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  • Synchronization schemes for two dimensional discrete systems 
    AMBIKA, G.; Ambika, K. (IOP Publishing, 2006-10)
    In this study, we consider two models of two dimensional (2D) discrete systems subjected to three different types of coupling and analyse systematically the performance of each in realizing synchronized states. We find ...
  • Simultaneous and sequential synchronisation in arrays 
    AMBIKA, G.; Ambika, K. (EDP Sciences, 2007-01)
    We discuss the possibility of simultaneous and sequential synchronisation in vertical and horizontal arrays of unidirectionally coupled discrete systems. This is realized for the specific case of two dimensional Gumowski-Mira ...
  • Resonance phenomena in discrete systems with bichromatic input signal 
    Harikrishnan, K. P.; AMBIKA, G. (Springer Nature, 2008-02)
    We undertake a detailed numerical study of the twin phenomenon of stochastic and vibrational resonance in a discrete model system in the presence of bichromatic input signal. A two parameter cubic map is used as the model ...
  • Spins as qubits: Quantum information processing by nuclear magnetic resonance 
    Suter, D.; MAHESH, T. S. (AIP Publishing, 2008-02)
    Storing information in quantum mechanical degrees of freedom and processing it by unitary transformation promises a new class of computers that can efficiently solve problems for which no efficient classical algorithms are ...
  • NMR implementation of adiabatic SAT algorithm using strongly modulated pulses 
    Mitra, A.; MAHESH, T. S.; Kumar, A. (AIP Publishing, 2008-03)
    NMR implementation of adiabatic algorithms face severe problems in homonuclear spin systems since the qubit selective pulses are long and during this period, evolution under the Hamiltonian and decoherence cause errors. ...
  • Gelation of Covalently Edge-Modified Laponites in Aqueous Media. 1. Rheology and Nuclear Magnetic Resonance 
    Patil, S.P.; Mathew, R.; Ajithkumar, Thallaseril G.; Rajamohanan, Pattuparambil R.; MAHESH, T. S.; Kumaraswamy, Guruswamy (American Chemical Society, 2008-03)
    We describe the covalent modification of the edges of laponite with organic groups and the influence of this modification on gelation behavior. We compare three materials:  an unmodified laponite, a laponite edge modified ...
  • Template-free ZnS nanorod synthesis by microwave irradiation 
    Limaye, Mukta V.; Gokhale, Shubha; Acharya, S. A.; KULKARNI, SULABHA (IOP Publishing, 2008-10)
    We report template-free, microwave-irradiation-assisted growth of ZnS nanorods. Using this facile and high yield technique we could grow nanostructures of approximately 50–100 nm diameter and more than 1 µm in length. ...
  • The effect of concentration in the patterning of silica particles by the soft lithographic technique 
    Singh, Akanksha; Malek, Chantal Khan; KULKARNI, SULABHA (IOP Publishing, 2008-12)
    Soft lithography provides remarkable surface patterning techniques to organize colloidal particles for a wide variety of applications. In particular, micromolding in capillaries (MIMIC) has emerged as a patterning method ...
  • Genetic Programming Based Approach for Synchronization with Parameter Mismatches in EEG 
    Ahalpara, Dilip P.; Arora, Siddharth; SANTHANAM, M. S. (Springer Nature, 2009)
    Effects of parameter mismatches in synchronized time series are studied first for an analytical non-linear dynamical system (coupled logistic map, CLM) and then in a real system (Electroencephalograph (EEG) signals). The ...
  • Multifractal Analysis of Physiological Data: A Non-Subjective Approach 
    AMBIKA, G.; Harikrishnan, K.P.; Misra, R. (Springer, 2009)
    We have recently proposed an algorithmic scheme [22] for the non-subjective computation of correlation dimension from time series data. Here it is extended for the computation of generalized dimensions and the multifractal ...
  • Forbush decreases and turbulence levels at coronal mass ejection fronts 
    SUBRAMANIAN, PRASAD; Antia, H.M.; Dugad, S. R.; Goswami, U.D.; Gupta, S. K.; Hayashi, Y.; Ito, N.; Kawakami, S.; Kojima, H.; Mohanty, P.K.; Nayak, P.K.; Nonaka, T.; Oshima, A.; Sivaprasad, K.; Tanaka, H.; Tonwar, S.C. (EDP Sciences, 2009-02)
    Aims. We seek to estimate the average level of MHD turbulence near coronal mass ejection (CME) fronts as they propagate from the Sun to the Earth. Methods. We examined the cosmic ray data from the GRAPES-3 tracking muon ...
  • Efficient use of correlation entropy for analysing time series data 
    Harikrishnan, K. P.; Misra, R.; AMBIKA, G. (Indian Academy of Sciences, 2009-02)
    The correlation dimension D2 and correlation entropy K2 are both important quantifiers in nonlinear time series analysis. However, use of D2 has been more common compared to K2 as a discriminating measure. One reason for ...
  • Driving currents for fluxrope coronal mass ejection 
    SUBRAMANIAN, PRASAD; Vourlidas, Angelos (American Astronomical Society, 2009-03)
    We present a method for measuring electrical currents enclosed by flux rope structures that are ejected within solar coronal mass ejections (CMEs). Such currents are responsible for providing the Lorentz self-force that ...
  • The quintic interaction vertex in light-cone gravity 
    ANANTH, SUDARSHAN (Elsevier B.V., 2009-03)
    We consider pure gravity in light-cone gauge and derive the complete quintic interaction vertex. Up to quartic order, the Kawai–Lewellen–Tye (KLT) relations can be made manifest at the level of the Einstein–Hilbert Lagrangian. ...
  • Anticipatory synchronization with variable time delay and reset 
    AMBIKA, G.; Amritkar, R.E. (American Physical Society, 2009-05)
    A method to synchronize two chaotic systems with anticipation or lag, coupled in the drive response mode, is proposed. The coupling involves variable delay with three time scales. The method has the advantage that ...
  • High Coercivity of Oleic Acid Capped CoFe2O4 Nanoparticles at Room Temperature 
    Limaye, Mukta V.; SINGH, S.; Date, S.; KULKARNI, SULABHA (American Chemical Society, 2009-06)
    High coercivity (9.47 kOe) has been obtained for oleic acid capped chemically synthesized CoFe2O4 nanoparticles of crystallite size ∼20 nm. X-ray diffraction analysis confirms the formation of spinel phase in these ...
  • Gravity as the square of Yang‐Mills: implications for 𝒩 = 8 supergravity 
    ANANTH, SUDARSHAN (Wiley, 2009-08)
    The pure gravity Lagrangian can be written as the “square” of the pure Yang‐Mills Lagrangian to second order in coupling constants. This paper uses this form of the gravity Lagrangian as a starting point to arrive at a ...
  • Combined use of correlation dimension and entropy as discriminating measures for time series analysis 
    Harikrishnan, K. P.; Misra, R.; AMBIKA, G. (Elsevier B.V., 2009-10)
    We show that the combined use of correlation dimension (D2) and correlation entropy (K2) as discriminating measures can extract a more accurate information regarding the different types of noise present in a time series ...
  • Parametric internal waves in a compressible fluid 
    Das, K.S.; Morris, S. W.; BHATTACHARYAY, ARIJIT (AIP Publishing, 2009-11)
    We describe the effect of vibration on a confined volume of fluid which is density stratified due to its compressibility. We show that internal gravity-acoustic waves can be parametrically destabilized by the vibration. ...
  • Influence of biomass and gold salt concentration on nanoparticle synthesis by the tropical marine yeast Yarrowia lipolytica NCIM 3589 
    Pimprikar, P. S.; Joshi, S. S.; Kumar, A. R.; Zinjarde, S. S.; KULKARNI, SULABHA (Elsevier B.V., 2009-11)
    Cell-associated gold nanoparticles and nanoplates were produced when varying number of Yarrowia lipolytica cells were incubated with different concentrations of chloroauric acid (HAuCl4) at pH 4.5. With 109 cells ml−1 and ...