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Search Results: 1 - 10 of 1314 matches for " Don Petcher "
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Absence of Chiral Fermions in the Eichten--Preskill Model
Maarten Golterman,Don Petcher,Elena Rivas
Physics , 1992, DOI: 10.1016/0550-3213(93)90049-U
Abstract: The model proposed by Eichten and Preskill for obtaining theories with chiral fermions from the lattice is shown to undergo spontaneous symmetry breaking. In addition, the fermions appear to be Dirac-like everywhere in the phase diagram with no room for undoubled Weyl fermions. The phase diagram of a closely related Higgs-Yukawa model is similar to that of the Smit--Swift model, which also does not give rise to chiral fermions. These results cast serious doubts on the original scenario for the emergence of chiral fermions.
Chiral Gauge Theories and Fermion-Higgs Systems
Donald N. Petcher
Physics , 1993, DOI: 10.1016/0920-5632(93)90177-8
Abstract: Summary talk presented at the Conference on Lattice Field Theory, Amsterdam, September, 1992. Abstract: The status of several proposals for defining a theory of chiral fermions on the lattice is reviewed and some new estimates for the upper bound on the Higgs mass are presented.
The Foundational Cryptography Framework
Adam Petcher,Greg Morrisett
Computer Science , 2014,
Abstract: We present the Foundational Cryptography Framework (FCF) for developing and checking complete proofs of security for cryptographic schemes within a proof assistant. This is a general-purpose framework that is capable of modeling and reasoning about a wide range of cryptographic schemes, security definitions, and assumptions. Security is proven in the computational model, and the proof provides concrete bounds as well as asymptotic conclusions. FCF provides a language for probabilistic programs, a theory that is used to reason about programs, and a library of tactics and definitions that are useful in proofs about cryptography. The framework is designed to leverage fully the existing theory and capabilities of the Coq proof assistant in order to reduce the effort required to develop proofs.
Medical Food to Stop the Progression of Parkinson’s Disease  [PDF]
Don McCammon
Advances in Parkinson's Disease (APD) , 2014, DOI: 10.4236/apd.2014.32003

No progress has been made in the development of drugs to stop the progression of Parkinson’s Disease. Here the author has presented a novel approach to stopping the disease using a dietary supplement primarily composed of Mannitol. In vivo animal studies have shown that Mannitol was able to break up alpha-synuclein clusters and restore functioning in transgenic drosophila and mice. The author, who has Parkinson’s, used himself as a subject and was able to achieve similar results.

Fermions in Models with Wilson--Yukawa Couplings
M. F. L. Golterman,D. N. Petcher
Physics , 1992, DOI: 10.1016/0920-5632(92)90008-G
Abstract: Our work on models with Wilson--Yukawa couplings is reviewed. Conclusions include the failure of such models to produce continuum chiral gauge theories.
Chiral gauge theories with domain wall fermions
M. Golterman,K. Jansen,D. Petcher,J. Vink
Physics , 1993, DOI: 10.1016/0920-5632(94)90455-3
Abstract: We have investigated a proposal to construct chiral gauge theories on the lattice using domain wall fermions. The model contains two opposite chirality zeromodes, which live on two domain walls. We couple only one of them to a gauge field, but find that mirror fermions which also couple to the gauge field always seem to exist.
On the Eichten--Preskill Proposal for Lattice Chiral Gauge Theories
M. F. L. Golterman,D. N. Petcher,E. Rivas
Physics , 1992, DOI: 10.1016/0920-5632(92)90020-S
Abstract: We have studied the Eichten--Preskill proposal for constructing lattice chiral gauge theories using both strong and weak coupling methods. The results indicate that this proposal is unlikely to work due to a dynamical behavior similar to that of the Smit--Swift proposal, which also does not give rise to chiral fermions.
An Integrated Agent-Based Framework for Assessing Air Pollution Impacts  [PDF]
David Newth, Don Gunasekera
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.329132
Abstract: Air pollution has considerable impact on human health and the wellbeing. Thus many regions of the world have established air pollution standards to ensure a minimum level of air quality. Precise assessment of the health and socio-economic impacts of air pollution is, however, a complex task; indeed, methods based within an epidemiological tradition generally underestimate human risk of exposure to polluted air. In this study, we introduce an agent-based modeling approach to ascertaining the impact of changes in particulate matter (PM10) on mortality and frequency of hospital visits in the greater metropolitan region of Sydney, Australia. Our modeling approach simulates human movement and behavioral patterns in order to obtain an accurate estimate of individual exposure to a pollutant. Results of our analysis indicate that a 50% reduction in PM10 levels (relative to the baseline) could considerably lower mortality, respiratory hospital admissions and emergency room visits leading to reduced pressure on health care sector costs and placing lower stress on emergency medical facilities. Our analysis also highlights the continued need to avoid significant increases in air pollution in Sydney so that associated health impacts, including health care costs, do not increase.
SwiveLock Bone Anchor Stabilization of the Cranial Cruciate Ligament Deficient Stifle in Dogs: Clinical Outcome  [PDF]
Matthew Raske, Don Hulse
Open Journal of Veterinary Medicine (OJVM) , 2013, DOI: 10.4236/ojvm.2013.37048

A number of surgical procedures have been reported for the cranial cruciate ligament (CCL) deficient stifle in dogs. The objectives of this study were to report long-term outcomes in dogs with CCL deficient stifles stabilized with a knotless SwiveLock bone anchor preloaded with FiberTape and to report associated complications. Medical records were reviewed to identify dogs with unilateral CCL deficient stifles treated with the SwiveLock system (n = 41) between June 2008 and January 2012. Dogs were divided into three groups according to body weight to assess differences between owner assessed functional outcomes. Complications were recorded and a validated owner questionnaire was used to evaluate long-term outcomes at least 6 months postoperatively. Owner assessment prior to and after treatment with the SwiveLock system was statistically significant for each of the categories of the validated owner questionnaire. There was no significant difference among the weight groups for any of the preoperative and postoperative treatment owner questions. Complications requiring surgical revision occurred in three (7.3%) dogs. Two had surgical site infections and one had a subsequent meniscal tear. The authors concluded that the SwiveLock system placed at near isometric sites is an effective surgical option for the treatment of dogs with CCL deficient stifles.

Acidulation and Regeneration of Bamboo Derived Sorbents for Gas Phase Adsorption of Elemental Mercury  [PDF]
Naved Siddiqui, Jarlen Don
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.102008
Abstract: This paper presents results that illustrate the recycling of a bamboo derived sorbent used for the capture of elemental mercury (Hg0). The bamboo derived sorbent used is essentially a HCl functionalized activated carbon prepared from carbonization and CO2 activation of raw bamboo, that could potentially provide an alternative way to existing methods in removing mercury from flue gases from coal-fired plants. In this study, the bamboo derived sorbents were tested in a batch test using a mercury permeation tube as the source and nitrogen as a carrier gas. The recycling or regeneration of an activated carbon is an important issue to address from a coal-fired power plant point of view, and an attempt has been made to test the behavior of bamboo derived sorbents with various treatments including carbonized, carbonized-activated, carbonized-activated-acidulated, and then a follow-up recycled run after sample treatments in gas phase. From the study, it was found that bamboo derived activated carbon can be successfully acidulated using various normalities of HCl where weak solutions can be very effective in functionalizing the surface of the sorbent and capturing mercury. In order to recycle and reuse bamboo derived sorbents, stronger normalities of HCl would be desired.
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