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Mathematical modeling of atmospheric internal waves phenomenon and its solution by Elzaki Adomian decomposition method

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Journal of Ocean Engineering and Science 2022年第3期7卷 203-212页

作者： archana c.varsoliwala Twinkle R.Singh Applied Mathematics and Humanities Department Sardar Vallabhbhai National Institute of TechnologySurat395007GujaratIndia

This article involves the study of atmospheric internal waves phenomenon,also referred to as gravity *** phenomenon occurs inside the fluid,not on the *** model is based on a shallow fluid hypothesis represented by a system of nonlinear partial differential *** basic assumption of the shallow flow model is that the horizontal size is much larger than the vertical *** internal waves can be perfectly represented by this model as the waves are spread over a large horizontal *** we used the Elzaki Adomian Decomposition Method(EADM)to obtain the solution for the considered model along with its convergence *** Adomian decomposition method together with the Elzaki transform gives the solution in a convergent series without any linearization or *** are built between the results obtained by EADM and HAM to examine the accuracy of the proposed method.

关键词： Atmospheric internal waves Shallow-fluid equations System of nonlinear PDEs Elzaki Adomian decomposition method climate prediction

Preparation, characterization and luminescence behavior of some samarium complexes

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Rare Metals 2021年第9期40卷 2618-2626页

作者： archana chauhan Ritu Langyan Department of chemistry Kurukshetra UniversityKurukshetra 136119India

The synthesis of luminescent complexes of Sm(III) with the general formula [Sm(L)_(3)·(X)] was done in powder form. In the formula, L is 6-methyl-4-oxo-4 H-1-benzopyran-3-carboxaldehyde and X represents 2H_(2)O(c1), 1,10-phenanthroline(c2), 2,20-bipyridine(c3);bathophenanthroline(c4) and neocuproine(c5). The complexes were characterized by using various analytical and spectroscopic tools like elemental analysis, electrospray ionization mass spectrometry(ESI–MS+), Fourier transform infrared spectroscopy(FTIR), ultraviolet–visible(UV–Vis) spectroscopy, thermo-gravimetric analysis/differential thermal gravimetric analysis(TGA/DTG), field emission scanning electron microscopy(FESEM), powder X-ray diffraction(XRD), and photoluminescence(PL)studies. TGA/DTG showed high thermal stability of synthesized complexes. Powder XRD depicts that the average particle size lies in the nano-range. On monitoring at the excitation wavelength of 370 nm, the complexes display characteristic luminescence peaks of Sm(III) at ~564,~600 and ~647 nm assigned to^(4)G_(5/2)→^(6)H_(5/2),^(4)G_(5/2)→^(6)H_(7/2), and ^(4)G_(5/2)→6H9/2 transitions, respectively, with the most intense transition at ~600(orange emission) and~647 nm(bright red emission) in liquid and powder state, respectively. The investigations demonstrate that the synthesized novel complexes might be practically useful in electroluminescent devices, bio-assays, and liquid lasers due to their attractive photoluminescent properties.

关键词： Samarium complexes Luminescence Thermal analysis Quantum yield

Ion conduction in Superionic Glassy Electrolytes:An Overview

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Journal of Materials Science & Technology 2013年第3期29卷 193-208页

作者： Angesh chandra Alok Bhatt archana chandra Department of Applied Physics Shri Shankaracharya Institute of Prof.Manag.& Tech.Raipur 492015C.G.India Department of Applied Physics M.P Christian College of Engg.& Tech.Bhilai 490026C.G.India

The various theoretical and experimental models for ion conduction mechanism of fast ion conducting （FIc） glass electrolytes have been reported in the present review paper. Some characterization techniques of FIc glasses are presented. The experimental methods for determination of some ion transport parameters viz ionic conductivity （σ）, ionic mobility （μ）, mobile ion concentration （n）, ionic drift velocity （Vd）, ionic transference number （tion） and activation energies of FIc glasses are explained. The solid state battery fabrication by using some FIc glasses is also reported.

关键词： Ion conduction Glassy solid electrolyte Fast ion conducting (FIc) glass Superionic solid Relaxation phenomenon

SYNTHESIS, cHARAcTERIZATION AND ION TRANSPORT PROPERTIES OF HOT-PRESSED SOLID POLYMER ELEcTROLYTES (1-x) PEO:x KI

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chinese Journal of Polymer Science 2013年第2期31卷 302-308页

作者： Angesh chandra archana chandra K. Thakur Department of Applied Physics Shri Shankaracharya Institute of Prof. Manag. & Tech.Raipur 492015 C.G. India Department of Applied chemistry Raipur Institute of TechnologyRaipur 492101 C.G. India

Synthesis and ion transport properties of hot-pressed solid polymer electrolytes （SPEs）, （l-x） PEO： x KI, where x is the content of KI in wt%, are reported. A hot-press technique has been used for the formation of the polymeric membranes in place of the usual solution cast method. The composition （80 PEO：20 KI） was identified as the highest conducting polymer electrolyte on the basis of compositional dependent conductivity studies of PEO：KI films. A conductivity enhancement of more than two orders of magnitude from that of the pure PEO was achieved. Materials characterization and ion transport mechanism were explained by using various experimental techniques.

关键词： Solid polymer electrolyte Hot-press technique Ionic conductivity Ionic mobility XRD Polymeric battery.

Grain boundary effect on structural, optical, and electrical properties of sol-gel synthesized Fe-doped SnO_(2) nanoparticles

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chinese Physics B 2021年第4期30卷 555-564页

作者： archana V Lakshmi Mohan Kathirvel P Saravanakumar S Department of Sciences Amrita School of EngineeringCoimbatoreAmrita Vishwa VidyapeethamIndia Research and Development center Bharathiar UniversityCoimbatore-641046TamilnaduIndia GRD center for Materials Research Department of PhysicsP S G College of TechnologyCoimbatore-641004TamilnaduIndia Department of Physics N S S CollegePandalam-689501KeralaIndia

Tin oxide(SnO_(2)) and iron-doped tin oxide(Sn_(1-x)Fe_(x)O_(2),x=0.05 wt%,0.10 wt%) nanoparticles are synthesized by the simple sol-gel *** structural characterization using x-ray diffraction(XRD) confirms tetragonal rutile phases of the *** variations in lattice parameters and relative intensity with Fe-doping concentration validate the incorporation of iron into the *** compressive strain present in the lattice estimated by using peak profile analysis through using Williamson-Hall plot also exhibits the influence of grain boundary formation in the *** radiative recombination and quenching observed in optical characterization by using photoluminescence spectrum(PL) and the shift in the band gap estimated from UV-visible diffused reflectance spectrum corroborate the grain boundary *** spectrum and the morphological analysis by using a field emission scanning electron microscope(FESEM) also indicate the formation of grain *** compositional analysis by using energy dispersive x-ray spectrum(EDAX) confirms Fe in the SnO_(2) *** conductivity studies exhibit that the impendence increases with doping concentration increasing and the loss factor decreases at high frequencies with doping concentration increasing,which makes the Sn_(1-x)Fe_(x)O_(2) a potential candidate for device applications.

关键词： sol-gel compressive strain grain boundary Ac conductivity

Electrochemically functionalized graphene as an anti-corrosion reinforcement in cu matrix composite thin films

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International Journal of Minerals,Metallurgy and Materials 2021年第9期28卷 1525-1533页

作者： Akhya kumar Behera Amlan Das Sanjeev Das archana Mallik Electrometallurgy and corrosion Laboratory(Research) Department of Metallurgical and Materials EngineeringNational Institute of TechnologyRourkela 769008OdishaIndia Advanced Metal casting Laboratory Department of Metallurgical and Materials EngineeringNational Institute of TechnologyRaipur 492010ChhatisgarhIndia

cu-graphene(Gr)composite thin films were prepared by electrodeposition route using in-house synthesized Gr *** Gr sheets were synthesized by the electrochemical exfoliation route using 1 M HclO4 acid as *** Gr sheets were confirmed by X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),field-emission scanning electron microscopy(FESEM),and transmission electron microscopy(TEM).The(002)plane of Gr sheets was observed at 2θof 25.66°.The(002)plane confirmed the crystal structure of car-bon *** stretching vibration of c=c bond at a wavelength of 1577 cm^(−1) and other functional groups of carboxyl and epoxide groups were observed from *** confirmed the transparent structure of Gr *** prepared Gr sheets were used as reinforcement at con-centrations of 0.1 and 0.3 g/L with a copper matrix to synthesize the cu-Gr *** prepared composite thin films were characterized by XRD,SEM,and energy-dispersion spectrometry(EDS)for morphological and analytical *** presence of Gr sheets in cu-Gr com-posite was confirmed by EDS *** prepared cu-Gr nanocomposite thin film showed higher corrosion resistance compared with pure copper thin films in 3.5wt%Nacl,as confirmed by Tafel *** impedance spectroscopy complimented the above results and showed that 0.3 g/L composite film achieved the highest film resistance.

关键词： graphene nanocomposite electrodeposition copper

cryptic species composition and genetic diversity within Bemisia tabaci complex in soybean in India revealed by mtcOI DNA sequence

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Journal of Integrative Agriculture 2015年第9期14卷 1786-1795页

作者： Prasanna H c Kanakala S archana K Jyothsna P Varma R K Malathi V G Division of Vegetable Improvement Indian Institute of Vegetable Research Advanced centre for Plant Virology Division of Plant PathologyIndian Agricultural Research Institute Department of Plant Pathology Jawaharlal Nehru Krishi Vishwavidyalaya

Bemisia tabaci is a cryptic species complex, causing signiifcant loss on many agricultural y important crops worldwide. Knowledge on species composition and diversity within B. tabaci complex is critical for evolving sustainable pest management strategies. Here we investigate the whitelfy species complex in soybean in major soybean growing states of India. The mitochondrial cytochrome oxidase gene subunit-1 (mtcOI) based phylogenetic relationships established using Bayesian methods indicated the existence of three cryptic species namely Asia I, Asia II 1, and Asia II 7. Al the haplotypes detected in the study could be assigned to these three cryptic species fol owing the species demarcation criteria of 3.5%divergence threshold. Of these, Asia II 1 was found to be predominant with wide spread distribution across the surveyed regions from cool temperate zones to hot and humid tropical plains. On the contrary, cryptic species Asia II 7 showed localized distribu-tion. The Asia II 1 exhibited the highest haplotype diversity and Asia I showed high level of nucleotide diversity. There was a signiifcantly high genetic differentiation among these three cryptic species. The MEAM 1, a dreadful invasive species was not detected in the specimens tested in the current study. The diversity and distribution of three cryptic species is discussed in the light of current knowledge on distribution of whitelfy species in India and yel ow mosaic disease observed during sampling survey.

关键词： whitefly mitochondrial cytochrome oxidase gene subunit-1 AsiaⅠ AsiaⅡ 1 AsiaⅡ 7 begomovirus and yellow mosaic disease

Abscisic Acid Signal off the STARTing Block

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Molecular Plant 2011年第4期4卷 562-580页

作者： archana Joshi-Saha christiane Valon Jeffrey Leung Institut des Sciences du Vegetal Centre National de la Recherche Scientifique UPR2355 1 Avenue de la Terrasse Bat. 23 91198 Gif-sur-Yvette France

The year 2009 marked a real turnaround in our understanding of the mode of abscisic acid （ABA） action. Nearly 25 years had elapsed since the first biochemical detection of ABA-binding proteins in the plasmalemma of Vicia guard cells was reported. This recent--and laudable--achievement is owed largely to the discovery of the soluble ABA receptors whose major interacting proteins happen to be some of the most well-established components of earliest steps in ABA signaling. These soluble receptors, with the double name of PYRABAcTIN RESISTANcE （PYR） or REGULATORY cOMPONENT OF ABA REcEPTOR （RcAR）, are a family of Arabidopsis proteins of about 150-200 amino acids that share a conserved START domain. The ABA signal transduction circuitry under non-stress conditions is muted by the clade A protein phosphatases 2c （PP2c）（notably HAB1, ABI1, and ABI2）. During the initial steps of ABA signaling, the binding of the hormone to the receptor induces a conformational change in the latter that allows it to sequester the PP2cs. This excludes them from the negative regulation of the downstream ABA-activated kinases （OST1/SnRK2.6/SRK2E, SnRK2.2, and SnRK2.3）, thus unleashing the pathway by freeing them to phosphorylate downstream targets that now include several b-ZIP transcription factors, ion channels （SLAc1, KAT1）, and a NADPH oxidase （AtrbohF）. The discovery of this family of soluble receptors and the rich insight already gained from structural studies of their complexes with different isoforms of ABA, PP2c, and the synthetic agonist pyrabactin lay the foundation towards rational design of chemical switches that can bolster drought hardiness in plants.

关键词： Abiotic/environmental stress hormone biology signal transduction.

Differential fumigant and contact biotoxicities of biorational essential oil of Indian sweet basil and its active constituent against pulse beetle,callosobruchus chinensis

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Food Bioscience 2023年第1期51卷 598-607页

作者： K.Bincy archana V.Remesh Patole Reshma Prabhakar c.S.Vivek Babu Food Protectants&Infestation control(FPIc)Department CSIR-Central Food Technological Research Institute(CSIR-CFTRI)Mysuru570020KarnatakaIndia Academy of Scientific and Innovative Research(AcSIR) GhaziabadUttar Pradesh201002India

Pulses are important source of *** and effective storage of pulses till consumption is a challenging *** of pulses by invertebrate pests occurs at both pre and post-harvest *** based food protectants is an emerging area of grain *** study assessed the differential biotoxicities of Indian sweet basil(Ocimum basilicum essential oil)and its major chemical constituent estragole against the pulse beetle,callosobruchus ***-MS analysis of *** essential oil(EO)showed estragole(69.77%)and linalool(18.29%)as the main chemical *** EO and estragole exhibited a strong fumigant and contact toxicity giving 100%mortality against *** within an exposure period of 24 h in both without and with food ***50 of *** EO and estragole in presence of grain,were 83.33μL/L air and 185.66μL/L air and the LD50 values were 0.81μL/cm^(2) and 1.67μL/cm^(2) ***,SEM analysis of EO and estragole treated *** exhibited significant changes in topology of scales on ***-vitro acetylcholinesterase inhibition of ***,was moderately higher in the treatment with estragole(43.01%)than *** EO(29.03%).Besides,a significant percent of oviposition deterrence effect was noticed in EO and estragole treated ***,Indian Ocimum chemotype(***)and its active biological compound estragole showed effective potentiality as biorational insecticide for the control of pulse *** main aim of the work was to develop biorational alternative for chemical pesticides by exploring the potential insecticidal activity of *** essential oil as an ecofriendly approach.

关键词： O.basilicum Estragole callosobruchus chinensis Fumigation contact toxicity Stored product pests