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Articles 4561 - 4590 of 8590

Full-Text Articles in Science and Technology Studies

Collusion-Resistance In Optimistic Fair Exchange, Yang Wang, Willy Susilo, Man Ho Au, Guilin Wang Jan 2014

Collusion-Resistance In Optimistic Fair Exchange, Yang Wang, Willy Susilo, Man Ho Au, Guilin Wang

Faculty of Engineering and Information Sciences - Papers: Part A

Optimistic fair exchange (OFE) is a type of cryptographic protocols aimed at solving the fair exchange problem over open networks with the help of a third party to settle disputes between exchanging parties. It is well known that a third party is necessary in the realization of a fair exchange protocol. However, a fully trusted third party may not be available over open networks. In this paper, the security of most of the proposed OFE protocols depends on the assumption that the third party is semitrusted in the sense that it may misbehave on its own but does not conspire …

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Cp-Abe With Constant-Size Keys For Lightweight Devices, Fuchun Guo, Willy Susilo, Duncan Wong, Vijay Varadharajan Jan 2014

Cp-Abe With Constant-Size Keys For Lightweight Devices, Fuchun Guo, Willy Susilo, Duncan Wong, Vijay Varadharajan

Faculty of Engineering and Information Sciences - Papers: Part A

Lightweight devices, such as radio frequency identi- fication tags, have a limited storage capacity, which has become a bottleneck for many applications, especially for security applica- tions. Ciphertext-policy attribute-based encryption (CP-ABE) is a promising cryptographic tool, where the encryptor can decide the access structure that will be used to protect the sensitive data. However, current CP-ABE schemes suffer from the issue of having long decryption keys, in which the size is linear to and dependent on the number of attributes. This drawback prevents the use of lightweight devices in practice as a storage of the decryption keys of the CP-ABE …

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Ppdcp-Abe: Privacy-Preserving Decentralized Ciphertext-Policy Attribute-Based Encryption, Jinguang Han, Willy Susilo, Yi Mu, Jianying Zhou, Man Ho Au Jan 2014

Ppdcp-Abe: Privacy-Preserving Decentralized Ciphertext-Policy Attribute-Based Encryption, Jinguang Han, Willy Susilo, Yi Mu, Jianying Zhou, Man Ho Au

Faculty of Engineering and Information Sciences - Papers: Part A

Cipher-policy attribute-based encryption (CP-ABE) is a more efficient and flexible encryption system as the encryptor can control the access structure when encrypting a message. In this paper, we propose a privacy-preserving decentralized CP-ABE (PPDCP-ABE) scheme where the central authority is not required, namely each authority can work independently without the cooperation to initialize the system. Meanwhile, a user can obtain secret keys from multiple authorities without releasing his global identifier (GID) and attributes to them. This is contrasted to the previous privacy-preserving multi-authority ABE (PPMA-ABE) schemes where a user can obtain secret keys from multiple authorities with them knowing his …

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Real-Time Control Of Inertial Focusing In Microfluidics Using Dielectrophoresis (Dep), Jun Zhang, Sheng Yan, Gursel Alici, Nam-Trung Nguyen, Dino Di Carlo, Weihua Li Jan 2014

Real-Time Control Of Inertial Focusing In Microfluidics Using Dielectrophoresis (Dep), Jun Zhang, Sheng Yan, Gursel Alici, Nam-Trung Nguyen, Dino Di Carlo, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper, we propose a novel hybrid microfluidic device, for the first time, which integrates and fully couples both dielectrophoresis (DEP) and inertial focusing. A DEP force is coupled with inertial lift force to adjust particle's equilibrium position in the vertical direction in real time. The focusing pattern and position of the particles along the horizontal plane can be concurrently adjusted by adjusting their vertical position with DEP forces. The magnitude of secondary flow drag dramatically increases when particles are levitated towards the centre of the channel in the vertical direction. The paper analytically and experimentally investigates the mechanism …

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Optimistic Fair Exchange In The Enhanced Chosen-Key Model, Yang Wang, Man Ho Au, Willy Susilo Jan 2014

Optimistic Fair Exchange In The Enhanced Chosen-Key Model, Yang Wang, Man Ho Au, Willy Susilo

Faculty of Engineering and Information Sciences - Papers: Part A

Optimistic fair exchange (OFE) is a kind of protocol to guarantee fairness for the parties involved in an exchange with the help of an arbitrator. A fundamental work of optimistic fair exchange is to define security models capturing realistic attacks and design schemes secure in practical models. The security models are very essential to ensure that they capture practical situation, which will ensure that the protocols can be adopted in practice. The contributions of this paper are three fold. First, we observe that the existing OFE models do not capture realistic situation, where the adversary can actually observe the full …

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A Novel Type Of One-Dimensional Organic Selenium-Containing Fiber With Superior Performance For Lithium-Selenium And Sodium-Selenium Batteries, Hongqiang Wang, Sha Li, Zhixin Chen, Hua-Kun Liu, Zaiping Guo Jan 2014

A Novel Type Of One-Dimensional Organic Selenium-Containing Fiber With Superior Performance For Lithium-Selenium And Sodium-Selenium Batteries, Hongqiang Wang, Sha Li, Zhixin Chen, Hua-Kun Liu, Zaiping Guo

Faculty of Engineering and Information Sciences - Papers: Part A

A novel type of organic selenide fiber composed of carbonized polyacrylonitrile/selenium (CPAN/Se) has been synthesized by heating polyacrylonitrile-selenium (PAN-Se) fibers via the electrospinning technique at 600°C. The Se molecules are confined by N-containing carbon ring structures in the form of energy-storing selenium side chains in the carbonized PAN matrix. This unique stable chemical structure with a conductive carbon skeleton connected to the selenium side chains and excellent mechanical stability can allow CPAN/Se composite cathodes to be charged and discharged in a low-cost carbonate-based electrolyte with excellent long cycle stability and quite good rate performance. The superior electrochemical performance of CPAN/Se …

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Large-Area Binary Blazed Grating Coupler Between Nanophotonic Waveguide And Led, Hongqiang Li, Wenqian Zhou, Meiling Zhang, Yu Liu, Cheng Zhang, Enbang Li, Changyun Miao, Chunxiao Tang Jan 2014

Large-Area Binary Blazed Grating Coupler Between Nanophotonic Waveguide And Led, Hongqiang Li, Wenqian Zhou, Meiling Zhang, Yu Liu, Cheng Zhang, Enbang Li, Changyun Miao, Chunxiao Tang

Faculty of Engineering and Information Sciences - Papers: Part A

A large-area binary blazed grating coupler for the arrayed waveguide grating (AWG) demodulation integrated microsystem on silicon-on-insulator (SOI) was designed for the first time. Through the coupler, light can be coupled into the SOI waveguide from the InP-based C-band LED for the AWG demodulation integrated microsystem to function. Both the length and width of the grating coupler are 360 mu m, as large as the InP-based C-band LED light emitting area in the system. The coupler was designed and optimized based on the finite difference time domain method. When the incident angle of the light source is 0 degrees, the …

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Efeito Da Granulometria Na Deformação E Quebra De Lastro Ferroviário, Gino O. Calderon Vizcarra, Sanjay Nimbalkar, Buddhima Indraratna, Michele Dal Toe Casagrande Jan 2014

Efeito Da Granulometria Na Deformação E Quebra De Lastro Ferroviário, Gino O. Calderon Vizcarra, Sanjay Nimbalkar, Buddhima Indraratna, Michele Dal Toe Casagrande

Faculty of Engineering and Information Sciences - Papers: Part A

O efeito da granulometria no comportamento mecânico do lastro tem sido estudado por vários pesquisadores no passado. A revisão de estes estudos indicaram que uma gradação mais uniforme que as atualmente usadas pela indústria ferroviária, diminuiria a deformação permanente e degradação do lastro ferroviário. Neste estudo, o equipamento prismoidal triaxial cíclico projetado e construído na Universidade de Wollongong foi utilizado. Duas granulometrias de lastro foram testadas sob tensão vertical cíclica máxima de 450 kPa. Os resultados mostraram que a granulometria teve grande influencia a deformação permanente e quebra de lastro ferroviário.

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Erosion Mitigation Of Lignosulfonate Treated Unstable Soils, Buddhima Indraratna, Rasika Manori Athukorala, J S Vinod Jan 2014

Erosion Mitigation Of Lignosulfonate Treated Unstable Soils, Buddhima Indraratna, Rasika Manori Athukorala, J S Vinod

Faculty of Engineering and Information Sciences - Papers: Part A

Highly unstable soils are common in many parts of the world. In recent years, traditional chemical admixtures such as cement, lime and fly ash were used for stabilising these soils. However, not all chemical stabilisers are readily acceptable due to stringent occupational health and safety issues and invariable change of soil pH that often limits the scope of vegetation plus imposing a threat to ground water pollution. However, recent research shows that lignosulfonate, an environmentally sustainable admixture, can stabilise unstable and erodible soils without causing adverse effects on the environment. This paper presents the results of a laboratory investigation and …

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Evaluation Of The Coal Wash And Steel Furnace Slag Blends As Effective Reclamation Fill For Port Expansion, Ana Heitor, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Gabriele Chiaro, S.M.Ali Tasalloti Jan 2014

Evaluation Of The Coal Wash And Steel Furnace Slag Blends As Effective Reclamation Fill For Port Expansion, Ana Heitor, Buddhima Indraratna, Cholachat Rujikiatkamjorn, Gabriele Chiaro, S.M.Ali Tasalloti

Faculty of Engineering and Information Sciences - Papers: Part A

Coal wash (CW) and steel furnace slag (SFS) are granular waste by-products that result from the operation of the coal mining and the steel industries, respectively. Their effective reuse and recycling as fill materials for earthwork construction, embankments and/or structural fill materials in port expansion projects, is economically attractive and environmentally sustainable because it lessens the need for disposal and sourcing of materials from local quarries. As the need for blending these materials arises from their individual adverse geotechnical characteristics, i.e. swelling and breakage behaviour in SFS and CW, it is important to evaluate the suitability of different mixtures ratios …

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Improvement Of Soil Stability Along Rail Corridors Through Native Vegetation, Buddhima Indraratna, Muditha Pallewattha, Behzad Fatahi, Punyama Udeshini Pathirage Jan 2014

Improvement Of Soil Stability Along Rail Corridors Through Native Vegetation, Buddhima Indraratna, Muditha Pallewattha, Behzad Fatahi, Punyama Udeshini Pathirage

Faculty of Engineering and Information Sciences - Papers: Part A

Field studies conducted along the railway lines in Australia have revealed the ability to implement the green corridor concept as a soil stabilization method. Native trees grown along rail corridors are capable of increasing the matric suction of the subgrade soil underneath the track substructure via root water uptake, in conjunction with the tree canopy evapo-transpiration. Moreover, these trees are capable of providing significant mechanical reinforcement through the anchoring effect provided by the root network plus the additional cohesive increment due to hair roots generating osmotic suction. Much of the previous research carried out to quantify the mechanical strength generated …

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Exploiting Superior Tensile Properties Of A Novel Network-Structure Ala206 Matrix Composite By Hybridizing Micron-Sized Al3ti With Al2o3 Nano Particulates, S Tahamtan, A Halvaee, M Emamy, Z Y. Jiang, A Fadavi Boostani Jan 2014

Exploiting Superior Tensile Properties Of A Novel Network-Structure Ala206 Matrix Composite By Hybridizing Micron-Sized Al3ti With Al2o3 Nano Particulates, S Tahamtan, A Halvaee, M Emamy, Z Y. Jiang, A Fadavi Boostani

Faculty of Engineering and Information Sciences - Papers: Part A

In this study, semi-solid stir casting and ball milling processes are combined into an integrated composite fabrication process. Two different architectures were utilized to incorporate reinforcing particle into semi-solid alloy i.e., (i) ball milling of K2TiF6 and aluminum powder for 5h and subsequently with nano-alumina particles (Al2O3np) for 1h and (ii) ball milling of K2TiF6, Al2O3np and aluminum powder for 2h. Accordingly, the milled powders were incorporated into molten AlA206 alloy using a non-contact ultrasonic vibration method. The effect of milling procedure on microstructural evolution and tensile properties were then explored. Two different microstructures were characterized including well-distributed Al2O3np and …

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Particle Sizing Using Dielectrophoresis-Active Hydrophoresis, Sheng Yan, Jun Zhang, Yuan Yuan, Gursel Alici, Haiping Du, Y Zhu, Weihua Li Jan 2014

Particle Sizing Using Dielectrophoresis-Active Hydrophoresis, Sheng Yan, Jun Zhang, Yuan Yuan, Gursel Alici, Haiping Du, Y Zhu, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part A

A particle sizing technique using dielectrophoresis-active hydrophoresis is presented in this study. This method can measure particle diameters without complex optical tools and electric impedance, and can be adjusted by modulating the external voltage.

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A State-Of-The-Art Review On Magnetorheological Elastomer Devices, Yancheng Li, Jianchun Li, Weihua Li, Haiping Du Jan 2014

A State-Of-The-Art Review On Magnetorheological Elastomer Devices, Yancheng Li, Jianchun Li, Weihua Li, Haiping Du

Faculty of Engineering and Information Sciences - Papers: Part A

During the last few decades, magnetorheological (MR) elastomers have attracted a significant amount of attention for their enormous potential in engineering applications. Because they are a solid counterpart to MR fluids, MR elastomers exhibit a unique field-dependent material property when exposed to a magnetic field, and they overcome major issues faced in magnetorheological fluids, e.g. the deposition of iron particles, sealing problems and environmental contamination. Such advantages offer great potential for designing intelligent devices to be used in various engineering fields, especially in fields that involve vibration reduction and isolation. This paper presents a state of the art review on …

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Analysing The Quality Of Experience Of Multisensory Media From Measurements Of Physiological Responses, Jacob Donley, Christian H. Ritz, Muawiyath Shujau Jan 2014

Analysing The Quality Of Experience Of Multisensory Media From Measurements Of Physiological Responses, Jacob Donley, Christian H. Ritz, Muawiyath Shujau

Faculty of Engineering and Information Sciences - Papers: Part A

This paper investigates the Quality of Experience (QoE) of multisensory media by analysing biosignals collected by electroencephalography (EEG) and eye gaze sensors and comparing with subjective ratings. Also investigated is the impact on QoE of various levels of synchronicity between the sensory effect and target video scene. Results confirm findings from previous research that show sensory effects added to videos increases the QoE rating. While there was no statistical difference observed for the QoE ratings for different levels of sensory effect synchronicity, an analysis of raw EEG data showed 25% more activity in the temporal lobe during asynchronous effects and …

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Let Me Be Learned: Decision Support Aiding Public Participation, Raymond Laine, Christopher David Cook Jan 2014

Let Me Be Learned: Decision Support Aiding Public Participation, Raymond Laine, Christopher David Cook

Faculty of Engineering and Information Sciences - Papers: Part A

With best practice flood risk management processes rightly emphasising the need for a collaborative, transparent and inclusive approach to improve community resilience, this paper explores a new Engagement Decision Support System (EDSS) as a mechanism to assist in this process. This paper presents the need, theory and development of a flood risk management EDSS and presents trial results, where the tool has been successfully utilised for three catchments in New South Wales, Australia. The results from these trials indicate that a well-structured, engagement focused decision support system can provide a mechanism for and empower the public to learn about, prioritise …

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Removing The Impulsive Noise Contained In A Self-Mixing Interferometry System Using Outlier Detection, Yan Gao, Yanguang Yu, Jiangtao Xi, Qinghua Guo, Jun Tong, Sheng Tong Jan 2014

Removing The Impulsive Noise Contained In A Self-Mixing Interferometry System Using Outlier Detection, Yan Gao, Yanguang Yu, Jiangtao Xi, Qinghua Guo, Jun Tong, Sheng Tong

Faculty of Engineering and Information Sciences - Papers: Part A

Impulsive noise is a major problem that seriously degrades the performance of self-mixing interferometry (SMI). A new method to rectify this issue is proposed. First, an outlier detection approach is employed to detect the data samples corrupted by the impulsive noise, and then the SMI signal waveform is rectified by means of least square (LS) curve fitting. The results show that the proposed method can effectively remove the impulsive noise without introducing distortion to the original waveform and thus lead to improvement in the performance of an SMI system.

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Investigation Into The Effect Of Vortex-Induced Vibrations On The Power-Output Of A Pitching Cylinder Wave Energy Converter, Ashley W. Heath, Brad Stappenbelt Jan 2014

Investigation Into The Effect Of Vortex-Induced Vibrations On The Power-Output Of A Pitching Cylinder Wave Energy Converter, Ashley W. Heath, Brad Stappenbelt

Faculty of Engineering and Information Sciences - Papers: Part A

The aim of the present investigation was to examine the question of whether the introduction of cross-flow vortex-induced vibration (VIV) of point absorber wave energy extraction devices is detrimental or beneficial to power take-off (PTO) efficiency. The dynamic drag amplification experienced by a circular cylinder undergoing cross-flow vortex-induced vibration is well documented for both the steady flow and oscillatory flow cases. The dynamic drag amplification experienced by a cylinder undergoing VIV in a wave environment indicates that there are potential benefits in allowing a drag dominated wave energy device to simultaneously experience cross-flow VIV. Experiments were conducted with a pivoted …

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Electrochemistry And Structure Of The Cobalt-Free Li1+Xmo2 (M = Li, Ni, Mn, Fe) Composite Cathode, Wei Kong Pang, Sujith Kalluri, Vanessa Peterson, S X. Dou, Zaiping Guo Jan 2014

Electrochemistry And Structure Of The Cobalt-Free Li1+Xmo2 (M = Li, Ni, Mn, Fe) Composite Cathode, Wei Kong Pang, Sujith Kalluri, Vanessa Peterson, S X. Dou, Zaiping Guo

Faculty of Engineering and Information Sciences - Papers: Part A

The development of cathode materials with high capacity and cycle stability is essential to emerging electric-vehicle technologies, however, of serious environmental concern is that materials with these properties developed so far contain the toxic and expensive Co. We report here the Li-rich, Co-free Li1+xMO2 (M = Li, Ni, Mn, Fe) composite cathode material, prepared via a template-free, one-step wet-chemical method followed by conventional annealing in an oxygen atmosphere. The cathode has an unprecedented level of cation mixing, where the electrochemically-active component contains four elements at the transition-metal (3a) site and 20% Ni at the active Li site (3b). We find …

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Influence Of Vertical Motion On Initiation Of Sediment Movement, Ishraq Alfadhli, Shu-Qing Yang, Muttucumaru Sivakumar Jan 2014

Influence Of Vertical Motion On Initiation Of Sediment Movement, Ishraq Alfadhli, Shu-Qing Yang, Muttucumaru Sivakumar

Faculty of Engineering and Information Sciences - Papers: Part A

This paper makes an attempt to answer why the observed critical Shields stress for incipient sediment motion deviates from the Shields curve. The measured dataset collected from literature show that the critical Shields stress widely deviates from the Shields diagram’s prediction. This paper has re-examined the possible mechanisms responsible for the validity of Shields’ diagram and found that, among many factors, the vertical velocity in the sediment layer plays a leading role for the invalidity of Shield’s prediction. A closer look of the positive/negative deviation reveals that they correspond to the up/downward vertical velocity, and the Shields diagram is valid …

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Modelling And Identifying The Parameters Of A Magneto-Rheological Damper With A Force-Lag Phenomenon, Gangrou Peng, Weihua Li, Haiping Du, Huaxia Deng, Gursel Alici Jan 2014

Modelling And Identifying The Parameters Of A Magneto-Rheological Damper With A Force-Lag Phenomenon, Gangrou Peng, Weihua Li, Haiping Du, Huaxia Deng, Gursel Alici

Faculty of Engineering and Information Sciences - Papers: Part A

In this study a model based on the Bouc-Wen-Baber-Noori (BWBN) method was proposed to describe the distorted hysteretic behaviour of a self-constructed magneto-rheological (MR) damper whose mechanical performance was measured with an Instron test machine. The experimental results indicated that the MR damper exhibited a force-lag phenomenon. The parameters of the modified BWBN model were identified with the MATLAB SIMULINK Design and Optimisation toolbox. A comparison between the experimental results and modelling predictions revealed that the proposed model could well present the force-lag phenomenon.

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Experimental And Theoretical Study On Minimum Achievable Foil Thickness During Asymmetric Rolling, Delin Tang, Xianghua Liu, Meng Song, Hailiang Yu Jan 2014

Experimental And Theoretical Study On Minimum Achievable Foil Thickness During Asymmetric Rolling, Delin Tang, Xianghua Liu, Meng Song, Hailiang Yu

Faculty of Engineering and Information Sciences - Papers: Part A

Parts produced by microforming are becoming ever smaller. Similarly, the foils required in micro-machines are becoming ever thinner. The asymmetric rolling technique is capable of producing foils that are thinner than those produced by the conventional rolling technique. The difference between asymmetric rolling and conventional rolling is the 'cross-shear' zone. However, the influence of the cross-shear zone on the minimum achievable foil thickness during asymmetric rolling is still uncertain. In this paper, we report experiments designed to understand this critical influencing factor on the minimum achievable thickness in asymmetric rolling. Results showed that the minimum achievable thickness of rolled foils …

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Design And Performance Evaluation Of A Novel Magnetorheological Valve With A Tunable Resistance Gap, Guoliang Hu, Ming Long, Lifan Yu, Weihua Li Jan 2014

Design And Performance Evaluation Of A Novel Magnetorheological Valve With A Tunable Resistance Gap, Guoliang Hu, Ming Long, Lifan Yu, Weihua Li

Faculty of Engineering and Information Sciences - Papers: Part A

This paper outlines the design and development of a novel magnetorheological (MR) valve with a tunable resistance gap that varies from 1 mm to 2 mm by rotating a valve spool. The finite element modelling and analysis of this proposed MR valve was carried out using ANSYS/Emag software, including achieving the optimal magnetic field distribution and magnetic flux density. A mathematical model of the pressure drop in the MR valve was built to study the pressure drop mechanism while considering the conical annular resistance gap. Moreover, this proposed MR valve with a tunable resistance gap was prototyped and evaluated experimentally, …

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Novel Algorithms For Complete Targets Coverage In Energy Harvesting Wireless Sensor Networks, Changlin Yang, Kwan-Wu Chin Jan 2014

Novel Algorithms For Complete Targets Coverage In Energy Harvesting Wireless Sensor Networks, Changlin Yang, Kwan-Wu Chin

Faculty of Engineering and Information Sciences - Papers: Part A

This paper addresses the problem of maximizing the network lifetime of rechargeable Wireless Sensor Networks (WSNs) whilst ensuring all targets are monitored continuously by at least one sensor node. The objective is to determine a group of sensor nodes, and their wake-up schedule such that within a time interval, one subset of nodes are active whilst others enter the sleep state to conserve energy as well as recharge their battery. We propose a Linear Programming (LP) based solution to determine the activation schedule of sensor nodes whilst affording them recharging opportunities and at the same time ensures complete target coverage. …

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Inconsistency Resolution In Merging Versions Of Architectural Models, Hoa Dam, Alexander Reder, Alexander Egyed Jan 2014

Inconsistency Resolution In Merging Versions Of Architectural Models, Hoa Dam, Alexander Reder, Alexander Egyed

Faculty of Engineering and Information Sciences - Papers: Part A

State-of-the-art optimistic model versioning systems, which are critical to enable efficient team-based development of architectural models, are able to detect and help resolve basic conflicts arising during the merging of model versions. However, it is often overlooked that model merging may also cause severe syntactical and semantic inconsistencies. In this paper, we propose an approach to guide the resolution of inconsistencies detected in a merged architectural model. Our approach automatically finds and presents to the software architects all solutions for resolving all inconsistencies arisen during the merging of model versions. For inconsistencies that preexist in the model, our approach is …

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The Stern-Brocot Continued Fraction, Bruce Philip Bates Jan 2014

The Stern-Brocot Continued Fraction, Bruce Philip Bates

Faculty of Engineering and Information Sciences - Papers: Part A

We discover a continued fraction whose successive approximants generate the Stern- Brocot sequence and levels of the Stern-Brocot tree. We also discover continued fractions whose approximants generate every term in diagonals and branches of the Stern-Brocot tree.

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Low-Energy Electron Scattering From Α-Tetrahydrofurfuryl Alcohol, Luca Chiari, Darryl Jones, Penny Thoi, Michael J. Brungei, Gustavo Garcia, Francisco Blanco Jan 2014

Low-Energy Electron Scattering From Α-Tetrahydrofurfuryl Alcohol, Luca Chiari, Darryl Jones, Penny Thoi, Michael J. Brungei, Gustavo Garcia, Francisco Blanco

Faculty of Engineering and Information Sciences - Papers: Part A

We report on differential cross section results for low-energy electron collisions with the biologically relevant species a-tetrahydrofurfuryl alcohol. Electron-impact excitation measurements of the electronic states of a-tetrahydrofurfuryl alcohol were carried out at incident energies between 15-50 eV and for scattering angles in the range 20-90 degrees. Elastic differential cross section have also been calculated within the Independent Atom Model and using the Screening Corrected Additivity Rule approach at selected energies between 1-1000 eV.

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Bayesian Space-Time Model To Analyse Frost Risk For Agriculture In Southeast Australia, Steven Crimp, Khandoker Shuvo Bakar, Phillip Kokic, Huidong Jin, Neville Nicholls, Mark Howden Jan 2014

Bayesian Space-Time Model To Analyse Frost Risk For Agriculture In Southeast Australia, Steven Crimp, Khandoker Shuvo Bakar, Phillip Kokic, Huidong Jin, Neville Nicholls, Mark Howden

Faculty of Engineering and Information Sciences - Papers: Part A

Despite a broad pattern of warming in minimum temperatures over the past 50years, regions of southeastern Australia have experienced increases in frost frequency in recent decades, and more broadly across southern Australia, an extension of the frost window due to an earlier onset and later cessation. Consistent across southern Australia is a later cessation of frosts, with some areas of southeastern Australia experiencing the last frost an average 4weeks later than in the 1960s (i.e. mean date of last frost for the period 1960-1970 was 19 September versus 22 October for the period 2000-2009). We seek to model the spatial …

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Co-Universal C∗-Algebras Associated To Aperiodic K-Graphs, Sooran Kang, Aidan Sims Jan 2014

Co-Universal C∗-Algebras Associated To Aperiodic K-Graphs, Sooran Kang, Aidan Sims

Faculty of Engineering and Information Sciences - Papers: Part A

We construct a representation of each finitely aligned aperiodic k-graph Λ on the Hilbert space Hapwith basis indexed by aperiodic boundary paths in Λ. We show that the canonical expectation on B(Hap) restricts to an expectation of the image of this representation onto the subalgebra spanned by the final projections of the generating partial isometries. We then show that every quotient of the Toeplitz algebra of the k-graph admits an expectation compatible with this one. Using this, we prove that the image of our representation, which is canonically isomorphic to the Cuntz–Krieger algebra, is co-universal for …

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Ultra Wideband Noise Channel Measurement Using A Vector Network Analyzer, Ahmed Moftah Ownalla Alshabo, Peter J. Vial, Montserrat Ros, David Stirling, Muhammad Abu Bakar Sidik Jan 2014

Ultra Wideband Noise Channel Measurement Using A Vector Network Analyzer, Ahmed Moftah Ownalla Alshabo, Peter J. Vial, Montserrat Ros, David Stirling, Muhammad Abu Bakar Sidik

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper, we analyze the measurement of ultra wideband (UWB) noise channels in different indoor environments. All measurements are done using a vector network analyzer (VNA) which allows us to measure the noise channel transfer functions. We find that the noise power of the system is decreased by increasing the intermediate frequency (IF) bandwidth which leads to an increase in time taken to perform measurements of the channels. Also, we measure the environmental noise power and find that it is slightly affected by fluorescent light sources inside the measurement environments. In addition, we find that the environmental noise is …

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