Lifeboat Foundation: Safeguarding Humanity
Toggle light / dark theme

Blog – Page 395

Particles called neutrons are typically very content inside atoms. They stick around for billions of years and longer inside some of the atoms that make up matter in our universe. But when neutrons are free and floating alone outside of an atom, they start to decay into protons and other particles. Their lifetime is short, lasting only about 15 minutes.

Physicists have spent decades trying to measure the precise lifetime of a neutron using two techniques, one involving bottles and the other beams. But the results from the two methods have not matched: they differ by about 9 seconds, which is significant for a particle that only lives about 15 minutes.

Now, in a new study published in the journal Physical Review Letters, a team of scientists has made the most precise measurement yet of a neutron’s lifetime using the bottle technique. The experiment, known as UCNtau (for Ultra Cold Neutrons tau, where tau refers to the neutron lifetime), has revealed that the neutron lives 14.629 minutes with an uncertainty of 0.005 minutes. This is a factor of two more precise than previous measurements made using either of the methods. While the results do not solve the mystery of why the bottle and beam methods disagree, they bring scientists closer to an answer.

Read more | >

A team of planetary scientists and oceanographers from NOAA, the Indian National Center for Ocean Information Services, and the University of Zagreb, has found an example of an exception to Ekman’s theory of wind-driven ocean currents—wind and surface flow in the Bay of Bengal.

In their paper published in the journal Science Advances, the group analyzed several years of data sent by a buoy in the Indian Ocean, off the eastern coast of India.

In 1905, a Swedish oceanographer named Vagn Walfrid Ekman found evidence showing that ocean currents that flow near the surface, which were known to be impacted by , were found to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. Work since that time has backed up the theory, which has come to be known as Ekman’s theory of wind-driven ocean currents.

Read more | >

For the first time, scientists have invented a liquid ink that doctors can print onto a patient’s scalp to measure brain activity. The technology, presented December 2 in the journal Cell Biomaterials, offers a promising alternative to the cumbersome process currently used for monitoring brainwaves and diagnosing neurological conditions. It also has the potential to enhance non-invasive brain-computer interface applications.

“Our innovations in sensor design, biocompatible ink, and high-speed printing pave the way for future on-body manufacturing of electronic tattoo sensors, with broad applications both within and beyond ,” says Nanshu Lu, the paper’s co-corresponding author at the University of Texas at Austin.

Electroencephalography (EEG) is an important tool for diagnosing a variety of neurological conditions, including seizures, , epilepsy, and brain injuries. During a traditional EEG test, technicians measure the patient’s scalp with rulers and pencils, marking over a dozen spots where they will glue on electrodes, which are connected to a data-collection machine via long wires to monitor the patient’s brain activity. This setup is time consuming and cumbersome, and it can be uncomfortable for many patients, who must sit through the EEG test for hours.

Read more | >

In recent years, quantum physicists and engineers have been trying to develop quantum computer processors that perform better than classical computers on some tasks. Yet conclusive demonstrations proving that quantum systems perform better than their classical counterparts (i.e., realizations of a quantum advantage) remain scarce, due to various experimental challenges.

Researchers at Henan Key Laboratory of Quantum Information and Cryptography and the S. N. Bose National Center for Basic Sciences carried out an experiment aimed at establishing the of an elementary quantum system for .

Their paper, published in Physical Review Letters, demonstrates that a single qubit can outperform a classical bit in a communication task that does not involve any shared randomness (i.e., classically correlated random variables between communicating parties).

Read more | >

A team of researchers has uncovered a previously unknown phenomenon that could improve the way we design materials at the molecular level. By unlocking a transformation between two types of structural defects on the surface of liquid droplets, the research opens new possibilities for controlling molecular patterns with unprecedented precision. This discovery has broad applications across a range of technologies, including vaccine design, the creation of self-assembling structures, and the synthesis of complex nanoparticles.

When guest molecules are positioned on liquid droplet surfaces, they typically spread out quickly due to diffusion, making it challenging to achieve over their placement. However, the researchers discovered that droplets made from certain materials undergo a process known as “interfacial freezing,” in which the droplet’s surface forms a crystalline molecular monolayer while the bulk of the droplet remains liquid.

This process leads to a with a hexagonal surface structure, where the curvature of the surface dictates the formation of structural defects. The defects thus formed are critical to controlling the behavior of guest molecules.

Read more | >

Scientists at the U.S. Department of Energy’s (DOE) Brookhaven National Laboratory and collaborators have a new way to use data from high-energy particle smashups to peer inside protons. Their approach uses quantum information science to map out how particle tracks streaming from electron-proton collisions are influenced by quantum entanglement inside the proton.

The results reveal that and gluons, the fundamental building blocks that make up a proton’s structure, are subject to so-called . This quirky phenomenon, famously described by Albert Einstein as “spooky action at a distance,” holds that particles can know one another’s state—for example, their spin direction—even when they are separated by a great distance.

In this case, entanglement occurs over incredibly short distances—less than one quadrillionth of a meter inside individual —and the sharing of information extends over the entire group of quarks and gluons in that proton.

Read more | >