Indian Institute of Technology Guwahati

About: Indian Institute of Technology Guwahati is a education organization based out in Guwahati, Assam, India. It is known for research contribution in the topics: Adsorption & Catalysis. The organization has 6933 authors who have published 17102 publications receiving 257351 citations.

Damage assessment of structures using hybrid neuro-genetic algorithm

Abstract: Techniques for detecting elemental level damage using the traditional methods receive the setback because of the difficulties in formulating the problems mathematically, specially in case of inverse problems. Artificial neural networks (ANN) have been proved to be an effective alternative for solving the inverse problems because of the pattern-matching capability. But there is no specific recommendation on suitable design of network for different structures and generally the parameters are selected by trial and error, which restricts the approach context dependent. A hybrid neuro-genetic algorithm is proposed in order to automate the design of neural network for different type of structures. The neural network is trained considering the frequency and strain as input parameter and the location and amount of damage as output parameter. The performance is demonstrated using two test problems: (i) clamped-free beam and (ii) plane frame. The outcomes of the results are quite encouraging and prove the robustness of the proposed damage assessment algorithm.

Operational Strategies and Comprehensive Evaluation of Menthol Based Deep Eutectic Solvent for the Extraction of Lower Alcohols from Aqueous Media

Abstract: Deep Eutectic Solvents (DESs) are gaining more interest as low-cost extraction media. Looking at its vast opportunity, the current work explores the extraction of alcohols namely ethanol, 1-propanol, and 1-butanol from the aqueous phase using two novel hydrophobic DES at 303.15 K and 1 atm. The preparation of DES possess a common HBA (Hydrogen Bond Acceptor) with a HBD (Hydrogen Bond Donor such as organic acids i.e., lauric acid and decanoic acid) at a certain proportion. Ratios of 2:1 and 1:1 were used for synthesizing menthol: lauric acid (DES-1) and menthol/decanoic acid (DES-2), respectively. The highest extraction efficiency of alcohols was observed in the presence of DES-1. Thereafter, atomistic molecular dynamics (MD) simulations have also been adopted to understand the extraction mechanism of alcohols from water using these DES. From MD simulations, the interaction energies, structural properties such as radial and special distribution functions, and dynamic properties such as self-diffusivity are...

Evidence of a new narrow resonance decaying to χc1γ in B→χc1γK

Abstract: We report measurements of $B\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c1}\ensuremath{\gamma}K$ and ${\ensuremath{\chi}}_{c2}\ensuremath{\gamma}K$ decays using $772\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. Evidence of a new resonance in the ${\ensuremath{\chi}}_{c1}\ensuremath{\gamma}$ final state is found with a statistical significance of $3.8\ensuremath{\sigma}$. This state has a mass of $3823.1\ifmmode\pm\else\textpm\fi{}1.8(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.7(\mathrm{syst})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$, a value that is consistent with theoretical expectations for the previously unseen $1^{3}D_{2}$ $c\overline{c}$ meson. We find no other narrow resonance and set upper limits on the branching fractions of the $X(3872)\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c1}\ensuremath{\gamma}$ and ${\ensuremath{\chi}}_{c2}\ensuremath{\gamma}$ decays.