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Evaluation of Hepatoprotective Potential of Cassia tora Leaf Extract
Maity, Tapan Kumar,Mandal, Subhash C.,Mukherjee, Pulok K.,Saha, Kakali,Das, J.,Saha, B.P.,Pal, M. The Korean Society of Pharmacognosy 1997 Natural Product Sciences Vol.3 No.2
Methanolic extract of the leaves of Cassia tom was evaluated for its hepatoprotective potentials in rats by inducing hepatotoxicity with carbon tetrachloride. The extract at a dose of 400 mg/kg orally showed significant protective effect by lowering the serum levels of transaminase (SGOT and SGPT), bilirubin and alkaline phosphatase (ALP). The effects produced were comparable to that of a standard hepatoprotective agent.
Damage assessment of structures from changes in natural frequencies using genetic algorithm
Maity, Damodar,Tripathy, Rashmi Ranjan Techno-Press 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.19 No.1
A method is presented to detect and assess the structural damage from changes in natural frequencies using Genetic Algorithm (GA). Using the natural frequencies of the structure, it is possible to formulate the inverse problem in optimization terms and then to utilize a solution procedure employing GA to assess the damages. The technique has been applied to a cantilever beam and a plane frame, each one with different damage scenario to study the efficiency of the developed algorithm. A laboratory tested data has been used to verify the proposed algorithm. The study indicates the potentiality of the developed code to solve a wide range of inverse identification problems in a systematic way. The outcomes show that this method can detect and estimate the amount of damages with satisfactory precision.
Binary complexes of tertiary amines with phenylacetylene. Dispersion wins over electrostatics
Maity, Surajit,Patwari, G. Naresh,Karthikeyan, S.,Kim, Kwang S. Royal Society of Chemistry 2010 Physical chemistry chemical physics Vol.12 No.23
<P>The structures of the binary complexes between phenylacetylene and several tertiary amines <I>viz</I>., triethylamine, 1-ethylpiperidine, 1-ethylpiperazine, 1-azabicyclo[2.2.2]octane, and 1,4-diazabicyclo[2.2.2]octane were inferred using infrared-optical double resonance spectroscopy. The IR spectra in the acetylenic C–H stretching region clearly rule out the formation of electrostatic dominated C–H⋯N hydrogen bonded complexes. The IR spectra also point to the fact that all the five tertiary amines interact with the extended π electron density of the phenylacetylene moiety, leading to the formation of multidentate C–H⋯π hydrogen bonded complexes. Additionally a very weak electrostatic C–H⋯N hydrogen bond enhances the stability of the complex marginally. The multidentate C–H⋯π hydrogen bonded complexes are stabilized by a substantial contribution from the dispersion energy.</P> <P>Graphic Abstract</P><P>The fluorescence detected infrared spectra suggest that 1,4-diazabicyclo[2.2.2]octane interacts with phenylacetylene <I>via</I> dispersion dominated multiple C–H⋯π hydrogen bonds. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b918013c'> </P>
On Semirings which are Distributive Lattices of Rings
Maity, S.K. Department of Mathematics 2005 Kyungpook mathematical journal Vol.45 No.1
We introduce the notions of nilpotent element, quasi-regular element in a semiring which is a distributive lattice of rings. The concept of Jacobson radical is introduced for this kind of semirings.
Debarati Maity,Anagha S. Sabnis 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-
The incorporation of nanoparticles in various coatings has enhanced coating performances, thus attractingmany researchers to explore nanocomposite coatings. In order to synthesize a novel nanocompositecoating, dehydrated castor oil (DCO - biobased non-edible vegetable oil) was epoxidized with performicacid (HCOOOH) and cured with methyltetrahydrophthalic anhydride (MTHPA) in presence of tertiaryamine accelerator, 1-methyl imidazole (1-MI) and characterized by FTIR and 1H NMR. Simultaneously,zinc oxide (ZnO) nanoparticles were synthesized by mixing zinc acetate dihydrate (ZnAc2) with oxalicacid dihydrate (Ox2) by precipitation method and then modified organically with (3-glycidyloxypropyl)trimethoxysilane (GPTMS) by sol–gel method which was confirmed by DLS, FTIR, XRD, E-SEM, EDAX,TEM and XPS. These GPTMS-modified ZnO (G-ZnO) nanoparticles were incorporated into EDCO in variousconcentrations (0–3 wt%) and their mechanical, chemical, thermal and anticorrosion performances wereevaluated. All the coatings demonstrated outstanding mechanical and chemical properties (except foralkali resistance) whereas thermal resistance and anticorrosion properties were enhanced with increasein the loading of G-ZnO nanoparticles.
Subhankar Maity,Sandeep Tiwari,Prashant Vishnoi 한국섬유공학회 2023 Fibers and polymers Vol.24 No.9
Multifunctional and durable nano-coating of titanium dioxide (TiO2) on cotton and silk fabric surface has been achieved via sol–gel method in aqueous medium at room temperature. The nanosol is coated on fabric surface by pad-dry-cure method using 1% acrylic binder to achieve durable coating. The coated fabrics are characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray powder diffractometry (XRD), optical microscopy, and scanning electron microscopy (SEM). The performance of the coated fabrics against self-cleaning efficiency and UV protection is evaluated. The self-cleaning efficiency is assessed against the artificial stain of Schezwan chutney, coffee, Coca-Cola, and turmeric. Maximum stain removal efficiency is achieved with coffee stain with 81.25% and 96.63% for cotton and silk fabrics, respectively, after exposure to 20 h of sunlight. However, tensile strength and elongation of the coated fabrics decrease after the exposure to sunlight. The average size of the TiO2 particles formulated in the nanosol is found to be about 5 nm which is sufficient for scattering the UV radiation from the textile surface. The self-cleaning effect and UPF of nanosol-treated silk fabric are found to be better than that of cotton fabric. UPF of treated cotton and silk fabric is found to be 53.87 and 61.79, respectively.
Analysis of Pull-in-Voltage and Figure-of-Merit of Capacitive MEMS Switch
Santanu Maity,Rajesh Saha,Ngasepam Monica Devi,Chandan Tilak Bhunia 한국전기전자재료학회 2016 Transactions on Electrical and Electronic Material Vol.17 No.3
Theoretical and graphical analysis of pull-in-voltage and figure of merit for a fixed-fixed capacitive MicroElectromechanical Systems (MEMS) switch is presented in this paper. MEMS switch consists of a thin electrodecalled bridge suspended over a central line and both ends of the bridge are fixed at the ground planes of a coplanarwaveguide (CPW) structure. A thin layer of dielectric material is deposited between the bridge and centre conductorto avoid stiction and provide low impedance path between the electrodes. When an actuation voltage is appliedbetween the electrodes, the metal bridge acquires pull in effect as it crosses one third of distance between them. Inthis study, we describe behavior of pull-in voltage and figure of merit (or capacitance ratio) of capacitive MEMS switchfor five different dielectric materials. The effects of dielectric thicknesses are also considered to calculate the valuesof pull-in-voltage and capacitance ratio. This work shows that a reduced pull-in-voltage with increase in capacitanceratio can be achieved by using dielectric material of high dielectric constant above the central line of CPW.
Comparative study of torsional wave profiles through stratified media with fluted boundaries
Manisha Maity,Santimoy Kundu,Alka Kumari,Shishir Gupta 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.74 No.1
A mathematical analysis has been carried out for understanding the traversal attributes of torsional waves in a Voigt-type viscoelastic porous layer bounded with corrugated surfaces resting over a heterogeneous transversely isotropic gravitating semi-infinite medium. Both the media are assumed to be under the effect of initial stresses acting along horizontal directions. In the presumed geometry, continuous and periodic type of corrugation has been considered. The condensed form of dispersion relation has been obtained analytically with the aid of the Whittaker’s function and suitable boundary conditions. The influence of viscoelasticity, porosity, initial stresses, heterogeneity, gravity, undulation and position parameters on the phase and damped velocities has been illustrated graphically. In addition, relative examination investigating the impact of corrugated and planar bounded surfaces on the dispersion and damping characteristics is one of the important highlights of this study.