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Search Results: 1 - 10 of 223863 matches for " R. Santhanakrishnan "
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Diet Composition of the Barn Owl Tyto alba (Aves: Tytonidae) and Spotted Owlet Athene brama (Aves: Strigidae) Coexisting in an Urban Environment
A. Mohamed Samsoor Ali, R. Santhanakrishnan
Podoces , 2012,
Abstract: The comparative diet of the Barn OwlTyto alba and the Spotted Owlet Athene brama were studied in an urban habitat of Madurai District, Tamil Nadu, Southern India, during January–December 2008. Regurgitated pellets of these two owl species were analysed to understand their dietary composition. The diet of the Barn Owl mainly comprised small mammals such as Suncus murinus(51.9%) and Rattus rattus(28.6%), while the diet of the Spotted Owlet comprised mostly arthropods (84.9%); Coleoptera (40.9%) and Orthoptera (32.4%). Food niche overlap between the Barn Owl and the Spotted Owlet in overall diet was 6.5%,which indicated very low degree of overlap.
Study on Performance and Emission Characteristics of a Compression Ignition Engine Fueled with Diesel-2 Ethoxy Ethyl Acetate Blends  [PDF]
R. Senthil, M. Kannan, B. Deepanraj, V. Nadanakumar, S. Santhanakrishnan, P. Lawrence
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.311141
Abstract: Diesel engines are the major contributors of various types of air polluting gases like carbon monoxide, oxides of nitrogen, smoke, etc. Improvement of fuel properties is essential for suppression of Diesel pollutant emissions along with the optimization of design factors and after treatment equipment. Studies conducted in the past have shown that a significant reduction were obtained in the emissions using oxygenates. This paper investigates the performance and emission characteristics of a direct injection Diesel engine fueled with 2 Ethoxy Ethyl Acetate (EEA) blends. Different fuel blends which contain 5%, 10% and 15% of EEA were prepared and the effect of these blends on performance and emissions were studied on a single cylinder direct injection Diesel engine. The blends were tested under different load conditions and the result showed that EEA blended fuels improves the performance of the engine and reduce the emission level significantly.
Broad Leaves in Strong Flow
Laura Miller,Arvind Santhanakrishnan
Physics , 2013,
Abstract: Flexible broad leaves are thought to reconfigure in the wind and water to reduce the drag forces that act upon them. Simple mathematical models of a flexible beam immersed in a two-dimensional flow will also exhibit this behavior. What is less understood is how the mechanical properties of a leaf in a three-dimensional flow will passively allow roll up into a cone shape and reduce both drag and vortex induced oscillations. In this fluid dynamics video, the flows around the leaves are compared with those of simplified sheets using 3D numerical simulations and physical models. For some reconfiguration shapes, large forces and oscillations due to strong vortex shedding are produced. In the actual leaf, a stable recirculation zone is formed within the wake of the reconfigured cone. In physical and numerical models that reconfigure into cones, a similar recirculation zone is observed with both rigid and flexible tethers. These results suggest that the three-dimensional cone structure in addition to flexibility is significant to both the reduction of vortex-induced vibrations and the forces experienced by the leaf.
Leaf roll-up and aquaplaning in strong winds and floods
Laura Miller,Gregory Herschlag,Arvind Santhanakrishnan
Physics , 2008,
Abstract: Flexible plants, fungi, and sessile animals are thought to reconfigure in the wind and water to reduce the drag forces that act upon them. In strong winds, for example, leaves roll up into cone shapes that reduce flutter and drag when compared to paper cut-outs with similar shapes and flexibility. During flash floods, herbaceous broad leaves aquaplane on the surface of the water which reduces drag. Simple mathematical models of a flexible beam immersed in a two-dimensional flow will also reconfigure in flow. What is less understood is how the mechanical properties of a two-dimensional leaf in a three-dimensional flow will passively allow roll up and aquaplaning. In this study, we film leaf roll-up and aquaplaning in tree and vine leaves in both strong winds and water flows.
A numerical study of the effects of bell pulsation dynamics and oral arms on the exchange currents generated by the upside-down jellyfish Cassiopea spp
Christina Hamlet,Arvind Santhanakrishnan,Laura A. Miller
Physics , 2010,
Abstract: Mathematical and experimental studies of the flows generated by jellyfish have focused primarily on mechanisms of swimming. More recent work has also considered the fluid dynamics of feeding from currents generated during swimming. Here the benthic lifestyle of the upside down jellyfish (Cassiopea spp.) is capitalized upon to explore the fluids dynamics of feeding uncoupled from swimming. A mathematical model is developed to capture the fundamental characteristics of the motion of the unique concave bell shape. Given the prominence of the oral arms, this structure is included and modeled as a porous layer that perturbs the flow generated by bell contractions. The immersed boundary method is used to solve the fluid-structure interaction problem. Velocity fields obtained from live organisms using digital particle image velocimetry were used to validate the numerical simulations. Parameter sweeps were used to numerically explore the effects of changes in pulse dynamics and the properties of the oral arms independently. Numerical experiments allow the opportunity to examine physical effects and limits within and beyond the biologically relevant range to develop a better understanding of the system. The presence of the prominent oral arm structure in the field of flow increased the flux of new fluid from along the substrate to the bell. The numerical simulations also showed that the presence of pauses between bell expansion and the next contraction alters the flow of the fluid over the bell and through the oral arms.
Identification of Source of Rumors in Social Networks with Incomplete Information
Alireza Louni,Anand Santhanakrishnan,K. P. Subbalakshmi
Computer Science , 2015,
Abstract: Rumor source identification in large social networks has received significant attention lately. Most recent works deal with the scale of the problem by observing a subset of the nodes in the network, called sensors, to estimate the source. This paper addresses the problem of locating the source of a rumor in large social networks where some of these sensor nodes have failed. We estimate the missing information about the sensors using doubly non-negative (DN) matrix completion and compressed sensing techniques. This is then used to identify the actual source by using a maximum likelihood estimator we developed earlier, on a large data set from Sina Weibo. Results indicate that the estimation techniques result in almost as good a performance of the ML estimator as for the network for which complete information is available. To the best of our knowledge, this is the first research work on source identification with incomplete information in social networks.
Verbal autopsy of 48 000 adult deaths attributable to medical causes in Chennai (formerly Madras), India
Vendhan Gajalakshmi, Richard Peto, Santhanakrishnan Kanaka, Sivagurunathan Balasubramanian
BMC Public Health , 2002, DOI: 10.1186/1471-2458-2-7
Abstract: Trained non-medical graduates with at least 15 years of formal education interviewed the surviving family members or an associate of the deceased to write a report on the complaints, symptoms, signs, duration and treatment details of illness prior to death. Each report was reviewed centrally by two physicians independently. The reliability was assessed by comparing deaths attributed to cancer by VA with records in Vital Statistics Department and Chennai Cancer Registry.The VA reduced the proportion of deaths attributed to unspecified medical causes and unknown causes from 37% to 7% in early adult life and middle age (25–69 yrs) and has yielded fewer unspecified causes (only 10%) than the death certificate. The sensitivity of VA to identify cancer was 94% in the age group 25–69.VA is practicable for deaths in early adult life or middle age and is of more limited value in old age. A systematic program of VA of a representative sample of deaths could assign broad causes not only to deaths in childhood (as has previously been established) but also to deaths in early adult life and middle age.Chennai is a South Indian city of 4.2 million people (in mid-1997) with 33 registered and 35 private burial or cremation grounds. The health authority requires a medical certificate for all deaths at the time of disposal of the body. A medical certificate giving the cause of death can be obtained before taking the body to the burial ground either from the hospital where death took place or (for the 75% of adult deaths attributable to medical causes that take place at home) from a private medical practitioner, which specifies whether the death was due to suicide, homicide, accident, or disease, and which should (but often does not) specify which disease was involved. Most of the time the private medical practitioner will not have treated or examined the deceased. Hence, the information on the death certificates of those who die at home may not reliably describe the underlying cause,
Person Identification Using Fingerprint by Hybridizing Core Point and Minutiae Features
M. Ezhilarasan,D. Suresh Kumar,,S. Santhanakrishnan,S. Dhanabalan
International Journal on Computer Science and Engineering , 2010,
Abstract: Fingerprint recognition refers to the automated method of verifying a match between two human fingerprints. Fingerprints are one of many forms of biometrics used to identify an individual and verify their identity. The nonchangeability of Fingerprints during the human life span and the uniqueness of each individual’s fingerprints are the basis for using fingerprints for identification purposes. The main objective is to provide a high secure unibiometric system using thefingerprint of individuals. The fingerprint trait is chosen becauseof its availability, reliability and high accuracy. Moreover the fingerprint based biometric system can be implemented easily.
Successful stenting of anastomotic stenosis of the left pulmonary artery after single lung transplantation
S.K. Banerjee,K. Santhanakrishnan,L. Shapiro,J. Dunning
European Respiratory Review , 2011,
Nanostructured CuO Thin Films Prepared through Sputtering for Solar Selective Absorbers
Senthuran Karthick Kumar,Sepperumal Murugesan,Santhanakrishnan Suresh,Samuel Paul Raj
Journal of Solar Energy , 2013, DOI: 10.1155/2013/147270
Abstract: Nanostructured cupric oxide (CuO) thin films have been deposited on copper (Cu) substrates at different substrate temperatures and oxygen to argon gas ratios through direct current (DC) reactive magnetron sputtering. The deposited CuO thin films are characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), profilometry, and spectrophotometry techniques. The crystalline phases, morphology, optical properties, and photothermal conversion efficiency of the CuO thin films are found to be significantly influenced by the change in substrate temperature and oxygen to argon gas ratio. The variations in the substrate temperature and oxygen to argon gas ratio have induced changes in Cu+ and Cu2+ concentrations of the CuO thin films that result in corresponding changes in their optical properties. The CuO thin film prepared at a substrate temperature of 30°C and O2 to Ar gas ratio of 1?:?1 has exhibited high absorptance and low emittance; thus, it could be used as a solar selective absorber in solar thermal gadgets. 1. Introduction Solar collectors have gained immense interest owing to their potential applications in the field of water and air heating systems and cooling of buildings [1]. A thin film coated on a metal substrate having selective spectral response in the solar radiation is called selective coating. An ideal selective coating should have high solar absorptance ( ) in the visible and near infrared region (0.3–2?μm) and low thermal emittance ( ) in the infrared region (2–20?μm) of the solar spectrum in order to fully utilize the high energy radiation as well as to minimize undesired thermal losses [2, 3]. Hence, the effective use of solar energy for thermal applications requires the development of optically efficient solar selective coatings. The economic viability of the conversion process of solar energy into thermal energy depends on low-cost production and high durability of the selective coating under severe operational conditions along with efficient collection of solar radiation [4]. In this connection, several solar selective coatings have been developed in order to use them as selective absorbers in flat-plate collectors. Cupric oxide (CuO) is a p-type semiconductor with bandgap energy of 1.2?eV [5]. It has been widely investigated for various applications such as solar energy conversion, optoelectronics, batteries, sensors, semiconductors, and catalysis [6, 7]. The nontoxicity of CuO and abundant availability of its constituents make it an advantageous and promising material for
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