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Articles 2671 - 2700 of 14367

Full-Text Articles in Social and Behavioral Sciences

Modelling Dynamic Fracture Propagation In Rock, Gaetano Venticinque, Jan Nemcik Jan 2017

Modelling Dynamic Fracture Propagation In Rock, Gaetano Venticinque, Jan Nemcik

Faculty of Engineering and Information Sciences - Papers: Part B

Fracture propagation in brittle rock is very fast and highly dynamic. Typically this process consists of fracture initiation, propagation and termination. Growth of micro-fractures is conceptually and numerically well established, however, current practices to model fracture propagation in rock employs slow evolving static regimes that do not represent the true nature of fracture propagation in the laboratory or the field. This paper presents a newly developed numerical approach using Micro-Brittle Dynamics theory to model the propagation of fractures through rock in real time. This work presented here is based on a newly developed Dynamic Rock Fracture Model (DRFM2D ) …

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Investigation Of Velocity Distribution In Open Channel Flows Based On Conditional Average Of Turbulent Structures, Yu Han, Shu-Qing Yang, Muttucumaru Sivakumar, Liu-Chao Qiu Jan 2017

Investigation Of Velocity Distribution In Open Channel Flows Based On Conditional Average Of Turbulent Structures, Yu Han, Shu-Qing Yang, Muttucumaru Sivakumar, Liu-Chao Qiu

Faculty of Engineering and Information Sciences - Papers: Part B

We report the development of a new analytical model similar to the Reynolds-averaged Navier-Stokes equations to determine the distribution of streamwise velocity by considering the bursting phenomenon. It is found that, in two-dimensional (2D) flows, the underlying mechanism of the wake law in 2D uniform flow is actually a result of up/down events. A special experiment was conducted to examine the newly derived analytical model, and good agreement is achieved between the experimental data in the inner region and the model's prediction. The obtained experimental data were also used to examine the DML-Law (dip-modified-log-law), MLW-Law (modified-log-wake law), and CML-Law (Cole's …

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Strength Properties Of Grout For Strata Reinforcement, Naj Aziz, Dean Majoor, Ali Mirza Jan 2017

Strength Properties Of Grout For Strata Reinforcement, Naj Aziz, Dean Majoor, Ali Mirza

Faculty of Engineering and Information Sciences - Papers: Part B

An experimental study was carried out on grout samples prepared from both Stratabinder and BU100 cementitious products. Samples were prepared with various water to grout ratios and tested for uniaxial compressive and shear strength. Triaxial tests were performed on cylindrical samples to determine values for internal friction angle, cohesion and tensile strength. It was found that the water to cement ratio affects the uniaxial compressive and shear strength of grout. The triaxial test indicated that both internal friction angle and cohesion of Stratabinder do not differ significantly from BU100.

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Innovative Approach To Monitoring Coal Pillar Deformation And Roof Movement Using 3d Laser Technology, Vlastimil Kajzar, Radovan Kukutsch, Petr Waclawik, Jan Nemcik Jan 2017

Innovative Approach To Monitoring Coal Pillar Deformation And Roof Movement Using 3d Laser Technology, Vlastimil Kajzar, Radovan Kukutsch, Petr Waclawik, Jan Nemcik

Faculty of Engineering and Information Sciences - Papers: Part B

Monitoring of pillar and roadway deformations is one of the most important issues in geotechnical engineering and mining practice. The use of 3D laser technology is ideal to monitor strata displacements in underground excavations enabling complex spatial data capture of the entire space around monitored pillars including all roof and rib deformation which occurs during the pillar excavation. This method based on repeated scans, can monitor the excavation surface movement ranging from a few mm to more than 600 mm. The 3D laser scanner was used to monitor the coal mine roadways and pillar stability in room and pillar panel …

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Stress State Monitoring In The Surroundings Of The Roadway Ahead Of Longwall Mining, Petr Waclawik, Radovan Kukutsch, Petr Konicek, Jiri Ptacek, Vlastimil Kajzar, Jan Nemcik, Lubomir Stas, Kamil Soucek, Martin Vavro Jan 2017

Stress State Monitoring In The Surroundings Of The Roadway Ahead Of Longwall Mining, Petr Waclawik, Radovan Kukutsch, Petr Konicek, Jiri Ptacek, Vlastimil Kajzar, Jan Nemcik, Lubomir Stas, Kamil Soucek, Martin Vavro

Faculty of Engineering and Information Sciences - Papers: Part B

Accurate knowledge of the stress-strain state of rock mass, not only in their vicinity but also in the wide surroundings of mine workings, is absolutely critical for precise support designing. Investigation of the rock stress is usually carried out by interpretation of the rock mass deformation processes, which can be relatively precisely observed and measured. In order to verify the stress state of the rock mass and changes in it induced by longwall mining, monitoring of changes in the rock mass stress in connection with the mine out of the longwall No. 371 202 was carried out. The seam extracted …

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Double Shear Testing Of Cable Bolts With No Concrete Face Contacts, Haleh Rasekh, Naj Aziz, Ali Mirza, Jan Nemcik, Xuwei Li, Guanyu Yang, Saman Khaleghparast Jan 2017

Double Shear Testing Of Cable Bolts With No Concrete Face Contacts, Haleh Rasekh, Naj Aziz, Ali Mirza, Jan Nemcik, Xuwei Li, Guanyu Yang, Saman Khaleghparast

Faculty of Engineering and Information Sciences - Papers: Part B

A new series of double shear tests were carried out using a newly modified double shear apparatus which prevented contacts between concrete block surfaces during shearing. 13 double shear tests were carried out using 21 mm diameter 19 (9 x 9 x 1) seal construction wire strand cable (also called Superstrand cable), Plain SUMO, Indented SUMO, Spiral MW9 and Plain MW10 cable bolts. These cables were tested subjected to different pretension loads. Concrete blocks with Uniaxial Compressive Strength (UCS) of 40 MPa and Stratabinder grout were used for all the tests to maintain test consistency. The results show that the …

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A Variation Focused Cluster Analysis Strategy To Identify Typical Daily Heating Load Profiles Of Higher Education Buildings, Zhenjun Ma, Rui Yan, Natasa Nord Jan 2017

A Variation Focused Cluster Analysis Strategy To Identify Typical Daily Heating Load Profiles Of Higher Education Buildings, Zhenjun Ma, Rui Yan, Natasa Nord

Faculty of Engineering and Information Sciences - Papers: Part B

This paper presents a variation focused cluster analysis strategy to identify typical daily heating energy usage profiles of higher education buildings. Different from the existing cluster analysis studies which were primarily developed using Euclidean distance as the dissimilarity measure and tended to group the daily load profiles with similar magnitudes, Partitioning Around Medoids (PAM) clustering algorithm with Pearson Correlation Coefficient-based dissimilarity measure was used in this study to group the daily load profiles on the basis of the variation similarity. A comparison of the proposed strategy with a k-means cluster analysis with Euclidean distance as the dissimilarity measure was also …

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Decompression Modelling Of Pipelines Carrying Co2-N2 Mixture And The Influence Of Non-Equilibrium Phase Transition, Bin Liu, Xiong Liu, Cheng Lu, Ajit R. Godbole, Guillaume Michal, Anh Kiet Tieu Jan 2017

Decompression Modelling Of Pipelines Carrying Co2-N2 Mixture And The Influence Of Non-Equilibrium Phase Transition, Bin Liu, Xiong Liu, Cheng Lu, Ajit R. Godbole, Guillaume Michal, Anh Kiet Tieu

Faculty of Engineering and Information Sciences - Papers: Part B

The Carbon Capture and Storage (CCS) is the technology that has been proposed to reduce high concentrations of CO2 in the atmosphere. This method involves transporting the CO2 to the storage site, usually in pipelines. In order to ensure safe transport, the required pipe toughness must be accurately estimated. This, in turn, requires an accurate estimate of the decompression wave speed in the fluid. In this paper, a multi-phase Computational Fluid Dynamics (CFD) model is presented to simulate the decompression of a CO2-N2 mixture in a pipe. A real gas EOS (GERG-2008) was incorporated into …

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Tower Load Analysis Of Offshore Wind Turbines And The Effects Of Aerodynamic Damping, Xiong Liu, Cheng Lu, Gangqiang Li, Ajit R. Godbole, Yan Chen Jan 2017

Tower Load Analysis Of Offshore Wind Turbines And The Effects Of Aerodynamic Damping, Xiong Liu, Cheng Lu, Gangqiang Li, Ajit R. Godbole, Yan Chen

Faculty of Engineering and Information Sciences - Papers: Part B

This study presents an analysis of the loads on offshore Horizontal Axis Wind Turbines (HAWTs). The aerodynamic loads are estimated using the Blade Element-Momentum (BEM) theory, including the effects of dynamic inflow and dynamic stall. The wave loads are calculated using Morison's equation. Models are proposed to account for the effects of aerodynamic damping on the fatigue loading on the tower during its working lifetime. Load analysis of a 5 MW offshore HAWT is carried out and the influence of aerodynamic damping on the fatigue load is investigated.

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Metals Challenged By Neutron And Synchrotron Radiation, Klaus-Dieter Liss Jan 2017

Metals Challenged By Neutron And Synchrotron Radiation, Klaus-Dieter Liss

Faculty of Engineering and Information Sciences - Papers: Part B

In the past one and a half decades, neutron and synchrotron radiation techniques have come to the forefront as an excellent set of tools for the wider investigation of material structures and properties, becoming available to a large user community. This holds especially true for metals, which are a fascinating class of materials with both structural and functional applications. With respect to these application classes, metals are used to engineer bridges and automotive engines as well as to exploit magnetic and electric properties in computer storage, optics, and electronics. Both neutron sources and synchrotrons are large user facilities of quantum-beam …

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Performance Of Buried Hdpe Pipes - Part I: Peaking Deflection During Initial Backfilling Process, Min Zhou, Yan Jun Du, Fei Wang, Martin D. Liu Jan 2017

Performance Of Buried Hdpe Pipes - Part I: Peaking Deflection During Initial Backfilling Process, Min Zhou, Yan Jun Du, Fei Wang, Martin D. Liu

Faculty of Engineering and Information Sciences - Papers: Part B

Peaking deflection caused by compacting the sidefill, referred to as the maximum change of the pipe diameter divided by the undeformed diameter, is an important parameter in the design and safety check of buried pipelines. However, quantitative equations on the deflection useful for engineering practice are very limited. In this paper, a two-dimensional finite element analysis is used to investigate the peaking deflection of high-density polyethylene (HDPE) pipes. In the analyses, the pipe¿soil interaction is rationally modeled. A field trial is conducted and the finite-element modeling is evaluated by using the data measured in the field test. Parametric studies are …

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Current Research Into Ballasted Rail Tracks: Model Tests And Their Practical Implications, Buddhima Indraratna, Qideng Sun, Ngoc Trung Ngo, Cholachat Rujikiatkamjorn Jan 2017

Current Research Into Ballasted Rail Tracks: Model Tests And Their Practical Implications, Buddhima Indraratna, Qideng Sun, Ngoc Trung Ngo, Cholachat Rujikiatkamjorn

Faculty of Engineering and Information Sciences - Papers: Part B

Ballasted rail tracks are the most important mode of transportation in terms of traffic tonnage serving the needs of bulk freight and passenger movement, but under train loads, the particles degrade due to breakage and the progressive accumulation of external fines or mud-pumping under the subgrade, all of which reduce its shear strength and increase track instability. These actions adversely affect the safety, passenger comfort and efficiency of tracks, as well as enforcing speed restrictions and more frequent track maintenance. In spite of advances in rail track geotechnology, the optimum choice of ballast for track design is still considered critical …

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Comprehensive Gait Analysis Of Healthy Older People: Unveiling Reasons For Lack Of Long-Distance Walking, Mustafa M. Elhadi, Christina Ma, Duo Wong, Anson Wan, Winson Lee Jan 2017

Comprehensive Gait Analysis Of Healthy Older People: Unveiling Reasons For Lack Of Long-Distance Walking, Mustafa M. Elhadi, Christina Ma, Duo Wong, Anson Wan, Winson Lee

Faculty of Engineering and Information Sciences - Papers: Part B

Many older adults do not adhere to the recommended physical activity levels. This study examines the gait changes upon long-distance walking among healthy older adults. Gait tests of 24 adults aged 65 or more were conducted at the baseline, at the end of 30 and 60 minutes of treadmill walk. Spatial temporal, kinematic and kinetic gait data were computed. Perceived level of exertion was evaluated for each subject. Ten subjects (Group B) perceived higher exertion level than the remaining fourteen subjects (Group A). After walking, group B had significant reductions in dominant-side ankle joint range of motion and power, suggesting …

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Wear And Friction Behaviour Of High-Speed Steel And Indefinite Chill Material For Rolling Ferritic Stainless Steels, Liang Hao, Hui Wu, Dongbin Wei, Xiawei Cheng, Jingwei Zhao, Suzhen Luo, Laizhu Jiang, Zhengyi Jiang Jan 2017

Wear And Friction Behaviour Of High-Speed Steel And Indefinite Chill Material For Rolling Ferritic Stainless Steels, Liang Hao, Hui Wu, Dongbin Wei, Xiawei Cheng, Jingwei Zhao, Suzhen Luo, Laizhu Jiang, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, wear and friction behaviour of high-speed steel (HSS) and indefinite chill (IC) material for rolling a ferritic stainless steel were investigated on a tribometer. A disk specimen of the ferritic stainless steel-B445J1M was pre-oxidised at 1100 °C for 30 min, and then rotated against a pin at 500 °C for 30 min. The pin was made of HSS or IC material. It was found that the friction coefficient of the IC was lower than that of the HSS, but the mass loss of the HSS pin was less than that of the IC pin. The oxide scale …

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Effect Of Loading On The Friction And Interface Microstructure Of Lubricated Steel Tribopairs, Shaogang Cui, Hongtao Zhu, Shanhong Wan, Anh Kiet Tieu, Bach H. Tran, Liping Wang, Qiang Zhu Jan 2017

Effect Of Loading On The Friction And Interface Microstructure Of Lubricated Steel Tribopairs, Shaogang Cui, Hongtao Zhu, Shanhong Wan, Anh Kiet Tieu, Bach H. Tran, Liping Wang, Qiang Zhu

Faculty of Engineering and Information Sciences - Papers: Part B

In this study, the tribological behavior and interfacial evolution of GCr15/Mild steel tribopairs lubricated by inorganic sodium metaphosphate was investigated under different applied loads at 800 °C. The results show that sodium metaphosphate lubricates the contact effectively at the load ranging from 5 to 30 N, with higher loads causing increased friction and wear. A layer of glassy phosphate film formed between the contacts is responsible for the improved tribological performance. FIB/TEM and XRD analysis reveals that the phosphate film was mainly composed of amorphous Na-Fe orthophosphate matrix filled up with fine oxide wear debris.

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Precipitates And Particles Coarsening Of 9cr-1.7w-0.4mo-Co Ferritic Heat-Resistant Steel After Isothermal Aging, Qiuzhi Gao, Yanan Zhang, Hailian Zhang, Hui Jun Li, Fu Qu, Jian Han, Cheng Lu, Bintao Wu, Yao Lu, Yan Ma Jan 2017

Precipitates And Particles Coarsening Of 9cr-1.7w-0.4mo-Co Ferritic Heat-Resistant Steel After Isothermal Aging, Qiuzhi Gao, Yanan Zhang, Hailian Zhang, Hui Jun Li, Fu Qu, Jian Han, Cheng Lu, Bintao Wu, Yao Lu, Yan Ma

Faculty of Engineering and Information Sciences - Papers: Part B

The precipitates obtained by EPE technology from the 9Cr-1.7W-0.4Mo-Co ferritic heat-resistant steel subject to isothermal aging were investigated using SEM, TEM and XRD. The particle size distribution and the coarsening kinetics of M23C6 with duration of isothermal aging were also analyzed with or without consideration of Laves phase. The results show that the isolated dislocations were detected in delta ferrite interior, and the precipitates on delta ferrite and martensite boundaries are obviously larger than other locations. Fe2W-Laves phase can only be found as duration of aging time to 2000 h, and is preferential to form …

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Closure To "Micromechanics-Based Investigation Of Fouled Ballast Using Large-Scale Triaxial Tests And Discrete Element Modeling", Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn Jan 2017

Closure To "Micromechanics-Based Investigation Of Fouled Ballast Using Large-Scale Triaxial Tests And Discrete Element Modeling", Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn

Faculty of Engineering and Information Sciences - Papers: Part B

The writers would like to express their appreciation for the feedback provided by the discusser, and for raising some important aspects of clay-fouled ballast used in the laboratory and as simulated using the discrete element method (DEM). Although the writers are in general agreement with the discusser's comments, some points warrant further clarification, as highlighted herein.

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A Pilot Scale Study On Synergistic Effects Of Co-Digestion Of Pig Manure And Grass Silage, Sihuang Xie, Peadar G. Lawlor, Peter Frost, Conor Dennehy, Zhenhu Hu, Xinmin Zhan Jan 2017

A Pilot Scale Study On Synergistic Effects Of Co-Digestion Of Pig Manure And Grass Silage, Sihuang Xie, Peadar G. Lawlor, Peter Frost, Conor Dennehy, Zhenhu Hu, Xinmin Zhan

Faculty of Engineering and Information Sciences - Papers: Part B

This study aimed to assess the system stability and synergistic effects of co-digesting pig manure (PM) and grass silage (GS) in a pilot-scale study. Anaerobic digestion of PM alone and co-digestion of PM with GS was carried out in a 480-L continuously stirred tank reactor. The experiment consisted of two phases. In Phase I, PM was digested at an organic loading rate (OLR) of 0.87 kg volatile solid (VS) m−3·d−1, and in Phase II, PM and GS were co-digested at 1:1 on a VS basis at an OLR of 1.74 kg VS·m−3·d−1. …

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Exponential-Family Random Graph Models For Rank-Order Relational Data, Pavel N. Krivitsky, Carter T. Butts Jan 2017

Exponential-Family Random Graph Models For Rank-Order Relational Data, Pavel N. Krivitsky, Carter T. Butts

Faculty of Engineering and Information Sciences - Papers: Part B

Rank-order relational data, in which each actor ranks other actors according to some criterion, often arise from sociometric measurements of judgment or preference. The authors propose a general framework for representing such data, define a class of exponential-family models for rank-order relational structure, and derive sufficient statistics for interdependent ordinal judgments that do not require the assumption of comparability across raters. These statistics allow estimation of effects for a variety of plausible mechanisms governing rank structure, both in a cross-sectional context and evolving over time. The authors apply this framework to model the evolution of liking judgments in an acquaintance …

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A New Closed-Form Formula For Pricing European Options Under A Skew Brownian Motion, Song-Ping Zhu, Xin-Jiang He Jan 2017

A New Closed-Form Formula For Pricing European Options Under A Skew Brownian Motion, Song-Ping Zhu, Xin-Jiang He

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, we present a new pricing formula based on a modified Black-Scholes (B-S) model with the standard Brownian motion being replaced by a particular process constructed with a special type of skew Brownian motions. Although Corns and Satchell [2007. "Skew Brownian Motion and Pricing European Options." The European Journal of Finance 13 (6): 523-544] have worked on this model, the results they obtained are incorrect. In this paper, not only do we identify precisely where the errors in Although Corns and Satchell [2007. "Skew Brownian Motion and Pricing European Options". The European Journal of Finance 13 (6): 523-544] …

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Once Only Principle: Benefits, Barriers & Next Steps, Maria Wimmer, Efthimios Tambouris, Robert Krimmer, J Gil-Garcia, Akemi T. Chatfield Jan 2017

Once Only Principle: Benefits, Barriers & Next Steps, Maria Wimmer, Efthimios Tambouris, Robert Krimmer, J Gil-Garcia, Akemi T. Chatfield

Faculty of Engineering and Information Sciences - Papers: Part B

The Once-Once Principle (OOP) suggests that citizens and businesses should have the right to supply information only once to a public administration. It would then be the responsibility of public administration offices to take all necessary actions in order to internally share this data by respecting the relevant data protection rules. The overall aim is to reduce administrative burden. The implementation of the OOP is high on the political agenda of many countries including the Member States of the European Union. The aim of this panel is to enable an open discussion between the panelists and the audience in order …

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Fabrication Of Agbr/Boron-Doped Reduced Graphene Oxide Aerogels For Photocatalytic Removal Of Cr(Vi) In Water, Yiqiao Huang, Chengling Zhu, Hui Pan, Da Xu, Tao Lu, Lin Mao, Xin Meng, Zhixin Chen, Di Zhang, Shenmin Zhu Jan 2017

Fabrication Of Agbr/Boron-Doped Reduced Graphene Oxide Aerogels For Photocatalytic Removal Of Cr(Vi) In Water, Yiqiao Huang, Chengling Zhu, Hui Pan, Da Xu, Tao Lu, Lin Mao, Xin Meng, Zhixin Chen, Di Zhang, Shenmin Zhu

Faculty of Engineering and Information Sciences - Papers: Part B

AgBr nanoparticles on boron-doped reduced graphene oxide aerogels (AgBr/B-RGO) are synthesized by a facile hydrothermal method, which shows a superior performance in the photoreduction of toxic hexavalent chromium (CrVI) in aqueous media under visible light irradiation. The composition and structure of the samples have been characterized by using XPS, Raman, XRD, TEM and SEM measurements. As compared with that of AgBr on none-doped reduced graphene oxide aerogels (AgBr/RGO), the improved photocatalytic properties, can be attributed to the introduction of boron atoms in reduced graphene oxide (RGO), bringing in the improvement of electron transfer efficiency, and the depression of …

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Dynamic Response Of Shear Thickening Fluid Reinforced With Sic Nanowires Under High Strain Rates, Zhuhua Tan, Jianhao Ge, Hang Zhang, Pengcheng Zhai, Weihua Li Jan 2017

Dynamic Response Of Shear Thickening Fluid Reinforced With Sic Nanowires Under High Strain Rates, Zhuhua Tan, Jianhao Ge, Hang Zhang, Pengcheng Zhai, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part B

In this letter, SiC nanowires were adopted to reinforce the nanoparticle-based shear thickening fluid (STF) to improve its rheological properties. The reinforced STF showed a significant increase in viscosity. A Split-Hopkinson pressure bar was implemented to evaluate the dynamic response of STF at strain rates in the range of 3 × 103–1.2 × 104/s. For the pure STF, the flow stress reaches a saturation value with increasing strain rates and shows almost no strain rate sensitivity, whereas the flow stress of the reinforced STF increases with strain rates, and the strain rate sensitivity to flow stress …

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A Wearable Vibrotactile Biofeedback System Improves Balance Control Of Healthy Young Adults Following Perturbations From Quiet Stance, Christina Ma, Winson Lee Jan 2017

A Wearable Vibrotactile Biofeedback System Improves Balance Control Of Healthy Young Adults Following Perturbations From Quiet Stance, Christina Ma, Winson Lee

Faculty of Engineering and Information Sciences - Papers: Part B

Maintaining postural equilibrium requires fast reactions and constant adjustments of the center of mass (CoM) position to prevent falls, especially when there is a sudden perturbation of the support surface. During this study, a newly developed wearable feedback system provided immediate vibrotactile clues to users based on plantar force measurement, in an attempt to reduce reaction time and CoM displacement in response to a perturbation of the floor. Ten healthy young adults participated in this study. They stood on a support surface, which suddenly moved in one of four horizontal directions (forward, backward, left and right), with the biofeedback system …

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Simulation Of Particle Deformation Within A Compressed Packed Bed, Leela M. Kempton, David J. Pinson, Sheng Chew, Paul Zulli, Aibing Yu Jan 2017

Simulation Of Particle Deformation Within A Compressed Packed Bed, Leela M. Kempton, David J. Pinson, Sheng Chew, Paul Zulli, Aibing Yu

Faculty of Engineering and Information Sciences - Papers: Part B

Deformation arising from softening-melting conditions in the blast furnace has provided a significant challenge to numerical modelling. In this paper, a sub-particle discrete element approach is used to simulate a bed of particles deforming under load at a constant temperature. Effects of temperature on material properties are established through the use of simulations of material under compression, with the results compared to experimental data. This was used as a starting point for the packed bed simulations at different temperatures, with the ratios between parameters maintained. Porosity within the final bed was used as a measure of the deformation, and compared …

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Thermal Characterization Of Lauric Acid And Stearic Acid Binary Eutectic Mixture In Latent Heat Thermal Storage Systems With Tube And Fins, Lei Ding, Lixiong Wang, Georgios Kokogiannakis, Yajun Lu, Weibing Zhou Jan 2017

Thermal Characterization Of Lauric Acid And Stearic Acid Binary Eutectic Mixture In Latent Heat Thermal Storage Systems With Tube And Fins, Lei Ding, Lixiong Wang, Georgios Kokogiannakis, Yajun Lu, Weibing Zhou

Faculty of Engineering and Information Sciences - Papers: Part B

In order to obtain the suitable phase change material (PCM) with low phase change temperature and improve its heat transfer rate, experimental investigation was conducted. Firstly, different mass ratios of lauric acid (LA) and stearic acid(SA) eutectic mixtures were prepared and characterized by differential scanning calorimetry (DSC). Then, the performance of eutectic mixture during charging process under different fin widths in vertical condition, and performance during charging and discharging processes under different inlet temperature heat transfer fluid (HTF) in horizontal condition were investigated, respectively. The results revealed that the LA-SA eutectic mixture had the suitable phase change temperature and desired …

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Two-Scale Spatial Models For Binary Data, Cecile Hardouin, Noel A. Cressie Jan 2017

Two-Scale Spatial Models For Binary Data, Cecile Hardouin, Noel A. Cressie

Faculty of Engineering and Information Sciences - Papers: Part B

A spatial lattice model for binary data is constructed from two spatial scales linked through conditional probabilities. A coarse grid of lattice locations is specified, and all remaining locations (which we call the background) capture fine-scale spatial dependence. Binary data on the coarse grid are modelled with an autologistic distribution, conditional on the binary process on the background. The background behaviour is captured through a hidden Gaussian process after a logit transformation on its Bernoulli success probabilities. The likelihood is then the product of the (conditional) autologistic probability distribution and the hidden Gaussian-Bernoulli process. The parameters of the new model …

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A Unified Censored Normal Regression Model For Qpcr Differential Gene Expression Analysis, Peter Pipelers, Lieven Clement, Matthijs Vynck, Jan Hellemans, J Vandesompele, Olivier Thas Jan 2017

A Unified Censored Normal Regression Model For Qpcr Differential Gene Expression Analysis, Peter Pipelers, Lieven Clement, Matthijs Vynck, Jan Hellemans, J Vandesompele, Olivier Thas

Faculty of Engineering and Information Sciences - Papers: Part B

Reverse transcription quantitative polymerase chain reaction (RT-qPCR) is considered as the gold standard for accurate, sensitive, and fast measurement of gene expression. Prior to downstream statistical analysis, RT-qPCR fluorescence amplification curves are summarized into one single value, the quantification cycle (Cq). When RT-qPCR does not reach the limit of detection, the Cq is labeled as "undetermined". Current state of the art qPCR data analysis pipelines acknowledge the importance of normalization for removing non-biological sample to sample variation in the Cq values. However, their strategies for handling undetermined Cq values are very ad hoc. We show that popular methods for handling …

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On The Convergence Of He And Zhu's New Series Solution For Pricing Options With The Heston Model, Song-Ping Zhu, Xin-Jiang He Jan 2017

On The Convergence Of He And Zhu's New Series Solution For Pricing Options With The Heston Model, Song-Ping Zhu, Xin-Jiang He

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, a modified formula for European options and a set of complete convergence proofs for the solution that cover the entire time horizon of a European option contact are presented under the Heston model with minimal entropy martingale measure. Although He & Zhu [5] worked on this model, they only provided a converged solution with a condition imposed on the time to expiry. The new solution presented here is only slightly modified in its form. But, it is accompanied with the proof of convergence of the solution for the entire span of the time horizon of an option.

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A Framework Of Mlaas For Facilitating Adaptive Micro Learning Through Open Education Resources In Mobile Environment, Geng Sun, Tingru Cui, Wanwu Guo, Shiping Chen, Jun Shen Jan 2017

A Framework Of Mlaas For Facilitating Adaptive Micro Learning Through Open Education Resources In Mobile Environment, Geng Sun, Tingru Cui, Wanwu Guo, Shiping Chen, Jun Shen

Faculty of Engineering and Information Sciences - Papers: Part B

No abstract provided.

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