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Search Results: 1 - 10 of 198285 matches for " Vaibhav N. Keskar "
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An Automation Tool for Single-node and Multi-node Hadoop Cluster
Vaibhav N. Keskar,Amit A. Kathade,Gopal S. Sarda,Amit D. Joshi
Journal of Artificial Intelligence , 2013,
Abstract: Many organisations are required to deal with large data sets. To handle the large data sets these organisations use hadoop cluster. But they need to set up hadoop cluster with different number of nodes several times. This is very common case for many organisations that have just started with hadoop cluster. Setting up hadoop cluster is not a difficult job but requires large human efforts and time. As the number of nodes increases, human efforts and time required also increase. An automation tool which will automate the hadoop cluster set up procedure will be the possible solution to reduce human efforts and time requirement. This study talks about the tool which will automate the hadoop cluster set up procedure. No tool had proved a single operator to install single-node and multi-node cluster.
One Clock-Cycle Response 0.5 m CMOS Dual-Mode DC-DC Bypass Boost Converter Stable over Wide Variations
Neeraj A. Keskar,Gabriel A. Rincón-Mora
Advances in Power Electronics , 2010, DOI: 10.1155/2010/253508
Abstract: Power supplies in portable applications must not only conform and adapt to their highly integrated on-chip and in-package environments but also, more intrinsically, respond quickly to fast load dumps to achieve and maintain high accuracy. The frequency-compensation network, however, limits speed and regulation performance because it must cater to all combinations of filter capacitor , inductor L, and 's equivalent series resistance resulting from tolerance and modal design targets. As such, it must compensate the worst-case condition and therefore restrain the performance of all other possible scenarios, even if the likelihood of occurrence of the latter is considerably high and the former substantially low. Sigma-delta ( ) control, which addresses this issue in buck converters by easing its compensation requirements and offering one-cycle transient response, has not been able to simultaneously achieve high bandwidth, high accuracy, and wide compliance in boost converters. This paper presents a dual-mode boost bypass converter, which by using a high-bandwidth bypass path only during transient load-dump events was experimentally 1.41 to 6 times faster than the state of the art in current-mode boost supplies, and this without any compromise in compliance range (0–50?m , 1–30? H, and 1–350? F). 1. Introduction In portable applications like cellular phones, PDAs, and the like, integrated BiCMOS and CMOS switching dc-dc supply circuits reduce cost, size, component count, and design complexity (from a user’s perspective). One of the critical bottlenecks in obtaining a fully integrated solution, however, is the frequency-compensation circuit, which is designed around off-chip power LC filter devices to obtain optimal performance [1]. The fact is mode-rich state-of-the-art applications, manufacturing tolerances, and parameter drifts expose dc-dc converter integrated circuits (ICs) to wide variations in output capacitance CO, power inductance L, and CO’s equivalent series resistance , inducing considerable changes in loop-gain and transient response, compromising feedback stability or transient response. As a result, to guarantee stability and high bandwidth with a fixed on-chip frequency-compensation circuit, the design necessarily constrains LC values within a narrow target range [1]. This is especially detrimental in compact high-performance multiple input-output converters [2, 3], where the on-chip or in-package LC filter is variable by design to dynamically accommodate the diverse loading conditions of the system. Unclocked or asynchronous sigma-delta ( )
Lymphangiogenesis as a Prognostic Marker in Breast Cancer Using D2-40 as Lymphatic Endothelial Marker—A Preliminary Study  [PDF]
Mumtaz A. Ansari, Vaibhav Pandey, Vivek Srivastava, Mohan Kumar, R. N. Mishra, Anand Kumar
Journal of Cancer Therapy (JCT) , 2012, DOI: 10.4236/jct.2012.325103
Abstract: We studied tumour lymphangiogenesis and lymphatic invasion using D2-40 endothelial marker in 35 breast cancer patients treated by primary surgery and correlated it with various clinico-pathological prognostic parameters. Lymphangiogenesis was quantified using lymphatic micro vessel density (LMVD) by counting the immunostained lymphatic microvessels at 200X. The mean age was 45.97±12.09 years (range 30-80 years). LMVD ranged from 5/hpf to 56/hpf with a mean score of 13.4±10.8 and median of 9. The median value of 9 was taken to classify patients into a low or high LMVD. LMVD correlated significantly with tumour size (p=0.003), histological grade (p=0.046), lymph node status (p=0.030). There was no significant correlation of LMVD with stage, estrogen receptor, progesterone receptor or HER2/neu immunoreactivity. Lymphovascular invasion on D2-40 staining [LVI-D40] was found in 13 (37.1%) cases compared to 6 cases (17.1%) on H & E staining showing a poor agreement (k=0.244). LVI correlated significantly with lymph node status (p=0.011). There was a strong association between tumour size (p=0.142), histological grade (p=0.066) though the correlation was not statistically significant. No correlation was found with stage, estrogen receptor, progesterone receptor or HER2/neu immunoreactivity. The mean LMVD in LVI positive patients was higher (22.85±13.29) as compared to LVI negative patients (7.95±2.05) and this was statistically significant (p=0.001). Increased D2-40 detected LMVD and LVI correlated with poor prognostic parameters.
REVIEW: USE of COMPOSITE ADSORBENTS in ADSORPTION REFRIGERATION
Vaibhav N. Deshmukh,Satishchandra V. Joshi
International Journal of Innovative Technology and Creative Engineering , 2012,
Abstract: The urbanization across the world has resulted in increased demand for refrigeration and air conditioning. The main disadvantage with the conventional method i.e. vapor compression system is environment pollution. Another problem faced during urbanization is energy crisis. The adsorption refrigeration system is one of the solutions to this problem. The advantages of this system are environment friendly, less noise, use of waste heat or solar energy. But the disadvantage with adsorption system is low coefficient of performance (COP) and bulkiness. Researchers across the world are working on this issue to make adsorption system a viable alternative to the compression systems. Since the last two decades considerable work is being done on the use of composite adsorbents to improve the heat and mass transfer performance. This kind of adsorbent is usually obtained by the combination of a chemical adsorbents and physical adsorbents.
Synthesis, spectral, thermal and biological studies of transition metal complexes of 4-hydroxy-3-[3-(4-hydroxyphenyl)-acryloyl]-6-methyl-2H-pyran-2-one
VAIBHAV N. PATANGE,BALASAHEB R. ARBAD
Journal of the Serbian Chemical Society , 2011,
Abstract: The solid complexes of Mn(II), Fe(III), Co(II), Ni(II), and Cu(II) with 4-hydroxy-3-[(2E)-3-(4-hydroxyphenyl)prop-2-enoyl]-6-methyl-2H-pyran-2-one, derived from 3-acetyl-6-methyl-2H-pyran-2,4(3H)-dione (dehydroacetic acid) and 4-hydroxybenzaldehyde, were synthesized and characterized by elemental analysis, conductometry, thermal analysis, magnetic measurements, IR, 1H-NMR and UV–Vis spectroscopy and a biological study. From the analytical and spectral data, the stoichiometry of the complexes was found to be 1:2 (metal:ligand). The physico–chemical data suggest a distorted octahedral geometry for the Cu(II) complexes and an octahedral geometry for all the other complexes. The thermal decomposition of all the complexes was studied by the TG–DTA method. The synthesized ligand and its metal complexes were screened for their in vitro antibacterial activity against Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacterial strains and for in vitro antifungal activity against Aspergillus flavus, Curvularia lunata and Penicillium notatum. The results of these studies showed the metal complexes to be more antibacterial/antifungal against one or more species as compared with the non-complexed ligand.
Tripod sign
Suvarna J,Keskar V
Journal of Postgraduate Medicine , 2009,
Abstract: "Tripod Sign" or "Amoss′s Sign" is a sign of meningeal irritation. Although useful in diagnosing meningitis, it is not pathognomic and may be seen in a variety of clinical conditions. Infants < 1 year of age and immunocompromised individuals may not demonstrate signs of meningeal irritation. Since elicitation of the sign requires voluntary sitting up, it is of limited use in patients with marked altered sensorium and young infants.
A convenient and efficient protocol for the one pot synthesis of 3,4-Dihydropyrimidin-2-(1H)-ones catalyzed by ionic liquids under ultrasound irradiation
Dadhania, Abhishek N;Patel, Vaibhav K;Raval, Dipak K;
Journal of the Brazilian Chemical Society , 2011, DOI: 10.1590/S0103-50532011000300014
Abstract: derivatives of 3,4-dihydropyrimidin-2-(1h)-ones were synthesized in excellent yields in short reaction time by one pot, three component reaction of aldehydes, ethyl acetoacetate and urea (or thiourea) in room temperature ionic liquids (rtils) under ultrasound irradiation without any added catalyst. a plausible mechanistic pathway has been postulated based on the catalytic role of the ionic liquid in promoting the reaction. the ionic liquids could be recycled at least six times with retention of their activity
Neurally Derived Tissues in Xenopus laevis Embryos Exhibit a Consistent Bioelectrical Left-Right Asymmetry
Vaibhav P. Pai,Laura N. Vandenberg,Douglas Blackiston,Michael Levin
Stem Cells International , 2012, DOI: 10.1155/2012/353491
Abstract:
Transphyseal spread of benign tumors and infections in pediatric patients: A series of six cases
Bagaria Vaibhav,Harshvardhna N,Desai M,Sonowane S
Indian Journal of Medical Sciences , 2005,
Abstract: Epiphyseal extension of benign pathology is regarded as an infrequent occurrence. This observation has been attributed to anatomical and biochemical phenomenon unique to physeal cartilage. We report a retrospective series of six patients over a period of 4 years, diagnosed with benign pathologies that showed crossing of an open physeal plate by the disease. Four of these cases were infections and two were benign tumors. The patients were aged between 5 and 11 years, all of them were treated at a tertiary referral centre and followed up for a minimum period of 6 months to evaluate the progress of disease. The findings are more than just a pathological curiosity as they alter the management and surgical procedure that needs to be performed for these conditions. The recognition of the fact that benign tumors may occasionally present with transphyseal spread will prevent unjustified radical procedures that are best reserved for aggressive malignant conditions.
Transition metal complexes with oxygen donor ligands: a synthesis, spectral, thermal and antimicrobial study
VAIBHAV N. PATANGE,RAJENDRA K. PARDESHI,BALASAHEB R. ARBAD
Journal of the Serbian Chemical Society , 2008,
Abstract: Transition metal complexes of chalcones derived from the conden sation of 3-acetyl-6-methyl-2H-pyran-2,4(3H)-dione (dehydroacetic acid) and p-methoxybenzaldehyde (HL1) or p-nitrobenzaldehyde (HL2) were synthesized and characterized by elemental analysis, conductometry, thermal analysis, magnetic measurements, IR, 1H-NMR, UV–Vis spectroscopy and a microbial study. From the analytical and thermal data, the stoichiometry of the complexes was found to be 1:2 (metal:ligand). The molar conductance data revealed that all the metal chelates were non-electrolytes. The thermal stability of the complexes was studied by thermogravimetry and the decomposition schemes of the complexes are given. The ligands and their metal complexes were screened for antibacterial activity against Staphylococcus aureus and Escherichia coli, and fungicidal activity against Aspergillus flavus, Curvularia lunata and Penicillium notatum.
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