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Full-Text Articles in Engineering
Strategic Competences For Pricing Quantity Surveying Consultancy Services, Michael Adesi, De-Graft Owusu-Manu, Róisín Murphy
Strategic Competences For Pricing Quantity Surveying Consultancy Services, Michael Adesi, De-Graft Owusu-Manu, Róisín Murphy
Articles
Professional quantity surveying (QS) services are critical to successful delivery of construction projects within planned budget, quality, and duration. The supply of QS professional services is largely dependent on the price level of services and the willingness of clients to pay. The pricing of professional QS consultancy services has been confronted with a myriad of pricing challenges due to rapid changes in the business environment; the pervasive influence of information technology; and the complexity of clients’ expectation. It isthereforenecessary for QS consultancy firms to develop strategic competence for the pricing of their services. In addition, numerous studies have not given …
Improving Operator Situation Awareness By Phasor Measurement Unit (Pmu) Data Visualization, Esa M. Rantanen, Ernest Fokoue, Jacob Haut, Chandini Ramesh, Kathleen Gegner, Thomas Overbye, Komal Shetye
Improving Operator Situation Awareness By Phasor Measurement Unit (Pmu) Data Visualization, Esa M. Rantanen, Ernest Fokoue, Jacob Haut, Chandini Ramesh, Kathleen Gegner, Thomas Overbye, Komal Shetye
Articles
The application of phasor measurement unit (PMU) data in the power industry is currently an area of intense interest. The key driver for PMU technology is to use the precise time sources provided by Global Positioning System (GPS) satellites to accurately measure the relative voltage and current phase angles at buses across an interconnect at a very high sampling rate. Presenting PMU data to power system operators in a format that is truly useful for them and that affords improved situation awareness (SA) and fast and accurate decision making is a particular challenge to display design. This report describes development …
Emerging Technologies For The Pretreatment Of Lignocellulosic Biomass, Shady S. Hassan, Gwilym Williams, Amit Jaiswal
Emerging Technologies For The Pretreatment Of Lignocellulosic Biomass, Shady S. Hassan, Gwilym Williams, Amit Jaiswal
Articles
Pretreatment of lignocellulosic biomass to overcome its intrinsic recalcitrant nature prior to the production of valuable chemicals has been studied for nearly 200 years. Research has targeted eco-friendly, economical and time-effective solutions, together with a simplified large-scale operational approach. Commonly used pretreatment methods, such as chemical, physico-chemical and biological techniques are still insufficient to meet optimal industrial production requirements in a sustainable way. Recently, advances in applied chemistry approaches conducted under extreme and non-classical conditions has led to possible commercial solutions in the marketplace (e.g. High hydrostatic pressure, High pressure homogenizer, Microwave, Ultrasound technologies). These new industrial technologies are promising …
Secrecy And Randomness: Encoding Cloud Data Locally Using A One-Time Pad, Paul Tobin, Lee Edward Tobin, Mick Mckeever, Jonathan Blackledge
Secrecy And Randomness: Encoding Cloud Data Locally Using A One-Time Pad, Paul Tobin, Lee Edward Tobin, Mick Mckeever, Jonathan Blackledge
Articles
There is no secrecy without randomness, and we address poor cloud security using an analogue chaotic onetime pad encryption system to achieve perfect secrecy. Local encoding returns control to the client and makes stored cloud data unreadable to an adversary. Most cloud service providers encode client data using public encryption algorithms, but ultimately businesses and organisations are responsible for encoding data locally before uploading to the Cloud. As recommended by the Cloud Security Alliance, companies employing authentication and local encryption will reduce or eliminate, EU fines for late data breach discoveries when the EU implements the new general data protection …
An Yb3+-Ho3+ Codoped Glass Microsphere Laser In The 2.0Μm Wavelength Regions, Angzhen Li, Jibo Yu, Meng Zhang, Xiaosong Lu, Jiquan Zhang, Elfed Lewis, Gerald Farrell, Pengfei Wang
An Yb3+-Ho3+ Codoped Glass Microsphere Laser In The 2.0Μm Wavelength Regions, Angzhen Li, Jibo Yu, Meng Zhang, Xiaosong Lu, Jiquan Zhang, Elfed Lewis, Gerald Farrell, Pengfei Wang
Articles
In this letter, an Yb 3+ -Ho 3+ codoped sol-gel silica microsphere lasing at around 2.0 μm is reported. The gain microsphere is fabricated by overlaying the 1.0 mol% Yb 3+ -0.2 mol% Ho 3+ codoped sol-gel solution on the surface of a pure silica microsphere and is then heated using a CO 2 laser. Using a traditional fiber taper-microsphere coupling method, we observe the single- and multi-mode microsphere laser outputs around 2.0 μm using a 980 nm laser diode as a pump source, with a low threshold pumping power of 14.7 mW. The ability to fabricate sol-gel codoped silica …
A High-Temperature Humidity Sensor Based On A Singlemode-Side Polished Multimode-Singlemode Fiber Structure, Xianfan Wang, Ke Tian, Libo Yuan, Elfed Lewis, Gerald Farrell, Pengfei Wang
A High-Temperature Humidity Sensor Based On A Singlemode-Side Polished Multimode-Singlemode Fiber Structure, Xianfan Wang, Ke Tian, Libo Yuan, Elfed Lewis, Gerald Farrell, Pengfei Wang
Articles
A relative humidity (RH) sensor based on a simple singlemode-side polished multimode-singlemode (SSPMS) fiber hybrid structure is investigated, which is capable of working over a relatively high-temperature range, at which many RH sensors based on moisture sensitive material coatings cannot operate. The beam propagation method is used to analyze the light transmission characteristics within the side polished multimode fiber (SPMMF) structure. Experimental results show that the SPMMF surface roughness has a significant influence on the sensor's humidity sensing performance, as a result of the adsorption and desorption of water molecules along the side polished surface. A higher surface roughness results …
A High Sensitivity Temperature Sensor Based On Balloon-Shaped Bent Smf Structure With Its Original Polymer Coating, Ke Tian, Gerald Farrell, Elfed Lewis, Xianfan Wang, Haidong Liang, Pengfei Wang
A High Sensitivity Temperature Sensor Based On Balloon-Shaped Bent Smf Structure With Its Original Polymer Coating, Ke Tian, Gerald Farrell, Elfed Lewis, Xianfan Wang, Haidong Liang, Pengfei Wang
Articles
A high sensitivity optical fibre temperature sensor is demonstrated based on a balloon-shaped bent single-mode (BSBS) fibre structure where the fibre retains its original protective polymer coating. The BSBS fibre structure can be simply realized by bending a coated straight singlemode fibre into the balloon shape using a section of silica capillary tube. By adjusting the bending radius of the balloon-shaped fibre section, a modal interferometer between the core mode and the coating mode can be effectively implemented at a suitable bending radius. Considering the intrinsically high thermo-optical coefficient and thermal expansion coefficient of the polymer coating, the BSBS fibre …
Simultaneous Measurement Of Displacement And Temperature Based On Baloon - Shaped Bent Smf Structure Incorporating An Lpg, Ke Tian, Wenlei Yang, Gerald Farrell, Elfed Lewis, Xianfan Wang, Pengfei Wang
Simultaneous Measurement Of Displacement And Temperature Based On Baloon - Shaped Bent Smf Structure Incorporating An Lpg, Ke Tian, Wenlei Yang, Gerald Farrell, Elfed Lewis, Xianfan Wang, Pengfei Wang
Articles
Abstract—A novel optical fibre sensor based on a balloon-shaped bent single-mode (BSBS) fibre structure incorporating a long-period grating (LPG) for simultaneous measurement of displacement and temperature is described and experimentally demonstrated. The sensor is fabricated by splicing a BSBS fibre structure formed Mach-Zehnder interferometer (MZI) with an LPG. Due to the interference dip which is formed by the BSBS fibre structure is sensitive to external displacement and temperature variation, while that formed by LPG only depends on temperature, displacement and temperature therefore can be unambiguously and simultaneously measured by this sensor. Experimental results show that this sensor offers a high …
Influence Of Atmospheric Clearness On Pdlc Switchable Glazing Transmission, Aritra Ghosh, Brian Norton, Tapas K. Mallick
Influence Of Atmospheric Clearness On Pdlc Switchable Glazing Transmission, Aritra Ghosh, Brian Norton, Tapas K. Mallick
Articles
Electrically activated switchable polymer dispersed liquid crystal (PDLC) is suitable for adaptive windows. A particular type requires 20V to become 71% transparent while in the absence of power it is 27% transparent. Glazing transmission changes with light incident angle. As the clearness of a sky changes the fraction changes alter of direct insolation (that has an azimuthally changing incident) and diffuse insolation (that has a largely constant incident). Thus, the effective overall incident angle determining the glazing transmittance also changes. In this work for the first time, the variation of PDLC glazing transmission with clearness index has been investigated.
Versatile Soliton Emission From A Ws2 Mode-Locked Fiber Laser, Bo Guo, Shi Li, Ya-Xian Fan, Pengfei Wang
Versatile Soliton Emission From A Ws2 Mode-Locked Fiber Laser, Bo Guo, Shi Li, Ya-Xian Fan, Pengfei Wang
Articles
Recently, few-layer tungsten disulfide (WS2), as a shining 2D material, has been discovered to possess both the saturable absorption ability and large nonlinear refractive index. Here, we demonstrate versatile soliton pulses in a passively mode-locked fiber laser with a WS2-deposited microfiber. The few-layer WS2 is prepared by the liquid-phase exfoliation method and transferred onto a microfiber by the optical deposition method. Study found, the WS2-deposited microfiber can operate simultaneously as a mode-locker and a high-nonlinear device. In experiment, by further inserting the WS2 device into the fiber laser, besides the dual-wavelength soliton, noise-like soliton pulse, conventional soliton and its harmonic …
Fabrication And Characterization Of A Magnetized Metal-Encapsulated Fbg Sensor For Structural Health Monitoring, Sagar Jinachandran, Huijun Li, Jiangtao Xi, B. Gangadhara Prusty, Yuliya Semenova, Gerald Farrell, Ginu Rajan
Fabrication And Characterization Of A Magnetized Metal-Encapsulated Fbg Sensor For Structural Health Monitoring, Sagar Jinachandran, Huijun Li, Jiangtao Xi, B. Gangadhara Prusty, Yuliya Semenova, Gerald Farrell, Ginu Rajan
Articles
A novel means of metal packaging of a fiber Bragg grating (FBG) sensor using stainless steel and tin, together with high temperature resistant samarium cobalt (SmCo) magnet is proposed in this paper. The inclusion of high temperaturecapable SmCo magnets enable the metal packaging of the FBG sensor with magnetic capabilities. This packaged sensor can be placed in direct contact with the substrate structures such as iron pipelines and other ferromagnetic components without any adhesives, making them easily detachable and reusable. This is a significant improvement compared with other commercial fiber optic sensors which are, surface attached using epoxies or welded …
Non-Crossing Partitions And Milnor Fibers, Colum Watt, Michael Falk, Thomas Brady
Non-Crossing Partitions And Milnor Fibers, Colum Watt, Michael Falk, Thomas Brady
Articles
For a finite real reflection group, W, we use non-crossing partitions of type W to construct a finite cell complex with the homotopy type of the Milnor fiber of the associated W–discriminant, Δ_W, and another with the homotopy type of the Milnor fiber of the defining polynomial of the associated reflection arrangement. These complexes support natural cyclic group actions realizing the geometric monodromy. Using the shellability of the non-crossing partition lattice, this cell complex yields a chain complex of homology groups computing the integral homology of the Milnor fiber of Δ_W.
Toxicity Screening Of Biochar-Mineral Composites Using Germination Tests, Jan Mumme, Josephine Getz, Munoo Prasad, Ulf Lüder, Kern Jurgen, Ondrej Masek, Wolfram Buss
Toxicity Screening Of Biochar-Mineral Composites Using Germination Tests, Jan Mumme, Josephine Getz, Munoo Prasad, Ulf Lüder, Kern Jurgen, Ondrej Masek, Wolfram Buss
Articles
This study assessed the properties and toxicity (water cress germination trials) of 38 waste-derived, novel biochar-mineral composites (BMCs) produced via slow pyrolysis and hydrothermal carbonization (hydrochars). The biochars were produced from sewage sludge and compost-like output (CLO) by varying the type of mineral additive (zeolite, wood ash and lignite fly ash), the mineral-to-feedstock ratio and the carbonization process. While pure hydrochars completely inhibited germination of water cress, this effect was ameliorated by mineral additives. Seedlings grew best in pyrolysis chars and while wood ash addition decreased plant growth in many cases, 1:10 addition to CLO doubled germination rate. The factors …
An Energy-Based Approach To Assess And Predict Erosive Airfoil Defouling, Arthur Rudek, Thomas-Alexander Zitzmann, Geral Russ, Barry Duignan
An Energy-Based Approach To Assess And Predict Erosive Airfoil Defouling, Arthur Rudek, Thomas-Alexander Zitzmann, Geral Russ, Barry Duignan
Articles
A dynamic indentation experiment is presented for assessment of the adhesive behavior of a range of coatings in erosive defouling of commercial aircraft engines using CO2 dry-ice. A series of experiments is presented in which particles made from a reference material (polyoxymethylene – POM) and from CO2 dry-ice are made to impact compressor airfoils under a range of impact angle and velocity conditions. The airfoils investigated are coated with an indicator material (PTFE), which is typically used to visualise the defouling effect in large scale compressor defouling experiments. In addition, fouled compressor airfoils taken from service and coated with a …
A Constructivist Approach To The Use Of Case Studies In Teaching Engineering Ethics, Diana Adela Martin, Eddie Conlon, Brian Bowe
A Constructivist Approach To The Use Of Case Studies In Teaching Engineering Ethics, Diana Adela Martin, Eddie Conlon, Brian Bowe
Articles
Our paper aims to explore the effectiveness of a constructivist approach to the teaching of engineering ethics through case studies, by putting forward a contextualization of the much discussed case study “Cutting Road Side Trees” (Pritchard, 1992) in light of the constructivist frame suggested by Jonassen (1999). First, we briefly analyse how the use of case studies for the teaching of engineering ethics eludes the complexity of the engineering professional environment before arguing that constructivism is a learning theory that can help to address this complexity. The final section proposes a constructivist reworking of the case method in a manner …
Introducing A New Cement Hydration And Microstructure Model, Niall Holmes
Introducing A New Cement Hydration And Microstructure Model, Niall Holmes
Articles
This paper presents a new cement hydration model (HYDCEM) to predict the microstructure evolution of hydrating tricalcium silicate (C3S). The model is written in MATLAB and employs the continuum approach and integrated particle kinetics relationships to show the change in C3S and the growth of Calcium Silicate Hydrate (C-S-H) and Calcium Hydroxide (CH) in the pore space over time. Cement hydration is a highly complex process. While hydration models should never completely remove experimental analysis, they are an aid to better understand cement hydration and microstructure development by providing a method to analyse a large number of pastes with different …
Microdisk Resonator With Negative Thermal Optical Coefficient Polymer For Refractive Index Sensing With Thermal Stability, Tao Ma, Jinhui Yuan, Feng Li, Lei Sun, Zhe Kang, Binbin Yan, Qiang Wu, Xinzhu Sang, Heng Liu, Fang Wang, Bo Wu, Chongxiu Yu, Gerald Farrell
Microdisk Resonator With Negative Thermal Optical Coefficient Polymer For Refractive Index Sensing With Thermal Stability, Tao Ma, Jinhui Yuan, Feng Li, Lei Sun, Zhe Kang, Binbin Yan, Qiang Wu, Xinzhu Sang, Heng Liu, Fang Wang, Bo Wu, Chongxiu Yu, Gerald Farrell
Articles
In this paper, we propose a microdisk resonator with negative thermal optical coefficient (TOC) polymer for refractive index (RI) sensing with thermal stability. The transmission characteristics and sensing performances by using quasi-TE01 and quasi-TM01 modes are simulated by a three-dimensional finite element method. The influences of the TOC, RI, and thickness of the polymer on the sensing performances are also investigated. The simulation results show that the RI sensitivity Sn and temperature sensitivity ST with different polymers are in the ranges of 25.1-26 nm/RIU and 67.3-75.2 pm/K for the quasi-TE01 mode, and 94.5-110.6 nm/RIU and 1.2-51.3 pm/K for the quasi-TM01 …
Compound Glass Microsphere Resonator Devices, Jibo Yu, Elfed Lewis, Gerald Farrell, Pengfei Wang
Compound Glass Microsphere Resonator Devices, Jibo Yu, Elfed Lewis, Gerald Farrell, Pengfei Wang
Articles
In recent years, compound glass microsphere resonator devices have attracted increasing interest and have been widely used in sensing, microsphere lasers, and nonlinear optics. Compared with traditional silica resonators, compound glass microsphere resonators have many significant and attractive properties, such as high-Q factor, an ability to achieve high rare earth ion, wide infrared transmittance, and low phonon energy. This review provides a summary and a critical assessment of the fabrication and the optical characterization of compound glasses and the related fabrication and applications of compound glass microsphere resonators.
The Social, Educational, And Market Scenario For Nzeb In Europe, Evangelia Topriska, Maria Kolokotroni, Daniela Melandri, Simon Mcguinness, Andrei Ceclan, Georgios C. Christoforidis, Fazio Vittoria, Maria Hadjpannayi, Patrick Hendrick, Marija Kacarska, López Lopez, Kaj Leonhart Petersen, Jutta Steinbrecher
The Social, Educational, And Market Scenario For Nzeb In Europe, Evangelia Topriska, Maria Kolokotroni, Daniela Melandri, Simon Mcguinness, Andrei Ceclan, Georgios C. Christoforidis, Fazio Vittoria, Maria Hadjpannayi, Patrick Hendrick, Marija Kacarska, López Lopez, Kaj Leonhart Petersen, Jutta Steinbrecher
Articles
Nearly Zero Energy Buildings (nZEB) are a significant part of the energy efficiency strategy of the European Union. As buildings represent approximately 40% of the final energy use in Europe, the reduction of their energy demand is key for a sustainable future. This paper takes a qualitative approach and presents data about professional and market barriers, as well as the educational market in relation to the implementation of nZEB policies for new and retrofit buildings in 11 European countries. Different levels of policy enactments and market penetration are reported and are generally found to be more advanced in western and …
Multiband Slot-Loaded Dipole Antenna For Wlan And Lte-A Applications, Samir Salem Al-Bawri, Mohd. Faizal Jamlos, Ping Jack Soh, Syed Alwee Aljunid Syed Junid, Mohd Aminudin Jamlos, Adam Narbudowicz
Multiband Slot-Loaded Dipole Antenna For Wlan And Lte-A Applications, Samir Salem Al-Bawri, Mohd. Faizal Jamlos, Ping Jack Soh, Syed Alwee Aljunid Syed Junid, Mohd Aminudin Jamlos, Adam Narbudowicz
Articles
A multiband printed dipole antenna for wireless local area network (WLAN) and long-term evolution-advanced (LTEA) applications is investigated here. Its multiband characteristic is enabled by the Y-slot present in the upper arm of the dipole, while the antenna's dimensions are 0.08λo × 0.384λo at the lowest operating frequency. It features bandwidth of 14.6% centred at 2.4 GHz, and ∼30.5% centred at 5.5 GHz for WLAN operation. An additional bandwidth of 6.9% centred at 3.5 GHz supporting LTE-A applications is also featured. Besides being compact, the proposed antenna radiates omnidirectionally with a gain of up to 4.09 dBi. Simulations and measurements …
Low-Cost Multimode Patch Antenna For Dual Mimo And Enhanced Localization Use, Adam Narbudowicz, Max Ammann
Low-Cost Multimode Patch Antenna For Dual Mimo And Enhanced Localization Use, Adam Narbudowicz, Max Ammann
Articles
This paper proposes a simple, low-cost multi-mode patch antenna combining good MIMO performance with precise Angle of Arrival (AoA) estimation. The AoA is based on the monopulse antenna concept, however, unlike in radar applications, the necessity for complex circuitry is replaced by the intrinsic properties of even and odd resonant patch modes. This capability is advantageous for future “Internet of Things” antennas, embedded into low-cost and size-constrained devices. The envelope correlation coefficient, measured in an anechoic chamber, is below 1.5 %, ensuring good MIMO performance. An exemplary addition to localization algorithm exploiting antenna properties is demonstrated.
Voltage Distortion Mitigation In A Distributed Generation-Integrated Weak Utility Network Via A Self-Tuning Filter-Based Dynamic Voltage Restorer, Samet Biricik, Shafiuzzaman Khadem, Soydan Redif, Malabika Basu
Voltage Distortion Mitigation In A Distributed Generation-Integrated Weak Utility Network Via A Self-Tuning Filter-Based Dynamic Voltage Restorer, Samet Biricik, Shafiuzzaman Khadem, Soydan Redif, Malabika Basu
Articles
The dynamic voltage restorer (DVR) is mainly used in a utility grid to protect sensitive loads from power quality problems, such as voltage sags and swells. However, the effectiveness of the DVR can wane under unbalanced grid voltage conditions. Recently, DVR control algorithms have been developed that enable the elimination of voltage harmonics in weak and distorted utility networks. This paper presents a modified control method for the DVR, which can (1) compensate the voltage swell and (2) eliminate the voltage harmonics in a combined utility condition consisting of voltage unbalance and harmonic distortion. A self-tuning filter (STF) is used …
Passive Self-Interference Suppression For Single Channel Full-Duplex Operation, Adam Narbudowicz, Giuseppe Ruvio, Max Ammann
Passive Self-Interference Suppression For Single Channel Full-Duplex Operation, Adam Narbudowicz, Giuseppe Ruvio, Max Ammann
Articles
Full duplex radios have become a topic of increased interest in the wireless communications community. As part of this development, many efforts were directed to passively decrease the self-interference level at the antenna outputs. However, in many proposed solutions transmission and reception occur through different propagation channels. This paper demonstrates and quantifies the negative impact of channel differentiation on pivotal applications of full-duplex radio, such as cognitive radio. Antenna designs used for self-interference suppression in full-duplex radio architectures are analyzed. In order to ensure that transmission and reception occur within the same propagation channel, the use of the envelope correlation …
Self-Healing Asphalt Review: From Idea To Practice, S. Xu, Alvaro García, Junfeng Su, Quantao Liu, Amir Tabakovic, Erik Schlangen
Self-Healing Asphalt Review: From Idea To Practice, S. Xu, Alvaro García, Junfeng Su, Quantao Liu, Amir Tabakovic, Erik Schlangen
Articles
With the advantages of cost efficiency, noise reduction, and comfort driving experience, asphalt is widely used as a binding material in pavement engineering. However, after years of serving, asphalt concrete gets damaged under cyclic vehicle loading. Meanwhile, due to environmental effects including ageing and moisture damage, asphalt binder becomes brittle with time. As a result, microcracks initiate and grow into larger scales, which accelerates the damaging process and finally leads to distresses like raveling, potholes, cracking, and so on. In 1967, Bazin and Saunier[1] witnessed and reported a temperature related healing phenomenon in asphalt mix after loadings. After that, the …
Maritime Spatial Planning Supported By Infrastructure For Spatial Information In Europe (Inspire), Andrej Abramic, Emanuele Bigagli, Vittorio Barale, Alberto Lorenzo-Alonso, Conor Norton
Maritime Spatial Planning Supported By Infrastructure For Spatial Information In Europe (Inspire), Andrej Abramic, Emanuele Bigagli, Vittorio Barale, Alberto Lorenzo-Alonso, Conor Norton
Articles
The implementation of Directive 2007/2/EC - INSPIRE can improve and actually strengthen the informationmanagement and data infrastructures needed for setting up Maritime Spatial Planning (MSP) processes. Evidencefor this comes from three parallel analyses: links between the MSP Framework Directive and INSPIRE compo-nents and implementation; the availability of marine and maritime data through the INSPIRE Geo-Portal; andthe adequacy of using an INSPIRE data model for mapping maritime spatial plans. Thefirst item identifiesINSPIRE as a relevant instrument not only for data collection, but additionally for increasing transparency of theMSP processes, using already operational national and European data infrastructure. The marine/maritime dataavailability analysis …
Thermo-Optic Tuning Of A Packaged Whispering Gallery Mode Resonator Filled With Nematic Liquid Crystal, Vishnu Kavungal, Gerald Farrell, Qiang Wu, Arun Mallik, Yuliya Semenova
Thermo-Optic Tuning Of A Packaged Whispering Gallery Mode Resonator Filled With Nematic Liquid Crystal, Vishnu Kavungal, Gerald Farrell, Qiang Wu, Arun Mallik, Yuliya Semenova
Articles
Thermo-optic tuning of whispering gallery modes (WGMs) in a nematic liquid crystal-filled thin-walled capillary tube resonator is reported. WGMs were excited by the evanescent field from a tapered optical fiber. Tapered optical fiber fabrication and reduction of wall thickness of the capillary tube was carried out by a ceramic micro-heater brushing technique. A simple and robust packaging technique is demonstrated to ensure stable and repeatable operation of the device. Tunability of WGMs with temperature was demonstrated with a sensitivity of 267.5 ± 2.5 pm/°C. The demonstrated thermo-optic method for WGMs tuning is potentially useful for many tunable photonic devices and …
Highly Sensitive Twist Sensor Based On Partially Silver Coated Hollow Core Fiber Structure, Dejun Liu, Rahul Kumar, Fangfang Wei, Wei Han, Arun Mallik, Jinhui Yuan, Chongxiu Yu, Feng Li, Zhengyong Liu, Hwa-Yaw Tam, Gerald Farrell, Yuliya Semenova, Qiang Wu
Highly Sensitive Twist Sensor Based On Partially Silver Coated Hollow Core Fiber Structure, Dejun Liu, Rahul Kumar, Fangfang Wei, Wei Han, Arun Mallik, Jinhui Yuan, Chongxiu Yu, Feng Li, Zhengyong Liu, Hwa-Yaw Tam, Gerald Farrell, Yuliya Semenova, Qiang Wu
Articles
Interferometer based on multiple beam interferences inside a hollow core fiber (HCF) structure (also known as an antiresonant reflecting optical waveguide) has been attracting interest of many researchers due to its periodic transmission spectrum containing high quality factor spectral dips. Functionalized HCF structures have been demonstrated for a wide range of applications in humidity, magnetic field, and biosensing. Here, we report a new application of the HCF-based structure with a partial silver coating layer for sensing of twist. It is configured by a fusion splicing a section of 4.5-mm long HCF between two standard single mode fibers (SMFs), followed by …
A Pseudo-Microsimulation Approach For Modelling Congested Traffic Loading On Long-Span Bridges, Colm Carey, Colin Caprani, Bernard Enright
A Pseudo-Microsimulation Approach For Modelling Congested Traffic Loading On Long-Span Bridges, Colm Carey, Colin Caprani, Bernard Enright
Articles
This paper investigates congested traffic loading on long-span bridges through the use of traffic microsimulation. Six months of Weigh-In-Motion free-flow traffic data (including cars) are used as input for the microsimulation of congested traffic. Key parameters that affect traffic loading are identified in the output of the microsimulation, and these parameters form the basis for a more computationally efficient ‘pseudo-microsimulation of congested traffic’ (PMCT) model. This PMCT model is shown to replicate the traffic loading from full microsimulation accurately and allows long-run simulations, equivalent to 1000 years of congested traffic, to be performed with an acceptably short duration. This reduces …
Highly Sensitive Displacement Sensor Based On Composite Interference Established Within A Balloon-Shaped Bent Multimode Fiber Structure, Ke Tian, Gerald Farrell, Xianfan Wang, Elfed Lewis, Pengfei Wang
Highly Sensitive Displacement Sensor Based On Composite Interference Established Within A Balloon-Shaped Bent Multimode Fiber Structure, Ke Tian, Gerald Farrell, Xianfan Wang, Elfed Lewis, Pengfei Wang
Articles
A novel optical fiber displacement sensor based on composite interference established within a balloon-shaped bent multimode (BSBM) fiber structure is described and experimentally demonstrated. The BSBM fiber structure is realized by bending a straight single-mode–multimode–single-mode (SMS) fiber structure into a balloon shape using a length of capillary tube to fix the shape of the structure. Owing to the bend in the multimode waveguide, the original undistorted multimode interference pattern is changed, and an extra Mach–Zehnder interferometer is effectively introduced within the multimode fiber (MMF) section at a suitable bending radius. This established composite interference greatly improves the displacement sensing performance …
Validating A Reduced-Order Model For Synthetic Jet Actuators Using Cfd And Experimental Data, Tim Persoons, Rick Cressall, Aliimohammadi Sajad
Validating A Reduced-Order Model For Synthetic Jet Actuators Using Cfd And Experimental Data, Tim Persoons, Rick Cressall, Aliimohammadi Sajad
Articles
Synthetic jet actuators (SJA) are emerging in various engineering applications, from flow separation and noise control in aviation to thermal management of electronics. A SJA oscillates a flexible membrane inside a cavity connected to a nozzle producing vortices. A complex interaction between the cavity pressure field and the driving electronics can make it difficult to predict performance. A reduced-order model (ROM) has been developed to predict the performance of SJAs. This paper applies this model to a canonical configuration with applications in flow control and electronics cooling, consisting of a single SJA with a rectangular orifice, emanating perpendicular to the …