Open Access. Powered by Scholars. Published by Universities.®
Social and Behavioral Sciences Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Publication Year
- Publication
Articles 1 - 30 of 52
Full-Text Articles in Social and Behavioral Sciences
Investigating Sequence Patterns Of Collaborative Problem-Solving Behavior In The Online Collaborative Discussion Activity, Yafeng Zheng, Haogang Bao, Jun Shen, Xuesong Zhai
Investigating Sequence Patterns Of Collaborative Problem-Solving Behavior In The Online Collaborative Discussion Activity, Yafeng Zheng, Haogang Bao, Jun Shen, Xuesong Zhai
Faculty of Engineering and Information Sciences - Papers: Part B
Collaborative problem solving (CPS) is an influential human behavior affecting working performance and well-being. Previous studies examined CPS behavior from the perspective of either social or cognitive dimensions, which leave a research gap from the interactive perspective. In addition, the traditional sequence analysis method failed to combine time sequences and sub-problem sequences together while analyzing behavioral patterns in CPS. This study proposes a developed schema for the multidimensional analysis of CPS. A combination sequential analysis approach that comprises time sequences and sub-problem sequences is also employed to explore CPS patterns. A total of 191 students were recruited and randomly grouped …
Numerical Modelling Of Track Behavior Capturing Particle Breakage Under Dynamic Loading, Ngoc Trung Ngo, Buddhima Indraratna
Numerical Modelling Of Track Behavior Capturing Particle Breakage Under Dynamic Loading, Ngoc Trung Ngo, Buddhima Indraratna
Faculty of Engineering and Information Sciences - Papers: Part B
No abstract provided.
Fiber Element Simulation Of Interaction Behavior Of Local And Global Buckling In Axially Loaded Rectangular Concrete-Filled Steel Tubular Slender Columns Under Fire Exposure, Ghanim Mohammed Kamil, Qing Quan Liang, Muhammad N. S Hadi
Fiber Element Simulation Of Interaction Behavior Of Local And Global Buckling In Axially Loaded Rectangular Concrete-Filled Steel Tubular Slender Columns Under Fire Exposure, Ghanim Mohammed Kamil, Qing Quan Liang, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part B
Slender rectangular thin-walled concrete-filled steel tubular (CFST) columns in composite building structures exposed to fire may experience the interaction of local and global buckling. Numerical investigations on the interaction buckling responses of such columns under fire exposure have been rarely reported. This paper describes a fiber-based computational model for the prediction of the fire-resistance and interaction responses of local and global buckling of concentrically-loaded slender CFST columns made of rectangular sections exposed to fire. The thermal analysis is undertaken to calculate the distribution of temperatures in the column cross-section considering the effects of the air gap between concrete and steel, …
Behavior Of Eccentrically Loaded Double Circular Steel Tubular Short Columns Filled With Concrete, Mizen Ahmed, Qing Quan Liang, Vipulkumar I. Patel, Muhammad N. S Hadi
Behavior Of Eccentrically Loaded Double Circular Steel Tubular Short Columns Filled With Concrete, Mizen Ahmed, Qing Quan Liang, Vipulkumar I. Patel, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part B
Circular concrete-filled double steel tubular (CFDST) columns in high-rise building structures possess high ductility and strength performance owing to the concrete confinement exerted by the external and internal circular steel tubes. However, the behavior of circular CFDST short columns that are loaded eccentrically has not been investigated either experimentally or numerically. Particularly, numerical studies on the moment-curvature responses, strength envelopes, confinement effects and moment distributions in circular CFDST beam-columns have not been reported. In this paper, experimental and computational investigations into the structural responses of circular CFDST short columns loaded eccentrically are presented. Nineteen short circular CFDST columns with various …
Behavior Of Self-Compacting Concrete Columns Reinforced Longitudinally With Steel Tubes, Muhammad N. S Hadi, Faez Alhussainy, M Neaz Sheikh
Behavior Of Self-Compacting Concrete Columns Reinforced Longitudinally With Steel Tubes, Muhammad N. S Hadi, Faez Alhussainy, M Neaz Sheikh
Faculty of Engineering and Information Sciences - Papers: Part B
This study investigates the behavior of self-compacting concrete (SCC) specimens reinforced with small-diameter steel tubes in lieu of reinforcing bars. Twenty specimens were cast and tested. Four specimens were reinforced with normal steel bars (reference specimens) and the remaining 16 with steel tubes. All specimens contained steel helices with a pitch of either 50 mm or 75 mm. Deformed steel bars of 16-mm diameter were used in the four reference specimens as longitudinal reinforcement. Steel tubes of 33.7-mm outside diameter with 2-mm wall thickness (ST33.7) and steel tubes of 26.9-mm outside diameter with 2.6-mm wall thickness (ST26.9) were used as …
Garden-Related Environmental Behavior And Weed Management: An Australian Case Study, Ren Hu, Nicholas J. Gill
Garden-Related Environmental Behavior And Weed Management: An Australian Case Study, Ren Hu, Nicholas J. Gill
Faculty of Social Sciences - Papers (Archive)
This study aims to identify the key drivers of two garden-related environmental behaviors (GEBs): plant choice and bush-friendly behavior. This is important for biodiversity conservation threatened by weed invasion from domestic gardens. The effects of self-control, time pressure, and knowledge of weed-control initiatives were examined. A mail survey was sent to suburban residents living adjacent to native bushland in Wollongong, New South Wales. Regression analysis and structural equation modeling (SEM) were used. The path models for SEM were based on the theory of reasoned action. The results indicate that attitude, perceived harm, and knowledge of weed-control initiatives exert an effect …
Internal Energy Transfer In Dynamical Behavior Of Slightly Curved Shear Deformable Microplates, Mergen H. Ghayesh, Hamed Farokhi, Gursel Alici
Internal Energy Transfer In Dynamical Behavior Of Slightly Curved Shear Deformable Microplates, Mergen H. Ghayesh, Hamed Farokhi, Gursel Alici
Faculty of Engineering and Information Sciences - Papers: Part A
This paper investigates the internal energy transfer and modal interactions in the dynamical behavior of slightly curved microplates. Employing the third-order shear deformation theory, the microplate model is developed taking into account geometric nonlinearities as well as the modified couple stress theory; the initial curvature is modeled by an initial imperfection in the out-of-plane direction. The in-plane displacements and inertia are retained, and the coupled out-of-plane, rotational, and in-plane motion characteristics are analyzed. Specifically, continuous models are developed for kinetic and potential energies as well as damping and external works; these are balanced and reduced via Lagrange's equations along with …
Axial And Flexural Behavior Of Unreinforced And Frp Bar Reinforced Circular Concrete Filled Frp Tube Columns, Muhammad N. S Hadi, Qasim Khan, M Neaz Sheikh
Axial And Flexural Behavior Of Unreinforced And Frp Bar Reinforced Circular Concrete Filled Frp Tube Columns, Muhammad N. S Hadi, Qasim Khan, M Neaz Sheikh
Faculty of Engineering and Information Sciences - Papers: Part A
Fiber Reinforced Polymer (FRP) composites have emerged as a viable alternative of steel reinforcement due to higher ultimate tensile strength to weight ratio and corrosion resistance of FRP composites. Concrete Filled Fiber Reinforced Polymer Tube (CFFT) technique for new column construction has attracted significant research attention. This paper investigated the axial and flexural behavior of concrete filled Carbon FRP (CFRP) tube columns with and without CFRP bar and concrete filled Glass FRP (GFRP) tube columns with and without GFRP bar. The test results of 16 circular CFFT and four steel Reinforced Concrete (RC) specimens of 203-205 mm diameter and 800-812 …
Drained And Undrained Shear Behavior Of Compacted Coal Wash, Ana Heitor, Buddhima Indraratna, Chazath Kaliboullah, Cholachat Rujikiatkamjorn, Geoffrey Mcintosh
Drained And Undrained Shear Behavior Of Compacted Coal Wash, Ana Heitor, Buddhima Indraratna, Chazath Kaliboullah, Cholachat Rujikiatkamjorn, Geoffrey Mcintosh
Faculty of Engineering and Information Sciences - Papers: Part A
Coal wash is a granular waste material that is readily available in the vicinity of coal mining operations. While its potential use in structural fills has been recognized in the past, the effects of particle breakage on the geomechanical performance of the material have not been thoroughly investigated. In this paper, an experimental study on a selected coal wash is undertaken to characterize the influence of compaction and particle breakage on its corresponding stress-strain behavior. Particular emphasis is given to the role of compaction energy level and associated breakage incurred during compaction on the drained and undrained shearing behavior. The …
Correlation Between Zn-Rich Phase And Corrosion/Oxidation Behavior Of Sn-8zn-3bi Alloy, Xin Zhang, Chong Li, Zhiming Gao, Yongchang Liu, Zongqing Ma, Liming Yu, Hui Jun Li
Correlation Between Zn-Rich Phase And Corrosion/Oxidation Behavior Of Sn-8zn-3bi Alloy, Xin Zhang, Chong Li, Zhiming Gao, Yongchang Liu, Zongqing Ma, Liming Yu, Hui Jun Li
Faculty of Engineering and Information Sciences - Papers: Part A
The microstructure of Sn-8Zn-3Bi alloy was refined by increasing the solidification rate and the correlation between Zn-rich phase and the corrosion/oxidation behavior of the alloy was investigated. The Zn-rich phase transforms from coarse flakes to fine needles dispersed in the β-Sn matrix with the increase of the cooling rate. The transformation of Zn-rich precipitates enhances the anticorrosive ability of Sn-8Zn-3Bi alloy in 3.5 wt.% NaCl solution. On the contrary, Sn-8Zn-3Bi alloy with a fine needle-like Zn-rich phase shows poor oxidation resistance under air atmosphere, due to the fast diffusion of Zn atoms in Sn matrix.
Compressive Behavior Of Frp-Confined Concrete-Encased Steel Columns, Tao Yu, G Lin, Shi Shun Zhang
Compressive Behavior Of Frp-Confined Concrete-Encased Steel Columns, Tao Yu, G Lin, Shi Shun Zhang
Faculty of Engineering and Information Sciences - Papers: Part A
FRP-confined concrete-encased steel I-section columns (FCSCs) are an emerging form of hybrid columns. An FCSC consists of an outer FRP tube, an encased steel section and a concrete infill. The FCSCs possess many advantages over conventional reinforced concrete columns, including the excellent corrosion resistance, excellent ductility and ease for construction. Existing studies on FCSCs, however, have been rather limited. This paper presents a combined experimental and theoretical study on the behavior of FCSCs under concentric and eccentric compression. The experimental program included the testing of a total of 14 specimens, with the main variables being the section configuration, the thickness …
Nonlinear Dynamical Behavior Of Axially Accelerating Beams: Three-Dimensional Analysis, Mergen H. Ghayesh, Hamed Farokhi
Nonlinear Dynamical Behavior Of Axially Accelerating Beams: Three-Dimensional Analysis, Mergen H. Ghayesh, Hamed Farokhi
Faculty of Engineering and Information Sciences - Papers: Part A
The three-dimensional (3D) nonlinear dynamics of an axially accelerating beam is examined numerically taking into account all of the longitudinal, transverse, and lateral displacements and inertia. Hamilton's principle is employed in order to derive the nonlinear partial differential equations governing the longitudinal, transverse, and lateral motions. These equations are transformed into a set of nonlinear ordinary differential equations by means of the Galerkin discretization technique. The nonlinear global dynamics of the system is then examined by time-integrating the discretized equations of motion. The results are presented in the form of bifurcation diagrams of Poincare maps, time histories, phase-plane portraits, Poincare …
Mechanical Properties And Tribological Behavior Of Aluminum Matrix Composites Reinforced With In-Situ Alb2 Particles, Linlin Yuan, Jingtao Han, Jing Liu, Zhengyi Jiang
Mechanical Properties And Tribological Behavior Of Aluminum Matrix Composites Reinforced With In-Situ Alb2 Particles, Linlin Yuan, Jingtao Han, Jing Liu, Zhengyi Jiang
Faculty of Engineering and Information Sciences - Papers: Part A
Aluminum matrix composites (AMCs) reinforced with in-situ AlB2 particles have been fabricated using a combination of powder metallurgy, hot rolling and solution treatment. The effects of boron content (7 and 12 wt%), hot rolling and heat treatment parameters on the microstructures and mechanical properties of the composites were investigated by means of scanning electron microscopy (SEM), tensile test and micro-hardness measurements. The friction coefficient, wear behavior and scratch morphology of the AMCs and pure aluminum were also studied using scratch tests. The hardness and wear properties are higher in a case of composites when compared to unreinforced matrix material.
Arc Erosion Behavior Of La-Doping Titanium-Zirconium-Molybdenum Alloy, Ping Hu, Bo-Liang Hu, Kuai-She Wang, Fan Yang, Rui Song, Zhi-Tao Yu, Qiang Wang, Wei-Cheng Cao, Dong-Xin Liu, Geng An, Lei Guo, Hai Liang Yu
Arc Erosion Behavior Of La-Doping Titanium-Zirconium-Molybdenum Alloy, Ping Hu, Bo-Liang Hu, Kuai-She Wang, Fan Yang, Rui Song, Zhi-Tao Yu, Qiang Wang, Wei-Cheng Cao, Dong-Xin Liu, Geng An, Lei Guo, Hai Liang Yu
Faculty of Engineering and Information Sciences - Papers: Part A
La-doping titanium-zirconium-molybdenum alloys have good arc erosion resistance performances, but there is no research about the changes during the arc erosion. Arc erosion characteristics of La-doping titanium-zirconium-molybdenum alloys after 5000 operations under direct current 20 V, 15 A and resistive load conditions were investigated using a JF04C test system. The results indicated that the probability distribution and change trend of arc energy and arc time during 5000 operations were similar and the relationship between arc time and arc energy followed exponential function. The change of arc energy with test number was consistent to electrical resistance. Oxide particles, crater and cracks …
Hydrostatic Compression Behavior And High-Pressure Stabilized Β-Phase In Γ-Based Titanium Aluminide Intermetallics, Klaus-Dieter Liss, Ken-Ichi Funakoshi, Rian J. Dippenaar, Yuji Higo, Ayumi Shiro, Mark H. Reid, Hiroshi Suzuki, Takahisa Shobu, Koichi Akita
Hydrostatic Compression Behavior And High-Pressure Stabilized Β-Phase In Γ-Based Titanium Aluminide Intermetallics, Klaus-Dieter Liss, Ken-Ichi Funakoshi, Rian J. Dippenaar, Yuji Higo, Ayumi Shiro, Mark H. Reid, Hiroshi Suzuki, Takahisa Shobu, Koichi Akita
Faculty of Engineering and Information Sciences - Papers: Part A
Titanium aluminides find application in modern light-weight, high-temperature turbines, such as aircraft engines, but suffer from poor plasticity during manufacturing and processing. Huge forging presses enable materials processing in the 10-GPa range, and hence, it is necessary to investigate the phase diagrams of candidate materials under these extreme conditions. Here, we report on an in situ synchrotron X-ray diffraction study in a large-volume press of a modern (α2 + γ) two-phase material, Ti-45Al-7.5Nb-0.25C, under pressures up to 9.6 GPa and temperatures up to 1686 K. At room temperature, the volume response to pressure is accommodated by the transformation γ → …
Correlates Of Children's Objectively Measured Physical Activity And Sedentary Behavior In Early Childhood Education And Care Services: A Systematic Review, Karen Tonge, Rachel A. Jones, Anthony D. Okely
Correlates Of Children's Objectively Measured Physical Activity And Sedentary Behavior In Early Childhood Education And Care Services: A Systematic Review, Karen Tonge, Rachel A. Jones, Anthony D. Okely
Faculty of Social Sciences - Papers (Archive)
Objective: To systematically review the correlates of physical activity and sedentary behavior among children in Early Childhood Education and Care (ECEC) services. Appropriate levels of physical activity and sedentary behavior are important to promote in ECEC services. Methods: A systematic search of 8 databases identified 27 studies published between 1992 and 2015 that met the inclusion criteria. The data were collected and analyzed in 2014 and 2015, and variables were categorized using a Social Ecological Framework. Results: Sixty-six variables were identified. The domains of child characteristics (18 studies) and physical environmental factors (17 studies) were most consistently studied, and, for …
In Vitro Mechanical Fatigue Behavior Of Poly-Ɛ-Caprolactone Macroporous Scaffolds For Cartilage Tissue Engineering: Influence Of Pore Filling By A Poly(Vinyl Alcohol) Gel, J A. Panadero, L Vikingsson, J L. Gomez Ribelles, Senentxu Lanceros-Méndez, Vitor Sencadas
In Vitro Mechanical Fatigue Behavior Of Poly-Ɛ-Caprolactone Macroporous Scaffolds For Cartilage Tissue Engineering: Influence Of Pore Filling By A Poly(Vinyl Alcohol) Gel, J A. Panadero, L Vikingsson, J L. Gomez Ribelles, Senentxu Lanceros-Méndez, Vitor Sencadas
Faculty of Engineering and Information Sciences - Papers: Part A
Polymeric scaffolds used in regenerative therapies are implanted in the damaged tissue and submitted to repeated loading cycles. In the case of articular cartilage engineering, an implanted scaffold is typically subjected to long-term dynamic compression. The evolution of the mechanical properties of the scaffold during bioresorption has been deeply studied in the past, but the possibility of failure due to mechanical fatigue has not been properly addressed. Nevertheless, the macroporous scaffold is susceptible to failure after repeated loading-unloading cycles. In this work fatigue studies of polycaprolactone scaffolds were carried by subjecting the scaffold to repeated compression cycles in conditions simulating …
A Note On The Boundary Behavior For A Modified Green Function In The Upper-Half Space, Y Zhang, Valery Piskarev
A Note On The Boundary Behavior For A Modified Green Function In The Upper-Half Space, Y Zhang, Valery Piskarev
Faculty of Engineering and Information Sciences - Papers: Part A
Motivated by (Xu et al. in Bound. Value Probl. 2013:262, 2013) and (Yang and Ren in Proc. Indian Acad. Sci. Math. Sci. 124(2):175-178, 2014), in this paper we aim to construct a modified Green function in the upper-half space of the n-dimensional Euclidean space, which generalizes the boundary property of general Green potential.
Sodium Borohydride Hydrazinates: Synthesis, Crystal Structures, And Thermal Decomposition Behavior, Jianfeng Mao, Qinfen Gu, Zaiping Guo, Hua-Kun Liu
Sodium Borohydride Hydrazinates: Synthesis, Crystal Structures, And Thermal Decomposition Behavior, Jianfeng Mao, Qinfen Gu, Zaiping Guo, Hua-Kun Liu
Faculty of Engineering and Information Sciences - Papers: Part A
Metallic borohydride hydrazinates are novel boron- and nitrogen-based materials that appear to be promising candidates for chemical hydrogen storage. Herein, sodium borohydride hydrazinates, including NaBH4·N2H4 and NaBH4·2N2H4, were synthesized via a facile solution synthesis approach based on the solid-liquid reaction between NaBH4 and hydrazine in tetrahydrofuran (THF) solution. The crystal structure of NaBH4·2N2H4 was solved to a monoclinic structure with unit cell parameters a = 8.4592(2) Å, b = 11.7131(2) Å, c = 6.4584(1) Å, and β = 100.0777(14)°, with space group A1a1 (9). Each …
Effect Of Extreme Pressure Additives On The Deformation Behavior Of Oxide Scale During The Hot Rolling Of Ferritic Stainless Steel Strips, Liang Hao, Zhengyi Jiang, Xiawei Cheng, Jingwei Zhao, Dongbin Wei, Laizhu Jiang, Suzhen Luo, Ming Luo, Li Ma
Effect Of Extreme Pressure Additives On The Deformation Behavior Of Oxide Scale During The Hot Rolling Of Ferritic Stainless Steel Strips, Liang Hao, Zhengyi Jiang, Xiawei Cheng, Jingwei Zhao, Dongbin Wei, Laizhu Jiang, Suzhen Luo, Ming Luo, Li Ma
Faculty of Engineering and Information Sciences - Papers: Part A
High-speed steel (HSS) materials are universally used as work rolls for the hot rolling of stainless steels. Their use has increased the output of the rolling mill and decreased roll material consumption and grinding. Sticking defects often occur, however, during the hot rolling process. In this article, extreme pressure (EP) additives were dropped on the HSS samples at high temperature. Zinc dialkyl dithiophosphate (ZDDP) was chosen as the most effective EP additive by scratch tests on the HSS samples. In order to determine the optimum proportion of ZDDP in the lubricant, two reduction rates were tested on a Hille 100 …
Hptn 062: A Pilot Randomized Controlled Trial Exploring The Effect Of A Motivational-Interviewing Intervention On Sexual Behavior Among Individuals With Acute Hiv Infection In Lilongwe, Malawi, Audrey Pettifor, Amy Corneli, Gift Kamanga, Kevin Mckenna, Nora Rosenberg, Xuesong Yu, San-San Ou, Cecilia Massa, Patricia Wiyo, Diana Lynn, Jenae Tharaldson, Carol Golin, Irving Hoffman, Catherine L. Mac Phail
Hptn 062: A Pilot Randomized Controlled Trial Exploring The Effect Of A Motivational-Interviewing Intervention On Sexual Behavior Among Individuals With Acute Hiv Infection In Lilongwe, Malawi, Audrey Pettifor, Amy Corneli, Gift Kamanga, Kevin Mckenna, Nora Rosenberg, Xuesong Yu, San-San Ou, Cecilia Massa, Patricia Wiyo, Diana Lynn, Jenae Tharaldson, Carol Golin, Irving Hoffman, Catherine L. Mac Phail
Faculty of Social Sciences - Papers (Archive)
Objective We pilot tested a Motivational Interviewing (MI) -based counseling intervention for individuals with Acute HIV Infection (AHI) to reduce risky sexual behavior in Lilongwe, Malawi. Methods Twenty-eight individuals diagnosed with AHI were randomized to receive either brief education alone, or the brief education plus the MI-based intervention, called Uphungu Wanga. Participants in Uphungu Wanga received four sessions delivered on the day of diagnosis, three days later and at weeks 1 and 2 with a booster session at week 8; participants were followed for 24 weeks from diagnosis. An interviewer administered quantitative questionnaire was conducted at baseline and at weeks …
Objectively Measured Sedentary Behavior In Secondary School Physical Education Lessons, Rachel Sutherland, Elizabeth Campbell, David Lubans, Philip Morgan, Anthony D. Okely, Nicole Nathan, Luke Wolfenden, Karen Gillham, John Wiggers
Objectively Measured Sedentary Behavior In Secondary School Physical Education Lessons, Rachel Sutherland, Elizabeth Campbell, David Lubans, Philip Morgan, Anthony D. Okely, Nicole Nathan, Luke Wolfenden, Karen Gillham, John Wiggers
Faculty of Social Sciences - Papers (Archive)
Abstract presented at the 2014 Global Summit on the Physical Activity of Children, held in Toronto, May 19-22, 2014.
Crowd Behavior Recognition Using Dense Trajectories, Muhammad Rizwan Khokher, Abdesselam Bouzerdoum, Son Lam Phung
Crowd Behavior Recognition Using Dense Trajectories, Muhammad Rizwan Khokher, Abdesselam Bouzerdoum, Son Lam Phung
Faculty of Engineering and Information Sciences - Papers: Part A
This article presents a new method for crowd behavior recognition, using dynamic features extracted from dense trajectories. The histogram of oriented gradient and motion boundary histogram descriptors are computed at dense points along motion trajectories, and tracked using median filtering and displacement information obtained from a dense optical flow field. Then a global representation of the scene is obtained using a bag-of-words model of the extracted features. The locality-constrained linear encoding with sum pooling and L2 plus power normalization are employed in the bag-of-words model. Finally, a support vector machine classifier is trained to recognize the crowd behavior in a …
Study On Hot-Working Behavior Of High Carbon Steel / Low Carbon Steel Composite Material Using Processing Map, Xingjian Gao, Zhengyi Jiang, Dongbin Wei, Sihai Jiao, Dengfu Chen
Study On Hot-Working Behavior Of High Carbon Steel / Low Carbon Steel Composite Material Using Processing Map, Xingjian Gao, Zhengyi Jiang, Dongbin Wei, Sihai Jiao, Dengfu Chen
Faculty of Engineering and Information Sciences - Papers: Part A
The high carbon steel (HCS)/low carbon steel (LCS) laminated composite made by centrifugal casting technology was subjected to hot compression tests on Gleeble 3500 thermomechanical simulator in a range of temperatures (800-1100 oC) and strain rates (0.02-10 s-1). The hot-working behavior of the laminate was characterised by analysing the flow stress-strain curves and constructing the processing map based on dynamic materials model via superimposing efficiency of power dissipation and flow instability maps. The safe and unsafe processing conditions were identified in the processing map which was validated by microstructural examinations. Banded microstructure and micro-shear cracks occurred in the unsafe domains …
Volumes And Bouts Of Sedentary Behavior And Physical Activity: Associations With Cardiometabolic Health In Obese Children, Dylan P. Cliff, Rachel A. Jones, Tracy L. Burrows, Philip J. Morgan, Clare E. Collins, Louise A. Baur, Anthony D. Okely
Volumes And Bouts Of Sedentary Behavior And Physical Activity: Associations With Cardiometabolic Health In Obese Children, Dylan P. Cliff, Rachel A. Jones, Tracy L. Burrows, Philip J. Morgan, Clare E. Collins, Louise A. Baur, Anthony D. Okely
Faculty of Social Sciences - Papers (Archive)
Objective: To examine associations of volumes and bouts of sedentary behavior (SED) and moderate-to-vigorous physical activity (MVPA) with individual and clustered cardio-metabolic outcomes in overweight/obese children. Design and Methods: Cross-sectional data from 120 overweight/obese children (8.3±1.1y, 62% girls, 74% obese) with SED and MVPA assessed using accelerometry. Children were categorised into quartiles of mean bouts.day-1 of SED (10, 20, and 30min) and MVPA (5, 10, and 15min). Associations with triglycerides, HDL cholesterol, glucose, insulin, systolic/diastolic blood pressure, and clustered cardio-metabolic risk (cMet) were examined using linear regression, adjusted for confounders. Results: Independent of MVPA, SED volume was inversely associated …
A Study Of Plastic Deformation Behavior During High Pressure Torsion Process By Crystal Plasticity Finite Element Simulation, Peitang Wei, Cheng Lu, A K. Tieu, Guanyu Deng
A Study Of Plastic Deformation Behavior During High Pressure Torsion Process By Crystal Plasticity Finite Element Simulation, Peitang Wei, Cheng Lu, A K. Tieu, Guanyu Deng
Faculty of Engineering and Information Sciences - Papers: Part A
High pressure torsion (HPT) is an efficient technique of producing ultrafine grained materials with exceptional small grain size. In this study, a crystal plasticity finite element method (CPFEM) model has been developed to investigate the plastic deformation behavior of pure aluminum single crystal during the HPT process. The simulation results show that, the distribution and evolution of the macroscopic plastic strain and the accumulative shear strain are similar. The value increases with the increase of the distance from the center as well as the number of revolution. The simulation is capable of reflecting the anisotropic characteristics of HPT deformation, a …
Atomistic Simulation Of Tensile Deformation Behavior Of Σ5 Tilt Grain Boundaries In Copper Bicrystal, Liang Zhang, Cheng Lu, A Kiet Tieu
Atomistic Simulation Of Tensile Deformation Behavior Of Σ5 Tilt Grain Boundaries In Copper Bicrystal, Liang Zhang, Cheng Lu, A Kiet Tieu
Faculty of Engineering and Information Sciences - Papers: Part A
Experiments on polycrystalline metallic samples have indicated that Grain boundary (GB) structure can affect many material properties related to fracture and plasticity. In this study, atomistic simulations are employed to investigate the structures and mechanical behavior of both symmetric and asymmetric ∑5[0 0 1] tilt GBs of copper bicrystal. First, the equilibrium GB structures are generated by molecular statics simulation at 0K. The results show that the ∑5 asymmetric GBs with different inclination angles (φ) are composed of only two structural units corresponding to the two ∑5 symmetric GBs. Molecular dynamics simulations are then conducted to investigate the mechanical response …
Invited Review: Caseins And The Casein Micelle: Their Biological Functions, Structures, And Behavior In Foods, C Holt, J A. Carver, H Ecroyd, D C. Thorn
Invited Review: Caseins And The Casein Micelle: Their Biological Functions, Structures, And Behavior In Foods, C Holt, J A. Carver, H Ecroyd, D C. Thorn
Faculty of Science, Medicine and Health - Papers: part A
A typical casein micelle contains thousands of casein molecules, most of which form thermodynamically stable complexes with nanoclusters of amorphous calcium phosphate. Like many other unfolded proteins, caseins have an actual or potential tendency to assemble into toxic amyloid fibrils, particularly at the high concentrations found in milk. Fibrils do not form in milk because an alternative aggregation pathway is followed that results in formation of the casein micelle. As a result of forming micelles, nutritious milk can be secreted and stored without causing either pathological calcification or amyloidosis of the mother's mammary tissue. The ability to sequester nanoclusters of …
Computer Gaming And Adhd: Potential Positive Influences On Behavior, Stuart Johnstone
Computer Gaming And Adhd: Potential Positive Influences On Behavior, Stuart Johnstone
Faculty of Social Sciences - Papers (Archive)
Parents often express concerns about that technology, particularly video has on their children. Indeed, have been associated with problems social isolation and a drop-off in academic achievement, and games containing violence shown to increase aggressive thoughts and. Frequent interaction with video games been associated with subsequent problems functions such as attention and impulse-control However, it is important to note that technology and video games can also be used to improve behavior. During my 15 years of research examining the brain electrical activity and behavior of children with Attention Deficit Hyperactivity Disorder (ADHD), there has been an increase in the use …
Trace Elements In The Si Furnace. Part I: Behavior Of Impurities In Quartz During Reduction, Elena Dal Martello, Gabriella Tranell, Oleg Ostrovski, Guangqing Zhang, Ola Raaness, Rune Burg Larsen, Kai Tang, Pramod Koshy
Trace Elements In The Si Furnace. Part I: Behavior Of Impurities In Quartz During Reduction, Elena Dal Martello, Gabriella Tranell, Oleg Ostrovski, Guangqing Zhang, Ola Raaness, Rune Burg Larsen, Kai Tang, Pramod Koshy
Faculty of Engineering and Information Sciences - Papers: Part A
Quartz and carbonaceous materials, which are used in the production of silicon as well as electrodes and refractories in the silicon furnace, contain trace elements mostly in the form of oxides. These oxides can be reduced to gaseous compounds and leave the furnace or stay in the reaction products—metal and slag. This article examines the behavior of trace elements in hydrothermal quartz and quartzite in the reaction of SiO2 with Si or SiC. Mixtures of SiO2 (quartz or quartzite), SiC, and Si in forms of lumps or pellets were heated to 1923 K and 2123 K (1650°C and 1850°C) in …