Navegação Ciências Exatas e da Terra por Título
Resultados 4230-4249 de 5964
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Proton spin-lattice relaxation in TMMC [(ch/Sub 3/)/Sub 4/Nmncl/Sub 3/]
(1974) [Artigo de periódico]We examine the temperature and frequency dependence of the proton spin-1attice re1axation rate 1/T 1, as a probe of the electron-spin dynamics of the quasi-one-dimensional exchange-coupled paramagnet TMMC [(CH3) 4NMnC1J. ... -
Pseudorapidity distributions of charged hadrons in xenon-xenon collisionsat √sNN=5.44 TeV
(2019) [Artigo de periódico]Measurements of the pseudorapidity distributions of charged hadrons produced in xenon-xenon collisions at a nucleon-nucleon centre-of-mass energy of √sNN=5.44 TeV are presented. The measurements are based on data collected ... -
Pseudorapidity distributions of charged particles as a function of mid- and forward rapidity multiplicities in pp collisions at √s=5.02, 7 and 13 TeV
(2021) [Artigo de periódico]The multiplicity dependence of the pseudorapidity density of charged particles in proton–proton (pp) collisions at centre-of-mass energies s√ = 5.02, 7 and 13 TeV measured by ALICE is reported. The analysis relies on track ... -
PSS Health : como calcular tamanho de amostra para estimar média, proporção e correlação
(2021) [Artigo de periódico]A ferramenta PSS Health (Power and Sample Size for Health Researchers) foi desenvolvida com o propósito de facilitar o cálculo do tamanho amostral e do poder de testes de hipóteses para diferentes objetivos de estudo, ... -
PSS Health : como calcular tamanho de amostra para testar relações de variáveis com um desfecho binário
(2022) [Artigo de periódico]Dando continuidade à série de artigos que pretendem orientar o usuário na utilização da ferramenta PSS Health para o planejamento de uma pesquisa, esta edição apresenta um passo a passo de como realizar o cálculo para ... -
PSS Health : como calcular tamanho de amostra para testes de comparação de médias de dois grupos
(2022) [Artigo de periódico]Dando continuidade à série de artigos que pretendem orientar o usuário na utilização da ferramenta PSS Health para o planejamento de uma pesquisa, esta edição apresenta um passo a passo de como realizar o cálculo e de quais ... -
Psychosocial factors associated with adherence to treatment and quality of life in people living with HIV/AIDS in Brazi
(2014) [Artigo de periódico]Objective: The objective of this article was to investigate the biopsychosocial factors that influence adherence to treatment and the quality of life of individuals who have been successfully following the HIV/AIDS treatment. ... -
Pteridium catalensis SP.Nov., uma nova pteridófita fóssil do complexo carbonalítico Catalão I, Goiás
(2006) [Artigo de periódico]Pteridium catalensis sp. nov., pteridófita do Neógeno/Quaternário do município de Catalão, Goiás, é aqui erigida. Está representada por porções vegetativas e por estruturas férteis muito semelhantes às formas encontradas ... -
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS : I. Asteroseismology of the GW Virstars RX J2117+3412, HS 2324+3944, NGC 6905, NGC 1501, NGC 2371, and K 1−16
(2021) [Artigo de periódico]Context. The recent arrival of continuous photometric observations of unprecedented quality from space missions has strongly promoted the study of pulsating stars and caused great interest in the stellar astrophysics ... -
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS : II. Discovery of two new GW Vir stars: TIC 333432673 and TIC 095332541
(2021) [Artigo de periódico]Context. The Transiting Exoplanet Survey Satellite (TESS) mission is revolutionizing the blossoming area of asteroseismology, particularly of pulsating white dwarfs and pre-white dwarfs, thus continuing the impulse of its ... -
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS : III. Asteroseismology of the DBV star GD 358
(2022) [Artigo de periódico]Context. The collection of high-quality photometric data by space telescopes, such as the completed Kepler mission and the ongoing TESS program, is revolutionizing the area of white-dwarf asteroseismology. Among the different ... -
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS : IV. Discovery of two new GW Vir stars : TIC 0403800675 and TIC 1989122424
(2022) [Artigo de periódico]We present two new GW Vir-type pulsating white dwarf stars, TIC 0403800675 (WD J115727.68-280349.64) and TIC 1989122424 (WD J211738.38-552801.18) discovered in the Transiting Exoplanet Survey Satellite (TESS) photometric ... -
Pulsating low-mass white dwarfs in the frame of new evolutionary sequences : III. The pre-ELM white dwarf instability strip
(2016) [Artigo de periódico]Context. Many low-mass (M /M <∼ 0.45) and extremely low-mass (ELM, M /M <∼ 0.18−0.20) white-dwarf stars are currently being found in the field of the Milky Way. Some of these stars exhibit long-period gravity-mode (g-mode) ... -
Pulsating low-mass white dwarfs in the frame of new evolutionary sequences : VI. Thin H-envelope sequences and asteroseismology of ELMV stars revisited
(2018) [Artigo de periódico]Context. Some low-mass white-dwarf (WD) stars with H atmospheres currently being detected in our galaxy, show long-period g(gravity)-mode pulsations, and comprise the class of pulsating WDs called extremely low-mass variable ... -
Pulsating white dwarfs
(2017) [Artigo de periódico]The Sloan Digital Sky Survey has allowed us to increase the number of known white dwarfs by a factor of five and consequently the number of known pulsating white dwarfs also by a factor of five. It has also led to the ... -
Pulsation in the white dwarf HE 1017−1352
(2020) [Artigo de periódico]We report the detection of periodic variations on the Teff 32 000 K DA white dwarf star HE 1017−1352. We obtained time series photometry using the 4.1-m Southern Astrophysical Research telescope on three separate nights ... -
Pump-probe and pump-deplete-probe spectroscopies on carotenoids with N=9–15 conjugated bonds
(2006) [Artigo de periódico]A series of all-trans-carotenoids with N=9, 13, and 15 conjugated bonds has been studied by pump-probe and pump-deplete-probe spectroscopies to obtain a systematic analysis of the energy flow between the different electronic ... -
Pushing the ground-based limit : 14-μmag photometric precision with the definitive Whole Earth Telescope asteroseismic data set for the rapidly oscillating Ap star HR 1217
(2005) [Artigo de periódico]HR1217 is one of the best-studied rapidly oscillating Ap (roAp) stars, with a frequency spectrum of alternating even-and odd-l modes that are distorted by the presence of a strong, global magnetic field. Several recent ... -
PyNetMet : python tools for efficient work with networks and metabolic models
(2014) [Artigo de periódico]The complexity of genome-scale metabolic models and networks associated to biological systems makes the use of computational tools an essential element in the field of systems biology. Here we present PyNetMet, a Python ... -
A Python package for the Virtual Reference Feedback Tuning, a direct data-driven control method
(2020) [Artigo de periódico]In this paper, thepyvrft, a Python package for the data-driven control method known as Virtual Reference Feedback Tuning (VRFT), is presented. Virtual Reference Feedback Tuning is a control designtechnique that does not ...