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Articles 1 - 17 of 17
Full-Text Articles in Engineering
Bimetallic Non-Alloyed Nps For Improving The Broadband Optical Absorption Of Thin Amorphous Silicon Substrates, Chee L. Tan, Sung J. Jang, Young M. Song, Kamal Alameh, Yong T. Lee
Bimetallic Non-Alloyed Nps For Improving The Broadband Optical Absorption Of Thin Amorphous Silicon Substrates, Chee L. Tan, Sung J. Jang, Young M. Song, Kamal Alameh, Yong T. Lee
Research outputs 2014 to 2021
We propose the use of bimetallic non-alloyed nanoparticles (BNNPs) to improve the broadband optical absorption of thin amorphous silicon substrates. Isolated bimetallic NPs with uniform size distribution on glass and silicon are obtained by depositing a 10-nm Au film and annealing it at 600°C; this is followed by an 8-nm Ag film annealed at 400°C. We experimentally demonstrate that the deposition of gold (Au)-silver (Ag) bimetallic non-alloyed NPs (BNNPs) on a thin amorphous silicon (a-Si) film increases the film's average absorption and forward scattering over a broad spectrum, thus significantly reducing its total reflection performance. Experimental results show that Au-Ag …
Room-Temperature Spin-Polarized Organic Light-Emitting Diodes With A Single Ferromagnetic Electrode, Baofu Ding, Qunliang Song, Kamal Alameh
Room-Temperature Spin-Polarized Organic Light-Emitting Diodes With A Single Ferromagnetic Electrode, Baofu Ding, Qunliang Song, Kamal Alameh
Research outputs 2014 to 2021
In this paper, we demonstrate the concept of a room-temperature spin-polarized organic light-emitting diode (Spin-OLED) structure based on (i) the deposition of an ultra-thin p-type organic buffer layer on the surface of the ferromagnetic electrode of the Spin-OLED and (ii) the use of oxygen plasma treatment to modify the surface of that electrode. Experimental results demonstrate that the brightness of the developed Spin-OLED can be increased by 110% and that a magneto-electroluminescence of 12% can be attained for a 150 mT in-plane magnetic field, at room temperature. This is attributed to enhanced hole and room-temperature spin-polarized injection from the ferromagnetic …
Growth, Characterisation, And Properties Of Bi1.8lu1.2fe3.6al1.4o12 Garnet Films Prepared Using Two Different Substrate Temperatures, Mohammad Alam, Mikhail Vasiliev, Kamal Alameh
Growth, Characterisation, And Properties Of Bi1.8lu1.2fe3.6al1.4o12 Garnet Films Prepared Using Two Different Substrate Temperatures, Mohammad Alam, Mikhail Vasiliev, Kamal Alameh
Research outputs 2014 to 2021
We prepare highly Bismuth substituted iron garnet of composition type Bi1.8Lu1.2Fe3.6Al1.4O12 by using low and high substrate temperatures (250°C and 680°C) during the deposition process inside the vacuum chamber of RF magnetron sputtering system. The crystallisation process of this garnet type thin film materials are performed by means of optimised high temperature oven annealing process and conduct several characterisation techniques to obtain and evaluate their properties. All the optimally annealed samples possess very promising and attractive properties. Comparatively low coercive force (below 15 Oe) is achieved in garnet films prepared at …
Recent Developments In R.F. Magnetron Sputtered Thin Films For Ph Sensing Applications - An Overview, Devendra Maurya, Ali Sardarinejad, Kamal Alameh
Recent Developments In R.F. Magnetron Sputtered Thin Films For Ph Sensing Applications - An Overview, Devendra Maurya, Ali Sardarinejad, Kamal Alameh
Research outputs 2014 to 2021
pH sensors are widely used in chemical and biological applications. Metal oxides-based pH sensors have many attractive features including insolubility, stability, mechanical strength, electrocatalyst and manufacturing technology. Various metal oxide thin films prepared by radio frequency (R.F.) magnetron sputtering have attractive features, including high pH sensitivity, fast response, high resolution, good stability and reversibility as well as potential for measuring pH under conditions that are not favourable for the commonly used glass electrodes-based pH sensors. In addition, thin film pH sensors prepared by R.F. magnetron sputtering offer many advantages, such as ease of packaging, low cost through the use of …
Performance Evaluation Of A Technology Independent Security Gateway For Next Generation Networks, Fudong Li, Nathan Clarke, Steven Furnell, Is-Mkwawa Mkwawa
Performance Evaluation Of A Technology Independent Security Gateway For Next Generation Networks, Fudong Li, Nathan Clarke, Steven Furnell, Is-Mkwawa Mkwawa
Research outputs 2014 to 2021
With the all IP based Next Generation Networks being deployed around the world, the use of real-time multimedia service applications is being extended from normal daily communications to emergency situations. However, currently different emergency providers utilise differing networks and different technologies. As such, conversations could be terminated at the setup phase or data could be transmitted in plaintext should incompatibility issues exit between terminals. To this end, a novel security gateway that can provide the necessary security support for incompatible terminals was proposed, developed and implemented to ensure the successful establishment of secure real-time multimedia conversations. A series of experiments …
Recent Developments In Magneto-Optic Garnet-Type Thin-Film Materials Synthesis, Mohammad Nur-E-Alam, Mikhail Vasiliev, Viacheslav Kotov, Kamal Alameh
Recent Developments In Magneto-Optic Garnet-Type Thin-Film Materials Synthesis, Mohammad Nur-E-Alam, Mikhail Vasiliev, Viacheslav Kotov, Kamal Alameh
Research outputs 2014 to 2021
Magneto-optic (MO) garnets are used in a range of applications in nanophotonics, integrated optics, communications and imaging. Bi-substituted iron garnets of different compositions are the most useful class of materials in applied magnetooptics due to their excellent MO properties (large Faraday effect) and record-high MO figure of merit among all semitransparent dielectrics. It is highly desirable to synthesise garnets which possess simultaneously a high MO figure of merit and large uniaxial magnetic anisotropy. However, the simultaneous optimization of several material properties and parameters can be difficult in single-layer garnet thin films, and it is also challenging to prepare films with …
Synergistic Toughening Of Hard, Nacre-Mimetic Mosi2 Coatings By Self-Assembled Hierarchical Structure, Jiang Xu, Xiaoli Zhao, Paul Munroe, Zonghan Xie
Synergistic Toughening Of Hard, Nacre-Mimetic Mosi2 Coatings By Self-Assembled Hierarchical Structure, Jiang Xu, Xiaoli Zhao, Paul Munroe, Zonghan Xie
Research outputs 2014 to 2021
Like many other intermetallic materials, MoSi2 coatings are typically hard, but prone to catastrophic failure due to their low toughness at ambient temperature. In this paper, a self-assembled hierarchical structure that closely resembles that of nacre (i.e., mother of pearl) was developed in a MoSi2 -based coating through a simple, yet cost-effective, depostion technique. The newly formed coating is tough and can withstand multiple indentations at high loads. Key design features responsible for this remarkable outcome were identified. They include a functionally graded multilayer featuring elastic modulus oscillation, varying sublayer thickness and a columnar structure that are able to attenuate …
Simultaneous Monitoring Of Singlet And Triplet Exciton Variations In Solid Organic Semiconductors Driven By An External Static Magnetic Field, Baofu Ding, Kamal Alameh
Simultaneous Monitoring Of Singlet And Triplet Exciton Variations In Solid Organic Semiconductors Driven By An External Static Magnetic Field, Baofu Ding, Kamal Alameh
Research outputs 2014 to 2021
The research field of organic spintronics has remarkably and rapidly become a promising research area for delivering a range of high-performance devices, such as magnetic-field sensors, spin valves, and magnetically modulated organic light emitting devices (OLEDs). Plenty of microscopic physical and chemical models based on exciton or charge interactions have been proposed to explain organic magneto-optoelectronic phenomena. However, the simultaneous observation of singlet- and triplet-exciton variations in an external magnetic field is still unfeasible, preventing a thorough theoretical description of the spin dynamics in organic semiconductors. Here, we show that we can simultaneously observe variations of singlet excitons and triplet …
Constant-Stress Accelerated Life Test Of White Organic Light-Emitting Diode Based On Least Square Method Under Weibull Distribution, J Zhang, C Liu, G Cheng, X Chen, J Wu, Q Zhu, Laichang Zhang
Constant-Stress Accelerated Life Test Of White Organic Light-Emitting Diode Based On Least Square Method Under Weibull Distribution, J Zhang, C Liu, G Cheng, X Chen, J Wu, Q Zhu, Laichang Zhang
Research outputs 2014 to 2021
It is currently hard to estimate the reliability parameters of organic light-emitting diodes (OLEDs) when conducting a life test at normal stress, due to the remarkably improved life of OLEDs to thousands hours. This work adopted three constant-stress accelerated life tests (CSALTs) to predict the life of white OLEDs in a short time. The Weibull function was applied to describe the life distribution, and the shape and scale parameters were estimated using the least square method. The experimental test data were statistically analyzed using a self-developed software. The life of white OLEDs predicted via this software is in good agreement …
Characterizing The Resolvability Of Real Superluminescent Diode Sources For Application To Optical Coherence Tomography Using A Low Coherence Interferometry Model, Paul V. Jansz, Steven Richardson, Graham Wild, Steven Hinckley
Characterizing The Resolvability Of Real Superluminescent Diode Sources For Application To Optical Coherence Tomography Using A Low Coherence Interferometry Model, Paul V. Jansz, Steven Richardson, Graham Wild, Steven Hinckley
Research outputs 2014 to 2021
The axial resolution is a critical parameter in determining whether optical coherent tomography (OCT) can be used to resolve specific features in a sample image. Typically, measures of resolution have been attributed to the light source characteristics only, including the coherence length and the point spread function (PSF) width of the OCT light sources. The need to cost effectively visualize the generated PSF and OCT cross-correlated interferogram (A-scan) using many OCT light sources have led to the extrinsic evolution of the OCT simulation model presented. This research indicated that empirical resolution in vivo, as well as depending on the light …
Spectrally-Selective All-Inorganic Scattering Luminophores For Solar Energy-Harvesting Clear Glass Windows, Ramzy Alghamedi, Mikhail Vasiliev, Mohammad Alam, Kamal Alameh
Spectrally-Selective All-Inorganic Scattering Luminophores For Solar Energy-Harvesting Clear Glass Windows, Ramzy Alghamedi, Mikhail Vasiliev, Mohammad Alam, Kamal Alameh
Research outputs 2014 to 2021
All-inorganic visibly-transparent energy-harvesting clear laminated glass windows are the most practical solution to boosting building-integrated photovoltaics (BIPV) energy outputs significantly while reducing cooling- and heating-related energy consumption in buildings. By incorporating luminophore materials into lamination interlayers and using spectrally-selective thin-film coatings in conjunction with CuInSe2 solar cells, most of the visible solar radiation can be transmitted through the glass window with minimum attenuation while ultraviolet (UV) radiation is down-converted and routed together with a significant part of infrared radiation to the edges for collection by solar cells. Experimental results demonstrate a 10 cm × 10 cm vertically-placed energy-harvesting clear …
Magnetophotonic Intensity Effects In Hybrid Metal-Dielectric Structures, V I. Belotelov, L E. Kreilkamp, A N. Kalish, I A. Akimov, D A. Bykov, S Kasture, V J. Yallapragada, A V. Gopal, A M. Grishin, S I. Khartsev, Mohammad Nurealam, Mikhail Vasiliev, L L. Doskolovich, D R. Yakovlev, Kamal Alameh, A K. Zvezdin, M Bayer
Magnetophotonic Intensity Effects In Hybrid Metal-Dielectric Structures, V I. Belotelov, L E. Kreilkamp, A N. Kalish, I A. Akimov, D A. Bykov, S Kasture, V J. Yallapragada, A V. Gopal, A M. Grishin, S I. Khartsev, Mohammad Nurealam, Mikhail Vasiliev, L L. Doskolovich, D R. Yakovlev, Kamal Alameh, A K. Zvezdin, M Bayer
Research outputs 2014 to 2021
The magneto-optical properties of a hybrid metal-dielectric structure consisting of a one-dimensional gold grating on top of a magnetic waveguide layer are studied experimentally and theoretically. It is demonstrated that a magnetic field applied in the longitudinal configuration (in the plane of the magnetic film and perpendicular to the slits in the gold grating) to the metal-dielectric structure modifies the field distribution of the optical modes and thus changes the mode excitation conditions. In the optical far field, this manifests in the alteration of the optical transmittance or reflectance when the structure becomes magnetized. This magneto-optical effect is shown to …
Application Of A Superconducting Magnetic Energy Storage Unit For Power Systems Stability Improvement, Embaiya Salih, Stefan Lachowicz, Octavian Bass, Daryoush Habibi
Application Of A Superconducting Magnetic Energy Storage Unit For Power Systems Stability Improvement, Embaiya Salih, Stefan Lachowicz, Octavian Bass, Daryoush Habibi
Research outputs 2014 to 2021
A superconducting Magnetic Energy Storage (SMES) includes a high inductance coil that can act as a constant source of direct current. A SMES unit connected to a power system is able to absorb and store both active and reactive power from this system and to inject these powers into this system when they are needed. The injected power can be controlled by changing both the duty cycle of the dc-dc chopper switches and its operation modes. A SMES is always associated with a power conversion system consisting of two identical converters connected by a de link capacitor. This paper presents …
Investigating Strain Transfer In Polymer Coated Structures For The Health Monitoring Of Aerospace Vehicles Using Polymer Photonic Waveguides, Graham Wild, Bronwyn Fox, Kevin Magniez, Steven Hinckley, Scott Wade, G Carman
Investigating Strain Transfer In Polymer Coated Structures For The Health Monitoring Of Aerospace Vehicles Using Polymer Photonic Waveguides, Graham Wild, Bronwyn Fox, Kevin Magniez, Steven Hinckley, Scott Wade, G Carman
Research outputs 2014 to 2021
In this work, we present the concept of planar polymer photonic waveguides for the health monitoring of aerospace structures. Here a polymer layer is deposited onto the material/structure to be monitored. Within the polymer layer, waveguides are created after deposition. These waveguides can then be used as 'optical fibres' for optical fibre sensing methodologies. In investigating the use of polymer photonic waveguides the question to be answered is: does the strain in the test material transfer to the polymer layer, such that the value to be measured optically is reliable and indicative of the true strain in the test structure? …
Remote Beehive Monitoring Using Acoustic Signals, Amro Qandour, Iftekhar Ahmad, Daryoush Habibi, Mark Leppard
Remote Beehive Monitoring Using Acoustic Signals, Amro Qandour, Iftekhar Ahmad, Daryoush Habibi, Mark Leppard
Research outputs 2014 to 2021
Recent developments in Wireless Sensor Networks (WSNs) have led to their use in remote data acquisition and automatic data analysis applications, which have proven to be an invaluable tool in a diverse range of fields including biosecurity. Further indications have been found that honeybee health can be monitored and determined through the use of acoustic analysis. In this paper, we present a system that has the ability to remotely detect the presence of pest infestation on a colony of honeybees by comparing the acoustic fingerprint of a hive to a fingerprint of known status. This will aid the goals of …
Bulk Tib2-Based Ceramic Composites With Improved Mechanical Property Using Fe-Ni-Ti-Al As A Sintering Aid, Chao Yang, Hao Guo, Mo Daguang, Shengguan Qu, Xiaoqiang Li, Weiwen Zhang, Laichang Zhang
Bulk Tib2-Based Ceramic Composites With Improved Mechanical Property Using Fe-Ni-Ti-Al As A Sintering Aid, Chao Yang, Hao Guo, Mo Daguang, Shengguan Qu, Xiaoqiang Li, Weiwen Zhang, Laichang Zhang
Research outputs 2014 to 2021
The densification behavior, microstructure and mechanical properties of bulk TiB2-based ceramic composites, fabricated using the spark plasma sintering (SPS) technique with elements of (Fe–Ni–Ti–Al) sinter-aid were investigated. Comparing the change of shrinkage displacement of pure TiB2 and TiB2–5 wt% (Fe–Ni–Ti–Al), the addition of elements Fe–Ni–Ti–Al into TiB2 can facilitate sintering of the TiB2 ceramics. As the sintering temperature exceeds 1300 °C, the relative density does not significantly change. Alumina particles and austenite (Fe–Ni–Ti) metallic binder distributed homogeneously in the grain boundary of TiB2 can inhibit the growth of the TiB2 grains when the sintering temperature is below 1300 °C. The …
Solar Energy Harvesting Clear Glass For Building-Integrated Photovoltaics, Kamal Alameh, Mikhail Vasiliev, Ramzy Alghamedi, Mohammad Alam, V. Rosenberg
Solar Energy Harvesting Clear Glass For Building-Integrated Photovoltaics, Kamal Alameh, Mikhail Vasiliev, Ramzy Alghamedi, Mohammad Alam, V. Rosenberg
Research outputs 2014 to 2021
We propose and demonstrate the concept of an energy-harvesting clear glass panel based on the use of all-inorganic luminophores embedded into a lamination layer in conjunction with low-emissivity coatings and CIS solar cells. Most of the visible solar radiation is transmitted through the laminated glass panel while UV radiation is down-converted and guided together with a part of infrared radiation to the edges for conversion to electricity by solar cells integrated at the edges of the glass panel. Experimental results demonstrate that a 10cmx10cm energy-harvesting clear glass can pass about 70% of the visible solar radiation, block 90% of UV …