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Search Results: 1 - 10 of 198068 matches for " N. Vinothkumar "
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High Performance and Fault Tolerance Double Precision Floating Point Arithmetic Units
N. Vinothkumar,M.S. Ravi,Kittur Harish Maillikarju
Journal of Artificial Intelligence , 2013,
Abstract: The floating point arithmetic units are complex in their algorithms and many scientific problems require floating point units with high accuracy. Hence for increased performance and fault tolerance operations the double precision floating point arithmetic units adder, subtractor, multiplier and divider is designed which is enough for most System on Chip (SoC) applications and it also improves the accuracy during long chain of computations. The synthesized code results are verified and the complete layout is generated using backend flow.
Magnetic Bearing
Anbuselvan. T,Vinothkumar. K,Sai Vikash. M
International Journal on Theoretical and Applied Research in Mechanical Engineering , 2013,
Abstract: The use of bearings is essential to all types of machines, especially in marine aspects they provide the function of supporting heavier component in a desired position. These bearings have contact with the rotating part and causes surface wear which can be controlled by lubrication. Researches have raised the standards of performance for rotating equipment by providing robust, cost effective, easy to implement magnetic bearing solutions. Use of magnetic bearings in ships can be more advantageous because it is contact –free resulting in no surface wear and hence no need for lubricant, no servicing and can work in clean environment. It has several other benefits like high reliability, clean environments, high speed applications, position and vibration control and can withstand in extreme conditions. Magnetic bearing will also restrict the translational sliding, which is merely a linear case of supporting a rotating object thus use of thrust block also eliminated. Magnetic bearing technology has become viable because of advances in micro-processing controllers that allows for confident and robust active control. This paper discusses more about the construction, principle and working of magnetic bearing in detail.
Fault Diagnosis in H-Bridge Multilevel Inverter Drive Using Wavelet Transforms
International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering , 2013,
Abstract: Induction motors are normally used in the industrial environments. Industry has begun to use energy efficient high power rating electrical drives. Multilevel inverter drives have become a solution for energy efficient drives in recent years. There may beprobability for occurring of many faults in the multi-level inverter fed induction motor drive due to its complex switching patterns. So it is necessary to identify types of fault and its location in order to improve the reliability of the drives. In this paper presents a new fault diagnosis technique based on discrete wavelet transforms for H-bridge multilevel inverter drives. For demonstrating the proposed method one H-Bridge open circuit fault are considered in the H-Bridge multilevel inverter. The 30V prototype system is developed and controlled by Renesas processor. LabVIEW based data acquisition system is used to acquire the real time inverter output voltage and current. The experimental results are shown to illustrate the effectiveness of the proposed method.
A Real World Experience of Guidewire-Induced Perforations during Percutaneous Intervention and Their Successful Management  [PDF]
Sridhar Kasturi, Vinothkumar Vilvanathan, Srinivas Polasa, Shiva Kumar Bandimida, Kripa Patel, Ashok Thakkar
International Journal of Clinical Medicine (IJCM) , 2014, DOI: 10.4236/ijcm.2014.58066
Abstract: Complication rates following percutaneous interventions have decreased over the past decade due to advancement in both interventional equipment and procedure technique. Despite these advances, the risk of iatrogenic perforations still exists with associated high morbidity and mortality. We are presenting three cases of guidewire-induced perforations including coronary artery and renal artery perforation with their complications and successful management in these case-series.
Thon rings from amorphous ice and implications of beam-induced Brownian motion in single particle electron cryo-microscopy
G. McMullan,K. R. Vinothkumar,R. Henderson
Physics , 2015, DOI: 10.1016/j.ultramic.2015.05.017
Abstract: We have recorded dose-fractionated electron cryo-microscope images of thin films of pure flash-frozen amorphous ice and pre-irradiated amorphous carbon on a Falcon~II direct electron detector using 300 keV electrons. We observe Thon rings \cite{Thon1966} in both the power spectrum of the summed frames and the sum of power spectra from the individual frames. The Thon rings from amorphous carbon images are always more visible in the power spectrum of the summed frames whereas those of amorphous ice are more visible in the sum of power spectra from the individual frames. This difference indicates that while pre-irradiated carbon behaves like a solid during the exposure, amorphous ice behaves like a fluid with the individual water molecules undergoing beam-induced motion. Using the measured variation in the power spectra amplitude with number of electrons per image we deduce that water molecules are randomly displaced by mean squared distance of $\sim$ 1.1 \AA$^{2}$ for every incident 300 keV e$^{-}$/\AA$^2$. The induced motion leads to an optimal exposure with 300 keV electrons of 4.0 e$^{-}$/\AA$^2$ per image with which to see Thon rings centred around the strong 3.7{\AA} scattering peak from amorphous ice. The beam-induced movement of the water molecules generates pseudo-Brownian motion of embedded macromolecules. The resulting blurring of single particle images contributes an additional term, on top of that from radiation damage, to the minimum achievable B-factor for macromolecular structure determination.
Callus regeneration from stem explants of Pseudarthira viscidplanta (L.) Wight and Arn. – a vulnerable medicinal
D Vinothkumar, S Britto, J Sebastinraj, J Robinson, S Senthilkumar
African Journal of Biotechnology , 2009,
Abstract: An in vitro propagation protocol has been developed for Pseudarthira viscida (L.) Wight and Arn. (Papilionaideae), a vulnerable medicinal plant from stem callus was used for axillary shoot multiplication. The plant was standardized by using MS (Murashige and Skoog) medium containing 3% (w/v) sucrose, supplemented with a cytokinin (BAP, KN) maximum number of shoot (29.87±5.34) were observed on the medium containing 0.6 mg/l BAP after three weeks of culture. Single shoots were induced and elongated on MS medium supplemented with BAP+NAA (0.4 + 0.04 mg/l). The elongated shoots were rooted in half MS medium with 0.4 mg/l IBA, and then were successfully hardened and transferred to the field.
Experimental Study on Various Solar Still Designs
T. Arunkumar,K. Vinothkumar,Amimul Ahsan,R. Jayaprakash
ISRN Renewable Energy , 2012, DOI: 10.5402/2012/569381
Experimental Study on Various Solar Still Designs
T. Arunkumar,K. Vinothkumar,Amimul Ahsan,R. Jayaprakash,Sanjay Kumar
ISRN Renewable Energy , 2012, DOI: 10.5402/2012/569381
Abstract: Humankind has depended for ages on underground water reservoirs for its fresh water needs. But these sources do not always prove to be useful due to the presence of excessive salinity in the water. In this paper, the fabrication of seven solar still designs such as spherical solar still, pyramid solar still, hemispherical solar still, double basin glass solar still, concentrator coupled single slope solar still, tubular solar still and tubular solar still coupled with pyramid solar still and their performance evaluation in converting brackish water into fresh water for drinking are presented. The experiment was constructed and tested during January to May 2011. All the solar stills were operated in the same climatic conditions to analyze the influence of the modifications on the productivity. From the observations, the compound parabolic concentrator-assisted tubular solar still shows the maximum yield. 1. Introduction Solar energy can be used either for seawater desalination by producing the thermal energy required to drive the phase change processes or by generating the electricity required to drive the membrane processes. Solar desalination systems are classified into direct and indirect collection systems. As their name imply, direct-collection systems use solar-energy to produce distillate directly in the solar collector, whereas in indirect collection systems, two sub-systems are employed. Conventional desalination systems are similar to solar systems because the same type of equipment is applied. The prime difference is that in the former, either a conventional boiler is used to provide the required heat or mains electricity is used to provide the required electric power, whereas in the latter, solar energy is applied [1]. Many papers have addressed solar stills of various configurations, including [2–6]. More specific studies include a hemispherical solar still [7, 8], pyramid solar still [9, 10], double-basin solar still [11–15], triple basin solar still [16], multiple basin solar still [17, 18], inverted absorber solar still [19–22], tubular solar stills [23–26], compound parabolic concentrator (CPC) solar still [27], weir-type cascade solar still [28, 29], wick-type [30], inverted absorber solar still [31], portable active solar still [32], integrated basin solar still with a sandy reservoir [33], titled wick-type with flat plate bottom reflector [34], fin [35], active vibratory solar still [36], and a plastic solar still [37]. In this paper, the fabrication and performance evaluation of seven solar still designs are presented. The ASTER GDEM
Automatic Bridge Control System
M. Niraimathi,S.Sivakumar,R.Vigneshwaran,R.Vinothkumar
International Journal of Electronics and Computer Science Engineering , 2012,
Abstract: Bridge vibration control is an important issue whose purpose is to extend the structural service life of bridges. Normally, the bridge is modeled as an elastic beam or plate subject to a moving vehicle. However, the moving truck on a bridge is a complicated problem that must still be researched. In this paper, wepropose a new method, to overcome the huge load in the bridge a load cell is used at the entry which will monitor the load continuously at both ends. To escape from the heavy water flow bridge vibrations alarm is used and it is connected with the water over flow sensor which will convert the heavy water flow signal into electrical signal and this electrical signal will make an alarm and close the gate of the bridge. When both the problem occurs at same time or at different time an alarm is generated and the bridges will automatically closed.
Reena A* Anitha M, Aysha OS, Valli S, Nirmala P, Vinothkumar P
International Journal of Bioassays , 2013,
Abstract: The in vitro studies on the antagonism of Trichoderma viride on pathogenic fungi, viz., Fusarium sp., Curvularia sp., Rhizopus sp., Aspergillus niger, A. flavus and A. fumigatus were carried out to test the ability of the antagonist fungi in inhibiting the growth of the experimental plant pathogens. The results of the activity assay of crude extracts of the antagonistic fungi Trichoderma viride at different concentrations on the radial mycelial growth and percent radial mycelial growth inhibition of different pathogenic fungi significantly varied among crude extract concentrations of the antagonist fungi and in between the plant pathogens. Further evaluation of Trichoderma bio-control potential in field condition was recommended.
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