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Aging Affects Postural Tracking Of Complex Visual Motion Cues, Haralampos Sotirakis, Anastasia Kyvelidou, L. Mademli, Nicholas Stergiou, Vassilia Hatzitaki

Journal Articles

Postural tracking of visual motion cues improves perception–action coupling in aging, yet the nature of the visual cues to be tracked is critical for the efficacy of such a paradigm. We investigated how well healthy older (72.45 ± 4.72 years) and young (22.98 ± 2.9 years) adults can follow with their gaze and posture horizontally moving visual target cues of different degree of complexity. Participants tracked continuously for 120 s the motion of a visual target (dot) that oscillated in three different patterns: a simple periodic (simulated by a sine), a more complex (simulated by the Lorenz attractor that is …

Special Issue: Electrocatalyst And Electrocatalysis In Fuel Cells Preface, Zi-Dong Wei

Journal of Electrochemistry

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Recent Progress In Non-Precious Metal Oxygen Reduction Reaction Catalysts With An Encapsulation Structure, Mei-Ling Xiao, Jian-Bing Zhu, Chang-Peng Liu, Jun-Jie Ge, Wei Xing

Journal of Electrochemistry

Platinum-based materials, the state-of-the-art catalysts for fuel cells, suffer from prohibitive costs, limited resources and insufficient durability. Accordingly, tremendous efforts were made in searching for efficient, durable and inexpensive alternatives to precious-metal electrocatalysts for the oxygen reduction reaction (ORR). Transition-metals (Fe, Co)/nitrogen co-doped hybrids, heteroatom (N, P, S, F, et al) doped carbons and composites with transition-metals encapsulated in graphitic layers are reported as the most efficient non-precious metal ORR catalysts. Among the various non-precious metal ORR catalysts, transition-metals encased in graphitic layer catalysts are a novel type of catalysts for ORR with high activity and durability, and thus, the …

Dynamic Simulation Of Oxygen Reduction Reaction In Pt/C Electrode For Proton Exchange Membrane Fuel Cells, Shang Li, Fen Zhou, Lei Chen, Mu Pan

Journal of Electrochemistry

It is an urgent need to reduce the Pt loading in electrode for practical fuel cell applications worldwide. Herein, we theoretically investigate the oxygen distribution, generated current, and minimum Pt loading of Pt/C electrode for practical applications based on kinetic model of oxygen reduction reaction. The results indicate that with increasing electrode effective thickness to 40 mm, serious concentration polarization is expected for Pt/C electrode. To generate a power density of 1.4 W⋅cm^-2 (2.1A⋅cm^-2@0.67 V) for fuel cell, the cathode catalyst layer thickness in PEMFC should be as thin as 3 mm. The minimum Pt loading will …

Multi-Scaled Carbon Supported Platinum As A Stable Electrocatalyst For Oxygen Reduction Reaction, Yu-Ping Li, Lu-Hua Jiang, Su-Li Wang, Gong-Quan Sun

Journal of Electrochemistry

The stability of carbon supports is essential for electrocatalysts of fuel cells. Herein, the mesoporous carbon with the high graphitic degree (highly graphitic mesoporous carbon, HGMC) was synthesized by using resorcinol as the carbon precursor, SiO₂ as the templates and urea as the reducing agent. The as-prepared HGMC was characterized by XRD, Raman spectroscopy, TEM, N2 adsorption. The stability of HGMC was evaluated by mimicking the start-up/shut-down conditions of fuel cells in a three-electrode system referring to the NREL standard. The obtained HGMC is of moderate surface area (187.4 m²•g^-1) and is chemically stable under …

Recycling Mf Solid Waste Into Mesoporous Nitrogen-Doped Carbon With Iron Carbide Complex In Graphitic Layers As An Efficient Catalyst For Oxygen Reduction Reaction, Can-Yun Zhao, Lin Huang, Yong You, Ying-Fang Yao, Xiao-Gang Su, Hong Wan, Jian-Guo Liu, Cong-Ping Wu

Journal of Electrochemistry

Nitrogen-doped carbon materials with iron ions are known as catalytic growth agents for the oxygen reduction reaction (ORR) in fuel cells, but the design and synthesis of high-performance and low-cost catalysts still remain a significant challenge. Herein, we present a cost-effective approach to dispose of MF solid waste as the precursor for the synthesis of MCFes catalyst with the favorable structure features such as the high specific surface area, abundant active sites and suitable pore structure. The results showed that the MCFe-10/10/2 had specific surface area as high as 780.7 m²•g^-1 and high efficient catalytic activity comparable …

Recent Progresses In Molybdenum-Based Electrocatalysts For The Hydrogen Evolution Reaction, Ze-Xing Wu, Jie Wang, Jun-Po Guo, Jing Zhu, De-Li Wang

Journal of Electrochemistry

Electrochemical catalytic production of hydrogen has been considered as a promising and sustainable strategy for clean and renewable energy technologies. Molybdenum-based non noble metal catalysts for the hydrogen evolution reaction have attracted extensive attention due to its effective catalytic performance. In this review, the recent progresses in molybdenum-carbide, phosphide, nitride and sulfide electrocatalysts are presented. In addition, the strategies to improve the catalytic performance are analyzed and the prospects for the future development trends are expected.

Rambling Between "Zhong Yong" And "Catalysis", Zi-Dong Wei

Journal of Electrochemistry

“Zhong Yong” represents a traditional Chinese wisdom, which was first proposed by Confucius and continuously richened by his followers. “Zhong Yong” pursues the balances among all kinds of contradictions, and insists that neither “too much” nor “not enough” is good. For a successful catalyst, on which the adsorption of reactants must be not so strong and not so weak either. On this point of view, there are the same pursuits for “Zhong Yong” and catalysis. In this paper, the author starts his story with a conversation between Confucius and his student, followed by 3 interesting stories happening in the ancient …

Musings On Inspiration: Inducing Inspiration And Increasing Donations To Charity, Rebekah Selbrede

Departmental Honors & Graduate Capstone Projects

This study examined different methods for inducing inspiration, sex differences in inspiration induction, and whether inducing inspiration would increase donations to charity. We found that men and women responded differently to various methods of inducing inspiration. Women were most inspired by the video and reflection groups, while men's inspiration did not differ by induction method. For women, but not men, inspiration mediated the relationship between induction method and amount of donation pledged indicating that their willingness to donate to charity increased as they felt more inspired. Despite differences in inspiration, men and women did not differ in amount donated, which …

Integrating Twitter Into The Classroom, Toria Felton

Master of Education in Instructional Design and Technology Plan II Graduate Projects

The purpose of this project was to research, create, and implement lesson plans that utilized Twitter in the classroom. This project was also used to gauge how students felt about using social media in the classroom. It showed professors how to effectively and easily use the app in the classroom, which helped them to connect with more students and work on a platform that was of interest to many of the students.

Uno News April 28, 2016 University Of Nebraska Names Teaching, Research And Engagement Awardees, University Communications

Employee-Related

University Announcement: University of Nebraska Names Teaching, Research and Engagement Awardees.

Design And Separation Mechanism On Separator For Pea Embryo Skin By Centrifugation, Dong Huanjun, Li Jiapeng, Sun Chuanzhu

Food and Machinery

A centrifugal pea embryo skin separator was designed, and its separation mechanism was also analyzed. The embryo skin did the circular motion under the action of the friction force when it entered the high-speed rotating disk and was thrown out by overcoming the friction force.Due to the different apparent density between the bean embryo and skin, the larger apparent density of the bean embryo was throwninto the outside received barrel, and the smaller apparent density of the bean skin was fallen into the inside received barrel. So chang the height of the received barrel relative to the separation disc can …

Research Of Super High Pressure Food Processing Equipment’S Synchronization Control System, Luo Wei

Food and Machinery

High pressure sterilization equipment’s strict sealing requires the synchronization system which push plug’s movement must have high synchronization accuracy. However, because of the dynamic load, friction, oil leakage, the plugeasily prone to deflection, which are greatly affecting the sealing performance. Considering about this problem, the synchronous system’s mathematical model was established. And then, the control method was also proposed: a PID control was using to the horizontal motion. And the fuzzy PID was used to control the deflection movement. The simulation results show that: the plug under this control strategy not only has a high precision horizontal motion, but also …

Wsu Board Of Trustees Meeting Minutes, April 28-29, 2016

Board of Trustees Minutes

Minutes from the Wright State University Board of Trustees Meeting held on April 28-29, 2016.

The Ko-Lee Key Exchange Protocol With Generalized Dihedral Groups, Christopher Lloyd

Departmental Honors & Graduate Capstone Projects

Given an arbitrary abelian group A, one may form the generalized dihedral group D(A). As D(A) is usually non-abelian, this makes it a possible candidate for use with certain non-commutative key exchange protocols. Specifically, we examine the security of using D(A) with the Ko-Lee key exchange protocol. An appropriate presentation for D(A) is developed alongside methods for computing within the group in the context of the Ko-Lee protocol. Lastly we show that for such groups Ko-Lee is susceptible to a polynomial time attack.

Synthesis Of Structurally Ordered Platinum-Iron Catalysts With Enhanced Oxygen Reduction Reaction Activity, Ye-Zheng Cai, Ming-Chuan Luo, Fang-Hui Wang, Zhao-Nan Sun, Hong Zhu

Journal of Electrochemistry

To improve oxygen reduction reaction catalytic activity of the precious metals platinum for fuel cell, the precursors of carbon-supported structurally disordered platinum-iron alloy (D-Pt₃Fe/C and D-PtFe/C) catalysts with different compositions were synthesized via a modified polyol reduction method. Then, by optimizing the annealing conditions in the inert gas, we turned the structurally disordered platinum-iron alloy to the structurally ordered platinum-iron alloy (O-Pt₃Fe/C and O-PtFe/C) catalysts. The structural characterizations of the as-prepared catalysts were performed by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and X-ray photoelectron spectroscopy (XPS). The results …

Can Nba Teams Benefit From Losing?, Ryan P. Hallisey

Honors Scholar Theses

It has been speculated that franchises in the NBA (national basketball association) lose on purpose because of the benefits that coincide with a team having a poor overall record. Teams that perform the worst are given the highest draft selections in the following season's rookie player draft, thus theoretically improving their chances of becoming a more winning team. Previous economists have used various methodology to prove that NBA teams do in fact lose on purpose; or tank. This paper builds upon this previous methodology to examine the direct impact, negative or positive, that losing on purpose has had on various …

Reflective Assessment, Feedback And Academic Achievement In High School Mathematics, Nalline S. Baliram

Education Dissertations

The purpose of this study was to determine the effects of metacognitive strategies and content-specific feedback on student achievement in high school mathematics. Participants in the study consisted of a convenience sample of honors geometry students in grades 9 and 10 in a private high school located in Daytona Beach, Florida. Beyond answering the specific research questions raised in the study, an additional aim was to contribute to the growing body of knowledge pertaining to effective ways to use metacognitive instruction and provide effective content-specific feedback to improve student achievement and learning.

A quasi-experimental, nonequivalent control-group design with repeated-measures was …

The Colby Echo (2016-04-28), Colby College

The Colby Echo

Published by the students of Colby College since 1877, The Colby Echo is the weekly, editorially independent student-run newspaper of Colby College in Waterville, Maine. Published monthly, 1877-1886; semi-monthly, 1886-1897; and weekly, during the academic year, 1898-present.

Comparison Of Gaussian And Super Gaussian Laser Beams For Addressing Atomic Qubits, Katharina Gillen-Christandl, Glen D. Gillen, M. J. Piotrowicz, M. Saffman

Physics

We study the fidelity of single-qubit quantum gates performed with two-frequency laser fields that have a Gaussian or super Gaussian spatial mode. Numerical simulations are used to account for imperfections arising from atomic motion in an optical trap, spatially varying Stark shifts of the trapping and control beams, and transverse and axial misalignment of the control beams. Numerical results that account for the three-dimensional distribution of control light show that a super Gaussian mode with intensity I~ e^-2(r/w₀)n provides reduced sensitivity to atomic motion and beam misalignment. Choosing a super Gaussian with n = 6 …

The Grizzly, April 28, 2016, Brian Thomas, Valerie Osborne, William Diciurcio, Erin Mckinney, Kanna Higuchi, Justin Ellick, Tyler Arsenault, Sarah Hojsak, Phoebe French, Leighnah L. Perkins, Hunter Gellman, Johnny Cope

Ursinus College Grizzly Newspaper, 1978 to Present

Students Prep for Philly Experience • Commencement Speakers and Valedictorians Named • Berman Displays Student Art • End of Year Q&A with President Brock Blomberg • International Perspective: Lessons Learned From Time at Ursinus • Passion for Politics • A Summer Spent at School • Q&A with a Junior Being Inducted into Phi Beta Kappa • Opinions: Rugby Players are Athletes Too; The Red and Old Gold Needs to Go Green • Ruck and Roll • Women's Golf Completes Record-Breaking Season

The Parthenon, April 28, 2016, Megan Osborne

The Parthenon

The Parthenon, Marshall University’s student newspaper, was published by students Monday through Friday during the regular semester and weekly on Thursdays during the summer. Due to budgetary constraints, beginning with the 2015 Fall semester, the newspaper is only published four days a week. There is no issue on Mondays, physical issues are printed on Tuesdays and Fridays, and online issues only are published on Wednesdays and Thursdays. The editorial staff is responsible for the news and the editorial content.

The Missouri Miner, April 28, 2016

The Missouri Miner Newspaper

No abstract provided.

Mini-Review: Possible Applications Of Scanning Electrochemical Microscopy (Secm) In Characterizations Of Oxygen Reduction Reaction And Oxygen Evolution Reaction, Xing-Xing Chen

Journal of Electrochemistry

Scanning electrochemical microscopy (SECM) has been proved to be a unique technique for combinatorial screening of localized phenomena for different electrocatalysts potentially used in new energy conversion and storage systems. This mini-review provides a brief summary of different SECM working modes, such as direct mode, feedback mode, generation-collection mode, redox competition mode and noise mode, which are especially applied for characterizing the oxygen reactions. Particularly, a series of important development in SECM screening of electrocatalysts for oxygen reduction reaction and oxygen evolution reaction from the author and W. Schuhmann’s group in Germany has been highlighted and overviewed. Finally, some prospects …

Syntheses Of Carbon Paper Supported High-Index Faceted Pt Nanoparticles And Their Performance In Direct Formic Acid Fuel Cells, Long Huang, Mei Zhan, Yu-Cheng Wang, Yan-Fen Lin, Shuo Liu, Ting Yuan, Hui Yang, Shi-Gang Sun

Journal of Electrochemistry

Direct formic acid fuel fuels (DFAFCs) are promising energy source for portable electronic devices. Palladium (Pd) is more active than platinum (Pt) for the formic acid electrooxidation. However, the stability of Pd is much poorer than that of Pt. Unfortunately, the ultra-low natural abundance of the Pt makes it extremely expensive and limits its application as a fuel cell catalyst. Boosting both the activity and stability of Pt nanoparticles to enhance their efficiency is urgent. As previous works illustrated, nanoparticles enclosed with high-index facets usually bare a higher activity toward fuel cell related reactions than those nanoparticles with low-index facet. …

Preparation Parameters Optimization And Electrocatalytic Properties Of Supported Au Nanoparticles, Rui Yao, Yu-Jiang Song, Huan-Qiao Li, Jia Li, Jian-Guo Liu

Journal of Electrochemistry

Due to interesting size effect, physical and chemical properties, nano-scale gold materials have been commonly used to catalytic reactions. However, the application of gold nanomaterials in the field of electrocatalysis is limited. Herein, we report the synthesis of gold nanparticles supported on carbon through chemical reduction of HAuCl₄ by NaBH₄ under mild conditions in the presence of surfactants as soft templates, carbon black or graphene as a support. We investigated a series of key reaction parameters, including reagent concentration, temperature, the types of carbon supports and surfactants. With the optimum synthetic parameters, we successfully obtained supported 1 ~ …

Preparation And Performance Of 3d Graphene Type Porous Carbon Employing Nano Fe(Oh)3 As Template For Oxygen Reduction Catalyst, Chong-Yun Sun, Zhong-Fang Li, Xue-Wei Lu, Xi-Zhan Zhong, Yu-Rong Liu

Journal of Electrochemistry

The 3D graphene type porous carbon was prepared using coal tar pitch as carbon source and nano Fe(OH)₃ as template. Optimal conditions for the catalytic oxygen reduction performance were determined as: the mass ratio of coal tar, nano Fe(OH)₃ and KOH is 6:8:4; the pyrolysis temperature is 800 ^oC. SEM images show that the products have uniformly porous structure. TEM images demonstrate that the products are porous with foam shapes. HRTEM images further indicate that the products have formed several-layers 3D graphene structure, which are also supported by XRD and Raman data, and the pore size mainly …

Nitrogen, Fluorine Co-Doped Silk-Derived Carbon For Electrochemical Oxygen Reduction With High Performance In Alkaline Solution, Fang-Fang Liu, Hong-Liang Peng, Shi-Jun Liao

Journal of Electrochemistry

A high-performance, doped carbon-based catalyst was synthesized by pyrolyzing hydrothermally treated silkworm cocoon. The effects of preparation conditions and fluorine promotion on various catalysts’ performance were investigated. The catalyst prepared under optimal conditions and doped with nitrogen and fluorine possessed the high specific surface area of more than 1000 m^2⋅g^-1 and contained 3.5 and 7.3% (by mass, the same below) N and F, respectively. The activity of the catalyst toward oxygen reduction reaction in an alkaline medium was comparable to that of commercial Pt/C, showing both superior tolerance to methanol poisoning and better durability. Doping with fluorine …

Uab Undergraduates Awarded Fellowship To Participate In Cutting-Edge Research, Staff

Browse All News

No abstract provided.

Peer Assisted Learning: Unexpected Benefits For All Stakeholders – Students, Peer Leaders & Faculty, Marybeth Tobin, Caitlin Golden

Teaching and Learning Together in Higher Education

No abstract provided.