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Full-Text Articles in Engineering

Influence Of Substrate Stage Temperature And Rotation Rate On The Magneto-Optical Quality Of Rf-Sputtered Bi2.1dy0.9fe3.9ga1.1o12 Garnet Thin Films, Mohammad E. Alam, Mikhail Vasiliev, Kamal Alameh Jan 2018

Influence Of Substrate Stage Temperature And Rotation Rate On The Magneto-Optical Quality Of Rf-Sputtered Bi2.1dy0.9fe3.9ga1.1o12 Garnet Thin Films, Mohammad E. Alam, Mikhail Vasiliev, Kamal Alameh

ECU Publications Post 2013

Highly bismuth-substituted iron garnet thin films are prepared on quartz substrates by using a radio frequency (RF) magnetron sputtering technique. We study the factors (process parameters associated with the RF magnetron sputter deposition technique) affecting the magneto-optical (MO) properties of ferrite garnet films of composition Bi2.1Dy0.9Fe3.9Ga1.1O12. All films show high MO response across the visible range of wavelengths after being annealed. In particular, the effects of substrate stage temperature and rotation rate on the various properties of films are studied. Experimental results reveal that the characteristics of garnet films of this type can be tuned and ...


Spectrally-Selective Energy-Harvesting Solar Windows For Public Infrastructure Applications, Mikhail Vasiliev, Kamal Alameh, Mohammad Alam Jan 2018

Spectrally-Selective Energy-Harvesting Solar Windows For Public Infrastructure Applications, Mikhail Vasiliev, Kamal Alameh, Mohammad Alam

ECU Publications Post 2013

A study of photovoltaic solar window technologies is reported and it focuses on their structural features, functional materials, system development, and suitability for use in practical field applications including public infrastructures and agricultural installations. Energy generation performance characteristics are summarized and compared to theory-limit predictions. Working examples of pilot-trial solar window-based installations are described. We also report on achieving electric power outputs of about 25 Wp/m2 from clear and transparent large-area glass-based solar windows.


Synthesis Of Magnetic Carbon Supported Manganese Catalysts For Phenol Oxidation By Activation Of Peroxymonosulfate, Yuxian Wang, Yongbing Xie, Chunmao Chen, Xiaoguang Duan, Hongqi Sun, Shaobin Wang Dec 2017

Synthesis Of Magnetic Carbon Supported Manganese Catalysts For Phenol Oxidation By Activation Of Peroxymonosulfate, Yuxian Wang, Yongbing Xie, Chunmao Chen, Xiaoguang Duan, Hongqi Sun, Shaobin Wang

ECU Publications Post 2013

Magnetic core/shell nanospheres (MCS) were synthesized by a novel and facile one-step hydrothermal method. Supported manganese oxide nanoparticles (Fe3O4/C/Mn) were obtained from various methods (including redox, hydrothermal and impregnation) using MCS as the support material and potassium permanganate as the precursor of manganese oxide. The Mn/MCS catalysts were characterized by a variety of characterization techniques and the catalytic performances of Fe3O4/C/Mn nanoparticles were tested in activation of peroxymonosulfate to produce reactive radicals for phenol degradation in aqueous solutions. It was found that Fe3O4/C/Mn ...


High-Performance Rf-Sputtered Bisubstituted Iron Garnet Thin Films With Almost In-Plane Magnetization, Mohammad Alam, Mikhail Vasiliev, Kamal Alameh Mar 2017

High-Performance Rf-Sputtered Bisubstituted Iron Garnet Thin Films With Almost In-Plane Magnetization, Mohammad Alam, Mikhail Vasiliev, Kamal Alameh

ECU Publications Post 2013

Bismuth-substituted iron garnet thin films of high quality are prepared by using RF magnetron sputtering technique in pure argon (Ar) plasma. All the developed garnet films show high magneto-optic (MO) response after being optimally annealed across the visible range wavelengths. The garnet films display almost in-plane magnetization component with adequate Faraday rotation and relatively low optical absorption over a wide spectral range of frequencies from visible to the infrared. These garnet-type thin films demonstrate excellent MO properties together with very low coercive field of about 30 Oe, and can be used in a wide range of magneto optical applications, especially ...


Determination Of Forming Ability Of High Pressure Die Casting For Zr-Based Metallic Glass, Lehua Liu, Jiang Ma, Chunyan Yu, Xiusong Huang, Liangju He, Laichang Zhang, Peijie Li, Zhiyuan Liu Jan 2017

Determination Of Forming Ability Of High Pressure Die Casting For Zr-Based Metallic Glass, Lehua Liu, Jiang Ma, Chunyan Yu, Xiusong Huang, Liangju He, Laichang Zhang, Peijie Li, Zhiyuan Liu

ECU Publications Post 2013

Large-sized industrial grade Zr55Cu30Ni5Al10 bulk metallic glass (BMG) was fabricated by a two-step arc-melting process and adding a trace of rare earth yttrium elements. A model to calculate critical cooling rate for forming BMG was established by considering the effect of pressure. Based on the model, the most important indicator, namely the critical size of forming BMG, for design and fabrication of BMG components by high pressure die casting (HPDC) is determined in consideration of different processing parameters, including the pressure and casting temperature. Theoretical calculation and numerical simulation indicated that increasing applied ...


Yig: Bi2o3 Nanocomposite Thin Films For Magnetooptic And Microwave Applications, M Nur-E-Alam, Mikhail Vasiliev, Kamal Alameh, Viacheslav Kotov, Victor Demidov, Dmitry Balabanov Jun 2015

Yig: Bi2o3 Nanocomposite Thin Films For Magnetooptic And Microwave Applications, M Nur-E-Alam, Mikhail Vasiliev, Kamal Alameh, Viacheslav Kotov, Victor Demidov, Dmitry Balabanov

ECU Publications Post 2013

Y3Fe5O12-Bi2O3 composite thin films are deposited onto Gd3Ga5O12 (GGG) substrates and their annealing crystallization regimes are optimized (in terms of both process temperatures and durations) to obtain high-quality thin film layers possessing magnetic properties attractive for a range of technological applications. The amount of bismuth oxide content introduced into these nanocomposite-type films is controlled by adjusting the RF power densities applied to both Y3Fe5O12 and Bi2O3 sputtering targets during the cosputtering deposition processes. The measured material properties of ...


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 Jan 2014

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

ECU Publications Post 2013

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 ...


Room-Temperature Spin-Polarized Organic Light-Emitting Diodes With A Single Ferromagnetic Electrode, Baofu Ding, Qunliang Song, Kamal Alameh Jan 2014

Room-Temperature Spin-Polarized Organic Light-Emitting Diodes With A Single Ferromagnetic Electrode, Baofu Ding, Qunliang Song, Kamal Alameh

ECU Publications Post 2013

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 ...