221 research outputs found
A Study on Plume Dispersion Characteristics of Two Discrete Plume Stacks for Negative Temperature Gradient Conditions
No full text© 2021, The Author(s). The dispersion of air pollutants emitted from industries has been studied ever since the dawn of industrialisation. The present work focuses on investigating the effect of negative atmospheric temperature gradient and the plume stack orientation of two individual equal-height stacks on the vertical rise and dispersion of the plume. The study carried out upon three-stack layout configurations namely inline, 45° and non-inline, separated by an inter-stack distance of 12 times the exit chimney diameter (12 D) and 22 times the exit chimney diameter (22 D) in each case over the two temperature gradients of −0.2 K/100 m and −0.5 K/100 m. The turbulence is modelled using realisable k-ε model, a model used in the FLUENT flow solver. In the case of the inline configuration, the upwind plume shields its downwind counterpart, which in turn allows for higher plume rise at a given temperature gradient. The plume oscillates more in the case of inline than 45° and non-inline cases. Also, for a temperature gradient of −0.5 K/100 m, the plumes oscillate violently in the vertical direction, mainly because, with the initial rise of the plume, cold air from higher altitudes moves down and forms a layer of lower temperature closer to the ground. The present study is important to highlight the plume dispersion characteristics under negative temperature gradient conditions
The remediation of wastewater containing 4-chlorophenol using integrated photocatalytic and biological treatment
No full textGoel, Mukesh Chovelon, Jean-Marc Ferronato, Corinne Bayard, Remy Sreekrishnan, T. R.In this work. the performance of integrated photocatalytic and biological treatment was studied for the degradation of 4-chlorophenol (MCP) present in wastewaters. Photocatalysis was used as a pre-treatment to biological degradation Pollutant removal efficiency was quantified using MCP removal and total organic carbon (TOC) removal Both photocatalytic as well as biological treatments were carried out in batch reactors, using TiO2 as the photocatalyst. The inoculum for biological experiments was obtained from paper mill effluent treatment plant and was developed through a process of selection and acclimatization. Effect of TiO2 concentration on the photocatalytic degradation of MCP was studied along with the effect of the duration of photochemical oxidation and glucose concentrations (0 g/L, 1 g/L and 2 g/L) on the biodegradation of MCP Integrated biological and photochemical degradation was found to be more effective in treating MCP, especially at higher concentrations (400 mg/L) An initial MCP concentration of 400 mg/L required 96 h for complete mineralization when treated with the process combination, whereas the treatment went on up to 264 h when biodegradation alone was employed (C) 2009 Elsevier B.V All rights reserved
Mental Health Literacies of Secondary School Teachers in Ontario: A Mixed Methods Study
No full textThe purpose of this mixed methods study is to investigate the mental health literacies (MHL) of secondary school teachers in Ontario – specifically, how they understand and address the mental health (MH) challenges of students. Over the past decade, the Ontario Ministry of Education (MOE) has encouraged the improvement of teachers’ MHL; this study, therefore, also investigates what opportunities teachers have access to and what barriers they face in supporting students’ MH.
A total of 211 secondary school teachers completed an online survey and 21 teachers participated in one-on-one interviews. Approximately three-quarters of the interviewed teachers showed little interest in advancing their knowledge and understanding; the ones who showed interest either had someone in their family, extended family or friends’ circle impacted with MH challenges or their school had a strong focus on MH. Based on the 211 survey respondents, survey results showed that 61.1% of teachers did not support students with MH challenges in the academic session 2017-2018. For the interviewees and survey respondents who participated in the study, the study also showed that teachers from Co-op Education, Special Education, and Guidance Departments were more aware of MH challenges and had more confidence in assisting students with MH challenges.
Analyses of the interview data suggest that motivation and exposure to opportunity are the two factors that could drive a teacher’s interest in learning about MH challenges. If a teacher with high intrinsic or extrinsic (administration driven) motivation is provided with many opportunities and/or resources, she or he will take interest and learn about MH of students. However, based on the survey results of survey respondents, only 24.6% of the teachers surveyed in this study worked in schools where principals were attempting to make teachers aware of MH resources.
This study has implications for the MOE and the school boards. It is imperative for the MOE to ensure that the school boards provide consistent and continuous professional development to improve educators’ MHL so that they are able to assist students with MH challenges.Ph.D
Tractable Reasoning In Knowledge Representation Systems
No full textThis dissertation addresses some problems raised by the well-known intractability of deductive reasoning in even moderately expressive knowledge representation systems. Starting from boolean constraint propagation (BCP), a previously known linear-time incomplete reasoner for clausal propositional theories, we develop fact propagation (FP) to deal with non-clausal theories, after motivating the need for such an extension. FP is specified using a confluent rewriting systems, for which we present an algorithm that has quadratic-time complexity in general, but is still linear-time for clausal theories. FP is the only known tractable extension of BCP to non-clausal theories; we prove that it performs strictly more inferences than CNF-BCP, a previously-proposed extension of BCP to non-clausal theories.
We generalize a refutation reasoner based on FP to a family of sound and tractable reasoners that are increasingly complete" for propositional theories. These can be used for anytime reasoning, i.e., they provide partial answers even if they are stopped prematurely, and the completeness" of the answer improves with the time used in computing it. A fixpoint construction based on FP gives an alternate characterization of the reasoners in this family, and is used to define a transformation of arbitrary theories into logically-equivalent vivid" theories | ones for which our FP algorithm ii is complete.
Our final contribution is to the description of tractable classes of reasoning problems. Based on FP, we develop a new property, called bounded intricacy, which is shared by a variety of tractable classes that were previously presented, for example, in the areas of propositional satisfiability, constraint satisfaction, and OR-databases. Although proving bounded intricacy for these classes requires domain-specific techniques (which are based on the original tractability proofs), bounded intricacy is one more tool available for showing that a family of problems arising in some application is tractable. As we demonstrate in the case of constraint satisfaction and disjunctive logic programs, bounded intricacy can also be used to uncover new tractable classes.Technical report DCS-TR-32
Study of structural and magnetic properties of cobalt ferrite nanoparticles sintered at different temperature
No full text
Optimization of Xylanase Production from Bacillus Sp. Pkd-9 under Solid State Fermentation, Partial Characterization and Application
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
Glucoamylase from Bacillus sp. CAM-21: Production, immobilization and its application in food/agro waste saccharification.
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
Studies on production and immobilization of mannanase from Bacillus sp.CAM-21 and preparation of β- Carotene nanoemulsions.
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
Glucoamylase Production From Bacillus sp. CAM-21 Under Solid State Fermentation (SSF) and its Partial Biochemical Characterization.
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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