Browsing by Author "Sharma, M"

Now showing 1 - 7 of 7
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    Evidence of a Large Refrigerant Capacity in Nb-Modified La1.4Sr1.6Mn2−xNbxO7 (0.0 ≤ x ≤ 0.15) Layered Perovskites
    (2024-03) Kumar, A; Sharma, M; Vij, A; Kumari, K
    In this work, evidence of isothermal magnetic entropy change (∆SM) over a broad tempera ture region is presented in a series of La1.4Sr1.6Mn2−xNbxO7 Ruddlesden–Popper compounds with niobium modification (Nb) (0.0 ≤ x ≤ 0.15) at the manganese (Mn) site. The ceramic samples were ob tained through a solid-state sintering method in optimized conditions. All compounds predominantly possessed Ruddlesden–Popper phase while a few additional reflections were resolved in Nb-doped compounds which indicates the separation of structural phases. These peaks are assigned to a sepa rate layered perovskite and single perovskite with tetragonal symmetry and hexagonal symmetry, respectively. The microstructure of the pure sample reveals uniform grain morphology but in Nb doped specimens chiefly three types of grains were found. It was assumed that the inter-connected large particles were of R-P phase which is dominant in both parent and x = 0.05 compounds, while the hexagonal and polygonal morphology of grains in higher concentrations of dopants directly corroborates with the symmetry of single perovskite and additional layered perovskite phases, re spectively. The parent compound exhibits a single ∆SM curve, whereas all Nb-substituted samples display bifurcated ∆SM curves. This indicated two transition regions with multiple magnetic com ponents, attributed to distinct structural phases. The highest ∆SM values obtained for components corresponding to the R-P phase are 2.32 Jkg−1k −1 , 0.75 Jkg−1k −1 , 0.58 Jkg−1k −1 and 0.43 Jkg−1k −1 and for the second component located around room temperature are 0.0 Jkg−1k −1 , 0.2 Jkg−1k −1 , 0.28 Jkg−1k −1 and 0.35 Jkg−1k −1 for x = 0.0, 0.05, 0.10 and 0.15 compositions, respectively, at 2.5 T. Due to the collective participation of both components the ∆SM was expanded through a broad temperature range upon Nb doping.
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    Exact Solutions of Benjamin-Bona-Mahoney-Burgers Equation with Dual Power-Law Nonlinearity by Modified Exp-Function Method
    (2024) Sharma, M; Gupta, R
    In this work, the Benjamin-Bona-Mahoney-Burgers equation has been examined, which includes the dual power-law nonlinearity and diffraction term. By using the modified exp-function method, the exact solutions of the governing equation have been obtained. The resulting traveling wave solutions have been found to exhibit various characteristics, such as being dark solitons, periodic, and singular, depending on the values of certain constants. To further illustrate these solutions, 3D, 2D, and contour graphs have been displayed. To the best of our knowledge, this is the first time in literature that the dark solitons, periodic soliton, and singular soliton solutions of considered equations have been obtained by utilizing the modified exp-function method.
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    Exact Solutions of Benjamin-Bona-Mahoney-Burgers Equation with Dual Power-Law Nonlinearity by Modified Exp-Function Method
    (2023-04) Sharma, M; Gupta, RK
    In this work, the Benjamin-Bona-Mahoney-Burgers equation has been examined, which includes the dual power-law nonlinearity and diffraction term. By using the modified exp-function method, the exact solutions of the governing equation have been obtained. The resulting traveling wave solutions have been found to exhibit various characteristics, such as being dark solitons, periodic, and singular, depending on the values of certain constants. To further illustrate these solutions, 3D, 2D, and contour graphs have been displayed. To the best of our knowledge, this is the first time in literature that the dark solitons, periodic soliton, and singular soliton solutions of considered equations have been obtained by utilizing the modified exp-function method.
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    Exact Solutions of Benjamin-Bona-Mahoney-Burgers Equation with Dual Power-Law Nonlinearity by Modified Exp-Function Method
    (2024) Sharma, M; Gupta, R
    In this work, the Benjamin-Bona-Mahoney-Burgers equation has been examined, which includes the dual power-law nonlinearity and diffraction term. By using the modified exp-function method, the exact solutions of the governing equation have been obtained. The resulting traveling wave solutions have been found to exhibit various characteristics, such as being dark solitons, periodic, and singular, depending on the values of certain constants. To further illustrate these solutions, 3D, 2D, and contour graphs have been displayed. To the best of our knowledge, this is the first time in literature that the dark solitons, periodic soliton, and singular soliton solutions of considered equations have been obtained by utilizing the modified exp-function method.
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    Integrated analysis of transcriptomic and small RNA sequencing data provides miRNA candidates for engineering agronomically important seed traits in Brassica juncea
    (2023-11) Jain, R; Dhaka, N; Yadav, P; Sharma, M
    Brassica juncea L. is an important oilseed crop that yields edible oil and biofuel. Improving B. juncea seed traits is a primary breeding target, but these traits are genetically complex. MicroRNAs (miRNAs) regulate seed devel opment by modulating gene expression at the post-transcriptional or translational level and are excellent can didates for improving seed traits. However, the roles of miRNAs in B. juncea seed development are yet to be investigated. Here, we report small RNA profiling and miRNA identification from developing seeds of two contrasting varieties of B. juncea, Early Heera2 (EH2) and Pusa Jaikisan (PJK). We identified 326 miRNAs, including 127 known and 199 novel miRNAs, of which 103 exhibited inter-varietal differential expression. Integrating miRNAome and our previous transcriptome data identified 13,683 putative miRNA-target modules. Segregation of differentially expressed miRNAs into different groups based on variety-wise upregulation, fol lowed by comprehensive functional analysis of targets using pathway mapping, gene ontology, transcription factor mapping, and candidate gene analysis, revealed at least 11, 6, and 7 miRNAs as robust candidates for the regulation of seed size, seed coat color, and oil content, respectively. Further, co-localization with previously reported quantitative trait loci (QTL) proffered 29 and 15 miRNAs overlapping with seed weight and oil content QTLs, respectively. Our study is the first comprehensive report of miRNAome expression dynamics from developing seeds and provides candidate miRNAs and target genes for engineering seed traits in B. juncea.
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    Visible-Light-Driven Photocatalytic Degradation of Tetracycline Using Heterostructure Cu2O−TiO2 Nanotubes, Kinetics, and Toxicity Evaluation of Degraded Products on Cell Lines
    (2022-09) Sharma, M; Mandal, M; Pandey, S; Kumar, R
    This study first reports on the tetracycline photodegradation with thesynthesizedheterostructuredtitaniumoxidenanotubescoupledwithcuprous oxide photocatalyst. The large surface area andmore active sites onTiO2 nanotubes with a reduced band gap (coupling of Cu2O) provide faster photodegradation of tetracycline under visible light conditions. Cytotoxicity experiments performed on theRAW264.7 (mousemacro phage) andTHP-1 (humanmono cytes)cell lines of tetracycline and the photodegradedproductsof tetracyclineaswellasquenchingexperiments werealsoperformed.Theeffectsof different parameters likepH, photocatalyst loadingconcentration, cuprousoxide concentration, and tetracycline load on the photodegradation rate were investigated.Withanenhancedsurfaceareaof nanotubes anda reducedband gap of 2.58 eV, 1.5 g/L concentration of 10%C-TAC showed the highest efficiencyofvisible-light-drivenphotodegradation(∼100%photodegradationrate in60min)of tetracyclineatpH5,7, and9.Thephotodegradationefficiencyisnotdepleteduptofiveconsecutivebatchcycles. Quenchingexperiments confirmed that superoxide radicals andhydroxyl radicals are themost involved reactive species in the photodegradationoftetracycline,whilevalancebandelectronsaretheleastinvolvedreactivespecies.Thecytotoxicitypercentageof tetracyclineanditsdegradedproductsonRAW264.7(−0.932)aswellasTHP-1(-0.931)showedanegativecorrelationwiththe degradationpercentagewith a p-value of 0.01. The toxicity-free effluent of photodegradation suggests the applicationof the synthesizedphotocatalyst inwastewater treatment.