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Search Results: 1 - 10 of 555013 matches for " A. K. Tyagi "
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Seamless Handoff through Information Retrieval in VANET Using Mobile Agent
Himanshu Tyagi,A K Vatsa
International Journal of Computer Science Issues , 2011,
Abstract: Nowadays, everything is moving towards the infrastructure less wireless environment to bring the smartness of the society. In this situation, it is necessary to bring the smart technologies in the adhoc network environment. As vehicular traffic is a foremost problem in modern cities and on highway. Huge amount of time and resources are wasted while traveling due to traffic congestion. VANET is providing comfort and safety for passengers. Moreover, various transactions like information on accident, road condition, petrol bank details, menu in the restaurant, and discount sales can be provided to the drivers and passengers. The speed and time in which the message is sent and received plays an essential part in the Intelligent Transport System (ITS). For this the VANET requires efficient and reliable methods for data communication, gathering and retrieving information for seamless handoff in VANET. In this paper we discusses the architecture of VANET consists clusters that's designed by mobile agents having instantaneous conditions of Mobile Nodes available in VANET. For efficient data communication, an attempt has been made to create a new clustering concept with the help of mobile agents among the VANET nodes. Subsequently for smooth and seamless handoff we have considered the call admission control mechanism with the help of Genetic algorithms applied over information retrieval system managed by mobile agent with the effect of shadowing for reducing the data overhead over VANET.
In vivo embryo production in buffalo: present and perspectives
A. K. Misra,S. Tyagi
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2007.s2.74
Abstract: Buffaloes constitute a significant part of the domestic stock and contribute very significantly in the rural economy, especially in South and South-East Asia. Embryo transfer technique (ETT), a proven tool for faster multiplication of desired genetic resource has been satisfactorily used for cattle and is being adopted for buffalo. Following very limited research in buffalo, the viable embryo production has increased significantly from less than 1 per flushing to 2.5-3.0 in general and over 4 in isolated cases and conception rate following embryo transfer improved from about 10% to about 30-40%. However, response to superovulatory treatments and recovery of viable embryos following superovulation is still low compared to cattle due to various factors. This paper deals with the present success rate and information on some of the factors affecting in vivo embryo production, and future possibilities to make this technique more efficient and economic for wider use, in buffalo.
Variation in Parameters of Ambient Air Quality in National Capital Territory (NCT) of Delhi (India)  [PDF]
Anunay A. Gour, Santosh K. Singh, Sushil K. Tyagi, Anubha Mandal
Atmospheric and Climate Sciences (ACS) , 2015, DOI: 10.4236/acs.2015.51002

Air Pollution is an escalating problem worldwide fuelled by increasing anthropogenic activities, speedy development, rapid industrialization, transportation, superfluous use of fossil fuel consumption, increasing global power needs, etc. Also the diverse meteorological factors influence our environment to a great extent. Population explosion has led to remarkable increase in vehicular population. The use solely depends upon the lifestyle of the citizen. Any change in the lifestyle has a remarkable effect on the air we breathe. A comprehensive database for pollution levels from the year 2006 to 2010 was analyzed for a main traffic intersection and a non-traffic area in Delhi (India). The paper asserts that pollutant concentration levels on weekend are lower than those on weekdays (increase on Sundays with respect to weekdays is CO 2.98 times, PM2.5 1.18 times, NO 1.62 times, NO2 5.76 times, SO2 1.27 times and O3 1.15 times). The pollution levels have been found to attenuate on public holidays and weekends. Pollution can hence be related to the weekly cycle of human activities. Pollutions due to vehicular emissions on roads, rails, air or water all serve as major sources of pollution. Hence, viably possible solutions for pollution control can also be achieved by controlling the magnitude of traffic flow on roads.

Prediction of Users Behavior through Correlation Rules
Navin Kumar Tyagi,A. K. Solanki
International Journal of Advanced Computer Sciences and Applications , 2011,
Abstract: Web usage mining is an application of Web mining which focus on the extraction of useful information from usage data of severs logs. In order to improve the usability of a Web site so that users can more easily find and retrieve information they are looking for, we proposed a recommendation methodology based on correlation rules. A correlation rule is measured not only by its support and confidence but also by the correlation between itemsets. Proposed methodology recommends interesting Web pages to the users on the basis of their behavior discovered from web log data. Association rules are generated using FP growth approach and we used two criteria for selecting interesting rules: Confidence and Cosine measure. We also proposed an algorithm for the recommendation process.
Mass spectral analysis and quantification of Secondary Ion Mass Spectrometry data
A. K. Balamurugan,S. Dash,A. K. Tyagi
Physics , 2014, DOI: 10.1016/j.ijms.2015.06.004
Abstract: This work highlights the possibility of improving the quantification aspect of Cs-complex ions in SIMS (Secondary Ion Mass Spectrometry), by combining the intensities of all possible Cs-complexes. Identification of all possible Cs-complexes requires quantitative analysis of mass spectrum from the material of interest. The important steps of this mass spectral analysis include constructing fingerprint mass spectra of the constituent species from the table of isotopic abundances of elements, constructing the system(s) of linear equations to get the intensities of those species, solving them, evaluating the solutions and employing a regularization process when required. These steps are comprehensively described and the results of their application on a SIMS mass spectrum obtained from D9 steel are presented. It is demonstrated that results from the summation procedure, which covers entire range of sputtered clusters, is superior to results from single Cs-complex per element. The result of employing a regularization process in solving a mass spectrum from an SS316LN steel specimen is provided to demonstrate the necessity of regularization.
Growth Kinetics of Ion Beam Sputtered Al-thin films by Dynamic Scaling Theory
Neha Sharma,K. Prabakar,S. Dash,A. K. Tyagi
Physics , 2014, DOI: 10.1016/j.tsf.2014.10.094
Abstract: This paper reports the study of growth kinetics of ion beam sputtered aluminum thin films. Dynamic scaling theory was used to derive the kinetics from AFM measurements. AFM imaging revealed that surface incorporates distinctly different morphologies. Variation in deposition times resulted in such distinctiveness. The growth governing static (alpha) as well as dynamic (beta) scaling exponents have been determined. The exponent (alpha) decreased as the deposition time increased from 3 to 15 minutes. Consequently, the interfacial width (xi) also decreased with critical length (Lc), accompanied with an increase in surface roughness. Surface diffusion becomes a major surface roughening phenomenon that occurs during deposition carried out over a short period of 3 minutes. Extension of deposition time to 15 minutes brought in bulk diffusion process to dominate which eventually led to smoothening of a continuous film.
Analysis on Binding Energy and Auger Parameter for Estimating Size and Stoichiometry of ZnO Nanorods
Santanu Bera,Sandip Dhara,S. Velmurugan,A. K. Tyagi
International Journal of Spectroscopy , 2012, DOI: 10.1155/2012/371092
Abstract: ZnO nanorods prepared through chemical vapor deposition technique are characterized by microscopic and X-ray photoelectron spectroscopy (XPS) techniques to correlate the effects of size on the binding energy of Zn 2p3/2 photoelectrons. A positive shift in Zn 2p3/2-binding energy as compared to that in bulk ZnO is assumed to be the effect of size of ZnO tips. The shift in binding energy has been explained in terms of relaxation energy in the photoemission process. Simultaneously, Auger parameter of the nanorods is evaluated for stoichiometric composition. The extra peak in O1s spectrum of nanorods is explained as adsorbed O-bearing species or surface contaminants. 1. Introduction One-dimensional (1-D) nanostructures of semiconducting materials have received much attention in recent years, with the expectation that they can be applied to short-wavelength optical devices and excitonic devices operating at room temperature. In particular, the exciton-binding energies in GaN and ZnO are reported so large that they can be applied to laser devices based on excitonic processes. In fact, exciton-related stimulated emission and optically pumped laser action in GaN and ZnO nanostructures have been observed at room temperature [1, 2]. Its high band gap energy of 3.37?eV at room temperature [3] and free-exciton binding energy (60?meV) [2] which is much larger than that of GaN (~25?meV) [1] along with its larger absorption coefficient compared to GaN make ZnO a potential candidate for optoelectronics applications. A detailed photoluminescence (PL) study at low temperature with assignments of excitonic peaks and associated longitudinal optical (LO) phonon replicas along with donor-pair-acceptor transitions has been reported for ZnO single crystalline sample [4]. Looking at the importance in the understanding of electronic properties for the ultimate optoelectronic applications, a study on the effect of size dispersion on electronic properties will be extremely important. We report here the photoelectron spectroscopic studies of stoichiometric ZnO nanorods (NRs), grown by catalyst-free chemical vapor deposition (CVD) technique, with sharp facets. Role of size in these nanostructure on the binding energy of photoelectrons is studied in the light of final state effects of the photoemission process. 2. Experimental Details ZnO NRs were grown on p++-Si (~0.001?Ohm-cm) substrate in the flow of N2/O2 (500?sccm) at 130–140°C by CVD technique using metalorganic precursor of zinc bisacetylacetonate hydrate [Zn(AA)2·xH2O; Zn(C5H7O2)2·xH2O] [5]. The morphology of the NRs was
Environmental Influence and Health Status of Elderly
Renu Tyagi, Satwanti Kapoor and A.K. Kapoor
The Open Anthropology Journal , 2008, DOI: 10.2174/1874912700801010014]
Abstract: The study was conducted in order to explore and compare the health status of the elderly living in two different environmental setups. Height, weight, heart rate and blood pressure were measured in 259 subjects ranging from 60-85 years. This process includes 120 elderly from old age homes and 139 elderly living with their families. Body mass index was calculated statistically. Nutritional status was assessed using the BMI guidelines of WHO. Significant differences were found in weight, heart rate, blood pressure and BMI between most of the age groups of old age homes and females living with families. Percentage of overweight/obesity was found to be relatively higher among females living with families as compared to those living in old age homes. The blood pressure showed positive and significant association [p<0.01] with the BMI. The cardiovascular functions [p<0.001] and nutritional status [p<0.05] were found to be significantly influenced by the environmental set up.
Removal of Interferences from Partial Discharge Pulses using Wavelet Transform
Vidya H.A,Bindia Tyagi,V Krishnan,K. Mallikarjunappa
Abstract: It is essential to detect partial discharge (PD) as a symptom of insulation breakdown in high voltage (HV) applications. However accuracy of such measurement is often degraded due to the existence of noise in the signal. Wavelet Transform (WT) seems to be more suitable than traditional Fourier Transform in analyzing signals with interesting transient information such as partial discharge (PD) signals. In this paper a WT method with soft thresholding is used for signal denoising. PD signals and corona obtained from actual measurements with different voltage magnitudes are processed. Processed signals show the better result.
Lymphoid pseudotumours or pseudolymphomas of the orbit
Gogi R,Nath K,Khan A,Tyagi S
Indian Journal of Ophthalmology , 1976,
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