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Magneto-thermo-elastic waves in an infinite perfectly conducting elastic solid with energy dissipation

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Applied Mathematics and Mechanics(English Edition) 2009年第2期30卷 221-228页

作者： Payel Das mridula Kanoria Netaji Subhash Engineering College Technocity Police Para Panchpota Department of Applied Mathematics University of Calcutta

The generalized thermo-elasticity theory, i.e., Green and Naghdi （G-N） Ⅲ theory, with energy dissipation （TEWED） is employed in the study of time-harmonic plane wave propagation in an unbounded, perfectly electrically conducting elastic medium subject to primary uniform magnetic field. A more general dispersion equation with com- plex coefficients is obtained for coupled magneto-thermo-elastic wave solved in complex domain by using the Leguerre＇s method. It reveals that the coupled magneto-thermoelastic wave corresponds to modified dilatational and thermal wave propagation with finite speeds modified by finite thermal wave speeds, thermo-elastic coupling, thermal diffusivity, and the external magnetic field. Numerical results for a copper-like material are presented.

关键词： generalized thermoelasticity magneto-thermo-elastic wave energy dissipation

Effects of Main-chain and Chain-ends on the Organogelation of Stearoyl Appended Pendant Valine Based Polymers

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Chinese Journal of Polymer Science 2019年第9期37卷 903-911页

作者： mridula Nandi Swagata Pan Dipannita Ghosh Priyadarsi De Polymer Research Centre and Centre for Advanced Functional Materials Department of Chemical Sciences Indian Institute of Science Education and Research Kolkata

In this work, we investigated the effect of hydrophobic interactions between the polymeric backbone and chain-end groups on the self-assembly pathway of stearoyl appended side-chain valine（Val）-based poly（methacrylate/acrylate） homopolymers in different organic hydrocarbons. Gelation studies conducted revealed that while polymers with polyacrylate as backbone induces gelation in several organic hydrocarbons, polymers with polymethacrylate in the main-chain significantly hinders macroscopic gelation. Morphology of the organogels was analysed by field emission scanning electron microscopy（FESEM）, and mechanical strengths of the organogels were determined by rheological measurements. Reversible addition-fragmentation chain transfer（RAFT） polymerization chain transfer agents（CTA）s, [R1―S―C=（S）―S―R2] with different ―R1 and ―R2 groups, have been employed to study the effect of structural variation at the chain-end on macroscopic assembly mechanism. We found that the additional interactions between terminal groups via hydrogenbonding or π-π stacking interactions or both help to build up the self-assembly pathway and thereby produces mechanically stable organogels.

关键词： Organogelation Hydrophobic interactions Poly(methacrylate/acrylate) backbone RAFT polymerization Self-assembly

Practical realization of dual S arm antenna for beam steering applications

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第12期8卷 1901-1904页

作者： mehta Amit Institute of Advanced Telecommunications University of WalesSwansea SA2 8PP United Kingdom

A dual S shaped micro strip antenna with a realistic feed is proposed for generation of tilted beam radiation pattern pertaining for beam steering applications. To achieve this, four feeding points are located at a distance of 5.6 mm from the antenna centre. These feeding points when excited one by one generate four tilted beams in four different space quadrants, thus yielding a beam steerable antenna, Importantly, since the proposed antenna is symmetrical in the structure, all the four tilted beams have the same radiation pattern characteristics. A further enhancement of the antenna bandwidth is also achieved using 100-μn capacitive coupling between the feed and the antenna strip.

关键词： Beam steerable antenna S antenna. Switched beams

Multispectral harvesting rare-earth oxysulphide based highly efficient transparent luminescent solar concentrator

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Journal of Rare Earths 2022年第1期40卷 41-48页

作者： Vanjula Kataria Dalip Singh mehta Green Photonics Laboratory Department of PhysicsIndian Institute of Technology(IIT)DelhiHauz KhasDelhi110016India

Transparent luminescent solar concentrator(LSC)is extensively regarded as the most promising sunlight tapping device for its application in buildings integrated with photovoltaics(BIPV)or as solar window *** LSCs doped with organic dyes suffered from high reabsorption losses with no transparency;whereas,recently reported heavy metal-doped quantum dots avoided such losses but possessed the risk of high toxicity and low ambient ***,luminophores with massive spectral shifts and co rdial relationships with the enviro nment are very much *** this paper,we report the fabrication of PMMA based transparent LSC embedded with nanocrystals of environmental friendiness and multispectral harvesting gadolinium oxysulphide(Gd_(2)O_(2) S:Er,Yb)*** Gd_(2)O_(2) S:Er,Yb nanofluorophore absorbs various excitation wavelengths ranging from UV to NIR and emits in the visible region offering huge Stoke’s and anti-Stoke’s shift *** non-existent reabsorption losses and overlapping maxima of Gd_(2)O_(2) S:Er,Yb nanofluorophore generated photon flux with solar cells’responsivity enhance the efficiency characteristics of the LSC *** analysis of LSC as a function of varying nanofluorophore dispersion ratio and changing edge width optimizes the fabrication process and exhibits high power conversion efficiency of-6,93%and optical efficiency of-8.57%.The LSC slab demonstrates high photostability under irradiation for prolonged hours without any dip in the emission *** Gd_(2)O_(2) S:Er,Yb nanofluorophore diffused LSC waveguide offering spectral tunability,cost-reduction,efficiency enhancement,and high concentration factor whilst being sustainable for long term use makes it a fascinating transparent solar window.

关键词： Luminescent solar concentrator Gadolinium oxysulphide Stoke's shift Anti-Stoke's shift Efficiency enhancement Photostability

Analytical method for cell displacement defect quantum-dot cellular automata primitive

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Journal of Electronic Science and Technology 2023年第1期21卷 26-34页

作者： Vaishali Dhare Usha mehta Institute of Technology Nirma UniversityAhmedabad382481India

Quantum-dot cellular automata(QCA)is an emerging computational paradigm which can overcome scaling limitations of the existing complementary metal oxide semiconductor(CMOS)*** existence of defects cannot be ignored,considering the fabrication of QCA devices at the molecular level where it could alter the ***,defects in QCA devices need to be *** far,the simulation-based displacement defect analysis has been presented in the literature,which results in an increased demand in the corresponding mathematical *** this paper,the displacement defect analysis of the QCA main primitive,majority voter(MV),is presented and carried out both in simulation and mathematics,where the kink energy based mathematical model is *** results demonstrate that this model is valid for the displacement defect in QCA MV.

关键词： Displacement defect Kink energy Majority voter(MV) Quantum-dot cellular automata (QCA)

3D printed microfluidic devices:a review focused on four fundamental manufacturing approaches and implications on the field of healthcare

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Bio-Design and Manufacturing 2021年第2期4卷 311-343页

作者： Viraj mehta Subha N.Rath Regenerative Medicine and Stem Cells Laboratory Department of Biomedical EngineeringIndian Institute of Technology HyderabadKandiTelangana 502285India

In the last fewyears,3D printing has emerged as a promising alternative for the fabrication ofmicrofluidic devices,overcoming some of the limitations associated with conventional ***(SLA),extrusion-based technology,and inkjet 3D printing are three of the widely used 3D printing technologies owing to their accessibility and *** devices can be 3D printed by employing a manufacturing approach from four fundamental manufacturing approaches classified as(1)direct printing approach,(2)mold-based approach,(3)modular approach,and(4)hybrid *** evaluate the feasibility of 3D printing technologies for fabricating microfluidic devices,a review focused on 3D printing fundamental manufacturing approaches has been *** a broad spectrum of additive manufacturing materials,3D printed microfluidic devices have been implemented in various fields,including biological,chemical,and material ***,some crucial challenges are associated with the same,including low resolution,low optical transparency,cytotoxicity,high surface roughness,autofluorescence,non-compatibility with conventional sterilization methods,and low gas *** recent research progress in materials related to additive manufacturing has aided in overcoming some of these ***,we outline possible implications of 3D printed microfluidics on the various fields of healthcare such as in vitro disease modeling and organ modeling,novel drug development,personalized treatment for cancer,and cancer drug screening by discussing the current state and future outlook of 3D printed‘organs-on-chips,’and 3D printed‘tumor-on-chips.’We conclude the review by highlighting future research directions in this field.

关键词： 3D printing Additive manufacturing Microfluidics Lab-on-a-chip Organ-on-a-chip Tumor-on-a-chip

GeDiPNet: Online resource of curated gene-disease associations for polypharmacological targets discovery

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Genes & Diseases 2023年第3期10卷 647-649页

作者： Indra Kundu mridula Sharma Ram Shankar Barai Khushal Pokar Susan Idicula-Thomas Biomedical Informatics Centre Indian Council of Medical Research-National Institute for Research in Reproductive and Child HealthMumbai 400012India

There are numerous online databases dedicated to genes associated with human *** redundancy and lack of consistency of disease terms in these databases pose a significant impediment in high throughput data *** address this,we developed GeDiPNet by compiling data available on gene-disease associations from six popular open access sources namely DisGeNET,1 ClinGen.

关键词： databases online analysis.

Effect of NO_3^--N Enrichment on Seawater Stress Tolerance of Jerusalem Artichoke (Helianthus tuberosus)

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Pedosphere 2008年第1期18卷 113-123页

作者： S.K.mehta College of Resources and Environmental Sciences Nanjing Agricultural University

A hydroponic experiment with six treatments, i.e., 0% seawater （control）, 10% seawater, 25% seawater, 0% seawater ＋ N （7.5 mmol L-1 NaNO3）, 10% seawater ＋ N （7.5 mmol L-1 NaO3）, and 25% seawater ＋ N （7.5 mmol L-1 NaNO3）, was carried out to study the effect of nitrogen addition on the growth and physiological and biochemical characteristics of Jerusalem artichoke （Helianthus tuberosus） seedlings under seawater stress. The 10% seawater stress treatment had the least effect on plant growth while at 25% seawater growth was significantly inhibited. The malondialdehyde content and electrolyte leakage in leaves under 10% seawater were similar to those of the control, but significantly higher under the 25% seawater stress. The activities of superoxide dismutase, peroxidase and catalase in the leaves increased concomitantly with increasing seawater concentration and time. Proline and soluble-sugars in the leaves and Na^＋, K^＋, and Cl- contents in shoots and roots increased significantly with the concentration of seawater increasing. Nitrogen addition resulted in increasing fresh and dry weights of shoots and roots compared with seawater treatment without N. Nitrogen supplementation also significantly enhanced the activities of antioxidant enzymes in leaves. Addition of N to seawater enhanced the contents of proline and soluble-sugars in the leaves and K^＋ and total-N in the aerial parts and roots of H. tuberosus, but it resulted in declined concentrations of Na^＋ and Cl- in the aerial parts and roots. Nitrogen addition ameliorated the toxicity of seawater by improving the antioxidative enzymes, accumulating of proiine and soluble-sugars, and altering the distribution of inorganic ions in H. tuberosus.

关键词： Helianthus tuberosus ions distributions malondialdehyde nitrate seawater stress

Performance analysis and design of MIMO-OFDM system using concatenated forward error correction codes

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Journal of Central South University 2017年第6期24卷 1322-1343页

作者： Arun Agarwal Saurabh N.mehta PhD Scholar School of Electrical EngineeringDepartment of Information TechnologyAMET UniversityTamil NaduChennai 603112India Department of Electronics and Telecommunication Engineering Vidyalankar Institute of TechnologyMumbai-400037MaharashtraIndia

This work investigates the performance of various forward error correction codes, by which the MIMO-OFDM system is deployed. To ensure fair investigation, the performance of four modulations, namely, binary phase shift keying(BPSK), quadrature phase shift keying(QPSK), quadrature amplitude modulation(QAM)-16 and QAM-64 with four error correction codes(convolutional code(CC), Reed-Solomon code(RSC)+CC, low density parity check(LDPC)+CC, Turbo+CC) is studied under three channel models(additive white Guassian noise(AWGN), Rayleigh, Rician) and three different antenna configurations(2×2, 2×4, 4×4). The bit error rate(BER) and the peak signal to noise ratio(PSNR) are taken as the measures of performance. The binary data and the color image data are transmitted and the graphs are plotted for various modulations with different channels and error correction codes. Analysis on the performance measures confirm that the Turbo + CC code in 4×4 configurations exhibits better performance.

关键词： bit error rate (BER) convolutional code (CC) forward error correction peak signal to noise ratio (PSNR) Turbo code