170 research outputs found
A multiphase phase-field study of three-dimensional martensitic twinned microstructures at large strains
No full textA thermodynamically consistent multiphase phase-field approach for stress and temperature-induced martensitic phase transformation at the nanoscale and under large strains is developed. A total of N independent order parameters are considered for materials with N variants, where one of the order parameters describes A M transformations and the remaining N-1 independent order parameters describe the transformations between the variants. A non-contradictory gradient energy is used within the free energy of the system to account for the energies of the interfaces. In addition, a non-contradictory kinetic relationships for the rate of the order parameters versus thermodynamic driving forces is suggested. As a result, a system of consistent coupled Ginzburg-Landau equations for the order parameters are derived. The crystallographic solution for twins within twins is presented for the cubic to tetragonal transformations. A 3D complex twins within twins microstructure is simulated using the developed phase-field approach and a large-strain-based nonlinear finite element method. A comparative study between the crystallographic solution and the simulation result is presented.This is a pre-print of the article Basak, Anup, and Valery I. Levitas. "A multiphase phase-field study of three-dimensional martensitic twinned microstructures at large strains." arXiv preprint arXiv:2206.12576 (2022).
DOI: 10.48550/arXiv.2206.12576.
Copyright 2022 The Author(s).
Attribution 4.0 International (CC BY 4.0).
Posted with permission
Fluorescence Correlation Spectroscopy Study on the Effects of the Shape and Size of a Protein on Its Diffusion Inside a Crowded Environment
No full textFluorescence correlation spectroscopy (FCS)
has been commonly used to study the diffusional and
conformational fluctuations of labeled molecules at singlemolecule resolution. Here, we explored the applications of FCS inside a polyacrylamide gel to study the effects of molecular weight and molecular shape in a crowded environment. To understand the effect of molecular weight,we carried out FCS experiments with four model systems of different molecular weights in the presence of varying concentrations of acrylamide. The correlation curves were fit adequately using a model containing two diffusing components: one representing unhindered diffusion and one representing slow hindered diffusion in the gel phase. A large number of measurements carried out at different randomly chosen spots on a gel were used to determine the most probable diffusion time values using Gaussian distribution analysis. The variation of the
diffusivity with the molecular weight of the model systems could be represented well using the effective medium model. This model assumes a combination of hydrodynamic and steric effects on solute diffusivity. To study the effects of solute shape, FCS experiments were carried inside a urea gradient gel to probe the urea-induced unfolding transition of Alexa488Maleimide-labeled bovine serum albumin. We showed that the scaling behavior, relating the hydrodynamic radius and the number of amino acids, changes inside an acrylamide gel for both folded and unfolded proteins. We showed further that crowding induced by a polyacrylamide gel increases the resolution of measuring the difference in hydrodynamic radii between the unfolded and folded
states
Comparison of University Academics Job Factors: Satisfaction and Dissatisfaction
No full textThe aim of this paper is to compare the university academics job satisfaction factors and job dissatisfaction factors. This aim is achieved by identifying the factors that affect academics job satisfaction and dissatisfaction. The main results of this study were concluded by comparing the satisfaction factors and dissatisfaction factors for university academics from the existing literature. The novelty of this study is the use of a significant body of the existing literature has focused on the factors affecting university academics in terms of job satisfaction and job dissatisfaction to get the aim. The findings would help to know for university academic factors affect for satisfaction and dissatisfaction
A Framework on the Factors Affecting to Implement Maritime Education and Training System in Educational Institutions: A Review of the Literature
No full textA comparison of barriers and enhance factors on the adoption and use of ICT into teaching and learning for teachers
No full textReference Management Software: Comparative Analysis of RefWorks and Zotero
No full textThis paper presents a comparison of reference
management software between RefWorks and Zotero. The results
were drawn by comparing two software and the novelty of this paper
is the comparative analysis of software and it has shown that
ReftWorks can import more information from the Google Scholar for
the researchers. This finding could help to know researchers to use
the reference management software
A model using ICT adoption and training to improve the research productivity of academics
No full textSubmitted in fulfilment of the requirement of the Doctor of Technology degree in Information Technology, Durban University of Technology, Durban, South Africa, 2015.Research productivity is one of the core functions of a university and it plays a crucial role for a nation to develop and find its standing in our global world. This study examined the effect of ICT adoption and training on the research productivity of university academics. Much research has been done on using technology in research with a view to increase productivity. However, hardly any research could be found on the use of ICT combined with ICT training with a view to increase research productivity. This study addressed this gap in the literature. The study sought to design a model that can increase research productivity of academics while optimizing ICT adoption and training effects.
The study was conducted at four public universities in KwaZulu-Natal, South Africa, whilst the part of the study on ICT training was conducted at one of the four universities. This study was conducted both in the form of a survey of 103 university academics and in the form of experimental sessions, where the use of ICT (EndNote, NVivo, AMOS, SPSS, and Turnitin) with training was used for research, the use of ICT without training was used for research and, finally, a session where a manual system (without using research software/tools and training) was used for research.
The overall aim of the study was to investigate and design a model for the increase in research productivity of academics in universities after having adopted ICTs. The final results of the research revealed that the use of ICT tools (EndNote, NVivo, AMOS, SPSS, and Turnitin) with training increases research productivity as compared to using ICT tools without training, and/or using a manual system (without using research software/tools and training). A statistically proven model is recommended with a view to increase research productivity of academics.
Examining the inaccuracies of citations and referencing: A case of a computer science and engineering journal
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