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Search Results: 1 - 10 of 6162 matches for " Chris Poulton "
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Complete spectral gap in coupled dielectric waveguides embedded into metal
Wei Liu,Andrey Sukhorukov,Andrey Miroshnichenko,Chris Poulton,Zhiyong Xu,Dragomir Neshev,Yuri Kivshar
Physics , 2010, DOI: 10.1063/1.3458694
Abstract: We study a plasmonic coupler involving backward (TM_01) and forward (HE_11) modes of dielectric waveguides embedded into infinite metal. The simultaneously achievable contradirectional energy flows and codirectional wavevectors in different channels lead to a spectral gap, despite the absence of periodic structures along the waveguide. We demonstrate that a complete spectral gap can be achieved in a symmetric structure composed of four coupled waveguides.
Where Did Einstein's Ideas Come From?
Janette Poulton
Analytic Teaching and Philosophical Praxis , 1998,
Abstract: In this article I will discuss my work with undergraduate ‘non-philosophers’ at Royal Melbourne University of Technology. Students enrol in courses such as engineering, accountancy, nursing, fine arts, etc., and in addition must complete four of the subjects offered by the Context Curriculum Unit, which has employed me as a philosopher teaching the subjects Moral Issues in a Scientific Age, Tradition and Change, Search for Meaning and Culture and Creativity since 1988. This Unit was established in 1986 to assist students in meeting international standards of professional behaviour, and avowedly to help produce graduates who are knowledga-ble, creative, critical, responsible and employa-ble. Since 1991 I have been using strategies I have acquired working with practitioners of Phi-losophy for Children in various educational con-texts as a means of achieving these ends.
Almost split sequences for Knorr lattices
Andrew Poulton
Mathematics , 2013,
Abstract: Let $O$ be a complete d.v.r. and $G$ a finite group. We give two applications of an adjunction in the stable category of $OG$. The first application gives necessary and sufficient conditions for the middle term of an almost split sequence terminating in a Knorr lattice to be indecomposable. The second characterises the stable endomorphism rings of Heller lattices of kG-modules.
Waveguiding and Plasmon Resonances in Two-Dimensional Photonic Lattices of Gold and Silver Nanowires
Markus A. Schmidt,Luis N. Prill Sempere,Hemant K. Tyagi,Chris G. Poulton,Philip St. J. Russell
Physics , 2007, DOI: 10.1103/PhysRevB.77.033417
Abstract: We report the fabrication of triangular lattices of parallel gold and silver nanowires of high optical quality, with diameters down to 500 nm and length-to-diameter ratios as high as 100,000. The nanowires are supported by a silica glass matrix and are disposed around a central solid glass core, i.e., a missing nanowire. These cm-long structures make it possible to trap light within an array of nanowires and characterize the plasmon resonances that form at specific optical frequencies. Such nanowire arrays have many potential applications, e.g., to imaging on the sub-wavelength scale.
Maps admitting trialities but not dualities
Gareth A. Jones,Andrew Poulton
Mathematics , 2009,
Abstract: We use group theory to construct infinite families of maps on surfaces which are invariant under Wilson's map operations of order 3 but not under the operations of order 2, such as duality and Petrie duality.
Prenatal Vitamin D Supplementation and Child Respiratory Health: A Randomised Controlled Trial
Stephen T. Goldring, Chris J. Griffiths, Adrian R. Martineau, Stephen Robinson, Christina Yu, Sheree Poulton, Jane C. Kirkby, Janet Stocks, Richard Hooper, Seif O. Shaheen, John O. Warner, Robert J. Boyle
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0066627
Abstract: Background Observational studies suggest high prenatal vitamin D intake may be associated with reduced childhood wheezing. We examined the effect of prenatal vitamin D on childhood wheezing in an interventional study. Methods We randomised 180 pregnant women at 27 weeks gestation to either no vitamin D, 800 IU ergocalciferol daily until delivery or single oral bolus of 200,000 IU cholecalciferol, in an ethnically stratified, randomised controlled trial. Supplementation improved but did not optimise vitamin D status. Researchers blind to allocation assessed offspring at 3 years. Primary outcome was any history of wheeze assessed by validated questionnaire. Secondary outcomes included atopy, respiratory infection, impulse oscillometry and exhaled nitric oxide. Primary analyses used logistic and linear regression. Results We evaluated 158 of 180 (88%) offspring at age 3 years for the primary outcome. Atopy was assessed by skin test for 95 children (53%), serum IgE for 86 (48%), exhaled nitric oxide for 62 (34%) and impulse oscillometry of acceptable quality for 51 (28%). We found no difference between supplemented and control groups in risk of wheeze [no vitamin D: 14/50 (28%); any vitamin D: 26/108 (24%) (risk ratio 0.86; 95% confidence interval 0.49, 1.50; P = 0.69)]. There was no significant difference in atopy, eczema risk, lung function or exhaled nitric oxide between supplemented groups and controls. Conclusion Prenatal vitamin D supplementation in late pregnancy that had a modest effect on cord blood vitamin D level, was not associated with decreased wheezing in offspring at age three years. Trial Registration Controlled-Trials.com ISRCTN68645785
Responses of Macroinvertebrate Community Metrics to a Wastewater Discharge in the Upper Blue River of Kansas and Missouri, USA  [PDF]
Barry C. Poulton, Jennifer L. Graham, Teresa J. Rasmussen, Mandy L. Stone, Mandy L. Stone
Journal of Water Resource and Protection (JWARP) , 2015, DOI: 10.4236/jwarp.2015.715098
Abstract: The Blue River Main wastewater treatment facility (WWTF) discharges into the upper Blue River (725 km2), and is recently upgraded to implement biological nutrient removal. We measured biotic condition upstream and downstream of the discharge utilizing the macroinvertebrate protocol developed for Kansas streams. We examined responses of 34 metrics to determine the best indicators for discriminating site differences and for predicting biological condition. Significant differences between sites upstream and downstream of the discharge were identified for 15 metrics in April and 12 metrics in August. Upstream biotic condition scores were significantly greater than scores at both downstream sites in April (p = 0.02), and in August the most downstream site was classified as non-biologically supporting. Thirteen EPT taxa (Ephemeroptera, Plecoptera, Trichoptera) considered intolerant of degraded stream quality were absent at one or both downstream sites. Increases in tolerance metrics and filtering macroinvertebrates, and a decline in ratio of scrapers to filterers all indicated effects of increased nutrient enrichment. Stepwise regressions identified several significant models containing a suite of metrics with low redundancy (R2 = 0.90 - 0.99). Based on the rapid decline in biological condition downstream of the discharge, the level of nutrient removal resulting from the facility upgrade (10% - 20%) was not enough to mitigate negative effects on macroinvertebrate communities.
The Riemann Hypothesis for Symmetrised Combinations of Zeta Functions
Ross C. McPhedran,Christopher G. Poulton
Physics , 2013,
Abstract: This paper studies combinations of the Riemann zeta function, based on one defined by P.R. Taylor, which was shown by him to have all its zeros on the critical line. With a rescaled complex argument, this is denoted here by ${\cal T}_-(s)$, and is considered together with a counterpart function ${\cal T}_+(s)$, symmetric rather than antisymmetric about the critical line. We prove that ${\cal T}_+(s)$ has all its zeros on the critical line, and that the zeros of both functions are all of first order. We establish a link between the zeros of ${\cal T}_-(s)$ and of ${\cal T}_+(s)$ with those of the zeros of the Riemann zeta function $\zeta(2 s-1)$, which enables us to prove that, if the Riemann hypothesis holds, then the distribution function of the zeros of $\zeta (2 s-1)$ agrees with those for ${\cal T}_-(s)$ and of ${\cal T}_+(s)$ in all terms which do not remain finite as $t\rightarrow \infty$.
The Stationary Distributions of a Class of Markov Chains  [PDF]
Chris Cannings
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.45105

The objective of this paper is to find the stationary distribution of a certain class of Markov chains arising in a biological population involved in a specific type of evolutionary conflict, known as Parkers model. In a population of such players, the result of repeated, infrequent, attempted invasions using strategies from{0,1,2,,m-1}, is a Markov chain. The stationary distributions of this class of chains, for m ε {3,4,,} are derived in terms of previously known integer sequences. The asymptotic distribution (for m →∞) is derived.

The Prevalence of Sexual Partner Concurrency Is Not Correlated with Markers of Poverty or Gender Inequality: An Ecological Analysis  [PDF]
Chris Kenyon
World Journal of AIDS (WJA) , 2015, DOI: 10.4236/wja.2015.54035
Abstract: High rates of overlapping sexual relationships (concurrency) are believed to be important in the generation of generalized HIV epidemics in sub-Saharan Africa. Different authors favor socioeconomic, gender-equity or cultural explanations for the high concurrency rates in this region. We performed linear regression to analyze the association between the point-prevalence of concurrency in 15 - 49 years old males and various indicators of socioeconomic status and gender-equity using data from 11 countries surveyed in 1989/1990. We found no meaningful association between concurrency and the various markers of socioeconomic status and gender-equity. This analysis supports the findings of other studies that high concurrency rates in sub-Saharan Africa could be reduced without having to address socioeconomic and gender-equity factors.
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