Birla Institute of Technology, Mesra

About: Birla Institute of Technology, Mesra is a education organization based out in Ranchi, India. It is known for research contribution in the topics: Computer science & Dielectric. The organization has 2801 authors who have published 4789 publications receiving 52426 citations. The organization is also known as: BIT.

Two-component coupled photovoltaic soliton pair in two-photon photorefractive materials under open circuit conditions

Abstract: The existence and nonlinear dynamics of two-component incoherently coupled composite solitons in two-photon photorefractive materials under open circuit conditions have been investigated. In the steady-state regime, these incoherently coupled solitons can propagate in bright–dark, bright–bright and dark–dark configurations. These photovoltaic soliton families can be established provided that the carrier beams share the same polarization and wavelength. The influence of the gating beam on the dynamics of stable solitons is discussed. Numerical simulations show that these solitons are stable for small perturbation on amplitude.

Mobility, Ecological risk and change in surface morphology during sequential chemical extraction of heavy metals in fly ash: A case study

Abstract: Patratu coal based thermal power plant of Jharkhand, India uses Gondwana coal and generates ≈ 0.259 metric tonnes of fly ash. Only 3% of fly ash produced is utilized and rest is dumped as slurry, in the slurry pond and in the low-lying areas of the nearby villages. This study was aimed to find the mobility of metals in the fly ash samples by sequential extraction as well as to evaluate the ecological risk of the fly ash. The transformation of surface morphology after each step of sequential extraction was also studied by SEM-EDX. The results revealed that 13% of Cd and 1% of Ni was water soluble 48% of Ni, 23% of Mn, and 7% of Cd were in exchangeable fraction. The proportion in carbonate bound fraction was Cd (32%), Cu (15%), Zn (12%), Mn (6%), and Ni (3%) of the total metal content. Whereas, the proportion in Fe–Mn oxide bound fraction was Fe (46%), Mn (14%), Zn (13%) and Ni (3%); in organic bound fraction was Pb (38%), Cu (33%), Zn (16%), Cr (15%), Ni (13%), Mn (7%), Fe (6%), and Cd (2%) and in residual fraction was Cr (85%), Pb (62%), Mn (50%), Zn (59%), Cu (44%), Fe (47%), and Cd (25%). Pollution load index of metals in fly ash was more than one. Ecological risk index was also above 600. These values signify high ecological and pollution risk of the fly ash due to presence of heavy metals. So, implementation of proper remediation techniques is necessary to reduce the ecological risk of the fly ash.

All-optical passive transistor.

Abstract: We show the possibility of developing an all-optical passive transistor in a simple and novel way. This could be done by copropagating two coaxial beams through a modified optical power filter. We show NOT logic and intensity modulation of the strong beam by the weak beam obtained with the analog.

Preparation and in vitro characterization of diltiazem hydrochloride loaded alginate microspheres

Abstract: The main objective of the present study was to improve bioavailability of diltiazem hydrochloride and decrease the frequency of dosage form administration by increasing the encapsulation efficiency of the drug, residence time of the dosage form at the site of absorption and sustained release of the drug from the delivery system. Alginate microspheres containing diltiazem hydrochloride were prepared by the emulsification-internal gelation method by using barium carbonate as a cross-linking agent with improved encapsulation efficiency. The effect of various factors (concentration of alginate and barium chloride) on the drug loading efficiency and in vitro release were investigated. Fourier transform infrared spectroscopy (FT-IR) analysis confirmed the absence of any drug polymer interaction. Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) pattern showed that the crystallinity of the drug was decreased in the dosage forms. The in vitro drug release mechanism was non-Fickian type controlled by swelling and relaxation of polymer. The stability studies of drug-loaded microspheres showed that the drug was stable at different storage conditions.