118 research outputs found
Correction to: Growth and LC-PUFA production of the cold-adapted microalga Koliella antarctica in photobioreactors
No full textThe article “Growth and LC-PUFA production of the cold‐adapted microalga Koliella antarcticain photobioreactors”, written by Hirono Suzuki, Chris J. Hulatt, René H. Wijffels, and Viswanath Kiron was originally published electronically on the publisher’s internet portal (currently SpringerLink) on August 25, 2018 without open access.With the author(s)’ decision to opt for Open Choice the copyright of the article changed on October 17, 2018 to © The Author(s) 2018 and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made
A DEM study on microstructural behaviour of soluble granular materials subjected to chemo-mechanical loading
No full textExperimental works provide a mere understanding of the behaviour of granular material subjected to chemo-mechanical weathering, while the microstructural behaviour is of key importance due to the presence of coupling between the chemical and mechanical loading at the grain scale. The Discrete Element Method (DEM) has proven to be a viable tool in characterizing such microstructural behaviour of granular material in the recent past. In the present study, a DEM based numerical model is proposed to simulate chemo-mechanical degradation as observed in experiments. The aim is to understand how the dissolution rate alters during the dissolution of fully soluble reactive granular assembly like calcite under flowing acetic acid solution. The DEM contact parameters are calibrated for calcite granules, while the grain dissolution due to acid flow is mimicked by reducing particle size at a specific rate. The numerical results reveal that a gradual rise in dissolution rate or particle size reduction rate leads to a drop in lateral stress followed by a steady stress state condition. Furthermore, the study demonstrates that a reduction in dissolution rate leads to an increase in lateral stress. The microstructural analysis utilizing average particle velocity indicates that the increasing dissolution rate does not enhance particle rearrangement of the same order. Hence, more voids are created within the sample, and particle contact reduces, which promotes a reduction in lateral stress within the sample
Liquefaction Instability Analysis Using Extended Mohr-Coulomb Model Under Axisymmetric Conditions
No full textThe study presents a theoretical analysis of liquefaction instability in sands using Extended Mohr Coulomb model. Experimental observations reported in the literature have indicated a deviation of instability onset from the well-known criteria based on second order work. Hence, in the present study the liquefaction instability analysis has been posed as a bifurcation problem to study the instability onset. The analysis considers liquefaction as a solid-fluid instability. The conditions for instability, perturbed velocity and pore pressure fields for axisymmetric conditions are adopted from previous research. Extended Mohr-Coulomb material model based on nonassociative flow rule is utilized in the analysis as it is capable of predicting typical sand behaviour. The onset of instability predicted from the analysis is compared with the experimental observations. Emergence of instabilities are studied along with the evolution of distortional strains to understand the suitability of the obtained predictions. Bifurcation analysis predicted the onset of instability before the peak of effective stress path. It was consistent with the evolution of plastic component of distortional strains
UNDRAINED INSTABILITY RESPONSE OF GRANULAR MATERIAL IN FLEXIBLE BOUNDARY PLANE STRAIN CONDITIONS
No full textInstabilities in granular materials are marked by the development of heterogeneous deformations in "single-element" experiments. However, with the onset of instability, it becomes a boundary value problem. The present study uses a flexible boundary plane-strain (FB-PS) apparatus to characterise the instability behaviour under undrained conditions. Consolidated undrained tests are performed with two different boundary conditions, i.e., flexible and mixed boundaries, to study the influence of boundary rigidity. Flexible boundary signifies employing butyl rubber flexible membranes along all sides. While in mixed boundary conditions, additional rigidity is provided along the principal loading direction (σ1) using thin aluminium sheets with flexible butyl rubber membranes. The initiation of instability is delayed with relatively flexible boundary conditions
A quantitative data representation framework for structural and functional MR Imaging with application to prostate cancer detection
No full textProstate cancer (CaP) is currently the second leading cause of cancer-related deaths in the United States among men, but there is a paucity of non-invasive image-based information for CaP detection and staging in vivo. Studies have shown the utility of multi-protocol magnetic resonance imaging (MRI) to improve CaP detection accuracy by using both T2-weighted (T2w), dynamic contrast enhanced (DCE), and diffusion weighted (DWI) MRI information. In this thesis, we present methods for quantitative representation of structural and functional imaging data with the objective of building automated classifiers to improve CaP detection accuracy in vivo. In vivo disease presence was quantified via extraction of textural signatures from T2w MRI. Evaluation of these signatures showed that CaP appearance within each of the two dominant prostate regions (central gland, peripheral zone) is significantly different. A classifier trained on zone-specific features also yielded a higher detection accuracy compared to a simpler, monolithic combination of all the texture features. While a number of automated classifiers are available, classifier choice must account for limitations in dataset size and annotation (such as with in vivo prostate MRI). A comprehensive evaluation of different classifier schemes was undertaken for the specific problem of automated CaP detection via T2w MRI on a zonewise basis. It was found that simple classifiers yielded significantly improved CaP detection accuracies compared to complex classifiers. Fundamental differences must be overcome when constructing a unified quantitative representation of structural (T2w) and functional (DCE, DWI) MRI. We present a novel technique, referred to as consensus embedding, which constructs a lower dimensional representation (embedding) from a high dimensional feature space such that information (class-based or otherwise) is optimally preserved. Consensus embedding is shown to result in an improved representation of the data compared to alternative DR-based strategies in a variety of experimental domains. A unified quantitative representation of T2w, DCE, and DWI prostate MRI was constructed via the consensus embedding framework. This yielded an integrated classifier which was more accurate for CaP detection in vivo as compared to using structural and functional information individually, or using a naive combination of such differing types of information.Ph. D.Includes bibliographical referencesIncludes vitaby Satish Easwar Viswanat
Transient Analysis of Instability in Saturated Sand under Undrained Triaxial Loading Condition
No full textThe present study focuses on finite element analysis (FEM) of instability in saturated sands. The numerical simulation is performed under undrained conditions on the saturated triaxial specimen prepared by the moist tamping method. The differing behaviours of the granular material under steadystate and transient analysis are explored further. The steady-state analysis does not incorporate the flow of fluid in the pores of the soil sample. Whereas, the transient analysis considers the flow of pore fluid (solid-fluid diffusion) in the materials and allows the local drainage in the materials while globally remaining undrained. This study points towards the consideration of transient analysis in the simulation of saturated sand as it significantly influences the onset of instability. To simulate the nonhomogeneous sample, the density is varied along the height of the sample. The deviation in local responses for the nodes from each other is considered to identify the onset of instability. In transient analysis, it is found that the coupling mechanism between solid-fluid phases delayed the onset of instability and reduced the level of plastic deformation in the materials as compared to steady-state analysis
Status of Fermented Dairy Products in India Safety and Spoilage Aspects
No full textThis Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page
Prevalence of Staphylococcus Aureus in Indigenous Sweets and Challenge Studies.
No full textThis Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page
Prevalence of Salmonella Spp in Indigenous Sweets and Challenge Studies.
No full textThis Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page
Microbial quality of Dahi and Challenge Studies
No full textThis Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page
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