Rama Krishna Rao M | Jntu Kakinada (original) (raw)

Papers by Rama Krishna Rao M

International Journal of Research, 2018

DC to DC converters are the electronic devices used to step up or step down the DC voltage level,... more DC to DC converters are the electronic devices used to step up or step down the DC voltage level, whenever the equipment fails to operate at maximum efficiency. If a electrical device as a power factor less than one, that means more input current must be supplied for a given output power dissipation and more powerful source is required to deliver the required output power. The main objective of this project is to improvement of power factor of the system by using MSEPIC converter and also the theoretical and experimental (simulation) results with the MSEPIC converter are comparing with the classical boost converter topology by using MATLAB software.

Trabajos de Estadistica, 1961

Trabajos de Estadistica, 1960

ResumenEl propósito del autor es establecer la relación entre los métodos de estimación del perío... more ResumenEl propósito del autor es establecer la relación entre los métodos de estimación del período y amplitud de un modelo armónico, por Periodograma y Máxima Verosimilitud o Mínimos Cuadrados. También se da una fórmula para el límite inferior de la varianza de un estimador del período. En la sección 5 se dan las «covarianzas asintóticas» de los estimadores.

Current Science, 2006

It is well known that multipath error is one of the major error sources affecting the positional ... more It is well known that multipath error is one of the major error sources affecting the positional accuracy of Global Positioning System (GPS). Although the multipath effect can be reduced by choosing sites without multipath reflectors or using proper antennas to mitigate the reflected signal, it is difficult to eliminate all multipath effects from GPS observations. Here, a technique based on vertical ground planes to effectively reduce the multipath occurring at ±5° of the horizon is presented.

The present research work is to determine the buckling load in FRP(fibre reinforced plastic) thin... more The present research work is to determine the buckling load in FRP(fibre reinforced plastic) thin cylinder, which is subjected to uniaxial compression using 2-D finite element analysis. The commercial finite element analysis software ANSYS has been successfully executed and the finite element model is validated. The buckling load is evaluated by varying the boundary conditions, length to diameter ratio (L/d), thickness to diameter ratio (h/d) and number of layers (n). The effect of boundary conditions, (L/d), (h/d), (n) on the buckling load is discussed. The results show that buckling load is more in clamped-clamped boundary condition, decreases with increase in length to diameter ratio, increases with increase in thickness to diameter ratio and remains constant with number of layers.

Physical Review B, 1995

57Fe Mössbauer studies were carried out on the Dy0.73Tb0.27Fe2-xNix and Ho0.85Tb0.15Fe2-yNiy syst... more 57Fe Mössbauer studies were carried out on the Dy0.73Tb0.27Fe2-xNix and Ho0.85Tb0.15Fe2-yNiy systems (x=y=0, 0.5,1.0,1.5). The spectra were recorded in the temperature range 18-675 K. The variation of hyperfine field at 18 K with Ni concentration showed a maximum at x=0.5 as well as y=0.5 which has been attributed to the narrowing of the 3d bands by the substitution of Ni.

Physica Status Solidi (a), 1983

Catalysis Letters, 1998

The selective vapour-phase synthesis of 2-methylquinoline by alkylation of quinoline with methano... more The selective vapour-phase synthesis of 2-methylquinoline by alkylation of quinoline with methanol was carried out over HY, HZSM-5(30), CrHY, CeHY, LaHY, LaKHY and CeHZSM-5(30) zeolites in a fixed-bed reactor at atmospheric pressure. The yields of 2-methylquinoline over modified zeolites, especially those of doubly promoted LaKHY, were found to be higher than those of unmodified zeolites. The maximum yield of 2-methylquinoline

Synthetic Communications, 1984

The discovery of synthetic pyrethroids with increased insecticidal activity and low mammalian tox... more The discovery of synthetic pyrethroids with increased insecticidal activity and low mammalian toxicity led to abundance of new synthetic results in the chemistry of pyrethroids . Many of these methods adopted on an industrial scale make use of sigmatropic rearrangement, radical addition and nucleophilic ring closer with carbanions. Herein we report a simple and stereospecific route for the synthesis of ethyl trans-chrysanthernate (1) by utilizing carbonyl stabilized sulphuranes. Although the use of Sulphurane was demonstrated at a much earlier stage for the synthesis of methyl trans-chrysanthe-mate, the present approach makes use of simple reagents and offers some operational advantages.

2013 International Conference on Advances in Computing, Communications and Informatics (ICACCI), 2013

ABSTRACT This paper investigates the development of a concave lens integration concept in a conic... more ABSTRACT This paper investigates the development of a concave lens integration concept in a conical horn antenna, and its considerate use in the Received Signal Strength (RSS) enhancement of outdoor based (60 GHz) mm mesh networks. A conical horn antenna is developed in High Frequency Structural Simulator (HFSS) with a gain of 12 dB and Half Power Beam Width (HPBW) of 10° to model the RSS in a street. Ray tracing based model shows that there are only limited paths which are significant for a highly directional link under consideration. The results obtained are modeled in matlab software. Further, when a concave lens is integrated into the same horn antenna an increase of 5 dB in gain is obtained there by increasing the efficiency. With the incorporation of concave lens, gain has increased resulting in a better RSS of mm wave links at similar transmitted power. An analogous street model is developed in Wireless Insite (WI) with similar concave lens antenna dimensions, gain and transmitted power. The simulated result also shows an increment in RSS whose values are comparable with modeled matlab values. The analysis of this approach can be an alternative to the concept of multiple antenna technique and also the energy efficient antenna for WPAN applications.

Pollack Periodica, 2008

Computational load balancing plays a prominent role on the success of domain decomposition based ... more Computational load balancing plays a prominent role on the success of domain decomposition based finite element computations on parallel computers. Computational load balancing is achieved through mesh partitioning. In this paper, a mesh-partitioning algorithm is proposed for generating sub-meshes with optimal shape using a steady state elite preserving evolutionary algorithm (EA). Numerical experiments have been conducted by solving several practical engineering problems. Comparisons have also been made with its multi-level counter part by solving several benchmark problems. Numerical studies indicate that performance of the proposed mesh-partitioning algorithm is either comparable or superior to the multi-level algorithm.

The Journal of Zoo Animal Medicine, 1984

... Rec. 104:146, 1979. 2. Mahanta, PN, Das, SK, Dutta, PK, Chakrabarty, AK and Boro, BR: Foot-an... more ... Rec. 104:146, 1979. 2. Mahanta, PN, Das, SK, Dutta, PK, Chakrabarty, AK and Boro, BR: Foot-and mouth disease in free living mithun. Journal of Res., Assam Agri. Univ. ... K. Lakshmana Char* S. Ramanathan* M. Rama Krishna Rao* K. Chandrasekhara Rao* S. Vasantha Rao* ...

Tetrahedron Letters, 1993

Compound 5: 1 H-NMR (CDCl 3 , 200 MHz): δ 0.02 (s, 6H, Me 2 Si), 0.87 (s, 9H, (CH 3 ) 3 CSi), 1.3... more Compound 5: 1 H-NMR (CDCl 3 , 200 MHz): δ 0.02 (s, 6H, Me 2 Si), 0.87 (s, 9H, (CH 3 ) 3 CSi), 1.34, 1.48 (2s, 6H, Me 2 C), 3.44 (d, 1H, J 8.0 Hz, H-6a), 3.59 (d, 1H, J 8.0 Hz, H-6b), 4.12 (d, 1H, J 3.4 Hz, H-3), 4.29 (d, 1H, J 3.4, H-4), 4.48, 4.68 (ABq, 2H, PhC 2 ), 4.59 (d, 1H, J ...

Tetrahedron Letters, 1992

... Britain Pergamm Press LJ First Unambiguous Total Synthesis of Hericenone A Proposed Structure... more ... Britain Pergamm Press LJ First Unambiguous Total Synthesis of Hericenone A Proposed Structure Revised AV Rama Rao and Ravindra G Reddy Indian Institute ... This was then transformed to the desired diene (7) (Scheme 1) Scheme I OCH3 OCH3 OCH3 CO CH a &quot;kb 2 3 O ...

Measurement Science and Technology, 1996

... M Senthil Kumar, KV Reddy and KVS Rama Rao ... shown schematically in figure 1. The sample ho... more ... M Senthil Kumar, KV Reddy and KVS Rama Rao ... shown schematically in figure 1. The sample holder is made of thin-walled stainless steel tube of about 5 mm diameter and 0.1 mm wall thickness and a sample mount made of copper which is brazed to the bottom end of the SS ...

The Journal of Organic Chemistry, 1986

Coriolic acid (l), a divalent cation ionophore and a self-defensive substance against blast disea... more Coriolic acid (l), a divalent cation ionophore and a self-defensive substance against blast disease in rice plant, has been synthesized by two convenient approaches.

The Journal of Organic Chemistry

Journal of Materials Science Letters, 1985

Journal of Computational and Applied Mathematics, 2008

In this paper a review of several different methods of solution of fuzzy equations will be given,... more In this paper a review of several different methods of solution of fuzzy equations will be given, particularly: • methods for solution of systems of linear equations with coefficients linearly dependent on a vector of fuzzy parameters (called parametric fuzzy linear systems), • special algorithm which was designed for mathematical modelling of truss and frame structures with uncertain (interval) parameters, • approximate method of solution of equations with interval parameters which is based on sensitivity analysis.

Journal of Composite Materials, 2009

In this article, a new algorithm for solving multi-objective optimization problems is proposed by... more In this article, a new algorithm for solving multi-objective optimization problems is proposed by extending the single objective scatter search template to deal with multiple objectives. The features like Pareto dominance, density estimation, and an external archive to store the nondominated solutions are added. The traditional solution combination of scatter search template is however replaced with two-point crossover operator being used in evolutionary algorithms in order to improve the convergence characteristics of the proposed scatter search algorithm. The resulting hybrid scatter search algorithm is employed to solve stacking sequence optimization of hybrid fiber-reinforced composite plate, cylindrical shell, and pressure vessel. Performance metrics are used to demonstrate the effectiveness of the proposed algorithm over other popular evolutionary algorithms like NSAGA-II, PAES, Micro-GA, and MOPSO.