24,447 research outputs found
Métodos de Krylov-Newton aplicados à simulação numérica de reservatórios de petróleo
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico.A simulação do processo de extração de óleo em um reservatório de petróleo é um problema complexo que envolve o escoamento multifásico em um meio poroso de geometria arbitrária, podendo conter falhas geológicas e outras irregularidades. A modelagem numérica implícita deste problema requer a solução de um complexo sistema de equações não-lineares que pode ser resolvido de diversas formas, mais ou menos eficientes. A forma mais comum de solução deste sistema emprega o método de linearização de Newton ou alguma de suas variantes. O foco deste trabalho está na análise de uma extensa classe de métodos de Newton conhecidos como métodos de Newton inexatos. Estes métodos empregam um segundo método iterativo na solução da equação linearizada resolvendo-a até uma certa tolerância; daí serem chamados de inexatos. Os métodos inexatos abordados neste trabalho concentram-se na escolha de processos iterativos baseados em métodos de projeção no espaço de Krylov, tais como: GMRES, BICGSTAB, TFQMR. Estes métodos, que formam uma subclasse dos métodos de Newton inexatos, são conhecidos como métodos de Krylov-Newton. São abordados também métodos quase-newtonianos baseados na aproximação da matriz Jacobiana considerando apenas os termos ortogonais da discretização em sistemas curvilíneos não-ortogonais. Vários problemas com diferentes graus de não-ortogonalidade da malha e não-linearidades são resolvidos e comparados usando os diferentes métodos implementados
Latest results on Jovian disk X-rays from XMM-Newton
No full textWe present the results of a spectral study of the soft X-ray emission (0.2–2.5 keV) from low-latitude (‘disk’) regions of Jupiter. The data were obtained during two observing campaigns with XMM-Newton in April and November 2003. While the level of the emission remained approximately the same between April and the first half of the November observation, the second part of the latter shows an enhancement by about 40% in the 0.2–2.5 keV flux. A very similar, and apparently correlated increase, in time and scale, was observed in the solar X-ray and EUV flux.
The months of October and November 2003 saw a period of particularly intense solar activity, which appears reflected in the behavior of the soft X-rays from Jupiter's disk. The X-ray spectra, from the XMM-Newton EPIC CCD cameras, are all well fitted by a coronal model with temperatures in the range 0.4–0.5 keV, with additional line emission from Mg XI (1.35 keV) and Si XIII (1.86 keV): these are characteristic lines of solar X-ray spectra at maximum activity and during flares.
The XMM-Newton observations lend further support to the theory that Jupiter's disk X-ray emission is controlled by the Sun, and may be produced in large part by scattering, elastic and fluorescent, of solar X-rays in the upper atmosphere of the planet
Newton-Lievesley
No full textA personalised interpretation of a mobile phone video of a simple pendulum periodic motion at the science centre of Woolsthorpe Manor where Isaac Newton was born and lived
Letter re: Newton Lantron
No full textLetter from Mrs. Newton W. Lantron to Amon Carter inquiring about the status of her husband who is a prisoner of war at Oflag 64 in Germany
Letter re: Newton Lantron
No full textLetter from Mrs. Newton W. Lantron to Amon Carter inquiring about the status of her husband who is a prisoner of war at Oflag 64 in Germany
Pseudo-loadflow formulation as a starting process for the Newton Raphson
No full textThis paper introduces new models which approximate the AC loadflow problem, but are able to converge (using the Newton Raphson algorithm) from a wider range of starting points. The solution of the pseudo-loadflow models can provide a robust starting process for the Newton Raphson solution of the conventional loadflow problem. It is also shown that pseudo-loadflow solutions exist in many cases where the AC loadflow equations do not appear to have any solution, and in such cases the pseudo-loadflow solution can provide useful information to assist in locating the cause of infeasibility of the AC loadflow model. Test results are presented for illustrative small network examples and also for larger test networks. The computational requirements of the proposed methods are similar to those of the conventional Newton Raphson loadflow algorithm
A. Edward Newton, Author 2
No full textA. Edward Newton was an American author, publisher, and avid book collector. He was born in 1864 and passed away in 1940. (circa 1920s)https://digitalcommons.jsu.edu/lib-ac-histimg/1802/thumbnail.jp
A. Edward Newton, Author 1
No full textA. Edward Newton was an American author, publisher, and avid book collector. He was born in 1864 and passed away in 1940. (circa 1920s)https://digitalcommons.jsu.edu/lib-ac-histimg/1801/thumbnail.jp
The XMM-Newton view of the Crab
No full textAims. We discuss the current X-ray view of the Crab Nebula and Pulsar, summarising our analysis of observations of the source with the EPIC-pn camera on board the XMM-Newton observatory. Different modes of EPIC-pn were combined in order to yield a complete scenario of the spectral properties of the Crab resolved in space and time (pulse phase). In addition we give a description of the special
EPIC-pn Burst mode and guidance for data reduction in that mode.
Methods. We analysed spectra for the nebula and pulsar separately in the 0.6−12.0 keV energy band. All data were processed with the
SAS 6.0.0 XMM-Newton Scientific Analysis System package; models were fitted to the data with XSPEC 11. The high time resolution of EPIC-pn in its Burst mode (7 μs) was used for a phase resolved analysis of the pulsar spectrum, after determination of the period with epoch folding techniques. Data from the SmallWindow mode were processed and corrected for pile-up allowing for spectroscopy
simultaneously resolved in space and time.
Results. The spatial variation of the spectrum over the entire region of the Crab shows a gradual spectral softening from the inner pulsar region to the outer nebula region with a variation in photon index, Γ, from 2.0 to 2.4. Pulse phase resolved spectroscopy of the Crab Pulsar reveals a phase dependent modulation of the photon index in form of a significant hardening of the spectrum in the
inter-peak phase from Γ = 1.7 during the pulse peak to Γ = 1.5
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