the study was to study the mean age of presentation of peripartum cardiomyopathy in pregnant patients over a period of 1 year in a tertiary health care and study the maternal and fetal outcome of patients with peripartum cardiomyopathy.Methods: A retrospective observational study with total of 22 patients with peripartum cardiomyopathy was diagnosed in a total of 10,279 deliveries conducted at LTMMC, Sion hospital between September 2014 to February 2016.Results: Our study revealed that most of the affected patients were young with the mean age at presentation being 26.8±4.29 years. Most of the patients were diagnosed in the postpartum period (63.6%). the most common risk factor was pre-eclampsia (22.7%) followed by anemia (18.2%). The mean Ejection fraction at the time of presentation was 25.3±9.8%. There were 2 (9.1%) intrauterine fetal deaths and 1 neonatal death.Conclusions: There is a need for more multi-centric studies in order to understand the underlying pathogenesis and to determine the possible early interventions to help provide better pregnancy outcome

Uso de atmosfera controlada para conservação pós-colheita do mamão "Golden".

Frutos de mamoeiro 'Golden' colhidos no estádio 3 de maturação foram armazenados sob controle de atmosfera (3%O2 e 3%CO2 , 3%O2 e 6%CO2 ou 8%CO2 , 5%O2 e 8%CO2) e sob atmosfera ambiente (70% ou 90% U.R.), por 20 ou 25 dias, seguidos de mais 5 dias em atmosfera ambiente, a 10º C. Após 4 dias a 22º C não se verificaram muitas diferenças entre tratamentos, porém o maior teor de sólidos solúveis em frutos armazenados sob 3%O2/3%CO2, e os maiores índices de maturidade nos frutos armazenados sob 3%O2/6%CO2, por 20 dias, sugerem que novos estudos possam ser realizados adotando-se tais concentrações