22,407 research outputs found
Behaviour of vortex matter in the presence of periodic pinning
No full textHigh temperature superconductors YBa2Cu3O7-δ and YBa2Cu4O8 are studied for the case that field is aligned with the intrinsically layered structure. A novel susceptibility technique is employed, revealing pronounced commensurability oscillations, including the first observation of commensurability phenomena in Y124. Oscillations are periodic in B-1/2 and include distinct hysteretic features. History dependences reveal reversible regions that are attributed to commensurate states. A study of statistical variations between repeated measurements is used to quantify correlation between irreproducibility and irreversibility, providing evidence for transitions between commensurate states. Oscillation doubling is seen for high fields in Y123, and attributed to the effect of twins. A study of the phase diagram of underdoped YBa2Cu3O7-δ is presented, in fields up to 28T, made using both four-probe and flux transformer transport measurements, the latter technique enabling the measurement of the elimination of flux motion perpendicular to the crystal layers. The initial, diagonal part of the melting line at high temperature is seen to continue past the upturn at T*. The resulting phase diagram contains both this diagonal line, similar to the melting line away from alignment, and two vertical phase lines corresponding to the formation of Josephson vortices below T*, and the lower temperature TL, detected using the flux transformer, and below which vortex movement is locked into the planes. Pb hemispherical anti-dot arrays fabricated by a new technique of electroplating around self-assembled arrays of micron sized spheres are studied using AC susceptibility and DC magnetisation measurements. Pronounced commensurability effects are seen, with large increase in critical current and temperature at fields where there is an integer number of flux quanta per hole. Comparisons are drawn between these and arrays created using conventional lithographic techniques. Whilst both demonstrate commensurability effects, differences are marked. The large difference in the shape of holes in the arrays results in large differences in the qualitative commensurability behaviour. The weaker vortex pinning in the spherical arrays leads to a greater influence of vortex lattice forces, resulting in more collective type vortex pinning than individual. Unusual dynamic effects are also seen, including channelling effects for large drives.</p
Op-ed piece by Ed King describing the author\u27s visit to a University of Maine co
No full textOp-ed piece by Ed King describing the author\u27s visit to a University of Maine conference called Reading Stephen King: Issues of Choice, Censorship, and the Place of Popular Literature in the Canon. Ed King\u27s fellow attendees stopped talking to him after he admitted that he had never read any of Stephen King\u27s books and was only planning to write about how much money Stephen King makes
Author Ed McBain Book Signing
No full textAuthor Ed McBain hosts a book signing at the Bradenton Area Convention Cente
Op-Ed piece explaining why the author joined Carolyn Chute\u27s Second Maine Militi
No full textOp-Ed piece explaining why the author joined Carolyn Chute\u27s Second Maine Militia and describing the first meeting
Gen Ed /
No full text"Gen Ed locates serious discussion of general education in the context of some of the day-to-day realities encountered in putting it into practice and promoting efforts at reform at Metropolitan Atlantic University (aka the Metro). This dual focus is found in the often-pugnacious policy debate among the faculty and a more light-hearted discussion of related questions carried on by Professor Kelly as he models Socratic teaching in his upper-level class for prospective teachers. Reforming general education at the Metro is not free of the vanities and vulgarities of ambitious men and women and self-serving politicians, of course, nor those who poke fun at them. Arnie Smatter, the irrepressible and nosey chat show host of Radio YOY ensures that this does not go unnoticed. The overall humorous tone of Gen Ed does not detract from Mulcahy's thoughtful treatment of substantive issues that will be of interest to serious scholars, students, and a general readership. It is the behaviour of those involved, the broader media and political contexts in which events take place, which mainly becomes the object of humorous treatment"--Includes bibliographical references and index.Preface -- Acknowledgements -- Chapter 1 -- Chapter 2 -- Chapter 3 -- Chapter 4 -- Chapter 5 -- Chapter 6 -- Chapter 7 -- Chapter 8 -- Chapter 9 -- Chapter 10 -- Chapter 11 -- Chapter 12 -- Chapter 13 -- Chapter 14 -- Chapter 15 -- Chapter 16 -- Chapter 17 -- Chapter 18 -- Chapter 19 -- Chapter 20 -- Appendix: Questions for Discussion, Suggested Topics for Term Papers and Research Projects -- References -- About the Author."Gen Ed locates serious discussion of general education in the context of some of the day-to-day realities encountered in putting it into practice and promoting efforts at reform at Metropolitan Atlantic University (aka the Metro). This dual focus is found in the often-pugnacious policy debate among the faculty and a more light-hearted discussion of related questions carried on by Professor Kelly as he models Socratic teaching in his upper-level class for prospective teachers. Reforming general education at the Metro is not free of the vanities and vulgarities of ambitious men and women and self-serving politicians, of course, nor those who poke fun at them. Arnie Smatter, the irrepressible and nosey chat show host of Radio YOY ensures that this does not go unnoticed. The overall humorous tone of Gen Ed does not detract from Mulcahy's thoughtful treatment of substantive issues that will be of interest to serious scholars, students, and a general readership. It is the behaviour of those involved, the broader media and political contexts in which events take place, which mainly becomes the object of humorous treatment"--Description based on print version record
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Letter from Ed Hamilton to Carl Hayden
No full textLetter from Ed Hamilton to Carl Hayden requesting maintenance for the road between Grand Canyon Village and Rowe's Well
Ed Cray, July 3, 1933 - October 8, 2019
No full textEd Cray, a prolific author of non-fiction whose work included biographies of folk singer Woody Guthrie and Chief Justice Earl Warren, died Oct. 8 in Palo Alto, CA. He was 86
Letter from Carl Hayden to Ed Hamilton
No full textLetter from Carl Hayden to Ed Hamilton explaining that although there are currently no funds to improve the road between Grand Canyon Village and Rowe's Well, it will be taken into consideration when funding does become available
Letter from Carl Hayden to Ed Hamilton
No full textLetter from Carl Hayden to Ed Hamilton expressing regret that he cannot do more to secure funds for the road between Grand Canyon Village and Rowe's Well
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