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Abhijit Sarkar

Bio: Abhijit Sarkar is an academic researcher from Indian Institutes of Technology. The author has contributed to research in topic(s): Polydiacetylenes & Conjugated system. The author has an hindex of 2, co-authored 6 publication(s) receiving 8 citation(s).
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Journal ArticleDOI
Ajinkya Baxy1, Abhijit Sarkar1Institutions (1)
20 Jan 2020
Abstract: The blades of propellers, fans, compressor and turbines can be modeled as curved beams. In general, for industrial application, finite element method is employed to determine the modal characterist...

3 citations

Book ChapterDOI
Abhijit Sarkar1, K. Nagendra Babu1, M. B. Kamath1, P. K. Khandelwal1  +2 moreInstitutions (1)
01 Jan 1991
Abstract: Recently, there has been hectic research activity in search of organic materials which show promising non-linear optical properties.1–5 Polydiacetylenes (PDAs) attracted special attention as a candidate material for third order non-linear optical properties (χ 3). This interest is due to the fact that PDAs show large third order non-linear optical susceptibility, with a fast response time. Additional supporting and important features of PDAs are that they can be obtained in single crystal form or LB films and it is possible to tune their optical properties through “Molecular and crystal engineering” through a variety of sidegroups.

2 citations

Journal ArticleDOI
Abstract: Two symmetrical diacetylene monomers containing thienyl moiety as the side groups, namely 1,4-bis(2'-thienyl)butadiyne and 1,4-bis(3'-thienyl)butadiyne, are reported which have been successfully polymerised electrochemically. They have also been polymerised chemically in solution using Lewis acid as initiator. The resulting polymers have been characterised by elemental analysis, infrared spectra, absorption spectra and by solid state NMR spectra. The polymers were found to have conjugated π-electron structure and both of them show high environmental stability. The properties of the polymers have been compared with that of poly(3-methylthiophene) which is a conventional and much studied conjugated polymer. The electrical conductivity of the polymers has also been investigated.

2 citations

Journal ArticleDOI
Abhijit Sarkar1, L. M. Bhole1Institutions (1)
Abstract: Though Basel II has been adopted by many emerging economies and guidelines on Market Discipline have been issued, question may be raised as to what extent market can act as an effective disciplinary force in these immature financial markets. This paper examines risk sensitivity of Indian banks' subordinated debt (SND) spreads (primary market) to ascertain whether debt investors act as a disciplinarian by discriminating across banks based on risk. A unique dataset of SND issues is compiled from issue documents filed with National Stock Exchange (NSE) at the time of issue/listing. The dataset includes issues listed with NSE as on 31st August 2007 and covers the period March 1999 to July 2007. Significant issue clustering in the highest rating-low risk categories is observed, both in terms of number and aggregate issue size. The pooled panel OLS results suggest sort of equi-spread clustering along the rating scale giving rise to a step-wise weakly monotonous increase in spread with enhanced issue risk. Dominance by government owned Public sector banks (PSB) in the SND market considerably weakens market discipline. The spread on PSB SND issues are generally lower relative to Private issues in the same rating scale. Even though more than half of the SNDs were issued over the last 28 months of the data period, no increased risk sensitivity of spreads is noticed. Issue ratings perform better as risk proxy relative to accounting measures of risks. Overall, market disciplinary role of the Indian SND market participants proves to be rather weak.

1 citations

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Journal ArticleDOI
Luminita Cianga1, Yusuf Yagci1Institutions (1)
Abstract: Two types of novel functionalized N-[4-(4′-hydroxyphenyloxycarbonyl)phenyl]maleimide and N-(4-{[2-(3-thienyl)acetyl]oxyphenyl}oxycarbonylphenyl)maleimide (MIThi) were synthesized starting from 4-maleimido benzoic acid. Photoinduced radical homopolymerization of MIThi and its copolymerization with styrene were performed at room temperature to give linear polymers containing pendant thienyl moieties using ω,ω-dimethoxy-ω-phenylacetophenone as an initiator. Copolymers' compositions and the equilibrium constant (K) for electron donor–acceptor complex formation suggest an alternating nature of the copolymerization. The monomer reactivity ratios and Alfrey–Price Q,e values were also determined. The thermal behavior of the new synthesized monomers and polymers was investigated by differential scanning calorimetry and thermogravimetric analysis. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 995–1004, 2002

22 citations

Journal ArticleDOI
Gianni Zotti1, B. Vercelli1, A. Berlin1, S. Destri1  +3 moreInstitutions (1)
Abstract: Electrochemical oxidation of bis-terthienyl-B (B = ethane, disulfide, diacetylene, acetylene, ethylene) has been investigated. Monomers without and with 3,3′′-dialkylsubstitution are regularly coupled to polymers alternating sexithiophene and B moieties. The corresponding terthienyl homopolymers have also been produced for comparison. The polymers obtained are characterized by cyclic voltammetry, EQCM, UV−vis, and FTIR spectroscopy, in situ ESR and in situ conductivity. The conductivities of p-doped polymers with ethane or disulfide bridges fall in a narrow range (1−5 × 10−2 S cm−1) and are practically the same as those of α,ω-dimethylsexithiophene (1 × 10−2 S cm−1), suggesting that conduction proceeds without the help of the links via a direct redox hopping between sexithiophene blocks of adjacent polymer chains. In the cases of diacetylene and acetylene, conduction changes from redox to bipolaron-type but only in the case of ethylene the conductivity jumps to high values (1−5 S cm−1) corresponding to th...

12 citations

Journal ArticleDOI
T. Manisekaran1, A. Sarkar2, L. P. Bhagwat2, S. S. Talwar2  +1 moreInstitutions (3)
Abstract: 1, 4-bis(1-naphthyl)-buta-1,3-diyne, C24H14, Mr , ' 302.38, monoclinic, P2 1/a, a '7.534(1), b ' 6.012(1), c ' 17.969(3)A, β' 101.1(1)˚, V ' 798.67 A, Dx ' 1.257g/cc, F(000) ' 316, λ.(Mok)α ' 0.71073 A T '300 K, final R and wR are 0.0389 and 0.0457 respectively using 1281 reflections taken in least squares calculations.

4 citations

Journal ArticleDOI
Arnab Sarkar1, L. M. Bhole1Institutions (1)
Abstract: The New Basel Capital Accord recognises that market discipline (Pillar III) has the potential to reinforce minimum capital standards (Pillar I) and the supervisory review process (Pillar II), and so promote safety and soundness in banks and financial systems. A number of studies in the context of developed financial system find support for this complementary relationship. However, one important question that can be raised in this context is the extent to which market can be relied upon to act as an effective disciplinary force in the immature financial markets dotting the developing economies, including India. This paper addresses this issue by examining the behaviour of the bank depositors in India. More specifically, it attempts to ascertain whether depositors respond to changes in bank fundamentals, both in terms of deposit held with a bank as well as interest received on it. Considering that a bank's ability to change interest rates (in addition to bank fundamentals) may also influence depositors' willingness to hold deposit with the concerned bank, a possibility arises that depositors' reaction and banks' response (in terms of interest rate payable on deposits) may be a jointly determined process. To account for this dynamic process, the Arellano-Bond dynamic panel generalised methods of moments (GMM) estimation method is employed. The results fail to find any significant evidence of discipline being exerted by the bank depositors. This highlights the limitations of relying on market forces as a disciplinary mechanism in cases of underdeveloped financial systems and the necessity to maintain a high capital standard as well as a vigilant and strong supervisory process.

3 citations

Ching Te Chang1, Yuh-Lin Yang1Institutions (1)
06 Jan 1998
Abstract: A compound of the formula: Ar.sub.1 --B--Ar.sub.2 wherein Ar 1 is unsubstituted or substituted phenyl, thienyl, furanyl, or pyrrolyl, in which each substituent of the substituted phenyl, substituted thienyl, substituted furanyl, and substituted pyrrolyl, independently, is aldehyde, acyl, ester, carboxyl, amido, nitrile, nitro, cyano, acetal, ketal, oxoalkyl, aminoalkyl, hydroxyalkyl, haloalkyl, iminoalkyl, acid halide, aminoalkylaminoalkyl, aminoalkylaminoalkylamino, hydroxyalkylaminoalkyl, or hydroxyalkylaminoalkylaminoalkyl; B is, --CH═CH--, or --C C--, in which R is H, alkyl, hydroxyl, alkoxy, ester, aldehyde, hydroxyalkyl, aminoalkyl, carboxyl, --CH(OR 1 ) 2 , or NR 2 R 3 , where each R 1 , independently, is H, alkyl, or acyl; and each of R 2 and R 3 , independently, is H, alkyl, hydroxyalkyl, or aminoalkyl; and Ar 2 is substituted phenyl, substituted thienyl, substituted furanyl, or substituted pyrrolyl, in which each substituent of the substituted phenyl, substituted thienyl, substituted furanyl, and substituted pyrrolyl, independently, is amido, nitrile, nitro, cyano, acetal, ketal, oxoalkyl, aminoalkyl, haloalkyl, iminoalkyl, acid halide, aminoalkylaminoalkyl, aminoalkylaminoalkylamino, hydroxyalkylaminoalkyl, or hydroxyalkylaminoalkylaminoalkyl; or a salt thereof. Also disclosed is a composition which contains a pharmaceutical acceptable carrier and an effective amount of a compound of the above formula.

2 citations

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Related Authors (2)
Lalita P. Bhagwat

5 papers, 13 citations

89% related
Satya S. Talwar

17 papers, 114 citations

88% related

Author's H-index: 2

No. of papers from the Author in previous years