Yang J.,National University of Singapore |
Cheng C.H.,National University of Singapore |
Zhou W.,National University of Singapore |
Lee J.Y.,National University of Singapore |
And 2 more authors.
Fuel Cells | Year: 2010
We have prepared carbon-supported nanoparticles with the heterogeneous structure of a PdPt shell on a PdCo core which are effective for the oxygen reduction reaction (ORR) in the presence of methanol. The preparation was based on the galvanic replacement reaction between PdCo/C nanoparticles and PtCl 42-, a method of general utility which can be extended to the preparation of other core-shell electrocatalysts. The heterogeneous PdCo-core and PtPd-shell architecture was confirmed by multiple techniques including high resolution transmission electron microscopy, energy dispersive X-ray spectroscopy, powder X-ray diffraction and X-ray photoelectron spectroscopy. The activity of the PdCo@PdPt/C catalyst in ORR was evaluated in acidic solutions both with and without methanol (0.1 M). The results showed four to sixfold increases in activity over a standard Pt/C catalyst with no apparent loss of catalyst stability. It is inferred that the strain effect from the lattice mismatch between the shell and core components is the major contributor for the enhancement of ORR activity and selectivity. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
News Article | November 3, 2015
Many modern homeowners are choosing automated thermostats that purport to learn their temperature preferences and activities, then automatically control heat and air conditioning accordingly. Researchers from the University of Virginia and the University of Michigan have developed a system that could lead to the next generation of home thermostats – devices that actually teach people how to be smarter about energy consumption. The team, led by Kamin Whitehouse, Commonwealth Associate Professor of Computer Science in the UVA School of Engineering and Applied Science, is presenting its research for an international audience Thursday at the Association for Computing Machinery's BuildSys conference in Seoul, South Korea. "We don't want to make a smarter thermostat," Whitehouse said. "We want to make smarter people." The system Whitehouse and his team developed is called "ThermoCoach" and it works like this: Sensors, such as motion and Bluetooth sensors, monitor the occupancy patterns of the people in the home and then provide the homeowner with suggestions about optimal heating and cooling schedules based on what the sensors record. The suggestions come in the form of e-mails from ThermoCoach suggesting a range of actions the homeowner can take, from small adjustments to the thermostat for modest savings to more drastic adjustments for larger savings. The key to ThermoCoach is that the homeowner then decides whether and how to act on the information, which means he or she retains all control and responsibility for energy conservation. ThermoCoach never controls the heating or cooling on its own. A study involving 40 homes in the Charlottesville area was conducted in partnership with Trane, a national manufacturer of heating and cooling equipment. Homes using ThermoCoach were compared with homes where people manually programmed their thermostats and also homes where thermostats were fully automated. Study results were promising, Whitehouse said. ThermoCoach saved significantly more than manually programmed thermostats, and conserved, on average, 12 percent more energy than a fully automated thermostat. Test participants also reported staying comfortable in the process. Every bit of conservation counts in a society where thermostats control almost 10 percent of the total energy supply. "It's a huge issue," Whitehouse said. Fully automated thermostats and their predecessors – programmable thermostats – have been important technologies, with a few drawbacks. In the case of programmable thermostats, consumers must have the time and patience to understand and use all of the features. Simply setting morning and evening temperatures is not enough to maximize energy savings. Earlier research by Whitehouse's collaborator, Mark Newman, associate professor at the University of Michigan, found that consumers may be tempted to cede all control to the devices. This removes the sense of responsibility for monitoring the systems to ensure that they are, indeed, providing promised energy savings. "Engaging the user and returning that sense of responsibility is one of the key principles behind the ThermoCoach design," Newman said. "The way autonomous systems interact with humans is very complex, and we don't fully understand that relationship yet," Whitehouse said. "In some ways, autonomous systems can actually be detrimental. They can add complexity to our lives instead of simplifying them." This intersection of automation and human factors is part of what the Engineering School will explore with its new cyber-physical systems initiative. Whitehouse is leading a team that is conducting an international search for eight new faculty members and at least 12 graduate students to join more than a dozen UVA researchers already making strides in the field of cyber-physical systems. Smart home and smart building technology, such as the ThermoCoach system Whitehouse has developed, will continue to be an important part of the initiative. ThermoCoach combines ease of use with the element of human control, Whitehouse said, and participants of the initial study responded well. Now, Whitehouse and his team are planning for a longer study that will cover multiple seasons and allow the team to observe human reactions to ThermoCoach over a longer period of time. The technology in ThermoCoach could be adapted to other applications of energy conservation, such as lighting. "We hope to see this technology actually being used in thermostats sometime soon," Whitehouse said.
After 12 years of serving as editor-in-chief of the Journal of Thermal Spray Technology (JTST), Dr. Christian Moreau, FASM, TS HoF, has transferred his responsibilities to Dr. Armelle Vardelle, FASM, announced Dr. Robert C. Tucker, Jr., FASM, TS HoF, chair of the Journal of Thermal Spray Technology Committee. Dr. Vardelle has been Lead Editor of JTST since 2013, and prior to that was an associate editor of the journal from 2006 through 2012. She will be succeeded as Lead Editor by Dr. André McDonald. Dr. Moreau became JTST editor in 2004, and led the journal through a period of extraordinary growth, in which the journal increased from a quarterly to six issues a year in 2007, then to eight issues in 2013. Building on the strong foundation laid by JTST Founding Editor Chris Berndt, FASM, TS HoF, Dr. Moreau enlarged the editorial staff to its current complement of five associate editors by identifying individuals who were both well-qualified technically and representative of the international readership of the journal. Furthermore, he created the position of "Lead Editor" to focus on special topical and event-related issues of the journal. Throughout Dr. Moreau's term as editor, the journal has continued to grow in number of submissions, quality, and articles published. Working closely with former JTST Committee chair Jockel Heberlein and Chris Berndt, Dr. Moreau brought into reality an annual special double issue containing invited and expanded papers originating from the International Thermal Spray Conference. He also led the journal through its transition into the publishing partnership with Springer, which has greatly increased the visibility and accessibility of the journal throughout the world. A professor at Concordia University (Canada Research Chair, Thermal Spray and Surface Engineering), Dr. Moreau will continue to offer the journal the benefit of his experience by remaining involved as a member of the JTST Committee. "On behalf of the ASM staff who have worked with Christian on JTST, I thank him for his unceasing insight and dedication," said Mary Anne Fleming, senior content developer of Journals at ASM International. "He has skillfully led the journal for the past 12 years, and now has ensured its future success by identifying a capable and qualified successor. We are delighted that Armelle has agreed to step into the editor position." Armelle Vardelle (D.Sc. 1987; Ph.D. 1979, M.Sc. 1975, B.Sc. 1973) is professor, University of Limoges, France. She is Co-Chair of the Department of Materials (Surface Treatments and Environment) at the Engineering School of the University of Limoges (Ecole Nationale Supérieure d'Ingénieurs de Limoges, ENSIL). She holds the title of Distinguished Professor and is involved in research in the laboratory of Sciences of Ceramics and Surface Treatment Processes, UMR-CNRS in the European Ceramic Center. Dr. Vardelle's current research interests are thermal spray and thermal plasma processes, modeling of plasma processes and torch operation, transport and chemical rate phenomena at high-temperature, thermal-sprayed coatings, and green manufacturing. Her teaching interests include thermal spraying, surface engineering, thermal sciences, transport phenomena in surface engineering processes, materials properties, industrial ecology, and lif cycle analysis. She has authored or coauthored more than 111 peer-reviewed scientific journal publications, 141 publications in International and National Conference Proceedings, and seven book chapters. She has presented 42 invited lectures at international conferences and 11 invited seminars at foreign universities. She has been a member of the Editorial Board of Plasma Chemistry and Plasma Processing since 2009. She became a Fellow of the International Plasma Chemistry Society in 2015 and a Fellow of ASM International in 2012. As newly-appointed editor-in-chief of JTST, Dr. Vardelle joins Dr. Tucker is announcing that Dr. André McDonald, University of Alberta, has been named Lead Editor of the journal. Dr. McDonald is chair of the ASM Thermal Spray Society Training Committee, Lead Editor of the 2015 International Thermal Spray Conference Proceedings, and has served as a guest co-editor of the journal. Currently an Associate Professor in the Department of Mechanical Engineering at the University of Alberta, Dr. McDonald received his BSME from the City College of New York (CCNY) in 2001, where he was the DuPont Mechanical Engineering Distinguished Graduate and won the Peggy Benline, Eliza Ford, and ALCOA awards. He was granted his MSME from that same institution in 2002. He received his Ph.D. from the University of Toronto in 2007, followed by a short post-doctoral fellowship at the Industrial Materials Institute - National Research Council Canada (IMI-NRC) in Boucherville, Québec. Dr. McDonald's current research includes the development of flame-sprayed coatings to provide wear and erosion resistance and to provide heating and structural health monitoring to polymer-based airfoil structures. In the area of cold-spraying, he has been working to develop a variety of metal matrix composite coatings with alumina or tungsten carbide as the reinforcing particle material. Since 2006, his work has resulted in 33 peer-reviewed journal articles, 39 conference articles, a textbook on the practical design of thermo-fluids systems, an industrial manual for thermal spraying for the oil and gas industry, 26 industrial reports, and several awards including the International Thermal Spray Conference and Exposition Best Paper Award, the Harold C. Simmons Best Paper Award from ILASS-Americas, the Composites Conference Best in Track Technical Paper Award for Manufacturing, and the Association of Professional Engineers and Geoscientists of Alberta's Early Accomplishment Award. Since becoming a professor, Dr. McDonald has trained 50 students, at both the graduate and undergraduate levels, in the areas of thermal spraying and/or heat transfer.
News Article | October 28, 2016
While he was in college, Ricardo Solorzano spent more than three years working under scientists to push the frontiers of regenerative medicine. He saw the field quickly moving toward 3D bioprinted organs — that scientists are getting closer every day to turning what seems like an impossible science fiction experiment into reality. He started building a next-generation device in his dorm room at the University of Pennsylvania's Engineering School, with the help of Daniel Cabrera, a biology and computer science student, and another student Sohaib Hashmi. What resulted was the first prototype of BioBots, a high-resolution desktop 3D bioprinter that builds human tissue. After more iterations, the team built out the final version of the desktop 3D bioprinter, and it only costs $5,000. If you don't know much about bioprinting, that may not seem as unbelievable as it actually is. But that cheap of a bioprinter is unheard of. 3D bioprinting is still in its nascent stages. There are several companies and universities already pushing the boundaries of the technology for their specific research, but for the general public, experimenting with bioprinting seems like a pipe dream. One example is Dr. Anthony Atala at Wake Forest Institute for Regenerative Medicine, who has printed ears, cartilage, and skin; another is Organovo, a San Francisco-based company that is printing all kinds of human tissue; and a third — one that we're particularly excited about here at TechRepublic — is a six-axis robot 3D bioprinter made by Advanced Solutions in Louisville, Kentucky that is workinf toward printing working heart tissue. "3D bioprinters are a research tool for most. They're tools that can be used to investigate the cell and molecular biology of tissues today and that will be used to manufacture implantable tissues and organs in the future," Cabrera said. "The problem is that most 3D bioprinters are giant over-engineered monsters that need their own separate rooms, an entire team of dedicated technicians, and hundreds of thousands of dollars to be operated effectively - in other words, they're inaccessible to most researchers that are interested in exploring 3D tissues, they've been a huge bottleneck in the growth and development of the field." Cabrera and his team want to solve that problem. In short, they want to become the PC of bioprinters. BioBots has a vision of 3D bioprinters that can sit on every lab bench, giving every biomedical researcher the ability to experiment with 3D tissues. The devices are compact (about the size of the average MakerBot desktop printer) and fairly simple to use. The printer prints cells and other biocompatible material such as cartilage. So how does it work? The cell solution, which contains living, growing cells as well as vasculature, is extruded from the printer similar to how regular desktop 3D printers work. Then, once the cell material has been extruded, UV light hardens it, one layer at a time. So the BioBot can be used to print living cell tissue to regenerate organs, or supplemental structures for organs and tissue in the body. Cabrera said BioBots also has potential for the pharmaceutical industry. "By using 3D tissues built out of human cells in conjunction with animal models they will gain a much deeper understanding of which compounds work, saving millions of dollars in the drug development pipeline," he said. Some early adopters of the printers include Dr. Kara Spiller at Drexel University, and clients in New York, Australia, Indiana, and Maryland. Cabrera said the company is taking orders via the website, and they'll head to SXSW this month to pitch as an accelerator finalist. "We are using the BioBot printer to build complex tissue-like structures that will allow us to study the processes that occur in tissue development and disease," Spiller said. "We hope that these insights will lead to the development of new drugs or strategies to stimulate tissue regeneration following injury. We may also be able to use tissue engineering techniques to grow new tissues in the lab in order to replace damaged tissues in the body." Cell material interactions are critical in every tissue type in the body, Spiller added, so there is a lot of potential for the printers. And since they're affordable, she feels comfortable recommending them to other colleagues and researchers. "They're small enough to be portable, so you can bring them to a colleague's' lab, and to fit easily in a sterile culture hood, making cell culture easier," she said. With more affordable bioprinters like BioBots, the technology becomes more democratized and research developments can happen faster. Bioprinting is one of the most intriguing areas of the 3D printing industry, and the next decade will be exciting as technologists and physicians team up to figure out how to effectively 3D print working body parts. In 2015, the Oxford English Dictionary added "bioprinting" as an official word. However small, for those of us who have been watching this industry closely, that's quite an exciting development in itself. Just take a look at their example sentence: "Welcome to the age of bioprinting, where the machines we've built are building bits and pieces of us."
News Article | November 14, 2016
DAYTON, Ohio, Nov. 14, 2016 (GLOBE NEWSWIRE) -- CareSource, a nonprofit health plan, has named a new executive to its leadership core team. As Chief Consumer Officer, Tony Tomazic will drive the strategy for all CareSource consumer interactions. The new executive position was created at a time of rapid expansion for the health plan, which has grown to serve 1.5 million members in four states. As CareSource continues to expand into more markets and launch new products, Tomazic is charged with building on the company's 27-year history of member-centric health coverage. He will lead the company's strategy to deliver an extraordinary experience while ensuring the health plan differentiates itself from competitors. In his role, Tomazic will oversee CareSource's Enterprise Marketing and Communications, Consumer Experience, Life Services, Consumer Advocacy Group and the CareSource Foundation. Tomazic's background demonstrates a multifaceted depth of talent in science, arts, leadership and business. He has served as an executive leader in health care for both payer and provider organizations. Most recently, he was at St. Luke's Health System in Boise, Idaho, where he served as Vice President and Chief Transformation Officer, and oversaw marketing and innovation. At Humana in Louisville, Kentucky, Tomazic was Director of Consumer Innovation. "Prominent throughout Tony's impressive career trajectory is his passion for delivering an unsurpassed consumer experience through high-impact, brand-building programs and services," said Pamela Morris, CareSource President and CEO. Tomazic's extensive education includes a Bachelor of Science in Chemistry and Physics from Vanderbilt and Belmont University, attending the U.S. Naval Engineering School, a Bachelor of Arts in Studio Art from Western Kentucky University and a Master of Humanities from Western Kentucky University. About CareSource CareSource is a nonprofit health plan nationally recognized for leading the managed care industry in providing member-centric health care coverage. Founded in 1989, CareSource is one of the nation's largest Medicaid managed care plans. Today, CareSource offers a lifetime of health coverage to more than 1.5 million members across four states including offerings on the Health Insurance Marketplace and Medicare Advantage plans. Headquartered in Dayton, Ohio, CareSource has a workforce of 3,100 employees. CareSource is living its mission to make a lasting difference in its members' lives by improving their health and well-being. CareSource understands the challenges consumers face navigating the health system and works to put health care in reach for those it serves. For more, visit caresource.com, follow @caresource on Twitter, or like CareSource on Facebook. A photo accompanying this release is available at: http://www.globenewswire.com/newsroom/prs/?pkgid=41879
Pacios A.,Technical University of Madrid |
Postigo S.,Engineering School |
Huerta C.,Technical University of Madrid
Stahlbau | Year: 2011
This paper presents results from experiments on soft impact testing of glass plates. In the experiments, a 50-kg twin-tire pendulum was used to strike different glass plates at speeds of up to 4.85 m/s. The impact parameters that were defined and measured include the micro-strain in the glass plates, pendulum acceleration, duration of contact, pendulum height, and maximum tire track values. A total of 240 impacts on 17 specimens were carried out for different glass thicknesses (5,6,8, and 10 mm) and boundary conditions (four sides, two sides and four pin points supported). Tempered monolithic and toughened bi-layered laminated plates were tested. To find out if the selected parameters represent the phenomena, multiple regression analysis was carried out. © Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.
Ghaddar M.,Engineering School |
Talbi L.,University of Quebec at Outaouais |
Nedil M.,Engineering School |
Ben Mabrouk I.,University of Tabuk |
Denidni T.A.,Wireless Communications
IET Microwaves, Antennas and Propagation | Year: 2016
This study reveals the interests towards the use of directional (D)-multiple-input and multiple-output (MIMO) setup as a potential solution to overcome the severe propagation loss of inherent line of sight (LOS) mm-waves communications in underground mine. To show the advantages of the proposed D-MIMO, two separate measurement campaigns are assessed in a comparative way; the first uses a single-input single-output (SISO), while the second uses a 2 × 2 D-MIMO system. Furthermore, due to the unavoidable blockage of direct LOS in underground mines, the miner's shadowing effects (NLOS-MSE) are investigated. Thus, using both D-SISO and D-MIMO setup, the channel propagation characteristics are extracted and investigated with and without the presence of a miner completely blocking LOS. Under LOS, results show that, besides offering a reliable mm-waves link budget, D-MIMO restrains the average path loss (PL) by more than 4.7 dB, further suppresses the root mean square delay to 1.85 ns and offers an average capacity of 23.3 bits/s/Hz. As a miner completely blocks LOS, the proposed D-MIMO system has shown a greater signal ability to overcome the effects of a miner's body; NLOS-MSE compensation of about 4.3 dB and a capacity gain of 19.6 bits/s/Hz have been achieved over the conventional SISO system. © The Institution of Engineering and Technology 2016.
Wang K.,Southwest Jiaotong University |
Chen W.,Southwest Jiaotong University |
Han M.,Engineering School |
Li Q.,Southwest Jiaotong University |
You Z.,Southwest Jiaotong University
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012
The air breath proton exchange membrane fuel cell takes the advantage of high starting speed and high efficiency, so it is wildly used in medium and small-power fuel cell. The structure of the air breath proton exchange membrane fuel cell is simple, which includes an accessary fan to breathe and cool the fuel cell. Therefor, the wind speed of the fan has a great impact on fuel cell performance. The electrochemical impedance spectroscope (EIS) of fuel cell under different wind speed was measured by the combing use of simplified Randles model and current interrupt method, and the analysis of the experimental results were carried out too. Compared with the traditional method, this method has a better timeliness that it can measure the instantaneous impedance spectroscopy, this method also takes less time and do not need expensive equipment. The experimental result shows that high wind speed led to membrane flooding, on the other hand, low wind speed led to oxygen shortage. As a result, a proper wind speed makes the fuel cell perform better. © 2012 China. Soc. for Elec. Eng.
Rodriguez-Quinonez J.C.,Autonomous University of Baja California |
Sergiyenko O.,Autonomous University of Baja California |
Hernandez-Balbuena D.,Autonomous University of Baja California |
Rivas-Lopez M.,Autonomous University of Baja California |
And 2 more authors.
Opto-electronics Review | Year: 2014
Many laser scanners depend on their mechanical construction to guarantee their measurements accuracy, however, the current computational technologies allow us to improve these measurements by mathematical methods implemented in neural networks. In this article we are going to introduce the current laser scanner technologies, give a description of our 3D laser scanner and adjust their measurement error by a previously trained feed forward back propagation (FFBP) neural network with a Widrow-Hoff weight/bias learning function. A comparative analysis with other learning functions such as the Kohonen algorithm and gradient descendent with momentum algorithm is presented. Finally, computational simulations are conducted to verify the performance and method uncertainty in the proposed system. © 2014, Versita Warsaw and Springer-Verlag Wien.
News Article | December 2, 2015
« Volvo to introduce new S90 sedan with plug-in hybrid version at Detroit show in January | Main | INVISTA and LanzaTech make breakthrough for bio-derived butadiene production; metabolic toolkit » On the sidelines of the COP21 summit, Carwatt and its partners Renault, Paris City Council, BPI France, the Alès École des Mines Engineering School, and the Bobigny Business Campus are showing a converted Renault Trafic powered by second-life lithium-ion batteries recycled from Renault electric cars. When, over time, the batteries of a Renault electric vehicle fall the performance threshold specified for their initial automotive power duty (around 75% of initial capacity), they can still provide valuable service in “second-life” applications before end-of-life disposal at a recycling centre. Experiments are already under way on power storage applications, for example. Carwatt uses these batteries to convert used urban commercial vehicles into electric vehicles. Electric conversion of urban commercial vehicles reduces investment levels as well as makes a concrete and immediate contribution to reducing urban pollution levels, since 94% of commercial vehicles are diesel-fueled. In 2016, Carwatt and Paris City Council will be experimenting with other Renault commercial vehicles converted to run on electricity.