8,964 research outputs found
Investigating the variability of low-mass active galactic nuclei in the X-ray, UV, and optical regimes.
No full textActive galactic nuclei (AGN) display variability in their emission of radiation that can be used to probe the geometry and physical processes that drive them. In this thesis I examine the variability found in the emissions of X-ray, UV, and Optical radiation from AGN to constrain the properties of these extreme systems. To begin with I present optical interband time lags of the low-mass low-accretion rate AGN NGC 4395 using multiwaveband Liverpool Telescope and HiPERCAM Gran Telescopio Canarias data. The lags found here are consistent with X-ray reprocessing and suggest the first ever detection of the edge of the accretion disc in an AGN. I then present a study of X-ray/UV observations taken from XMM-Newton with simultaneous ground-based optical observations to measure the X-ray/UV/Optical lags of NGC 4395. These support the previous observations and gather further evidence for the existence of a truncated accretion disc in this object. Next I examine the long-term optical power spectrum of NGC 4395 using multiple light curves observed across different timescales. In addition I use simulation techniques to extend the previous X-ray observations and use reverberation modelling to create synthetic optical light curves from these. Comparison of the model fits of the data and the simulations suggest the existence of a secondary long-term source of variability in addition to X-ray reprocessing. Finally I investigate the X-ray to UV time lags of a different object, NGC 4593, using simultaneous XMM-Newton, Swift, and AstroSat observations. Here I find evidence of timescale-dependent lags. When filtered for short timescales the lags are consistent with X-ray reprocessing, but this suggests other long-term processes also exist within the object. I also note the presence of previously described contributions from the Broad Line Region’s Balmer and Paschen continua
Enseñanza de la escritura de Max Aub: comprensión y memoria
No full textEste texto analiza a obra testimonial de Max Aub sobre su experiencia en los campos de concentración en Francia desde una perspectiva de discursos comparados. Para destacar las estrategias de la escritura del autor recuperables por otros proyectos discursivos que persigan la sensibilización y la denuncia a través del cruce entre la comunicación y la éticaThis text analyses the testimonial work of Max Aub about his experience in the French concentration camps in France from comparative discourses approach. It emphasizes the writing strategies used by the author useful for other awareness and denounce discourses through the dialogue among communication and ethic
Max Brooks literary reading flier
No full text2012 Bismarck State College Visiting Writers Series and ArtsQuest present: Max Brooks. April 25, 7:30 p.m.; Belle Mehus Auditorium. Max Brooks is the author of World War Z: An Oral History of the Zombie War and the graphic novel The Zombie Survival Guide: Recorded Attacks
Max Frisch's novel: Stiller. A study
No full text The attempt is made in the following study to present an interpretation of the novel "Stiller" by the Swiss author, Max Frisch, by tracing through the novel the dominant themes of the graven-image or 'Bildnis' and that of the problem of freedom with reference to the novel's main character. ThesisMaster of Arts (MA
A Transfer Report on the Development of a Framework to Evaluate Search Interfaces for their Support of Different User Types and Search Tactics
No full textAs the understanding of search systems, user needs and seeking strategies is developing, the design of search user interfaces is evolving to support more complicated and exploratory forms of search. With the design of new search features that enable these richer modes of exploration, comes the need to better understand the support they provide. In this report a new evaluation framework is presented that analyses search features for how they a) contribute to an overall interface, b) allow users to carry out different search tactics, and c) support different types of users and their needs. The novel contributions of the framework improve on some of the limitations of typical user studies, and allow search systems to be systematically analysed in much more detail and in much less time. The presented evaluation framework is then validated in three ways. First the validity of the models used as the building blocks of the framework are investigated through related work. Second the method of integrating these building-block models is validated and strengthened by consensus of expert opinion. Third, the overall approach is validated by comparing its analyses to the results of previously carried out user studies. The validation process has shown both the value of the framework and identified areas of future work that should be addressed for the framework to be completed. This report concludes with the set of contributions that the framework makes, and why the remaining work will be challenging, but critical to the final design
The subzero microbiome: Microbial activity in frozen and thawing soils
No full textMost of the Earth's biosphere is characterized by low temperatures (<5 °C) and cold-adapted microorganisms are widespread. These psychrophiles have evolved a complex range of adaptations of all cellular constituents to counteract the potentially deleterious effects of low kinetic energy environments and the freezing of water. Microbial life continues into the subzero temperature range, and this activity contributes to carbon and nitrogen flux in and out of ecosystems, ultimately affecting global processes. Microbial responses to climate warming and in particular, thawing of frozen soils are not yet well understood although the threat of microbial contribution to positive feedback of carbon flux is substantial. To date, several studies have examined microbial community dynamics in frozen soils and permafrost due to changing environmental conditions, and some have undertaken the complicated task of characterizing microbial functional groups and how their activity changes with changing conditions, either in situ or by isolating and characterizing macromolecules. With increasing temperature and wetter conditions microbial activity of key microbes and subsequent efflux of greenhouse gases also increase. In this review, we aim to provide an overview of microbial activity in seasonally frozen soils and permafrost. With a more detailed understanding of the microbiological activities in these vulnerable soil ecosystems, we can begin to predict and model future expectations for carbon release and climate change.Peer reviewe
Dr. Max Apple, Rice University
No full textDr. Max Apple, Rice University’s Department of English, with a full beard, standing behind a desk with one knee on the desk chair. Original resource is a black and white photograph
Frontline Timor : to resist is to win. by Max Stahl
No full texttag=1 data=Frontline Timor : to resist is to win. by Max Stahl
tag=2 data=Stahl, Max
tag=3 data=The Australian Magazine,
tag=6 data=18/19 January 1992
tag=7 data=6-12.
tag=8 data=SOUTH-EAST ASIA
tag=9 data=EAST TIMOR
tag=10 data=The author describes a rarely permitted visit to the secret camps of the Timorese guerillas who, despite the Dili massacre and the crushing presence of the Indonesian military, continue to hold out and plot for independence.
tag=11 data=1992/4/2
tag=12 data=92/0116
tag=13 data=CABThe author describes a rarely permitted visit to the secret camps of the Timorese guerillas who, despite the Dili massacre and the crushing presence of the Indonesian military, continue to hold out and plot for independence
Studies on linear systems and the eigenvalue problem over the max-plus algebra
No full textMax-plus代数は，実数全体に無限小元を付加した集合に，加法として最大値をとる演算，乗法として通常の加法を考えた代数系である．本論文では，max-plus線形方程式に対するCramerの公式の類似物を用いて，線形方程式の解空間の基底が構成できることを示した．さらに固有値問題に関連して，max-plus行列の固有ベクトルの概念を2通りの観点から拡張した．The max-plus algebra is the semiring with addition "max" and multiplication "+". In the present thesis, the author gives a combinatorial characterization of solutions of linear systems in terms of the max-plus Cramer's rule. Further, the author extends the concept of eigenvectors of max-plus matrices from two different perspectives.doctoral thesi
From Max Sutherland’s Weblog: www.sutherlandsurvey.com 1 Erectile Dysfunction and The Da Vinci Code.
No full textDr. Max Sutherland’s column is published monthly and posted on the web at www.sutherlandsurvey.com. Receive an advance copy by email- free subscription. Max Sutherland is author of the book 'Advertising & the Mind of the Consumer ’ (published in 8 languages) and is a registered psychologist. He works as an independent marketing consultant in Australia and USA and is also Adjunct Professor at Bond University. Contac
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