Circa 2006
Aiming to create a miniature motor capable of 1 million revolutions per minute, electronics researchers at ETH Life in Zurich are half-way to their goal.
The gas turbine-powered device produces force equivalent to 100 watts and is 95 percent fuel efficient, and gets 10 hours of operation out of the tank.
In December 2019, Donald Trump signed the U.S. Space Force Act, peeling off an orbit-and-beyond branch of the military, much as the Air Force grew out of the Army in the 1940s.
For now, the Space Force still resides within the Air Force, but nearly 90 of this year’s approximately 1000 Air Force Academy graduates became the first officers commissioned straight into the new organization. Some of those graduates were members of an academy group called the Institute for Applied Space Policy and Strategy (IASPS). Featuring weekly speakers and formalized research projects the students hope to turn into peer-reviewed papers, the group aims to game out the policies and philosophies that could guide military space activity when they are old enough to be in charge. In particular, these young cadets are interested in whether the Space Force might someday have a military presence on the Moon, and how it might work with civilians.
That activity could put the Space Force in conflict with scientists, who typically view the cosmos as a peaceful place for inquiry. But part of the club’s mission is speculating about that interplay—between the military and civilian scientists, civil space agencies, and private companies. Cadet J. P. Byrne, who will graduate in 2021, is the group’s current president. He chatted with ScienceInsider about the institute’s work. This interview has been edited for length and clarity.
Continue reading “U.S. Air Force cadets study idea of Space Force bases on the Moon” »
Swarm intelligence (SI) is concerned with the collective behaviour that emerges from decentralised self-organising systems, whilst swarm robotics (SR) is an approach to the self-coordination of large numbers of simple robots which emerged as the application of SI to multi-robot systems. Given the increasing severity and frequency of occurrence of wildfires and the hazardous nature of fighting their propagation, the use of disposable inexpensive robots in place of humans is of special interest. This paper demonstrates the feasibility and potential of employing SR to fight fires autonomously, with a focus on the self-coordination mechanisms for the desired firefighting behaviour to emerge. Thus, an efficient physics-based model of fire propagation and a self-organisation algorithm for swarms of firefighting drones are developed and coupled, with the collaborative behaviour based on a particle swarm algorithm adapted to individuals operating within physical dynamic environments of high severity and frequency of change. Numerical experiments demonstrate that the proposed self-organising system is effective, scalable and fault-tolerant, comprising a promising approach to dealing with the suppression of wildfires – one of the world’s most pressing challenges of our time.
Graphene and other carbon materials are known to change their structure and even self-heal defects, but the processes involved in these atomic rearrangements often have high energy barriers and so shouldn’t occur under normal conditions. An international team of researchers in Korea, the UK, Japan, the US and France has now cleared up the mystery by showing that fast-moving carbon atoms catalyse many of the restructuring processes.
Graphene – a carbon sheet just one atomic layer thick – is an ideal system for studying defects because of its simple two-dimensional single-element structure. Until now, researchers typically explained the structural evolution of graphene defects via a mechanism known as a Stone-Thrower-Wales type bond rotation. This mechanism involves a change in the connectivity of atoms within the lattice, but it has a relatively large activation energy, making it “forbidden” without some form of assistance.
Using some of the best transmission electron microscopes available, researchers led by Alex Robertson of Oxford University and Kazu Suenaga of AIST Tsukuba found that so-called “mediator atoms” – carbon atoms that do not fit properly into the graphene lattice – act as catalysts to help bonds break and form. “The importance of these rapid, unseen ‘helpers’ has been previously underestimated because they move so fast and have been next-to-impossible to observe,” says co-team leader Christopher Ewels, a nanoscientist at the University of Nantes.
Imagine tiny crystals that “blink” like fireflies and can convert carbon dioxide, a key cause of climate change, into fuels.
A Rutgers-led team has created ultra-small titanium dioxide crystals that exhibit unusual “blinking” behavior and may help to produce methane and other fuels, according to a study in the journal Angewandte Chemie. The crystals, also known as nanoparticles, stay charged for a long time and could benefit efforts to develop quantum computers.
“Our findings are quite important and intriguing in a number of ways, and more research is needed to understand how these exotic crystals work and to fulfill their potential,” said senior author Tewodros (Teddy) Asefa, a professor in the Department of Chemistry and Chemical Biology in the School of Arts and Sciences at Rutgers University-New Brunswick. He’s also a professor in the Department of Chemical and Biochemical Engineering in the School of Engineering.
Circa 2015
A nighttime shot shows some of the antennas of the Owens Valley Long Wavelength Array in California, with the center of our galaxy in the background. (Credit: Gregg Hallinan)
Continue reading “New radio telescope scans entire sky instantly” »
Victims included Democratic presidential candidate Joe Biden, former President Barack Obama and Tesla CEO Elon Musk. Accounts for those people, and others, posted tweets asking followers to send bitcoin to a specific anonymous address.
For their efforts, the scammers received over 400 payments in bitcoin, with a total value of $121,000 at Thursday’s exchange rate, according to an analysis of the Bitcoin blockchain performed by Elliptic, a cryptocurrency compliance firm.
Elliptic co-founder Tom Robinson said it’s a low sum for what appears to be a historic hack that Twitter said involved an insider.
According to Forbes, payroll costs consume up to 25 per cent of a restaurant’s profit. Restaurateurs in Sydney and other parts of Australia hope to combat that expense by following in the footsteps of venues in Asia that have used drone waiters instead of human wait staff.
Faster and Human-Free Waiter drones are robotic devices that soar through the air with platters of food and glasses of beverages perched on top. Customers place their orders via electronic devices or other means, then the kitchen sends out their food on trays carried by machines rather than humans. Each drone can carry up to 4.4 pounds of cargo.
Sensors on the sides of the drones prevent them from crashing into objects or people as they navigate busy restaurants. While this strategy eliminates the human element that many experts believe is essential to the hospitality industry, the waiter drones’ success in Asia suggests they might prove a valuable contribution to restaurants in Australia.
In the movie “Ant-Man,” the title character can shrink in size and travel by soaring on the back of an insect. Now researchers at the University of Washington have developed a tiny wireless steerable camera that can also ride aboard an insect, giving everyone a chance to see an Ant-Man view of the world.
The camera, which streams video to a smartphone at 1 to 5 frames per second, sits on a mechanical arm that can pivot 60 degrees. This allows a viewer to capture a high-resolution, panoramic shot or track a moving object while expending a minimal amount of energy. To demonstrate the versatility of this system, which weighs about 250 milligrams—about one-tenth the weight of a playing card—the team mounted it on top of live beetles and insect-sized robots.
The results will be published July 15 in Science Robotics.
Work from home caused by the coronavirus pandemic has accelerated conversations about zero-trust, several IT officials have said recently.
