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Search Results: 1 - 10 of 1886 matches for " Laurence Copeland "
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The Cross-Sectional Risk Premium of Decomposed Market Volatility in UK Stock Market  [PDF]
Yan Yang, Laurence Copeland
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.27006

We decompose UK market volatility into short- and long-run components using EGARCH component model and examine the cross-sectional prices of the two components. Our empirical results suggest that these two components are significantly priced in the cross-section and the negative risk premia are consistent with the existing literature. The Fama-French three-factor model is improved by the inclusion of the two volatility components. However, our ICAPM model using market excess return and the decomposed volatility components as state variables compares inferiorly to the traditional three-factor model.

Meeting the Challenges for Agriculture
Les Copeland
Agriculture , 2011, DOI: 10.3390/agriculture1010001
Abstract: Ensuring food security is an ongoing global challenge. Many forecasts point to a need to increase food production by at least 70% if we are to feed the world’s projected population of nine billion in 2050. Recent volatility in commodity prices and the general upward trend in the cost of food are indicators that global food systems are now driven by demand rather than supply. There are various reasons for this: greater demand for animal protein with economic growth in developing countries; the continuing increase in world population; competition between food and bioenergy crops for land and water; low inventories of world grain stocks; reduced investment in agricultural R&D; and unfavorable weather resulting in a succession of poor harvests around the world. Increasing production of grains, which are the foundation of the human food supply, will have to be achieved through higher crop yields without boosting inputs of land, water and energy. Meeting community expectations for environmental stewardship and sustainability, and adapting food production to increasingly variable climate, add greatly to the challenge.
Continuous Maps on Digital Simple Closed Curves  [PDF]
Laurence Boxer
Applied Mathematics (AM) , 2010, DOI: 10.4236/am.2010.15050
Abstract: We give digital analogues of classical theorems of topology for continuous functions defined on spheres, for digital simple closed curves. In particular, we show the following. ? A digital simple closed curve of more than 4 points is not contractible, i.e., its identity map is not nullhomotopic in . ? Let and be digital simple closed curves, each symmetric with respect to the origin, such that (where is the number of points in ). Let be a digitally continuous antipodal map. Then is not nullho- motopic in . ? Let be a digital simple closed curve that is symmetric with respect to the origin. Let be a digitally continuous map. Then there is a pair of antipodes such that .
Making sense of nonsense: the evolution of selenocysteine usage in proteins
Paul R Copeland
Genome Biology , 2005, DOI: 10.1186/gb-2005-6-6-221
Abstract: As well as the 20 amino acids universally found in proteins, two other amino acids - pyrrolysine and selenocysteine - are incorporated into a small number of proteins in some groups of organisms. L-pyrrolysine is a C4-substituted pyrroline-5-carboxylate attached to the ε-nitrogen of lysine; L-seleno-cysteine is identical to cysteine but with selenium substituted for sulfur. Pyrrolysine has so far been found only in enzymes required for methanogenesis in some archaebacteria, suggesting a possible role in catalysis, but the precise role of this amino acid has not been identified. The selenium atom in selenocysteine confers a much higher reactivity than cysteine, as its lower pKa (5.2) allows it to remain ionized at physiological pH. Most selenoproteins use their higher nucleophilic activity to catalyze redox reactions, but many have no known function. The current studies of selenoprotein evolution represent one of the important tools used to completely identify and categorize selenoprotein function.The Sargasso Sea (named for the surface-borne sargassum seaweed) is a body of water covering 2 million square miles in the middle of the North Atlantic Ocean near Bermuda. Its well defined physical and geochemical properties, including relatively low nutrient levels, made it an alluring target for a shotgun sequencing project covering a whole biome - a collection of interrelated ecosystems typical of a particular physical environment [1]. This effort, the first 'biome sequencing project', represents a novel application for shotgun genome sequencing and is an important new component of modern bioinformatics. Of the 1.2 million genes identified by this approach, however, a small subset is likely to be misannotated because of the presence of in-frame nonsense codons, either UGA or UAG, which in these cases are acting as codons for selenocysteine and pyrrolysine, respectively. In some archaea, the UAG codon is redefined as a pyrrolysine codon, apparently forcing these organisms
Safeguarding Primary Healthcare: A Case Study of Barbados
Patricia Rodney,Esker Copeland
Social Medicine , 2010,
Abstract: The concept of primary health care has regained prominence as many countries around the globe face rising health costs and failed health systems. This study examines Barbados, a developing country in the eastern Caribbean, which has consistently included the concept of primary health care in all of its development plans. Based on the government's stated commitment to Health for All, this review was conducted to examine whether this focus has prevailed. The purpose of this paper was to identify some of the advancements or reversals of primary health care policy in Barbados.
Observations and Experiments on the Case-Building Instinct of TwoSpecies of Trichoptera
Manton Copeland,Sears Crowell
Psyche , 1937, DOI: 10.1155/1937/70785
Participation and the role of Public Space
Anna Gabriel Copeland
Public Space : the Journal of Law and Social Justice , 2008,
Abstract: This article examines participatory rights as human rights and considers their importance to the lives of children and young people. It argues that a broad definition of participation needs to be used which takes us from 'round tables' to understanding that young people participate in many different ways. It points out that failure to recognise and respect the many varied ways that children and young people choose to participate results in a breach of their human rights. It shows how our socio-legal system operates to permit and support these breaches of the rights of children and young people, resulting in their alienation from civic society.
String Cosmology
Edmund J Copeland
Physics , 2002,
Abstract: We present a brief review of recent advances in string cosmology. Starting with the Dilaton-Moduli Cosmology (known also as the Pre Big Bang), we go on to include the effects of axion fields and address the thorny issue of the Graceful Exit in String Cosmology. This is followed by a review of density perturbations arising in string cosmology and we finish with a brief introduction to the impact moving five branes can have on the Dilaton-Moduli cosmological solutions.
A Special Subgroup of the Surface Braid Group
D. Jeremy Copeland
Mathematics , 2004,
Abstract: Herein we prove that if $M$ is a compact oriented Riemann surface of genus $g$, and $M^{[n]}$ is the classifying space of $n$ distinct, unordered points on $M$, then the kernel of the map $\pi_1(M^{[n]})\to H_1(M)$ is generated by transpositions for sufficiently large $n$. Specifically, we treat $M$ as a polyhedron, and the edge set of $M$ generates this group.
Monodromy of the Hitchin Map over Hyperelliptic Curves
D. Jeremy Copeland
Mathematics , 2004,
Abstract: In this paper, we study the monodromy of the Hitchin fibration for rank 2 vector bundles over hyperelliptic curves. We reduce the problem to studying a surface braid group generalization of the classical Burau representation, and give a combinatorial method for computing this representation.
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