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2019

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Articles 9241 - 9270 of 11626

Full-Text Articles in Engineering

A Simple Technique For Development Of Fibres With Programmable Microsphere Concentration Gradients For Local Protein Delivery, Fahimeh Mehrpouya, Zhilian Yue, Anthony C. Romeo, Robert A. Gorkin Iii, Robert M. I Kapsa, Simon E. Moulton, Gordon G. Wallace Jan 2019

A Simple Technique For Development Of Fibres With Programmable Microsphere Concentration Gradients For Local Protein Delivery, Fahimeh Mehrpouya, Zhilian Yue, Anthony C. Romeo, Robert A. Gorkin Iii, Robert M. I Kapsa, Simon E. Moulton, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

Alginate has been a biologically viable option for controlled local delivery of bioactive molecules in vitro and in vivo. Specific bioactive molecule release profiles are achieved often by controlling polymer composition/concentration, which also determines the modulus of hydrogels. This largely limits alginate-mediated bioactive molecule delivery to single-factors of uniform concentration applications, rather than applications that may require (multiple) bioactive molecules delivered at a concentration gradient for chemotactic purposes. Here we report a two-phase PLGA/alginate delivery system composed of protein-laden poly-d,l-lactic-co-glycolic acid (PLGA) microspheres wet-spun into alginate fibres. Fluorescein isothiocyanate-conjugated bovine serum albumin (FITC-BSA) was used as a model protein and …

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Microporous Materials Formed Via Intercalation Of Ultrathin Coordination Polymers In A Layered Silicate, Yusuke Ide, Satoshi Tominaka, Taiki Okuyama, Nao Tsunoji, Koji Ohara, Masanori Mitome, Tsuneji Sano, Yoshio Bando, Dmitri Golberg Jan 2019

Microporous Materials Formed Via Intercalation Of Ultrathin Coordination Polymers In A Layered Silicate, Yusuke Ide, Satoshi Tominaka, Taiki Okuyama, Nao Tsunoji, Koji Ohara, Masanori Mitome, Tsuneji Sano, Yoshio Bando, Dmitri Golberg

Australian Institute for Innovative Materials - Papers

Development of microporous materials, like zeolites and metal-organic frameworks (MOFs), with unique and better properties, is crucially important, while yet challenging, for many energy applications. Herein, we report on a new family of microporous hybrids having well-defined permanent porosity, which is formed by pillaring a layered silicate with packed coordination polymers. This inorganic-organic hybrid material, having well-defined/two-faced micropores surrounded by the polymers and silicate walls, exhibits superior adsorption toward methanol due to co-operative interactions compared with conventional microporous materials. The material could be used as an adsorbent to selectively and effectively recover methanol from a methanol/water vapour mixture.

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Three-Dimensional Porous Cobalt Phosphide Nanocubes Encapsulated In A Graphene Aerogel As An Advanced Anode With High Coulombic Efficiency For High-Energy Lithium-Ion Batteries, Hong Gao, Fuhua Yang, Yang Zheng, Qing Zhang, Junnan Hao, Shilin Zhang, Hao Zheng, Jun Chen, Hua-Kun Liu, Zaiping Guo Jan 2019

Three-Dimensional Porous Cobalt Phosphide Nanocubes Encapsulated In A Graphene Aerogel As An Advanced Anode With High Coulombic Efficiency For High-Energy Lithium-Ion Batteries, Hong Gao, Fuhua Yang, Yang Zheng, Qing Zhang, Junnan Hao, Shilin Zhang, Hao Zheng, Jun Chen, Hua-Kun Liu, Zaiping Guo

Australian Institute for Innovative Materials - Papers

An ingeniously designed porous structure can synergistically optimize the desired properties and maximize the advantages of a material as an electrode for a high-performance energy storage system. The active material with a porous nanostructure could reduce the ion diffusion path and buffer the strain caused by the volume changes during cycling. Furthermore, combining the active material with a three-dimensional (3D) graphene aerogel (GA) matrix is an ideal way to maintain the structural integrity, improve the conductivity, and overcome the aggregation problem of the nanomaterials. Herein, we adopted a facile template-based strategy to derive a composite of 3D hierarchically porous cobalt …

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Hierarchically Stacked Reduced Graphene Oxide/Carbon Nanotubes For As High Performance Anode For Sodium-Ion Batteries, Jianmin Feng, Lei Dong, Xifei Li, Dejun Li, Pengyi Lu, Feng Hou, Ji Liang, Shi Xue Dou Jan 2019

Hierarchically Stacked Reduced Graphene Oxide/Carbon Nanotubes For As High Performance Anode For Sodium-Ion Batteries, Jianmin Feng, Lei Dong, Xifei Li, Dejun Li, Pengyi Lu, Feng Hou, Ji Liang, Shi Xue Dou

Australian Institute for Innovative Materials - Papers

Sodium has attracted an increasing amount of attention as an alternative element to lithium for energy storage due to its low cost and wide distribution, although the intercalation problem for sodium ions in conventional anode materials, due to their larger ionic size, still has to be overcome in order to utilize this element. Herein, we report a carbon-based hybrid material that is composed of stacked reduced graphene oxide/carbon nanotubes (rGO/CNTs) with a hierarchical and open structure to accommodate Na ions, which was fabricated by a liquid-phase oxidative exfoliation and subsequent reduction. This rGO/CNTs hybrid material features a hierarchical nanostructure with …

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A Hierarchical Porous Fe-N Impregnated Carbon-Graphene Hybrid For High-Performance Oxygen Reduction Reaction, Sihui Wang, Xiao Yan, Kuang-Hsu Wu, Xuemin Chen, Jianmin Feng, Pengyi Lu, Hou Feng, Hui-Ming Cheng, Ji Liang, Shi Xue Dou Jan 2019

A Hierarchical Porous Fe-N Impregnated Carbon-Graphene Hybrid For High-Performance Oxygen Reduction Reaction, Sihui Wang, Xiao Yan, Kuang-Hsu Wu, Xuemin Chen, Jianmin Feng, Pengyi Lu, Hou Feng, Hui-Ming Cheng, Ji Liang, Shi Xue Dou

Australian Institute for Innovative Materials - Papers

A Fe-N impregnated carbon in a hybrid with in-situ grown graphene from hierarchical porous carbon has been obtained for high-performance oxygen reduction reaction (ORR) catalysis. This hybrid material combines the desirable characteristics for the ORR, including Fe-N active sites, high surface area, good electron conductivity, and hierarchical channels for mass diffusion. As a result, this catalyst exhibits a very positive reaction onset potential ( 0.05 V vs. Ag/AgCl), a high ORR current density, and a complete four-electron ORR pathway, which are even better than a commercial 20% Pt/C catalyst. We further reveal the synergistic ORR enhancement from the controlled Fe-N …

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Oxygen Vacancies Promoting The Electrocatalytic Performance Of Ceo 2 Nanorods As Cathode Materials For Li-O 2 Batteries, Yue Hou, Jun Wang, Chuanxin Hou, Yuqi Fan, Yanjie Zhai, Hongyu Li, Feng Dang, Shulei Chou Jan 2019

Oxygen Vacancies Promoting The Electrocatalytic Performance Of Ceo 2 Nanorods As Cathode Materials For Li-O 2 Batteries, Yue Hou, Jun Wang, Chuanxin Hou, Yuqi Fan, Yanjie Zhai, Hongyu Li, Feng Dang, Shulei Chou

Australian Institute for Innovative Materials - Papers

Li-O 2 batteries have become very promising power sources for electronic vehicles as a result of their extraordinary energy density. Nevertheless, the unfavourable electrocatalytic activity of cathode materials in Li-O 2 batteries is still a limiting factor for the practical application of Li-O 2 batteries. This study proposes a surface engineering strategy which can enhance the electrocatalytic activity of CeO 2 nanorods by tuning the oxygen vacancies on their surface, and found that the highest concentration of oxygen vacancies induces the best electrochemical performance, including an extended electrochemical stability of 200 cycles, and reduces the overpotential of the ORR from …

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Nanosheets-In-Nanotube Co3o4-Carbon Array Design Enables Stable Li-Ion Storage, Dayi Guo, Lu Pan, Jianmin Hao, Limin Han, Ding Yi, Yajing Wang, Yijun Yang, Yoshio Bando, Xi Wang Jan 2019

Nanosheets-In-Nanotube Co3o4-Carbon Array Design Enables Stable Li-Ion Storage, Dayi Guo, Lu Pan, Jianmin Hao, Limin Han, Ding Yi, Yajing Wang, Yijun Yang, Yoshio Bando, Xi Wang

Australian Institute for Innovative Materials - Papers

Carbon composite products with different structures have been developed and used as anode for lithium-ion batteries due to the superior elasticity of carbon, which can keep the morphology integrity of the electrode materials in the process of the multiple cycles. Herein, a novel structure of nanosheets-in-nanotube Co 3 O 4 /carbon arrays is fabricated by the method of modified chemical vapor deposition (CVD). The carbon nanotube (CNT) layer acting as an outside coater can efficiently prevent the electrode from fragmentation and consequently ensure its shape integrity. The specific structure shows the ultra-stable cycle life (850 mAh g −1 after 200 …

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Molybdenum And Tungsten Chalcogenides For Lithium/Sodium-Ion Batteries: Beyond Mos2, Junda Huang, Zengxi Wei, Jiaqin Liao, Wei Ni, Caiyun Wang, Jianmin Ma Jan 2019

Molybdenum And Tungsten Chalcogenides For Lithium/Sodium-Ion Batteries: Beyond Mos2, Junda Huang, Zengxi Wei, Jiaqin Liao, Wei Ni, Caiyun Wang, Jianmin Ma

Australian Institute for Innovative Materials - Papers

Molybdenum and tungsten chalcogenides have attracted tremendous attention in energy storage and conversion due to their outstanding physicochemical and electrochemical properties. There are intensive studies on molybdenum and tungsten chalcogenides for energy storage and conversion, however, there is no systematic review on the applications of WS2, MoSe2and WSe2as anode materials for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs), except MoS2. Considering the importance of these contents, it is extremely necessary to overview the recent development of novel layered WS2, MoSe2and WSe2beyond MoS2in energy storage. Here, we will systematically overview the recent progress of WS2, MoSe2and WSe2as anode materials in LIBs …

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High-Performance Graphene-Fiber-Based Neural Recording Microelectrodes, Kezhong Wang, Christopher Frewin, Dorna Esrafilzadeh, Changchun Yu, Caiyun Wang, Joseph Pancrazio, Mario I. Romero-Ortega, Rouhollah Jalili, Gordon G. Wallace Jan 2019

High-Performance Graphene-Fiber-Based Neural Recording Microelectrodes, Kezhong Wang, Christopher Frewin, Dorna Esrafilzadeh, Changchun Yu, Caiyun Wang, Joseph Pancrazio, Mario I. Romero-Ortega, Rouhollah Jalili, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

Fabrication of flexible and free-standing graphene-fiber- (GF-) based microelectrode arrays with a thin platinum coating, acting as a current collector, results in a structure with low impedance, high surface area, and excellent electrochemical properties. This modification results in a strong synergistic effect between these two constituents leading to a robust and superior hybrid material with better performance than either graphene electrodes or Pt electrodes. The low impedance and porous structure of the GF results in an unrivalled charge injection capacity of 10.34 mC cm −2 with the ability to record and detect neuronal activity. Furthermore, the thin Pt layer transfers …

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An Efficient Multi-Doping Strategy To Enhance Li-Ion Conductivity In The Garnet-Type Solid Electrolyte Li7la3zr2o12, Yedukondalu Meesala, Yu-Kai Liao, Anirudha Jena, Nai-Hsuan Yang, Wei Kong Pang, Shu-Fen Hu, Ho Chang, Chia-Erh Liu, Shih-Chieh Liao, Jin-Ming Chen, Xiangxin Guo, Ru-Shi Liu Jan 2019

An Efficient Multi-Doping Strategy To Enhance Li-Ion Conductivity In The Garnet-Type Solid Electrolyte Li7la3zr2o12, Yedukondalu Meesala, Yu-Kai Liao, Anirudha Jena, Nai-Hsuan Yang, Wei Kong Pang, Shu-Fen Hu, Ho Chang, Chia-Erh Liu, Shih-Chieh Liao, Jin-Ming Chen, Xiangxin Guo, Ru-Shi Liu

Australian Institute for Innovative Materials - Papers

Lithium-ion (Li + ) batteries suffer from problems caused by the chemical instability of their organic electrolytes. Solid-state electrolytes that exhibit high ionic conductivities and are stable to lithium metal are potential replacements for flammable organic electrolytes. Garnet-type Li 7 La 3 Zr 2 O 12 is a promising solid-state electrolyte for next-generation solid-state Li batteries. In this study, we prepared mono-, dual-, and ternary-doped lithium (Li) garnets by doping tantalum (Ta), tantalum-barium (Ta-Ba), and tantalum-barium-gallium (Ta-Ba-Ga) ions, along with an undoped Li 7 La 3 Zr 2 O 12 (LLZO) cubic garnet electrolyte, using a conventional solid-state reaction method. …

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P2-Type Na2/3ni1/3mn2/3o2as A Cathode Materialwith High-Rate And Long-Life For Sodium Ionstorage, Qiannan Liu, Zhe Hu, Mingzhe Chen, Chao Zou, Huile Jin, Shun Wang, Qinfen Gu, Shulei Chou Jan 2019

P2-Type Na2/3ni1/3mn2/3o2as A Cathode Materialwith High-Rate And Long-Life For Sodium Ionstorage, Qiannan Liu, Zhe Hu, Mingzhe Chen, Chao Zou, Huile Jin, Shun Wang, Qinfen Gu, Shulei Chou

Australian Institute for Innovative Materials - Papers

Layered P2-type Na 2/3 Ni 1/3 Mn 2/3 O 2 was successfully synthesized through a facile sol-gel method and subsequent heat treatment. Resulting from different phase transformation and sodium ion diffusion rates, its electrochemical performance is highly related to the cut-off voltage and the electrolyte used. When the cut-off voltage is set up to 4.5 V or lowered to 1.5 V, capacity fade happens due to the occurrence of P2-O2 transformation and electrolyte decomposition or the redox reaction of the Mn 4+ /Mn 3+ ionic pair and P2-P2′ transformation. The electrode maintained 89.0 mA h g -1 with good cycling …

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Actuator Materials: Review On Recent Advances And Future Outlook For Smart Textiles, Dharshika Kongahage, Javad Foroughi Jan 2019

Actuator Materials: Review On Recent Advances And Future Outlook For Smart Textiles, Dharshika Kongahage, Javad Foroughi

Australian Institute for Innovative Materials - Papers

Smart textiles based on actuator materials are of practical interest, but few types have been commercially exploited. The challenge for researchers has been to bring the concept out of the laboratory by working out how to build these smart materials on an industrial scale and permanently incorporate them into textiles. Smart textiles are considered as the next frontline for electronics. Recent developments in advance technologies have led to the appearance of wearable electronics by fabricating, miniaturizing and embedding flexible conductive materials into textiles. The combination of textiles and smart materials have contributed to the development of new capabilities in fabrics …

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Structural Engineering Of Hierarchical Micro‐Nanostructured Ge-C Framework By Controlling The Nucleation For Ultralong Life Li Storage, Shilin Zhang, Yang Zheng, Xuejuan Huang, Jian Hong, Bin Cao, Junnan Hao, Qining Fan, Tengfei Zhou, Zaiping Guo Jan 2019

Structural Engineering Of Hierarchical Micro‐Nanostructured Ge-C Framework By Controlling The Nucleation For Ultralong Life Li Storage, Shilin Zhang, Yang Zheng, Xuejuan Huang, Jian Hong, Bin Cao, Junnan Hao, Qining Fan, Tengfei Zhou, Zaiping Guo

Australian Institute for Innovative Materials - Papers

The rational design of a proper electrode structure with high energy and power densities, long cycling lifespan, and low cost still remains a significant challenge for developing advanced energy storage systems. Germanium is a highly promising anode material for high-performance lithium ion batteries due to its large specific capacity and remarkable rate capability. Nevertheless, poor cycling stability and high price significantly limit its practical application. Herein, a facile and scalable structural engineering strategy is proposed by controlling the nucleation to fabricate a unique hierarchical micro-nanostructured Ge-C framework, featuring high tap density, reduced Ge content, superb structural stability, and a 3D …

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Emerging Approach In Semiconductor Photocatalysis: Towards 3d Architectures For Efficient Solar Fuels Generation In Semi-Artificial Photosynthetic Systems, Chong Yong Lee, Jinshuo Zou, John P. Bullock, Gordon G. Wallace Jan 2019

Emerging Approach In Semiconductor Photocatalysis: Towards 3d Architectures For Efficient Solar Fuels Generation In Semi-Artificial Photosynthetic Systems, Chong Yong Lee, Jinshuo Zou, John P. Bullock, Gordon G. Wallace

Australian Institute for Innovative Materials - Papers

Interest in the application of semiconductors toward the photocatalytic generation of solar fuels, including hydrogen from water-splitting and hydrocarbons from the reduction of carbon dioxide, remains strong due to concerns over the continued emission of greenhouse gases as well as other environmental impacts from the use of fossil fuels. While the efficiency and durability of such systems will depend heavily on the types of the semiconductors, co-catalysts, and mediators employed, the dimensionality of the semiconductors employed can also have a significant impact. Recognizing the broad nature of this field and the many recent advances in it, this review focuses on …

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Approaching High-Performance Potassium-Ion Batteries Via Advanced Design Strategies And Engineering, Wenchao Zhang, Yajie Liu, Zaiping Guo Jan 2019

Approaching High-Performance Potassium-Ion Batteries Via Advanced Design Strategies And Engineering, Wenchao Zhang, Yajie Liu, Zaiping Guo

Australian Institute for Innovative Materials - Papers

Potassium-ion batteries (PIBs) have attracted tremendous attention due to their low cost, fast ionic conductivity in electrolyte, and high operating voltage. Research on PIBs is still in its infancy, however, and achieving a general understanding of the drawbacks of each component and proposing research strategies for overcoming these problems are crucial for the exploration of suitable electrode materials/electrolytes and the establishment of electrode/ cell assembly technologies for further development of PIBs. In this review, we summarize our current understanding in this field, classify and highlight the design strategies for addressing the key issues in the research on PIBs, and propose …

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The Second Wind, Jacob Heiss, Logan Neidert Jan 2019

The Second Wind, Jacob Heiss, Logan Neidert

Williams Honors College, Honors Research Projects

The Second Wind device is a set of sensors and a data processing unit capable of recording data necessary to conduct a simplified version of a complex cardiopulmonary stress test (CPET). This data includes VO2, VCO2, ventilation, and pulse oximetry data. VO2 and VCO2 are the percent, by volume, of oxygen and carbon dioxide in the patient's breath, spirometry is the measure of air flow, and the pulse oximetry data includes heart rate (HR) and percent oxygen in the blood (SpO2). In addition, the device was designed to be portable, so this test could be run from patients’ homes or …

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Distance,Time And Terms In First Story Detection, Fei Wang Jan 2019

Distance,Time And Terms In First Story Detection, Fei Wang

Doctoral

First Story Detection (FSD) is an important application of online novelty detection within Natural Language Processing (NLP). Given a stream of documents, or stories, about news events in a chronological order, the goal of FSD is to identify the very first story for each event. While a variety of NLP techniques have been applied to the task, FSD remains challenging because it is still not clear what is the most crucial factor in defining the “story novelty”. Giventhesechallenges,thethesisaddressedinthisdissertationisthat the notion of novelty in FSD is multi-dimensional. To address this, the work presented has adopted a three dimensional analysis of the …

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Music Information Retrieval For Irish Traditional Music Automatic Analysis Of Harmonic, Rhythmic, And Melodic Features For Efficient Key-Invariant Tune Recognition, Pierre Beauguitte Jan 2019

Music Information Retrieval For Irish Traditional Music Automatic Analysis Of Harmonic, Rhythmic, And Melodic Features For Efficient Key-Invariant Tune Recognition, Pierre Beauguitte

Doctoral

Music making and listening practices increasingly rely on techno logy,and,asaconsequence,techniquesdevelopedinmusicinformation retrieval (MIR) research are more readily available to end users, in par ticular via online tools and smartphone apps. However, the majority of MIRresearchfocusesonWesternpopandclassicalmusic,andthusdoes not address specificities of other musical idioms. Irishtraditionalmusic(ITM)ispopularacrosstheglobe,withregular sessionsorganisedonallcontinents. ITMisadistinctivemusicalidiom, particularly in terms of heterophony and modality, and these character istics can constitute challenges for existing MIR algorithms. The bene fitsofdevelopingMIRmethodsspecificallytailoredtoITMisevidenced by Tunepal, a query-by-playing tool that has become popular among ITM practitioners since its release in 2009. As of today, Tunepal is the state of the art for tune recognition in ITM. The research in …

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Preliminary Examination Of The Effects Of Time And Flexural Direction On An Anisotropic Geosynthetic Cementitious Composite Mat, James M. Proctor Jan 2019

Preliminary Examination Of The Effects Of Time And Flexural Direction On An Anisotropic Geosynthetic Cementitious Composite Mat, James M. Proctor

Undergraduate Honors Theses

The significance of this research was to determine the effect the main fabric weave direction and cure time has on the maximum load of 0.34 inch anisotropic Geosynthetic Cementitious Composite Mat sample coupons. Two series of tests were run. The first used a three-point bend test on the material samples with varying cure times to determine the average maximum load associated with each. The second series of testing used followed ASTM D8030/D8030M - 16 for sample preparation and ASTM D8058 - 17 for testing to determine the flexural strength and modulus of elasticity of the test samples with and against …

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Inspire Newsletter Spring 2019, Missouri University Of Science And Technology. Inspire - University Transportation Center Jan 2019

Inspire Newsletter Spring 2019, Missouri University Of Science And Technology. Inspire - University Transportation Center

INSPIRE Newsletters

No abstract provided.

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Inspire Newsletter Fall 2019, Missouri University Of Science And Technology. Inspire - University Transportation Center Jan 2019

Inspire Newsletter Fall 2019, Missouri University Of Science And Technology. Inspire - University Transportation Center

INSPIRE Newsletters

No abstract provided.

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Supply Chain Infrastructure Restoration Calculator Software Tool -- Developer Guide And User Manual, Akhilesh Ojha, Bhanu Kanwar, Suzanna Long, Thomas G. Shoberg, Steven Corns Jan 2019

Supply Chain Infrastructure Restoration Calculator Software Tool -- Developer Guide And User Manual, Akhilesh Ojha, Bhanu Kanwar, Suzanna Long, Thomas G. Shoberg, Steven Corns

Engineering Management and Systems Engineering Faculty Research & Creative Works

This report describes a software tool that calculates costs associated with the reconstruction of supply chain interdependent critical infrastructure in the advent of a catastrophic failure by either outside forces (extreme events) or internal forces (fatigue). This tool fills a gap between search and recover strategies of the Federal Emergency Management Agency (or FEMA) and construction techniques under full recovery. In addition to overall construction costs, the tool calculates reconstruction needs in terms of personnel and their required support. From these estimates, total costs (or the cost of each element to be restored) can be calculated. Estimates are based upon …

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Sensorless Second-Order Switching Surface For A Three-Level Boost Converter, Tarek Messikh, Nasrudin Abd Rahim, Saad Mekhilef Jan 2019

Sensorless Second-Order Switching Surface For A Three-Level Boost Converter, Tarek Messikh, Nasrudin Abd Rahim, Saad Mekhilef

Turkish Journal of Electrical Engineering and Computer Sciences

This paper proposes a sensorless second-order switching surface to control a three-level boost converter (TLBC). A predictive current method is proposed to reduce the number of sensors in the normal second-order switching surface method. Based on a developed model of the TLBC, the current is estimated and a switching surface is formulated in the state-energy plane. Simulation and hardware tests are carried out to verify the viability and the effectiveness of the proposed control technique. Results obtained show a good performance of the converter in term of DC-bus balancing and fast dynamic response under sudden load change.

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Three-Channel Control Architecture For Multilateral Teleoperation Under Time Delay, Uğur Tümerdem Jan 2019

Three-Channel Control Architecture For Multilateral Teleoperation Under Time Delay, Uğur Tümerdem

Turkish Journal of Electrical Engineering and Computer Sciences

Multilateral teleoperation is an extension of bilateral/haptic teleoperation framework to multiple operators/robots and finds applications in haptic training. As in bilateral teleoperation, time delay is an important problem, and stability and transparency, which quantifies the performance of the teleoperation system, are critical in the design of multilateral control systems. This paper proposes a novel three-channel-based multilateral control architecture with damping injection to guarantee delay-independent L2 stability and high transparency in multilateral teleoperation systems. The theoretical and computational analyses are verified with experiment results.

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Contribution Of Artificial Proprioception On A Dynamic Finger Flexion Task, Mehdi Hojatmadani, Evren Samur Jan 2019

Contribution Of Artificial Proprioception On A Dynamic Finger Flexion Task, Mehdi Hojatmadani, Evren Samur

Turkish Journal of Electrical Engineering and Computer Sciences

There has been a considerable effort to provide sensory feedback for myoelectric prostheses. Among the solutions provided in the literature, sensory substitution is an easy and cost-effective way to provide feedback through different sensory modalities at different locations on the body. In this study, we evaluate the effect of sensory substitution of force and position feedback on a two-degree-of-freedom dynamic finger flexion task. For this purpose, a new methodology and an experimental setup are developed. The experimental methodology is based on the "strength-dexterity test", working on the principle of buckling of compression springs. The experimental setup comprises a haptic interface, …

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Optimized Modeling Of Ni-Mh Batteries Primarily Based On Taguchi Approach And Evaluation Of Used Ni-Mh Batteries, Hani Muhsen, Ahmad Al-Muhtady Jan 2019

Optimized Modeling Of Ni-Mh Batteries Primarily Based On Taguchi Approach And Evaluation Of Used Ni-Mh Batteries, Hani Muhsen, Ahmad Al-Muhtady

Turkish Journal of Electrical Engineering and Computer Sciences

This paper aims to generate an optimized model of the Ni-MH battery based on the Taguchi method and it further aims to evaluate used Ni-MH batteries that served in hybrid electric vehicles and electric vehicles. The status of twelve used Ni-MH batteries is studied to determine their usefulness after their life cycle in automotive applications. The status of used batteries is evaluated by investigating their state of charge, remaining useful life, and degradation in performance. Accordingly, the tested batteries are classified into four categories and they are proposed to serve in different applications. The novelty of the work lies in …

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Evaluation Of Power System Robustness In Order To Prevent Cascading Outages, Farnaaz Hajbani, Heresh Seyedi, Kazem Zare Jan 2019

Evaluation Of Power System Robustness In Order To Prevent Cascading Outages, Farnaaz Hajbani, Heresh Seyedi, Kazem Zare

Turkish Journal of Electrical Engineering and Computer Sciences

Power system robustness against overload condition is a challenging issue in the fields of power system planning and operation. In this paper, two indices are proposed to evaluate power system robustness. The proposed indices are used to identify critical lines whose failure is due to overload, leading the power system to cascading outages and blackout. The first proposed index is a linear index. The second index is based on graph theory metrics. To prevent cascading outages, system robustness is calculated for all N-1 and N-2 contingencies. The lines whose outages lead to the smallest robustness values are considered as critical …

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Improved Vsm Control Of Pmsg-Based Wind Farms For Transient Stability Enhancement, Mohamed Abbes, Ines Mehouachi, Souad Chebbi Jan 2019

Improved Vsm Control Of Pmsg-Based Wind Farms For Transient Stability Enhancement, Mohamed Abbes, Ines Mehouachi, Souad Chebbi

Turkish Journal of Electrical Engineering and Computer Sciences

This paper analyzes the optimal control strategy of PMSG-based wind farms during faults in order to improve the transient stability of a power system with a high penetration rate of wind power. The investigated control strategies are the unity power factor (UPF), reactive power control (RPC), and particularly the concept of virtual synchronous machine (VSM). The transient stability level is assessed using the critical clearing time index, which was calculated based on trajectory sensitivity analysis. In light of the obtained results, it was found that RPC gives the best transient stability level, followed by the classical VSM control. Hence, an …

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Determination Of Distance Between Dc Traction Power Centers In A 1500-V Dc Subway Line With Artificial Intelligence Methods, Mehmet Taci̇ddi̇n Akçay, İlhan Kocaarslan Jan 2019

Determination Of Distance Between Dc Traction Power Centers In A 1500-V Dc Subway Line With Artificial Intelligence Methods, Mehmet Taci̇ddi̇n Akçay, İlhan Kocaarslan

Turkish Journal of Electrical Engineering and Computer Sciences

The electrification system in rail systems is designed with regard to the operating data and design parameters. While the electrification system is formed, the minimum voltage rating that the traction force requires during the operation needs to be provided. The highest value of the voltage drop occurring on the line is determined by the distance between power centers. This value needs to be kept within certain limits for the continuity of operation. In this study, the determination of the distance between DC traction power centers for a 1500-V DC-fed rail system is done by means of the adaptive neuro-fuzzy inference …

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A Fuzzy Model Of Directional Relationships From The Phi-Descriptor, Mohammad Naeem, Nasir Ahmad, Sahib Khan, Asma Gul Jan 2019

A Fuzzy Model Of Directional Relationships From The Phi-Descriptor, Mohammad Naeem, Nasir Ahmad, Sahib Khan, Asma Gul

Turkish Journal of Electrical Engineering and Computer Sciences

Directional spatial relationships are a category of spatial relationships and have applications in the fields of image processing, geographic information systems, natural language processing, and robot navigation. They can be directly extracted from images or can be interpreted from a type of image descriptors called the relative position descriptors. Examples of relative position descriptors are the angle histogram, the force histogram, and the recently proposed phi-descriptor. So far, fuzzy models of directional spatial relationships from the angle histogram and force histograms have been proposed in the literature. These include the compatibility method, the aggregation method, and the method of effective …

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