Aurelia Butler

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  • 138 Shares99 Views

    in Computers Math

    Power of rhythm as a design element in evolution and robotics

    As the internet quickly fills with viral videos of futuristic robots darting and racing around like the animals they’re built to mimic, Duke researchers say that there’s an element of their movement’s programming that should not be overlooked: rhythm.
    When analyzing legs, wings and fins for moving robots or animals in the real world, the mathematics looks fairly straightforward. Limbs with multiple sections of various lengths create different ratios for leverage, bodies with alternate shapes and sizes create drag coefficients and centers of mass, and feet, wings or fins of various shapes and sizes push on the world around them.
    All of these options create more degrees of freedom in the final design. But until now, say the researchers, nobody was paying much attention to the timing of how they’re all working together.
    “Minimizing the amount of work being done by varying the speed over the mover is an idea that’s been around a long time,” said Adrian Bejan, the J.A. Jones Distinguished Professor of Mechanical Engineering at Duke. “But varying the rhythm of that movement — the music of how the pieces move together over time — is a design aspect that has been overlooked, even though it can improve performance.”
    The reasoning and mathematics exploring this thesis was published in a paper online August 28 in the journal Scientific Reports.
    To illustrate his point in the paper, Bejan points to natural swimmers such as frogs or humans doing the breaststroke. Their swim gate is characterized by three time-intervals: a slow period of reaching forward, a fast period of pushing backward and a static period of coasting. For optimum performance, the lengths of time for those intervals typically go long, fast, long. But in certain situations — outracing or outmaneuvering a predator, for example — the ratios of those periods change drastically.
    In the design of robots built to emulate dogs, fish or birds, incorporating different rhythms into their standard cruising movements can make their normal operations more efficient. And those optimal rhythms will, in turn, affect the choices made for all of the other pieces of the overall design.
    The work builds on research Bejan published nearly 20 years ago, where he demonstrated that size and speed go hand-in-hand across the entire animal kingdom whether on land, in the air or under water. The physics underlying that work dealt with weight falling forward from a given animal’s height over and over again. In this paper, Bejan shows that his previous work was incomplete, and that all animals, robots and other moving things can further optimize their mechanics by adding an element of rhythm.
    “You can — and indeed you should — teach rhythms of movements to competitive swimmers and runners looking for an edge,” Bejan said. “Rhythm increases the number of knobs you can turn when trying to move through the world. It is yet another example of how good design — whether made by humans or through natural evolution — is truly a form of art.” More

  • 113 Shares179 Views

    in Computers Math

    Human disease simulator lets scientists choose their own adventure

    Imagine a device smaller than a toddler’s shoebox that can simulate any human disease in multiple organs or test new drugs without ever entering — or harming — the body.
    Scientists at Northwestern University have developed this new technology — called Lattice — to study interactions between up to eight unique organ tissue cultures (cells from a human organ) for extended periods of time to replicate how actual organs will respond. It is a major advancement from current in vitro systems, which can only study two cell cultures simultaneously.
    The goal is to simulate what happens inside the body to analyze, for example, how obesity might affect a particular disease; how women metabolize drugs differently than men; or what might be initially driving a disease that eventually impacts multiple organs.
    “When something’s happening in the body, we don’t know exactly who’s talking to whom,” said lead scientist Julie Kim, professor of obstetrics and gynecology at Northwestern University Feinberg School of Medicine. “Currently, scientists use dishes that have one or two cell types, and then do in-depth research and analysis, but Lattice provides a huge advancement. This platform is much better suited to mimic what’s happening in the body, because it can simulate so many organs at once.”
    A study detailing the new technology will be published Oct. 3 in the journal Lab on a Chip.
    Choose-your-own-adventure disease simulator
    The microfluidic device has a series of channels and pumps that cause media (simulated blood) to flow between the eight wells. A computer connected to Lattice precisely controls how much media flows through each well, where it flows and when. Depending on which disease or drug the scientist wants to test, they can fill each well with a different organ tissue, hormone, disease or medication. More

  • 125 Shares199 Views

    in Computers Math

    Instant evolution: AI designs new robot from scratch in seconds

    A team led by Northwestern University researchers has developed the first artificial intelligence (AI) to date that can intelligently design robots from scratch.
    To test the new AI, the researchers gave the system a simple prompt: Design a robot that can walk across a flat surface. While it took nature billions of years to evolve the first walking species, the new algorithm compressed evolution to lightning speed — designing a successfully walking robot in mere seconds.
    But the AI program is not just fast. It also runs on a lightweight personal computer and designs wholly novel structures from scratch. This stands in sharp contrast to other AI systems, which often require energy-hungry supercomputers and colossally large datasets. And even after crunching all that data, those systems are tethered to the constraints of human creativity — only mimicking humans’ past works without an ability to generate new ideas.
    The study will be published on Oct. 3 in the Proceedings of the National Academy of Sciences.
    “We discovered a very fast AI-driven design algorithm that bypasses the traffic jams of evolution, without falling back on the bias of human designers,” said Northwestern’s Sam Kriegman, who led the work. “We told the AI that we wanted a robot that could walk across land. Then we simply pressed a button and presto! It generated a blueprint for a robot in the blink of an eye that looks nothing like any animal that has ever walked the earth. I call this process ‘instant evolution.'”
    Kriegman is an assistant professor of computer science, mechanical engineering and chemical and biological engineering at Northwestern’s McCormick School of Engineering, where he is a member of the Center for Robotics and Biosystems. David Matthews, a scientist in Kriegman’s laboratory, is the paper’s first author. Kriegman and Matthews worked closely with co-authors Andrew Spielberg and Daniela Rus (Massachusetts Institute of Technology) and Josh Bongard (University of Vermont) for several years before their breakthrough discovery.
    From xenobots to new organisms
    In early 2020, Kriegman garnered widespread media attention for developing xenobots, the first living robots made entirely from biological cells. Now, Kriegman and his team view their new AI as the next advance in their quest to explore the potential of artificial life. The robot itself is unassuming — small, squishy and misshapen. And, for now, it is made of inorganic materials. But Kriegman says it represents the first step in a new era of AI-designed tools that, like animals, can act directly on the world. More

  • 138 Shares119 Views

    in Computers Math

    Electronic sensor the size of a single molecule a potential game-changer

    Australian researchers have developed a molecular-sized, more efficient version of a widely used electronic sensor, in a breakthrough that could bring widespread benefits.
    Piezoresistors are commonly used to detect vibrations in electronics and automobiles, such as in smart phones for counting steps, and for airbag deployment in cars. They are also used in medical devices such as implantable pressure sensors, as well as in aviation and space travel.
    In a nationwide initiative, researchers led by Dr Nadim Darwish from Curtin University, Professor Jeffrey Reimers from the University of Technology Sydney, Associate Professor Daniel Kosov from James Cook University, and Dr Thomas Fallon from the University of Newcastle, have developed a piezoresistor that is about 500,000 times smaller than the width of a human hair.
    Dr Darwish said they had developed a more sensitive, miniaturised type of this key electronic component, which transforms force or pressure to an electrical signal and is used in many everyday applications.
    “Because of its size and chemical nature, this new type of piezoresistor will open up a whole new realm of opportunities for chemical and biosensors, human-machine interfaces, and health monitoring devices,” Dr Darwish said.
    “As they are molecular-based, our new sensors can be used to detect other chemicals or biomolecules like proteins and enzymes, which could be game-changing for detecting diseases.”
    Dr Fallon said the new piezoresistor was made from a single bullvalene molecule that when mechanically strained reacts to form a new molecule of different shape, altering electricity flow by changing resistance. More

  • 150 Shares199 Views

    in Heart

    In noisy environs, pied tamarins are using smell more often to communicate

    Native to the Brazilian Amazon, pied tamarins have always used vocal calls to communicate. But noise pollution from car traffic and other human activity are forcing some tamarins to complement those voice calls with smell markings to alert others to dangers, researchers report September 20 in Ethology Ecology & Evolution.

    Most pied tamarins (Saguinus bicolor) live in Manaus, Brazil, inhabiting fragmented patches of forest scattered around urban environments. According to the International Union for Conservation of Nature, this small, black and whitish-yellow primate is critically endangered.

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    Vocal communication is crucial for pied tamarins’ survival; they use it to alert other individuals to danger — an important feat considering the urban environment surrounding them. “Pied tamarins have 12 different types of vocalization with several uses, from pointing to food and cuddling each other to calling out for some danger,” says Tainara Sobroza, a biologist at the Federal University of Amazonas in Manaus.

    The “danger” vocalization is particularly important for these animals, Sobroza says, as many are hit by cars and killed when they cross streets to move between forest patches. “We wanted to understand if this type of vocalization is being affected by the noise of urban environments,” she says.

    Sobroza and colleagues spent about a year observing pied tamarins, which normally wander in groups of less than 10 individuals. Using radio collars, the team tracked nine groups in Manaus for 10 days each from November 2018 to December 2019. While physically following the groups, the researchers measured the loudness of the alpha female’s alert call and visually counted how often individuals rubbed their chest and lower parts on the ground and trees, spreading an odorous, waxy substance to signal which direction they were heading.

    The team thought the tamarins would use fewer vocal callings and more smell-spreading to communicate effectively between groups — but that is not what happened. Estimates of the behaviors suggest tamarins complemented one with the other: They maintained the loudness and quantity of their vocal calls while also marking the terrain with their scents.

    “It is just like being at a noisy party, and you want to call a friend that can’t hear you from the other side of the room,” Sobroza says. “Added to calling him or her, you also usually wave and do arm gestures to call the attention of that person.”

    The new observations bring extra knowledge about the ecology and behavior of this species, says Luciane Lopes de Souza, a biologist at the University of the State of Amazonas in Manaus who did not take part in the study. “It is very interesting to see that pied tamarins can adapt to use [a scent-marking] form of communication, which we see much more frequently in other species such as the squirrel monkey.”

    Human activity is changing the behavior of several species such as birds, spiders and crabs (SN: 6/26/16, SN: 7/16/03). Understanding these changes is crucial if humans want to mitigate their impacts through conservation.

    “I do hope this study goes on, as it is of extreme importance we have research like this running for longer periods,” Souza says. “This way, we can understand annual or seasonal changes in animal behavior and think of evolutionary changes they might be facing.” More

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    in Computers Math

    Examining the superconducting diode effect

    A collaboration of FLEET researchers from the University of Wollongong and Monash University have reviewed the superconducting diode effect, one of the most fascinating phenomena recently discovered in quantum condensed-matter physics.
    A superconducting diode enables dissipationless supercurrent to flow in only one direction, and provides new functionalities for superconducting circuits.
    This non-dissipative circuit element is key to future ultra-low energy superconducting and semiconducting-superconducting hybrid quantum devices, with potential for quantum technologies in both classical and quantum computing.
    SUPERCONDUCTORS AND DIODE EFFECTS
    A superconductor is characterized by zero resistivity and perfect diamagnetic behavior, which leads to dissipationless transport and magnetic levitation.
    ‘Conventional’ superconductors and the underlying phenomenon of low-temperature superconductivity are explained well by microscopic Bardeen-Cooper-Schrieffer (BCS) theory proposed in 1957.
    The prediction of Fulde-Ferrell-Larkin-Ovchinnikov ferromagnetic superconducting phase in 1964-65 and the discovery of ‘high-temperature’ superconductivity in antiferromagnetic structures in 1986-87, has set the stage for the field of unconventional superconductivity wherein superconducting order can be stabilized in functional materials such as magnetic superconductors, ferroelectric superconductors, and helical or chiral topological superconductors. More

  • 125 Shares179 Views

    in Computers Math

    New internet addiction spectrum: Where are you on the scale?

    Young people (24 years and younger) spend an average of six hours a day online, primarily using their smartphones, according to research from the University of Surrey. Older people (those 24 years and older) spend 4.6 hours online.
    Surrey’s study, which involved 796 participants, introduces a new internet addiction spectrum, categorising internet users into five groups: Casual Users (14.86%): This group mainly goes online for specific tasks and logs off without lingering. They show no signs of addiction and are generally older, with an average age of 33.4 years. They are the least interested in exploring new apps. Initial Users (22.86%): These individuals often find themselves online longer than they initially planned and are somewhat neglectful of household chores but don’t consider themselves addicted. They are moderately interested in apps and have an average age of 26.1 years. Experimenters (21.98%): This group feels uneasy or anxious when not connected to the internet. Once they go online, they feel better. Experimenters are more willing to try out new apps and technology, and their average age is between 22.8 and 24.3 years. Addicts-in-Denial (17.96%): These users display addictive behaviours like forming new relationships online and neglecting real-world responsibilities to be online. However, they won’t admit to feeling uneasy when they’re not connected. They are also quite confident in using mobile technology. Addicts (22.36%): This group openly acknowledges their internet addiction and recognises its negative impact on their lives. They are the most confident in using new apps and technology. Their time online is significantly greater than that of the Casual Users. More

  • 113 Shares139 Views

    in Computers Math

    Engineering study employs deep learning to explain extreme events

    Identifying the underlying cause of extreme events such as floods, heavy downpours or tornados is immensely difficult and can take a concerted effort by scientists over several decades to arrive at feasible physical explanations.
    Extreme events cause significant deviation from expected behavior and can dictate the overall outcome for a number of scientific problems and practical situations. For example, practical scenarios where a fundamental understanding of extreme events can be of vital importance include rogue waves in the ocean that could endanger ships and offshore structures or increasingly frequent “1,000-year rains,” such as the life-threatening deluge in April that deposited 20 inches of rainfall within a seven-hour period in the Fort Lauderdale area.
    At the core of uncovering such extreme events is the physics of fluids — specifically turbulent flows, which exhibit a wide range of interesting behavior in time and space. In fluid dynamics, a turbulent flow refers to an irregular flow whereby eddies, swirls and flow instabilities occur. Because of the random nature and irregularity of turbulent streams, they are notoriously difficult to understand or to apply order through equations.
    Researchers from Florida Atlantic University’s College of Engineering and Computer Science leveraged a computer-vision deep learning technique and adapted it for nonlinear analysis of extreme events in wall-bounded turbulent flows, which are pervasive in numerous physics and engineering applications and impact wind and hydrokinetic energy, among others.
    The study focused on recognizing and regulating organized structures within wall-bounded turbulent flows using a variety of machine learning techniques to overcome the non-linear nature of this phenomenon.
    Results, published in the journal Physical Review Fluids, demonstrate that the technique the researchers employed can be invaluable for accurately identifying the sources of extreme events in a completely data-driven manner. The framework they formulated is sufficiently general to be extendable to other scientific domains, where the underlying spatial dynamics governing the evolution of critical phenomena may not be known beforehand.
    Using a neural network architecture called Convolutional Neural Network (CNN) that specializes in uncovering spatial relationships, researchers trained a network to estimate the relative intensity of ejection structures within turbulent flow simulation without any a-priori knowledge of the underlying flow dynamics. More