27 research outputs found
Flow induced vibration of a circular cylinder with an attached elastic plate of high aspect ratio
No full textWe studied the flow induced transverse vibration of cylinder of reduced mass M_r = 2 with an attached flexible and elastic plate of high aspect ratio attached to the leeward side of cylinder and subjected to large scale flow-induced deformation at Re = 150. This problem statement was approached numerically using an in-house developed fluid solver based on curvilinear immersed boundary method strongly coupled with an open-source finite element based structural solver, using a partitioned approach. Further, the convergence of the fluid-structure solver was improved using dynamic under-relaxation. The coupled solver was also verified and validated using the method of manufactured solution and literature benchmarking cases. The vibration of cylinder with an attached elastic plate of aspect ratio of 20 was segregated into three categories as vortex induced vibration, transition and galloping. Lock-in in vortex induced vibration was observed when the non-dimensional natural frequency of elastic plate, cylinder undergoing vibration and vortex shedding nearly matched and came into resonance. The elastic plate at resonance was observed to be attaining very high modes of deformation leading to vortex to-vortex interaction with cylinder. The transverse displacement of the cylinder with an attached elastic plate of length twice the diameter of the cylinder was found to be nearly twice of an isolated cylinder for Ured = [5, 7]. Further, the lock-in regime in the presence of attached elastic plate was observed to be narrowed when compared to that of an isolated cylinder. Beyond this frequency, the cylinder was pushed into transition regime wherein the displacement of cylinder was nullified because of lack of vorticity interaction and out-of-phase deformation. Beyond U_r = 10, the cylinder was pushed into galloping regime wherein the cylinder was seen to be vibrating in frequency high than the reduced velocity. The elastic plate was restricted to the second mode of deformation and the transverse displacement of cylinder showed a linear increase with increase in U_r. The flow physics of the cylinder-plate system has been explained in detail using amplitude, frequency spectrum, force and phase characteristics. Modal analysis of deformation of attached elastic plate was performed to correlate it with agitation and subsidence of cylinder-plate system vibration
In Vitro Propagation of Ruta Chalepensis Through and Callus Culture
No full textPlant tissue culture is a field that that enables culturing of various plants and parts of plants usually treated under a nutrient medium and in highly sterile conditions. Out of them callus culture is one of the very interesting arenas of plant biotechnology that encompasses many pivotal benefits. The study focuses on such callus enrichment using different hormones that there by enhance its biological activities. The plant namely Ruta chalepensiswas chosen upon wherein the callus growth was noticed. Ruta chalepensis has multiple medicinal activities like anti-cancer, anti-ulcer, anti-diabetic and many more pharmacological properties that yields in treating and curing of illness. Ruta chalepensis the leaf and internode were taken for the study and to analyse which of those at what concentration of plant growth regulators showed a better callus induction. The MS medium as well as Various hormone concentrations was used for the study like auxin and cytokinin from 0.5mg to 2 mg (2,4 – D, NAA, IAA, IBA). Increased concentration of 2,4-D (1.0 mg/L) alone in the MS medium showed profused callus growth. Both the explants used such as leaf and Internode were also tested in the MS medium which was devoid of hormones/plant growth regulators which was treated as control for comparison. From the data obtained, MS medium supplemented with hormones showed better growth rate and callus induction when compared with that of MS medium without hormones/plant growth regulators. Among the plant growth regulators 2,4-D (1.0 mg/L) showed maximum callus initiation from both leaf and internode explants. Further work was carried out in single and combination of the plant growth regulators for callus proliferation and accumulation. Further analysis is being done to study the growth pattern on combination of hormones and fix the hormone concentrations for the mass propagation of callus from the explants
<i>cis</i>-Bromidobis(ethylene-1,2-diamine)(methylamine)cobalt(III) dibromide
No full textIn the title compound, [CoBr(CH5N)(C2H8N2)2]Br2, the cobalt(III) ion has a distorted octahedral coordination environment and is ligated by four N atoms in the equatorial plane, with an additional N atom and a Br− ion occupying the axial positions. In the crystal, the complex cation and the two counter-anions are linked via N—H...Br and C—H...Br hydrogen bonds, forming a supramolecular framework.</jats:p
Synthesis, Characterization, Photocatalytic Activities and Reusability of Eu-ZnO-Ag Nanoparticles using Sunlight/LEDs Illuminations
No full text<i>cis</i>-Bromidobis(1,2-diaminoethane-κ<sup>2</sup> <i>N</i>,<i>N</i>′)(ethylamine-κ<i>N</i>)cobalt(III) dibromide
No full textIn the title complex, [CoBr(C2H7N)(C2H8N2)2]Br2, the CoIII centre has a distorted octahedral coordination environment, and is surrounded by four N atoms in the equatorial plane, with an additional N atom and the Br atom occupying the axial positions. The complex is isostructural with the Cl compound for which the X-ray structure has also been reported [Anbalagan, Mahalakshmi & Ganeshraja (2011). J. Mol. Struct. 1005, 45–52]. In the crystal, the complex cation and the two counter-anions are linked via N—H...Br hydrogen bonds, forming a three-dimensional network.</jats:p
cis-Bromidobis(ethylene-1,2-diamine)(methylamine)cobalt(III) dibromide
No full textIn the title compound, [CoBr(CH5N)(C2H8N2)2]Br2, the cobalt(III) ion has a distorted octahedral coordination environment and is ligated by four N atoms in the equatorial plane, with an additional N atom and a Br− ion occupying the axial positions. In the crystal, the complex cation and the two counter-anions are linked via N—H...Br and C—H...Br hydrogen bonds, forming a supramolecular framework
Formulation And Characterization Of Root Extract Of Punica Granatum L. Containing Ointment Against Bacterial Pathogens
No full textThe potential antimicrobial activity and physicochemical characteristics of a ointment containing roots of Punica granatum L. were examined. The antimicrobial activity was carried out by performing agar well diffusion method. Antimicrobial efficacy of aqueous and ethylacetate solvent extract of roots of Punica granatum L was evaluated against E.coli and Staphylococcus aureus. The extracts which showed better results were chosen for formulation of ointment. We created an ointment by mixing 10% w/w aqueous extract of Punica granatum into an aqueous cream. The homogeneity, spreadability, extrudability, pH, viscosity, the ointment formulation were all evaluated. These results imply that a herbal ointment derived from Punica granatum is a potent topical formulation that combines contemporary pharmaceutical technology with traditional herbal medicine to treat skin infections
Detection of antimicrobial resistance genes in Diarrhoeagenic Escherichia coli from children less than 5 years
No full textcis-Bromido(n-butylamine-κN)bis(ethene-1,2-diamine-κ2N,N′)cobalt(III) dibromide
No full textIn the title compound, [CoBr(C2H8N2)2(C4H11N)]Br2, the cobalt(III) ion has a distorted octahedral coordination environment and is surrounded by four N atoms in the equatorial plane made up of three N atoms from the two ethylenediamine ligands and the remaining N from the n-butyl substituent, with the other N atom from the ethylenediamine ligand and the Br atom occupying the axial positions. In the crystal, the complex cation and the two counter-anions are linked via N—H...Br and C—H...Br hydrogen bonds, forming a three-dimensional network. The crystal studied was refined as a two-component inversion twin
