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Articles 99751 - 99780 of 198069

Full-Text Articles in Engineering

An Adaptive Fuzzy Pi Controlled Bus Quantity Enhancer For Wave Energy Systems, Emre Özkop, Adel Sharaf, İsmai̇l Hakki Altaş Jan 2016

An Adaptive Fuzzy Pi Controlled Bus Quantity Enhancer For Wave Energy Systems, Emre Özkop, Adel Sharaf, İsmai̇l Hakki Altaş

Turkish Journal of Electrical Engineering and Computer Sciences

(AFPIC) for a flexible AC transmission system (FACTS)-based dynamic power filter (DPF) to be used in wave energy conversion systems. The new FACTS device stabilizes the DC-common bus voltage, reduces quality of power troubles, and enhances energy utilization by acting as a bus quantity enhancer (BQE). The design and realization of the proposed FACTS-based DPF and efficient control schemes are fully studied. To validate the efficiency of the proposed BQE FACTS device, a digital simulation model and a laboratory test system are developed in the MATLAB/Simulink/Simpower software environment for comparison. Various experimental test models of the proposed BQE system and …

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A New Wideband Electronically Tunable Grounded Resistor Employing Only Three Mos Transistors, Erkan Yuce, Sezai̇ Tokat, Firat Yücel Jan 2016

A New Wideband Electronically Tunable Grounded Resistor Employing Only Three Mos Transistors, Erkan Yuce, Sezai̇ Tokat, Firat Yücel

Turkish Journal of Electrical Engineering and Computer Sciences

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Fgmos-Based Differential Difference Cccii And Its Applications, Ökkeş Gökalp Sökmen, Sezai̇ Alper Teki̇n, Hamdi̇ Ercan, Mustafa Alçi Jan 2016

Fgmos-Based Differential Difference Cccii And Its Applications, Ökkeş Gökalp Sökmen, Sezai̇ Alper Teki̇n, Hamdi̇ Ercan, Mustafa Alçi

Turkish Journal of Electrical Engineering and Computer Sciences

controlled current conveyor (DDCCC) is proposed in this paper. Major advantages of the FGMOS-based DDCCC are low power dissipation and simplicity. The proposed circuit is designed using only 14 MOS transistors. The total power dissipation of the proposed circuit is equal to 7.38 $\mu $W. The other advantage of this circuit is that intrinsic resistance seen at port X of the DDCCC can easily be tuned by a biasing current. The tuning range of the intrinsic resistance is rather wide. Additionally, a current controlled universal filter and tunable positive and negative active resistors are presented as applications of the proposed …

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A New Abc-Based Multiobjective Optimization Algorithm With An Improvement Approach (Ibmo: Improved Bee Colony Algorithm For Multiobjective Optimization), Tahi̇r Sağ, Mehmet Çunkaş Jan 2016

A New Abc-Based Multiobjective Optimization Algorithm With An Improvement Approach (Ibmo: Improved Bee Colony Algorithm For Multiobjective Optimization), Tahi̇r Sağ, Mehmet Çunkaş

Turkish Journal of Electrical Engineering and Computer Sciences

No abstract provided.

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Content-Based Texture Image Retrieval By Histogram Of Curvelets, Erkan Uslu, Songül Albayrak Jan 2016

Content-Based Texture Image Retrieval By Histogram Of Curvelets, Erkan Uslu, Songül Albayrak

Turkish Journal of Electrical Engineering and Computer Sciences

No abstract provided.

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Shunt Active Power Filter Control For Compensating Current Power Quality Problems In Three-Phase Three-Wire Systems Based On An Adaptive Notch Filter, Seyed Hossein Tabatabaei, Mehran Moslehi Bajestan, Alireza Jalilian Jan 2016

Shunt Active Power Filter Control For Compensating Current Power Quality Problems In Three-Phase Three-Wire Systems Based On An Adaptive Notch Filter, Seyed Hossein Tabatabaei, Mehran Moslehi Bajestan, Alireza Jalilian

Turkish Journal of Electrical Engineering and Computer Sciences

No abstract provided.

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Impact Of Statcom And Sssc On Synchronous Generator Loe Protection, Amir Ghorbani, Babak Mozafari, Soodabeh Soleymani, Ali Mohammad Ranjbar Jan 2016

Impact Of Statcom And Sssc On Synchronous Generator Loe Protection, Amir Ghorbani, Babak Mozafari, Soodabeh Soleymani, Ali Mohammad Ranjbar

Turkish Journal of Electrical Engineering and Computer Sciences

of synchronous generators. Nowadays, application of an impedance relay with two negative offset operation zones to protect LOE is prevalent; this relay measures the output voltage and current of generator to detect LOE. On the other hand, utilization of flexible AC transmission systems (FACTS) devices in power systems for different applications is soaring; these devices cause changes in voltage and current signals in the utilized power system. Therefore, this paper is dedicated to investigate the amounts of changes in the current and voltage signals measured by the LOE relay when the static synchronous compensator (STATCOM) and static synchronous series compensator …

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Design Of Fir Filters Using Exponential--Hamming Window Family, Kemal Avci̇ Jan 2016

Design Of Fir Filters Using Exponential--Hamming Window Family, Kemal Avci̇

Turkish Journal of Electrical Engineering and Computer Sciences

No abstract provided.

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Design And Manufacture Of Tds Measurement And Control System For Water Purification In Reverse Osmosis By Pid Fuzzy Logic Controller With The Ability To Compensate Effects Of Temperature On Measurement, Seyed Kamaleddin Mousavi Mashhadi, Hamid Yadollahi, Abbas Marvian Mashhad Jan 2016

Design And Manufacture Of Tds Measurement And Control System For Water Purification In Reverse Osmosis By Pid Fuzzy Logic Controller With The Ability To Compensate Effects Of Temperature On Measurement, Seyed Kamaleddin Mousavi Mashhadi, Hamid Yadollahi, Abbas Marvian Mashhad

Turkish Journal of Electrical Engineering and Computer Sciences

of water has significant importance for industry, agriculture, livestock, and health. The system designed and manufactured in this paper measures, displays, and controls the TDS of water by installation on domestic and industrial purification systems. Technology of manufacturing the TDS measurement system is such that it can compensate for the adverse effect of temperature. Calibration of the measurement system will be explained here by discussion of several examinations conducted at the Research Institute of Food Science and Technology of Iran. In order to control TDS, a mathematical model for domestic water purification devices of reverse osmosis (RO) is obtained using …

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Abnormal Event Detection In Crowded Scenes Via Bag-Of-Atomic-Events-Based Topic Model, Xing Hu, Shiqiang Hu, Lingkun Luo, Guoxiang Li Jan 2016

Abnormal Event Detection In Crowded Scenes Via Bag-Of-Atomic-Events-Based Topic Model, Xing Hu, Shiqiang Hu, Lingkun Luo, Guoxiang Li

Turkish Journal of Electrical Engineering and Computer Sciences

crowded scenes. A new concept of atomic event is introduced into this framework, which is the basic component of video events. Different from previous bag-of-words (BoW) modeling-based methods that represent feature descriptors using only one code word, a feature descriptor is represented using a few more atomic events in bag-of-atomic-events (BoAE) modeling. Consequently, the approximation error is reduced by using the obtained BoAE representation. In the context of abnormal event detection, BoAE representation is more suitable to describe abnormal events than BoW representation, because the abnormal event may not correspond to any code word in BoW modeling. Fast latent Dirichlet …

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Effects Of Mica2-Based Discrete Energy Levels On The Lifetime Of Cooperation Neighbor Sensor Networks, Zeydi̇n Pala Jan 2016

Effects Of Mica2-Based Discrete Energy Levels On The Lifetime Of Cooperation Neighbor Sensor Networks, Zeydi̇n Pala

Turkish Journal of Electrical Engineering and Computer Sciences

using Mica2 mote discrete power levels on neighbor sensor network lifetime. We built a linear programming framework to qualify the cooperation of sensor networks using a discrete energy model in comparison to noncooperating networks. Our results showed that a wireless sensor neighbor network that uses a discrete radio model can be more energy efficient than a network that uses a nondiscrete energy model.

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Dynamic Characteristics Of An Isolated Self-Excited Synchronous Reluctance Generator Driven By A Wind Turbine, Mosaad Mohiedden Ali, Said Mahmoud Allam, Talaat Hamdan Abdel-Moneim Jan 2016

Dynamic Characteristics Of An Isolated Self-Excited Synchronous Reluctance Generator Driven By A Wind Turbine, Mosaad Mohiedden Ali, Said Mahmoud Allam, Talaat Hamdan Abdel-Moneim

Turkish Journal of Electrical Engineering and Computer Sciences

This paper studies the dynamic characteristics of an isolated three-phase self-excited synchronous reluctance generator (SESRG) driven by a variable-speed wind turbine under different operating conditions. Self-excitation is achieved via capacitors connected across the generator terminals. A detailed mathematical modeling of the proposed self-excited wind generation system is presented. The proposed analysis is based on the dynamic qd-axis model of the SESRG. Magnetic saturation is taken into account and is assumed to be confined to the direct axis and is accounted for as a variable direct-axis magnetizing reactance. Effect of wind-speed variation, excitation-capacitance variation, and loading-conditions variation on the generated output …

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Influence Of Neural Network Training Parameters On Short-Term Wind Forecasting, Adel Brka, Yasir M. Al-Abdeli, Ganesh Kothapalli Jan 2016

Influence Of Neural Network Training Parameters On Short-Term Wind Forecasting, Adel Brka, Yasir M. Al-Abdeli, Ganesh Kothapalli

Research outputs 2014 to 2021

This paper investigates factors which can affect the accuracy of short-term wind speed prediction when done over long periods spanning different seasons. Two types of neural networks (NNs) are used to forecast power generated via specific horizontal axis wind turbines. Meteorological data used are for a specific Western Australian location. Results reveal that seasonal variations affect the prediction accuracy of the wind resource, but the magnitude of this influence strongly depends on the details of the NN deployed. Factors investigated include the span of the time series needed to initially train the networks, the temporal resolution of these data, the …

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Equiaxed Ti-Based Composites With High Strength And Large Plasticity Prepared By Sintering And Crystallizing Amorphous Powder, Lehua Liu, Chao Yang, L. M. Kang, Yan Long, Zhiyu Xiao, Peijie Li, Laichang Zhang Jan 2016

Equiaxed Ti-Based Composites With High Strength And Large Plasticity Prepared By Sintering And Crystallizing Amorphous Powder, Lehua Liu, Chao Yang, L. M. Kang, Yan Long, Zhiyu Xiao, Peijie Li, Laichang Zhang

Research outputs 2014 to 2021

High-performance titanium alloys with an equiaxed composite microstructure were achieved by sintering and crystallizing amorphous powder. By introducing a second phase in a β-Ti matrix, series of optimized Ti-Nb-Fe-Co-Al and Ti-Nb-Cu-Ni-Al composites, which have a microstructure composed of ultrafine-grained and equiaxed CoTi2 or (Cu,Ni)Ti2 precipitated phases surrounded by a ductile β-Ti matrix, were fabricated by sintering and crystallizing mechanically alloyed amorphous powder. The as-fabricated composites exhibit ultra-high ultimate compressive strength of 2585MPa and extremely large compressive plastic strain of around 40%, which are greater than the corresponding ones for most titanium alloys. In contrast, the alloy fabricated by …

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Technical Feasibility Analysis Of Utilizing Special Purpose Machine Tools, Ana Vafadar, Majid Tolouei Rad, Kevin Hayward, Kazem Abhary Jan 2016

Technical Feasibility Analysis Of Utilizing Special Purpose Machine Tools, Ana Vafadar, Majid Tolouei Rad, Kevin Hayward, Kazem Abhary

Research outputs 2014 to 2021

Special purpose machine tools (SPMs) are primarily used for performing drilling-related operations and are widely used in mass production including automotive component manufacturing. Utilization of SPM is considerably widespread; however, this technology is relatively new and expensive. The important problems facing manufacturing industries wishing to utilize this technology is feasibility analysis to decide whether a SPM can be utilised for production of the given part and if it is feasible which SPM components would be appropriate. Since the cost of utilizing SPM is high, feasibility analysis must be performed before any investment on detailed design. This paper proposes a technical …

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A Rapid Co-Culture Stamping Device For Studying Intercellular Communication, Amin Hassanzadeh-Barforoushi, Jonathan Shemesh, Nona Farbehi, Mohsen Asadnia, Guan H. Yeoh, Richard P. Harvey, Robert E. Nordon, Majid E. Warkiani Jan 2016

A Rapid Co-Culture Stamping Device For Studying Intercellular Communication, Amin Hassanzadeh-Barforoushi, Jonathan Shemesh, Nona Farbehi, Mohsen Asadnia, Guan H. Yeoh, Richard P. Harvey, Robert E. Nordon, Majid E. Warkiani

Research outputs 2014 to 2021

Regulation of tissue development and repair depends on communication between neighbouring cells. Recent advances in cell micro-contact printing and microfluidics have facilitated the in-vitro study of homotypic and heterotypic cell-cell interaction. Nonetheless, these techniques are still complicated to perform and as a result, are seldom used by biologists. We report here development of a temporarily sealed microfluidic stamping device which utilizes a novel valve design for patterning two adherent cell lines with well-defined interlacing configurations to study cell-cell interactions. We demonstrate post-stamping cell viability of > 95%, the stamping of multiple adherent cell types, and the ability to control the seeded …

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Techno-Economic Evaluation Of Solar Irrigation Plants Installed In Bangladesh, Najmul Hoque, Amit Roy, Mohd. Rafiqul A. Beg, B. K. Das Jan 2016

Techno-Economic Evaluation Of Solar Irrigation Plants Installed In Bangladesh, Najmul Hoque, Amit Roy, Mohd. Rafiqul A. Beg, B. K. Das

Research outputs 2014 to 2021

In the summer season, irrigation sector in Bangladesh suffers a lot due to the country wide electricity crisis. Solar pump offers a clean and simple alternative to the conventional fuel fired engine or grid electricity driven pump in this regard to resolve the issue. In this paper, the techno-economic analyses of solar irrigation plants installed in Bangladesh are evaluated. It was observed that systems were running around 70% to 80% of the rated power which was quite acceptable. A 10 hp pump was able to pump 600 liter of water per minute which was also satisfactory to irrigate the land. …

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New Cost Model For Feasibility Analysis Of Utilising Special Purpose Machine Tools, Ana Vafadar, Majid Tolouei-Rad, Kevin Haywood Jan 2016

New Cost Model For Feasibility Analysis Of Utilising Special Purpose Machine Tools, Ana Vafadar, Majid Tolouei-Rad, Kevin Haywood

Research outputs 2014 to 2021

Special purpose machine tools (SPMs) have been widely used to perform drilling-related operations in high volume production including within automotive component industries. The first step in designing and manufacturing a SPM is a feasibility analysis. Since SPMs have relatively higher investment cost than other machine tools, this task must be performed before any investment on the preparation of detailed design. The present paper explores an economic feasibility analysis strategy which aims to make logical decision by assessing the strengths and limitations of an SPM in comparison with other machine tools. The mathematical product cost model for SPMs is proposed for …

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Preparation Of Biomass Derived Porous Carbon: Application For Methane Energy Storage, Yong Sun, Guangzhi Sun Jan 2016

Preparation Of Biomass Derived Porous Carbon: Application For Methane Energy Storage, Yong Sun, Guangzhi Sun

Research outputs 2014 to 2021

The porous carbon with high specific surface area of 3001 m2/g and pore volume of 1.59 cm3/g using corncob was prepared for methane storage. The low and high pressure adsorption equilibria were tested using the prepared carbon. The capacity of methane storage is evaluated using Tóth model with correction of fugacity using Benedict-Webb-Rubin equation of state in high pressure range. The theoretical maximum adsorption amount is achieved to be approximately 3.3 mmol/g. The adsorption process indicates physisorption dominates the adsorption with heterogeneous adsorption characteristic of sites on the surface of adsorbent at low pressure. The resultant carbon is ideal adsorbent …

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Corn Stover Biochar In Gypsum Board: Empirical Analysis Of Thermal Conductivity And Flexural Strength, Albena Yordanova Jan 2016

Corn Stover Biochar In Gypsum Board: Empirical Analysis Of Thermal Conductivity And Flexural Strength, Albena Yordanova

Dissertations and Theses @ UNI

Gypsum board, an economical and durable finish material for wall and ceiling construction in the United States and worldwide, is the component with the lowest thermal performance in a typical exterior wall assembly. It also constitutes a substantial portion of construction waste in landfills, potentially creating harmful environmental effects and dangerous gases. To minimize the negative effects of fast growing construction waste of gypsum in landfills and meet higher standards for energy efficiency in construction, there is a need to explore sustainable ways of improving thermal properties of gypsum board and recycling the material. Gypsum can be recycled and used …

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Machine Learning Through Mimicry And Association, Nickolas S. Holcomb Jan 2016

Machine Learning Through Mimicry And Association, Nickolas S. Holcomb

Honors College Theses

Adaptability is a key missing features that has impeded the growth of assistive robotics. In the traditional model, all actions must be explicitly coded by a skilled programmer familiar with the hardware. This project explores a method of teaching a webcam equipped arm type robot new primitive movement using visual demonstrations.

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Biolabeling Through The Use Of Water-Soluble Colloidal Quantum Dots, Cody Stombaugh Jan 2016

Biolabeling Through The Use Of Water-Soluble Colloidal Quantum Dots, Cody Stombaugh

Honors Projects

Nanomaterials continues to be a growing field of study due to their wide range of potential applications. Quantum dots are artificially synthesized crystalline clusters of atoms able to confine electron motion as a result of their incredibly small size. Recently, medical applications of nanomaterials have expanded greatly. Quantum dots are ideal for biolabeling due to their rather narrow photoluminescence emission peaks. By synthesizing quantum dots of a specific diameter, it is possible to predetermine the peak photoluminescence wavelength of a sample. Through ligand exchange and immunoconjugation of the quantum dots with proteins, it is possible to use the quantum dots …

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Parameterized Vertical-Axis Wind Turbine Wake Model Using Cfd Vorticity Data, Andrew Ning, Eric Tingey Jan 2016

Parameterized Vertical-Axis Wind Turbine Wake Model Using Cfd Vorticity Data, Andrew Ning, Eric Tingey

Faculty Publications

In order to analyze or optimize a wind farm layout, reduced-order wake models are often used to estimate the interactions between turbines. While many such models exist for horizontal-axis wind turbines, for vertical-axis wind turbines (VAWTs) a simple parametric wake model does not exist. Using computational fluid dynamic (CFD) simulations we computed vorticity in a VAWT wake, and parameterized the data based on normalized downstream positions, tip-speed ratio, and solidity to predict a normalized wake velocity deficit. When compared to CFD, which takes about a day to run one simulation, the reduced-order model predicts the velocity deficit at any location …

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Facilitating Deployable Mechanisms And Structures Via Developable Lamina Emergent Arrays, Larry L. Howell, Robert J. Lang, Spencer P. Magleby, Todd G. Nelson, Nathan A. Pherson Jan 2016

Facilitating Deployable Mechanisms And Structures Via Developable Lamina Emergent Arrays, Larry L. Howell, Robert J. Lang, Spencer P. Magleby, Todd G. Nelson, Nathan A. Pherson

Faculty Publications

A method is presented utilizing networks of lamina emergent joints, known as lamina emergent arrays, to accommodate large-curvature developable structures suited to deployable applications. By exploiting the ruling lines in developable surfaces, this method enables developable structures and mechanisms that can be manufactured with two-dimensional geometry and yet have a greater range of elastic motion than is possible with a solid sheet of material. Aligning the joints to the ruling lines also biases the structure to a specific deployment path. A mathematical model is developed to describe the resulting stiffness of the structure employing the lamina emergent arrays and equations …

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The Heat Treatment Analysis Of E110 Case Hardening Steel, Majid Tolouei Rad, Eric Lichter Jan 2016

The Heat Treatment Analysis Of E110 Case Hardening Steel, Majid Tolouei Rad, Eric Lichter

Research outputs 2014 to 2021

This paper investigates mechanical and microstructural behaviour of E110 case hardening steel when subjected to different heat treatment processes includingquenching, normalizing and tempering. After heat treatment samples were subjected to mechanical and metallographic analysisand the properties obtained from applying different processes were analysed. The heat treatment process had certain effects on the resultant properties andmicrostructures obtained for E110 steel which are described in details. Quenching produced a martensitic microstructure characterized by significant increase in material’s hardness and a significant decreased in its impact energy. Annealed specimens produced a coarse pearlitic microstructure with minimal variation in hardness and impact energy. For …

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Optical Fiber Sensors In Physical Intrusion Detection Systems: A Review, Gary Andrew Allwood, Graham Wild, Steven Hinkley Jan 2016

Optical Fiber Sensors In Physical Intrusion Detection Systems: A Review, Gary Andrew Allwood, Graham Wild, Steven Hinkley

Research outputs 2014 to 2021

Fiber optic sensors have become a mainstream sensing technology within a large array of applications due to their inherent benefits. They are now used significantly in structural health monitoring, and are an essential solution for monitoring harsh environments. Since their first development over 30 years ago, they have also found promise in security applications. This paper reviews all of the optical fiber-based techniques used in physical intrusion detection systems. It details the different approaches used for sensing, interrogation, and networking, by research groups, attempting to secure both commercial and residential premises from physical security breaches. The advantages and the disadvantages …

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Proactive Biometric-Enabled Forensic Imprinting, Abdulrahman Alruban, Nathan L. Clarke, Fudong Li, Steven M. Furnell Jan 2016

Proactive Biometric-Enabled Forensic Imprinting, Abdulrahman Alruban, Nathan L. Clarke, Fudong Li, Steven M. Furnell

Research outputs 2014 to 2021

Threats to enterprises have become widespread in the last decade. A major source of such threats originates from insiders who have legitimate access to the organization's internal systems and databases. Therefore, preventing or responding to such incidents has become a challenging task. Digital forensics has grown into a de-facto standard in the examination of electronic evidence; however, a key barrier is often being able to associate an individual to the stolen data. Stolen credentials and the Trojan defense are two commonly cited arguments used. This paper proposes a model that can more inextricably links the use of information (e.g. images, …

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A Practical Anodic And Cathodic Curve Intersection Model To Understand Multiple Corrosion Potentials Of Fe-Based Glassy Alloys In Oh-Contained Solutions, Yingjie Li, Yonggang Wang, Bang An, Hui Xu, Yihua Liu, Laichang Zhang, Houyi Ma, Weimin Wang Jan 2016

A Practical Anodic And Cathodic Curve Intersection Model To Understand Multiple Corrosion Potentials Of Fe-Based Glassy Alloys In Oh-Contained Solutions, Yingjie Li, Yonggang Wang, Bang An, Hui Xu, Yihua Liu, Laichang Zhang, Houyi Ma, Weimin Wang

Research outputs 2014 to 2021

A practical anodic and cathodic curve intersection model, which consisted of an apparent anodic curve and an imaginary cathodic line, was proposed to explain multiple corrosion potentials occurred in potentiodynamic polarization curves of Fe-based glassy alloys in alkaline solution. The apparent anodic curve was selected from the measured anodic curves. The imaginary cathodic line was obtained by linearly fitting the differences of anodic curves and can be moved evenly or rotated to predict the number and value of corrosion potentials. © 2016 Li et al. This is an open access article distributed under the terms of the Creative Commons Attribution …

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Global Sensitivity Analysis For A Comprehensive Char Conversion Model In Oxy-Fuel Conditions, Troy Michael Holland, Thomas H. Fletcher Jan 2016

Global Sensitivity Analysis For A Comprehensive Char Conversion Model In Oxy-Fuel Conditions, Troy Michael Holland, Thomas H. Fletcher

Faculty Publications

Oxy-fired coal combustion is a promising potential carbon capture technology. Predictive CFD simulations are valuable tools in evaluating and deploying oxy-fuel and other carbon capture technologies either as retrofit technologies or for new construction. However, accurate predictive simulations require physically realistic submodels with low computational requirements. In particular, comprehensive char oxidation and gasification models have been developed that describe multiple reaction and diffusion processes. This work focuses on the sensitivity of a recent comprehensive char conversion code named CCK, which treats surface oxidation and gasification reactions as well as the processes such as film diffusion, pore diffusion, ash encapsulation, and …

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Novel H.265 Video Traffic Prediction Models Using Artificial Neural Networks, Collin Daly Jan 2016

Novel H.265 Video Traffic Prediction Models Using Artificial Neural Networks, Collin Daly

Honors College Theses

In this work, we propose the use of non-linear, autoregressive neural network models for predicting video frame sizes. This model utilizes H.265 encoded video traces as inputs and the predicted future frame sizes as outputs. This model is developed to predict ultra-high definition video frame encoded with H.265 within IP networks. The video I, P, and B frames are predicted separately to improve model prediction accuracy. This approach is verified in MATLAB using various H.265 video traces. The results indicate that the proposed models were able to predict the video traffic fairly accurately.

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