538 research outputs found
Perfil compósito para colector solar, respectivo método de produção e utilização
A presente invenção diz respeito a um perfil compósito para caixa modular
utilizada em colectores solares para aquecimento de águas para uso doméstico
ou industrial cujas principais vantagens passam pela: produção através de um
processo de extrusão, redução das perdas energéticas do colector solar devido
ao design com perfil alveolar, fácil portabilidade devido a redução do peso por
metro quadrado de painel, utilização de compósitos recicláveis na sua
composição usando entre outros: borracha de pneu usado reciclada, redução dos
tempos de montagem dos colectores solares, eliminação da necessidade de
colocação de isolantes adicionais à caixa modular e redução dos custos de produção
Material compósito de granulado de borracha de pneus usados reciclado numa matriz polimérica
A presente invenção apresenta uma solução que incorpora e melhora a adesão
entre o granulado de borracha de pneu usado e a matriz polimérica, pela adição
de um agente compatibilizador que para além de compatibilizar os materiais,
promove a homogeneidade da mistura e consequentemente obtém-se um
material com boas propriedades mecânicas e com bom aspecto superficial. A
presente invenção consiste na apresentação de novas formulações de materiais
que incorporam borracha de pneu usado em matrizes poliméricas termoplásticas
utilizando um agente compatibilizador. Desta mistura obtêm-se produtos com composição de borracha de pneu usado com uma matriz polimérica, recorrendo a
aditivos para melhorar as propriedades finais do compósito. O custo é primordial para competir com produtos feitos de matérias virgens e como tal, este processo visa
reduzir o custo do produto bem como a quantidade relativa da matéria virgem utilizada e o reaproveitamento da borracha reciclada
Estudo dos fatores motivacionais e orientação de vida de universitários
Objetivo: investigar o nível de motivação acadêmica e o tipo de orientação de vida de universitários. Método: fizeram parte do estudo 119 acadêmicos do curso de Educação Física de uma instituição de ensino superior do estado do Paraná, sendo 77 (64,7%) do curso integral e 42 (35,3%) do curso noturno. Como instrumentos foram utilizados a Escala de Motivação Acadêmica e o Teste de Orientação de Vida. Para análise dos dados foram utilizados os testes Kolmogorov-Smirnov, alfa de Cronbach e Mann-Whitney (
CARACTERÍSTICAS DE INDIVÍDUOS QUE VIVENCIARAM O ÊXODO RURAL EM UM MUNICÍPIO DA FRONTEIRA-OESTE DO RS
The increasing migration of people from countryside to the cities, registered in the past century, caused a series of difficulties to these workers and required their adaptation to urban conditions. The quantitative and descriptive research, case study, carried out in São Gabriel City, western border of the State of Rio Grande do Sul, located in the southern half of the state, was developed amongst citizens who moved from countryside to the urban area. Results showed that the enterviewed people nowadays develop actitivies as autonomous workers and as employees. Results also showed that, although part of the enterviewed people have informal jobs and face difficulties to find schools for their children, most of them own their own houses. The data confirms the difficulties faced by these people, but also demonstrates the efforts to minimize inequalities imposed by society.A crescente migração campo-cidade registrada no século passado impôs uma serie de dificuldades a estes trabalhadores e uma adaptação as condições urbanas. A pesquisa quantitativa, descritiva, estudo de caso, realizada e município São Gabriel, Fronteira-Oeste do Rio Grande do Sul, pertencente à Metade Sul do estado foi desenvolvida junto a cidadãos que abandonaram o campo. Os resultados demonstraram que os entrevistados hoje desenvolvem atividades tanto como empregados e como autônomos. Ainda é percebido o emprego informal e a dificuldade de escolas para os filhos, porém a maioria possui casa própria. Os dados confirmam as dificuldades enfrentadas por estes migrantes, mas também os esforços empreendidos para atenuar as desigualdades impostas pela sociedade
DAS SALAS DE AULA ÀS TELAS: A DOCÊNCIA EM REPORTAGENS DA MÍDIA DIGITAL DURANTE A PANDEMIA DE COVID-19
Este artigo apresenta problematizações construídas a partir de uma pesquisa sobre os significados da docência em reportagens da mídia digital durante a pandemia de COVID-19. Fundamenta-se nos Estudos Culturais, em específico nas análises de inspiração Pós-Estruturalista, compreendendo o significado como cultural e socialmente produzido e a mídia como instância produtora de formas de comunicar e de sujeitos. A pesquisa foi operacionalizada a partir da busca on-line de notícias sobre professores(as) e ensino remoto, publicadas na internet entre junho e setembro de 2020. O exercício analítico empreendido levou à identificação de recorrências nos modos de significar a docência durante a pandemia, com destaque para a caracterização da atividade docente, realizada de forma emergencial e improvisada, como um exercício de reinvenção da identidade profissional e a representação da docência em tempos de distanciamento social a partir da ênfase no amor e no afeto
Mitochondrial physiology
As the knowledge base and importance of mitochondrial physiology to evolution, health and disease expands, the necessity for harmonizing the terminology concerning mitochondrial respiratory states and rates has become increasingly apparent. The chemiosmotic theory establishes the mechanism of energy transformation and coupling in oxidative phosphorylation. The unifying concept of the protonmotive force provides the framework for developing a consistent theoretical foundation of mitochondrial physiology and bioenergetics. We follow the latest SI guidelines and those of the International Union of Pure and Applied Chemistry (IUPAC) on terminology in physical chemistry, extended by considerations of open systems and thermodynamics of irreversible processes. The concept-driven constructive terminology incorporates the meaning of each quantity and aligns concepts and symbols with the nomenclature of classical bioenergetics. We endeavour to provide a balanced view of mitochondrial respiratory control and a critical discussion on reporting data of mitochondrial respiration in terms of metabolic flows and fluxes. Uniform standards for evaluation of respiratory states and rates will ultimately contribute to reproducibility between laboratories and thus support the development of data repositories of mitochondrial respiratory function in species, tissues, and cells. Clarity of concept and consistency of nomenclature facilitate effective transdisciplinary communication, education, and ultimately further discovery
Multidifferential study of identified charged hadron distributions in -tagged jets in proton-proton collisions at 13 TeV
Jet fragmentation functions are measured for the first time in proton-proton
collisions for charged pions, kaons, and protons within jets recoiling against
a boson. The charged-hadron distributions are studied longitudinally and
transversely to the jet direction for jets with transverse momentum 20 GeV and in the pseudorapidity range . The
data sample was collected with the LHCb experiment at a center-of-mass energy
of 13 TeV, corresponding to an integrated luminosity of 1.64 fb. Triple
differential distributions as a function of the hadron longitudinal momentum
fraction, hadron transverse momentum, and jet transverse momentum are also
measured for the first time. This helps constrain transverse-momentum-dependent
fragmentation functions. Differences in the shapes and magnitudes of the
measured distributions for the different hadron species provide insights into
the hadronization process for jets predominantly initiated by light quarks.Comment: All figures and tables, along with machine-readable versions and any
supplementary material and additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-013.html (LHCb
public pages
Study of the decay
The decay is studied
in proton-proton collisions at a center-of-mass energy of TeV
using data corresponding to an integrated luminosity of 5
collected by the LHCb experiment. In the system, the
state observed at the BaBar and Belle experiments is
resolved into two narrower states, and ,
whose masses and widths are measured to be where the first uncertainties are statistical and the second
systematic. The results are consistent with a previous LHCb measurement using a
prompt sample. Evidence of a new
state is found with a local significance of , whose mass and width
are measured to be and , respectively. In addition, evidence of a new decay mode
is found with a significance of
. The relative branching fraction of with respect to the
decay is measured to be , where the first
uncertainty is statistical, the second systematic and the third originates from
the branching fractions of charm hadron decays.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-028.html (LHCb
public pages
Mitochondrial physiology
As the knowledge base and importance of mitochondrial physiology to evolution, health and disease expands, the necessity for harmonizing the terminology concerning mitochondrial respiratory states and rates has become increasingly apparent. The chemiosmotic theory establishes the mechanism of energy transformation and coupling in oxidative phosphorylation. The unifying concept of the protonmotive force provides the framework for developing a consistent theoretical foundation of mitochondrial physiology and bioenergetics. We follow the latest SI guidelines and those of the International Union of Pure and Applied Chemistry (IUPAC) on terminology in physical chemistry, extended by considerations of open systems and thermodynamics of irreversible processes. The concept-driven constructive terminology incorporates the meaning of each quantity and aligns concepts and symbols with the nomenclature of classical bioenergetics. We endeavour to provide a balanced view of mitochondrial respiratory control and a critical discussion on reporting data of mitochondrial respiration in terms of metabolic flows and fluxes. Uniform standards for evaluation of respiratory states and rates will ultimately contribute to reproducibility between laboratories and thus support the development of data repositories of mitochondrial respiratory function in species, tissues, and cells. Clarity of concept and consistency of nomenclature facilitate effective transdisciplinary communication, education, and ultimately further discovery
Measurement of the ratios of branching fractions and
The ratios of branching fractions
and are measured, assuming isospin symmetry, using a
sample of proton-proton collision data corresponding to 3.0 fb of
integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The
tau lepton is identified in the decay mode
. The measured values are
and
, where the first uncertainty is
statistical and the second is systematic. The correlation between these
measurements is . Results are consistent with the current average
of these quantities and are at a combined 1.9 standard deviations from the
predictions based on lepton flavor universality in the Standard Model.Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-039.html (LHCb
public pages
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