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Athletic Scholarships and the Politics of Child Rearing in Canada
Noel Dyck
Anthropological Notebooks , 2006, DOI: 1234567
Abstract: Organized competitive community sports for children and youth have become popular activities in contemporary Canadian society and are eagerly supported by many parents who view these as socially appropriate pastimes for sons and daughters. Children’s achievement of athletic success tends to be viewed by many parents as a sign of their relative preparedness to confront and manage the future social and economic challenges of adulthood. Athletic success at different levels is also taken to demonstrate the adequacy of parents’ attempts to attend appropriately to the responsibilities of child rearing. This essay examines the particular attractions provided by the possibility of athletically accomplished children eventually winning paid athletic scholarships to attend colleges and universities in the United States. The paper asks why so many middle-class parents who are able to afford the cost of underwriting post-secondary education for sons and daughters nonetheless commit so much of their own time and resources, not to mention those of their children, to the pursuit of athletic scholarships in the USA.
Assessment of Port Efficiency in West Africa Using Data Envelopment Analysis  [PDF]
George Kobina van Dyck
American Journal of Industrial and Business Management (AJIBM) , 2015, DOI: 10.4236/ajibm.2015.54023
Abstract: The aim of this paper is to apply the DEA method in assessing efficiencies of major ports in West Africa. Six ports were selected based on their container throughput levels, and the DEA model was used to determine their relative efficiencies and their efficiencies over time through window analysis. The DEA model was applied to a number of inputs of port production and a single output (container throughput). It was determined that the Port of Tema in Ghana was the most efficient West African port under study. Although Tema exhibited some inefficiency in its operations, the port was found to make good use of its resources for production. On the other extreme, the Port of Cotonou in Benin was found to be the least efficient port obtaining the lowest average efficiency rating over a seven year period. It was determined that the port exhibited a substantial waste in production. Generally, ports in West Africa could be said to exhibit high levels of efficiency con-sidering that four out of six ports had an average efficiency score of 76% or higher for the period under study.
Multi-Criteria Evaluation of Port Competitiveness in West Africa Using Analytic Hierarchy Process (AHP)  [PDF]
George Kobina van Dyck, Hawa Mohamed Ismael
American Journal of Industrial and Business Management (AJIBM) , 2015, DOI: 10.4236/ajibm.2015.56043
Abstract: In the last decade, inter-port competition in West Africa has become fiercer as captive hinterlands of ports continue to overlap and become contestable or shared. This is due to door-to-door supply chain services being offered by shipping lines and third party logistics service providers through inter-modalism. In addition, as cargo becomes more concentrated in the region, there have been calls for the selection of a hub location for shipping lines serving the region in order to exploit economies of scale. This paper therefore aims to evaluate the competitiveness of major ports in the West African region based on criteria selected by experts. Using the Analytic Hierarchy Process, port competitiveness was evaluated and ports ranked according to the total weights obtained based on the different criteria used. The Port of Abidjan emerged the most competitive port in West Africa with its strongest links being its efficiency and performance, infrastructure and political stability outlook in spite of recent political turmoil. The Lagos Port Complex, West Africa’s largest port in terms of scale and throughput, emerged fifth falling behind the Ports of Lomé, Tema and Dakar respectively owing largely to its political stability outlook. The least competitive port was the Port of Cotonou in Benin.
Compressible and Choked Flows in Rotating Passages  [PDF]
Nolan J. Dyck, Anthony G. Straatman
Open Journal of Fluid Dynamics (OJFD) , 2019, DOI: 10.4236/ojfd.2019.91001
Abstract: The present study revisits the rotating duct problem examined by Polihronov and Straatman (J. Polihronov and A. G. Straatman, Phys. Rev. Lett. v. 109, p. 054504 (2012)). Starting from the general compressible Euler equations in a non-stationary reference frame closed form expressions for velocity, temperature, density and pressure along the duct are determined. The present results are more general than those obtained by Polihronov and Straatman, as the change of in-frame kinetic energy has been retained. The improvement of the present results over Polihronov and Straatman’s is demonstrated by comparison with the results of a computational fluid dynamics study. The new results have been further generalized to the case of a rotating duct with varying cross-sectional area, and again for a general curved passage in three-dimensional space. The work required or derived from the rotating duct has also been computed. The choked flow condition within the passage of varying cross-sectional area has been identified, along with the constraints which must be placed on the Mach, Rossby, and tip Mach numbers to avoid choked flow. Finally, a straightforward technique to identify any locations where an ideal rotating flow in a constrained passage will become sonic has been presented.
The Roles of One Thought Experiment in Interpreting Quantum Mechanics. Werner Heisenberg Meets Thomas Kuhn.
Maarten Van Dyck
Philosophica , 2003,
An Erd?s-Ko-Rado theorem for subset partitions
Adam Dyck,Karen Meagher
Mathematics , 2013,
Abstract: A $k\ell$-subset partition, or $(k,\ell)$-subpartition, is a $k\ell$-subset of an $n$-set that is partitioned into $\ell$ distinct classes, each of size $k$. Two $(k,\ell)$-subpartitions are said to $t$-intersect if they have at least $t$ classes in common. In this paper, we prove an Erd\H{o}s-Ko-Rado theorem for intersecting families of $(k,\ell)$-subpartitions. We show that for $n \geq k\ell$, $\ell \geq 2$ and $k \geq 3$, the largest $1$-intersecting family contains at most $\frac{1}{(\ell-1)!}\binom{n-k}{k}\binom{n-2k}{k}\cdots\binom{n-(\ell-1)k}{k}$ $(k,\ell)$-subpartitions, and that this bound is only attained by the family of $(k,\ell)$-subpartitions with a common fixed class, known as the \emph{canonical intersecting family of $(k,\ell)$-subpartitions}. Further, provided that $n$ is sufficiently large relative to $k,\ell$ and $t$, the largest $t$-intersecting family is the family of $(k,\ell)$-subpartitions that contain a common set of $t$ fixed classes.
Population Genetic Differences along a Latitudinal Cline between Original and Recently Colonized Habitat in a Butterfly
Sofie Vandewoestijne,Hans Van Dyck
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0013810
Abstract: Past and current range or spatial expansions have important consequences on population genetic structure. Habitat-use expansion, i.e. changing habitat associations, may also influence genetic population parameters, but has been less studied. Here we examined the genetic population structure of a Palaeartic woodland butterfly Pararge aegeria (Nymphalidae) which has recently colonized agricultural landscapes in NW-Europe. Butterflies from woodland and agricultural landscapes differ in several phenotypic traits (including morphology, behavior and life history). We investigated whether phenotypic divergence is accompanied by genetic divergence between populations of different landscapes along a 700 km latitudinal gradient.
Landscape Structure Shapes Habitat Finding Ability in a Butterfly
Erik ?ckinger, Hans Van Dyck
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041517
Abstract: Land-use intensification and habitat fragmentation is predicted to impact on the search strategies animals use to find habitat. We compared the habitat finding ability between populations of the speckled wood butterfly (Pararge aegeria L.) from landscapes that differ in degree of habitat fragmentation. Na?ve butterflies reared under standardized laboratory conditions but originating from either fragmented agricultural landscapes or more continuous forested landscapes were released in the field, at fixed distances from a target habitat patch, and their flight paths were recorded. Butterflies originating from fragmented agricultural landscapes were better able to find a woodlot habitat from a distance compared to conspecifics from continuous forested landscapes. To manipulate the access to olfactory information, a subset of individuals from both landscape types were included in an antennae removal experiment. This confirmed the longer perceptual range for butterflies from agricultural landscapes and indicated the significance of both visual and olfactory information for orientation towards habitat. Our results are consistent with selection for increased perceptual range in fragmented landscapes to reduce dispersal costs. An increased perceptual range will alter the functional connectivity and thereby the chances for population persistence for the same level of structural connectivity in a fragmented landscape.
Procedure for determining soil contamination in practice: view of ovam
Van Dyck E.,Wille E.
International Agrophysics , 1998,
Abstract: Procedure for determining soil contamination in practice in order to demonstrate soil pollution worked out by OVAM Public Waste Agency for the Flemish Region and the Flemish Government (Belgium) decree on soil decontamination is presented.
Utilization of the Teaching Strategies among Nurse Tutors in Malawi Nursing Colleges  [PDF]
Noel D. Mbirimtengerenji, Oluyinka Adejumo
Open Journal of Nursing (OJN) , 2015, DOI: 10.4236/ojn.2015.53031
Abstract: Background: There are numerous teaching strategies that suit the pedagogical learning, but not all can yield the desired outcome and be properly applied by nurse tutors in both classroom and clinical area. Therefore, identifying the utilization of the teaching strategy for nurse tutors is very detrimental in nursing education. Methods: Descriptive exploratory design which utilized both qualitative and sequential quantitative methods was applied to Iterated Purposive Probability Sampling (IPPS) of 10 nursing colleges in Malawi. This was done to 129 student and 82 nurse tutors in two structured questionnaires, 40 in-depth interviews and 10 focus groups. There were 56 variables for the teaching strategy under five ranked Likert scale and the Cronbach’s Alpha was found to be 0.964 without standardisation and it was 0.963 after standardisation. Results: Direct teaching strategies like the lecture method are very common although nurse tutors prefer to combine with other interactive instructions. There is statistical association of use of role play and group discussion methods and nurse tutor work experience with odds ratios of OR ≤ 1.624; CI(0.576 ± 4.579); p ≥ 0.359 and OR ≤ 1.397; CI(0.882 ± 2.306); p ≥ 0.147 respectively. The ability to use different teaching strategies competently is still very limited among nurse tutors in Malawi nursing colleges. This compromises quality of learning among nursing students in the colleges. Conclusion: Developing a new teaching strategy that could combine the different attributes in the variety of the teaching instructions can promote the quality of nursing education in Malawi.
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