A Fully Coupled Time-Domain BEM-FEM Method for the Prediction of Symmetric Hydroelastic Responses of Ships with Forward Speed

This paper presents a direct time-domain method for the prediction of symmetric hydroelastic responses of ships progressing with forward speed in small amplitude waves. A transient time-domain free surface Green function is used for the idealisation of the seakeeping problem using an Earth fixed coordinate system. Free surface ship hydrodynamics are idealised in the time domain by a Green function, and forward speed effects are idealised by a space-state model. Modal actions are accounted for by Timoshenko beam structural dynamics. Flexible fluid structure interaction (FFSI) coupling is enabled by a body boundary condition, and a direct integration Newmark-β scheme is used to obtain symmetric dynamic responses. The method is validated against available published numerical and experimental results. A parametric study for different container ship hull forms confirms that (i) forward speed effects should be taken under consideration as far as practically possible and (ii) hull flexibility effects accounting for hull shear deformation and rotary inertia are more notable for slender hull forms.Peer reviewe

2-(2′-Pyridyl)benzimidazole as a fluorescent probe for monitoring protein–surfactant interaction

The effectiveness of 2-(2′-pyridyl)benzimidazole (2PBI) as a fluorescent probe of macromolecular interactions is investigated, with the well-known human serum albumin–sodium dodecyl sulfate aggregates as the test system. The second fluorescence band of 2PBI, arising from a proton-transferred state at the surface of negatively charged sodium dodecyl sulfate micelles, is suppressed in the aggregates. The temporal features reflect the change in the relative population of the cationic and normal forms of the fluorophore. Thus, 2PBI is found to be a potentially good fluorophore for the study of complex systems like protein–surfactant aggregates.© Elsevie

Photoinduced electron transfer from chlorin p6 to methyl viologen in aqueous micelles

We report the effect of micellar encapsulation on the photoinduced electron transfer between chlorin p6 and methyl viologen. In aqueous solutions, these molecules form contact ion pairs and the fluorescence quenching observed is mainly static in nature. The quenching efficiency increases markedly in SDS micelles and the mechanism changes partially to dynamic quenching. However, fluorescence quenching of all kinds are suppressed in CTAB and Triton X-100 micelles. This is explained in the light of dissociation of the contact ion pairs and the electrostatic attraction of MV2+ by the headgroups of the surfactants.© Elsevie

Cerebrotendinous Xanthomatosis In A Family

A family consisting of a brother (11 years) and his twin sisters (13 years) with cerebrotendinous xanthomatosis is presented. The brother had bilateral achilles tendon xanthoma, low intelligence, poor memory with early cerebellar signs. The sisters had bilateral juvenile cataracts in addition to Achilles tendon xanthomas. The serum cholosterol level in all the three was within normal limits. The FNAC and histopathology of tendinous swelling showed touton giant cells and foam cells. A diagnosis of cerebro- tendinous xanthomatosis was made on the basis of Achilles tendon xanthomas, bilateral cataracts and normal serum cholesterol

Synthesis, aggregation and photoinduced electron transfer processes of cationic water-soluble 21-thia and 21-oxaporphyrins

The meso-pyridyl 21-thia- and 21-oxaporphyrins containing three pyridyl groups at the meso-positions have been methylated to obtain water-soluble porphyrins. The porphyrins are highly soluble in water and the water-soluble 21-thiaporphyrins exhibit aggregation behaviour above 10−4 M whereas the water-soluble 21-oxaporphyrins strongly aggregate at very low concentrations (10−7 M). The interaction of water-soluble ionic porphyrins with ionic surfactant in aqueous solutions has been studied as a function of surfactant concentration by means of absorption, fluorescence and resonance light scattering (RLS) techniques. It has been observed that, at the initial premicellar surfactant concentration, the oppositely charged surfactant induces aggregation and above cmc these aggregates dissociates into monomeric form and gets micellised. The self- and SDS-induced aggregation of these cationic porphyrins is found to depend on the number and position of the positive charge with respect to the porphyrin core. The micellar encapsulation technique is used to promote the photoinduced electron transfer between the porphyrins and neutral aromatic amines and it has been observed that the electron transfer rate becomes slowing down at the micellar surface compared to the bulk acetonitrile solution.© Elsevie

Abstracts of National Conference on Research and Developments in Material Processing, Modelling and Characterization 2020

This book presents the abstracts of the papers presented to the Online National Conference on Research and Developments in Material Processing, Modelling and Characterization 2020 (RDMPMC-2020) held on 26th and 27th August 2020 organized by the Department of Metallurgical and Materials Science in Association with the Department of Production and Industrial Engineering, National Institute of Technology Jamshedpur, Jharkhand, India. Conference Title: National Conference on Research and Developments in Material Processing, Modelling and Characterization 2020Conference Acronym: RDMPMC-2020Conference Date: 26–27 August 2020Conference Location: Online (Virtual Mode)Conference Organizer: Department of Metallurgical and Materials Engineering, National Institute of Technology JamshedpurCo-organizer: Department of Production and Industrial Engineering, National Institute of Technology Jamshedpur, Jharkhand, IndiaConference Sponsor: TEQIP-