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Articles 31 - 60 of 426
Full-Text Articles in Science and Technology Studies
Preferred Traces On C⁎-Algebras Of Self-Similar Groupoids Arising As Fixed Points, Joan Claramunt, Aidan Sims
Preferred Traces On C⁎-Algebras Of Self-Similar Groupoids Arising As Fixed Points, Joan Claramunt, Aidan Sims
Faculty of Engineering and Information Sciences - Papers: Part B
Recent results of Laca, Raeburn, Ramagge and Whittaker show that any self-similar action of a groupoid on a graph determines a 1-parameter family of self-mappings of the trace space of the groupoid C⁎-algebra. We investigate the fixed points for these self-mappings, under the same hypotheses that Laca et al. used to prove that the C⁎-algebra of the self-similar action admits a unique KMS state. We prove that for any value of the parameter, the associated self-mapping admits a unique fixed point, which is a universal attractor. This fixed point is precisely the trace that extends to a KMS state on …
The Impact Of Contour Variation On Tumour Control Probability In Anal Cancer, Michael Jones, Jarad Martin, Kerwyn Y. Foo, Patrick Estoesta, Lois C. Holloway, Michael Jameson
The Impact Of Contour Variation On Tumour Control Probability In Anal Cancer, Michael Jones, Jarad Martin, Kerwyn Y. Foo, Patrick Estoesta, Lois C. Holloway, Michael Jameson
Faculty of Engineering and Information Sciences - Papers: Part B
Background: While intensity modulated radiotherapy (IMRT) has been widely adopted for the treatment of anal cancer (AC), the added contour complexity poses potential risks. This study investigates the impact of contour variation on tumour control probability (TCP) when using IMRT for AC. Methods: Nine Australian centres contoured a single computed tomography dataset of a patient with AC. The same optimised template-based IMRT planning protocol was applied to each contour set to generate nine representative treatment plans and their corresponding dose volume histograms. A geometric analysis was performed on all contours. The TCP was calculated for each plan using the linear …
Fracture Toughness Of Cast And Extruded Al6061/15%Al2o3p Metal Matrix Composites, Alan K. Hellier, A. G. Crosky, H. A. Hassan, J. J. Lewandowski
Fracture Toughness Of Cast And Extruded Al6061/15%Al2o3p Metal Matrix Composites, Alan K. Hellier, A. G. Crosky, H. A. Hassan, J. J. Lewandowski
Faculty of Engineering and Information Sciences - Papers: Part A
Particulate reinforced metal matrix composites (PRMMCs) are of interest owing to the low cost of their raw materials and their ease of fabrication, making them suitable for applications requiring relatively high-volume production. The improved properties of PRMMCs result from the addition of hard ceramic particles (such as Al2O3 or SiC); the size, shape, volume fraction, interfacial properties and distribution of these (together with the fabrication method) determine the mechanical behaviour of the composite. However, PRMMCs have inferior ductility, toughness and low-cycle fatigue properties compared with unreinforced alloys, often limiting their usefulness in practice. Reinforcements of between 15 volume % and …
Residual Stress Effects On Fatigue Crack Growth From A T-Butt Weld Toe, Alan K. Hellier, H. Li, B. G. Prusty, G. M. Pearce, M. Reid, A. M. Paradowska
Residual Stress Effects On Fatigue Crack Growth From A T-Butt Weld Toe, Alan K. Hellier, H. Li, B. G. Prusty, G. M. Pearce, M. Reid, A. M. Paradowska
Faculty of Engineering and Information Sciences - Papers: Part A
A350 grade black mild steel is one of the most widely used structural materials in the world, being commonly found in buildings, bridges and offshore structures.Welding is commonly used to join two plates of structural steel and this often takes the form of a T-butt.In addition, other more complex geometrical joints are often simplified for stress analysis purposes by approximating them as 2-D T-butt plate models (e.g. skewed T-joints, cruciform welded joints, tubular welded joints, pipe–plate joints, etc.).However, all such welds are potentially susceptible to fatigue crack initiation and slow but accelerating growth arising as a result of fluctuating service …
Static Force Dependency Of Bone Conduction Transducer As Sensory Feedback For Stump-Socket Based Prosthesis, Raphael Mayer, Alireza Mohammadi, Gursel Alici, Peter Choong, Denny Oetomo
Static Force Dependency Of Bone Conduction Transducer As Sensory Feedback For Stump-Socket Based Prosthesis, Raphael Mayer, Alireza Mohammadi, Gursel Alici, Peter Choong, Denny Oetomo
Faculty of Engineering and Information Sciences - Papers: Part B
The dependency of a novel sensory feedback for stump-socket based prosthesis on the static force is presented using a bone conduction transducer as feedback source. The stimulation was induced onto the bony landmarks of the elbow, specifically the Ulna and presented in an interval halving method. The perception threshold in the range of tactile and auditory perception at three different force levels has been tested. The inter subject variability is bigger than the intra subject variation. The small static force variation suggests a similar approach as in bone conduction hearing aids and therefore a static force bigger than 6N should …
Quality Evaluation Tests For Tensile Strength Of Reactive Powder Concrete, Hussamaldeen Goaiz, Tao Yu, Muhammad N. S Hadi
Quality Evaluation Tests For Tensile Strength Of Reactive Powder Concrete, Hussamaldeen Goaiz, Tao Yu, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part B
This study presents a comparison between different testing procedures to determine the tensile strength of reactive powder concrete (RPC). The tensile strength test methods include a direct tensile test and two indirect tensile tests, the splitting test and the double punch test (DPT). In this study, the RPC was designed to obtain a nominal compressive strength of 100 MPa at the age of 28 days. Macro steel fibers were used to reinforce the RPC by volumetric percentages of 0, 1, 2, and 3%. Mechanical properties of RPC were obtained at 28 days such as compressive, tensile, and flexural strengths; compressive …
A Modified Black-Scholes Pricing Formula For European Options With Bounded Underlying Prices, Song-Ping Zhu, Xinjiang He
A Modified Black-Scholes Pricing Formula For European Options With Bounded Underlying Prices, Song-Ping Zhu, Xinjiang He
Faculty of Engineering and Information Sciences - Papers: Part B
In this paper, a modified Black-Scholes (B-S) model is proposed, based on a revised assumption that the range of the underlying price varies within a finite zone, rather than being allowed to vary in a semi-infinite zone as presented in the classical B-S theory. This is motivated by the fact that the underlying price of any option can never reach infinity in reality; a trader may use our new formula to adjust the option price that he/she is willing to long or short. To develop this modified option pricing formula, we assume that a trader has a view on the …
Modeling And Experimental Evaluation Of Bending Behavior Of Soft Pneumatic Actuators Made Of Discrete Actuation Chambers, Gursel Alici, Taylor Canty, Rahim Mutlu, Weiping Hu, Vitor Sencadas
Modeling And Experimental Evaluation Of Bending Behavior Of Soft Pneumatic Actuators Made Of Discrete Actuation Chambers, Gursel Alici, Taylor Canty, Rahim Mutlu, Weiping Hu, Vitor Sencadas
Faculty of Engineering and Information Sciences - Papers: Part B
In this article, we have established an analytical model to estimate the quasi-static bending displacement (i.e., angle) of the pneumatic actuators made of two different elastomeric silicones (Elastosil M4601 with a bulk modulus of elasticity of 262 kPa and Translucent Soft silicone with a bulk modulus of elasticity of 48 kPa - both experimentally determined) and of discrete chambers, partially separated from each other with a gap in between the chambers to increase the magnitude of their bending angle. The numerical bending angle results from the proposed gray-box model, and the corresponding experimental results match well that the model is …
Combined Message Passing Based Sbl With Dirichlet Process Prior For Sparse Signal Recovery With Multiple Measurement Vectors, Zhengdao Yuan, Chuanzong Zhang, Qinghua Guo, Zhongyong Wang, Xinhua Lu, Sheng Wu
Combined Message Passing Based Sbl With Dirichlet Process Prior For Sparse Signal Recovery With Multiple Measurement Vectors, Zhengdao Yuan, Chuanzong Zhang, Qinghua Guo, Zhongyong Wang, Xinhua Lu, Sheng Wu
Faculty of Engineering and Information Sciences - Papers: Part B
This paper concerns the problem of sparse signal recovery with multiple measurement vectors, where the sparse signal vectors share multiple supports (i.e., the signal vectors can be clustered and the vectors in a cluster share a common support) and the prior knowledge on the supports of the vectors is unknown. This problem can be solved using sparse Bayesian learning (SBL) with Dirichlet process (DP) as hyper-prior, which is named DP-SBL in this paper. This work aims to design efficient inference algorithms. The variational inference for DP mixtures, in particular mean field (MF) inference, has been studied, and applying it to …
Delay-Dependent Fault-Tolerant Shape Control For Stochastic Distribution Systems, Yu Cheng, Long Chen, Tao Li, Haiping Du
Delay-Dependent Fault-Tolerant Shape Control For Stochastic Distribution Systems, Yu Cheng, Long Chen, Tao Li, Haiping Du
Faculty of Engineering and Information Sciences - Papers: Part B
A new adaptive delay-dependent fault-tolerant shape control strategy is proposed for the stochastic distribution system with time-delay, which can effectively make the output probability density function (PDF) track a given target distribution. In this framework, firstly, a system model based on PDF with the actuator failure is constructed. And then, an adaptive delay-dependent fault-tolerant controller, which include a normal controller and an adaptive compensation controller is designed. The normal controller can track the given output distribution with an optimized performance index when there is no actuator fault, and the adaptive compensation controller can reduce the negative effects caused by the …
Design Of A Single-Layer Microchannel For Continuous Sheathless Single-Stream Particle Inertial Focusing, Yan Zhang, Jun Zhang, Fei Tang, Weihua Li, Xiaohao Wang
Design Of A Single-Layer Microchannel For Continuous Sheathless Single-Stream Particle Inertial Focusing, Yan Zhang, Jun Zhang, Fei Tang, Weihua Li, Xiaohao Wang
Faculty of Engineering and Information Sciences - Papers: Part B
High-throughput, high-precision single-stream focusing of microparticles has a potentially wide range of applications in biochemical analysis and clinical diagnosis. In this work, we develop a sheathless three-dimensional (3D) particle-focusing method in a single-layer microchannel. This novel microchannel consists of periodic high-aspect-ratio curved channels and straight channels. The proposed method takes advantage of both the curved channels, which induce Dean flow to promote particle migration, and straight channels, which suppress the remaining stirring effects of Dean flow to stabilize the achieved particle focusing. The 3D particle focusing is demonstrated experimentally, and the mechanism is analyzed theoretically. The effects of flow rate, …
Sensor-Enabled Activity Class Recognition In Preschoolers: Hip Versus Wrist Data, Stewart Trost, Dylan P. Cliff, Matthew Ahmadi, Tuc Nguyen, M. Hagenbuchner
Sensor-Enabled Activity Class Recognition In Preschoolers: Hip Versus Wrist Data, Stewart Trost, Dylan P. Cliff, Matthew Ahmadi, Tuc Nguyen, M. Hagenbuchner
Faculty of Engineering and Information Sciences - Papers: Part B
No abstract provided.
Multizone Soundfield Reproduction With Privacy- And Quality-Based Speech Masking Filters, Jacob Donley, Christian H. Ritz, W Kleijn
Multizone Soundfield Reproduction With Privacy- And Quality-Based Speech Masking Filters, Jacob Donley, Christian H. Ritz, W Kleijn
Faculty of Engineering and Information Sciences - Papers: Part B
Reproducing zones of personal sound is a challenging signal processing problem which has garnered considerable research interest in recent years. We introduce in this work an extended method to multizone soundfield reproduction which overcomes issues with speech privacy and quality. Measures of Speech Intelligibility Contrast (SIC) and speech quality are used as cost functions in an optimisation of speech privacy and quality. Novel spatial and (temporal) frequency domain speech masker filter designs are proposed to accompany the optimisation process. Spatial masking filters are designed using multizone soundfield algorithms which are dependent on the target speech multizone reproduction. Combinations of estimates …
A New Concentration Detection System For Sf6/N2 Mixture Gas In Extra/Ultra High Voltage Power Transmission Systems, Baojun Qu, Qingxin Yang, Yongjian Li, Reza Malekian, Zhixiong Li
A New Concentration Detection System For Sf6/N2 Mixture Gas In Extra/Ultra High Voltage Power Transmission Systems, Baojun Qu, Qingxin Yang, Yongjian Li, Reza Malekian, Zhixiong Li
Faculty of Engineering and Information Sciences - Papers: Part B
This paper develops a new detection system, for the first time, to detect the gas concentrations of the SF6/N2 mixture in extra/ultra-high voltage power transmission systems. The concentrations of SF6 and N2 are calculated from the thermal conductivity function of the mixture gas. The main contribution of this work is that a specially-designed thermostatic chamber with adaptive temperature controller is developed to ensure constant pressure of the gas flowed through the thermal conductivity sensor. Another contribution is the combination of multiple sensors (e.g. humidity and electrochemical sensors), which enables the detector to address the penetration effects of H2O and O2 …
Changes In Gait And Plantar Foot Loading Upon Using Vibrotactile Wearable Biofeedback System In Patients With Stroke, Christina Ma, Yong-Ping Zheng, Winson Lee
Changes In Gait And Plantar Foot Loading Upon Using Vibrotactile Wearable Biofeedback System In Patients With Stroke, Christina Ma, Yong-Ping Zheng, Winson Lee
Faculty of Engineering and Information Sciences - Papers: Part B
Background: Patients with stroke walk with excessive foot inversion at the affected side, which may disturb their balance and gait. Objectives: This study aimed to investigate the effects of instant biofeedback of plantar force at the medial and lateral forefoot regions on gait and plantar foot loading in patients with stroke. Methods: A total of eight patients with hemiplegic stroke, who had flexible rearfoot varus deformity at the affected side, participated in this study. A vibrotactile biofeedback system was developed and evaluated. It analyzed forces at the medial and lateral forefeet, and instantly provided vibration clues when the plantar force …
Assessing The Integration Of Forward Osmosis And Anaerobic Digestion For Simultaneous Wastewater Treatment And Resource Recovery, Ashley Ansari, Faisal I. Hai, William E. Price, Hao H. Ngo, Wenshan Guo, Long D. Nghiem
Assessing The Integration Of Forward Osmosis And Anaerobic Digestion For Simultaneous Wastewater Treatment And Resource Recovery, Ashley Ansari, Faisal I. Hai, William E. Price, Hao H. Ngo, Wenshan Guo, Long D. Nghiem
Faculty of Engineering and Information Sciences - Papers: Part B
This study assessed the performance and key challenges associated with the integration of forward osmosis (FO) and anaerobic digestion for wastewater treatment and resource recovery. Using a thin film composite polyamide FO membrane, maximising the pre-concentration factor (i.e. system water recovery) resulted in the enrichment of organics and salinity in wastewater. Biomethane potential evaluation indicated that methane production increased correspondingly with the FO pre-concentration factor due to the organic retention in the feed solution. At 90% water recovery, about 10% more methane was produced when using NaOAc compared with NaCl because of the contribution of biodegradable reverse NaOAc flux. No …
Data Privacy And System Security For Banking And Financial Services Industry Based On Cloud Computing Infrastructure, Abhishek Mahalle, Jianming Yong, Xiaohui Tao, Jun Shen
Data Privacy And System Security For Banking And Financial Services Industry Based On Cloud Computing Infrastructure, Abhishek Mahalle, Jianming Yong, Xiaohui Tao, Jun Shen
Faculty of Engineering and Information Sciences - Papers: Part B
No abstract provided.
Evaluating The Properties Of Mixtures Of Steel Furnace Slag, Coal Wash, And Rubber Crumbs Used As Subballast, Buddhima Indraratna, Yujie Qi, Ana Heitor
Evaluating The Properties Of Mixtures Of Steel Furnace Slag, Coal Wash, And Rubber Crumbs Used As Subballast, Buddhima Indraratna, Yujie Qi, Ana Heitor
Faculty of Engineering and Information Sciences - Papers: Part B
Steel furnace slag (SFS) and coal wash (CW) are two common by-products from the coal-mining and steel industries in Australia. Rubber crumbs (RC) is a material derived from waste tires contributing to environmental problems in most developed countries. Reusing and recycling these waste materials is not only economically beneficial and environmentally sustainable, but it also helps to address geotechnical problems such as track degradation. In this study, SFS, CW, and RC are blended to explore the feasibility of obtaining an energy-absorbing capping layer with properties similar or superior to conventional subballast. Comprehensive laboratory investigations have been carried out to study …
Two Decades Of Advancement In Process Simulation Testing Of Ballast Strength, Deformation, And Degradation, Buddhima Indraratna, Ngoc Trung Ngo, Sanjay Nimbalkar, Cholachat Rujikiatkamjorn
Two Decades Of Advancement In Process Simulation Testing Of Ballast Strength, Deformation, And Degradation, Buddhima Indraratna, Ngoc Trung Ngo, Sanjay Nimbalkar, Cholachat Rujikiatkamjorn
Faculty of Engineering and Information Sciences - Papers: Part B
This paper describes salient features of a set of large-scale ballast testing equipment developed at the University of Wollongong, Australia, and how the test results and research outcomes have contributed to transforming tracks in the Australian heavy haul and commuter networks, particularly with regards to the strength, deformation, and degradation of ballast. Ideally, ballast assemblies should be tested in prototype scale under actual loading conditions. This is because a reduction in particle sizes for testing in smaller equipment can reduce the internal angle of friction (shearing resistance) of the granular assembly in a macro sense, and the angularity of the …
Simultaneous Estimation Of Primary And Cross-Channel Gains For Underlay Cognitive Radios, Junteng Yao, Ming Jin, Qinghua Guo, Youming Li
Simultaneous Estimation Of Primary And Cross-Channel Gains For Underlay Cognitive Radios, Junteng Yao, Ming Jin, Qinghua Guo, Youming Li
Faculty of Engineering and Information Sciences - Papers: Part B
In underlay cognitive radios, the primary-channel gain from a primary transmitter (PU-Tx) to a primary receiver (PU-Rx) and the cross-channel gain from a cognitive transmitter (SU-Tx) to the PU-Rx are crucial for the SU-Tx in controlling its transmit power when sharing spectrum with primary users (PUs). However, the non-cooperation between PUs and secondary users (SUs) makes it difficult for the SU-Tx to acquire the primary-channel and cross-channel gains, in particular when the channel reciprocity is not applicable. Most existing works focus on cross-channel gain estimation and are often based on the channel reciprocity. In this work, we propose a scheme …
Lattice Boltzmann Simulation Of Flow And Heat Transfer Evolution Inside Encapsulated Phase Change Materials Due To Natural Convection Melting, Qi Lin, Shugang Wang, Zhenjun Ma, Jihong Wang, Tengfei Zhang
Lattice Boltzmann Simulation Of Flow And Heat Transfer Evolution Inside Encapsulated Phase Change Materials Due To Natural Convection Melting, Qi Lin, Shugang Wang, Zhenjun Ma, Jihong Wang, Tengfei Zhang
Faculty of Engineering and Information Sciences - Papers: Part B
A comprehensive study of the melting process inside a capsule can potentially take full advantages of latent heat of phase change materials (PCMs). The present study was devoted to the problem of complex interaction of natural convection and melting of PCMs inside a spherical capsule under differen t sizes. The numerical results, simulated by lattice Boltzmann method (LBM), were compared with experimental data and published simulations. The results showed that LBM presented desirable accuracy compared to traditional computational fluid dynamics (CFD) methods. Then, the effects of non-uniform PCM properties, expressed by the solid/liquid thermal diffusivity ratio, on the melting rate …
Recent Advances In Photonic Dosimeters For Medical Radiation Therapy, James Archer, Enbang Li
Recent Advances In Photonic Dosimeters For Medical Radiation Therapy, James Archer, Enbang Li
Faculty of Engineering and Information Sciences - Papers: Part B
Radiation therapy, which uses X-rays to destroy or injure cancer cells, has become one of the most important modalities to treat the primary cancer or advanced cancer. High resolution, water equivalent and passive X-ray dosimeters are highly desirable for developing quality assurance (QA) systems for novel cancer therapy like microbeam radiation therapy (MRT) which is currently under development. Here we present the latest developments of high spatial resolution scintillator based photonic dosimeters, and their applications to clinical external radiation beam therapies: specifically high energy linear accelerator (LINAC) photon beams and low energy synchrotron photon beams. We have developed optical fiber …
Experimental Investigation On Permeability And Mechanical Deformation Of Coal Containing Gas Under Load, Runsheng Lv, Bing Li, Zhimin Song, Gaofeng Liu
Experimental Investigation On Permeability And Mechanical Deformation Of Coal Containing Gas Under Load, Runsheng Lv, Bing Li, Zhimin Song, Gaofeng Liu
Faculty of Engineering and Information Sciences - Papers: Part B
Coalbed effective permeability is widely used as a primary index to evaluate gas-drainage effect in CBM exploitation field. However, it seems to be difficult to obtain by the reason of dynamic change in close relationship with crustal stress, methane pressure, porosity, and adsorption. Due to their dissimilar adsorption properties and tectonic deformation degrees, different types of coal containing gas have various stress-strain and gas seepage curves. The paper presents the experimental investigations of the dynamic relationship between coal permeability and deformation under load. In this work, stress-strain and permeability investigations were performed using anthracite lump with a vitrinite reflectance of …
Micro Forming Of Metallic Composites, Hang Yin, Zhengyi Jiang, Haibo Xie, Fanghui Jia, Xiaogang Wang, Cunlong Zhou
Micro Forming Of Metallic Composites, Hang Yin, Zhengyi Jiang, Haibo Xie, Fanghui Jia, Xiaogang Wang, Cunlong Zhou
Faculty of Engineering and Information Sciences - Papers: Part B
As the popularisation of electronical devices, the development of micro systems has attracted the attention of the researchers. Therefore, it is crucial to identify the effects of relevant parameters in micro forming process. This study mainly focuses on the impact of holding time in heat treatment process on the properties of Cu-Al-Cu laminate composite materials during micro deep drawing process. The results demonstrate that the Cu-Al-Cu laminate composite material that experiences 10-minute holding time can obtain better properties. Furthermore, a simulation model of the micro forming process is developed and the simulation results are compared with the experimental ones.
A Dichotomy For Groupoid C*-Algebras, Timothy Rainone, Aidan Sims
A Dichotomy For Groupoid C*-Algebras, Timothy Rainone, Aidan Sims
Faculty of Engineering and Information Sciences - Papers: Part B
We study the finite versus infinite nature of C -algebras arising from étale groupoids. For an ample groupoid, we relate infiniteness of the reduced C -algebra to notions of paradoxicality of a K-theoretic flavor. We construct a pre-ordered abelian monoid which generalizes the type semigroup introduced by Rørdam and Sierakowski for totally disconnected discrete transformation groups. This monoid characterizes the finite/infinite nature of the reduced groupoid C -algebra of in the sense that if is ample, minimal, topologically principal, and is almost unperforated, we obtain a dichotomy between the stably finite and the purely infinite for. A type semigroup for …
Analog Least Mean Square Loop For Self-Interference Cancellation In Generalized Continuous Wave Sar, Anh Tuyen Le, Yijiang Nan, Le Chung Tran, Xiaojing Huang, Y J. Guo, J (Yiannis) Vardaxoglou
Analog Least Mean Square Loop For Self-Interference Cancellation In Generalized Continuous Wave Sar, Anh Tuyen Le, Yijiang Nan, Le Chung Tran, Xiaojing Huang, Y J. Guo, J (Yiannis) Vardaxoglou
Faculty of Engineering and Information Sciences - Papers: Part B
Generalized continuous wave synthetic aperture radar (GCW-SAR) is a promising new imaging radar system since it applies the full-duplex (FD) transmission technique to achieve continuous signaling in order to overcome several fundamental limitations of the conventional pulsed SARs. As in any FD wireless communication system, self-interference (SI) is also a key problem which can impact on the GCW-SAR system. In this paper, the analog least mean square (ALMS) loop in the radio frequency domain is adopted to cancel the SI for a GCW-SAR system with periodic chirp signaling. The average residual SI power after the ALMS loop is analyzed theoretically …
Experimental Investigation And Assessment Of Internal Stability Of Granular Filters Under One-Dimensional Static And Cyclic Loading, Jahanzaib Israr, Jehangir Israr
Experimental Investigation And Assessment Of Internal Stability Of Granular Filters Under One-Dimensional Static And Cyclic Loading, Jahanzaib Israr, Jehangir Israr
Faculty of Engineering and Information Sciences - Papers: Part B
Internal instability occurs when the finer fraction of a filter escapes with the infiltrates, causing permanent changes to its particle size distribution and rendering it ineffective. Thus far, numerous criteria based on particle and constriction size distributions have been proposed to assess the potential of internal instability. This paper reports the results of pressure gradient controlled hydraulic tests performed on granular soils including silt-sand-gravel, sand, and sand-gravel mixtures with their uniformity coefficients ranging from 1 to 304 and compacted at varying relative densities between 0 and 100 %. Select dense samples were then subjected to a series of hydraulic tests …
Axial Compressive Behavior Of Steel Equal Angle Section-Reinforced Square High-Strength Concrete Column, Ayoob Ibrahim, M Neaz Sheikh, Muhammad N. S Hadi
Axial Compressive Behavior Of Steel Equal Angle Section-Reinforced Square High-Strength Concrete Column, Ayoob Ibrahim, M Neaz Sheikh, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part B
A new method of reinforcing concrete columns with steel equal angle (SEA) sections has been investigated. A total of 12 square high-strength concrete (HSC) column specimens (with 210 mm [8.26 in.] sides and 600 mm [23.62 in.] height) reinforced longitudinally with either steel bars or SEA sections were cast and tested. The lateral tie spacing of specimens varied from 50 to 400 mm (1.96 to 15.74 in.). The influences of the type of longitudinal reinforcement and the spacing of lateral ties on the behavior of HSC specimens under axial compression were investigated. Experimental results showed that the use of the …
Numerical Simulation Of The Shear Behavior Of Rock Joints Filled With Unsaturated Soil, Libin Gong, Jan Nemcik, Ting X. Ren
Numerical Simulation Of The Shear Behavior Of Rock Joints Filled With Unsaturated Soil, Libin Gong, Jan Nemcik, Ting X. Ren
Faculty of Engineering and Information Sciences - Papers: Part B
Weak infilled discontinuities commonly exist in rock masses, in which the infill degree of saturation largely influences the overalljoint shear behavior and ground stability. However, so far, research on the shear of infilled joints at unsaturated conditions is rare, especiallythose performed in numerical simulation. To the authors'knowledge, no attempts have been made to investigate the shear-induced variationsin unsaturated soil parameters, which are vital for proposing the infilled-joint constitutive models. For thefirst time, a series of constant watercontent direct shear tests on the unsaturated infilled-joint soil were conducted using the numerical software Fast Lagrangian Analysis ofContinua (FLAC)/Two-Phase Flow. Intrinsic soil-water retention …
Total Electron-Scattering Cross Sections From Pyridine Molecules In The Energy Range 1-200 Ev, A I. Lozano, J Jimenez, Francisco Blanco, Gustavo Garcia
Total Electron-Scattering Cross Sections From Pyridine Molecules In The Energy Range 1-200 Ev, A I. Lozano, J Jimenez, Francisco Blanco, Gustavo Garcia
Faculty of Engineering and Information Sciences - Papers: Part B
We report on total electron-scattering cross sections from pyridine as measured with a magnetically confinedelectron-beam system for impact energies ranging from 1 to 200 eV, including measurements for energies below10 eV. Reasonable agreement with previous measurements for energies above 10 eV has been found. Systematicerrors arising from elastically and rotationally scattered electrons into the detector acceptance angle have beenevaluated. Results are compared with available calculation both for the 10-200 eV and below 10 eV energy ranges.The evaluated data provided in this study will facilitate electron transport modeling in biologically relevant media