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Search Results: 1 - 10 of 6263 matches for " Achanta Ramakrishna Rao "
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Analytical Formulation of the Correction Factor Applied in Einstein and Barbarossa Equation (1952)
Achanta Ramakrishna Rao , Bimlesh Kumar
Journal of Hydrology and Hydromechanics , 2009, DOI: 10.2478/v10098-009-0004-2
Abstract: Einstein-Barbarossa velocity or resistance equation (1952) is widely used to find resistance to flow in alluvial channel. In order to validate the equation in all ranges (smooth to rough); they introduced a correction factor based on the Nikuradse measurement. This correction factor is determined from the graphical method, which can be erroneous. Present work reanalyzes the Nikuradse measurements and gives an analytical formulation for the correction factor.
Radial Basis Function Network Based Design of Incipient Motion Condition of Alluvial Channels with Seepage
Bimlesh Kumar, Gopu Sreenivasulu, Achanta Ramakrishna Rao
Journal of Hydrology and Hydromechanics , 2010, DOI: 10.2478/v10098-010-0010-4
Abstract: Incipient motion is the critical condition at which bed particles begin to move. Existing relationships for incipient motion prediction do not consider the effect of seepage. Incipient motion design of an alluvial channel affected from seepage requires the information about five basic parameters, i.e., particle size d, water depth y, energy slope Sf, seepage velocity vs and average velocity u. As the process is extremely complex, getting deterministic or analytical form of process phenomena is too difficult. Data mining technique, which is particularly useful in modeling processes about which adequate knowledge of the physics is limited, is presented here as a tool complimentary to model the incipient motion condition of alluvial channel at seepage. This article describes the radial basis function (RBF) network to predict the seepage velocity vs and average velocity u based on experimental data of incipient condition. The prediction capability of model has been found satisfactory and methodology to use the model is also presented. It has been found that model predicts the phenomena very well. With the help of the RBF network, design curves have been presented for designing the alluvial channel when it is affected by seepage.
Feasibility and Effectiveness of Provider Initiated HIV Testing and Counseling of TB Suspects in Vizianagaram District, South India
Shanta Achanta, Ajay M. V. Kumar, Sharath Burugina Nagaraja, Jyoti Jaju, Srinivas Rao Motta Shamrao, Ramakrishna Uppaluri, Rama Rao Tekumalla, Devesh Gupta, Ashok Kumar, Srinath Satyanarayana, Puneet K. Dewan
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041378
Abstract: Background Though internationally recommended, provider initiated HIV testing and counseling (PITC) of persons suspected of tuberculosis (TB) is not a policy in India; HIV seroprevalence among TB suspects has never been reported. The current policy of PITC for diagnosed TB cases may limit opportunities of early HIV diagnosis and treatment. We determined HIV seroprevalence among persons suspected of TB and assessed feasibility and effectiveness of PITC implementation at this earlier stage in the TB diagnostic pathway. Methods All adults examined for diagnostic sputum microscopy (TB suspects) in Vizianagaram district (population 2.5 million), in November-December 2010, were offered voluntary HIV counseling and testing (VCT) and assessed for TB diagnosis. Results Of 2918 eligible TB suspects, 2465(85%) consented to VCT. Among these, 246(10%) were HIV-positive. Of the 246, 84(34%) were newly diagnosed as HIV (HIV status not known previously). To detect a new case of HIV infection, the number needed to screen (NNS) was 26 among ‘TB suspects’, comparable to that among ‘TB patients’. Among suspects aged 25–54 years, not diagnosed as TB, the NNS was 17. Conclusion The seroprevalence of HIV among ‘TB suspects’ was as high as that among ‘TB patients’. Implementation of PITC among TB suspects was feasible and effective, detecting a large number of new HIV cases with minimal additional workload on staff of HIV testing centre. HIV testing of TB suspects aged 25–54 years demonstrated higher yield for a given effort, and should be considered by policy makers at least in settings with high HIV prevalence.
Purification of acidic protease from the cotyledons of germinating Indian bean (Dolichos lablab L. var lignosus) seeds
Vadde Ramakrishna, P Ramakrishna Rao
African Journal of Biotechnology , 2005,
Abstract: The positive correlation between the developments of acid, neutral and alkaline proteases (azocaseinolytic) with protein depletion suggest the involvement of these proteases in the degradation of proteins in germinating Indian bean. These proteases increased in the early stages of germination and decreased later. However, the activity of acid proteases was higher throughout the germination period compared with the activities of neutral and alkaline proteases. The acid protease from the cotyledons of 4-day old germinating Indian bean seedlings was purified to 152 folds by a five step procedure comprising - crude extract from cotyledons, (NH4)2SO4 fractionation, DEAE-cellulose, CM-cellulose and finally casein-agarose affinity chromatography. The molecular mass of acidic protease is 32 kDa. African Journal of Biotechnology Vol. 4 (7), pp. 703-707, 2005
Effect of Brassinosteroids on Germination and Seedling Growth of Radish (Raphanus sativus L.) under PEG-6000 Induced Water Stress  [PDF]
Kommavarapu Mahesh, Parshavaneni Balaraju, Bellamkonda Ramakrishna, Sadhu Seeta Ram Rao
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.412285
Abstract:

Effect of 24-epibrassinolide and 28-homobrassinolide on the germination and seedling growth of radish (Raphanus sativus) subjected to water stress being imposed by 15% (w/v) polyethylene glycol (equivalent to -2.95 bars of osmotic pressure) was studied. Brassinosteroids supplementation reduced the inhibitory effect of water stress on seed germination and seedling growth. The growth stimulation in radish seedlings by brassinosteroids under desiccation stress was associated with elevated levels of nucleic acids and soluble proteins and lowered activities of RNase. The mitigation of osmotic stress imposed by PEG was associated with increased scavenging of reactive oxygen species as reflected in elevated activities of superoxide dismutase, catalase and ascorbate peroxidase. Brassinosteroids also enhanced the accumulation of the osmolyte free proline in radish seedlings challenged with drought stress. The two brassinosteroids also maintained membrane integrity under water deficiency conditions as indicated by lowered lipid peroxidation reflecting in reduced MDA content. The results of present study demonstrate the protective role of brassinosteroids against PEG imposed water stress in radish seedlings.

Purification and characterization of cysteine protease from germinating cotyledons of horse gram
Rajeswari Jinka, Vadde Ramakrishna, Sridhar K Rao, Ramakrishna P Rao
BMC Biochemistry , 2009, DOI: 10.1186/1471-2091-10-28
Abstract: Cysteine protease (CPRHG) was purified to homogeneity with 118 fold by four step procedure comprising Crude extract, (NH4)2SO4 fractionation, DEAE-Cellulose and CM-sephacel chromatography from the 2 day germinating cotyledons of horse gram (Macrotyloma uniflorum (Lam.) Verdc.). CPRHG is a monomer with molecular mass of 30 k Da, was determined by SDS-PAGE and gel filtration. The purified enzyme on IEF showed two isoforms having pI values of 5.85 and 6.1. CPRHG composed of high content of aspartic acid, glutamic acid and serine. The enzyme activity was completely inhibited by pCMB, iodoacetate and DEPC indicating cysteine and histidine residues at the active site. However, on addition of sulfhydryl reagents (cysteine, dithiothreitol, glutathione and beta-ME) reverse the strong inhibition by pCMB. The enzyme is fairly stable toward pH and temperature. Immunoblot analysis shows that the enzyme synthesized as zymogen (preproenzyme with 81 kDa) and processed to a 40 kDa proenzyme which was further degraded to give 30 kDa active enzyme.It appears that the newly synthesized protease is inactive, and activation takes place during germination. CPRHG has a broad substrate specificity and stability in pH, temperature, etc. therefore, this protease may turn out to be an efficient choice for the pharmaceutical, medicinal, food, and biotechnology industry.Proteolytic enzymes are multifunctional enzymes that have many physiological functions in plants and animals including germination, senescence, apoptosis, complement activation, inflammation process etc. and also having commercial importance in food, leather and textile industry. Commercially they are extremely important as more than 60% of the total enzyme market is made up of proteases; they are isolated from plants, animals, bacteria and fungi. Proteolytic enzymes from the plant sources have received special attention because of their broad substrate specificity as well active in wide range of pH, temperature, and in presence
EVALUATING CUSTOMER PREFERENCES IN LEAN PRODUCT DESIGN-AN AHP APPROACH
T. Venkatamuni,A.Ramakrishna Rao
International Journal of Engineering Science and Technology , 2010,
Abstract: Lean Product design has been generally accepted as an important approach to reduce the time to design,manufacture and market the product. For years, the focus of concurrency has been on design and manufacturing.With customers’ inputs becoming more crucial for product development, incorporating customers’ preferences intothe design process has become significant in the continuing search for reducing time to market. Because customers’preferences involve complex interdependency on factors such as product attributes, alternatives and competitiveproducts. This paper presents a review on various methods that incorporate customer’s preferences for collectingcustomer information from traditional product development to Lean product development stage. Analyticalhierarchical process is developed for Lean product development for measuring all the attributes with same scale andweights, and used in linear programming for identifying the customer choice more accurately than other methodsused for incorporating customer preferences in product design.
EDMS based workflow for Printing Industry
Prathap Nayak,Anuradha Rao,Ramakrishna Nayak
Acta Graphica : Journal for Printing Science and Graphic Communications , 2012,
Abstract: Information is indispensable factor of any enterprise. It can be a record or a document generated for every transaction that is made, which is either a paper based or in electronic format for future reference. A Printing Industry is one such industry in which managing information of various formats, with latest workflows and technologies, could be a nightmare and a challenge for any operator or an user when each process from the least bit of information to a printed product are always dependendent on each other. Hence the information has to be harmonized artistically in order to avoid production downtime or employees pointing fingers at each other. This paper analyses how the implementation of Electronic Document Management System (EDMS) could contribute to the Printing Industry for immediate access to stored documents within and across departments irrespective of geographical boundaries. The paper outlines initially with a brief history, contemporary EDMS system and some illustrated examples with a study done by choosing Library as a pilot area for evaluating EDMS. The paper ends with an imitative proposal that maps several document management based activities for implementation of EDMS for a Printing Industry.
Flow visualization and study of CHF enhancement in pool boiling with Al2O3 - Water nano-fluids
Hegde Ramakrishna N.,Rao Shrikantha,Reddy Ranapratap
Thermal Science , 2012, DOI: 10.2298/tsci100511095h
Abstract: Pool boiling heat transfer characteristics of Al2O3-Water nanofluids is studied experimentally using a NiCr test wire of 36 SWG diameter. The experimental work mainly concentrated on i) change of Critical Heat Flux(CHF) with different volume concentrations of nanofluid ii) flow visualization of pool boiling using a fixed concentration of nanofluid at different heat flux values. The experimental work revealed an increase in CHF value of around 48% and flow visualization helped in studying the pool boiling behaviour of nanofluid. Out of the various reasons which could affect the CHF enhancement, surface roughness plays a major role in pool boiling heat transfer.
A MAC Technique for VoIP Services Using Back off Algorithm in IEEE 802.11e Networks
K. Sumalatha,Dr. Ramakrishna Rao T. K
International Journal of Computer Technology and Applications , 2012,
Abstract: In the advent of emerging information super highway, voice over Internet Protocol has become a vital service with the demand for high quality of requirements in Wireless Local Area Network(WLANs). The IEEE 802.11e Standard has been recently introduced to mark the Quality of Service (QoS) competence in the ever evolving wireless local area networks. This 802.11e brings contention window, based on Enhanced Distribution Channel Access technique that offers a selected traffic to ensure least bandwidth required for the time specific applications. The EDCA technique resets statistically the contention window of the mobile station after each successful transmission. The static behavior of EDCA does not adapt to the network state hence reduces the network usage which also results in bad performance and reduced link utilization whenever the demand arise for a link utilization increases. In IEEE 802.11 Wireless Local Area Networks (WLANs), network nodes experiencing collisions on the shared channel need to backoff for a random period of time and the Contention Window (CW) is dynamically controlled by the Back off algorithm. The initial step is to design an efficient back off algorithm for wireless ad hoc network is analysis of the existing back off algorithms in wireless ad hoc networks. In this paper, we have considered two important wireless ad-hoc network scenarios: (i) Node Mobility state (ii) Transmission Range state and evaluate both on the impact of mobility i.e. node speed and the impact of transmission range of nodes on the performance. In this paper the performance of the proposed technique and proposed traffic is evaluated and is compared with the original IEEE802.11a technique. The results obtained exhibits that the proposed adaptive technique increases the channel utilization along with the boosted throughput, as well as providing QOS requirements in terms of packet delay, packet drop rate, jitter, packet loss rate.
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