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Search Results: 1 - 10 of 20928 matches for " Ankesh Kumar "
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Characterization of ZnO substituted 45S5 Bioactive Glasses and Glass - Ceramics
Ankesh Kumar Srivastava,Ram Pyare
Journal of Materials Science Research , 2012, DOI: 10.5539/jmsr.v1n2p207
Abstract: ZnO substituted 45S5 bioactive - glasses and glass - ceramics were prepared. In vitro bioactivity of bioactive glasses and glass - ceramics, before and after exposed to simulated body fluid (SBF) solution for different time periods, were investigated by fourier transform infrared (FTIR) reflectance spectrometer with measuring the pH and the concentrations of silicon, sodium, calcium, phosphorus and zinc ions in SBF solution. The density, micro hardness and flexural strength of bioactive glasses and glass - ceramics were measured. Experimental results show that in vitro bioactivity nearly remains same by doping 1% of ZnO by weight, but after that as well as ZnO content increases in vitro bioactivity decreases. Crystallization of bioactive glasses decreases in vitro bioactivity. The density, micro hardness and flexural strength of bioactive glass - ceramics are higher than their respective bioactive glasses and these are also increasing with the increase of ZnO content.
Effect of Vertical Vibration on Block Foundation Resting on Homogeneous and Layered Medium
Ankesh Kumar, Dr. Bappaditya Manna, Prof. K. S. Rao
International Journal of Engineering Research , 2014,
Abstract: In the present study, an investigation is carried out to determine the effect of soil–rock and rock–rock foundation systems on dynamic response of block foundations under vertical mode of vibration. The half-space theory is used for the analysis of foundation resting on homogeneous soil and rocks. The finite element program having transmitting boundaries is considered for layered system considering soil–rock and rock–rock combinations. The analysis is carried out in details for soil– rock and weathered rock–rock systems and the different equations are presented for above combinations. The effect of top layer thicknesses, shear wave velocity and eccentric moments are also simulated. The rock–rock systems considered are sandstone, shale and limestone underlain by basalt rock. It is interpreted that as the shear wave velocity ratio increase the natural frequency increases and the peak displacement amplitude decreases.
Metabolic side effects of antipsychotic agents: a prospective study in a teaching hospital.
Ankesh Barnwal,Bhavit Oza,Varsha Patel
NHL Journal of Medical Sciences , 2012,
Abstract: Background: Antipsychotic drugs have propensity to produce side effects like extrapyramidal syndrome, hyperglycemia, lipid abnormalities and weight gain. As data from India related to this aspect are scarce, this study was carried out.Aims and Objectives: To study metabolic effects of antipsychotic drugs using biochemical parameters and to compare metabolic effects of different antipsychotic agents.Materials and methods: This was a prospective study of patients attending the psychiatry outpatient department from September 2007 to May 2008. Each patient enrolled was followed up for 12weeks or less till the antipsychotics were prescribed. Body weight,fasting blood glucose, fasting lipid profile were recorded at baseline and at subsequent visits.Results: Out of 45 patients, 33 completed the study. Bipolar disorder (31%) was the most frequent diagnosis followed by brief psychotic disorder (22%), schizophrenia (20%) and others.Olanzapine was the most frequently prescribed antipsychotic drug (56%) followed by risperidone (24%) and haloperidol (20%). 84% received single antipsychotic drug. After 12weeks of therapy all antipsychotics caused significant weight gain (p<0.001), olanzapine caused significant rise in fasting blood glucose (p<0.001) and serum cholesterol (p<0.001). All antipsychotics caused significant rise in serum triglyceride level (p<0.01) Conclusion: All antipsychotics can cause significant abnormalities in carbohydrate and lipid metabolism. Selection of antipsychotics, particularly the newer ones requires consideration of co morbidities like obesity, diabetes mellitus and dyslipidemias. During antipsychotic drug therapy periodic monitoring for metabolic abnormalities is advisable.
Nanotechnology, Big things from a Tiny World: a Review
Debnath Bhattacharyya,Shashank Singh,Niraj Satnalika,Ankesh Khandelwal
International Journal of u- and e- Service, Science and Technology , 2009,
Abstract: The purpose of this paper is to look into the present aspects of “Nanotechnology”. This paper gives a brief description of what Nanotechnology is?? And its application in various fields viz. computing, medicine, food technology, Robotics, Solar cells etc. It also deals with the future perspectives of Nanotechnology, risks in advanced nanotechnology.
The Use of Multi-Objective Genetic Algorithm Based Approach to Create Ensemble of ANN for Intrusion Detection  [PDF]
Gulshan Kumar, Krishan Kumar
International Journal of Intelligence Science (IJIS) , 2012, DOI: 10.4236/ijis.2012.224016
Abstract: Due to our increased dependence on Internet and growing number of intrusion incidents, building effective intrusion detection systems are essential for protecting Internet resources and yet it is a great challenge. In literature, many researchers utilized Artificial Neural Networks (ANN) in supervised learning based intrusion detection successfully. Here, ANN maps the network traffic into predefined classes i.e. normal or specific attack type based upon training from label dataset. However, for ANN-based IDS, detection rate (DR) and false positive rate (FPR) are still needed to be improved. In this study, we propose an ensemble approach, called MANNE, for ANN-based IDS that evolves ANNs by Multi Objective Genetic algorithm to solve the problem. It helps IDS to achieve high DR, less FPR and in turn high intrusion detection capability. The procedure of MANNE is as follows: firstly, a Pareto front consisting of a set of non-dominated ANN solutions is created using MOGA, which formulates the base classifiers. Subsequently, based upon this pool of non-dominated ANN solutions as base classifiers, another Pareto front consisting of a set of non-dominated ensembles is created which exhibits classification tradeoffs. Finally, prediction aggregation is done to get final ensemble prediction from predictions of base classifiers. Experimental results on the KDD CUP 1999 dataset show that our proposed ensemble approach, MANNE, outperforms ANN trained by Back Propagation and its ensembles using bagging & boosting methods in terms of defined performance metrics. We also compared our approach with other well-known methods such as decision tree and its ensembles using bagging & boosting methods.
Equilibrium Positions of a Cable-Connected Satellites System under Several Influences  [PDF]
Santosh Kumar, Sangam Kumar
International Journal of Astronomy and Astrophysics (IJAA) , 2016, DOI: 10.4236/ijaa.2016.63024
Abstract: The present paper deals with the study of equilibrium positions of the motion of a system of two artificial satellites connected by a light, flexible, inextensible and non-conducting cable under the influence of solar radiation pressure, earth’s oblateness, shadow of the earth and air resistance. Here, we study the case of circular orbit of the centre of mass of the system. We derive differential equations of motion of the system. General solutions of the differential equations are beyond the reach. On the other hand, the general solutions do not serve our purpose. Jacobian integral of the system has also been obtained. Thereafter equilibrium positions of the motion of the system have been obtained.
On the Design of Circular Fractal Antenna with U-Shape Slot in CPW-Feed  [PDF]
Raj Kumar
Wireless Engineering and Technology (WET) , 2010, DOI: 10.4236/wet.2010.12012
Abstract: A new ultawideband circular fractal antenna with notched-band characteristics is presented. A notched-band characteristic is achieved by employing a U-shape slot in 50 Ω feed lines. The ultra-wideband impedance matching and compact size have been obtained by using CPW-feed technique and the fractal concept. The measured result of proposed fractal antenna exhibits the ultra wideband characteristics from 3.0 to 18.0 GHz at VSWR 2:1 except notched-band frequency. The proposed antenna has been analyzed theoretically and experimentally with respect to design parameters. The measured radiation pattern of fractal antenna is nearly omnidirectional in azimuth plane throughout the operating frequency. This antenna is useful for UBW communication system.
Object-Oriented Finite Element Analysis of Metal Working Processes  [PDF]
Surendra Kumar
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.36066
Abstract: Recently an object-oriented approach has been applied in the fields of finite element analysis with a view to treating the various complexities within these. It has been demonstrated that finite element software designed using an object-oriented approach can be significantly more robust than traditional codes. This paper describes a special kind of implementation of object-oriented programming which is rather hybrid in nature, in the development of a finite element code for engineering analysis of metal working problems using C++, and discusses the advantages of this approach.
Reactive Power and FACTS Cost Models’ Impact on Nodal Pricing in Hybrid Electricity Markets  [PDF]
Ashwani Kumar
Smart Grid and Renewable Energy (SGRE) , 2011, DOI: 10.4236/sgre.2011.23026
Abstract: In a competitive environment reactive power management is an essential service provided by independent system operator taking into account the voltage security and transmission losses. The system operator adopts a transparent and non-dis-criminatory procedure to procure the reactive power supply for optimal deployment in the system. Since generators’ are the main source of reactive power generation and the cost of the reactive power should be considered for their noticeable impact on both real and reactive power marginal prices. In this paper, a method based on marginal cost theory is presented for locational marginal prices calculation for real and reactive power considering different reactive power cost models of generators’ reactive support. With the presence of FACTS controllers in the system for more flexible operation, their impact on nodal prices can not be ignored for wheeling cost determination and has also to be considered taking their cost function into account. The results have been obtained for hybrid electricity market model and results have also been computed for pool model for comparison. Mixed Integer Non-linear programming (MINLP) approach has been formulated for solving the complex problem with MATLAB and GAMS interfacing. The proposed approach has been tested on IEEE 24-bus Reliability Test System (RTS).
Mental health services in rural India: challenges and prospects  [PDF]
Anant Kumar
Health (Health) , 2011, DOI: 10.4236/health.2011.312126
Abstract: Mental health services in India are neglected area which needs immediate attention from the government, policymakers, and civil society organizations. Despite, National Mental Health Programme since 1982 and National Rural Health Mission, there has been a very little effort so far to provide mental health services in rural areas. With increase in population, changing life-style, unemployment, lack of social support and increasing insecurity, it is predicted that there would be a substantial increase in the number of people suffering from mental illness in rural areas. Considering the mental health needs of the rural community and the treatment gap, the paper is an attempt to remind and advocate for rural mental health services and suggest a model to reduce the treatment gap.
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