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Search Results: 1 - 10 of 465587 matches for " Timothy A. Anake "
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One-Step Implicit Hybrid Block Method for The Direct Solution of General Second Order Ordinary Differential Equations
Timothy A. Anake,David O. Awoyemi,Adetola O. Adesanya
IAENG International Journal of Applied Mathematics , 2012,
Abstract:
Optimization of Urban Rail Transportation in Emerging Countries Using Operational Research Techniques  [PDF]
M. C. Agarana, T. A. Anake, H. I. Okagbue
Applied Mathematics (AM) , 2016, DOI: 10.4236/am.2016.710099
Abstract: Rail systems are gradually becoming the most desirable form of transit infrastructure around the world, partly because they are becoming more environmentally friendly compared with airplanes and automobiles. This paper examines the place of emerging countries in this move of implementing modern rail system that will eventually enhance the realization of a low-carbon society. Network model, transportation model and linear programming algorithms are used to model the present urban rail transport system in Nigeria, as an emerging country, in order to optimize it. Operational research methods, including simplex method and MODI, with the aids of computer software (excel solver and LIP solver) were adopted to solve the resulting models. The results showed that optimization of rail transport system will not only reduce carbon emission but also bring about economic development which is required for the eradication of prevalent poverty in these emerging countries.
Put-Call Parity in Equity Options Markets: Recent Evidence  [PDF]
Timothy A. Krause
Theoretical Economics Letters (TEL) , 2019, DOI: 10.4236/tel.2019.94039
Abstract: There have been various studies of potential violations of put-call parity in US equity options markets, and the purpose of this study is to examine one potential explanation of these anomalous results. Cremers and Weinbaum [1] indicate a potential trading strategy that can obtain excess returns of up to 50 basis points per week, which is quite remarkable. However, none of these studies consider the fact that options markets have historically maintained different trading hours than those of their underlying security markets. While the US stock market has traditionally closed at 3:00 PM CST, options markets have variously closed between 3:10 and 3:02 PM CST over the past two decades. Using over ten million individual options implied volatility estimations since 1996, it is documented that these anomalies have all but disappeared since stock and option markets synchronized their trading hours. Beginning in the late 1990’s, stock prices often move slightly or to a larger degree in “after-hours” trading, enabled by the advent of electronic trading platforms. Options markets that are still open may adjust to subsequent stock market movements, although closing stock prices are reported as of 3:00 PM CST. Prior studies may have ignored these effects, and this is the first study to indicate that apparent deviations from put-call parity have decreased markedly over recent years, if they were ever economically significant at all.
Drugs and Cosmetics from the Sea
Anake Kijjoa,Pichan Sawangwong
Marine Drugs , 2004, DOI: 10.3390/md202073
Abstract: The marine environment is a rich source of both biological and chemical diversity. This diversity has been the source of unique chemical compounds with the potential for industrial development as pharmaceuticals, cosmetics, nutritional supplements, molecular probes, fine chemicals and agrochemicals. In recent years, a significant number of novel metabolites with potent pharmacological properties has been discovered from the marine organisms. Although there are only a few marine-derived products currently on the market, several robust new compounds derived from marine natural products are now in the clinical pipeline, with more clinical development. While the marine world offers an extremely rich resource for novel compounds, it also represents a great challenge that requires inputs from various scientific areas to bring the marine chemical diversity up to its therapeutic potential.
Analytical Relevance of Trace Metal Speciation in Environmental and Biophysicochemical Systems  [PDF]
Nsikak U. Benson, Winifred U. Anake, Ifedolapo O. Olanrewaju
American Journal of Analytical Chemistry (AJAC) , 2013, DOI: 10.4236/ajac.2013.411075
Abstract: This article presents a review of the analytical relevance of trace metal speciation analysis, which must be considered in environmental and biophysicochemical systems for reliable and efficient assessment and monitoring of trace metals. Examples are given of methodological approaches used for speciation analysis. An overview of speciation analysis in sediments, aquatic ecosystems and agrosystems is also presented.
Development of Teachers’ Mathematical Knowledge for Teaching by Using the Innovation of Lesson Study and Open Approach  [PDF]
Anake Sudejamnong, Kittipot Robsouk, Suladda Loipha, Maitree Inprasitha
Sociology Mind (SM) , 2014, DOI: 10.4236/sm.2014.44032
Abstract: This research was under context of professional development for mathematics teacher by using the innovation of lesson study and open approach project implemented by the Center for Research in Mathematics Education, Faculty of Education, Khon Kaen University, during 2009-2011 academic years. The objective of this research was to study the development of mathematical knowledge for teaching of teacher from working based on 3 steps of the lesson study cycle that incorporated 4 phases of open approach. The target groups were a lesson study team in a project school. Data were collected from 3 steps of lesson study and analysis procedures were based on analyzing videos, protocols, and descriptive analysis. The research found that the teachers obtained development as follows: 1) during the step of collaboratively design research lesson, they discussed and shared knowledge in the mathematical textbooks of project, discussion in objective of the lesson and construction of open-ended problem situation, anticipation for students’ thinking, and specification of issues for discussion in classroom; 2) in the step of teaching and collaboratively observing the research lesson, they obtained knowledge for teaching by presenting the open-ended problem situation, the occurred difficulty of students’ problem solving, the students’ thinking approach in problem solving, the association of approach in each learning unit, the sequencing of thinking, and the extension of students’ incomplete thinking approach; and 3) during the step of collaboratively reflection on teaching practice, teachers obtained knowledge by reflecting the students’ goal accomplishment, the students’ learning process, the students’ thinking approach, the efficiency of media, and the experts’ recommendations.
Kernel Density Estimation of Tropical Cyclone Frequencies in the North Atlantic Basin  [PDF]
Timothy A. Joyner, Robert V. Rohli
International Journal of Geosciences (IJG) , 2010, DOI: 10.4236/ijg.2010.13016
Abstract: Previous research has identified specific areas of frequent tropical cyclone activity in the North Atlantic basin. This study examines long-term and decadal spatio-temporal patterns of Atlantic tropical cyclone frequencies from 1944 to 2009, and analyzes categorical and decadal centroid patterns using kernel density estimation (KDE) and centrographic statistics. Results corroborate previous research which has suggested that the Bermuda-Azores anticyclone plays an integral role in the direction of tropical cyclone tracks. Other teleconnections such as the North Atlantic Oscillation (NAO) may also have an impact on tropical cyclone tracks, but at a different temporal resolution. Results expand on existing knowledge of the spatial trends of tropical cyclones based on storm category and time through the use of spatial statistics. Overall, location of peak frequency varies by tropical cyclone category, with stronger storms being more concentrated in narrow regions of the southern Caribbean Sea and Gulf of Mexico, while weaker storms occur in a much larger area that encompasses much of the Caribbean Sea, Gulf of Mexico, and Atlantic Ocean off of the east coast of the United States. Additionally, the decadal centroids of tropical cyclone tracks have oscillated over a large area of the Atlantic Ocean for much of recorded history. Data collected since 1944 can be analyzed confidently to reveal these patterns.
Impact of Videoconference with Native English Speakers on Chinese EFL Learners’ Oral Competence and Self-Confidence  [PDF]
Ruiling Lu, Timothy A. Goodale, Yanbing Guo
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.22008
Abstract:

This study presents an educational collaborative project between two colleges in the United States and China. Forty-five Chinese preservice teachers and 5 American undergraduates participated in the project which involved a 10-week online synchronous videoconference between the participants. The project aimed at improving Chinese EFL learners’ English oral skills as well as their confidence in teaching English language in future. Quasi-experiment design was employed to evaluate the effectiveness of the project. Results showed that online synchronous videoconference with native English speakers did have positive impacts on Chinese participants’ English pronunciation and oral fluency & coherent. No significant difference was found in confidence measures. The outcomes of the project contribute to the relevant literature with an applicable and low-cost English language training model for EFL learners.

Ant Species Differences Determined by Epistasis between Brood and Worker Genomes
Timothy A. Linksvayer
PLOS ONE , 2007, DOI: 10.1371/journal.pone.0000994
Abstract: Epistasis arising from physiological interactions between gene products often contributes to species differences, particularly those involved in reproductive isolation. In social organisms, phenotypes are influenced by the genotypes of multiple interacting individuals. In theory, social interactions can give rise to an additional type of epistasis between the genomes of social partners that can contribute to species differences. Using a full-factorial cross-fostering design with three species of closely related Temnothorax ants, I found that adult worker size was determined by an interaction between the genotypes of developing brood and care-giving workers, i.e. intergenomic epistasis. Such intergenomic social epistasis provides a strong signature of coevolution between social partners. These results demonstrate that just as physiologically interacting genes coevolve, diverge, and contribute to species differences, so do socially interacting genes. Coevolution and conflict between social partners, especially relatives such as parents and offspring, has long been recognized as having widespread evolutionary effects. This coevolutionary process may often result in coevolved socially-interacting gene complexes that contribute to species differences.
"Motorcycle Myth: Rebels without a Horse"
Timothy A. D. Holmes
International Journal of Motorcycle Studies , 2007,
Abstract:
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