349 research outputs found
NOTICE!!! This person (known as Ashwin Kumar) plagiarized the text titled: "Using phenomenological research methods in qualitative health research"
No full textEDITORIAL NOTICE:
1. This publication has been removed due to detected plagiarism by the editorial.
2. If you have cited, you MUST UPDATE your reference with the following original article:
Wojnar, Danuta, and Kristen Swanson. “Phenomenology An Exploration”. Journal of holistic nursing : official journal of the American Holistic Nurses’ Association 25 (01 October 2007): 172-80; discussion 181. https://doi.org/10.1177/0898010106295172.
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3. Submitter's Profile Record (the thief, the plagiariser):
Name: Ashwin KumarURL: http://www.freewebs.com/ak2146Affiliation: University of Western Sydney, Australia.Country: AustraliaBio Statement:Dr. Ashwin Kumar,PO Box 571,Toongabbie,Sydney,Australia, NSW, 2146.Homepage: http://www.freewebs.com/ak2146Email: [email protected]
[email protected]: 0432-622-147Skype Internet Phone ID: ak2146
Dr. Ashwin Kumar (BA, MA (Distinction), PhD) is an academic researcher whose research interests and areas of expertise include: Complementary and alternative medicine (CAM), ageing and social gerontology, sociology, social anthropology, sociology of care, public health, health promotion, Indigenous health, migrant and refugee health, disability and chronic illness. Ashwin is the author of 8 books and numerous academic journal articles in the field of public health, health sociology and anthropology of health and illness. His books: The Lived Experience of Caring; The Lived Experience of Ageing; The Lived Experience of Using Complementary and Alternative Medicine; Doing Sociology; The Basics of Sociology; Plain English Writing; Research and Writing Skills and Writing Effective Essays are available at:
http://www.amazon.com/s/ref=ntt_athr_dp_sr_1?_encoding=UTF8&sort=relevancerank&search-alias=books&field-author=PhD.%20Ashwin%20Kumar
My homepage: http://www.freewebs.com/ak2146
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Asymptotically nonliner oscillatory shear: theory, modeling, measurements and applications of nonlinear elasticity to stimuli-responsive composites
Get PDFViscoelastic materials, such as crosslinked networks of synthetic and biological polymers, exhibit a nonlinear rheological response to mechanical deformation. Oscillatory shear is a popular deformation protocol for viscoelastic characterization, both linear and nonlinear, the latter referred to as large amplitude oscillatory shear (LAOS). However, the accompanying nonlinear material response in LAOS is challenging to interpret and requires non-trivial material descriptions. The goal of this thesis is to provide a new paradigm of nonlinear rheological characterization using oscillatory shear deformation as well as to demonstrate applications of nonlinear viscoelastic materials, involving stimuli responsive polymer-colloid composites.
A nonlinear viscoelastic response in LAOS is high dimensional, covering the entire range of the 2D Pipkin space of deformation amplitude and frequency. A low-dimensional language and framework is introduced for viscoelastic characterization using asymptotic material functions in oscillatory shear, referred to as medium amplitude oscillatory shear (MAOS). These material functions, four in number, emerge from an asymptotic expansion in deformation amplitude and depend only on the oscillatory frequency. They carry physically meaningful inter- and intra-cycle information, for example, softening/stiffening and thickening/thinning of the stress response. For the first time, experimental measurements are shown for all four asymptotic nonlinearities.
Parallel disk measurements in the MAOS regime require a correction for the apparent stress response. In this regime, the derivatives appearing in the general stress correction are constant over the range of interest, and this allows exact single-point corrections for all four asymptotic nonlinearities. Experimental measurements are presented for the asymptotically-nonlinear signals on an entangled polymer melt, using both parallel disk and cone fixtures. The corrected (amplified) parallel disk signals match the measurements with the cone.
Using a fourth order fluid expansion, universal frequency scaling and interrelations are derived for asymptotic nonlinearities in the terminal regime, defined by the limit of De<<1. Experimental measurements, consistent with such predictions, are presented for an entangled polymer melt in the terminal regime. Beyond the terminal regime, at higher frequencies, signs and magnitudes cannot be universally predicted, leaving these as free parameters that depend on the specifics of the material microstructure or constitutive model.
A library of expectations of signatures (or fingerprints) is developed for all four asymptotically-nonlinear material functions for seven nonlinear constitutive models. The fingerprints are different in magnitude, frequency-scaling, curve shapes and sign changes, and distinguish the models. They obey the terminal regime inter-relations and frequency scaling, and are driven by strain-rates at small De and strains at large De. Some constitutive models exhibit multiple sign changes at intermediate De and there may be no universal behavior of asymptotically-nonlinear fingerprints in this regime. Therefore, frequency-dependent signatures can be material-specific.
Frequency-dependent asymptotically-nonlinear fingerprints are presented for a strain stiffening transiently-crosslinked polymeric hydrogel of aqueous polyvinyl alcohol (PVA) cross-linked by sodium tetraborate (borax). A transient network model with strain-stiffening elements is developed, and this predicts the asymptotically-nonlinear signatures of the PVA-Borax system that no other model predicts. The quantitative agreement provides fit parameters that are related to molecular features and network architecture. In conclusion, asymptotically-nonlinear descriptions enable structure-rheology insight, constitutive model development, and model selection for soft materials.
As examples of nonlinear viscoelastic materials, polymer/colloid composites are developed with field responsive nonlinear elastic mechanical properties. A large mesh semi-flexible network of bovine fibrin is nonlinear elastic and stiffening, and serves as the scaffold. Methods are described to fabricate fibrin-colloid composites that preserve network integrity and nonlinear stiffening properties. The strain-stiffening fibrin network is combined with stimuli-responsive colloids that respond to temperature and magnetic field, resulting in field-controllable elastic stiffening of the network.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2018-08-01The student, Narayanan Ashwin Kumar Bharadwaj, accepted the attached license on 2016-06-15 at 11:57.The student, Narayanan Ashwin Kumar Bharadwaj, submitted this Dissertation for approval on 2016-06-15 at 12:05.This Dissertation was approved for publication on 2016-06-16 at 16:33.DSpace SAF Submission Ingestion Package generated from Vireo submission #9669 on 2016-11-10 at 12:24:30Made available in DSpace on 2016-11-10T18:39:08Z (GMT). No. of bitstreams: 3
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‘Idleness’ and a new approach to employment policy
Get PDFIt is 80 years since Beveridge took on what he called the ‘five giants’ of want, disease, ignorance, squalor and idleness. His report has shaped British politics and society ever since its publication. As part of a project to assess where we stand today, Ashwin Kumar and I were commissioned to explore ‘idleness’.1 Is it a problem today? And if so, what should be done about it
Low dimensional intrinsic material functions uniquely identify rheological constitutive models and infer material microstructure
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license.txt: 4082 bytes, checksum: 4d805d5496639ba3959b750fb2fc8438 (MD5)Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Seth Robbins ([email protected]) on 2013-02-03T19:19:08Z
Item is restricted until 2015-02-03T19:18:53ZRheological material functions are used to form our conceptual understanding of a
material response. For a nonlinear rheological response, the associated material functions
span a high-dimensional space. A theoretical framework is developed to outline lowdimensional
measures for describing asymptotic nonlinear responses in large-amplitude
oscillatory shear (LAOS). Nomenclature is introduced to provide physical interpretations
for these newly developed intrinsic measures under both shear strain-control (LAOStrain)
and shear stress-control (LAOStress) protocols.
Analytical solutions are surveyed for these intrinsic signatures of constitutive model
responses to imposed large-amplitude oscillatory shear strain (LAOStrain) and translated
into the language of intrinsic Chebyshev coefficients to allow for comparison and conceptual
interpretation. Considered constitutive models include that of a third order fluid,
corotational Maxwell model, Giesekus model, and other specific models for polymer melts,
rodlike polymer solutions, and emulsions. New analytical results are derived for two
transient nonlinear-elastic network models; finitely extensible nonlinear elastic (FENE) and
wormlike chain (WLC) models. A library of analytical intrinsic LAOStrain fingerprints is
thus generated. The intrinsic signatures for all these models are only a function of the
imposed frequency and a nonlinear parameter, if any. Interesting sign changes are observed
in the intrinsic signatures across constitutive models that help compare and contrast
between.
Under a defined deformation protocol, a numerical approach may be required to converge
on solutions to constitutive equations that may not have an analytical solution. A robust
numerical scheme is thus developed for quick and efficient extraction of intrinsic LAOStrain
nonlinearities for nonlinear constitutive models. The proposed numerical algorithm is used
to extract intrinsic LAOStrain material functions for the single mode pompom model and
the intrinsic signatures are compared for different combinations of the associated nonlinear
parameters. With slight modifications, the numerical scheme is applicable for any differential
or integral constitutive model. They are equally flexible to accommodate for increased
iii
nonlinearities in the system arising from modifications to constitutive equations in their
current form.
The utility of these measures is demonstrated by experimentally measuring the frequencydependent
intrinsic LAOStrain nonlinearities for a polymeric hydrogel (PVA-Borax).
Techniques for accurate extraction of the subdominant intrinsic measures are presented.
Physical interpretations are provided through the obtained intrinsic signatures of the PVABorax
system. The four measured intrinsic nonlinear fingerprints are compared with the
available analytical and numerical library of intrinsic fingerprints. The matching process
identifies a unique constitutive equation, fits the nonlinear model parameter, and implies
molecular- and micro-scale structure in the material.Item withdrawn by Mark Zulauf ([email protected]) on 2012-12-12T19:08:27Z
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Proteomic analysis of a compatible interaction between sugarcane and Sporisorium scitamineum
No full textSmut caused by Sporisorium scitamineum is one of the important diseases of sugarcane with global significance. Despite the intriguing nature of sugarcane - S. scitamineum interaction, several pertinent aspects remain unexplored. This study investigates the proteome level alterations occurring in the meristem of a S. scitamineum infected susceptible sugarcane cultivar at whip emergence stage. Differentially abundant proteins were identified by 2-DE coupled with MALDI-TOF/TOF-MS. Comprehensively, 53 sugarcane proteins identified were related to defense, stress, metabolism, protein folding, energy and cell division; in addition, a putative effector of S. scitamineum - chorismate mutase was identified. Transcript expression vis-à-vis the activity of phenylalanine ammonia lyase were relatively higher in the infected meristem. Abundance of seven candidate proteins in 2D gel profiles was in correlation with its corresponding transcript expression levels as validated by qRT-PCR. Furthermore, this study has opened up new perspectives on the interaction between sugarcane and S. scitamineum. This article is protected by copyright. All rights reserved
Modeling of D/C motor driven synthetic jet acutators for flow separation control
Get PDFThe objective of this research is to present a theoretical study of the compressibility effects on the performance of an electric D/C motor driven synthetic jet actuator for flow separation control. Hot wire anemometer experiments were conducted to validate the jet exit velocities predicted by the theoretical model. The optimal jet exit velocity required to achieve maximum flow reattachment at reasonable blowing momentum coefficients is predicted. A dynamic electro-acoustic model of the D/C motor driven actuator is developed to accurately predict its performance and efficiency. This model should help formulate a feedback optimal control strategy for real-time flow control using an array of actuators. This model is validated by comparing with hot wire anemometer experiments conducted under similar conditions. The effects of geometric parameters like the slot width, slot geometry, and cavity volume on the performance of the actuator are also tested using this model
Standoff Detection of Explosives at 1 m using Laser Induced Breakdown Spectroscopy
Get PDFWe report the ‘standoff detection’ of explosives at 1 m in laboratory conditions, for the first time in India, using Laser Induced Breakdown Spectroscopy combined with multivariate analysis. The spectra of a set of five secondary explosives were recorded at a distance of 1 m from the focusing as well as collection optics. The plasma characteristics viz., plasma temperature and electron density were estimated from Boltzmann statistics and Stark broadening respectively. Plasma temperature was estimated to be of the order of (10.9 ± 2.1) .103 K and electron density of (3.9 ± 0.5) .1016 cm-3. Using a ratiometric approach, C/H and H/O ratios showed a good correlation with the actual stoichiometric ratios and a partial identification success could be achieved. Finally employing principle component analysis, an excellent classification could be attained.
Comparison of aluminum and tunnel formwork for high-rise construction
No full textAbstract The growing demand for high-rise buildings in India has increased the need for faster and more efficient construction methods. Formwork systems play a key role in construction speed, quality, and cost. Monolithic construction, using advanced formwork like aluminum and tunnel formwork, has become popular due to its durability and efficiency. However, there is limited research comparing these systems in India, particularly in terms of cost, reusability, and selection criteria. This study fills that gap by comparing aluminum and tunnel formwork based on cost, efficiency, and key selection factors. The main objectives include: (1) identifying important factors in choosing formwork, (2) comparing costs, (3) evaluating cost per square meter, (4) analyzing reusability for cost-effectiveness, and (5) assessing time and cost impacts. The research uses a mix of literature review and case studies from high-rise projects in South and West India. Data was collected on shuttering costs, labor efficiency, reusability, and project timelines. Findings show that aluminum formwork is cost-effective for projects with fewer repetitions due to lower initial investment and labor costs. On the other hand, tunnel formwork is better for large-scale projects needing 450–500 repetitions because of its high reusability and faster construction speed, despite higher upfront costs. This research provides valuable insights for construction professionals, developers, and policymakers. By offering a data-driven comparison, it helps stakeholders choose the best formwork system based on project size, cost limits, and repetition needs. The findings can improve cost efficiency, project timelines, and sustainable construction, especially in developing countries like India
DEVELOPMENT AND EVALUATION OF CONTROLLED POROSITY OSMOTIC TABLETS OF CANDESARTAN CILEXETIL USING INCLUSION COMPLEX SYSTEM
No full textObjective: This study aims to enhance the solubility of BCS Class-II drug candesartan cilexetil (CC) by forming inclusion complexation with hydroxypropyl β-cyclodextrin (CDs) and develop a controlled-release osmotic tablet for 24-h release.
Methods: Solubility of Candesartan was enhanced using hydroxypropyl β-CDs at a molar ratio1:1 and analyzed for drug content and drug release profile. Fourier transform infrared interaction studies were conducted in drug complex and excipients. Core tablets were prepared with various ratios of osmogens (mannitol: Lactose monohydrate). Pre-compression studies were performed, and cellulose acetate solution containing sorbitol as pore-forming agent was used to coat the tablet cores, achieving 3% and 5% weight gain. The core tablets were subjected to post-compression tests assessing parameters such as thickness, weight variation, hardness, friability, and drug content, while the coated tablets underwent in vitro dissolution studies. Data obtained were subjected to drug release kinetics and formulation F6 was subjected to stability studies.
Results: Characterization confirmed good flow properties, mechanical stability, and uniform drug content. Formulation F6 coated with cellulose acetate, showed 97.33% drug release at 24 h, following zero-order kinetics. Stability studies indicated that F6 remained stable for 3 months, with no notable changes in attributes such as appearance, drug content, and dissolution profile.
Conclusion: This study successfully formulated a controlled drug delivery system for CC using controlled porosity osmotic delivery suggesting its potential for further development and clinical evaluation to enhance patient compliance and therapeutic efficacy
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