Tuesday, October 16, 2012

Professor John Donoghue named to The Institute of Medicine



The Institute of Medicine, one of the National Academies of Science, announced today that John Donoghue, the Henry Merritt Wriston Professor of Neuroscience and Engineering, has been elected as a member. 
“I am honored to receive this high recognition and to become part of an organization so dedicated to advancing progress in science, medicine and health care,” said Donoghue, who joins four other Brown colleagues as active members of the IOM. 
Donoghue directs the Brown Institute for Brain Science. He also pioneered and co-leads research on BrainGate, an investigational brain-computer interface now in clinical trials that is designed to help people with severe paralysis regain the ability to communicate and control their environment. In all, the IOM named 70 new members and 10 foreign associates this year. “Through their research, teaching, clinical work, and other contributions, these distinguished individuals have inspired and served as role models to others,” said IOM President Harvey V.Fineberg.

Thursday, October 11, 2012

Five Questions With: Parker Wells, founder of Overhead.fm

Wells, who graduated from Brown in May with a degree in mechanical engineering, talked to Providence Business News about his triumph at the R.I. Business Plan Competition and his experience launching a technology startup.

PBN: Can you tell us a little bit about Overhead.fm and how it works?

WELLS: Overhead.fm is a streaming background music service. We have created an online music service like Pandora or Spotify, but our music is licensed to be played in public spaces like coffee shops, restaurants, doctors offices. This means that any storeowner can subscribe to our service and play music over any computer, tablet or smartphone. We have organized music into business-friendly commercial-free playlists, so you can quickly gain access to the right sound for your store without having to worry about the complicated world of music licensing.

PBN: Since winning the student track of the R.I. Biz Plan Competition, you moved on to StartEngine, an Los Angeles-based startup accelerator, how has that been going for you?

WELLS: Getting our start with the Rhode Island Business Plan Competition was an unbelievable boost for Overhead.fm. It gave us the ability to focus on building a company full-time and gave our business model the initial validation it needed to get into a selective accelerator program like StartEngine. The program itself has been invaluable in making connections in the music industry and meeting California tech investors. Thanks to a lot of support from the RIBPC and StartEngine we have built our music service, signed licensing agreements for musical performance rights, and have started acquiring customers. Moving from concept to sales in three months has already been an amazing experience and we are picking up momentum.

PBN: Do you plan to come back to Providence or are you staying on the west coast?

WELLS: We are definitely excited about moving back to Providence. The startup culture in Rhode Island is currently going through a renaissance. One of the country’s best and most established accelerators, Betaspring, continues to attract some of the best startups from around the country to our little state. Brown University, our alma mater, is also transforming its entrepreneurship program. The new Business, Entrepreneurship, and Organizations concentration is focused on new ventures, giving technology startups even more support than we have already had. We have made some great connections on the west coast and will continue participate fully in their startup-focused culture during our early funding stages. Providence provides the community that young founders truly benefit from.

PBN: What has been your favorite part of your tech startup experience?

WELLS: This is a tricky question. The best part of being a young entrepreneur is being able to meet and learn from remarkable people. While building this company I been given the opportunity to meet many founders and executives from the most influential tech, music, and entertainment companies. I have also been able to work alongside inspiring entrepreneurs and watch them navigate the many hurdles we all face. There are so many great entrepreneurs and executives out there who are also just really nice people and are willing to sit down and share their experiences.

PBN: What advice do you have for other college students or young people looking to form their own technology startup?

WELLS: I recommend going for it. This is a great time to start a technology startup. As far as advice goes, I would say that the most important thing is the team you work with. If your team is dedicated, skilled, and works well together, you can overcome a lot of challenges.


By Emily Greenhalgh
Providence Business News

Grant for Chemical Innovation Center

Researchers at Brown have been awarded $1.75 million to explore the potential of using carbon dioxide instead of fossil fuels in the production of common industrial chemicals. Advances could reduce the chemical industry’s carbon footprint and help stabilize production costs in the face of ever increasing fuel prices. 

“The goal is to find new ways to produce some of the world’s largest-volume chemicals from a sustainable carbon source that the earth not only has in excess but urgently needs to reduce,” said Tayhas Palmore, professor of engineering and principal investigator on the grant.

The funding comes from the National Science Foundation’s Centers for Chemical Innovation Program. The research team includes Wesley Bernskoetter, Christoph Rose-Petruck, Dwight Sweigart, and Shouheng Sun from the Department of Chemistry, as well as Robert Hurt and Andrew Peterson from the School of Engineering and Nilay Hazari from the Department of Chemistry at Yale. The team is administered by Brown’s Institute for Molecular and Nanoscale Innovation (IMNI).



Tuesday, October 9, 2012

Brown School of Engineering Hosts NEW.Mech Workshop

The Brown University School of Engineering is hosting the 2012 New England Workshop on the Mechanics of Materials and Structures on November 3, 2012, at the Granoff Center.

The one-day workshop aims to bring together the New England Mechanics community with an interest in exploring new directions on the mechanics of materials and structures and sharing the latest advancements in the field. The workshop is free of charge, and is focused primarily around students (graduate and undergraduate) and postdocs. The previous two years have seen tremendous enthusiasm and excitement from the scientific community and Brown is excited to be this year’s host.

The workshop will consist of four plenary invited talks and a number of contributed short talks. There will also be a poster competition, and the workshop will include a new component, the “Gallery of Mechanics”. This event will include movies that display research in the New England mechanics community. There will be awards for the top three entries.

The workshop is being organized locally by Christian Franck and Shreyas Mandre, assistant professors of engineering at Brown.

For more information, please go to: http://www.brown.edu/conferences/new-england-mechanics-materials-structures/

Wednesday, October 3, 2012

Professor Nitin Padture Named Editor of Scripta Materialia

Brown University School of Engineering Professor Nitin Padture has been named editor of Scripta Materialia, one of the leading journals in the field of materials science and engineering. In this role, Padture will serve a four-year term and will handle approximately 300 manuscripts per year.

“It is a great opportunity to contribute toward the shaping of a fast moving field, and I am humbled by the honor,” said Padture.

Padture, Professor of Engineering and Director of the Center for Advanced Materials Research (CAMR) at Brown, joined the Brown faculty in January of 2012. Previously he was College of Engineering Distinguished Professor at The Ohio State University, and also the founding director of the NSF-funded Materials Research Science and Engineering Center (MRSEC) at OSU.

Padture received B.Tech. in metallurgical engineering from Indian Institute of Technology, Bombay (1985), M.S. in ceramic engineering from Alfred University (1987), and Ph.D. in materials science and engineering from Lehigh University (1991).

He was a postdoctoral fellow at the National Institute of Standards and Technology (NIST) for three years, before joining the University of Connecticut faculty in January 1995 as an assistant professor. He became an associate professor in 1998 and was promoted to professor in 2003. He served as interim department head at UConn before moving to Ohio State in January 2005.

Padture’s teaching and research interests are in the broad areas of synthesis/processing and properties of advanced materials used in applications ranging from jet engines to computer chips, impacting transportation, energy, and information technology sectors. Specifically, he has active research in tailoring of structural ceramic composites and coatings, and functional nanomaterials including graphene and perovskites.

Padture has published over 125 journal papers, which have been cited over 5,000 times. Padture is a co-inventor of four patents, and he has delivered some 150 invited/keynote/plenary talks in the U.S. and abroad. A fellow of the American Ceramic Society, he has received that society’s Roland B. Snow, Robert L. Coble, and Richard M. Fulrath awards. Padture is also a recipient of the Office of Naval Research Young Investigator Award, and he is a Fellow of the American Association for the Advancement of Science. Previously, Padture served as a principal editor of Journal of Materials Research and an associate editor of Journal of the American Ceramic Society.

Monday, October 1, 2012

Brown to lead multi-university quantum metamaterials research

Through a new Multidisciplinary University Research Initiative (MURI) awarded by the Air Force Office of Scientific Research, Brown will lead an effort to study new optical materials and their interactions with light at the quantum scale. The initiative, which includes six other top universities, will receive $4.5 million over three years, with a possible two-year extension.

Harnessing the power of light at the quantum scale could clear the way for superfast optical microprocessors, high-capacity optical memory, securely encrypted communication, and untold other technologies. But before any of these potential applications sees the light of day, substantial obstacles must be overcome — not the least of which is the fact that the wavelength of light is larger than quantum-scale objects, limiting the range of possible light-matter interactions.

Rashid Zia
"This program will bring together ten groups and 40-plus
researchers... to help answer questions that we couldn't
have imagined a short time ago. We are very optimistic
about where this will lead."
Rashid Zia, the Manning Assistant Professor of Engineering, will lead the team in addressing these challenges. He spoke recently with science writer Kevin Stacey.

What are you hoping to accomplish with this MURI?
We’re trying to help define an emerging field. The title of the MURI is “Quantum Metaphotonics and Quantum Metamaterials.” Ultimately what we’re trying to do is expand the range of materials and light-matter interactions available for quantum optics.

The field of metamaterials has already expanded the range of optical materials and phenomena available at larger, classical scales. People are doing things with metamaterials that we couldn’t have imagined before. For example, researchers are making metamaterials with negative refractive indices, which can literally bend light backward around objects. Others have used metamaterials to make lenses that can image things smaller than the diffraction limit of traditional lenses. What we’re doing now is asking what happens when we bring these metamaterials down to the scale of quantum emitters — the level of things that can emit a single photon at a time.

Can you talk a bit about the challenges involved in doing this?
When you talk about the way light interacts with matter at the quantum level, the types of interactions and the strength of those interactions are limited by a size mismatch. The optical wavelength is something like 100 times larger than a quantum emitter. For example, a quantum dot — a small bit of semiconductor we can use as a light emitter — is 5 to 10 nanometers. The wavelength of light is on the order of 500 to 1,000 nanometers. The problem is that the quantum dot doesn’t know there’s a wave. It can’t see the spatial variation of the light wave, just its local variation in time. So we need to shrink the wavelength of light to increase our interactions. Or we might increase the wavelength to collectively interact with many quantum emitters. And hopefully we can learn something fundamental about the nature of light that opens up new ways of manipulating these interactions. Those are the types of things we’ll be addressing.

In quantum optics we’re limited in part by the kinds of materials we can use. One of the common materials for quantum optics today is the nitrogen vacancy defect in diamond, so-called diamond NV centers. As you can imagine, diamond is not the cheapest or most scalable technology. The challenge posed for us is how to use the semiconductor materials we use for electronics and extend their optical properties with metamaterial designs, so we can perform quantum optics at wavelengths and with materials commonly used in telecommunications today.

How does the research you’re doing in your lab at Brown fit in?
It’s usually assumed that all light-matter interactions at visible frequencies result from the push-pull forces exerted by electric fields. These are called electric dipole transitions. One of the things we do in my lab is study things that aren’t electric dipoles — for example, magnetic dipoles. Because of the size mismatch we just discussed, it’s often assumed that magnetic dipole transitions are around 100,000 times less likely to happen than electric dipole transitions. In other words, it’s assumed that light emission from magnetic dipoles simply doesn’t happen. But the fact is we see magnetic dipole emission every day from the lanthanide ions that are commonly found in fluorescent lights. What we’ve been able to do is quantify the magnetic nature of light.

We just published a paper on this in Nature Communications. Basically, we demonstrated a way to tell how light was emitted, and rather than simply counting the number of photons a system generates, we can tell you which fraction of them came from electric dipoles and which fraction came from magnetic dipoles. This helps us understand fundamental properties about quantum emitters, the source of this light. It might also help us access higher-order light-matter interactions, enabling new ways to modulate light or to trap energy in optical excitations and get it out when you want, which could be useful for things like optical memory.

Who else is involved in this work?
The team includes people who are world-class experts in different areas. Nader Engheta at Penn, Nicholas Fang at MIT, and Xiang Zhang at UC–Berkeley are experts in metamaterials. Harry Atwater at CalTech and Mark Brongersma at Stanford are experts in plasmonics, which is the science of using metal structures to enhance light-matter interactions. Shanhui Fan and Jelena Vuckovic at Stanford are experts in quantum optics. Seth Bank at UT–Austin and Arto Nurmikko and me here at Brown, work on quantum emitters.

It’s really an exciting project. Over the next five years, this program will bring together 10 groups and 40-plus researchers with complementary expertise to help answer questions that we couldn’t have imagined a short time ago. We are very optimistic about where this will lead.

Friday, September 14, 2012

Brown School of Engineering to Host Open House for Prospective Students

The Brown University School of Engineering will hold an open house on Saturday, September 29, from 1:00 p.m. – 4:00 p.m. in room 166 of the Barus and Holley building (184 Hope Street / Corner of Hope and George Streets). The faculty of the School of Engineering and the Office of College Admission invite prospective applicants, parents, teachers, and guidance counselors to attend this open house.

The program will include an overview of the undergraduate programs of study, information about faculty and student research interests, opportunity to meet faculty and undergraduates from the School of Engineering, and a brief overview of admissions and financial aid.

Students are asked to please RSVP online by Monday, September 24. Students may call (401) 863-7930 for further information.

The Brown undergraduate engineering program enrolls 400 students, and is the oldest in the Ivy League and the third oldest civilian program in the nation.  Students may earn a bachelor of science degree in one of six ABET accredited programs: biomedical engineering, chemical and biochemical engineering, computer engineering, electrical engineering, materials engineering, or mechanical engineering.

For any students arriving on campus early, the admission office offers regularly scheduled information sessions at 10:00 a.m. and 11:00 a.m. and campus tours at 10:00 a.m., 11:00 a.m., and noon. Tours leave from the Stephen Robert ’62 Campus Center located at 75 Waterman Street.

Wednesday, September 5, 2012

Meet the New Faculty: Jacob Rosenstein

Biological sensors that detect currents at the nanoscale would have important clinical applications, but how to separate signal from noise when the current lasts for 10 microseconds? Jacob Rosenstein has theories and devices that enable measurement at small timescales.

Jacob Rosenstein enjoyed his undergraduate years at Brown and certainly made the most of them. He graduated magna cum laude and co-founded a company with Anubhav Tripathi, associate professor of engineering. Still, when Rosenstein graduated in 2005, continuing in academia was far from his mind.

Jacob Rosenstein
Assistant Professor of Engineering
Credit: Mike Cohea/Brown University
But seven years later, following a stint in the semiconductor industry and now all but finished with a Ph.D. from Columbia University, he’s set to return to Brown for a job as an assistant professor of engineering. Much as he did while a Brown student, he plans to continue innovating at the nexus of electronics and biology.

“Integrated circuits are all around us, but historically most of the industry focus has been toward computing and communications,” says Rosenstein. “I’m excited to see what we can do to leverage all of that advanced technology for biological and chemical sensors.”

Rosenstein was a busy senior at Brown. At the same time he was developing a new microphone array platform with Harvey Silverman, professor of engineering, he was also working with Tripathi to develop instruments for microfluidic chips, which are integrated circuits that control the flow of fluids rather than electrical current. They founded Gauge Microfluidics in Providence to commercialize the work.

With a resumé of academic brilliance and entrepreneurship, it didn’t take long for Rosenstein to find an industry job. Shortly after graduation, he moved to Boston to join Analog Devices, a major player in the semiconductor business. He worked in the company’s wireless division, helping to develop and test application-specific integrated circuits and working on prototype cell phone designs.

Rosenstein worked at Analog for more than two years before his whole business unit was sold to the Taiwanese company MediaTek. He was still happy there, but he had begun to do some professional soul searching. The desire to gain more experience in chip design led him back to the notion of graduate school. He enrolled at Columbia in 2008.

In the Bioelectronic Systems Lab of Kenneth Shepard at Columbia, Rosenstein returned to the practice of bringing silicon technology to bear on biophysical systems. At Columbia, his main project has been the design of an integrated circuit amplifier to improve measurements of weak ionic currents. Cell membranes contain a variety of proteins which regulate the movement of dissolved ions in and out of the cell, and the movement of these ions can be measured as an electrical current. However, in many cases this current is very small, making it difficult to measure the signal above the noise. Rosenstein’s amplifier reduces the noise level at high frequencies, considerably improving the quality of fast ion channel recordings.

“As you get down to the range of 10 microseconds or less it gets very difficult to measure that weak current,” he said. “Where I’ve come in is to make new electronics and experimental setups to reduce the noise level and therefore enable measurements at timescales that people have not been able to measure.”

Researchers have been also able to make biosensors inspired by ion channels using very tiny holes called “nanopores.” If its diameter is not much larger than a single molecule, a nanopore can yield a change in its ionic current when a molecule such as DNA passes through the pore. However, these weak signals are usually very brief, making them difficult to measure. In a paper earlier this year in Nature Methods, Rosenstein demonstrated that signals as fast as 1 microsecond can be recorded from individual DNA molecules when a nanopore is integrated with his custom amplifier.

Now back at Brown, Rosenstein is looking forward to exploring other opportunities in bioelectronics. He said the University’s success in harnessing signals directly from neurons in the brain with the BrainGate sensor is a particularly inspiring example.

“There are a lot of other interesting diagnostics, sensors, and hybrid systems that are mostly unexplored,” he said. “I’m very excited to test the waters and get to know the pure sciences and life sciences groups at Brown, and hopefully I can be a hub of instrumentation, sensing, and high-performance electronics.”

Rosenstein returns with an established track record of exactly that.

- David Orenstein/Brown University

Meet the New Faculty: Haneesh Kesari

Understanding a small sea sponge and its ability to anchor itself to the ocean floor, Haneesh Kesari hopes, will point the way to stronger, lighter, better man-made materials.

As an engineer, Haneesh Kesari takes his inspiration from nature.

The new assistant professor of engineering marvels at how nature takes a few proteins and a bit of calcium or silica and creates structures with amazing material properties — emergent properties that might seem impossible given limited raw ingredients.

Haneesh Kesari
Assistant Professor of Engineering
Credit: Frank Mullin/Brown University
“Nature is doing it,” he says, “hence it is possible. How to do it is what my research will be focused on.”

Kesari is currently studying Euplectella, a genus of sea sponges. Sea creatures might seem strange territory for a materials scientist, but Euplectella have peculiarities that make them something of an engineering marvel. Whereas most animal species form their skeletons with calcium, Euplectella are made mostly of silica—glass. But don’t think of these creatures as the fragile Ming vases of the sea. On the contrary, their skeletons are strikingly robust.

Kesari is interested specifically in the root-like appendages that fix the animals to the ocean floor. The glassy structures, called basalia spicules, have properties similar to man-made fiber optic cable, only the sponge-made versions are substantially stronger and more flexible. Imaging these appendages at the nanoscale reveals an intricate construction. Each spicule is made of concentric layers, some made of glass, others made of a polymer. It’s the pattern in which these layers are arranged that caught Kesari’s attention.

“You see it and think, ‘Is this really an animal skeleton or is it a figure from a math book?’” he said. “It had an algorithmic beauty to it. We didn’t know what the algorithm was, but felt that there had to be one, because it had such regularity to it.”

Kesari thought this pattern might contribute to the spicules’ renowned strength, so he set to work calculating what pattern of layers would be the strongest given the materials in the spicule. “We calculated it and it so happens the resulting algorithm matches very well with what we see in the spicule,” he said.

Amazing what nature can accomplish given enough time.

Understanding these sorts of mathematical regularities in nature could lead to the man-made materials of the future. It’s a slow and difficult process, Kesari says, but Brown is the perfect place for that sort of research. There’s a culture in the School of Engineering that “encourages the pursuit of rigor and thoroughness, and rewards originality and creativity,” he says. “It’s nice to see the traditional quality of science — the main reason why many of us chose to do science in the first place — is retained here.”

Not to mention, he adds, that Brown is known for employing many of the “rock stars” in the field of solid mechanics over the years.

Aside from his work on Euplectella, Kesari has worked extensively on understanding adhesive properties and surface roughness, including a theoretical basis for why things like sticky notes and packing tape stick better when you push them down harder. He also studies failure patterns in polymer-based materials.

Kesari earned his Ph.D. from Stanford in 2011. He grew up in southern India, where his fascination with engineering started.

“My father worked in irrigation,” he said. “One of the early experiences I had was going to these small irrigation canals to play. The entire community revolved around water for crops and everything else, and I could see how just having a simple stone structure changed people’s lives so dramatically.”

He came to view engineering as humanity’s way of putting our collective foot down, no longer helpless against the blind whims of droughts and floods.

“Engineering, it seems to me, is a very special enterprise,” he said. Through it “we control our own destiny.”

- Kevin Stacey/Brown University

Tuesday, September 4, 2012

Meet the Faculty: Jennifer Franck

Passenger jet or flapping bat, Jennifer Frank writes code that simulates the flow of air around things with wings. The computational approach has advantages and efficiencies, especially for someone to whom coding comes naturally.

Jennifer Franck’s first foray into computing was on the venerable, if rudimentary, Commodore 64. As a child, she tapped out simple looping programs that sent a series of numbers to her printer. Since those early days, Franck’s programs have gotten considerably more complex.

Jennifer Franck
Lecturer in Engineering
Credit: Mike Cohea/Brown University
The new lecturer in engineering is an expert in computational fluid dynamics. She writes programs that simulate how fluids and gases flow around objects. Specifically, she codes what are called large-eddy simulations, a class of code designed to study turbulence. She mostly uses her model to investigate the dynamics of flight — how wind interacts with wings.

After earning her Ph.D. in mechanical engineering from Caltech in 2009, she came to Brown as a postdoc to work with Kenneth Breuer in engineering and Sharon Swartz in ecology and evolutionary biology, who are widely known for their research on the mechanics of bat flight. “What I was interested in was to see if I could explain some of the characteristics of animal flight using my models on the computer,” Franck said.

One of the questions Franck looked at is why bats flap their wings, as opposed to using them for soaring flight. “There’s a theory that bats evolved from passive gliders to actively flapping their wings,” she said. “The question was, what’s the benefit of flapping.”

Franck’s models helped to show that flapping creates vortices — tiny pockets of low air pressure — above a bat’s wings. Those vortices create extra lift and may be part of the reason flapping is worth the effort.

Franck has also used her models to explore applications that might improve aircraft flight. “Say you want an airplane to have more lift,” she said. “Could you apply some sort of device on the wing that would pump some extra energy into the flow and give you better performance? I’m interested in applying code to those types of flow control questions.”

There are significant advantages to the computational approach, Franck says. It’s much easier, for example, to modify the parameters of an experiment on a computer than it is to design new physical models for wind tunnel tests. Another advantage is that computer models help to isolate the specific aspects of a problem that researchers are trying to address.

“We generally model a very simple airfoil that’s often just two dimensional because it simplifies the problem,” Franck said. “If we’re looking at the basic physics behind a problem, we don’t want to make things too complicated.”

Though the models may be simple, the code that generates them is not. Most of Franck’s programs require computer clusters that string together multiple processors. For some of her research, Franck has used a cluster at Brown’s Center for Computation and Visualization. For other projects she’s used the Department of Defense’s Army Research Lab cluster in Maryland.

It’s a long way from the Commodore 64, but Franck is right at home. “Coding has always just come naturally to me,” she says.

She and her husband Christian, professor of engineering at Brown, live in Providence with their two kids.

- Kevin Stacey/Brown University

Meet the Faculty: Indrek Külaots

Graphene — sheets of carbon that are one atom thick — could help take mercury and other nasty pollutants out of circulation if only there were a way to keep the sheets from sticking together. Indrek Külaots is working on a system of nanoscale pillars.

Indrek Külaots is using garbage to make the world a cleaner place.

Indrek Külaots
Lecturer in Engineering
Credit: Frank Mullin/Brown University
Untold tons of plant matter are discarded in the United States every day. Much of this biomass — farm waste, sawdust, wood scraps, household yard waste — is trucked off to landfills. As it rots, it produces carbon dioxide and methane, greenhouse gases that contribute to global warming.

“My research focuses on trying to make better use of this bio-waste material,” said Külaots, lecturer in engineering. He has found a way to turn this trash into sorbent material than can sop up industrial pollutants.

Using a simple technique called pyrolysis — the same process used to make charcoal — plant waste can be broken down into what’s called bio-char. “This char product has relatively high surface area and is also highly porous,” Külaots said. “We can use those pores as workers for pollutant capture.”

He has patented a method of using modified bio-char to absorb elemental mercury. Bio-char could one day be used as a cost-effective way to scrub mercury from power plant vapor emissions, replacing expensive activated carbon filters. Bio-char sorbents also show promise for cleaning up other pollutants like arsenic, cadmium, and lead, Külaots says.

Külaots’ interest in environmental engineering began in his native Estonia. After earning his master’s degree in mechanical engineering at the Tallinn Technical University, he worked on a project to recycle fly ash, a byproduct produced by the burning of oil shale. His work on that subject caught the eye of Eric Suuberg, an engineering professor at Brown. Suuberg thought Külaots’ work could be applied to fly ash created by the burning of coal, which is a major concern in the United States

“He saw my work and said, ‘Why don’t you apply?’” Külaots said. “So I came to Brown as a Ph.D. student and I never left.”

After earning a master’s degree in applied mathematics in 2000 and a Ph.D. in chemical engineering in 2001, Külaots stayed at Brown as a senior research engineer. In 2009, he was awarded a joint position as lecturer and research engineer. This year he joins the faculty as a lecturer.

In addition to teaching classes in chemical, mechanical, and environmental engineering, he’s expanding his research program to include a hot topic in the material sciences world: graphene.

Graphene is a one-atom-thick sheet of carbon, with vast surface area. It began getting notoriety a few years ago and quickly gained a reputation as a miracle material. Its electrical properties make it a likely successor of silicon in microprocessors. It also holds promise as a way to store gases like hydrogen for use in fuel cells, and it can catalyze chemical reactions.

But for all its miraculousness, graphene has a problem. The sheets have a tendency to get stuck together in stacks when processed, which decreases this vast surface area on each sheet. Think of two sheets of paper stapled at all four corners. It’s not possible to write on the back of the first page or the front of the second because those surfaces are stuck together.

“My research is how to interrupt this stacking,” Külaots said. “How can we get something in the middle so we can actually use the inner layer space as well?”

He’s developing tiny carbon columns to do the job.

“It’s just a pillar, like in ancient Rome,” he said. “But when you’re working at the nanoscale it’s not that easy.” Despite the difficulty, Külaots has had success using his pillars to recover some of this lost space, and recently presented his work at one of the world’s top conferences on carbon materials.

“These pillared graphene and graphene oxide systems have a great potential in the fields of gas storage, separation, and catalysis, if properly converted into bulk materials,” he said.

Such is the fast-paced world of engineering: Even before graphene makes it out of the lab and into production, Külaots is thinking of ways to make it better.

-
Kevin Stacey/Brown University

Friday, August 31, 2012

Brown School of Engineering to Host Open House for Prospective Students

The Brown University School of Engineering will hold an open house on Saturday, September 29, from 1:00 p.m. – 4:00 p.m. in room 166 of the Barus and Holley building (184 Hope Street / Corner of Hope and George Streets). The faculty of the School of Engineering and the Office of College Admission invite prospective applicants, parents, teachers, and guidance counselors to attend this open house.

The program will include an overview of the undergraduate programs of study, information about faculty and student research interests, opportunity to meet faculty and undergraduates from the School of Engineering, and a brief overview of admissions and financial aid.

Students are asked to please RSVP online by Monday, September 24. Students may call (401) 863-7930 for further information.

The Brown undergraduate engineering program enrolls 400 students, and is the oldest in the Ivy League and the third oldest civilian program in the nation.  Students may earn a bachelor of science degree in one of six ABET accredited programs: biomedical engineering, chemical and biochemical engineering, computer engineering, electrical engineering, materials engineering, or mechanical engineering.

For any students arriving on campus early, the admission office offers regularly scheduled information sessions at 10:00 a.m. and 11:00 a.m. and campus tours at 9:00 a.m., 10:00 a.m., and 11:00 a.m. Tours leave from the Stephen Robert ’62 Campus Center located at 75 Waterman Street.

Tuesday, August 7, 2012

Brown School of Engineering Hosts Eastman Conference

The Brown University School of Engineering is hosting the 2012 Lester Eastman Conference on High Performance Devices from August 7-9, 2012. The conference will include sessions on green technology; high speed devices; infrared photonics; terahertz technology; power conversion, switching, and transmission; and next generation devices.

The conference will have three plenary speakers: Professor Umesh Mishra (USCB) on Recent Advances in High Frequency Semiconductor Devices; Professor Hideo Ohno (Tohoku Univ., Japan) on Spintronic Devices for VLSI; and Dr. Kamiar Karimi (Boeing Corporation) on High Power Semiconductor Devices.

Larry Larson, Dean of the School of Engineering at Brown, will give a talk on the “Internet of Things”.

The conference is being organized locally by Domenico Pacifici, assistant professor of engineering at Brown. The general chair of the conference is Professor Paul Chow of RPI.

For more information, please go to: http://www.leconf.com/

Monday, August 6, 2012

Do girls need lacrosse helmets?

Joseph Crisco, professor of orthopaedics, wanted to measure the impact of hits to the head in girls’ lacrosse. He invited some players into his lab to take some shots at a test dummy. The data could inform an eventual standard for girls’ and women’s lacrosse.

A little more to the left
To analyze what happens in a girls' lacrosse game when
stick meets head, Joseph Crisco equipped a test dummy
with accelerometers and invited players to take some shots.
Credit: Mike Cohea/Brown University
PROVIDENCE, R.I. [Brown University] — Dr. Joseph "Trey" Crisco, the Henry F. Lippitt Professor of Orthopaedics and Director of the Bioengineering Lab, recently invited female lacrosse players ranging in age from 12 to 28 into his Rhode Island Hospital lab to swing their sticks for a project titled “Head Accelerations from Various Stick Checks in Girls’ Lacrosse.”

The research, funded by US Lacrosse, the national governing body of men’s, women’s and youth lacrosse, and by the National Operating Committee on Standards for Athletic Equipment, will provide data on how the head is accelerated after being hit by a stick. Video analysis of players taking whacks at a helmeted dummy, taken at 1,000 frames per second, could inform an eventual standard for girls’ and women’s lacrosse headgear.

For years, Crisco has studied head impacts in sports such as football, hockey, and lacrosse by embedding accelerometers in the helmets of collegiate teams and gathering data from actual practices and competition.

by David Orenstein

Quantifying the magnetic nature of light emission

In collaboration with The Institute of Photonics Sciences (ICFO) in Barcelona, Brown School of Engineering researchers in the lab of Rashid Zia ’01, Manning Assistant Professor of Engineering, have just published an article in in Nature Communications. Visiting scholar Tim Taminiau from the lab of Niek van Hulst at ICFO worked alongside Brown engineering graduate student Sinan Karaveli to demonstrate how the natural magnetic dipole transitions in lanthanide ions can be used to access optical-frequency magnetic fields.

Authors: Tim H. Taminiau, Sinan Karaveli, Niek F. van Hulst, and Rashid Zia

Examining how light emission is distributed in energy-
and momentum-space can reveal fundamental
information about optical transitions. This image
shows an energy-momentum spectrum of europium ions.
Following bright emissions lines, you may notice
several points where the contrast inverts - these
changes are direct visualizations of the opposite
symmetries of electric and magnetic dipoles transitions.
Abstract:
Tremendous advances in the study of magnetic light-matter interactions have recently been achieved using man-made nanostructures that exhibit and exploit an optical magnetic response. However, naturally occurring emitters can also exhibit magnetic resonances in the form of optical-frequency magnetic-dipole transitions. Here we quantify the magnetic nature of light emission using energy- and momentum-resolved spectroscopy, and leverage a pair of spectrally close electric- and magnetic-dipole transitions in trivalent europium to probe vacuum fluctuations in the electric and magnetic fields at the nanometre scale. These results reveal a new tool for nano-optics: an atomic-size quantum emitter that interacts with the magnetic component of light.

To access the full article, please go to:
http://www.nature.com/ncomms/journal/v3/n7/full/ncomms1984.html

Venture for America fellow Tim Dingman '11 hired by Accio Energy

Accio Energy (Ann Arbor, Mich.) is taking on one of the first Venture for America fellows this month, hiring Tim Dingman '11, an electrical engineering graduate from Brown University.

Venture for America is launching its inaugural class of fellows this summer, pairing 40 fresh college graduates with start-ups in economically challenged regions. The New York City-based non-profit is modeled after Teach for America where it pairs top talent from U.S. universities with innovative start-ups growing in urban areas, such as New Orleans, Las Vegas, Cincinnati and Providence, Rhode Island. The idea is to give college grads an open door into entrepreneurship in the hopes they will launch their own start-ups in their host cities one day.

Metro Detroit companies are receiving 11 of these fellows, and Accio Energy is the only firm from Ann Arbor to receive one. The alternative energy start-up is reinventing the wind energy generation with new technology that creates clean energy from static electricity generated from the wind.

"The novelty of it combined with the size of the company were two huge draws," says Dingman.

Dingman also founded his own start-up, which makes a showerhead efficiency upgrade for dorm rooms. He has been interested in developing clean tech for most if his college career, but wanted to get his professional start working for a young company creating disruptive technology.

"There is a lot of energy there," Dingman says. "There is a lot of room for innovation which is what I was looking for in my placement."

Source: Tim Dingman, fellow with Venture for America
Writer: Jon Zemke

Friday, August 3, 2012

Joseph Calo Named a Fellow of the American Chemical Society

Joseph Calo, Professor Emeritus at the Brown School of Engineering, has been named a Fellow of the American Chemical Society (ACS). Calo is one of 96 fellows in the 2012 class and will be honored at the society’s national meeting in Philadelphia in August.

A founder of the chemical engineering program at Brown, Calo was honored for his research contributions in chemical kinetics and transport phenomena as applied to carbon materials, environmental characterization/remediation, and energy conversion.

He served as treasurer, councilor, technical program secretary and representative of the Fuel Chemistry (now Energy and Fuels, ENFL) Division to the Multidisciplinary Program Planning Group (MPPG), and Divisional Activities Committee (DAC) member of ACS.

"I'd like to congratulate Professor Calo on this spectacular achievement,” said Dean Larry Larson. “Becoming a Fellow of the ACS is a recognition of a lifetime of technical contributions and service to the American Chemical Society. Professor Calo's contributions to Brown and to Chemical Engineering have been and continue to be extraordinary."

The fellows program began in 2009 as a way to recognize and honor ACS members for outstanding achievements in and contributions to science, the profession, and ACS.

Monday, July 30, 2012

LEGO robots make great teachers

A partnership between Brown’s Science Center and the Paul Cuffee Middle School gave 10 young student hands-on instruction in the finer points of computer programming and engineering using LEGO® robots as the teaching tool. Brown engineering students Raymon Baek '14 and Michael Lazos '15 were the instructors for the program.

PROVIDENCE, R.I. [Brown University] — Like sumo wrestlers, two LEGO® robots made their way around an oval ring, grabbing, swatting at each other, and trying with great gusto to push the other robot out of the ring to win the match. Ten young boys — third, fourth, and fifth graders — at the Paul Cuffee Middle School in Providence cheered on their creations, watching in delight as their aggressor responded to pre-programmed commands and light sensors to make their way around the ring in pursuit of the opponent. At each turn, parents and volunteer instructors joined in the cheering at the school’s cafeteria on Friday, July 20th. It was the culmination of a three-week pilot program designed to pique children’s interest in engineering and computer science.

Building a sumo warrior block by block
LEGO® programmers, from left, Aidan Marinelli, Jose Pagan,
and Luke Taylor watch as their team's robot is attacked
by a competitor. It was a sumo-style robotic battle.
Credit: All photos by Mike Cohea/Brown University 
The LEGO® robotic program was a partnership between Brown’s Science Center and the Paul Cuffee Middle School. Ten student participants were divided into two teams — the Panthers and the Demons of Nothingness — and instructed in the finer points of computer programming and engineering using LEGO® robots as the teaching tool. Students used a kit that not only contained LEGO® pieces but robots’ “brains,” which were connected to laptops so students could program the brains to respond to light, touch, ultrasonic, sound, color, temperature, accelerometer, compass, and radio-frequency identification sensors.

Brown students Mike Lazos, a computer engineering concentrator, and Raymon Baek, whose concentration is in mechanical engineering, helped the students design, build and program robots for four hours every day during the three-week summer program. According to instructor Baek the program was a tremendous success.

“The kids were very bright and went beyond our expectations,” Baek said. “We always finished the planned curriculum a lot quicker than expected, which kept Mike and me improvising to stay ahead of the students.”

Keeping a step ahead
Instructors Raymon Baek, left, and Michael Lazos
were surprised at how quickly students mastered
material. In the final battle, the instructors’ own
robot was thrown for a loss.
The students used visual programming software with easily readable icons and distinct colors for each type of tile. For example, movement tiles would tell the robot to move and sensor tiles would tell the program to rely on a specific sensor. The program used wait statements (e.g., wait for a certain sound level or touch sensor to be activated), switch statements (e.g., if the light sensor detects a dark area, move right; move left for a bright area), and loops. These commands made it possible for the robots to compete in the sumo wrestling challenge and an obstacle course.

The students had to be creative about using sensors to follow a zigzag path through the obstacle course, navigating through various boxes, capturing colored balls from a central area, and bringing them back to their starting points. The Panthers easily won the obstacle course because they built a robot that had a robotic arm that pulled nearly all the balls back to its starting point in one trial.

To the victor, the spoils
The robot designed by the Demons of Nothingness
outlasted all competitors.

As for the battle arena, the Demons of Nothingness won because their robot was very bulky and stable. “Mike and I decided to surprise them by introducing our own robot that we assumed was invincible,” said Baek. “We had the three robots fight it out in the ring. To our surprise, our robot was pushed out of the ring and the Demons of Nothingness reigned victorious.”

During the three-week program, the instructors gained some insight about the challenges of teaching. “The boys loved to build, but the programming, which required them to sit still and concentrate was a challenge. They need to get up and run around every so often to burn off some energy,” said Baek.

In this pilot effort, all participants including the students, teachers, learning concept, and execution proved to be a perfect match.

Friday, July 13, 2012

Brown conducts helmet study for girls lacrosse

Joseph "Trey" Crisco, Henry Frederick Lippitt Professor of Orthopaedic Research and Director of the Bioengineering Lab, who has done pioneering research with concussions and football helmets is now studying girl's and women's lacrosse, which does not require helmets. 

Crash-test dummies subjected to a barrage of sticks to the head may help settle the debate over whether helmets should be required in girl's lacrosse.

There has been increased concern over concussions in a sport that prohibits the use of hard helmets, while soft headgear in the girls' game is allowed. Hard helmets are required in the men's version of the game.

Brown University in Rhode Island will conduct a study during the third week of July to try to determine whether helmets will help protect girls from concussions caused by stick-to-head contact, and if so, what type.

"Right now, there is no standard for head protection in the women's game," said Ann Kitt Carpenetti, the managing director of game administration for US Lacrosse, the sport's governing body. "There is an allowance in our rules for soft headgear, but no testing has been done and little or no research."

The issue of requiring helmets in girl's lacrosse, at the high school and college levels, remains a hot-button issue. Many of the players and coaches fear that mandatory helmet use, especially of the hard-shell variety, would make their sport too physical and more like the boys game. But some in the medical profession are fearful of the danger of concussions and are in favor of required helmet use.

Females use more 'finesse'

"The girls' sport was meant to be a finesse sport, an athletic sport, and not a power sport or a brute-force sport," said Shoreham-Wading River coach Mary Ann Bergmann. "US Lacrosse and the referees' associations need to come together and figure out what's best for the sport."

Long Island, which has about 2,000 girls playing lacrosse on 104 high school teams, was the focus of the debate last spring, when Alexandra Fehmel, a star player on Bergmann's team, began playing with a soft helmet designed by a family friend. Before wearing the soft helmet, Fehmel had suffered two concussions playing lacrosse.

Fehmel, whose team won the Class C state championship in June, said wearing the soft helmet "has definitely helped me with my confidence. It protects me from stick-to-head injuries and any concussion I might get from that. I'm not scared to go to goal anymore. I'm not afraid to be aggressive."

Could the results of this summer's testing be the first step toward requiring helmets?

"I would not say that helmet use is inevitable. I would say that what's inevitable is that there will be a standard, hopefully by next year," said Carpenetti.

She said that US Lacrosse, in conjunction with the National Operating Committee on Standards for Athletic Equipment, which established national standards for football and baseball helmets, has funded the research project at Brown.

Project director Joseph "Trey" Crisco, a professor of orthopedics at Brown, said his study's goal "is to try to understand what head accelerations girls receive during games. How hard is the head being impacted by ball or stick?"

He said he had hoped to use sensors to measure that impact, but there was no place to effectively attach the sensors on players' heads.

"So we decided to use dummies, like they use in car crash simulations," Crisco said. "We have a model and we will have girls lacrosse players from the [Rhode Island] area come into our lab and whack away from different angles. They'll be whacking on the top of the 'head' and the side of the 'head.' They'll use the tip, the shaft and the middle of the stick so we can determine the severity of stick checks."

Crisco noted that the head forms are gender-neutral, "but they do have sizes, and we're using the smaller size."

Crisco said that once the data is compiled, "it will help US Lacrosse determine the type of helmets or whether there is even a need for them."

Crisco said results will require four to six weeks to be analyzed, and he estimates it will take several months before the report is ready.

One player's decision

For Fehmel, the question of requiring helmets has already been answered. She said she favors requiring soft helmets but not hard ones.

"Hard helmets would hurt players even more, just from bumping into each other," she said.

Bergmann, who currently is playing lacrosse in Europe where no headgear is worn, said she isn't sure where she stands on the issue of helmets.

"If you give everyone helmets, is the game going to become more aggressive?" she asked. "That's why I'm still in between."

Dr. Karl Friedman, Nassau County's supervising physician for football and lacrosse championships, is not a helmet advocate. "We don't need the helmet," he said. "We don't want to change the game. . . . The more equipment you put on them, the more you can let them play because now the safety is covered by the equipment. Absolutely they'll be more careless with their sticks . They'll be more fearless and the referees will loosen up."

Getting a second opinion

However, there are those in the medical community who feel strongly that hard-shell, boys-style lacrosse helmets are not only essential in the girls' game, but inevitable.

"When rules for girls lacrosse were written, they were written to keep the ball and stick out of the sphere of the head," said Dr. Jack Marzec, team physician for West Islip and East Islip high schools and consulting orthopedic physician for the Long Island Lizards professional men's lacrosse team.

"Girls are getting quicker, stronger, more aggressive," he added. "They're looking for scholarships and they want to win, just like the boys. I am adamant that hard helmets must be instituted in girls lacrosse because it's impossible to keep the stick and ball off the head."

Nationally known concussion expert Dr. Micky Collins, of the University of Pittsburgh Medical Center, said he can't make up his mind whether requiring female players to wear helmets is a good idea.

"I'm sitting on the fence," he said. "We know girls are more at risk for concussions. . . . There are a lot of issues on the table here. The only way to answer these questions is to do the research and find out, scientifically, where we're at. There is no good science leading us right now."

Originally published in Newsday
by Bob Herzog
with Stephen Haynes and James Crepea

RULES FOR GIRLS

Players must wear a mouthpiece and protective goggles. They may wear a soft padded helmet but not hard-shell headgear.

Checking is permitted on the head of the lacrosse stick only.

No deep pocket in the stick is allowed. No mesh pockets.

Length of stick is the same for all field players (typically 42 inches).

Played with 12 members on each team: a goalie, five defensive players and six attack players.

At least five players must remain on the defensive side of the field and four on the offensive side at all times.

Shooting is permitted only when pathway to goal is clear.

Defenders cannot block an attacker's pathway to shoot on goal unless they are within one stick-length of the attacker.

Cannot shoot a loose, uncontrolled ball; cannot hit another player with the ball; cannot hit the goalie in the head with the ball.

RULES FOR BOYS

Players must wear a hard-shell helmet with face guard.

Stick-to-body contact is integral to the game.

Checking is permitted anywhere on the stick.

Pockets in sticks are allowed because of the checking.

The length of the stick is different for different positions.

Played with 10 members on each team: a goalie, three defenders, three midfielders and three attackmen.

At least four players must remain on the defensive side of the field and three on the offensive side at all times.

Players may shoot at anytime.

Students demand entrepreneurship training

Clyde Briant, professor of engineering and vice president for research, was in Washington, D.C., on July 11 for a media roundtable hosted by The Science Coalition. Innovation and entrepreneurship was a hot topic. Below is an excerpt from Briant’s answer to the question, “Are we as a nation doing enough as a nation to inspire, prepare and develop the next generation of innovators?” An MP3 recording of the session is available online.

At Brown we have the famous open curriculum – it’s still called the new curriculum even though it started in 1969 – where the students have a tremendous amount of freedom in building up what they are going to take. We attract a cohort of entrepreneurial students. We do have an entrepreneurship program. It’s a student-led organization that’s extremely active, and one I’ve worked with in various ways through the years. I’d guess it’s about eight or nine years ago, really out of student demand, [that] we started a new major — a concentration as we call it — called Commerce, Organizations and Entrepreneurship. We don’t have a business school, but we pulled together engineering, sociology, and economics to launch this new undergraduate concentration. It certainly is one of the biggest concentrations now in a very short time because students feel that they do get experiential learning, they do get a chance to prepare themselves for a career in entrepreneurship. It’s been an extremely successful program for us.