Experimental, simulation results reveal how coaxial, co-rotating rotors may lead to a quieter hover — ScienceDaily

Imagine a silent helicopter stealthily moving troops and supplies around a future battlefield. U.S. Army researchers look to helicopter noise reduction technology as a top priority in aircraft design.

At the U.S. Army Combat Capabilities Development Command, now known as DEVCOM, Army Research Laboratory, researchers collaborated with Uber and the University of Texas at Austin to investigate the acoustic properties of electric vertical takeoff and landing aircraft, which use distributed electric propulsion to power flight.

These eVTOL vehicles may aid the Army with important tasks such as aerial surveillance and cargo transport; however, they feature smaller rotors than traditional helicopters. As a result, eVTOL rotors may emit a different sound signature that researchers will have to take into consideration.

“The noise you hear from these smaller rotors is generated through fundamentally different physical mechanisms,” said Dr. George Jacobellis, Army research engineer at the laboratory’s Vehicle Technology Directorate. “Traditional modeling techniques

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Experimental evolution reveals how bacteria gain drug resistance — ScienceDaily

A research team at the RIKEN Center for Biosystems Dynamics Research (BDR) in Japan has succeeded in experimentally evolving the common bacteria Escherichia coli under pressure from a large number of individual antibiotics. In doing so, they were able to identify the mechanisms and constraints underlying evolved drug resistance. Their findings, published in the scientific journal Nature Communications, can be used to help develop drug-treatment strategies that minimize the chance that bacteria will develop resistance.

Counteracting multidrug-resistant bacteria is becoming a critical global challenge. It seems that every time we develop new antibiotics, novel antibiotic-resistant bacteria emerge during clinical use. To win this cat-and-mouse game, we must understand how drug resistance evolves in bacteria. Naturally, this process is very complicated, involving numerous changes in genome sequences and cellular states. Therefore, a comprehensive study of resistance dynamics for large numbers of antibiotics has never been reported.

“Laboratory evolution combined with

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Facebook launches experimental new app E.gg for personalized webpages

  • Facebook has a new app called E.gg that allows users to create personalized websites. 
  • E.gg is described as a “digital zine creator,” and was introduced with a similarly ancient reference: websites circa 1999.
  • It’s goal is broad: to “give creative control back to people” and to “create a low-pressure space for the really unpolished and mismatched things” that the early days of the internet embodied.
  • E.gg is free and available now on Apple’s iPhone and iPad.
  • Visit Business Insider’s homepage for more stories.

Facebook’s experimental software division is back with another new app: E.gg, which it describes as a “digital zine creator.”

In practice, the app enables users to create shareable websites that look like a mixture between a high school locker circa 1995 and a Tumblr page circa 2015 — what Facebook describes as “free-form mixed media collages.”

These collages are then given shareable URLs, just like normal websites,

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Coral Reproduction Being Disrupted By Experimental Ship Fuel Leaked In Mauritius

As controversy continues to surround the experimental ship oil that was spilled across 125 square kilometers of Mauritius’ coral lagoons this August, new evidence is emerging of the long term impacts from this oil.

There are fears that this type of oil could cause irreversible damage to Mauritius delicate coral reefs, critical for most of the island’s biodiversity, artisanal fishing communities, tourism as well as coastal

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The experimental demonstration of entanglement between mechanical and spin systems

The experimental demonstration of entanglement between mechanical and spin systems
Image illustrating the experiment carried out by the researchers. Credit: Thomas et al.

Quantum entanglement is the basic phenomenon underlying the functioning of a variety of quantum systems, including quantum communication, quantum sensing and quantum computing tools. This phenomenon results from an interaction (i.e., entanglement) between particles. Attaining entanglement between distant and very different objects, however, has so far proved highly challenging.

Researchers at the University of Copenhagen have recently generated entanglement between a mechanical oscillator and a collective atomic spin oscillator. Their work, outlined in a paper published in Nature Physics, introduces a strategy for generating entanglement between these two distinct systems.

“About a decade ago, we proposed a way to generate entanglement between a mechanical oscillator and a spin oscillator via photons, using the principle that was later called ‘quantum mechanics free subspaces’ or ‘trajectories without quantum uncertainties,'” said Eugene S. Polzik, who led the group that

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