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Articles 24571 - 24600 of 24622
Full-Text Articles in Entire DC Network
Sediment Transport And Channel Morphology Dynamics Of Highly Regulated Alluvial Rivers - A Case Study Of The Lowermost Mississippi River., Sanjeev Joshi
LSU Doctoral Dissertations
The Mississippi River delta is facing severe land loss. An urgent need exists to examine sediment transport and channel morphology dynamics along this highly engineered alluvial river that has shaped and will continue to shape its delta. This dissertation research focuses on investigating channel morphology dynamics and sediment transport in the recent three decades along a 327-km reach (from about 492 to 167 km upstream from the river’s outlet in the Gulf of Mexico) of the Lowermost Mississippi River (LmMR). The specific objectives of this research were to: 1) analyze riverbed adjustment, i.e., channel-bed aggradation or channel erosion at seven …
Songs From Liquid Days By Philip Glass: A Performer's Guide, Jonathan Michael Ray
Songs From Liquid Days By Philip Glass: A Performer's Guide, Jonathan Michael Ray
LSU Doctoral Dissertations
The purpose of this research project is to provide the reader and the prospective performer with a comprehensive view of the song cycle Songs from Liquid Days by Philip Glass. Chapter 1 of this document gives a brief compositional history of the cycle. Chapter 2 provides biographical sketches of the composer and the cycle’s four poets: Paul Simon, Suzanne Vega, David Byrne, and Laurie Anderson. Chapter 3 discusses performance practice suggestions for Songs from Liquid Days, including commentary on tempo, style, ensemble choices, pacing, and analyses of both text and music. Chapter 4 compares the artistic interpretations of the 1986 …
Reduced Order Models For Beam-Wave Interaction In High Power Microwave Sources, Lokendra Singh Thakur
Reduced Order Models For Beam-Wave Interaction In High Power Microwave Sources, Lokendra Singh Thakur
LSU Doctoral Dissertations
We apply an asymptotic analysis to show that corrugated waveguides can be represented as cylindrical waveguides with smooth metamaterial coatings when the corrugtions are subwavelength. Here the metamaterial delivers an effective anisotropic surface impedance, effective dielectric constant, and imparts novel dispersive effects on signals traveling inside the waveguide. These properties arise from the subwavelength resonances of the metamaterial. For sufficiently deep corrugations, the waveguide exhibits backward wave propagation, which can be understood in the present context as a multi-scale phenomenon resulting from local resonances inside the subwavelength geometry. Our approach is well suited to numerical computation and we provide a …
Human Gut Microbiota And Obesity: How Is Gut Microbiota Associated With Obesity Improvement Induced By Bariatric Surgeries Or Low-Calorie Diet Treatment?, Rui Zhang
LSU Doctoral Dissertations
An increasing number of studies suggest that the complex microbial community of the human gut may have an important role in human health and disease conditions such as obesity and diabetes. However, the causal relationship among gut microbiota, obesity, weight loss, and the influence of bariatric surgery remains largely unknown. This study investigated the correlation between human gut microbiota and obesity via determining how gut microbiota is associated with obesity improvement induced by bariatric surgeries (BRS) and low-calorie diet (LCD) treatment. Specifically, we investigated the effects of various bariatric surgery (BRS) procedures and a low-calorie diet (LCD) treatment on the …
Exploring Social Indicators Of Situational Interest In Physical Education And Activity Classes: Integration Of Interest And Self-Determination Theories, Joseph Opiri Otundo
Exploring Social Indicators Of Situational Interest In Physical Education And Activity Classes: Integration Of Interest And Self-Determination Theories, Joseph Opiri Otundo
LSU Doctoral Dissertations
It is clearly documented that physically active lifestyles result in numerous health benefits. Unfortunately, a majority of individuals do not meet recommended physical activity (PA) guidelines. Physical education (PE) courses provide avenues for students to increase PA. Teachers and public health officials identify the importance of student motivation constructs such as interest in promoting PA behaviors and other healthy life habits. The purposes of this dissertation were to advance the measurement of situational interest by investigating social indicators derived from self-determination theory (SDT), and to test a theoretical model that integrates interest theory and SDT. Two quantitative studies were designed …
Manipulating Physical Properties Of Complex Materials By Processing, Mohammad Saghayezhian
Manipulating Physical Properties Of Complex Materials By Processing, Mohammad Saghayezhian
LSU Doctoral Dissertations
Transition metal oxides (TMOs) are a class of materials in which charge, orbital, spin and lattice strongly interact with each other. In the present thesis, a special attention is paid to the physical properties of TMOs as a function of processing. First, TMOs are studied as substrates, where the surface is of prime importance. Second, the thin films are fabricated and their physical properties are presented. The SrTiO3 (001) and (111) surfaces are weakly and strongly polar and the free energy of intact surfaces should diverge. It is shown that in TiO2 terminated SrTiO3(001) the top most layer shows rumpling …
Mining Social Media Data For Improved Understanding Of Disaster Resilience, Lei Zou
Mining Social Media Data For Improved Understanding Of Disaster Resilience, Lei Zou
LSU Doctoral Dissertations
Disaster resilience is the capacity of a community to ‘bounce back’ from disastrous events, by effecting resilience building activities through the four phases of emergency management – preparedness, response, recovery, and mitigation. However, data describing a community’s behaviors in each phase are difficult to access in traditional databases. Social media data provide an innovative data source to better understand communities’ responses and behaviors in each phase of emergency management during disasters, and thus could ultimately monitor and enhance disaster resilience. This study analyzes the spatial-temporal patterns of Twitter activities during Hurricane Sandy, which struck the northeastern United States on October …
A Narrative Of A Teacher's Perspective Of Over-Age Students Who Are Out-Of-Grade In The Middle School Classroom, Melissa J. Porter
A Narrative Of A Teacher's Perspective Of Over-Age Students Who Are Out-Of-Grade In The Middle School Classroom, Melissa J. Porter
LSU Doctoral Dissertations
This research sought to understand the impact on the middle school classroom environment of over-age students who are out-of-grade. A qualitative study utilizing a narrative lens examined the stories of the lived experiences of the teachers of these students; a social constructivism theoretical approach explored the teaching and best practices in their classrooms. These teachers provided an insight into the complexity of teaching and gave voice to managing a classroom where emotionally and physically mature students often pose a significant challenge to the classroom environment; moreover, their positive influence on the teaching space in which they inhabit also was explored …
Vibration Control In Wind Turbines For Multi Hazards, Milad Rezaee
Vibration Control In Wind Turbines For Multi Hazards, Milad Rezaee
LSU Doctoral Dissertations
The increasing demand for reliable and clean energy with a low running cost, has developed wind energy harvesting industry in a fast rate during the past two decades, and has led to wind farms’ spreading in various regions with larger and taller wind turbines. Consequently, it is more likely that wind turbines are installed or planned to be installed in areas with higher possibility of natural multihazard. Therefore, flexible modern wind turbines are subjected to severe dynamic environmental loads. Generated excessive vibrations in the wind turbine’s structure due to these loads can have detrimental effects on energy production, structural lifecycle …
On Braids, Branched Covers And Transverse Invariants, Jose Hector Ceniceros
On Braids, Branched Covers And Transverse Invariants, Jose Hector Ceniceros
LSU Doctoral Dissertations
In this work, we present a brief survey of knot theory supported by contact 3-manifolds. We focus on transverse knots and explore different ways of studying transverse knots. We define a new family of transverse invariants, this is accomplished by considering $n$-fold cyclic branched covers branched along a transverse knot and we then extend the definition of the BRAID invariant $t$ defined in cite{BVV} to the lift of the transverse knot. We call the new invariant the lift of the BRAID invariant and denote it by $t_n$. We then go on to show that $t_n$ satisfies a comultiplication formula and …
Decentralized Scheduling For Many-Task Applications In The Hybrid Cloud, Brian Lyle Peterson
Decentralized Scheduling For Many-Task Applications In The Hybrid Cloud, Brian Lyle Peterson
LSU Doctoral Dissertations
While Cloud Computing has transformed how we solve many computing tasks, some scientific and many-task applications are not efficiently executed on cloud resources. Decentralized scheduling, as studied in grid computing, can provide a scalable system to organize cloud resources and schedule a variety of work. By measuring simulations of two algorithms, the fully decentralized Organic Grid, and the partially decentralized Air Traffic Controller from IBM, we establish that decentralization is a workable approach, and that there are bottlenecks that can impact partially centralized algorithms. Through measurements in the cloud, we verify that our simulation approach is sound, and assess the …
The Effect Of Rule-Based Scaffoldings On Second Grade Students' Digital Storytelling, Xue Wen
The Effect Of Rule-Based Scaffoldings On Second Grade Students' Digital Storytelling, Xue Wen
LSU Doctoral Dissertations
Digital storytelling is a powerful method for revitalizing literacy instruction. Past research suggested that digital storytelling activities improve students’ writing skills through construction of various types of stories. However, little research has investigated in what ways educators can promote students’ interests and actual abilities to express narrative discourse in a digital format. Recent research indicated that the use of story grammars help students develop sophisticated stories. From this perspective, Labov’s story grammar emphasized two functions of good story structure: reference—the listeners (or readers) are told what happened, and evaluation—the speakers (or writers) reveal their attitude toward the events of the …
Improved Protein Characterizations Using Ionic Liquids: Page And Maldi-Ms, Punprabhashi Vidanapathirana
Improved Protein Characterizations Using Ionic Liquids: Page And Maldi-Ms, Punprabhashi Vidanapathirana
LSU Doctoral Dissertations
Protein separation by polyacrylamide gel electrophoresis (PAGE) and identification by matrix assisted laser desorption ionization-mass spectrometry (MALDI-MS) are primary tools of protein analysis. In these techniques, surfactants are used in protein sample preparation in order to enhance the protein solubility. Conventional surfactants have shown limitations in protein analysis due to the structural complexity of proteomes, resulting in low resolution. The research goal of this dissertation is to address some of these limitations by applying novel cationic ionic liquid surfactants (ILS), N-alkyl-4-methyl pyridinium bromide (CnPBr where n=4, 8, 11). The ILS would be suitable candidates to be used in PAGE protein …
Manifestations Of Symmetry In Polynomial Link Invariants, Kyle Istvan
Manifestations Of Symmetry In Polynomial Link Invariants, Kyle Istvan
LSU Doctoral Dissertations
The use and detection of symmetry is ubiquitous throughout modern mathematics. In the realm of low-dimensional topology, symmetry plays an increasingly significant role due to the fact that many of the modern invariants being developed are computationally expensive to calculate. If information is known about the symmetries of a link, this can be incorporated to greatly reduce the computation time. This manuscript will consider graphical techniques that are amenable to such methods. First, we discuss an obstruction to links being periodic, developed jointly with Dr. Khaled Qazaqzeh at Kuwait University, using a model developed by Caprau and Tipton. We will …
Tribological And Dynamical Study Of An Automotive Transmission System, Meng Li
Tribological And Dynamical Study Of An Automotive Transmission System, Meng Li
LSU Doctoral Dissertations
The transmission system is critical for automotive and heavy duty equipment due to its prominent role in the powertrain system, which is often challenged with degraded torque capacity and harsh dynamic response. Simulation-guided design can provide appropriate guidelines to resolve these problems with virtual analyses. In current study, the tribological and dynamical study of an automatic transmission is performed at two levels: a wet clutch and powertrain. In this dissertation, tribological study is performed for a wet clutch based on the thermohydrodynamic (THD) analysis that takes the following factors into account. • The groove effect (depth, area, and pattern) is …
Analytical Solutions And Multiscale Creep Analysis Of Functionally Graded Cylindrical Pressure Vessels, Jasem Amjad Ahmed
Analytical Solutions And Multiscale Creep Analysis Of Functionally Graded Cylindrical Pressure Vessels, Jasem Amjad Ahmed
LSU Doctoral Dissertations
This study deals with the time-dependent creep analysis of functionally graded thick-cylinders under various thermal and mechanical boundary conditions. Firstly, exact thermoelastic stress, and iterative creep solutions for a heat generating and rotating cylindrical vessel made of functionally graded thermal and mechanical properties are proposed. Equations of equilibrium, compatibility, stress-strain, and strain-displacement relations are solved to obtain closed-form initial stress and strain solutions. It is found that material gradient indices have significant influences on thermoelastic stress profiles. For creep analysis, Norton’s model is incorporated into rate forms of the above-mentioned equations to obtain time-dependent stress and strain results using an …
Sediment Transport And Slope Stability In The Northern Gulf Of Mexico, Jeffrey Blake Obelcz
Sediment Transport And Slope Stability In The Northern Gulf Of Mexico, Jeffrey Blake Obelcz
LSU Doctoral Dissertations
Sediment transport and slope stability are fundamental organizing agents of the geological record. These processes have been extensively studied along the northern margin of the Gulf of Mexico basin for both basic and applied purposes, but our knowledge of them is limited by the spatial and temporal sampling capabilities of traditional geologic oceanographic surveying tools such as coring, single-beam echosounders, and sidescan sonar. This dissertation seeks to update the state of knowledge regarding northern Gulf of Mexico sediment transport and slope stability from annual to millennial timescales, primarily using relatively high-resolution acoustic geophysical tools such as swath bathymetric echosounders and …
The Prevalence Of Twice Exceptional Students In The Gat Academic Programs: The Near Miss Phenomena, Lynne Ivicevic
The Prevalence Of Twice Exceptional Students In The Gat Academic Programs: The Near Miss Phenomena, Lynne Ivicevic
Theses: Doctorates and Masters
Twice exceptional (TE) students often experience barriers to their participation in gifted academic programs that contribute to their marginalised status amongst the school gifted population. The estimated prevalence of TE students in gifted programs worldwide varies according to the location, identification means and definition, with little agreement reached between researchers in the field. This research was made up of three interrelated studies. Firstly, six years of longitudinal quantitative cohort data from the Western Australian Department of Education (DoE) database on selected students for the GAT programs including GAT Academic programs and TE students to determine TE prevalence. Secondly, disability prevalence …
Feasibility Analysis Of Using Special Purpose Machines For Drilling-Related Operations, Ana Vafadarshamasbi
Feasibility Analysis Of Using Special Purpose Machines For Drilling-Related Operations, Ana Vafadarshamasbi
Theses: Doctorates and Masters
This work focuses on special purpose machine tools (SPMs), providing a modular platform for performing drilling-related operations. One of the main challenges in using SPMs is selecting the most appropriate machine tool among many alternatives. This thesis introduces a feasibility analysis procedure developed to support decision-making through the assessment of the strengths and limitations of SPMs. To achieve this, technical and economic feasibility analyses, a sensitivity analysis, and an optimisation model were developed and a case study was provided for each analysis. The results indicated that although technical feasibility analysis leads decision-makers to select a feasible machine tool, complementary analyses …
The Progress Of Anomie In Australia Between 2001 And 2011, Sharan Kraemer
The Progress Of Anomie In Australia Between 2001 And 2011, Sharan Kraemer
Theses: Doctorates and Masters
The fundamental social structures of Australia and the Western world in the modern era differ greatly from those of fin de siècle France and the post-Depression industrialised West; yet, similar individual human responses to stressors remain. The sociological insights of Émile Durkheim and Robert Merton presented in their theories of Anomie and Strain provide a guide to understanding this. The present research considered the confluence of pressures that flowed from the changes to social structures in Australia after the attacks of September 11th, 2001, in an environment in which people felt increasingly unsettled and insecure. It positioned the changes within …
Exploring The Impact Of Postgraduate Preservice Primary Science Education On Students’ Self-Efficacy, Christina Maria Norris
Exploring The Impact Of Postgraduate Preservice Primary Science Education On Students’ Self-Efficacy, Christina Maria Norris
Theses: Doctorates and Masters
The effectiveness of science teaching in primary school is dependent upon teachers’ self-efficacy to teach science. Low self-efficacy has been linked to avoidance of teaching primary science; therefore, preservice teacher self-efficacy requires fostering to have graduates keen to teach primary science. Through an embedded mixed method intrinsic-case study, this research explored the impact of postgraduate preservice primary science education on students’ self-efficacy. This research examined the postgraduate students’ self-efficacy as the lens to determine the effectiveness of the design and pedagogical instruction of the unit and its tutors. Data sources included the use of pre/post surveys encompassing the Science Teaching …
Editorial: Special Issue On Modeling In Endurance Sports, Chris Abbiss, Dietmar Saupe
Editorial: Special Issue On Modeling In Endurance Sports, Chris Abbiss, Dietmar Saupe
Research outputs 2014 to 2021
Analysing and predicting sports performance to optimise training and competition is a wide and complex field. To date, most methods heavily rely on the subjective experience of trainers and athletes. Nevertheless, objective mathematical methods and computer-based solutions have become increasingly popular over recent years and offer a wide range of research topics. This research is by nature interdisciplinary, involving sport and exercise science together with computational science and engineering.
An Investigation Into Spike-Based Neuromorphic Approaches For Artificial Olfactory Systems, Anup Vanarse, Adam Osseiran, Alexander Rassau
An Investigation Into Spike-Based Neuromorphic Approaches For Artificial Olfactory Systems, Anup Vanarse, Adam Osseiran, Alexander Rassau
Research outputs 2014 to 2021
The implementation of neuromorphic methods has delivered promising results for vision and auditory sensors. These methods focus on mimicking the neuro-biological architecture to generate and process spike-based information with minimal power consumption. With increasing interest in developing low-power and robust chemical sensors, the application of neuromorphic engineering concepts for electronic noses has provided an impetus for research focusing on improving these instruments. While conventional e-noses apply computationally expensive and power-consuming data-processing strategies, neuromorphic olfactory sensors implement the biological olfaction principles found in humans and insects to simplify the handling of multivariate sensory data by generating and processing spike-based information. Over …
Resistivity Profiles Of Perth Soil In Australia In Leak-Detection Test, Lopa M. Pandey, Sanjay K. Shukla, Daryoush Habibi
Resistivity Profiles Of Perth Soil In Australia In Leak-Detection Test, Lopa M. Pandey, Sanjay K. Shukla, Daryoush Habibi
Research outputs 2014 to 2021
The use of a suitable leak-detection system for the prevention and mitigation of pollution due to lining system failures is integral to the proper management of landfill facilities. This paper briefly summarises various methods of leak detection that are currently being practised. The details of a newly developed leak-detection technique are also presented. The tests were conducted to evaluate the performance of the new technique by use of controlled leakage. The resulting resistivity profiles for Perth soil in Australia were obtained at 10 min. This method is found to be effective in detecting and locating liner leakage issues within 30 …
Pso Algorithm For An Optimal Power Controller In A Microgrid, Waleed Al-Saedi, Stefan Lachowicz, Daryoush Habibi, Octavian Bass
Pso Algorithm For An Optimal Power Controller In A Microgrid, Waleed Al-Saedi, Stefan Lachowicz, Daryoush Habibi, Octavian Bass
Research outputs 2014 to 2021
This paper presents the Particle Swarm Optimization (PSO) algorithm to improve the quality of the power supply in a microgrid. This algorithm is proposed for a real-time selftuning method that used in a power controller for an inverter based Distributed Generation (DG) unit. In such system, the voltage and frequency are the main control objectives, particularly when the microgrid is islanded or during load change. In this work, the PSO algorithm is implemented to find the optimal controller parameters to satisfy the control objectives. The results show high performance of the applied PSO algorithm of regulating the microgrid voltage and …
Drilling Reconfigurable Machine Tool Selection And Process Parameters Optimization As A Function Of Product Demand, Ana Vafadar, Kevin Hayward, Majid Tolouei-Rad
Drilling Reconfigurable Machine Tool Selection And Process Parameters Optimization As A Function Of Product Demand, Ana Vafadar, Kevin Hayward, Majid Tolouei-Rad
Research outputs 2014 to 2021
Special purpose machines (SPMs) are customized machine tools that perform specific machining operations in a variety of production contexts, including drilling-related operations. This research investigates the effect of optimal process parameters and SPM configuration on the machine tool selection problem versus product demand changes. A review of previous studies suggests that the application of optimization in the feasibility analysis stage of machine tool selection has received less attention by researchers. In this study, a simulated model using genetic algorithm is proposed to find the optimal process parameters and machine tool configuration. During the decision-making phase of machine tool selection, unit …
The Psychometric Characteristics Of Two Versions Of A Mathematics Test In Middle School "A Comparative Study, Taghreed Hijazi, Naif Alsharif
The Psychometric Characteristics Of Two Versions Of A Mathematics Test In Middle School "A Comparative Study, Taghreed Hijazi, Naif Alsharif
Journal of Educational and Psychological Studies
The study aimed to investigate the psychometric properties of mathematics achievement test using two versions (paper-pencil and online). The two versions of three mathematics achievement tests were applied on a sample consisting of 958 students distributed to lst, 2nd and 3rd preparatory grades. Each test consisted of 30 items with four alternatives to measure students' problem solving skills and the scientific concepts. The sample of the study was randomly stratified and clustered selected. Item difficulty coefficients of the paper-pencil mathematics achievement test ranged between O.28-0.70, 0.38- 0.62, 048-070 for the lst, 2nd and 3rd preparatory grades respectively. There was between …
The Effect Of Teaching Science Using Mccarthy's' Model (4 Mat) On The 8th Grade Students' Retention Of Learning In Jordan, Abdelsalam M. Adili
The Effect Of Teaching Science Using Mccarthy's' Model (4 Mat) On The 8th Grade Students' Retention Of Learning In Jordan, Abdelsalam M. Adili
Journal of Educational and Psychological Studies
This study aimed at finding the effect of using McCarthy's' Model (4 MAT) on 8th grade students' retention of learning in Jordan. The subjects of the study consisted of 86 students from the eighth grade from one Zarqa city school in the second semester of the academic year 2014/2015. The sample was divided into two groups: the experimental group which was taught using 4 MAT model, and the control group which learned in the traditional way. To achieve the objectives of the study, a quasi-experimental approach was followed, and the researcher prepared a valid and reliable achievement test which aimed …
Longer-Term Impact Of Highand Low Temperature On Mortality: An International Study To Clarify Length Of Mortality Displacement, Ben Armstrong, Michelle Bell, Micheline De Sousa Zanotti Stagliorio Coelho, Yue Liang Leon Guo, Yuming Guo, Patrick J. Goodman, Masahiro Hashizume, Yasushi Honda, Ho Kim, Eric Lavigne, Paola Michelozzi, Paulo Hilario Nascimento Saldiva, Joel Schwartz, Matteo Scortichini, Francesco Sera, Aurelio Tobias, Shilu Tong, Chang Fu Wu, Antonella Zanobetti, Ariana Zeka, Antonio Gasparrini
Longer-Term Impact Of Highand Low Temperature On Mortality: An International Study To Clarify Length Of Mortality Displacement, Ben Armstrong, Michelle Bell, Micheline De Sousa Zanotti Stagliorio Coelho, Yue Liang Leon Guo, Yuming Guo, Patrick J. Goodman, Masahiro Hashizume, Yasushi Honda, Ho Kim, Eric Lavigne, Paola Michelozzi, Paulo Hilario Nascimento Saldiva, Joel Schwartz, Matteo Scortichini, Francesco Sera, Aurelio Tobias, Shilu Tong, Chang Fu Wu, Antonella Zanobetti, Ariana Zeka, Antonio Gasparrini
Articles
In many places, daily mortality has been shown to increase after days with particularly high or low temperatures, but such daily time-series studies cannot identify whether such increases reflect substantial life shortening or short-term displacement of deaths (harvesting).
Advancing Vibrational Spectroscopy For Cellular And Sub Cellular Analysis: Raman Spectroscopy As A Novel In Vitro Nanotoxicological Assessment Protocol, Esen Efeoglu
Doctoral
This work is designed to establish a ‘High content Nanotoxicological Screening method’ using in vitro Raman microspectroscopy. The undeniable increase of nanotechnology based products has brought challenges in terms of determining their toxicological properties. Considering the total time and cost of screening nanomaterials by conventional methods, the need for a rapid, label-free technique which will provide a wide range of information on multiple parameters is unquestionable. This study investigated the applicability of Raman microspectroscopy as a High Content Screening technique to clarify cell-nanoparticle interaction by determining the localisation of the nanoparticles and consequent effects in these localised areas in terms …