A New Shock-Wave Test Apparatus For Liquid Co2 Blasting And Measurement Analysis,
2019
Liaoning Technical University
A New Shock-Wave Test Apparatus For Liquid Co2 Blasting And Measurement Analysis, Ying Chen, Hongwei Zhang, Zhijie Zhu, Ting X. Ren, Chen Cao, Feng Zhu, Yunpeng Li
Faculty of Engineering and Information Sciences - Papers: Part B
Liquid CO 2 blasting of coal or rock body technology is widely used for improving permeability, pressure relief, cutting proof, and roadway development. Due to the lack of proper apparatus for blasting measurement, the determination of blasting parameters is often not under scientific basis. A newly designed experimental apparatus is developed to monitor shock-wave pressure of liquid CO 2 blasting. The apparatus mainly consists of testing tube and base bracket. The testing tube is fixed on the base bracket by fixed ring. The base bracket is fixed to the ground by expansion bolts to ensure the stability of the apparatus …
A Theoretical Model For Total Suction Effects By Tree Roots,
2019
University of Wollongong
A Theoretical Model For Total Suction Effects By Tree Roots, Udeshini Pathirage, Buddhima Indraratna, Muditha Pallewattha, Ana Heitor
Faculty of Engineering and Information Sciences - Papers: Part B
Strengthening soft and weak soil by way of root reinforcement is a well-known strategy that is adopted worldwide. In Australia, native gum trees remain evergreen throughout the year and have been utilised to stabilise transportation corridors by way of reinforcement provided by the roots and the suction generated within the root domain as a function of evapotranspiration through the canopy. A mature gum tree can induce a missive total suction pressure exceeding 30MPa through its root water and solute uptake in terms of matric plus osmotic suction. This cumulative effect of matric and osmotic suctions contributes to the overall shear …
Nonlinear Post-Fire Simulation Of Concentrically Loaded Rectangular Thin-Walled Concrete-Filled Steel Tubular Short Columns Accounting For Progressive Local Buckling,
2019
Victoria University
Nonlinear Post-Fire Simulation Of Concentrically Loaded Rectangular Thin-Walled Concrete-Filled Steel Tubular Short Columns Accounting For Progressive Local Buckling, Ghanim Mohammed Kamil, Qing Quan Liang, Muhammad N. S Hadi
Faculty of Engineering and Information Sciences - Papers: Part B
The repair of fire-damaged thin-walled rectangular concrete-filled steel tubular (CFST) columns in engineering structures after fire exposure requires the assessment of their residual strength and stiffness. Existing numerical models have not accounted for the effects of local buckling on the post-fire behavior of CFST columns with rectangular thin-walled sections. This paper describes a nonlinear post-fire simulation technique underlying the theory of fiber analysis for determining the residual strengths and post-fire responses of concentrically loaded short thin-walled rectangular CFST columns accounting for progressive local buckling. The post-fire stress-strain laws for concrete in rectangular CFST columns are proposed based on available test …
Public Key Authenticated Encryption With Designated Equality Test And Its Applications In Diagnostic Related Groups,
2019
South China Agricultural University
Public Key Authenticated Encryption With Designated Equality Test And Its Applications In Diagnostic Related Groups, Yuanhao Wang, Qiong Huang, Hongbo Li, Jianye Huang, Guomin Yang, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part B
Due to the massive growth of data and security concerns, data of patients would be encrypted and outsourced to the cloud server for feature matching in various medical scenarios, such as personal health record systems, actuarial judgements and diagnostic related groups. Public key encryption with equality test (PKEET) is a useful utility for encrypted feature matching. Authorized tester could perform data matching on encrypted data without decrypting. Unfortunately, due to the limited terminology in medicine, people within institutions may illegally use data, trying to obtain information through traversal methods. In this paper we propose a new PKEET notion, called public-key …
Performance Analysis Of Heat Pump Dryer With Unit-Room In Cold Climate Regions,
2019
University of Chinese Academy of Sciences, Chinese Academy Of Sciences
Performance Analysis Of Heat Pump Dryer With Unit-Room In Cold Climate Regions, Ya Yuan, Wenye Lin, Xiang Mao, Weizhao Li, Luwei Yang, Juan Wei, Bo Xiao
Faculty of Engineering and Information Sciences - Papers: Part B
This study presents the development and evaluation of a novel partially open-loop heat pump dryer with a unit-room (HPDU). The unit-room was designed to enable the ambient air to be mixed with the return air, thereby reducing the influence of the ambient air on the system performance, while maintaining a high system thermal efficiency. A modelling system for the HPDU was developed and validated based on a real-scale experimental study. By using the modelling system, the system characteristics under different ambient conditions and bypass factors were analyzed. The energy benefit of the proposed HPDU was quantified through a comparative study …
A Review Of Heat And Mass Transfer Improvement Techniques For Dehumidifiers And Regenerators Of Liquid Desiccant Cooling Systems,
2019
University of Wollongong
A Review Of Heat And Mass Transfer Improvement Techniques For Dehumidifiers And Regenerators Of Liquid Desiccant Cooling Systems, Haoshan Ren, Zhenjun Ma, Jingjing Liu, Xuemei Gong, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part B
Liquid desiccant cooling is being considered as an alternative to vapour compression air conditioning systems and has been extensively investigated in recent decades. The dehumidifiers and regenerators are the key components of liquid desiccant cooling systems and their heat and mass transfer performance significantly influences the performance of liquid desiccant cooling systems. This paper provides an overview of heat and mass transfer improvement techniques used to enhance the performance of direct-contact and indirect-contact dehumidifiers and regenerators used in liquid desiccant cooling systems. A number of techniques such as using a third heat transfer fluid, selection of packing materials, and tube …
Analytically Pricing Credit Default Swaps Under A Regime-Switching Model,
2019
Jiangnan University
Analytically Pricing Credit Default Swaps Under A Regime-Switching Model, Wenting Chen, Xinjiang He, Xinzi Qiu
Faculty of Engineering and Information Sciences - Papers: Part B
In this paper, we consider the valuation of a CDS (credit default swap) contract when the reference asset is assumed to follow a regime-switching model with the volatility allowed to jump among different states. Our motivation originates from empirical evidence demonstrating the existence of regime-switching in real markets. The default probability is analytically derived first, based on which a closed-form formula for the CDS price is obtained so that it can be easily implemented for practical purposes. Finally, numerical experiments are carried out to show quantitatively some properties of the CDS price under the regime-switching model.
Reconstructing Directed Graphs From Generalized Gauge Actions On Their Toeplitz Algebras,
2019
University of Sydney
Reconstructing Directed Graphs From Generalized Gauge Actions On Their Toeplitz Algebras, Nathan D. Brownlowe, Marcelo Laca, David I. Robertson, Aidan Sims
Faculty of Engineering and Information Sciences - Papers: Part B
We show how to reconstruct a finite directed graph E from its Toeplitz algebra, its gauge action, and the canonical finite-dimensional abelian subalgebra generated by the vertex projections. We also show that if E has no sinks, then we can recover E from its Toeplitz algebra and the generalized gauge action that has, for each vertex, an independent copy of the circle acting on the generators corresponding to edges emanating from that vertex. We show by example that it is not possible to recover E from its Toeplitz algebra and gauge action alone.
Marginal Maximum Likelihood Estimation Of Conditional Autoregressive Models With Missing Data,
2019
University of Wollongong
Marginal Maximum Likelihood Estimation Of Conditional Autoregressive Models With Missing Data, Thomas F. Suesse, Andrew Zammit-Mangion
Faculty of Engineering and Information Sciences - Papers: Part B
Maximum likelihood (ML) estimation of spatial autocorrelation models is well established for the case where each node in the graph is directly observed. When one or more nodes are not observed, the user has a variety of computational tools at her or his disposal ranging from the expectation-maximization algorithm, which has become a standard for missing‐data problems, to marginal likelihood estimation methods and to fully Bayesian approaches. In this article, we give a comprehensive overview of likelihood‐based computational frameworks for parameter estimation of the conditional autoregressive model, and we establish connections with several algorithms in the literature that are iterative …
A 3d-Printed Omni-Purpose Soft Gripper,
2019
University of Wollongong
A 3d-Printed Omni-Purpose Soft Gripper, Charbel Tawk, Andrew Gillett, Marc In Het Panhuis, Geoffrey M. Spinks, Gursel Alici
Faculty of Engineering and Information Sciences - Papers: Part B
Numerous soft grippers have been developed based on smart materials, pneumatic soft actuators, and underactuated compliant structures. In this article, we present a three-dimensional (3-D) printed omni-purpose soft gripper (OPSOG) that can grasp a wide variety of objects with different weights, sizes, shapes, textures, and stiffnesses. The soft gripper has a unique design that incorporates soft fingers and a suction cup that operate either separately or simultaneously to grasp specific objects. A bundle of 3-D-printable linear soft vacuum actuators (LSOVA) that generate a linear stroke upon activation is employed to drive the tendon-driven soft fingers. The support, fingers, suction cup, …
Measurement And Prediction Of Granite Damage Evolution In Deep Mine Seams Using Acoustic Emission,
2019
Taiyuan University of Technology
Measurement And Prediction Of Granite Damage Evolution In Deep Mine Seams Using Acoustic Emission, Sunwen Du, Guorui Feng, Zhixiong Li, T Sarkodie-Gyan, Jianmin Wang, Zhenjun Ma, Weihua Li
Faculty of Engineering and Information Sciences - Papers: Part B
With unceasing increase of mining depth and development intensity, mining disasters such as rock burst have been increasing frequently, which often result in catastrophic accidents. Therefore, it is imperative to accurately forecast underground disasters. Previous research has suggested that the combination of drill-hole pressure relief and acoustic emission (AE) monitoring serves as an effective measure method towards the forecasting and prevention of disastrous accidents. However, the AE evolution mechanism of underground rock damages remains a challenge; more specifically, the relationships among the drilling hole positions, depths and diameters, and the stress-strain and AE characteristics of the rocks are discussed little …
Thermal Comfort In A Mixed-Mode Building: Are Occupants More Adaptive?,
2019
University of Sydney
Thermal Comfort In A Mixed-Mode Building: Are Occupants More Adaptive?, Jungsoo Kim, Federico Tartarini, Thomas Parkinson, Paul Cooper, Richard De Dear
Faculty of Engineering and Information Sciences - Papers: Part B
Mixed-mode (MM) ventilation approaches are becoming increasingly popular as a more energy efficient alternative to conventional HVAC solutions. By integrating both natural ventilation and mechanical cooling strategies, mixed-mode (or hybrid) building operation is able to achieve comfortable indoor environments whilst minimising reliance on energy intensive HVAC systems. This study investigated how different modes of operation in a mixed-mode building - air-conditioning (AC) and natural ventilation (NV) - affect indoor thermal environmental conditions and occupant perceptions of thermal comfort. Longitudinal field observations were made in a mixed-mode building located in subtropical climate area of Australia. Continuous indoor environmental quality (IEQ) data …
Pumped Hydro Using The Downstream River Channel For Time Shifting Storage,
2019
Solid Pumped Hydro Energy Storage
Pumped Hydro Using The Downstream River Channel For Time Shifting Storage, Saugato Mukerji, Peter Gibson
Faculty of Engineering and Information Sciences - Papers: Part B
The surge of Renewable Energy (RE) and particularly Solar PV in the journey to replace fossil fuels, is producing excess energy that is way more than the demand on sunny days. The visible network demand too is getting reduced by behind the meter installed residential PV. This is leading to energy prices approaching close to zero and even negative in sunny parts of the day.The lack of demand is leading to widespread curtailment of RE. This near free energy is creating opportunities for lower round trip efficiency storage options. Pumped hydro energy storage(PHES) operates between two reservoirs by pumping from …
Ventilative Cooling Potential Of Buildings In Australia,
2019
University of Wollongong
Ventilative Cooling Potential Of Buildings In Australia, Federico Tartarini, Massimo Fiorentini, Laia Ledo Gomis, Paul Cooper
Faculty of Engineering and Information Sciences - Papers: Part B
The demand for space cooling is the fastest growing end-use of electricity in buildings since many rely on the use of air-conditioners only to control the indoor climate. Ventilative cooling is a passive cooling technique, which involves the use of outdoor air to lower buildings' indoor air temperature. In order to determine whether ventilative cooling may have the ability to reduce cooling loads, a detailed analysis of the local climate is needed. The aim of this study was to identify which Australian geographical regions have a suitable climate for the utilization of ventilative cooling techniques. The assessment of climatic potential …
Cooperative Secondary Voltage Control Of Static Converters In A Microgrid Using Model-Free Reinforcement Learning,
2019
University of Wollongong
Cooperative Secondary Voltage Control Of Static Converters In A Microgrid Using Model-Free Reinforcement Learning, Edward Smith, Duane A. Robinson, Ashish P. Agalgaonkar
Faculty of Engineering and Information Sciences - Papers: Part B
Agent-based secondary voltage regulation in an islanded MicroGrid is complicated by non-linear system dynamics, state couplings and uncertain communication network topology information. This paper proposes an off-policy learning algorithm for cooperative secondary voltage control which can synthesize an optimal feedback controller in real-time without knowledge of the system model. A simulation model has been developed using MATLAB/Simulink, which demonstrates a working controller. Results from the simulations are included, and practical considerations regarding implementation on a real system discussed.
Error Compensation Method Of Large Size Steel Sheet Measurement Based On Control Field,
2019
Tianjin Polytechnic University
Error Compensation Method Of Large Size Steel Sheet Measurement Based On Control Field, Lei Geng, Fucai Yao, Wen Wang, Jiangtao Xi, Yaru Li
Faculty of Engineering and Information Sciences - Papers: Part B
Aiming at the problem of low accuracy of large size sheet edge, a method of sheet size error measurement based on control field is proposed. Firstly, an error compensation model of the measuring system based on control field is established by analyzing the causes of the errors of the measuring system. A grid standard plate is designed and the error distribution on the grid line is obtained by using the measurement results of the standard plate. Secondly, the error curve is established according to the distribution, and the trig function theorem is used to project the curve into the image …
Theoretical Study On Positron Scattering By Benzene Over A Broad Energy Range,
2019
Federal University of Parana
Theoretical Study On Positron Scattering By Benzene Over A Broad Energy Range, Alessandra Souza Barbosa, Francisco Blanco, Gustavo Garcia, Marcio H. F. Bettega
Faculty of Engineering and Information Sciences - Papers: Part B
In this paper two theoretical methodologies, the Schwinger multichannel (SMC) method and the independent atom model with the screening corrected additivity rule (IAM-SCAR), were employed to study positron scattering by benzene over a broad impact energy range. The SMC calculations were carried out in the static plus polarization approximation, accounting for the elastic channel, for impact energies up to 20 eV. The IAM-SCAR method covered energies up to 1000 eV to provide total, elastic, ionization, excitation, and positronium formation cross sections. In the low-energy region we discuss how the description of the polarization effects affects the cross sections. In particular, …
Towards A General Prediction System For The Primary Delay In Urban Railways,
2019
University of Wollongong
Towards A General Prediction System For The Primary Delay In Urban Railways, Jianqing Wu, Luping Zhou, Chen Cai, Fang Dong, Jun Shen, Geng Sun
Faculty of Engineering and Information Sciences - Papers: Part B
Nowadays a large amount of data is collected from sensor devices across the cyber-physical networks. Accurate and reliable primary delay predictions are essential for rail operations management and planning. However, very few existing 'big data' methods meet the specific needs in railways. We propose a comprehensive and general data-driven Primary Delay Prediction System (PDPS) framework, which combines General Transit Feed Specification (GTFS), Critical Point Search (CPS), and deep learning models to leverage the data fusion. Based on this framework, we have also developed an open source data collection and processing tool that reduces the barrier to the use of the …
Large Expert-Curated Database For Benchmarking Document Similarity Detection In Biomedical Literature Search,
2019
Griffith University
Large Expert-Curated Database For Benchmarking Document Similarity Detection In Biomedical Literature Search, Peter Brown, Relish Consortium, Yaoqi Zhou
Faculty of Engineering and Information Sciences - Papers: Part B
Document recommendation systems for locating relevant literature have mostly relied on methods developed a decade ago. This is largely due to the lack of a large offline gold-standard benchmark of relevant documents that cover a variety of research fields such that newly developed literature search techniques can be compared, improved and translated into practice. To overcome this bottleneck, we have established the RElevant LIterature SearcH consortium consisting of more than 1500 scientists from 84 countries, who have collectively annotated the relevance of over 180 000 PubMed-listed articles with regard to their respective seed (input) article/s. The majority of annotations were …
Numerical Analysis Of Behavior Of Glass Fiber-Reinforced Polymer Bar-Reinforced Concrete Beams Under Impact Loads,
2019
University of Wollongong
Numerical Analysis Of Behavior Of Glass Fiber-Reinforced Polymer Bar-Reinforced Concrete Beams Under Impact Loads, Zein Saleh, M Neaz Sheikh, Alex M. Remennikov, Abheek Basu
Faculty of Engineering and Information Sciences - Papers: Part B
This paper numerically investigates the behavior of glass fiber-reinforced polymer (GFRP) bar-reinforced concrete beams (GFRP-RC beams) under low-velocity impact loads. A finite element model has been developed and calibrated against the experimental investigation results of six GFRP-RC beams. The results of the numerical analysis have been found in very good agreement with the experimental investigation results. The finite element model captured the failure modes, crack profiles, midspan deflection, impact and reaction forces, and dynamic strain of the GFRP-RC beams. Moreover, a parametric study has been carried out to investigate the influence of the reinforcement ratio, compressive strength of concrete, drop …
