345 research outputs found
Full-physics 3-D heterogeneous simulations of electromagnetic induction fields on level and deformed sea ice
No full textPublisher's PDFIn this paper we explore simulated responses of electromagnetic (EM) signals relative to in
situ field surveys and quantify the effects that different values of conductivity in sea ice have on the EM
fields. We compute EM responses of ice types with a three-dimensional (3-D) finite-volume
discretization of Maxwell’s equations and present 2-D sliced visualizations of their associated EM
fields at discrete frequencies. Several interesting observations result: First, since the simulator computes
the fields everywhere, each gridcell acts as a receiver within the model volume, and captures the
complete, coupled interactions between air, snow, sea ice and sea water as a function of their
conductivity; second, visualizations demonstrate how 1-D approximations near deformed ice features
are violated. But the most important new finding is that changes in conductivity affect EM field response
by modifying the magnitude and spatial patterns (i.e. footprint size and shape) of current density and
magnetic fields. These effects are demonstrated through a visual feature we define as ‘null lines’. Null
line shape is affected by changes in conductivity near material boundaries as well as transmitter
location. Our results encourage the use of null lines as a planning tool for better ground-truth field
measurements near deformed ice types.University of Delaware. Department of Geography.University of Delaware. Department of Electrical and Computer Engineering
Impact of spatial aliasing on sea-ice thickness measurements
No full textPublisher's PDFWe explore spatial aliasing of non-Gaussian distributions of sea-ice thickness. Using a
heuristic model and >1000 measurements, we show how different instrument footprint sizes and shapes
can cluster thickness distributions into artificial modes, thereby distorting frequency distribution,
making it difficult to compare and communicate information across spatial scales. This problem has not
been dealt with systematically in sea ice until now, largely because it appears to incur no significant
change in integrated thickness which often serves as a volume proxy. Concomitantly, demands are
increasing for thickness distribution as a resource for modeling, monitoring and forecasting air–sea
fluxes and growing human infrastructure needs in a changing polar environment. New demands include
the characterization of uncertainties both regionally and seasonally for spaceborne, airborne, in situ
and underwater measurements. To serve these growing needs, we quantify the impact of spatial aliasing
by computing resolution error (Er) over a range of horizontal scales (x) from 5 to 500 m. Results are
summarized through a power law (Er = bxm) with distinct exponents (m) from 0.3 to 0.5 using example
mathematical functions including Gaussian, inverse linear and running mean filters. Recommendations
and visualizations are provided to encourage discussion, new data acquisitions, analysis methods and
metadata formats.University of Delaware. Department of Geography.University of Delaware. Department of Electrical and Computer Engineering
On the uncertainty of sea-ice isostasy
No full textPublisher's PDFDuring late winter 2007, coincident measurements of sea ice were collected using various
sensors at an ice camp in the Beaufort Sea, Canadian Arctic. Analysis of the archived data provides new
insight into sea-ice isostasy and its related R-factor through case studies at three scales using different
combinations of snow and ice thickness components. At the smallest scale (<1 m; point scale), isostasy
is not expected, so we calculate a residual and define this as ��� (‘zjey’) to describe vertical displacement
due to deformation. From 1 to 10m length scales, we explore traditional isostasy and identify a specific
sequence of thickness calculations which minimize freeboard and elevation uncertainty. An effective
solution exists when the R-factor is allowed to vary: ranging from 2 to 12, with mean of 5.17, mode of
5.88 and skewed distribution. At regional scales, underwater, airborne and spaceborne platforms are
always missing thickness variables from either above or below sea level. For such situations, realistic
agreement is found by applying small-scale skewed ranges for the R-factor. These findings encourage a
broader isostasy solution as a function of potential energy and length scale. Overall, results add insight
to data collection strategies and metadata characteristics of different thickness products.University of Delaware. Department of Geography.University of Delaware. Department of Electrical and Computer Engineering
The anti-nuclear power movement and discourses of energy justice/ Jesse P. Van Gerven.
No full textIncludes bibliographical references."This study analyzes anti-nuclear power organizations' claims regarding public financing for new nuclear construction, issues associated with the management of high-level radioactive waste, and other campaigns to increase the safety of nuclear facilities. This leads the author to the identification of general principals of energy justice"--Introduction -- Federal "Loan Guarantees" for Financing New Nuclear Reactor Construction -- High-Level Radioactive Waste Management -- State/Local Financing of New Nuclear Reactor Construction and the Fights for Increased Nuclear Safety -- Conclusion.1 online resourc
The railway shorthand dictionary, presenting and illustrating practical word-signs and contractions which represent words and phrases occurring frequently in everyday correspondence and also 240 words having similar sounds and 240 railroad words and phrases ...
No full textBlank for "stenographer's word-list": p. 64.Introduction signed: Jesse L. Cook, author, David O. Barnell, editor and illustrator.Mode of access: Internet
The invisible artist: Arrangers in popular music (1950-2000): Their contribution and techniques
No full textThis thesis was submitted for the degree of Doctor of Philosophy and was awarded by Brunel University.This thesis is based on the research conducted by the author for the series,
Richard Niles' History of Pop Arranging, seven thirty-minute documentary
programmes for BBC Radio 2, researched, written and presented by the author and
broadcast in 2003. It also draws on interviews conducted by the author (and other
research) between 2002 and 2007 both for the radio series and for this thesis and on
the author's experience as a professional arranger in popular music working with
many of the genre's significant recording artists including Paul McCartney, Ray
Charles, Cher, Tina Turner, Westlife, Tears For Fears, Dusty Springfield, James
Brown, Pet Shop Boys, Kylie Minogue and producers including Trevor Hom, Steve
Lipson, Steve Mac and Steve Anderson.
It will be argued that the role of the arranger in popular music has often been
undervalued and that during a critical period of popular music history (1950-2000)
arrangers played a significant part in the evolution of musical content. This thesis is,
to the best of the author's knowledge, the first time (apart from the above mentioned
documentary) the subject has ever been examined. The arranger is "invisible" because musical arrangers are often un-credited on
record liner notes or in books or articles concerning popular music. A considerable
amount of research has been necessary to determine who wrote many of the
arrangements considered herein. Motown's Berry Gordy purposely kept the names of
musicians and arrangers off the records because he feared others might 'poach' the
trademark 'Motown Sound'. Other record labels considered the job of the arranger to
be reminiscent of an earlier era, diluting the Rock 'n' Roll image of emotion and
spontanaeity they wished to promote. Some producers and recording artists disliked
sharing credit for their work. Motown arranger David Van dePitte told the author that
arranging was "thankless and anonymous - a very service-oriented profession where
others often take credit for what you've done." Arranging has therefore remained an
intrinsically unseen art created by 'invisible' artists. By analyzing many recordings,
revealing the techniques and concepts they have used in their work to create popular
records, arrangers and their art will be made more 'visible'
Hardware and software architecture for multi-level UAV design
No full textThesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.Includes bibliographical references (p. 95-96).This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.The theory, simulation, design, and construction of a radically new type of unmanned aerial vehicle (UAV) are discussed. The vehicle architecture is based on a commercially available non-autonomous flyer called the Vectron Blackhawk Flying Saucer. Due to its full body rotation, the craft is more inherently gyroscopically stable than other more common types of UAVs. This morphology was chosen because it has never before been made autonomous, so the theory, simulation, design, and construction were all done from fundamental principles as an example of original multi-level autonomous development.by Jesse H.Z. Davis.M.Eng
Tristram Shandy : the triumph of imagination, wit, and feeling over rationalism
No full textLaurence Sterne thought that Tristram Shandy was "more read than understood." Certainly any comprehensive understanding of Tristram Shandy has never come easily. Explications of Sterne's novel have all too often been distorted by commentators lacking a sense of the age in which Sterne wrote. Even the most perceptive critics have tended either to generalize about all nine books of Tristram Shandy or to write shorter articles on single facets of Sterne's many-sided novel. The interrelation of the varied eighteenth century themes, one with another and each one with Sterne's central structural device, has never been satisfactorily demonstrated. This in the largest measure is the purpose of my paper.
I have approached Tristram Shandy from the viewpoint only of a literary critic, but also of an analytic philosopher. This new approach is warranted because of Sterne's obvious amusement with philosophical topics and because previous commentary has suffered from a lack of philosophical rigour.
My overall thesis is this: through a superb union of form and content, Sterne satirizes all philosophical systems based purely upon reason, or claiming to be based upon reason. Tristram Shandy humorously dramatizes the insufficiency of human reason and proposes instead man's imaginative faculties (wit, sympathy, fellow-feeling, and creativity) as the communicative path to understanding.
Since Sterne's central structural device (Tristram-as-author) is absolutely essential to any understanding of Tristram Shandy, my study begins by considering (1.) Sterne's deployment of his author-persona, and (2.) the personal characteristics which Tristram reveals through 'his' self-dramatization. These characteristics - including his characteristic unreliability and his habit of engaging the reader in mock-dialogue - maneuver the reader into the very form of the novel by demanding unusual imaginative cooperation.
My second chapter concerns the content of Tristram Shandy. Through his author-persona, Sterne satirizes philosophical systems and philosophical problems, while extolling man's imaginative and sympathetic faculties. Repeatedly, Sterne questions man's ability to communicate with absolute certainty. Building humorous scenes from communication failures, Sterne points to the question: What can we know and what is impossible for us to know? This question, developed through the Shandean themes, accords perfectly with Sterne's structural device of the unreliable narrator. Hence, both the form and the content of Tristram Shandy aim to tie the reader in perplexing epistemological knots.
The Shandean spirit further involves the reader in the same problems of certitude and incertitude. Drawing on the tradition of Erasmus, Shakespeare, Cervantes, and especially Rabelais, Laurence Sterne created a narrator who demands imaginative, festive reciprocity from his reader. The spirit of festive merriment accords with Tristram's unreliability and with the Shandean satire of solemn rationalism.
In my fourth chapter I use the techniques of linguistic analysis to explore Tristram's unreliability. My exploration points to the difference between the language of philosophy and the language of literature. The former aims to communicate rationally and with certainty; the latter aims to communicate imaginatively. Sterne cast Tristram not as the "historian" he claims to be, but as a psychologically realistic author, dramatizing his process of creativity.
Sterne's dramatization of the creative process lays bare the limits of language and shows the creative writer's quest for new ways to communicate. My fifth chapter treats this dimension of Sterne's author-persona. Sterne's rendering of the creative process forces us to read Tristram Shandy creatively. It forces us to participate in an imaginative process, rather than a completely rational one.
My final chapter views A Sentimental Journey as the consequence of Tristram Shandy. In Tristram Shandy Sterne's iii main concern had been with man's creative imagination. Yet even in that first novel Sterne suggested that intuitive, imaginative sympathy can transcend philosophical scepticism and lead to communication through "feeling". In A Sentimental Journey Sterne repeatedly dramatizes the possibilities of sympathetic communication. Hence, Sterne's second novel reflects the message of his first: men can communicate imaginatively, even though logic, philosophy, and pure rationality preclude absolutely certain communication.
There is, perhaps, nothing startling in my conclusion that Tristram Shandy denigrates rationalism, the better to extol man's imaginative potential. Yet, the detailed analysis that leads to my conclusion gives a new, philosophical exactitude to the epistemological puzzles that most readers "see" at the heart of Tristram Shandy, but do not pause to analyse. In the course of this paper I also throw new light upon such well-worn Shandean issues as "the association of ideas" and "time in the novel", while showing, too, that Sterne's humour and his sentiment both emanate from the faculty of imagination.
Since Sterne himself jettisoned the linear plot-line, I have often followed the tactic of quoting from different volumes of Tristram Shandy to substantiate the particular point I am arguing at the time. Likewise, I sometimes use the same incident in several places to illustrate diverse points. At any given time I may not be saying the single, most important thing which can be said about the Shandean passage under discussion. Yet, if commentary upon Tristram Shandy is to be orderly, this approach (though it occasions some repetition) seems unavoidable. I have, therefore, abstracted the form for my paper from Sterne's artful confusion in order to provide a pattern for critical exposition
Fluid-mediated sources of granular temperature at finite Reynolds numbers
No full textWe derive analytical solutions for hydrodynamic sources and sinks to granular temperature in moderately dense suspensions of elastic particles at finite Reynolds numbers. Modelling the neighbour-induced drag disturbances with a Langevin equation allows an exact solution for the joint fluctuating acceleration–velocity distribution function P(v′,a′;t). Quadrant-conditioned covariance integrals of P(v′,a′;t) yield the hydrodynamic source and sink that dictate the evolution of granular temperature that can be used in Eulerian two-fluid models. Analytical predictions agree with benchmark data from particle-resolved direct numerical simulations and show promise as a general theory from gas–solid to bubbly flows.This article that has been published by Cambridge University Press as Lattanzi, Aaron M., Vahid Tavanashad, Shankar Subramaniam, and Jesse Capecelatro. "Fluid-mediated sources of granular temperature at finite Reynolds numbers." Journal of Fluid Mechanics 942 (2022): A7. DOI: 10.1017/jfm.2022.351. Copyright 2022 The Author(s). Attribution 4.0 International (CC BY 4.0). Posted with permission
Management of a patient with Turner syndrome presenting with an isolated left subclavian artery aneurysm
No full textFirst author Jesse Columbo is a medical student at the University of Massachusetts Medical School.We describe a case of a 52-year-old female with Turner syndrome found to have an isolated 3.5-cm left subclavian artery aneurysm. Surgical intervention was performed to decrease the risk of compressive symptoms, distal embolization, and rupture. This entailed exclusion of the aneurysm proximally using thoracic stent graft, carotid-subclavian bypass, and ligation of the subclavian artery distal to the aneurysm. One-year follow-up demonstrated exclusion of the aneurysm with a 5-mm reduction in maximum aneurysm sac diameter. This case represents the management of a rare isolated left subclavian artery aneurysm, in the setting of Turner syndrome, treated with a successful endovascular approach
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