Experts Matter. Find Yours.

Researchers work to reduce excessive noise in Florida cities

Excessive noise, or noise pollution, in cities has been linked in multiple studies to increased stress, sleep disturbances, and long-term health problems. Researchers from the University of Florida are on a mission to quiet things down, working with local governments and a private firm to improve both public health and urban living. Enter Martin Gold, an associate professor from UF’s School of Architecture, and his team of students. They recently partnered with Siebein Acoustic, a soundscape design firm that specializes in architectural and environmental acoustics. The team visited Fort Lauderdale, one of Florida’s busiest cities, known both as a party destination and a mecca for retirees. The team studied areas throughout downtown and by the beach to provide recommendations for reducing the impact of sound in the city at large. To inform their work, researchers recruited participants to walk the city and report on their observations about sound and sights, took photo documentation, acoustic measurements, geographical measurements and analyzed municipal code studies. The team proposed different improvement strategies including: Using vertical distance by requiring residential high-rise construction to limit residences in the lower floors of buildings. Limiting sound levels at windows or balconies of residential units. Building envelope systems, which are the building components that separate the indoors from the outdoors, that limit sound transmission and absorb sound. Designing new construction so buildings absorb and diffuse the sounds striking them rather than reflecting and subsequently amplifying the sounds or focusing the sounds in particular areas. Strategic zoning to incentivize designs along arterial corridors that fill the sites and provide acoustic barriers to the residential neighborhoods behind them. “We need to take a closer look at how we are designing the next generation of urban environments. There’s a lot we can do with soundscape architecture to positively impact issues moving forward.” —Martin Gold, associate professor from UF’s School of Architecture The findings and recommendations were presented at the International Congress and Exposition on Noise Control Engineering in Nantes, France. Gold and his students are currently surveying an area of Clearwater and plan to study more cities around the state and offer recommendations for reducing noise.

LSU Launches Louisiana’s Most Advanced Microscope at Research Core Facility

LSU’s Advanced Microscopy and Analytical Core (AMAC) facility gives Louisiana researchers access to 16 state-of-the-art instruments, including a new Spectra 300 Scanning Transmission Electron Microscope (S/TEM) for atomic-scale imaging and analysis. The new microscope—the most advanced in Louisiana—was installed with $10 million in support from the U.S. Army. Standing almost 13 feet tall on a platform isolated from vibration, the S/TEM required major renovations, including a raised ceiling, acoustic wall panels, and a magnetic field cancellation system to ensure the instrument’s stability and performance. The microscope offers magnification up to 10 million times, powerful enough to enlarge a single grain of Mississippi River silt to the size of Tiger Stadium. “This is a transformational moment for LSU and for the future of research in Louisiana,” Interim LSU President Matt Lee said. “With the installation of the most advanced microscope in the state, LSU is once again demonstrating how we’re delivering on our promises—leading in research, innovation, and service to the state and nation.” The launch of the AMAC and S/TEM demonstrates LSU’s increased investment in providing its faculty and partners with the best possible equipment for research and discovery, including for national defense, energy, and health. “Winning in research is no different than winning in athletics—the best facilities attract the best talent, and you need the best of both to win,” LSU Vice President of Research and Economic Development Robert Twilley said. “Today’s launch is about a state-of-the-art microscope but also the launch of the AMAC as our first research core facility at LSU—the first of more to come to attract, train, and supply the best research talent for Louisiana and build research teams that win.” Using a finely focused electron beam and techniques such as energy dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS), the S/TEM can reveal both structure and chemistry at atomic resolution. These capabilities drive advances in materials science—improving semiconductors, solar cells, batteries, catalysts, coatings, and alloys—while supporting biomedical research by mapping drug delivery, uncovering the structures of viruses and bacteria, and improving medical implant design. LSU’s AMAC research core facility was recently rebranded, changing its name from the Shared Instruments Facility (SIF). Learn more about how AMAC instruments help unlock millions in federal research funding to Louisiana and deliver solutions.

Swimming in the deep: MSU research reveals sea lamprey travel patterns in Great Lakes waterways

Why this matters: Invasive sea lampreys prey on most species of large Great Lakes fish such as lake trout, brown trout, lake sturgeon, lake whitefish, ciscoes, burbot, walleye and catfish. These species are crucial to Great Lakes ecosystems and to the region’s fishing industry. Understanding how sea lampreys migrate can inform management and conservation strategies, such as developing methods to catch the invasive fish that don’t involve dams, which reduce river connectivity, or lampricide, a pesticide that some communities and groups prefer not to use. The Great Lakes fishing industry is worth $7 billion and provides 75,000 jobs to the region. Reducing the amount of sea lamprey in waters is crucial for the industry’s well-being and the economic vitality of the Great Lakes. How do you catch an invasive fish that’s solitary, nocturnal and doesn't feed on bait? Researchers in the Michigan State University College of Agriculture and Natural Resources are one step closer to figuring it out. In a study published in the Journal of Experimental Biology and funded by the Great Lakes Fishery Commission, Kandace Griffin, a fisheries and wildlife doctoral student, and Michael Wagner, professor in the MSU Department of Fisheries and Wildlife, found that sea lampreys — a parasitic fish considered an invasive species in the Great Lakes region of the U.S. — follow a clear pattern of staying in the deepest parts of a river. These findings are important for informing sea lamprey management strategies, conservation of fish species native to the Great Lakes and protecting the region’s $7 billion fishing industry and the 75,000 jobs it provides. “We wanted to know how sea lampreys are making their movement decisions when migrating,” Griffin said. “Are they guided by certain environmental cues? Are they moving through areas that are safer? How can we potentially exploit those decisions or maybe manipulate them into going somewhere that they don’t want to go, like pushing them into a trap.” The primary methods used to control sea lamprey are dams that block them from entering waterways and lampricide, a species-specific pesticide that targets lamprey larvae. “Dams create a lot of challenges for conserving river ecosystems: They block all the other fish that are moving up and down in the system. Even though lampricide is proven to be safe and effective, there are communities that are uncomfortable with its use going into the future,” Wagner said. “Figuring out the right way to fish sea lamprey would decrease its population, lower reproduction rates and provide managers with the opportunity to match their control tactics to the community’s needs.” To track lamprey movements, Griffin and Wagner used a method called acoustic telemetry, which involved using sound emitted from a surgically implanted tag to track the movement of 56 sea lampreys in the White River near Whitehall, Michigan. Griffin likened acoustic telemetry to GPS. “There’s a tag that emits sound and has a unique transmission with a unique identification code, so I know exactly which fish is going where,” she said. “The receivers are listening for that sound and then calculating the time it reaches each receiver. We used this information to triangulate the position of the sea lamprey and analyzed it to find out how they’re using the river’s environmental traits to make decisions on where to swim.” Of the 56 lampreys studied, 26 of them (46%), consistently chose the deepest quarter of the river. “For nearly 20 years we have been discovering how sea lampreys migrate along coasts and through rivers. Now, thanks to Kandace’s work, we know where their movement paths come together near a riverbank — the perfect place to install a trap or other fishing device,” Wagner said. “That knowledge can be used to find similar sites across the Great Lakes basin.” Right now, a fishing device designed to catch bottom-swimming, solitary, nonfeeding, nocturnal sea lamprey doesn’t exist. However, Wagner notes there are places around the world — including Indigenous communities in the U.S. — where people have fished migratory lampreys of various species for hundreds of years and could help inform the creation of such a mechanism. “We have recently had a proposal funded to scour the Earth in search of knowledge, both scientific and traditional, about how to capture migrating lampreys and similar fishes,” Wagner said. “We want to talk with the communities of people who have histories fishing these animals and use this information, along with other data we’ve gathered, to conceive a device that could be used to fish sea lampreys.” Griffin views the new intel on lamprey migration patterns as a way to inform fishing practices to complement some of the existing control methods. “Hopefully, we can use this as a supplemental control method to the use of the barriers or dams,” she said. “We have societal pressure to remove barriers to enhance river connectivity, and some barriers are failing. Open water trapping is another way that we could try to still combat the invasive sea lamprey problem here but also promote river connectivity and other conservation goals for other species.” Wagner shares the same perspective. “When a community, or the Great Lakes Fishery Commission, or the governments of Canada and the U.S. come in and say, ‘We’d really rather be able to control this river with something other than lampricide,’ we want to be able to be able to provide 360-degree solutions that specify where to fish, when to fish and how to fish using fully prototyped and tested equipment,” he said. “We want our science to help solve real-world problems.”

The Sky’s the Limit: Researching surface impacts to improve the durability of aircraft

Associate professor Ibrahim Guven, Ph.D. from the Department of Mechanical and Nuclear Engineering is conducting a research project funded by the Department of Defense (DoD) that explores building aircraft for military purposes and civilian transportation that can travel more than five times the speed of sound. Guven’s role in this project is to consider the durability of aircraft surfaces against elements such as rain, ice, and debris. His research group is composed of Ph.D. students who assist with the study and has collaborated with other institutions, including the University of Minnesota, Stevens Institute of Technology and the University of Maryland. Why did you get involved with this research project? The intersection of need and our interests decides what we research. I’m interested in physics and have been working on methods to strengthen aircraft exteriors against the elements for 12 years. We started with looking at sand particle impact damage, and then we graduated from that to studying raindrop impact because that’s a more challenging problem. Sand impact is not as challenging in terms of physics. A liquid and a solid behave differently under impact conditions. The shape of the raindrop changes prior to the impact due to the shock layer ahead of the aircraft. Researching this impact requires simulating the raindrop-shock layer interaction that gives us the shape of the droplet at the time of contact with the aircraft surface. Unlike with sand, analyzing raindrop impact starts at that point, which requires accurate modeling of the pressure being applied. As the aerospace community achieves faster speeds, there’s a need to understand what will affect a flight’s safety and the aircraft’s structural integrity. That need is what I’m helping to fulfill. Were there any challenges you and your research group faced while working on this study? How did you overcome them? Finding data was hard. I’m a computational scientist, meaning I implement mathematical differential equations that govern physics to write computer code that predicts how something will behave. My experiments are virtual, so to ensure that my models work well, I need experimental data for validation. However, conducting experiments on this problem is extremely challenging. That’s the roadblock. Currently, we refer to data from the seventies and eighties. Beyond that, this kind of information is not available. We are working to generate data that my computational methods need for their validation. An example is the nylon bead impact experiment. Some researchers found that if you shoot a nylon bead at a target, it leads to damage similar to that from a raindrop of the same size. It is much easier and cheaper to shoot nylon beads compared to the experiments involving raindrops. However, this similarity vanishes as we go into higher velocities. How do you typically gather data for a project of this nature? We are working with a laboratory under the U.S. Navy. They can accelerate specimens to relevant speeds, meaning they can shoot them into the air at the desired velocity. A colleague at Stevens Institute of Technology also came up with a droplet levitator. He uses acoustic waves emitted by tiny speakers to play a certain sound at a certain frequency to create enough air pressure to suspend droplets midair. To an untrained eye, it looks like magic. They levitate droplets and use a railgun to shoot our samples at the droplets. Our samples hitting the droplets are stand-ins for the aircraft surface material. Once this is done successfully, they shoot a sample with high-speed cameras that can take ten million frames per second. As a result, we get a good, high-fidelity picture of this impact event. That is the type of data I’m seeking, and this is how I get it from my collaborators. What was your overall experience working with the students in your research group? I like to think it was positive. I try to be a nice advisor and give them space to explore, fail, and bring their own ideas. Even if I feel like we’re at a dead-end, I step back and let them figure it out. My role is to help them grow. Teach them, train them and help them along the way. That’s the experience. Did you notice any personal changes in your students during this project? Yeah, I have. When they’re just out of their undergraduate programs, confidence is lacking sometimes. You see them become more sure of themselves as they learn more and more. Often, regardless of whether English is their native language or not, writing is a big issue for every student. How one presents ideas in written form is a persistent problem in engineering. I see the most growth in that area. Again, an advisor has to be a guide and also have patience. Eventually, after working on multiple paper drafts, I can see tremendous improvement. You must allow them to see their shortcomings. It’s important to work with students to refine how they frame a problem, explain it to a wide audience in concise terms, and use neutral language without leading them to certain conclusions. Why do you think that this research is important? Somebody has to do it, right? I believe that I’m the right person because of my background. Personally, I think if this research makes for safer travel conditions, and if I have something to offer, then why not? If we can accurately simulate what happens in these conditions, we can use our methods to test out designs for damage mitigation. For example, we can perform simulations with different surface materials for the aircraft to see if using a different material or layered coating system leads to less damage. In a bigger picture, we’re working on a very narrow problem in our field, but we don’t know how useful that’s going to be in 10, 15 or 30 years from now. Whatever we study and put out there in terms of publications, it may help some other researcher in a different context many years later. This could be space research, modeling an atmosphere on a different planet, or something that is related to our bodies. There are parts of physics in this problem that do not necessarily only apply to high-speed flight. It could be many different things. One has to understand that what is studied may seem obscure today, but because the universe is more or less governed by the same physics, everything should be put in a theoretical framework, done right and shared with the community. People may learn things that could become relevant in the future. It’s not uncommon. What is another subject that you plan to study? The next natural step is coming up with strategies to mitigate damage in these scenarios. If avoiding a risk is not an option, can we actually come up with a solution? We have to determine how to modify an aircraft’s design to prevent a catastrophe. Another extension of my research would be to examine the landing of spacecraft on dusty planetary bodies. During landing on Earth, aircraft approach and reach the ground very smoothly. On the other hand, a spacecraft comes down slowly and needs a lot of reverse propulsion for a soft landing. As it does, it kicks up a large amount of dust, which blows back and hits the spacecraft. Taking into account the damage that occurs due to particle impact is a direct connection to my work. This again is an open area, and because we have ambitions to have a permanent presence on dusty places like the moon and Mars, we have to nail down the concept of landing safely. That is where my research could help.

#Expert Research: Biodegradable ultrasound implant could improve brain tumour treatments

One of the challenges in treating certain types of brain cancer is the way that the blood-brain barrier prevents chemotherapy drugs from reaching the tumors they're meant to target. UConn's Thanh Nguyen, a biomedical and mechanical engineer, is developing new technology that could improve how we are able to treat brain tumors.  He recently spoke with Physics World about this groundbreaking research: A new type of biodegradable ultrasound implant based on piezoelectric nanofibres could improve outcomes for patients with brain cancer. Researchers led by Thanh Nguyen from the the University of Connecticut’s department of mechanical engineering fabricated the devices from crystals of glycine, an amino acid found in the human body. Glycine is not only non-toxic and biodegradable, it is also highly piezoelectric, enabling the creation of a powerful ultrasound transducer that could help treat brain tumours. Brain tumours are particularly difficult to treat because the chemotherapy drugs that would be effective in tackling them are blocked from entering the brain by the blood–brain barrier (BBB). This barrier is a very tight junction of cells lining the blood vessel walls that prevents particles and large molecules from making their way through and damaging the brain. However, ultrasound can be safely used to temporarily alter the shape of the barrier cells such that chemotherapy drugs circulating in the bloodstream can pass through to the brain tissues. Currently, to achieve such BBB opening requires the use of multiple ultrasound transducers located outside the body, together with very high intensity ultrasound to enable penetration through the thick human skull bone. “That strong ultrasound can easily damage brain tissues and is not practical for multiple-time applications which are required to repeatedly deliver chemotherapeutics,” Nguyen tells Physics World. By contrast, the team’s new device would be implanted during the tumour removal surgery, and “can generate a powerful acoustic wave deep inside the brain tissues under a small supplied voltage to open the BBB”. The ultrasound would be triggered repeatedly as required to deliver the chemotherapy that kills off the residual cancer cells at tumour sites. After a set period of time following treatment the implant biodegrades, thereby eliminating the need for surgery to remove it. The research, reported in Science Advances, demonstrated that the team’s device used in conjunction with the chemotherapy drug paclitaxel significantly extended the lifetime of mice with glioblastomas (the most aggressive form of brain tumour) compared with mice receiving the drugs but no ultrasound treatment. This is fascinating research and if you are interesting in covering this topic, then let us help. Professor Nguyen focuses on biointegrated materials and devices at nano- and micro-scales for applications in biomedicine, and he's available to speak to media about his research. Simply click on his icon now to arrange an interview today.