Lifeboat Foundation

I felt as though I were communing directly with a plant for the first time.

A fully-connected annealer extendable to a multi-chip system and featuring a multi-policy mechanism has been designed by Tokyo Tech researchers to solve a broad class of combinatorial optimization (CO) problems relevant to real-world scenarios quickly and efficiently. Named Amorphica, the annealer has the ability to fine-tune parameters according to a specific target CO problem and has potential applications in logistics, finance, machine learning, and so on.

The modern world has grown accustomed to an efficient delivery of goods right at our doorsteps. But did you know that realizing such an efficiency requires solving a mathematical problem, namely what is the best possible route between all the destinations? Known as the “traveling salesman problem,” this belongs to a class of mathematical problems known as “combinatorial optimization” (CO) problems.

As the number of destinations increases, the number of possible routes grows exponentially, and a brute force method based on exhaustive search for the best route becomes impractical. Instead, an approach called “annealing computation” is adopted to find the best route quickly without an exhaustive search.

To study how stars and planets are born we have to look at star cradles hidden in cool clouds of dust. Far-infrared telescopes are able to pierce through those clouds. Conventionally, niobium nitride bolometers are used as the detectors, despite their low operating temperature of 4 Kelvin (−269° Celsius).

Now Yuner Gan (SRON/RUG), together with a team of scientists at SRON, TU Delft, Chalmers University and RUG, has developed a new type of bolometer, made of magnesium diboride, with an operating temperature of 20 Kelvin or above. This can significantly reduce the cost, complexity, weight and volume of the space instruments.

Conventional, superconducting niobium nitride (NbN) hot electron bolometers (HEBs) are so far the most sensitive heterodyne detectors for high-resolution spectroscopy at far-infrared frequencies. Heterodyne detectors take advantage of a local oscillator to convert a terahertz line into a gigahertz line.

When optical beams, consisting of photons, travel through fibers, they cause vibrations that generate acoustic waves, consisting of phonons. The phenomenon, called Brillouin scattering, has been harnessed by researchers to optomechanically “couple” acoustic waves with light waves. This coupling allows information carried by photons to be transduced, or converted, to the phonons, which travel nearly a million times more slowly than light waves.

Opto-acoustic coupling has enabled researchers to read and manipulate the transduced information more easily. To date, however, many of the Brillouin scattering techniques researchers have used rely on standard fiber geometries that cause acoustic waves to die out quickly, limiting the efficacy of the coupling.

Now, using an optical fiber with a micron-sized waist, University of Rochester researchers have demonstrated how to couple propagating optical waves and long-lived acoustic waves, with strong optical-acoustic interactions.

Gas clouds in the Cygnus X Region, a region where stars form, are composed of a dense core of molecular hydrogen (H₂) and an atomic shell. These ensembles of clouds interact with each other dynamically in order to quickly form new stars. That is the result of observations conducted by an international team led by scientists at the University of Cologne’s Institute of Astrophysics and at the University of Maryland.

Until now, it was unclear how this process precisely unfolds. The Cygnus X region is a vast luminous cloud of gas and dust approximately 5,000 light years from Earth. Using observations of spectral lines of ionized carbon (CII), the scientists showed that the clouds have formed there over several million years, which is a fast process by astronomical standards. The results of the study, “Ionized carbon as a tracer for the assembly of interstellar clouds,” will appear in the next issue of Nature Astronomy.

The observations were carried out in an international project led by Dr. Nicola Schneider at the University of Cologne and Prof Alexander Tielens at the University of Maryland as part of the FEEDBACK program on board the flying observatory SOFIA (Stratospheric Observatory for Infrared Astronomy). The new findings modify previous perceptions that this specific process of star formation is quasi-static and quite slow. The dynamic formation process now observed would also explain the formation of particularly massive stars.

WASHINGTON, Feb 17 (Reuters) — U.S. diplomatic communications with China remain open after the shooting down of a Chinese spy balloon this month, but contact between the countries’ militaries “unfortunately” remains shut down, the White House said on Friday.

White House National Security Council spokesman John Kirby also said it was not the “right time” for Secretary of State Antony Blinken to travel to China after he postponed a Feb. 5–6 trip over the balloon episode, but President Joe Biden wanted to speak to Chinese President Xi Jinping when it was “appropriate.”

Kirby told a White House news briefing that U.S. and Chinese diplomats can still communicate despite tensions over the balloon incident.

https://youtube.com/watch?v=hNlgfvtS5qw

Welcome to the first issue of Rushing Robotics with brief overviews of each section.

In a stunning development, a neural network now has the intuitive skills of a 9-year-old.

The project that resulted has helped slash the district’s annual energy consumption by 1.6 million kilowatts and in three years generated enough savings to transform the district’s $250,000 budget deficit into a $1.8 million surplus.

Just as Hester envisioned at the outset, a major chunk of the money is going toward teachers’ salaries — fueling pay raises that average between $2,000 and $3,000 per educator per month.

Every morning, the Energy News Network compiles the top stories about the clean energy transition and delivers them to your inbox for free. Sign up today!

Continue reading “This Arkansas school turned solar savings into better teacher pay” »