Algebras of Convolution Type Operators on Weighted Variable Lebesgue Spaces

We prove a version of the Riesz-Thorin interpolation theorem for some types of weighted variable Lebesgue spaces. In order to do this we use the theory developed by Calderón in his 1964 article, together with some Banach function space theory. Using our version of the Riesz-Thorin theorem, we prove a version of the Stechkin inequality forweighted variable Lebesgue spaces, allowing us to define algebras of Fourier multipliers arising from functions of bounded variation. After analyzing the invertibility of Fourier convolution operators with piecewise continuous symbols, we shift our attention to slowly oscillating Fourier multipliers, finishing with a proof that the image in the Calkin algebra of the algebra of convolution type operators with slowly oscillating data is commutative.Provamos uma versão do teorema de interpolação de Riesz-Thorin para alguns tipos de espaços de Lebesgue com expoente variável e peso. De forma a atingir este objectivo, usamos a teoria desenvolvida por Calderón no seu artigo de 1964. Usando a versão do teorema de Riesz-Thorin obtida, provamos uma versão da desigualdade de Stechkin para espaços de Lebesgue com expoente variável e peso. Isto permite-nos definir álgebras de multiplicadores de Fourier associados a funções de variação limitada. Após analisada a invertibilidade dos operadores de convolução com símbolos contínuos por troços, deslocamos a nossa atenção para multiplicadores de Fourier fracamente oscilantes. Terminamos com a prova de que a imagem na álgebra de Calkin da álgebra de operadores tipo convolução com dados fracamente oscilantes é comutativa

On the imaging of electron transport in semiconductor quantum structures by scanning-gate microscopy: successes and limitations

This paper presents a brief review of scanning-gate microscopy applied to the imaging of electron transport in buried semiconductor quantum structures. After an introduction to the technique and to some of its practical issues, we summarise a selection of its successful achievements found in the literature, including our own research. The latter focuses on the imaging of GaInAs-based quantum rings both in the low magnetic field Aharonov-Bohm regime and in the high-field quantum Hall regime. Based on our own experience, we then discuss in detail some of the limitations of scanning-gate microscopy. These include possible tip induced artefacts, effects of a large bias applied to the scanning tip, as well as consequences of unwanted charge traps on the conductance maps. We emphasize how special care must be paid in interpreting these scanning-gate images.Comment: Special issue on (nano)characterization of semiconductor materials and structure

Robust semi-parametric inference for two-stage production models: A beta regression approach

The data envelopment analysis is related to a non-parametric mathematical tool used to assess the relative efficiency of productive units. In different studies on productive efficiency, it is common to employ semi-parametric procedures in two stages to determine whether any exogenous factors of interest affect the performance of productive units. However, some of these procedures, particularly those based on conventional statistical inference, generate inconsistent estimates when dealing with incoherent data-generating processes. This inconsistency arises due to the efficiency scores being limited to the unit interval, and the estimated scores often exhibit serial correlation and have limited observations. To address such inconsistency, several strategies have been suggested, with the most well-known being an algorithm based on a parametric bootstrap procedure using the truncated normal distribution and its regression model. In this work, we present a modification of this algorithm that utilizes the beta distribution and its regression structure. The beta model allows for better accommodation of asymmetry in the data distribution. Our proposed algorithm introduces inferential characteristics that are superior to the original algorithm, resulting in a more statistically coherent data-generating process and improving the consistency property. We have conducted computational experiments that demonstrate the improved results achieved by our proposal.ANCD -Agenția Națională pentru Cercetare și Dezvoltare(1200525

Comunicação e saúde. O cinema-debate para prevenir vícios

This paper presents the results of a qualitative multiple case study conducted from 2012 to 2015 in those using film-debate for the prevention of addiction and other risky behaviors among youth in Guerrero - Mexico. 152 young people participated in 5 experiences, and 33 focus groups were interpreted. The results allow us to understand that the mechanisms of appropriation of film stories are closely related to character identification and misidentification, the contextualization of the stories of cinema and the mobilization of feelings, which provides relevant knowledge to film theory, and in an educational context, the implementation of cinema debate as a proposal for addiction prevention.Este trabajo presenta los resultados de un estudio cualitativo de casos múltiples realizado desde el año 2012 al 2015 en el que se empleó el cine-debate como estrategia formativa para la prevención de adicciones y otras conductas de riesgo en jóvenes de Guerrero- México. Participaron en las 5 experiencias un total de 152 jóvenes y se interpretaron 33 grupos focales. Los resultados permiten comprender que los mecanismos de apropiación de los relatos cinematográficos se relacionan estrechamente con la identificación y desidentificación con los personajes, la contextualización de los relatos de cine y con la movilización de los sentimientos, aportando conocimientos relevantes para la teoría cinematográfica, y en el contexto educativo para la aplicación del cine debate como una propuesta para la prevención de adicciones.  DOI: https://doi.org/10.33571/revistaluciernaga.v8n16a3Este trabalho apresenta os resultados de um estudo qualitativo de casos múltiplos levados a cabo do ano 2012 até o 2015, onde se empregó o cinema-debate como estratégia formativa para a prevenção de vícios e outros comportamentos de risco dentro dos jovens de Guerrero-México. Nas 5 experiências participaram um total de 152 jovens e 33 grupos focais foram interpretados. Os resultados nos permitem entender que os mecanismos de apropriação das histórias dos filmes estão de perto relacionados com a identificação e desidentificación das personagens, a contextualización das histórias do cinema e com a mobilização dos sentimentos, fornecendo conhecimentos relevantes para a teoria cinematográfica, e no contexto educacional para a aplicação dos debates do cinema como uma proposta para a prevenção de vícios

Propuesta didáctica de las competencias del área de matemáticas en estudiantes del tercer grado del nivel primario en una institución educativa pública de Puerto Rubina, Datem del Marañón, Loreto

Nuestra investigación académica de suficiencia profesional plantea una propuesta didáctica con el fin de alcanzar las competencias matemáticas. Inicialmente se presenta el contexto social y cultural de la Institución Educativa. El segundo capítulo presenta a tres investigadores del aprendizaje: Piaget que propone los estadios del desarrollo cognitivo; Vygotsky, fundamenta las tres zonas de desarrollo en el aprendizaje, así como el contexto socio-cultural de la persona; por último, Ausubel propone el aprendizaje significativo y funcional. El tercer capítulo detalla el desarrollo de la programación anual correspondiente al grado y nivel, priorizado en competencias, capacidades y desempeños que los estudiantes deben alcanzar al finalizar el año académico. Finalmente, la propuesta didáctica plantea sugerencias para cada integrante de la comunidad educativa: directores, docentes, estudiantes y padres de familia.Our academic research of professional sufficiency proposes a didactic proposal in order to achieve mathematical competencies. Initially, the social and cultural context of the Educational Institution is presented. The second chapter presents three learning researchers: Piaget, who proposes the stages of cognitive development; Vygotsky, who bases the three developmental zones in learning, as well as the socio-cultural context of the person; finally, Ausubel proposes meaningful and functional learning. The third chapter details the development of the annual program corresponding to the grade and level, prioritized in competencies, capacities and performances that students must achieve at the end of the academic year. Finally, the didactic suggestions for each member of the educational community: principals, teachers, students and parents, teachers, students and parents.Trabajo de suficiencia profesiona

Phlebopus beniensis (Singer & Digilo) Heinem. & Rammeloo (Boletinellaceae, Basidiomycota, Fungi): novo registro para o Estado de São Paulo, Brasil e notas etnomicológicas

Phlebopus is a genus of boletoid fungi that produces conspicous basidiomes with large dimensions. The genus is represented in Brazil by six species distributed in eight States, with P. beniensis being here newly reported from the State of São Paulo, Southeastern Brazil. Therefore, the aim of this study is to report the occurrence of this species in São Paulo State based on specimens from Southwestern region of the State, as well as to present ethnomycological notes, including the first report of the species edibility.Phlebopus é um gênero de fungos boletoides que produz basidiomas conspícuos, de grandes dimensões. O gênero está representado no Brasil por seis espécies distribuídas em oito Estados, porém, P. beniensis ainda não havia sido registrada para o Estado de São Paulo, Sudeste do Brasil. Sendo assim, o objetivo deste trabalho é registrar a ocorrência da espécie para o Estado de São Paulo com base em espécimes da região sudoeste do Estado, assim como apresentar notas etnomicológicas, incluindo o primeiro registro de comestibilidade da espéci

ANTI-INFLAMATÓRIOS NÃO ESTEROIDAIS NO PÓS-OPERATÓRIO DE EQUINOS SUBMETIDOS A ORQUIECTOMIA

A orquiectomia bilateral eletiva é uma cirurgia simples e rotineira na prática equina. Apesar de tecnicamente simples, o potencial para complicações é alto. Edema prepucial e escrotal é a complicação pós-operatória mais comumente observada. Este trabalho objetivou avaliar o uso de flunixin meglumine e meloxicam no pós-operatório de equinos submetidos a orquiectomia. O meloxicam se demonstrou mais eficiente no controle da dor e edema quando comparado com o flunixin meglumine

HIV-seroconversion among HIV-1 serodiscordant married couples in Tanzania: a cohort study.

BACKGROUND: Heterosexual transmission is the main driver of the HIV epidemic in Tanzania. Only one estimate of the incidence rate of intra-marital HIV seroconversion in Tanzania has been reported and was derived from data collected between 1991 and 1995. Moreover, little is known about the specific risk factors for intra-marital seroconversion in Tanzania. Improved evidence around factors that increase the risk of HIV transmission to a serodiscordant spouse is needed to develop and improve evidence-based interventions. We sought to investigate the rate of intra-marital HIV seroconversion among HIV sero-discordant couples in Tanzania as well as its associated risk factors. METHODS: We identified all HIV positive individuals in the TAZAMA HIV-serosurvey cohort and followed up their serodiscordant spouse from 2006 to 2016. The rate of seroconversion was analyzed by survival analysis using non-parametric regressions with exponential distribution. RESULTS: We found 105 serodiscordant couples, 14 of which had a seroconverting spouse. The overall HIV-1 incidence rate among spouses of people with HIV-1 infection was 38.0 per 1000 person/years [22.5-64.1]. Notably, the HIV-1 incidence rate among HIV-1 seronegative male spouses was 6.7[0.9-47.5] per 1000 person/years, compared to 59.3 [34.4-102.1] per 1000 person/years among female spouses. Sex of the serodiscordant spouse was the only significant variable, even after adjusting for other variables (Hazard rate = 8.86[1.16-67.70], p = 0.036). CONCLUSIONS: Our study suggests that rates of HIV-1 seroconversion of sero-discordant partners are much higher within marriage than in the general population in Tanzania. The major risk factor for HIV-1 seroconversion is sex of the serodiscordant spouse, with female spouses being at very high risk of acquiring HIV infection. This suggests that future programs that target serodiscordant couples could be a novel and effective means of preventing HIV-1 transmission in Tanzania

Impact of schistosome infection on long-term HIV/AIDS outcomes.

BACKGROUND: Africa bears the burden of approximately 70% of global HIV infections and 90% of global schistosome infections. We sought to investigate the impact of schistosome infection at the time of HIV-1 seroconversion on the speed of HIV-1 disease progression, as measured by the outcome CD4+ T-cell (CD4) counts <350 cells/μL and/or death. We hypothesized that people who had been infected with Schistosoma spp. at the time they acquired HIV-1 infection would have impaired antiviral immune response, thus leading them to progress twice as fast to a CD4 count less than 350 cells/μL or death than would people who had been free of schistosomes at time of HIV-1 seroconversion. METHODS AND PRINCIPAL FINDINGS: We conducted a longitudinal study in Tanzania from 2006 to 2017 using stored blood spot samples, demographic surveillance and sero-survey data from the community, and a review of clinical charts. A competing risk analysis was performed to look at the difference in time to reaching CD4 counts < 350 cells/μL and/or death in HIV-1-infected people who were infected versus not infected with Schistosoma spp. at time of HIV-1 seroconversion. We found an 82% reduction in risk of reaching the outcome in seroconverters who had been infected with Schistosoma (subHazard Ratio = 0.18[0.068,0.50], p = 0.001) after adjusting for age, occupation, clinic attendance and time-dependent covariates. CONCLUSIONS: Our study demonstrates that people with schistosome infection at the time of HIV-seroconversion develop adverse HIV outcomes more slowly than those without. The findings are contrary to our original hypothesis. Our current longitudinal findings suggest complex interactions between HIV-1 and schistosome co-infections that may be modulated over time. We urge new immunological studies to investigate the long-term impact of schistosome infection on HIV-1 viral load and CD4 counts as well as related immunologic pathways