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Search Results: 1 - 10 of 226308 matches for " R Nathan "
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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.
Risks identied in implementation of district clinical specialist teams
R Nathan, P Rautenbach
South African Medical Journal , 2013,
Abstract: The District Clinical Specialist Team (DCST) is a strategy implemented by the South African National Department of Health to strengthen district health systems. An amount of R396 million per annum will be required to fund posts in all 52 districts. During implementation, numerous risks were identified, the major one being the most expensive category of DCST personnel, i.e. Head of Clinical Unit. Similar risks will probably apply to other categories of personnel within the DCST. To achieve the objectives of the DCST strategy, risk reduction strategies need to be promptly applied.
Le Danemark au c ur de l’axe euro-scandinave
Nathan R. Grison
M@ppemonde , 2011,
Abstract: En donnant, en janvier 2011, son accord final en vue de la construction du tunnel du Fehmarn Belt, le gouvernement danois a réaffirmé son souhait de faire du royaume nordique le centre névralgique des échanges entre le continent européen et la Scandinavie…
Visualizing the Past: The Design of a Temporally Enabled Map for Presentation (TEMPO)
Nathan Prestopnik,Alan R. Foley
International Journal of Designs for Learning , 2012,
Abstract: We present a design case for a prototype visualization tool called the Temporally Enabled Map for Presentation (TEMPO). Designed for use in the lecture classroom, TEMPO is an interactive animated map that addressed a common problem in military history: the shortcomings of traditional static (non-interactive, non-animated) maps. Static maps show spatial elements well, but cannot do more than approximate temporal events using multiple views, movement arrows, and the like. TEMPO provides a more complete view of past historical events by showing them from start to finish. In our design case we describe our development process, which included consultation with military history domain experts, classroom observations, application of techniques derived from visualization and Human-Computer Interaction (HCI) literature and theory. Our design case shows how the design of an educational tool can motivate scholarly evaluation, and we describe how some theories were first embraced and then rejected as design circumstances required. Finally, we explore a future direction for TEMPO, tools to support creative interactions with visualizations where students or instructors can learn by visualizing historical events for themselves. A working version of the finished TEMPO artifact is included as an interactive element in this document.
Technology that Touches Lives: Teleconsultation to Benefit Persons with Upper Limb Loss
Lynsay R. Whelan,Nathan Wagner
International Journal of Telerehabilitation , 2011, DOI: 10.5195/ijt.2011.6080
Abstract: While over 1.5 million individuals are living with limb loss in the United States (Ziegler-Graham et al., 2008), only 10% of these individuals have a loss that affects an upper limb. Coincident with the relatively low incidence of upper limb loss, is a shortage of the community-based prosthetic rehabilitation experts that can help prosthetic users to more fully integrate their devices into their daily routines. This article describes how expert prosthetists and occupational therapists at Touch Bionics, a manufacturer of advanced upper limb prosthetic devices, employ Voice over the Internet Protocol (VoIP) videoconferencing software telehealth technologies to engage in remote consultation with users of prosthetic devices and/or their local practitioners. The Touch Bionics staff provide follow-up expertise to local prosthetists, occupational therapists, and other health professionals. Contrasted with prior telephone-based consultations, the video-enabled approach provides enhanced capabilities to benefit persons with upper limb loss. Currently, the opportunities for Touch Bionics occupational therapists to fully engage in patient-based services delivered through telehealth technologies are significantly reduced by their need to obtain and maintain professional licenses in multiple states.
Detection and tracing of the medical radioisotope 131I in the Canberra environment
Gilfillan Nathan R.,Timmers Heiko
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20123504002
Abstract: The transport and radioecology of the therapeutical radioisotope 131I has been studied in Canberra, Australia. The isotope has been detected in water samples and its activity quantified via characteristic J-ray photo peaks. A comparison of measurements on samples from upstream and downstream of the Canberra waste water treatment plant shows that 131I is discharged from the plant outflow into the local Molonglo river. This is consistent with observations in other urban environments. A time-correlation between the measured activities in the outflow and the therapeutical treatment cycle at the hospital identifies the medical treatment as the source of the isotope. Enhanced activity levels of 131I have been measured for fish samples. This may permit conclusions on 131I uptake by the biosphere. Due to the well-defined and intermittent input of 131I into the sewage, the Canberra situation is ideally suited for radioecological studies. Furthermore, the 131I activity may be applied in tracer studies of sewage transport to and through the treatment plant and as an indicator of outflow dilution following discharge to the environment.
Contextual and Perceptual Brain Processes Underlying Moral Cognition: A Quantitative Meta-Analysis of Moral Reasoning and Moral Emotions
Gunes Sevinc, R. Nathan Spreng
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0087427
Abstract: Background and Objectives Human morality has been investigated using a variety of tasks ranging from judgments of hypothetical dilemmas to viewing morally salient stimuli. These experiments have provided insight into neural correlates of moral judgments and emotions, yet these approaches reveal important differences in moral cognition. Moral reasoning tasks require active deliberation while moral emotion tasks involve the perception of stimuli with moral implications. We examined convergent and divergent brain activity associated with these experimental paradigms taking a quantitative meta-analytic approach. Data Source A systematic search of the literature yielded 40 studies. Studies involving explicit decisions in a moral situation were categorized as active (n = 22); studies evoking moral emotions were categorized as passive (n = 18). We conducted a coordinate-based meta-analysis using the Activation Likelihood Estimation to determine reliable patterns of brain activity. Results & Conclusions Results revealed a convergent pattern of reliable brain activity for both task categories in regions of the default network, consistent with the social and contextual information processes supported by this brain network. Active tasks revealed more reliable activity in the temporoparietal junction, angular gyrus and temporal pole. Active tasks demand deliberative reasoning and may disproportionately involve the retrieval of social knowledge from memory, mental state attribution, and construction of the context through associative processes. In contrast, passive tasks reliably engaged regions associated with visual and emotional information processing, including lingual gyrus and the amygdala. A laterality effect was observed in dorsomedial prefrontal cortex, with active tasks engaging the left, and passive tasks engaging the right. While overlapping activity patterns suggest a shared neural network for both tasks, differential activity suggests that processing of moral input is affected by task demands. The results provide novel insight into distinct features of moral cognition, including the generation of moral context through associative processes and the perceptual detection of moral salience.
Extremal Transitions and Five-Dimensional Supersymmetric Field Theories
David R. Morrison,Nathan Seiberg
Physics , 1996, DOI: 10.1016/S0550-3213(96)00592-5
Abstract: We study five-dimensional supersymmetric field theories with one-dimensional Coulomb branch. We extend a previous analysis which led to non-trivial fixed points with $E_n$ symmetry ($E_8$, $E_7$, $E_6$, $E_5=Spin(10)$, $E_4=SU(5)$, $E_3=SU(3)\times SU(2)$, $E_2=SU(2)\times U(1)$ and $E_1=SU(2)$) by finding two new theories: $\tilde E_1$ with $U(1)$ symmetry and $E_0$ with no symmetry. The latter is a non-trivial theory with no relevant operators preserving the super-Poincar\'e symmetry. In terms of string theory these new field theories enable us to describe compactifications of the type I' theory on $S^1/Z_2$ with 16, 17 or 18 background D8-branes. These theories also play a crucial role in compactifications of M-theory on Calabi--Yau spaces, providing physical models for the contractions of del Pezzo surfaces to points (thereby completing the classification of singularities which can occur at codimension one in K\"ahler moduli). The structure of the Higgs branch yields a prediction which unifies the known mathematical facts about del Pezzo transitions in a quite remarkable way.
A model for African trypanosome cell motility and quantitative description of flagellar dynamics
Nathan R. Hutchings,Andrei Ludu
Physics , 2004,
Abstract: A quantitative description of the flagellar dynamics in the procyclic T. brucei is presented in terms of stationary oscillations and traveling waves. By using digital video microscopy to quantify the kinematics of trypanosome flagellar waveforms. A theoretical model is build starting from a Bernoulli-Euler flexural-torsional model of an elastic string with internal distribution of force and torque. The dynamics is internally driven by the action of the molecular motors along the string, which is proportional to the local shift and consequently to the local curvature. The model equation is a nonlinear partial differential wave equation of order four, containing nonlinear terms specific to the Korteweg-de Vries (KdV) equation and the modified-KdV equation. For different ranges of parameters we obtained kink-like solitons, breather solitons, and a new class of solutions constructed by smoothly piece-wise connected conic functions arcs (e.g. ellipse). The predicted amplitude and wavelengths are in good match with experiments. We also present the hypotheses for a step-wise kinematical model of swimming of procyclic African trypanosome.
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