Browsing Exact and Earth Sciences by Title
Now showing items 2077-2096 of 6034
-
Foundations and applications of qualitative reasoning and model-based diagnosis
(1993) [Journal article]In this paper we summarize the foundation for a model-based approach to diagnosis of technical systems ud discuss the import&Dce of qualitative reasoning within this framework. Based on this, we propose to apply these ... -
Fourier transform infrared spectroscopy (FTIR) and multivariative analysis for identification of defferent vegetable oils used in biodiesel production
(2013) [Journal article]The main objective of this study was to use infrared spectroscopy to identify vegetable oils used as raw material for biodiesel production and apply multivariate analysis to the data. Six different vegetable oil sources—canola, ... -
Four new massive pulsating white dwarfs including an ultramassive DAV
(2017) [Journal article]We report the discovery of four massive (M > 0.8M ) ZZ Ceti white dwarfs, including an ultramassive 1.16M star. We obtained ground-based, time series photometry for 13 white dwarfs from the Sloan Digital Sky Survey Data ... -
Fração atribuível populacional
(2010) [Journal article]A fração atribuível populacional (FAP) é uma medida capaz de mensurar o efeito da eliminação do fator de risco para determinado desfecho, ou seja, mede o quanto a ocorrência do desfecho pode ser diminuída se o fator de ... -
Frações de fósforo em estrumes e sua eficiência como adubo fosfatado
(2001) [Journal article]Os estrumes empregados como fontes de fósforo podem ter eficiência fertilizante diferente da dos adubos comerciais solúveis. Tal eficiência pode variar com a origem do estrume e com as proporções das diferentes frações ... -
Fractal Weyl law behavior in an open Hamiltonian system
(2009) [Journal article]We numerically show fractal Weyl law behavior in an open Hamiltonian system that is described by a smooth potential and which supports numerous above-barrier resonances. This behavior holds even relatively far away from ... -
Fractionally integrated moving average stable processes with long-range dependence
(2022) [Journal article]Long memory processes driven by Lévy noise with finite second-order moments have been well studied in the literature. They form a very rich class of processes presenting an autocovariance function that decays like a power ... -
Fractional statistics in the chern-simons theory
(1990) [Journal article]A (2 + 1)-dimensional theory of charged scalar particles coupled to an abelian gauge field with a Chern-Simons term in the action is canonically quantized in a generalized linear non-covariant gauge. We find, in all gauges, ... -
Frailty and geriatric syndromes in elderly assisted in primary health care
(2016) [Journal article]The aim of this study was to describe the association between frailty and geriatric syndromes (GS) [cognitive impairment (CI); postural instability (PI); urinary/fecal incontinence (UFI); polypharmacy (PP); and immobility ... -
Um Framework de apoio à colaboração no projeto distribuído de sistemas integrados
(2004) [Journal article]O trabalho de pesquisa apresentado neste artigo tem por objetivo possibilitar a distribuição flexível de recursos e ferramentas de apoio ao projeto de sistemas integrados, considerando especificamente a necessidade de ... -
Framework Proposal for Open Innovation Implementation in SMEs of Regional Innovation Systems
(2019) [Journal article]In the literature of Open Innovation (OI), some specific themes, such as elaboration of methods, strategies and systematized processes of implementation are still little discussed. In attempted to fill this research gap, ... -
Free-volume kinetic models of granular matter
(2000) [Journal article]We show that the main dynamical features of granular media can be understood by means of simple models of fragile-glass-forming liquid [Kob and Andersen, Phys. Rev. E 48, 4364 (1993)] provided that gravity alone is taken ... -
Frenagem de um projétil em um meio fluido : "Qual seria a distância, dentro da água, percorrida por um projétil calibre .50 com massa de 50 g e velocidade de 850 m/s?"
(2013) [Journal article]Desenvolve-se um modelo simples para a frenagem que um projétil com velocidade inicial de centenas de metros por segundo sofre na água. O modelo envolve conhecimentos de mecânica de fluidos e de matemática ao nível de ... -
A frenagem eletromagnética de um ímã que cai
(2007) [Journal article]É apresentado um modelo para calcular a velocidade terminal de queda de magnetos cilíndricos em um tubo condutor nãoferromagnético. Resultados experimentais para diversos magnetos associados em série são relatados, ... -
Frequency-dependent exchange bias in NiFe/NiO films
(2003) [Journal article]Ferromagnetic (FM) resonance and magnetization curve measurements were performed at room temperature for a polycrystalline Ni81Fe19 coupled to NiO. It was observed that the shape of the angular variation of the resonance ... -
Friedel-crafts alkylation of toluene as a parallel reaction in propylene dimerization catalyzed by nickel β-diimine complex/easc in homogeneous phase
(2015) [Journal article]A oligomerização do propeno foi realizada utilizando o complexo dibromo-bis(N,N’- difenilpentano-2,4-diimina)niquel(II) como precursor catalítico combinado ao sesquicloreto de etilalumínio (Al2Et3Cl3, EASC) como co-catalisador. ... -
Friedrich Ratzel e a alma do povo da América do Norte
(2019) [Journal article] -
From light to mass : accessing the initial and present-day Galactic globular cluster mass functions
(2012) [Journal article] -
From proper motions to star cluster dynamics : measuring the velocity dispersion in deconvolved distribution functions
(2011) [Journal article]We investigate the effect that the usually large errors associated with ground-based proper motion (PM) components have on the determination of a star cluster’s velocity dispersion (σv). Rather than histograms, we work ... -
From the atomic limit to a metal-insulator transition in the hubbard model
(1995) [Journal article]Starting from the exact solution of the Hubbard model in the atomic limit, and treating the hopping term as a perturbation by means of a diagram technique, we discuss the electronic structure of the model in some simple ...