40,990 research outputs found
White-dwarf white-dwarf galactic background in the LISA data
No full textContains fulltext :
33085.pdf ( ) (Open Access)LISA (Laser Interferometer Space Antenna) is a proposed space mission, which will use coherent laser beams exchanged between three remote spacecraft to detect and study low-frequency cosmic gravitational radiation. In the low part of its frequency band, the LISA strain sensitivity will be dominated by the incoherent superposition of hundreds of millions of gravitational wave signals radiated by inspiraling white-dwarf binaries present in our own Galaxy. In order to estimate the magnitude of the LISA response to this background, we have simulated a synthesized population that recently appeared in the literature. Our approach relies on entirely analytic expressions of the LISA time-delay interferometric responses to the gravitational radiation emitted by such systems, which allows us to implement a computationally efficient and accurate simulation of the background in the LISA data. We find the amplitude of the galactic white-dwarf binary background in the LISA data to be modulated in time, reaching a minimum equal to about twice that of the LISA noise for a period of about two months around the time when the Sun-LISA direction is roughly oriented towards the Autumn equinox. This suggests that, during this time period, LISA could search for other gravitational wave signals incoming from directions that are away from the galactic plane. Since the galactic white-dwarf background will be observed by LISA not as a stationary but rather as a cyclostationary random process with a period of 1 yr, we summarize the theory of cyclostationary random processes, present the corresponding generalized spectral method needed to characterize such process, and make a comparison between our analytic results and those obtained by applying our method to the simulated data. We find that, by measuring the generalized spectral components of the white-dwarf background, LISA will be able to infer properties of the distribution of the white-dwarf binary systems present in our Galaxy
Laura White: The Stuff of Images
No full textCastlefield Publications. Concept, editing and design by Laura White and Graphic Design Studio HIT.
Distributor: Corner House Publications, Manchester.
The Sculptural Language of images investigated through the work of Laura White and text by Lisa Le Feuvre, Andrew Renton and Laura U Marks. Ideas are explored around the physical relationship to images, where image and object are dissolved into one another in creating a haptic experience. The documentation of White’s practice and the stuff of images, is embedded within the book and its production.
Lisa Le Feuvre - Head of Sculpture studies at the Henry Moore Institute. Independent curator (co curator British Art show 7)
Andrew Renton – Reader in Art, Goldsmiths College and Director of Marlborough Contemporary.
Laura U Marks – Writer and Professor of Art at Dena Wosk University and Culture Studies, School for the Contemporary Arts, Simon Fraser University.
Book Launched at Castlefield Gallery, Manchester, November 2008 and CARTER Presents, London, February 2009 alongside solo exhibition:
If I had a monkey I wouldn’t need a TV Part 1 and 2
Figures Don't Lie: Spatial Humanities and Technology as Critical Thinking Tools
No full textThis presentation demonstrates the potential use of spatial humanities as both a critical thinking exercise and a computational tool in digital humanities pedagogy. “Figures Don’t Lie” presents a map of the United States that labels each state as a foreign nation according to the correlation between the GDPs of each state and their assigned countries. The map may spark classroom discussions about a range of humanities topics. Revealing the map’s underlying data shows how facts can be spun and helps students understand how the “facts” presented in the media may not be what they appear.Presented at Rutgers University's "Digital Humanities Showcase: New Methods and New Media" on January 29, 2014 (New Brunswick, N.J.)
Calculating All That Jazz: Linking Technical Specifications to the Management of Digitization Projects
No full textThe purpose of this session is to educate librarians and archivists about the technical aspects of the digitization process and demonstrate how deeper understanding of those aspects can be used to evaluate the appropriateness of digitization standards, project scope, quality of digitization equipment and storage needs for digitization projects involving photographs and documents. Most scholarship on archival-quality digitization has focused on either elements of digital library project management or on technical specifications and how to digitize materials. "Calculating All That Jazz" focuses on presenting a formula for calculating digital storage space based on analog still images and documents, demonstrating how deeper understanding of the technical elements of digitization in the formula applies directly to crucial project management considerations
The workshop as the work: white anti-racism organising in 1960s, 70s, and 80s US social movements
No full textThis thesis explores the rise of anti-racism workshops developed by white activists in various United States social movements from the late 1960s through the mid-1980s. The shifting ideology of the black freedom movement in the late 1960s, from integration to Black Power, transformed white activists‘ place within racial justice struggles. While recent scholarship has begun to turn its attention towards whites‘ ongoing racial justice activities, one of the most radical and widespread of these efforts is consistently overlooked: anti-racism workshops. Increasingly prevalent from the late 1960s through to the diversity-trainings explosion of the 1990s, this thesis demonstrates that these workshops had their roots in the black freedom, women‘s liberation and gay liberation movements. White activists from these movements led these workshops in order to examine white racial domination and privilege within both leftist social movements and larger US society.
Analysing case studies from the black freedom, women‘s liberation and gay liberation/rights movements, this thesis explores the foundational assumptions of anti-racism workshops. It seeks to explain how and why these efforts sought to frame race and racism as issues of knowledge and consciousness and why such efforts constituted radical praxis. It is argued that early anti-racism workshops were pedagogical projects that sought to confront the racial ignorance that structured the lives of whites in the US, including progressives and their liberation movements. This thesis draws attention to the efficacy and power of these workshops in terms of their epistemological effects, in the transformations they brought about in whites‘ understanding, or awareness, of racial realities
Lisa Rogers's Graduate Recital
No full textOriginal Format: CassetteComposers in the first graduate recital: Reinhold Moritzovich Gliere; Gary Burton; Keith Jarrett; Darius Milhaud; George Hamilton GreenComposers in the second graduate recital: James Curnow; Niel De Ponte; David A. White; Murray Houllif; Paul BernardinFirst Recital: PercussionSecond Recital: Percussio
Double white dwarfs and LISA
No full textClose pairs of white dwarfs are potential progenitors of type Ia supernovae and they are common, with the order of 100-300 million in the Galaxy. As such they will be significant, probably dominant, sources of the gravitational waves detectable by LISA. In the context of LISA's goals for fundamental physics, double white dwarfs are a source of noise, but from an astrophysical perspective, they are of considerable interest in their own right. In this paper I discuss our current knowledge of double white dwarfs and their close relatives (and possible descendants) the AM CVn stars. LISA will add to our knowledge of these systems by providing the following unique constraints: (i) an almost direct measurement of the galactic merger rate of DWDs from the detection of short period systems and their period evolution, (ii) an accurate and precise normalization of binary evolution models at shortest periods, (iii) a determination of the evolutionary pathways to the formation of AM CVn stars, (iv) measurements of the influence of tidal coupling in white dwarfs and its significance for stabilizing mass transfer, and (v) discovery of numerous examples of eclipsing white dwarfs with the potential for optical follow-up to test models of white dwarfs
Neutron star – white dwarf binaries: probing formation pathways and natal kicks with LISA
No full textNeutron star–white dwarf (NS + WD) binaries offer a unique opportunity for studying NS-specific phenomena with gravitational waves. In this paper, we employ the binary population synthesis technique to study the Galactic population of NS + WD binaries with the future Laser Interferometer Space Antenna (LISA). We anticipate approximately O (102) detectable NS + WD binaries by LISA, encompassing both circular and eccentric ones formed via different pathways. Despite the challenge of distinguishing these binaries from more prevalent double white dwarfs (especially at frequencies below 2 mHz), we show that their eccentricity and chirp mass distributions may provide avenues to explore the NS natal kicks and common envelope evolution. Additionally, we investigate the spatial distribution of detectable NS + WD binaries relative to the Galactic plane and discuss prospects for identifying electromagnetic counterparts at radio wavelengths. Our results emphasise LISA’s capability to detect and characterize NS + WD binaries and to offer insights into the properties of the underlying population. Our conclusions carry significant implications for shaping LISA data analysis strategies and future data interpretation
- …
