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Search Results: 1 - 10 of 120570 matches for " Nathan T. Georgette "
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Predicting the Herd Immunity Threshold during an Outbreak: A Recursive Approach
Nathan T. Georgette
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0004168
Abstract: Background The objective was to develop a novel algorithm that can predict, based on field survey data, the minimum vaccination coverage required to reduce the mean number of infections per infectious individual to less than one (the Outbreak Response Immunization Threshold or ORIT) from up to six days in the advance. Methodology/Principal Findings First, the relationship between the rate of immunization and the ORIT was analyzed to establish a link. This relationship served as the basis for the development of a recursive algorithm that predicts the ORIT using survey data from two consecutive days. The algorithm was tested using data from two actual measles outbreaks. The prediction day difference (PDD) was defined as the number of days between the second day of data input and the day of the prediction. The effects of different PDDs on the prediction error were analyzed, and it was found that a PDD of 5 minimized the error in the prediction. In addition, I developed a model demonstrating the relationship between changes in the vaccination coverage and changes in the individual reproduction number. Conclusions/Significance The predictive algorithm for the ORIT generates a viable prediction of the minimum number of vaccines required to stop an outbreak in real time. With this knowledge, the outbreak control agency may plan to expend the lowest amount of funds required stop an outbreak, allowing the diversion of the funds saved to other areas of medical need.
Application of ANN and MLR Models on Groundwater Quality Using CWQI at Lawspet, Puducherry in India  [PDF]
N. Suresh Nathan, R. Saravanane, T. Sundararajan
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.53008
Abstract: With respect to groundwater deterioration from human activities a unique situation of co-disposal of non-engineered Municipal Solid Waste (MSW) dumping and Secondary Wastewater (SWW) disposal on land prevails simultaneously within the same campus at Puducherry in India. Broadly the objective of the study is to apply and compare Artificial Neural Network (ANN) and Multi Linear Regression (MLR) models on groundwater quality applying Canadian Water Quality Index (CWQI). Totally, 1065 water samples from 68 bore wells were collected for two years on monthly basis and tested for 17 physio-chemical and bacteriological parameters. However the study was restricted to the pollution aspects of 10 physio-chemical parameters such as EC, TDS, TH, \"\" , Cl-, \"\" , Na+, Ca2+, Mg2+ and K+. As there is wide spatial variation (2 to 3 km radius) with ground elevation (more than 45 m) among the bore wells it is appropriate to study the groundwater quality using Multivariate Statistical Analysis and ANN. The selected ten parameters were subjected to Hierarchical Cluster Analysis (HCA) and the clustering procedure generated three well defined clusters. Cluster wise important physio-chemical attributes which were altered by MSW and SWW operations, are statistically assessed. The CWQI was evolved with the objective to deliver a mechanism for interpreting the water quality data for all three clusters. The ANOVA test results viz., F-statistic (F = 134.55) and p-value (p = 0.000 < 0.05) showed that there are significant changes in the average values of CWQI among the three clusters, thereby confirming the formation of clusters due to anthropogenic activities. The CWQI simulation was performed using MLR and ANN models for all three clusters. Totally, 1 MLR and 9 ANN models were considered for simulation. Further the performances of ten models were compared using R2, RMSE and MAE (quantitative indicators). The analyses of the results revealed that both MLR and ANN models were fairly good in predicting the CWQI in Clusters 1 and 2 with high R2, low RMSE and MAE values but in Cluster 3 only ANN model fared well. Thus this study will be very useful to decision makers in solving water quality problems.
Spatial Variability of Ground Water Quality Using HCA, PCA and MANOVA at Lawspet, Puducherry in India  [PDF]
N. Suresh Nathan, R. Saravanane, T. Sundararajan
Computational Water, Energy, and Environmental Engineering (CWEEE) , 2017, DOI: 10.4236/cweee.2017.63017
Abstract: In ground water quality studies multivariate statistical techniques like Hierarchical Cluster Analysis (HCA), Principal Component Analysis (PCA), Factor Analysis (FA) and Multivariate Analysis of Variance (MANOVA) were employed to evaluate the principal factors and mechanisms governing the spatial variations and to assess source apportionment at Lawspet area in Puducherry, India. PCA/FA has made the first known factor which showed the anthropogenic impact on ground water quality and this dominant factor explained 82.79% of the total variance. The other four factors identified geogenic and hardness components. The distribution of first factor scores portray high loading for EC, TDS, Na+ and Cl (anthropogenic) in south east and south west parts of the study area, whereas other factor scores depict high loading for HCO3, Mg2+, Ca2+ and TH (hardness and geogenic) in the north west and south west parts of the study area. K+ and SO42 (geogenic) are dominant in south eastern direction. Further MANOVA showed that there are significant differences between ground water quality parameters. The spatial distribution maps of water quality parameters have rendered a powerful and practical visual tool for defining, interpreting, and distinguishing the anthropogenic, hardness and geogenic factors in the study area. Further the study indicated that multivariate statistical methods have successfully assessed the ground water qualitatively and spatially with a more effective step towards ground water quality management.
Materials in Eighteenth-Century Science: A Historical Ontology by Ursula Klein and Wolfgang Lefèvre
Georgette Taylor
Aestimatio : Critical Reviews in the History of Science , 2007,
$SLE(κ,ρ)$ processes, hiding exponents and self-avoiding walks in a wedge
Nathan Deutscher,Murray T. Batchelor
Physics , 2007, DOI: 10.1088/1751-8113/41/3/035001
Abstract: This article employs Schramm-Loewner Evolution to obtain intersection exponents for several chordal $SLE_{8/3}$ curves in a wedge. As $SLE_{8/3}$ is believed to describe the continuum limit of self-avoiding walks, these exponents correspond to those obtained by Cardy, Duplantier and Saleur for self-avoiding walks in an arbitrary wedge-shaped geometry using conformal invariance based arguments. Our approach builds on work by Werner, where the restriction property for $SLE(\kappa,\rho)$ processes and an absolute continuity relation allow the calculation of such exponents in the half-plane. Furthermore, the method by which these results are extended is general enough to apply to the new class of hiding exponents introduced by Werner.
Pose L,Georgette;
Revista chilena de radiología , 2005, DOI: 10.4067/S0717-93082005000200008
Abstract: lesions affecting bone and cartilage are common clinical conditions in children and teenagers during sport related activities. this article reviews the x-ray, ultrasound, ct and mri findings in these pathologic conditions
Estudio de las imágenes en el diagnóstico del cáncer infantil
Georgette Pose L.
Revista chilena de pediatría , 2001,
Georgette Pose L
Revista Chilena de Radiología , 2005,
Abstract: Las lesiones provocadas por la práctica deportiva han aumentado significativamente. Esta revisión enfatiza las lesiones osteocartilaginosas que se producen especial o exclusivamente en ni os y adolescentes, cuyo diagnóstico hasta hace algunos a os era clínico y la contribución de las imágenes se limitaba a estudios radiológicos simples. Los avances de otras técnicas, especialmente el ultrasonido y la resonancia magnética, han llegado a ser actualmente el método primario de elección ante la sospecha o evidencia clínica de una lesión de partes blandas u osteocartilaginosas Lesions affecting bone and cartilage are common clinical conditions in children and teenagers during sport related activities. This article reviews the X-ray, ultrasound, CT and MRI findings in these pathologic conditions
Trouble déficitaire de l’attention à l’université
France Landry,Georgette Goupil
Revue Internationale de Pédagogie de l’Enseignement Supérieur , 2011,
Abstract: Cet article présente un portrait du trouble déficitaire de l’attention avec ou sans hyperactivité (TDA/H) chez les adultes et, plus particulièrement, chez les étudiants universitaires. Après avoir défini le TDA/H, le texte expose les défis de ces étudiants et la situation des universités québécoises sur cette question. La deuxième partie illustre un exemple d’intervention auprès de ces étudiants, soit un programme de tutorat appliqué à l’Université du Québec à Montréal. This article presents a descriptive portrait of Attention Deficit Hyperactivity Disorder (ADHD) in adults, more particularly in university students. After describing ADHD, we will look at the many challenges those students may encounter during their university studies. Moreover, we will present a tutoring program that is currently taking place at the University of Québec in Montréal (UQAM).
Faut-il br ler les dictionnaires ? Ou comment les ressources numériques ont révolutionné les recherches en morphologie
Dal Georgette,Namer Fiammetta
SHS Web of Conferences , 2012, DOI: 10.1051/shsconf/20120100217
Abstract: Pour mener leurs études, les morphologues, et, singulièrement parmi eux, ceux qui traitent du lexique construit, sont pris entre deux tensions : utiliser les données issues des dictionnaires, réputées fiables parce que passées au travers du crible de l’institutionnalisation, ou se fonder sur des données authentiques, produites dans des situations écologiques. Bien qu’inspirant encore de la défiance, le Web devient alors la ressource par excellence. Les ressources numérisées telles que les archives de journaux ou les bases de données de textes littéraires constituent un moyen terme entre ces deux pratiques : elles permettent d’effectuer des recherches basées sur l’usage, tout en offrant la garantie d’une certaine tenue linguistique de la part des scripteurs, la plupart du temps identifiables. Dans cette communication, nous nous demanderons si les dictionnaires méritent la confiance que continuent de leur octroyer les morphologues ou, plus exactement, si une morphologie qui puise ses données dans les seuls dictionnaires peut encore avoir cours au 21e siècle. Pour engager cette discussion, nous commencerons par poser la question de l’existence, pour un lexème construit. Nous exposerons ensuite ce que constitue une morphologie basée sur l’usage, puis donnerons un aper u des types de recherches que permettent de réaliser les ressources non dictionnairiques. La conclusion sera que, si les dictionnaires continuent d'avoir droit de cité dans la panoplie du morphologue, une morphologie uniquement basée sur les données qu'ils contiennent passerait outre de nombreuses recherches, plus fructueuses les unes que les autres.
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