688 research outputs found
HIGH-ENERGY PHENOMENA STUDIED WITH X-RAY POLARIMETRY
No full textAfter more than 30 years since the last X-ray polarimetric measurements, performed in the 70's by the OSO-8 satellite, thanks to recent technological advances, polarimetry is considered again as a viable technique for studing X-ray sources. In this contribution the author briefly discusses a couple of astrophysical situations, related to the topics of this conference, where X-ray polarimetry can be extremely useful. The author also discusses the observational perspectives, listing the main future space missions (proposed or even already approved) carrying on-board an X-ray polarimeter
Long-term wind-driven X-ray spectral variability of NGC 1365 with Swift
No full textWe present long-term (months–years) X-ray spectral variability of the Seyfert 1.8 galaxy NGC 1365 as observed by Swift, which provides well-sampled observations over a much longer time-scale (six years) and a much larger flux range than is afforded by other observatories. At very low luminosities, the spectrum is very soft, becoming rapidly harder as the luminosity increases and then, above a particular luminosity, softening again. At a given flux level, the scatter in hardness ratio is not very large, meaning that the spectral shape is largely determined by the luminosity. The spectra were therefore summed in luminosity bins and fitted with a variety of models. The best-fitting model consists of two power laws, one unabsorbed and another, more luminous, which is absorbed. In this model, we find a range of intrinsic 0.5–10.0 keV luminosities of approximately 1.1–3.5 erg s?1, and a very large range of absorbing columns, of approximately 1022–1024 cm?2. Interestingly, we find that the absorbing column decreases with increasing luminosity, but that this result is not due to changes in ionization. We suggest that these observations might be interpreted in terms of a wind model in which the launch radius varies as a function of ionizing flux and disc temperature and therefore moves out with increasing accretion rate, i.e. increasing X-ray luminosity. Thus, depending on the inclination angle of the disc relative to the observer, the absorbing column may decrease as the accretion rate goes up. The weaker, unabsorbed, component may be a scattered component from the wind
The XMM-Newton long look of NGC 1365: uncovering of the obscured X-ray source
No full textWe present an analysis of the extreme obscuration variability observed during an XMM–Newton 5-d continuous monitoring of the active galactic nuclei (AGN) in NGC 1365. The source was in a reflection-dominated state in the first ∼1.5 d, then a strong increase in the 7–10 keV emission was observed in ∼10 h, followed by a symmetric decrease. The spectral analysis of the different states clearly shows that this variation is due to an uncovering of the X-ray source. From this observation, we estimate a size of the X-ray source DS < 1013 cm, a distance of the obscuring clouds R∼ 1016 cm and a density n∼ 1011 cm−3. These values suggest that the X-ray absorption/reflection originates from the broad-line region clouds. This is also supported by the resolved width of the iron narrow Kα emission line, consistent with the width of the broad Hβ line
Idea de el Buen Pastor copiada por lo S. S. Doctores representada en empresas sacras : con avisos espirituales y morales, politicos y económicos para el gouierno de un principe ecclesiastico...
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South Italian Matt-Painted Pottery from Zadar: archaeological excavations up to 1989
No full textU radu je predstavljena tipološka i kronološka analiza južnoitalske mat slikane keramike koja je pronađena u istraživanjima zadarskog poluotoka od obnove nakon 2. svjetskog rata te u istraživanjima koja slijede zaključno sa 1989. godinom. Spomenutu građu prvi je put obradila autorica članka kao dio diplomskog rada. Radi se o ulomcima posuda koje su uvezene s prostora Daunije u željeznom dobu. Od cjelokupnog korpusa u radu je izdvojeno po nekoliko ulomaka za svaku od pojedinih faza daunijske mat slikane keramike. Zastupljeni su ulomci iz srednje i kasne geometrijske faze, iz subgeometrijskih faza I i II te ulomci keramike s trakama i mješovitog tipa (ceramica a fasce e di tipo misto).This paper is a typological and chronological analysis of the South Italian matt-painted pottery excavated on Zadar Peninsula between the post-World War II reconstruction period and 1989. The said material was first analyzed by the author of this paper as part of her graduation thesis. It includes fragments of the vessels imported from Daunia region in Iron Age. Every individual phase of the Daunian matt-painted pottery is represented in this work by several fragments: Middle and Late Geometric phases and Subgeometric phases I and II. Banded pottery fragments and those of the mixed type (ceramica a fasce e di tipo misto) are also represented
„Крв његова на нас и нашу дјецу“ (Мт 27, 25) – могућност једне филојудејске егзегезе
No full textMatt 27:25 is one of the most controversial texts in the dialogue between Judaism and Christianity. The author’s goal is to emphasize incorrectness and danger of anti-Judaic and anti-Semitic interpretation of Matt 27:25. That is why the author observes these words in the historical context of the Church in which Matthew’s Gospel was written, while analyzing certain terms used in the text and comparing them to parallel synoptic texts and the rest of the New Testament. The author also reviews the history of the interpretation of Matt. 27:25 and those commentaries considered to be anti-Judaic. The conclusion is that the anti-Judaic reading of Matt. 27:25 is unjustified, as well as certain readings of patristic commentaries of this text that supposedly have anti-Judaic tone. Matt. 27:25 is a text can very well be interpreted as an expression of opportunity for Judaism, and not as the anti-Judaic expression
Interview with Monica Youn
No full textMonica Youn is the author of three books of poetry: Blackacre (2016), which was a finalist for the National Book Critics Circle Award; Ignatz (2010), which was a finalist for the National Book Award; and Barter (2003). Her poems have appeared in numerous journals and anthologies, including the New Yorker, the Paris Review, and the New York Times Magazine, and she has been awarded a Witter Bynner Fellowship from the Library of Congress and a Stegner Fellowship from Stanford University. A former attorney specializing in copyright and election law, she now teaches poetry at Princeton University. During her visit to Butler University as part of the Vivian S. Delbrook Visiting Writers Series, Youn took the time to speak with Manuscripts staff member Matt Del Busto
Interview with Kazim Ali
No full textKazim Ali is the author of several volumes of poetry, including Sky Ward, winner of the Ohioana Book Award in Poetry; The Far Mosque, winner of Alice James Books’ New England/New York Award; The Fortieth Day; All One’s Blue; and the cross-genre text Bright Felon. His novels include The Secret Room: A String Quartet, and among his books of essays is Fasting for Ramadan: Notes from a Spiritual Practice. Ali is an Associate Professor of Creative Writing and Comparative Literature at Oberlin College. His new book of poems, Inquisition, and a new hybrid memoir, Silver Road: Essays, Maps & Calligraphies, are scheduled for release in 2018. During his visit to Butler University as part of the Vivian S. Delbrook Visiting Writers Series, Ali took the time to speak with Manuscripts staff member Matt Del Busto
Quasi-orthogonal wideband radar waveforms based on chaotic systems
No full textThesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2007.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Includes bibliographical references (p. 137-138).With the development of A/D converters possessing sufficiently high sampling rates, it is now feasible to use arbitrary, wideband waveforms in radar applications. Large sets of quasi-orthogonal, wideband waveforms can be generated so that multiple radars can simultaneously operate in the same frequency band. Each individual radar receiver can process its own return as well as the orthogonal returns from the other radars, which opens the possibility for developing algorithms that combine data from multiple radar channels. Due to the random nature of chaotic signals, it is possible to develop a procedure for generating large sets (> 50) of quasi-orthogonal radar waveforms using deterministic chaos. Deterministic chaos is defined as a bounded, aperiodic flow with a sensitive dependence on initial conditions. There are many different types of chaotic systems. In this thesis, waveforms will be generated from the well-studied Lorenz system. Each waveform from the Lorenz system can be fully characterized by three parameters (o, b, and r) and a set of initial conditions, (xo, yo, zo). The particular parameter values greatly affect quality of the Lorenz waveform as quasi-orthogonal radar waveform. Therefore, this thesis conducts a parameter study to quantify how the parameters affect various radar waveform metrics. Additionally, this thesis proposes a procedure for modifying the Lorenz waveform in order to improve its performance on these metrics.by Matt Willsey.M.Eng
Protection Against Pursuit: A Conceptual and Empirical Comparison of Cyberstalking and Stalking Victimization Among a National Sample
No full textabstract: Cyberstalking is a relatively understudied area in criminology, with no consensus among scholars as to whether it represents a modified form of stalking or whether it is an entirely new and emerging criminal phenomenon. Using data from the 2006 Supplemental Victimization Survey (SVS) to the National Crime Victimization Survey (NCVS), this study compares stalking and cyberstalking victims across several dimensions, including situational features of their experiences and self-protective behaviors. Results indicate that there are significant differences between stalking and cyberstalking victims, including their number of self-protective behaviors adopted, duration of contact with their stalker, financial costs of victimization, and perceived fear at onset. Perceived fear over time, the occurrence of a physical attack, and sex of the victim were all associated with a higher number of self-protective behaviors for cyberstalking victims compared to stalking victims, net of the effect of the control variables. Implications for stalking theory, research, and criminal justice policy are discussed.This is an Author's Accepted Manuscript of an article published as Nobles, Matt R., Reyns, Bradford W., Fox, Kathleen A., & Fisher, Bonnie S. (2014). Protection Against Pursuit: A Conceptual and Empirical Comparison of Cyberstalking and Stalking Victimization Among a National Sample. JUSTICE QUARTERLY, 31(6), 986-1014. http://dx.doi.org/10.1080/07418825.2012.723030. Copyright Taylor & Francis, available online at: http://www.tandfonline.com/doi/abs/10.1080/07418825.2012.72303
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