Wyniki wyszukiwania dla: K. Ravikumar

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Microstructural characteristics and mechanical behaviour of aluminium hybrid composites reinforced with groundnut shell ash and B₄C

L. Venkatesh, T. V. Arjunan, K. Ravikumar

Journal of the Brazilian Society of Mechanical Sciences and Engineering > 2019 > 41 > 7 > 1-13

In this study, aluminium hybrid composites were fabricated by reinforcing eco-friendly agrowaste, groundnut shell ash and boron carbide using squeeze casting method. Groundnut shell ash and boron carbide were added in ratios of 2.5:7.5, 5:5 and 7.5:2.5 percentages by weight. The impact on mechanical properties namely density, hardness, tensile strength, impact strength was studied, and the results...

artykuł

Perovskite Ceramics as New-Generation Materials for Orthopedic Applications

Ashutosh Kumar Dubey, K. Ravikumar, Bikramjit Basu

Transactions of the Indian Institute of Metals > 2019 > 72 > 8 > 1999-2010

The piezoelectric properties of ferroelectric ceramics have been widely investigated in the materials science community, but relatively less is known about such properties of natural living system. Inspired by the knowledge that the piezoelectric properties influence the metabolic activities of natural bone, the design and development of bone-mimicking electrically active synthetic orthopedic implant...

artykuł

Analysis of Electrical Analogue of a Biological Cell and Its Response to External Electric Field

K. Ravikumar, Bikramjit Basu, Ashutosh Kumar Dubey

Regenerative Engineering and Translational Medicine > 2019 > 5 > 1 > 10-21

The use of electric field stimulation to elicit a desired cell/tissue response has become a versatile strategy in regenerative medicine. Using an array of cell types and biomaterial substrates, our group has experimentally investigated the influence of external electric field parameters on the modulation of cellular functionality in vitro. However, the mechanism of action of electric field is not...

artykuł

A Prospective Comparative Study on Improvement of Hyperthyroid Cardiovascular Dysfunction in Patients Undergoing Total Thyroidectomy Versus Medical Management

S. Muthukumar, K. Ravikumar, S. Dhalapathy, T. Gomathy, więcej

World Journal of Surgery > 2018 > 42 > 5 > 1408-1414

Introduction Cardiovascular dysfunction (CVD) is a well-recognized complication in patients with hyperthyroidism and is the major cause of mortality. Very few studies have compared the outcome of CVD following different treatment modalities. In this study we intended to compare treatment modalities (antithyroid drugs vs surgery) for reversal of CVD. Materials and methods Patients with newly detected...

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Influence of Annealing Temperature on Structural and dc Electrical Properties of SnO₂ Thin Films for Schottky Barrier Diodes

K. Ravikumar, S. Agilan, N. Muthukumarasamy, M. Raja, więcej

Silicon > 2018 > 10 > 4 > 1591-1599

This paper reports about the influence of annealing temperature on the structural, morphological, optical and electrical properties of SnO₂ thin films prepared by the spin-coating method. The structural analysis reveals the presence of rutile SnO₂ with tetragonal structure and its defects are reduced in higher annealing temperatures. SEM images show that the size of the grains was improved due to...

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Cost‐effectiveness of focused ultrasound, radiosurgery, and DBS for essential tremor

Vinod K. Ravikumar, Jonathon J. Parker, Traci S. Hornbeck, Veronica E. Santini, więcej

Movement Disorders > 32 > 8 > 1165 - 1173

Background Essential tremor remains a very common yet medically refractory condition. A recent phase 3 study demonstrated that magnetic resonance‐guided focused ultrasound thalamotomy significantly improved upper limb tremor. The objectives of this study were to assess this novel therapy's cost‐effectiveness compared with existing procedural options. Methods Literature searches of magnetic resonance‐guided...

artykuł

Synergy of substrate conductivity and intermittent electrical stimulation towards osteogenic differentiation of human mesenchymal stem cells

K. Ravikumar, Sunil Kumar Boda, Bikramjit Basu

Bioelectrochemistry > 2017 > 116 > C > 52-64

Human Mesenchymal Stem cells (hMSCs) have the unique potential to differentiate into multiple cell types. Depending on the cellular microenvironment (physical and biochemical cues), hMSCs can be directed to differentiate into osteogenic, chondrogenic, myogenic and adipogenic lineages. Among the strategies available to direct stem cell fate processes, electrical stimulation based approach has been...

artykuł

Characterization of mechanical properties of aluminium/tungsten carbide composites

K. Ravikumar, K. Kiran, V.S. Sreebalaji

Measurement > 2017 > 102 > C > 142-149

This study deals with the investigation on mechanical properties of aluminium alloy (AA 6082) composites reinforced with tungsten carbide particles. Stir casting process was employed to fabricate the aluminium composite specimen by varying tungsten carbide in 2, 4, 6, 8 and 10% by weight. The composites were exposed to density, hardness, tensile and impact studies. Scanning electron microscope was...

artykuł

Unprecedented folding in linker based flexible tripodal molecule and their conformational analysis

Archana Gaurav, Ranjeet Kumar, Hariom Gupta, K. Ravikumar, więcej

Journal of Molecular Structure > 2017 > 1134 > C > 781-788

Here, we first time report the flexible tripodal molecules, contained propylene as a linker, thiocyanuric acid as central core and, p-nitro phenol 1 and pyridazinone 2 as terminal for conformational studies. The conformational studies of these tripodal molecules have been carried by X-ray crystallography, 2D-NOESY spectra and computational studies. Both the molecules have shown folded conformations...

artykuł

Evaluation of zirconia reinforced mica glass ceramics for veneering zirconia

S. Gali, K. Ravikumar, B.V. Sreenivasamurthy, B. Bikramjit

Dental Materials > 2017 > 33 > S1 > e35-e36

artykuł

The renaissance in redox flow batteries

M. K. Ravikumar, Suman Rathod, Nandini Jaiswal, Satish Patil, więcej

Journal of Solid State Electrochemistry > 2017 > 21 > 9 > 2467-2488

Although redox flow batteries were invented as early as 1954, no system development took place until NASA demonstrated an Fe/Cr redox flow battery system in 1970s. In hibernation for several years, redox flow battery systems have begun to catch the attention of policy makers globally. The resurrection of redox flow batteries rests heavily on their techno-economic feasibility as large-scale energy...

artykuł

Foramen Magnum Meningioma with Brainstem Compression During Pregnancy

Omar Choudhri, Vinod K. Ravikumar, Melanie Hayden Gephart

World Neurosurgery > 2016 > 91 > C > 671.e9-671.e12

Meningiomas can present during pregnancy as the result of hormonal as well as fluid changes. Foramen magnum meningiomas are particularly rare. We present the first reported case successfully treated during pregnancy.A 34-year-old female patient in her second trimester of pregnancy presented with a several-week history of neck pain, clonus, and right-sided upper extremity weakness. Magnetic resonance...

rozdział

A secure and energy efficient cluster optimization by using hierarchial clustering technique

H. V. Chaitra, G. K. Ravikumar

2016 3rd International Conference on Devices, Circuits and Systems (ICDCS) > 93 - 97

2016 3rd International Conference on Devices, Circuits and Systems (ICDCS)

Wireless sensor based communication system is an ever growing sector in the industry of communication. Wireless infrastructure is a network that enables correspondence between various devices associated through a infrastructure protocol. Due to battery constrained the network performance such as security and device lifetime will get reduced i.e. if the energy of the wireless sensor node (WSN's) is...

artykuł

Acquired toxoplasmosis presenting with a brainstem granuloma in an immunocompetent adolescent

Nitin Manwani, K. Ravikumar, V. Viswanathan, Santosh Mohan Rao, więcej

Indian Pediatrics > 2016 > 53 > 2 > 159-161

Background Toxoplasmosis is an uncommon disease in immunocompetent people. Case characteristics We report an adolescent boy with central nervous system toxoplasmosis who presented with progressive lower cranial nerve palsies and a ring-enhancing lesion on neuroimaging. Intervention Diagnosis of toxoplasmosis was confirmed on histopathology of the excised lesion. Message Toxoplasmosis should...

rozdział

Transformerless Dynamic Voltage Restorer for voltage sag mitigation

V. Ansal, K. Ravikumar, P. Parthiban

2016 Biennial International Conference on Power and Energy Systems: Towards Sustainable Energy (PESTSE) > 1 - 4

2016 Biennial International conference on Power and Energy Systems: Towards Sustainable Energy (PESTSE)

Dynamic Voltage Restorers are identified to be cost effective solution for protecting sensitive loads from voltage related power quality issues. The extension of cost reduction and efficiency can be improved by eliminating the injection transformer. This paper discusses a transformer-less dynamic voltage restorer based on three-single phase Voltage Source Inverters(VSI). Since the DVR does not have...

artykuł

Mica glass ceramics with yttria stabilized zirconia for dental restorations

S. Gali, K. Ravikumar, Bv. Sreenivasamurthy, B. Basu

Dental Materials > 2016 > 32 > S1 > e101

artykuł

Differential viability response of prokaryotes and eukaryotes to high strength pulsed magnetic stimuli

Sunil Kumar Boda, K. Ravikumar, Deepak K. Saini, Bikramjit Basu

Bioelectrochemistry > 2015 > 106 > Part B > 276-289

The present study examines the efficacy of a high strength pulsed magnetic field (PMF) towards bacterial inactivation in vitro, without compromising eukaryotic cell viability. The differential response of prokaryotes [Staphylococcus aureus (MRSA), Staphylococcus epidermidis, and Escherichia coli], and eukaryotes [C2C12 mouse myoblasts and human mesenchymal stem cells, hMSCs] upon exposure to varying...

rozdział

A message passing interface to support fast data access in distributed cloud environment along with master and slave communication

V. Kumar, K. Ravikumar, S. S. Aravinth, B. Rajkumar

Second International Conference on Current Trends In Engineering and Technology - ICCTET 2014 > 309 - 312

2014 2nd International Conference on Current Trends in Engineering and Technology (ICCTET)

Cloud computin is the emerging trend used by all industries as a successful business driver. The improvement of cloud computing demanding services will be based on the fast access network provisioning. Through this fast access the data between the nodes will be exchanged rapidly. This improves the better performance, availability and consistency of data to be communicated by hosts. In existing system...

artykuł

An actor–critic algorithm for multi-agent learning in queue-based stochastic games

D. Krishna Sundar, K. Ravikumar

Neurocomputing > 2014 > 127 > Complete > 258-265

We consider state-dependent pricing in a two-player service market stochastic game where state of the game and its transition dynamics are modeled using a semi-Markovian queue. We propose a multi-time scale actor–critic based reinforcement algorithm for multi-agent learning under self-play and provide experimental results on Nash convergence.

rozdział

Secure Multiparty Electronic Payments Using ECC Algorithm: A Comparative Study

K. Ravikumar, A. Udhayakumar

2014 World Congress on Computing and Communication Technologies > 132 - 136

2014 World Congress on Computing and Communication Technologies (WCCCT)

This paper is an attempt at the detailed study of Cryptography algorithm. In resource constrained system, Elliptic Curve Cryptography is a promising alternative for public algorithms, because it provides similar level of security with proposed shorter keys than conventional integer based public key algorithm. ECC over binary field is taken up with special interest because the operation in binary filed...

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Elsevier (31)
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Journal of Chemical Crystallography (8)
Journal of Structural Chemistry (5)
Acta Crystallographica Section C (3)
Dyes and Pigments (3)
Bioelectrochemistry (2)
Dental Materials (2)
Journal of Chemical Sciences (2)
Journal of Solid State Electrochemistry (2)
Phytochemistry (2)
Tetrahedron (2)
Annals of Operations Research (1)
Bioorganic & Medicinal Chemistry Letters (1)
Ceramics International (1)
Chemical Engineering Journal (1)
Colloids and Surfaces A: Physicochemical and Engineering Aspects (1)
Computers & Industrial Engineering (1)
European Journal of Orthopaedic Surgery & Traumatology (1)
European Polymer Journal (1)
Geochimica et Cosmochimica Acta (1)
Indian Pediatrics (1)
International Journal of Infectious Diseases (1)
Journal of Applied Electrochemistry (1)
Journal of Crystal Growth (1)
Journal of Fluorine Chemistry (1)
Journal of Hazardous Materials (1)
Journal of Molecular Structure (1)
Journal of Natural Products (1)
Journal of Pharmaceutical and Biomedical Analysis (1)
Journal of the Brazilian Society of Mechanical Sciences and Engineering (1)
Materials Research Bulletin (1)
Materials Science-Poland (1)
Materials Science Poland (1)
Measurement (1)
Movement Disorders (1)
Neurocomputing (1)
Optik - International Journal for Light and Electron Optics (1)
Polyhedron (1)
Regenerative Engineering and Translational Medicine (1)
Silicon (1)
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy (1)
Structural Chemistry (1)
Transactions of the Indian Institute of Metals (1)
World Journal of Surgery (1)
World Neurosurgery (1)
X‐Ray Spectrometry (1)
2012 Third International Conference on Computing, Communication and Networking Technologies (ICCCNT'12) (1)
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