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Search Results: 1 - 10 of 461837 matches for " A. Sivaranjani "
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Methods of Battery Charging with Buck Converter Using Soft-Switching Techniques
S. Abinaya,A. Sivaranjani,S. Suja
Bonfring International Journal of Power Systems and Integrated Circuits , 2011,
Abstract: This paper is a detailed study on methods of battery charging with Buck Resonant converter using soft switching techniques like ZVS and ZCS. This study also presents the circuit configuration with the least components to realize a highly efficient solar energy battery charger with a zero-voltage and zero current switching resonant converter. The high-frequency resonant converter has numerous well-known advantages over the traditional hard-switching converters. The most important advantage is that it offers a lower switching loss and a higher power density. Additionally, the soft switching current waveform characterizes a lower electromagnetic interference (EMI). The operating principles and design procedure of the proposed charger with both zero voltage and zero current are thoroughly analyzed. The optimal values of the resonant components are computed by applying the characteristic curve and electric functions derived from the circuit configuration. Finally, a simulation model is implemented for charger circuit designed for a 12-V 4-Ah lead acid battery using zero voltage and zero current switching and MATLAB/SIMULINK software is used as the simulation tool. The proposed dc?dc battery charger has a straightforward structure, low cost, easy control, and high efficiency. Satisfactory performance is obtained from the experimental results.
K. Sivaranjani,M. Meenakshisundaram
International Research Journal of Pharmacy , 2013,
Abstract: The aim of present investigation was to synthesis the nanoparticles by using the medicinal plant Ocimum basillicum. Biologically synthesized nanoparticles have been widely used in the field of therapeutic medicine. The silver nanoparticles were synthesized by using 1mM aqueous of silver nitrate with leaf extract of Ocimum basillicum. The growth of nanoparticles is monitored by visualizing color changes and it was confirmed by the techniques, UV-vis spectrophotometer and characterized by Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and X- ray diffraction (XRD) analysis. The result of varies techniques confirmed the presence of silver nanoparicles and showed the average particle size between 58-89nm. Further the synthesized nanoparticles are evaluated for its antimicrobial activity against on selected bacterial species.
Optimization of Thermal Aware VLSI Non-Slicing Floorplanning Using Hybrid Particle Swarm Optimization Algorithm-Harmony Search Algorithm  [PDF]
Sivaranjani Paramasivam, Senthilkumar Athappan, Eswari Devi Natrajan, Maheswaran Shanmugam
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.75048
Abstract: Floorplanning is a prominent area in the Very Large-Scale Integrated (VLSI) circuit design automation, because it influences the performance, size, yield and reliability of the VLSI chips. It is the process of estimating the positions and shapes of the modules. A high packing density, small feature size and high clock frequency make the Integrated Circuit (IC) to dissipate large amount of heat. So, in this paper, a methodology is presented to distribute the temperature of the module on the layout while simultaneously optimizing the total area and wirelength by using a hybrid Particle Swarm Optimization-Harmony Search (HPSOHS) algorithm. This hybrid algorithm employs diversification technique (PSO) to obtain global optima and intensification strategy (HS) to achieve the best solution at the local level and Modified Corner List algorithm (MCL) for floorplan representation. A thermal modelling tool called hotspot tool is integrated with the proposed algorithm to obtain the temperature at the block level. The proposed algorithm is illustrated using Microelectronics Centre of North Carolina (MCNC) benchmark circuits. The results obtained are compared with the solutions derived from other stochastic algorithms and the proposed algorithm provides better solution.
Monitoring the Turmeric Finger Disease and Growth Characteristics Using Sensor Based Embedded System —A Novel Method  [PDF]
Maheswaran Shanmugam, Asokan Ramasamy, Sivaranjani Paramasivam, Priyadharshini Prabhakaran
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.78112
Abstract: In this cyber era, novelty plays a prime role in the field of agriculture that majorly depends on computer-based measurements and control. Herein before, it was totally controlled and performed by the agriculturists. One of the technological innovative methods to measure and monitor the turmeric finger growth characteristics is the embedded system that is based on sensor array module such as flex sensor, temperature sensor and pH sensor. The experimental work has been designed and tested with five set of nodes and the growth of turmeric finger is tenuously monitored by measuring the change in flex resistance. Out of five nodes, two nodes were diseased. Deliberately, one node was left as such and the other node was treated with natural pesticides (pseudomonas and viride) to restrict the rhizome rot disease attack. After cultivation, it was found that the rhizome rot disease attack on the node which was treated with pesticides was comparatively lesser than the other node. The five different nodes have been used in the experimental work with an average flex sensor resistance of 3.962 cm/kΩ. In a nutshell, this proposed method manifests the farmers to detect the rhizome rot disease at its earlier stage and to prevent it as well by screening the growth of the turmeric fingers when it is under the soil.
International Research Journal of Pharmacy , 2012,
Abstract: The present documented the traditional knowledge of Medicinal Plants species used in various type of skin diseases in Nagapattinam district. We have documented the use of 50 species belonging to 26 families. The information on plants used as traditional medicine against skin diseases was gathered and ethnomedicinal survey based on interviews with local people involved in traditional herbal medicine practices. The particulars plants are used to cure variety of skin diseases, like swelling, wound healing, psoriasis, scabies, eczema, dandruff, tinea versicularis, tinea cruris, impetigo, skin parasities, leucoderma, leucoderma, leprosy, rash, etc. the studies carried out for the time in this area, the medicinal plants used by traditional users of N agapattinam district were arranged by botanical name, family, local name, habit, mode of preparation and uses.
Lyapunov Control of Quantum Systems with Applications to Quantum Computing
K. P. Nagarjun,S. Sivaranjani,George Koshy
Mathematics , 2012,
Abstract: In the design of complex quantum systems like ion traps for quantum computing, it is usually desired to stabilize a particular system state or make the system state track a desired trajectory. Several control theoretical approaches based on feedback seem attractive to solve such problems. But the uncertain dynamics introduced by measurement on quantum systems makes the synthesis of feedback control laws very complicated. Although we have not explicitly modeled the change in system dynamics due to measurement (we have assumed weak measurements), this is a first step towards a more detailed analysis and closed-loop feedback design. Here, we present a Lyapunov-based control approach on the lines of that developed by Mirrahimi, Rouchon, Turnici (2005). The states are assumed to be obtained from weak measurements. The Lyapunov control technique has not been applied to realistic quantum systems so far. We have extended and applied the technique to two realistic physical systems - the quantum harmonic oscillator and the n-qubit system. We also propose to extend this concept to ion traps.
Cell-Phone Use and Self-Reported Hypertension: National Health Interview Survey 2008
Sivaranjani Suresh,Charumathi Sabanayagam,Sita Kalidindi,Anoop Shankar
International Journal of Hypertension , 2011, DOI: 10.4061/2011/360415
Abstract: Background. Cell-phone usage has increased dramatically over the last decade, along with a rising public concern over the health effects of using this device. The association between cell-phone usage and hypertension has not been examined before. Methods. We analysed data from 21,135 adults aged ≥18 years who participated in the 2008 National Health Interview Survey. Based on reported cell-phone use, participants were categorized as cell-phone nonusers, predominantly landline users, dual users of cell phone and landline, and predominantly cell-phone users. The main outcome of interest was self-reported physician-diagnosed hypertension (=6,793). Results. 43.5% of the participants were cell-phone nonusers, while 13.8% were predominantly cell-phone users. We found that cell-phone use was inversely associated with hypertension, independent of age, sex, race/ethnicity, smoking, alcohol consumption, education, body mass index (BMI), and physical activity. Compared to cell-phone nonusers, the multivariable odds ratio (95% confidence interval) of hypertension was 0.86 (0.75–0.98, P trend  =  .005) among predominantly cell-phone users. This inverse association between cell-phone use and hypertension was stronger in women, those aged <60 years, whites, and those with BMI <25 kg/m2. Conclusion. We found that cell-phone usage was protectively associated with self-reported hypertension in a nationally representative sample of US adults.
Palakurthi Ashok Kumar,Vinta Bhanu Prakash Reddy,Sivaranjani Thiyaharajan
International Research Journal of Pharmacy , 2012,
Abstract: A simple and efficient NP-HPLC UVD method was developed and validated for the quantitative determination of Orlistat SSRR Impurity in Orlistat dosage forms. An isocratic separation was achieved by using a Chiral Pack IA, 250 mm × 4.6 mm, 5 μm particle size column with a flow rate of 1.0 ml/min and using a UV detector at 205 nm. The mobile phase consists of n-Hexane and Isopropyl alcohol (70:30, v/v). The drug was subjected oxidation, hydrolysis, photolysis and heat to apply stress conditions. Complete separation was achieved for the parent compound and SSRR Isomer of Orlistat in an overall analytical run time of approximately 45 min with the parent compound Orlistat eluting at approximately at 5 min. The method was linear over the concentration range of 3.1 - 40 μg/ml with a limit of detection and limit of quantification 1.0 μg/ml and 3.1μg/ml respectively. The method has been the requisite accuracy, selectivity, sensitivity and precision. Degradation products resulting from the stress studies did not interfere with the detection of Orlistat and SSRR Impurity and the test method is thus stability-indicating.
The Spread of Infectious Disease on Network Using Neutrosophic Algebraic Structure  [PDF]
A. Zubairu, A. A. Ibrahim
Open Journal of Discrete Mathematics (OJDM) , 2017, DOI: 10.4236/ojdm.2017.72009
Abstract: Network theory and its associated techniques has tremendous impact in various discipline and research, from computer, engineering, architecture, humanities, social science to system biology. However in recent years epidemiology can be said to utilizes these potentials of network theory more than any other discipline. Graph which has been considered as the processor in network theory has a close relationship with epidemiology that dated as far back as early 1900 [1]. This is because the earliest models of infectious disease transfer were in a form of compartment which defines a graph even though adequate knowledge of mathematical computation and mechanistic behavior is scarce. This paper introduces a new type of disease propagation on network utilizing the potentials of neutrosophic algebraic group structures and graph theory.
A Comparative Investigation of Lead Sulfate and Lead Oxide Sulfate Study of Morphology and Thermal Decomposition  [PDF]
S. A. A. Sajadi
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.22024
Abstract: The compound lead oxide sulfate PbSO4.PbO was prepared in our laboratory. The Thermal behavior of PbSO4 was studied using techniques of Thermogravimetry under air atmosphere from 25 to 1200°C. The identity of both compounds was confirmed by XRD technique. Results obtained using both techniques support same decomposition stages for this compound. The electron microscopic investigations are made by SEM and TEM. The compound is characterized by XRD and the purity was determined by analytical Methods. Also a series of thermogravimetric analysis is made and the ideal condition is determined to convert this compound to pure lead oxide.
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