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Articles 1021 - 1050 of 14367

Full-Text Articles in Social and Behavioral Sciences

Mechanical Properties Of Aluminium Metal Matrix Nanocomposites Manufactured By Assisted-Flake Powder Thixoforming Process, Saud Almotairy, Alireza Fadavi Boostani, M Hassani, Dongbin Wei, Zhengyi Jiang Jan 2019

Mechanical Properties Of Aluminium Metal Matrix Nanocomposites Manufactured By Assisted-Flake Powder Thixoforming Process, Saud Almotairy, Alireza Fadavi Boostani, M Hassani, Dongbin Wei, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

This study discusses the superior effect of thixoforming process on enhancing the tensile properties of aluminium matrix composite produced using flake metallurgy route. The flake metallurgy process was utilised to manufacture aluminium matrix composites followed by thixoforming process. Microstructural investigations carried out using transmission electron microscope have shown the synergic effect of thixoforming process on rendering uniform distribution of SiC nanoparticles associated with lower porosity content. X-ray diffraction characterisations have revealed the promising effect of uniform dispersion of SiC nanoparticles on restricting the grain growth of aluminium matrix within nanoscale regime (90 nm) even at high semi-solid thixoforming temperatures (575 …

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A Crystal Plasticity Fem Investigation Of A Cu Single Crystal Processed By Accumulative Roll-Bonding, Hui Wang, Cheng Lu, Anh Kiet Tieu Jan 2019

A Crystal Plasticity Fem Investigation Of A Cu Single Crystal Processed By Accumulative Roll-Bonding, Hui Wang, Cheng Lu, Anh Kiet Tieu

Faculty of Engineering and Information Sciences - Papers: Part B

In this study, texture modelling of a copper single crystal processed by accumulative roll-bonding (ARB) was conducted for the first time. A crystal plasticity finite element method (CPFEM) model was developed, and the predicated textures were validated by the experimental observations conducted by another research group. A heterogeneous through-thickness deformation was revealed. Two types of matrix bands formed through the thickness after the first ARB cycle, and different crystal rotation, slip system activation, and shear strain evolved in matrix bands. Due to the cutting, stacking and roll-bonding involved in ARB, transition of deformation behaviours has been found after a position …

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Flexible Surface Electrodes Targeting Biopotential Signals From Forearm Muscles For Control Of Prosthetic Hands: Part 1 - Characterisation Of Semg Electrodes, Siobhan O'Brien, Thomas Searle, Gursel Alici Jan 2019

Flexible Surface Electrodes Targeting Biopotential Signals From Forearm Muscles For Control Of Prosthetic Hands: Part 1 - Characterisation Of Semg Electrodes, Siobhan O'Brien, Thomas Searle, Gursel Alici

Faculty of Engineering and Information Sciences - Papers: Part B

This study is Part 1 of two studies which investigate the use of various flexible surface sensors as an alternative to the gold standard Ag/AgCl surface electromyography (sEMG) electrodes in identifying movement intention from a user during common hand gestures. Three conductive textiles, two commercial conductive elastomers and one E-skin elastomer produced on site were tested as biopotential electrodes to establish the efficacy of each in gathering movement intention from the human brain at the level of the muscle. Testing was performed in vivo on two participants across three hand gestures, with results demonstrating that sEMG electrodes made from a …

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3d Printable Vacuum-Powered Soft Linear Actuators, Charbel Tawk, Geoffrey M. Spinks, Marc In Het Panhuis, Gursel Alici Jan 2019

3d Printable Vacuum-Powered Soft Linear Actuators, Charbel Tawk, Geoffrey M. Spinks, Marc In Het Panhuis, Gursel Alici

Faculty of Engineering and Information Sciences - Papers: Part B

Soft robots which are made of highly deformable materials are ideal to operate in unstructured environments and to interact safely with humans. This work presents directly 3D printed linear soft vacuum actuators (LSOVA), that are manufactured in a single step without requiring any post-processing and support material, using a low-cost and open-source fused deposition modeling 3D printer. LSOVA have multiple advantages such as high bandwidths (~6.49Hz), high output forces (~27N) and long lifetimes (~21,500 cycles). Finite element models and analytical models are developed to accurately predict the performance of LSOVA in terms of blocked force and linear stroke. The LSOVAs …

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Secondary Students' Ideas About Scientific Concepts Underlying Climate Change, Lorna E. Jarrett, George J. Takacs Jan 2019

Secondary Students' Ideas About Scientific Concepts Underlying Climate Change, Lorna E. Jarrett, George J. Takacs

Faculty of Engineering and Information Sciences - Papers: Part B

We present ideas about concepts underlying climate change, held by students in years 9 and 10. Misconceptions about climate change are common among students, and may be due to misconceptions about underlying concepts. To investigate this, we developed the Climate Change Concept Inventory (CCCI), and trialed it with 229 students; corroborating findings through focus group interviews. Our interview method and data analysis methods are described. Findings included overestimation of human contributions to atmospheric carbon inputs, ultra violet radiation in sunlight, and greenhouse gases in the atmosphere. Students were unaware that CO2 dissolves in water, and of the role of oceans …

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Evaluation Of Different B-Values In Dwi And 1h Mrs For Pancreatic Cancer And Pancreatitis: A Rabbit Model, Liguo Hao, Lijie Liu, Xin Meng, Guanghao Yu, Enbang Li, Hongqian Gu Jan 2019

Evaluation Of Different B-Values In Dwi And 1h Mrs For Pancreatic Cancer And Pancreatitis: A Rabbit Model, Liguo Hao, Lijie Liu, Xin Meng, Guanghao Yu, Enbang Li, Hongqian Gu

Faculty of Engineering and Information Sciences - Papers: Part B

Pancreatic cancer is a common malignant tumor with high incidence of metastasis. Currently, there is no absolute standard for the choice of b-value for diffusion-weighted imaging (DWI) for pancreatic cancer. The b-value is rarely reported in animal model study, especially in pancreatic cancer/mass pancreatitis rabbit models. The authors' aim was to determine the different b-values to differentiate the diagnosis of pancreatic cancer and mass pancreatitis in rabbit models using DWI. When comparing the effect of different b-values in diagnostic process, the pathological results could be regarded as the gold standard. In this research, 30 healthy New Zealand rabbits were selected …

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On Matrix Completion-Based Channel Estimators For Massive Mimo Systems, Mingjun Ding, Xiaodong Yang, Rui Hu, Zhitao Xiao, Jun Tong, Jiangtao Xi Jan 2019

On Matrix Completion-Based Channel Estimators For Massive Mimo Systems, Mingjun Ding, Xiaodong Yang, Rui Hu, Zhitao Xiao, Jun Tong, Jiangtao Xi

Faculty of Engineering and Information Sciences - Papers: Part B

Large-scale symmetric arrays such as uniform linear arrays (ULA) have been widely used in wireless communications for improving spectrum efficiency and reliability. Channel state information (CSI) is critical for optimizing massive multiple-input multiple-output(MIMO)-based wireless communication systems. The acquisition of CSI for massive MIMO faces challenges such as training shortage and high computational complexity. For millimeter wave MIMO systems, the low-rankness of the channel can be utilized to address the challenge of training shortage. In this paper, we compared several channel estimation schemes based on matrix completion (MC) for symmetrical arrays. Performance and computational complexity are discussed and compared. By comparing …

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Beach Safety: Can Drones Provide A Platform For Sighting Sharks?, Paul A. Butcher, Toby Piddocke, Andrew Colefax, Brent Hoade, Victor M. Peddemors, Lauren Borg, Brian R. Cullis Jan 2019

Beach Safety: Can Drones Provide A Platform For Sighting Sharks?, Paul A. Butcher, Toby Piddocke, Andrew Colefax, Brent Hoade, Victor M. Peddemors, Lauren Borg, Brian R. Cullis

Faculty of Engineering and Information Sciences - Papers: Part B

CSIRO 2019 Open Access. Context: A series of unprovoked shark attacks on New South Wales (Australia) beaches between 2013 and 2015 triggered an investigation of new and emerging technologies for protecting bathers. Traditionally, bather protection has included several methods for shark capture, detection and/or deterrence but has often relied on environmentally damaging techniques. Heightened environmental awareness, including the important role of sharks in the marine ecosystem, demands new techniques for protection from shark attack. Recent advances in drone-related technologies have enabled the possibility of real-time shark detection and alerting. Aim: To determine the reliability of drones to detect shark analogues …

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An Analysis Of Organic Carbon Removal In A Two-Reactor Cascade With Recycle And A Two-Reactor Step-Feed Cascade With Recycle, Mark Nelson, Bronwyn Bradshaw-Hajek Jan 2019

An Analysis Of Organic Carbon Removal In A Two-Reactor Cascade With Recycle And A Two-Reactor Step-Feed Cascade With Recycle, Mark Nelson, Bronwyn Bradshaw-Hajek

Faculty of Engineering and Information Sciences - Papers: Part B

2019 Curtin University and John Wiley & Sons, Ltd. We analyse the steady-state operation of two process configurations that employ a reactor cascade with recycle. The first process configuration is a two-reactor cascade in which the feed stream enters into the first reactor. The second process configuration is a two-reactor step-feed cascade in which the feed stream enters the second reactor. In each process configuration, part of the effluent stream is recycled back into the first reactor. The reactors in the cascade need not be of equal volume. The reaction is assumed to be a biological process governed by Monod …

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Zinc Removal From Basic Oxygen Steelmaking (Bos) Filter Cake By Sintering, Huibin Li, David J. Pinson, Paul Zulli, Liming Lu, Raymond Longbottom, Sheng J. Chew, Brian J. Monaghan, Guangqing Zhang Jan 2019

Zinc Removal From Basic Oxygen Steelmaking (Bos) Filter Cake By Sintering, Huibin Li, David J. Pinson, Paul Zulli, Liming Lu, Raymond Longbottom, Sheng J. Chew, Brian J. Monaghan, Guangqing Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

2019 Zinc removal from basic oxygen steelmaking filter cake was studied by tablet testing and in a millipot under different conditions. The results from tablet testing show that coke and metallic iron in filter cake play the role of reductants to remove zinc during sintering. Zinc removal increased with increasing temperature and decreasing partial pressure of oxygen. Zinc removal reached 24.6% when a tablet of filter cake without addition of coke was sintered at 1300 °C in a nitrogen atmosphere. Addition of 3 to 9 wt% of coke breeze into filter cake enhanced the zinc removal to 60.6 to 91.4%, …

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Vibration Control Of A Tunnel Boring Machine Using Adaptive Magnetorheological Damper, Bo Yang, Shuaishuai Sun, Lei Deng, Tianhe Jin, Weihua Li, He Li Jan 2019

Vibration Control Of A Tunnel Boring Machine Using Adaptive Magnetorheological Damper, Bo Yang, Shuaishuai Sun, Lei Deng, Tianhe Jin, Weihua Li, He Li

Faculty of Engineering and Information Sciences - Papers: Part B

With a large number of tunnel boring machines (TBM) being used in various tunnel constructions, the vibration problem under complex geological conditions have become increasingly prominent. In order to solve the problem, this article investigates the application of an adaptive magnetorheological (MR) damper on the vibration reduction of a TBM. The MR damper could reduce the horizontal vibration of the TBM system and adjust its dragging force on the propulsive system under different geological conditions. The MR damper can also provide large enough damping force even under a small amplitude vibration, which is required by TBM. In this paper, an …

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Effect Of Hot Isostatic Pressing On The Mechanical Properties Of Aluminium Metal Matrix Nanocomposites Produced By Dual Speed Ball Milling, Saud Almotairy, Alireza Fadavi Boostani, M Hassani, D Wei, Zhengyi Jiang Jan 2019

Effect Of Hot Isostatic Pressing On The Mechanical Properties Of Aluminium Metal Matrix Nanocomposites Produced By Dual Speed Ball Milling, Saud Almotairy, Alireza Fadavi Boostani, M Hassani, D Wei, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

2019 The Authors. In this study a suggested model for flake powder metallurgy were implemented and its mechanism was explained. The suggested model includes dual-speed ball milling (DSBM) to take the advantage of the low-speed and high-speed ball milling (LSBM and HSBM). The modelled process was utilised to uniformly disperse SiC nanoparticles into aluminium metal matrix to produce nanocomposites. The produced mixed powder was hot isostatically pressed. The effects of processing parameters such as stearic acid content, SiC volume content, ball milling speed and time on the microstructure and consequently tensile properties of the manufactured composites have been investigated experimentally …

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Effect Of Heat Input On Weld Formation And Tensile Properties In Keyhole Mode Tig Welding Process, Zhenyu Fei, Zengxi Stephen Pan, Dominic Cuiuri, Hui Jun Li, Bintao Wu, Donghong Ding, Lihong Su Jan 2019

Effect Of Heat Input On Weld Formation And Tensile Properties In Keyhole Mode Tig Welding Process, Zhenyu Fei, Zengxi Stephen Pan, Dominic Cuiuri, Hui Jun Li, Bintao Wu, Donghong Ding, Lihong Su

Faculty of Engineering and Information Sciences - Papers: Part B

2019 by the authors. Licensee MDPI, Basel, Switzerland. Keyhole mode Tungsten Inert Gas (K-TIG) welding is a novel advanced deep penetration welding technology which provides an alternative to high power density welding in terms of achieving keyhole mode welding. In order to facilitate welding procedure optimisation in this newly developed welding technology, the relationship among welding parameters, weld formation and tensile properties during the K-TIG welding was investigated in detail. Results show that except for travel speed, the heat input level also plays an important role in forming undercut defect by changing the plasma jet trajectory inside keyhole channel, leading …

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From Regional To Global Brain: A Novel Hierarchical Spatial-Temporal Neural Network Model For Eeg Emotion Recognition, Yang Li, Wenming Zheng, Lei Wang, Yuan Zong, Zhen Cui Jan 2019

From Regional To Global Brain: A Novel Hierarchical Spatial-Temporal Neural Network Model For Eeg Emotion Recognition, Yang Li, Wenming Zheng, Lei Wang, Yuan Zong, Zhen Cui

Faculty of Engineering and Information Sciences - Papers: Part B

IEEE In this paper, we propose a novel Electroencephalograph (EEG) emotion recognition method inspired by neuroscience with respect to the brain response to different emotions. The proposed method, denoted by R2G-STNN, consists of spatial and temporal neural network models with regional to global hierarchical feature learning process to learn discriminative spatial-temporal EEG features. To learn the spatial features, a bidirectional long short term memory (BiLSTM) network is adopted to capture the intrinsic spatial relationships of EEG electrodes within brain region and between brain regions, respectively. Considering that different brain regions play different roles in the EEG emotion recognition, a region-attention …

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Helping An Agent Reach A Different Goal By Action Transfer In Reinforcement Learning, Yuchen Wang, Fenghui Ren, Minjie Zhang Jan 2019

Helping An Agent Reach A Different Goal By Action Transfer In Reinforcement Learning, Yuchen Wang, Fenghui Ren, Minjie Zhang

Faculty of Engineering and Information Sciences - Papers: Part B

© 2019, Springer Nature Switzerland AG. Reinforcement learning agents can be helped by the knowledge transferred from experienced agents. This paper studies the problem of how an experienced agent helps another agent learn when they have different learning goals by action transfer. This problem is motivated by the widely existing situations where agents have different learning goals and only action transfer is available to agents. To tackle the problem, we propose an approach to facilitate the transfer of actions that are right to a learning agent’s goal. Experimental results show the effectiveness of the proposed approach in transferring right actions …

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Using Freivalds’ Algorithm To Accelerate Lattice-Based Signature Verifications, Arnaud Sipasseuth, Thomas Plantard, Willy Susilo Jan 2019

Using Freivalds’ Algorithm To Accelerate Lattice-Based Signature Verifications, Arnaud Sipasseuth, Thomas Plantard, Willy Susilo

Faculty of Engineering and Information Sciences - Papers: Part B

© Springer Nature Switzerland AG, 2019. We present a novel computational technique to check whether a matrix-vector product is correct with a relatively high probability. While the idea could be related to verifiable delegated computations, most of the literature in this line of work focuses on provably secure functional aspects and do not provide clear computational techniques to verify whether a product $$xA = y$$ is correct where x, A and y are not given nor computed by the party which requires validity checking: this is typically the case for some cryptographic lattice-based signature schemes. This paper focuses on the …

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Soi Thin Microdosimeters For High Let Single Event Upset Studies In Fe, O, Xe And Cocktail Ion Beam Fields, Benjamin James, Linh T. Tran, David Bolst, Stefania Peracchi, Jeremy A. Davis, Dale A. Prokopovich, Susanna Guatelli, Marco Petasecca, Michael L. F Lerch, Marco Povoli, Angela Kok, Marc Goethem, Mitchell John Bromley Nancarrow, Naruhiro Matsufuji, Michael A. Jackson, Anatoly B. Rosenfeld Jan 2019

Soi Thin Microdosimeters For High Let Single Event Upset Studies In Fe, O, Xe And Cocktail Ion Beam Fields, Benjamin James, Linh T. Tran, David Bolst, Stefania Peracchi, Jeremy A. Davis, Dale A. Prokopovich, Susanna Guatelli, Marco Petasecca, Michael L. F Lerch, Marco Povoli, Angela Kok, Marc Goethem, Mitchell John Bromley Nancarrow, Naruhiro Matsufuji, Michael A. Jackson, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part B

The response of a 5 lm thin silicon on insulator (SOI) 3D microdosimeter was investigated for single event upset applications by measuring the LET of different high LET ions. The charge collection characteristics of the device was performed using the Ion Beam Induced Charge collection (IBIC) technique with 3 and 5.5 MeV He2+ ions incident on the microdosimeter. The microdosimeter was irradiated with 16O, 56Fe and 124Xe ions and was able to determine the LET within 5% for most configurations apart from 124Xe. It was observed that on average, measured LET was 12% lower for 30 MeV/u 124Xe ion traversing …

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Validation Of A Monte Carlo Simulation For Microbeam Radiation Therapy On The Imaging And Medical Beamline At The Australian Synchrotron, Andrew Dipuglia, Matthew Cameron, Jeremy A. Davis, Iwan Cornelius, Andrew W. Stevenson, Anatoly B. Rosenfeld, Marco Petasecca, Stephanie Corde, Susanna Guatelli, Michael L. F Lerch Jan 2019

Validation Of A Monte Carlo Simulation For Microbeam Radiation Therapy On The Imaging And Medical Beamline At The Australian Synchrotron, Andrew Dipuglia, Matthew Cameron, Jeremy A. Davis, Iwan Cornelius, Andrew W. Stevenson, Anatoly B. Rosenfeld, Marco Petasecca, Stephanie Corde, Susanna Guatelli, Michael L. F Lerch

Faculty of Engineering and Information Sciences - Papers: Part B

Microbeam Radiation Therapy (MRT) is an emerging cancer treatment modality characterised by the use of high-intensity synchrotron-generated x-rays, spatially fractionated by a multi-slit collimator (MSC), to ablate target tumours. The implementation of an accurate treatment planning system, coupled with simulation tools that allow for independent verification of calculated dose distributions are required to ensure optimal treatment outcomes via reliable dose delivery. In this article we present data from the first Geant4 Monte Carlo radiation transport model of the Imaging and Medical Beamline at the Australian Synchrotron. We have developed the model for use as an independent verification tool for experiments …

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Characterization Of The Mixed Radiation Field Produced By Carbon And Oxygen Ion Beams Of Therapeutic Energy: A Monte Carlo Simulation Study, C Ying, David Bolst, Anatoly B. Rosenfeld, Susanna Guatelli Jan 2019

Characterization Of The Mixed Radiation Field Produced By Carbon And Oxygen Ion Beams Of Therapeutic Energy: A Monte Carlo Simulation Study, C Ying, David Bolst, Anatoly B. Rosenfeld, Susanna Guatelli

Faculty of Engineering and Information Sciences - Papers: Part B

2019 Wolters Kluwer Medknow Publications. All rights reserved. Purpose: The main advantages of charged particle radiotherapy compared to conventional X-ray external beam radiotherapy are a better tumor conformality coupled with the capability of treating deep-seated radio-resistant tumors. This work investigates the possibility to use oxygen beams for hadron therapy, as an alternative to carbon ions. Materials and Methods: Oxygen ions have the advantage of a higher relative biological effectiveness (RBE) and better conformality to the tumor target. This work describes the mixed radiation field produced by an oxygen beam in water and compares it to the one produced by a …

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Bearing Corrosion Failure Diagnosis Of Doubly-Fed Induction Generator In Wind Turbines Based On Stator Current Analysis, Xi Chen, Wei Xu, Yi Liu, Md Rabiul Islam Jan 2019

Bearing Corrosion Failure Diagnosis Of Doubly-Fed Induction Generator In Wind Turbines Based On Stator Current Analysis, Xi Chen, Wei Xu, Yi Liu, Md Rabiul Islam

Faculty of Engineering and Information Sciences - Papers: Part B

IEEE Bearing failure often occurs in doubly-fed induction generator (DFIG)-based wind turbines which are usually subject to electrical corrosion effects. Fault diagnosis method based on electrical signals has been paid much attention as the method is non-invasive and cost-effective. This paper describes the use of the modulation signal bispectrum (MSB) detector for diagnosing bearing faults in DFIGs of wind turbines. The major theoretical principles involved with the MSB method are presented and it is shown how the amplitude and phase relationships of the stator current signals caused by torque oscillations can be effectively revealed. Since the MSB result is obtained …

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A Numerical Approach To Design The Kretschmann Configuration Based Refractive Index Graphene-Mos2 Hybrid Layers With Tio2-Sio2 Nano For Formalin Detection, Md. Biplob Hossain, Tamanna Tasnim, Lway Abdulrazak, Md Masud Rana, Md Rabiul Islam Jan 2019

A Numerical Approach To Design The Kretschmann Configuration Based Refractive Index Graphene-Mos2 Hybrid Layers With Tio2-Sio2 Nano For Formalin Detection, Md. Biplob Hossain, Tamanna Tasnim, Lway Abdulrazak, Md Masud Rana, Md Rabiul Islam

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, a Kretschmann configuration based surface plasmon resonance (SPR) sensor is numerically designed using graphene-MoS2 hybrid structure TiO2-SiO2 nano particles for formalin detection. In this design, the observations of SPR angle versus minimum reflectance and SPR frequency (FSPR) versus maximum transmittance (Tmax) are considered. The chitosan is used as probe legend to perform reaction with the formalin (40% formaldehyde) which acts as target legend. In this paper, both graphene and MoS2 are used as biomolecular acknowledgment element (BAE) and TiO2 as well as SiO2 bilayers is used to improve the sensitivity of the sensor. The numerical results show …

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Through-The-Wall Target Separation Using Low-Rank And Variational Mode Decomposition, Fok Hing Chi Tivive, Abdesselam Bouzerdoum Jan 2019

Through-The-Wall Target Separation Using Low-Rank And Variational Mode Decomposition, Fok Hing Chi Tivive, Abdesselam Bouzerdoum

Faculty of Engineering and Information Sciences - Papers: Part B

1980-2012 IEEE. Through-the-wall radar imaging (TWRI) is a sensing technology that can be used for detecting, locating, and identifying targets inside enclosed building structures. Many of the existing target classification approaches focus on single-target scene. For multi-target classification, the radar signal has to be segregated into different target components. However, target separation in TWRI is a challenging problem since the radar signals consist of both strong wall reflections and weak target echoes. Furthermore, the target signals are attenuated and distorted when propagating through the wall. In this paper, a variational model with low-rank constraint is proposed for decomposing the radar …

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Carbon Nanotube And Graphene Fiber Artificial Muscles, Javad Foroughi, Geoffrey M. Spinks Jan 2019

Carbon Nanotube And Graphene Fiber Artificial Muscles, Javad Foroughi, Geoffrey M. Spinks

Faculty of Engineering and Information Sciences - Papers: Part B

2019 The Royal Society of Chemistry. Actuator materials capable of producing a rotational or tensile motion are rare and, yet, rotary systems are extensively utilized in mechanical systems like electric motors, pumps, turbines and compressors. Rotating elements of such machines can be rather complex and, therefore, difficult to miniaturize. Rotating action at the microscale, or even nanoscale, would benefit from the direct generation of torsion from an actuator material. Herein we discuss the advantages of using carbon nanotube (CNT) yarns and/or graphene (G) fibers as novel artificial muscles that have the ability to be driven by the electrochemical charging of …

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Analog Least Mean Square Loop For Self-Interference Cancellation In In-Band Full-Duplex Systems, Anh Tuyen Le, Le Chung Tran, Xiaojing Huang, Y. Jay Guo Jan 2019

Analog Least Mean Square Loop For Self-Interference Cancellation In In-Band Full-Duplex Systems, Anh Tuyen Le, Le Chung Tran, Xiaojing Huang, Y. Jay Guo

Faculty of Engineering and Information Sciences - Papers: Part B

Analog Least Mean Square (ALMS) loop is a promising method to cancel self-interference (SI) in in-band full-duplex (IBFD) systems. In this talk, the steady state analyses of the residual SI powers in both analog and digital domains are derived in frequency domain. It is proved that the ALMS loop amplifies the frequency components of the residual SI at the edges of the signal spectrum in the analog domain, but the matched filter in the receiver chain reduces this effect. This results in a significant improvement of the interference suppression ratio in the digital domain before information data detection. The lower …

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Scattering Transform Framework For Unmixing Of Hyperspectral Data, Yiliang Zeng, Christian H. Ritz, Jiahong Zhao, Jinhui Lan Jan 2019

Scattering Transform Framework For Unmixing Of Hyperspectral Data, Yiliang Zeng, Christian H. Ritz, Jiahong Zhao, Jinhui Lan

Faculty of Engineering and Information Sciences - Papers: Part B

2019 by the authors. The scattering transform, which applies multiple convolutions using known filters targeting different scales of time or frequency, has a strong similarity to the structure of convolution neural networks (CNNs), without requiring training to learn the convolution filters, and has been used for hyperspectral image classification in recent research. This paper investigates the application of the scattering transform framework to hyperspectral unmixing (STFHU). While state-of-the-art research on unmixing hyperspectral data utilizing scattering transforms is limited, the proposed end-to-end method applies pixel-based scattering transforms and preliminary three-dimensional (3D) scattering transforms to hyperspectral images in the remote sensing scenario …

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A Method For Dynamic 3d Shape Measurements Based On Multiple-Shot Ftp And Motion Compensation, Chengpu Duan, Jun Tong, Jiangtao Xi, Yiwei Zhang, Yanguang Yu, Qinghua Guo, Lei Lu Jan 2019

A Method For Dynamic 3d Shape Measurements Based On Multiple-Shot Ftp And Motion Compensation, Chengpu Duan, Jun Tong, Jiangtao Xi, Yiwei Zhang, Yanguang Yu, Qinghua Guo, Lei Lu

Faculty of Engineering and Information Sciences - Papers: Part B

2019 SPIE. Fringe projection profilometry (FPP) has attracted considerable interests for addressing the challenge of measuring three-dimension (3D) shapes of moving objects. Compared with phase shift profilometry (PSP) which requires the capture of multiple fringe patterns and is thus only suitable for static objects, Fourier transform profilometry (FTP) is less sensitive to motion-induced errors. However, FTP is prone to the influence of background lights and variations of the surface reflectivity, which may result in less accurate measurements. There are studies aimed to reduce the measurement errors with FTP using more sophisticated processing of the fringe patterns. However, existing works focus …

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Experimental Investigations Of Stress-Gas Pressure Evolution Rules Of Coal And Gas Outburst: A Case Study In Dingji Coal Mine, China, Bo Zhao, Jie Cao, Haitao Sun, Guangcai Wen, Linchao Dai, Bo-Chu Wang Jan 2019

Experimental Investigations Of Stress-Gas Pressure Evolution Rules Of Coal And Gas Outburst: A Case Study In Dingji Coal Mine, China, Bo Zhao, Jie Cao, Haitao Sun, Guangcai Wen, Linchao Dai, Bo-Chu Wang

Faculty of Engineering and Information Sciences - Papers: Part B

Coal and gas outburst is a potentially fatal risk during the mining of gassy coal seams, which seriously threatens the safe mining of collieries. To understand the outburst mechanism and evolution rules, a new apparatus (LSTT) was developed to conduct simulated experiment. In the context of an outburst accident in Dingji coal mine, the authors launched an authentic outburst experiment to replay the outburst accident. Experimental apparatus, similar criterion, coal‐like materials and gas sources, and experimental design were discussed systematically in this paper. Experimentally, the study analyzed the geo‐stress has significant influence on the outburst evolution. At the driving face, …

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Creep Characteristics And Constitutive Model Of Coal Under Triaxial Stress And Gas Pressure, Liang Zhang, Xiangchun Li, Jia-Xing Gao, Zhen-Xing An, Xiaohan Yang, Baisheng Nie Jan 2019

Creep Characteristics And Constitutive Model Of Coal Under Triaxial Stress And Gas Pressure, Liang Zhang, Xiangchun Li, Jia-Xing Gao, Zhen-Xing An, Xiaohan Yang, Baisheng Nie

Faculty of Engineering and Information Sciences - Papers: Part B

Creep behavior is one of the most important mechanical behaviors of coal. In the present study, we systematically carried out a series of creep experiments of briquette samples under triaxial compression and gas pressure. The experimental results showed that the creep deformation characteristics of coal were related to deviatoric stress and gas pressure. The accelerating creep stage initiated when the deviatoric stress reached or exceeded the yield stress until failure took place. In contrast, when the deviatoric stress was less than the yield strength, only transient and steady creep stage occurred. Besides, gas pressure played a positive role in the …

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Effect Of Geogrid Reinforcement On The Drying Shrinkage And Thermal Expansion Of Geopolymer Concrete, Abbas Sahib Abd-Ali Al-Hedad, Nabeel Farhan, Mengying Zhang, M Neaz Sheikh, Muhammad N. S Hadi Jan 2019

Effect Of Geogrid Reinforcement On The Drying Shrinkage And Thermal Expansion Of Geopolymer Concrete, Abbas Sahib Abd-Ali Al-Hedad, Nabeel Farhan, Mengying Zhang, M Neaz Sheikh, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

2019 fib. International Federation for Structural Concrete The effect of triaxial geogrid reinforcement on the thermal expansion and drying shrinkage of geopolymer concrete (GPC) was experimentally investigated. Three groups of GPC prism specimens with a length of 280 mm and a cross-section of 75 mm x 75 mm were prepared and tested in this study. The first group included six unreinforced GPC specimens and was considered as the control group of specimens. The second group included six GPC specimens reinforced with one layer of geogrid. The third group included six GPC specimens reinforced with two layers of geogrid. The triaxial …

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High-Performance K-Co2 Batteries Based On Metal-Free Carbon Electrocatalysts, Wenchao Zhang, Chuangang Hu, Zaiping Guo, Liming Dai Jan 2019

High-Performance K-Co2 Batteries Based On Metal-Free Carbon Electrocatalysts, Wenchao Zhang, Chuangang Hu, Zaiping Guo, Liming Dai

Faculty of Engineering and Information Sciences - Papers: Part B

2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Metal-CO2 batteries have attracted much attention owing to their high energy density and use of greenhouse CO2 waste as the energy source. However, the increasing cost of lithium and the low discharge potential of Na-CO2 batteries create obstacles for practical applications of Li/Na-CO2 batteries. Recently, earth-abundant potassium ions have attracted considerable interest as fast ionic charge carriers for electrochemical energy storage. Herein, we report the first K-CO2 battery with a carbon-based metal-free electrocatalyst. The battery shows a higher theoretical discharge potential (E⊖=2.48 V) than that of Na-CO2 batteries (E⊖=2.35 V) and can …

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