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Search Results: 1 - 10 of 523 matches for " Will Perkins "
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Birthday Inequalities, Repulsion, and Hard Spheres
Will Perkins
Mathematics , 2015,
Abstract: We study a birthday inequality in random geometric graphs: the probability of the empty graph is upper bounded by the product of the probabilities that each edge is absent. We show the birthday inequality holds at low densities, but does not hold in general. We give three different applications of the birthday inequality in statistical physics and combinatorics: we prove lower bounds on the free energy of the hard sphere model and upper bounds on the number of independent sets and matchings of a given size in d-regular graphs. The birthday inequality is implied by a repulsion inequality: the expected volume of the union of spheres of radius r around n randomly placed centers increases if we condition on the event that the centers are at pairwise distance greater than r. Surprisingly we show that the repulsion inequality is not true in general, and in particular that it fails in 24-dimensional Euclidean space: conditioning on the pairwise repulsion of centers of 24-dimensional spheres can decrease the expected volume of their union.
Random k-SAT and the Power of Two Choices
Will Perkins
Computer Science , 2012,
Abstract: We study an Achlioptas-process version of the random k-SAT process: a bounded number of k-clauses are drawn uniformly at random at each step, and exactly one added to the growing formula according to a particular rule. We prove the existence of a rule that shifts the satisfiability threshold. This extends a well-studied area of probabilistic combinatorics (Achlioptas processes) to random CSP's. In particular, while a rule to delay the 2-SAT threshold was known previously, this is the first proof of a rule to shift the threshold of k-SAT for k >= 3. We then propose a gap decision problem based upon this semi-random model. The aim of the problem is to investigate the hardness of the random k-SAT decision problem, as opposed to the problem of finding an assignment or certificate of unsatisfiability. Finally, we discuss connections to the study of Achlioptas random graph processes.
The Antiparticles of Neutral Bosons  [PDF]
W. A. Perkins
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.412A1003
Abstract:

With the advent of the ability to create and study antihydrogen, we think it is appropriate to consider the possibility that antiphotons might not be identical to photons. First of all, we will look at the experimental evidence concerning multiple neutral pions and multiple photons. Because of its internal structure, the neutral kaon is not identical to its antiparticle. We will consider internal structures for the neutral pion and photon for which the antiparticle differs from the particle. Interestingly, the antiphoton thus created from neutrinos does not interact with electrons because its neutrinos have the wrong helicity.

Composite Photon Theory versus Elementary Photon Theory  [PDF]
Walton A. Perkins
Journal of Modern Physics (JMP) , 2014, DOI: 10.4236/jmp.2014.518205
Abstract: The purpose of this paper is to show that the composite photon theory measures up well against the Standard Model’s elementary photon theory. This is done by comparing the two theories, area by area. Although the predictions of quantum electrodynamics are in excellent agreement with experiment (as in the anomalous magnetic moment of the electron), there are some problems, such as the difficulty in describing the electromagnetic field with the four-component vector potential because the photon has only two polarization states. In most areas the two theories give similar results, so it is impossible to rule out the composite photon theory. Pryce’s arguments in 1938 against a composite photon theory are shown to be invalid or irrelevant. Recently, it has been realized that in the composite theory the antiphoton does not interact with matter because it is formed of a neutrino and an antineutrino with the wrong helicity. This leads to experimental tests that can determine which theory is correct.
Black Community College Students and Opinions and Beliefs on Weight in the Community: A Focus Group Study  [PDF]
Janna Stephens, Antoinette Perkins
Health (Health) , 2019, DOI: 10.4236/health.2019.111007
Abstract: Objective: The purpose of this study was to better understand black community college students’ beliefs on obesity in their community. Methods: Participants were 18 - 21 years old and African American/Hispanic Black. Focus group sessions were conducted with a discussion guide. Thematic analysis was used to analyze results. Results: Five focus groups were conducted. Four major themes emerged: My Culture Matters, The Effects of Slavery are Still Present, Meet Me Where I Want to Be, Not Where Society Wants Me, and If They Have Been Fat, They Get Me. It is clear that weight programs need to be sensitive to cultural preferences. Conclusion: Our results present unique factors related to overweight/obesity in the Black community.
Factors Underpinning at Least Three Years of Participant Adherence to a Community-Focused Modified Boxing Program  [PDF]
Paul Perkins, Allan Hahn
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.72023
Abstract: In Australia, a modified form of boxing aimed at maximising participant safety and enjoyment has existed since 2006. Known as Box’Tag, it precludes impacts to the head and neck, in accordance with recommendations of medical and other experts. It also makes use of automated scoring technology. From 2012-2016, a Box’Tag program was run at a Police Community Youth Club (PCYC) in Canberra, Australia, with the first author of this paper as the coach. It rapidly grew to include more than 100 regular participants, which was ten times the number involved in a conventional boxing program that it replaced. During its term, it gradually evolved to increasingly take on characteristics that seemed to be valued by participants. Upon its closure, participants were asked to complete a Program Evaluation Form as part of standard PCYC procedure. Among participants who met this request, there were 38 (18 F, 20 M) who had been involved in the program for at least three years. We subsequently carried out thematic analysis of their written feedback to identify which aspects of the program had attracted them and were primarily responsible for their prolonged participation. Four major themes emerged, covering the program environment, the underlying concept, the timetable and the characteristics and outcomes of the training itself. Specifically, the environment was considered friendly, welcoming and supportive. The concept was seen to have extended beyond a sport program to encompass the establishment of a dynamic community brought together by a common interest. The program timetable was regarded as accommodating and flexible, and the training itself was described as safe, fun and beneficial in multiple respects. Overall, the participants expressed deep affection for the program. Our findings accord with those of other researchers who have sought to discern factors influencing adherence to sport and exercise programs and who now suggest that traditional, highly instructional approaches to the operation of such programs might contribute to participant dropout. Prolonged involvement in the Canberra PCYC Box’Tag program is explicable in terms of self-determination theory, in that the program seems to have provided conditions that supported participant growth in autonomy, competence and relatedness. A strong case exists for replication of these conditions in other settings.
La temporalidad como estructura de L'Action (1893) de Maurice Blondel
Perkins,Patricio;
T?3picos , 2010,
Abstract: this paper aims to offer an analysis of the estructure of maurice blondel's l'action (1893) in three different levels taking into account as a model the triadic configuration of temporality. the first level is implicit in the analysis of action made in the introduction to the work; the second level consists in the analysis of passivity described in the first moment of the fourth part; the third level contains the whole work in its global sense, extending itself to the phenomenon of action, the argument about the only necessary being and the alternative of action. i pretend to prove that the past, present and for-coming dimensions of temporality are at the base of the comprehension of this work.
La temporalidad como estructura de L'Action (1893) de Maurice Blondel
Patricio Perkins
T?3picos , 2010,
Abstract: El trabajo analiza la estructura de L'Action (1893) del filósofo francés Maurice Blondel en tres niveles diferentes según el modelo de la configuración triádica de la temporalidad. El primer nivel está implícito en la analítica de la acción llevada a cabo en la Introduction a la obra; el segundo nivel se identifica con el análisis de la pasividad del primer momento de la cuarta parte; el tercer nivel abarca la obra considerada en su globalidad, extendiéndose a la problemática del fenómeno de la acción, de la demostración del único ser necesario y de la alternativa de la acción. El análisis pretende demostrar que las dimensiones antecedente, presente y adveniente de la temporalidad están a la base de la comprensión de esta obra blondeliana. This paper aims to offer an analysis of the estructure of Maurice Blondel's L'Action (1893) in three different levels taking into account as a model the triadic configuration of temporality. The first level is implicit in the analysis of action made in the Introduction to the work; the second level consists in the analysis of passivity described in the first moment of the fourth part; the third level contains the whole work in its global sense, extending itself to the phenomenon of action, the argument about the only necessary being and the alternative of action. I pretend to prove that the past, present and for-coming dimensions of temporality are at the base of the comprehension of this work.
Trends in process systems engineering
John Perkins
Modeling, Identification and Control , 1994, DOI: 10.4173/mic.1994.3.7
Abstract: (No abstract)
Fatal drug-induced immune hemolytic anemia due to cefotetan; A case study
Perkins Jim
Asian Journal of Transfusion Science , 2008,
Abstract: A case is described here of drug-induced immune hemolytic anemia (DIIHA) due to cefotetan administered to a post-partum woman who received the drug for infection prophylaxis at the time of caesarean section. Renewed fatal hemolysis occurred when the drug was given a second time 12 days after the first dose. The initial immunohematologic findings included a positive direct antiglobulin test (DAT) due to IgG and complement coating of the patient′s RBCs as well as an eluate that did not react with RBCs in the absence of drug. The antibody was drug-dependent, reacting with both drug-coated RBCs as well as when the drug was added to a mixture of her serum and donor RBCs. Cefotetan has been a common cause of this uncommon problem. The clinical features of cefotetan DIIHA, classification of drug-induced antibodies, and the differential diagnosis of a positive DAT are briefly discussed.
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