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A Novel Boost PFC Converter Employing ZVS Based Compound Active Clamping Technique with EMI Filter
Mohan, P. Ram,Kumar, M. Vijaya,Reddy, O.V. Raghava The Institute of Electronics and Information Engin 2008 Journal of semiconductor technology and science Vol.8 No.1
A Boost Power Factor Correction (PFC) Converter employing Zero Voltage Switching (ZVS) based Compound Active Clamping (CAC) technique is presented in this paper. An Electro Magnetic Interference (EMI) Filer is connected at the line side of the proposed converter to suppress Electro Magnetic Interference. The proposed converter can effectively reduce the losses caused by diode reverse recovery. Both the main switch and the auxiliary switch can achieve soft switching i.e. ZVS under certain condition. The parasitic oscillation caused by the parasitic capacitance of the boost diode is eliminated. The voltage on the main switch, the auxiliary switch and the boost diode are clamped. The principle of operation, design and simulation results are presented here. A prototype of the proposed converter is built and tested for low input voltage i.e. 15V AC supply and the experimental results are obtained. The power factor at the line side of the converter and the converter efficiency are improved using the proposed technique.
A Novel Boost PFC Converter Employing ZVS Based Compound Active Clamping Technique with EMI Filter
P. Ram Mohan,M. Vijaya Kumar,O.V. Raghava Reddy 대한전자공학회 2008 Journal of semiconductor technology and science Vol.8 No.1
A Boost Power Factor Correction (PFC) Converter employing Zero Voltage Switching (ZVS) based Compound Active Clamping (CAC) technique is presented in this paper. An Electro Magnetic Interference (EMI) Filer is connected at the line side of the proposed converter to suppress Electro Magnetic Interference. The proposed converter can effectively reduce the losses caused by diode reverse recovery. Both the main switch and the auxiliary switch can achieve soft switching i.e. ZVS under certain condition. The parasitic oscillation caused by the parasitic capacitance of the boost diode is eliminated. The voltage on the main switch, the auxiliary switch and the boost diode are clamped. The principle of operation, design and simulation results are presented here. A prototype of the proposed converter is built and tested for low input voltage i.e. 15V AC supply and the experimental results are obtained. The power factor at the line side of the converter and the converter efficiency are improved using the proposed technique.
Ram Karan,Raj Kumar Mohan Singh,Sanjay Kapoor,S. K. Khare 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.2
Cloning and characterization of the gene encoding a solvent-tolerant protease from the haloalkaliphilic bacterium Geomicrobium sp. EMB2 are described. Primers designed based on the N-terminal amino acid sequence of the purified EMB2 protease helped in the amplification of a 1,505-bp open reading frame that had a coding potential of a 42.7-kDa polypeptide. The deduced EMB2 protein contained a 35.4-kDa mature protein of 311 residues, with a high proportion of acidic amino acid residues. Phylogenetic analysis placed the EMB2 gene close to a known serine protease from Bacillus clausii KSM-K16. Primary sequence analysis indicated a hydrophobic inclination of the protein; and the 3D structure modeling elucidated a relatively higher percentage of small (glycine, alanine, and valine) and borderline (serine and threonine) hydrophobic residues on its surface. The structure analysis also highlighted enrichment of acidic residues at the cost of basic residues. The study indicated that solvent and salt stabilities in Geomicrobium sp. protease may be accorded to different structural features; that is, the presence of a number of small hydrophobic amino acid residues on the surface and a higher content of acidic amino acid residues, respectively.
Chandra Mohan Sharma,Om Prakash Tiwari,Yashwant Singh Rana,Ram Krishan,Ashish Kumar Mishra 강원대학교 산림과학연구소 2016 Journal of Forest Science Vol.32 No.4
The present study was conducted on ridge tops of moist temperate Oak forests in Garhwal Himalaya to assess the plant diversity, regeneration, biomass production and carbon assimilation in different Oak forests. For this purpose, three Oak forest types viz., (a) Quercus leucotrichophora or Banj Oak (FT1; between 1,428-2,578 m asl), (b) Quercus floribunda or Moru Oak (FT2; between 2,430-2,697 m asl) and (c) Quercus semecarpifolia or Kharsu Oak (FT3; between 2,418-3,540 m asl) were selected on different ridge tops in Bhagirathi catchment area of Garhwal Himalaya. A total of 91 plant species including 23 trees (8 gymnosperms and 15 angiosperms), 21 shrubs and 47 herbs species belonging to 46 families were recorded from all the ridge top Oak forests. The highest mean tree density (607±33.60 trees ha-1) was observed in Q. floribunda forest with lower mean total basal cover (TBC) value (48.02± 3.67 m2ha-1), whereas highest TBC value (80.16±3.30 m2ha-1) was recorded for Q. semecarpifolia forest, with lowest mean stem density (594±23.43 stems ha-1). The total biomass density (TBD) across three Oak forests ranged between 497.32±83.70 (FT1) and 663.16±93.85 t ha-1 (FT3), while the total carbon density (TCD) values ranged between 228.75±22.27 (FT1) and 304.31±18.12 t ha-1 (FT3). Most of the tree species were found with good regeneration (GR) status (average 45%) in all the forest types whereas, few species were found not regenerating (NR) (average 17%) however, few new recruitments were also recorded. ANOVA (Post-Hoc Tukey’s test at 5% significance level) indicated significant forest-wise differences in TBC, TBD and TCD (in tree layer); family and evenness (in shrub layer only) values, while insignificant differences were noticed in density values of tree, seedling and herb layer.
Penem Mohan Krishna,Ram Prakash Sharma,Naramgari Sandeep 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.8
The boundary layer of a two-dimensional forced convective flow along a persistent moving horizontalneedle in an electrically conducting magnetohydrodynamic dissipative nanofluid was numericallyinvestigated. The energy equation was constructed with Joule heating, viscous dissipation, uneven heatsource/sink, and thermal radiation effects. We analyzed the boundary layer behavior of a continuouslymoving needle in Blasius (moving fluid) and Sakiadis (quiescent fluid) flows. We considered Cu nanoparticlesembedded in methanol. The reduced system of governing Partial differential equations (PDEs)was solved by employing the Rungee-Kutta-based shooting process. Computational outcomes of the rateof heat transfer and friction factors were tabulated and discussed. Velocity and temperature descriptionswere examined with the assistance of graphical illustrations. Increasing the needle size did not have asignificant influence on the Blasius flow. The heat transfer rate in the Sakiadis flow was high comparedwith that in the Blasius flow.
Sharma, Chandra Mohan,Tiwari, Om Prakash,Rana, Yashwant Singh,Krishan, Ram,Mishra, Ashish Kumar Institute of Forest Science 2016 Journal of Forest Science Vol.32 No.4
The present study was conducted on ridge tops of moist temperate Oak forests in Garhwal Himalaya to assess the plant diversity, regeneration, biomass production and carbon assimilation in different Oak forests. For this purpose, three Oak forest types viz., (a) Quercus leucotrichophora or Banj Oak (FT1; between 1,428-2,578 m asl), (b) Quercus floribunda or Moru Oak (FT2; between 2,430-2,697 m asl) and (c) Quercus semecarpifolia or Kharsu Oak (FT3; between 2,418-3,540 m asl) were selected on different ridge tops in Bhagirathi catchment area of Garhwal Himalaya. A total of 91 plant species including 23 trees (8 gymnosperms and 15 angiosperms), 21 shrubs and 47 herbs species belonging to 46 families were recorded from all the ridge top Oak forests. The highest mean tree density ($607{\pm}33.60trees\;ha^{-1}$) was observed in Q. floribunda forest with lower mean total basal cover (TBC) value ($48.02{\pm}3.67m^2ha^{-1}$), whereas highest TBC value ($80.16{\pm}3.30m^2ha^{-1}$) was recorded for Q. semecarpifolia forest, with lowest mean stem density ($594{\pm}23.43stems\;ha^{-1}$). The total biomass density (TBD) across three Oak forests ranged between $497.32{\pm}83.70$ (FT1) and $663.16{\pm}93.85t\;ha^{-1}$ (FT3), while the total carbon density (TCD) values ranged between $228.75{\pm}22.27$ (FT1) and $304.31{\pm}18.12t\;ha^{-1}$ (FT3). Most of the tree species were found with good regeneration (GR) status (average 45%) in all the forest types whereas, few species were found not regenerating (NR) (average 17%) however, few new recruitments were also recorded. ANOVA (Post-Hoc Tukey's test at 5% significance level) indicated significant forest-wise differences in TBC, TBD and TCD (in tree layer); family and evenness (in shrub layer only) values, while insignificant differences were noticed in density values of tree, seedling and herb layer.
Quality Measurement Of Template Models And Automatic Template Model Selection
Hyohoon Choi,Ram Mohan Gupta,Sungho Suh 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Template matching is a common method of finding the corresponding points between images for image alignment. Normally the template selection are done manually. This paper introduces a novel method of measuring the quality of a template and the method of selecting template models automatically using the measure. We define the qualities of a good template and derive the score function that measures the qualities using the edge information. This is a generic algorithm to suit to any industrial vision application.
Spatial data integration for disaster/emergency management: an Indian experience
V. Bhanumurthy,K. Ram Mohan Rao,G. Jai Sankar,P. V. Nagamani 대한공간정보학회 2017 Spatial Information Research Vol.25 No.2
Disaster/emergency management needs rapid sharing of essential database for effective decision making. It requires comprehensive and structured database elements for handling emergency situations. The essential database includes variety of multi-scale information covering core, disaster specific and non-spatial information for effective decision making. Every disaster is unique and requires specific information for effective handling of the situation in all the phases of emergency management. Spatial technologies enable effective disaster risk management to assess and map extent of natural events such as floods, cyclones, tsunami, landslide, earthquake, forest fire etc. These disaster products derived from space based inputs generated in near/real time are extremely useful for planning and decision making. However, building spatial database system is a complex task because of key challenges. In this article the concept of spatial data integration is defined for effective integration procedures, storage methods, analysis, and dissemination of these inputs as web services for decision support tools for effective disaster/ emergency management.