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INNOVATION ALGORITHM IN ARMA PROCESS
Sreenivasan, M.,Sumathi, K. 한국전산응용수학회 1998 Journal of applied mathematics & informatics Vol.5 No.2
Most of the works in Time Series Analysis are based on the Auto Regressive Integrated Moving Average (ARIMA) models presented by Box and Jeckins(1976). If the data exhibits no ap-parent deviation from stationarity and if it has rapidly decreasing autocorrelation function then a suitable ARIMA(p,q) model is fit to the given data. Selection of the orders of p and q is one of the crucial steps in Time Series Analysis. Most of the methods to determine p and q are based on the autocorrelation function and partial autocor-relation function as suggested by Box and Jenkins (1976). many new techniques have emerged in the literature and it is found that most of them are over very little use in determining the orders of p and q when both of them are non-zero. The Durbin-Levinson algorithm and Innovation algorithm (Brockwell and Davis 1987) are used as recur-sive methods for computing best linear predictors in an ARMA(p,q)model. These algorithms are modified to yield an effective method for ARMA model identification so that the values of order p and q can be determined from them. The new method is developed and its validity and usefulness is illustrated by many theoretical examples. This method can also be applied to an real world data.
Photo-catalytic CO<sub>2</sub> reduction of C, N co-doped sodium titanate nanotube
( Sreenivasan Koliyat Parayil ),박승민,( Abdul Razzaq ),인수일 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
We report on the synthesis of C, N co-doped sodium titanate nanotube (C, N-TNT) by a hydrothermal method and calcination treatment. Na<sup>+</sup>- TNT was calcined to dope C and N from Urea. The presence of dopant ions are confirmed by X-ray Photoelectron Spectroscopy (XPS), Diffuse Reflectance Uv-vis spectroscopy (Uv-vis DRS) and Raman scattering. The photocatalytic effects of C, N-TNT are identified by methylene blue degradation and CO<sub>2</sub> reduction test under simulated solar light irradiation. The C,N-TNT10 (Urea/TiO<sub>2</sub> =10) showed highest conversion efficiency for photocatalytic dye degradation and CO<sub>2</sub> reduction.
Formation of biotinylated trititanate nanofibers (BioTNFs): potent optical probes for protein
Parayil, Sreenivasan Koliyat,Yoon, Minjoong Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.8
<P>The trititanate (H<SUB>2</SUB>Ti<SUB>3</SUB>O<SUB>7</SUB>) nanofibers (TNFs) prepared by a hydrothermal method, which are photocatalytically inactive, have been biotinylated by their reaction with <I>N</I>-hydroxysuccinimidobiotin through aminosilinization with 3-aminopropyl triethoxysilane (APTS). Surface morphology and covalent binding of the biotinylated TNFs (BioTNFs) are identified by XRD, SEM, TEM and FT-IR measurements. The BioTNFs are observed to form a charge transfer state as proved by XPS and the diffuse reflectance UV-visible absorption spectra, exhibiting stronger surface emission than free TNFs or TiO<SUB>2</SUB> quantum dots. The strong fluorescence emission of BioTNFs is found to be significantly quenched upon interaction with streptavidin due to photoinduced electron transfer from the charge transfer state of the BioTNFs to streptavidin. On the other hand, the fluorescence of Cy3 was observed to be enhanced upon binding Cy3-streptavidin with BioTNFs, indicating that BioTNFs are good immobilizers of protein. These results suggest that BioTNFs are potent optical probe materials for protein analysis.</P> <P>Graphic Abstract</P><P>The newly synthesized biotinylated trititanate nanofibers exhibit strong fluorescence emission sensitive to interaction with protein as potent optical protein-probes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm02475a'> </P>
Highly fluorescent peptide nanoribbon impregnated with Sn-porphyrin as a potent DNA sensor.
Parayil, Sreenivasan Koliyat,Lee, Jooran,Yoon, Minjoong Royal Society of Chemistry 2013 Photochemical & photobiological sciences Vol.12 No.5
<P>Highly fluorescent and thermo-stable peptide nanoribbons (PNRs) were fabricated by solvothermal self-assembly of a single peptide (D,D-diphenyl alanine peptides) with Sn-porphyrin (trans-dihydroxo[5,10,15,20-tetrakis(p-tolyl)porphyrinato] Sn(IV) (SnTTP(OH)2)). The structural characterization of the as-prepared nanoribbons was performed by transmitting electron microscopy (TEM), scanning electron microscopy (SEM) and atomic force microscopy (AFM), FT-IR and Raman spectroscopy, indicating that the lipophilic Sn-porphyrins are impregnated into the porous surface formed in the process of nanoribbon formation through intermolecular hydrogen bonding of the peptide main chains. Consequently the Sn-porphyrin-impregnated peptide nanoribbons (Sn-porphyrin-PNRs) exhibited typical UV-visible absorption spectrum of the monomer porphyrin with a red shifted Q-band, and their fluorescence quantum yield was observed to be enhanced compared to that of free Sn-porphyrin. Interestingly the fluorescence intensity and lifetimes of Sn-porphyrin-PNRs were selectively affected upon interaction with nucleotide base sequences of DNA while those of free Sn-porphyrins were not affected by binding with any of the DNA studied, indicating that DNA-induced changes in the fluorescence properties of Sn-porphyrin-PNRs are due to interaction between DNA and the PNR scaffold. These results imply that Sn-porphyrin-PNR will be useful as a potent fluorescent protein analogue and as a biocompatible DNA sensor.</P>
Heat transfer in a swirling fluidized bed with geldart type-D particles
Mohd Faizal Mohideen,Binod Sreenivasan,Shaharin Anwar Sulaiman,Vijay Raj Raghavan 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.7
A relatively new variant in fluidized bed technology, designated as the swirling fluidized bed (SFB), was investigated for its heat transfer characteristics when operating with Geldart type D particles. Unlike conventional fluidized beds, the SFB imparts secondary swirling motion to the bed to enhance lateral mixing. Despite its excellent hydrodynamics,its heat transfer characteristics have not been reported in the published literature. Hence, two different sizes of spherical PVC particles (2.61mm and 3.65mm) with the presence of a center body in the bed have been studied at different velocities of the fluidizing gas. The wall-to-bed heat transfer coefficients were measured by affixing a thin constantan foil heater on the bed wall. Thermocouples located at different heights on the foil show a decrease in the wall heat transfer coefficient with bed height. It was seen that only a discrete particle model which accounts for the conduction between the particle and the heat transfer surface and the gas-convective augmentation can adequately represent the mechanism of heat transfer in the swirling fluidized bed.