Page 5176

Feb 13, 2021

US Testing a New $20 Million Gigantic Sea “Tank”

Posted by in categories: education, transportation

Welcome back to the Daily Aviation for a new documentary video about the DARPA/USMC Ultra Heavy-Lift Amphibious Connector (UHAC) based on the Captive Air Amphibious Transporter (CAAT) project. This video also feature the US Landing Craft Air Cushion (LCAC) and compares it to the UHAC project.

Footage credit: US marine, derivative work by the daily aviation.

Continue reading “US Testing a New $20 Million Gigantic Sea ‘Tank’” »

Feb 13, 2021

Chronic unpredictable stress induces depression-related behaviors

Posted by in categories: genetics, neuroscience

Previous studies have shown that AgRP neurons in the arcuate nucleus (ARC) respond to energy deficits and play a key role in the control of feeding behavior and metabolism. Here, we demonstrate that chronic unpredictable stress, an animal model of depression, decreases spontaneous firing rates, increases firing irregularity and alters the firing properties of AgRP neurons in both male and female mice. These changes are associated with enhanced inhibitory synaptic transmission and reduced intrinsic neuronal excitability. Chemogenetic inhibition of AgRP neurons increases susceptibility to subthreshold unpredictable stress. Conversely, chemogenetic activation of AgRP neurons completely reverses anhedonic and despair behaviors induced by chronic unpredictable stress.

Feb 13, 2021

Perseverance: Countdown to Impact

Posted by in category: space

About this partnership.

The Mars Perseverance Rover is in its final flight stages, heading for its historic rendezvous with the red planet. First up — a harrowing landing, scheduled for February 18th…Don’t miss it!

Learn more with Perseverance: Countdown to Impact now available on CuriosityStream.

Feb 12, 2021

NASA’s Mars rover is about to land in the perfect place to hunt for alien fossils: an ancient lake bed called Jezero Crater

Posted by in category: alien life

Perseverance will scour mud and clay in Jezero’s river delta and shorelines for signs of microbe communities.

Feb 12, 2021

AI Can Now Learn to Manipulate Human Behavior

Posted by in category: robotics/AI

OEC promoting AI in Africa.

Ranjan KC

Artificial intelligence (AI) is learning more about how to work with (and on) humans. A recent study has shown how AI can learn to identify vulnerabilities in human habits and behaviours and use them to influence human decision-making.

Feb 12, 2021

Plastic trash can now be recycled into ultra-strong graphene

Posted by in categories: health, materials

Plastic decomposition is sped up by the flash Joule heating method.

The smart fabric is light, breathable, and can change how first-responders deal with sarin.

Max G. Levy, Science and Health Journalism.

Feb 12, 2021

AEgIS on track to test freefall of antimatter

Posted by in category: physics

It’s a fundamental law of physics that even the most ardent science-phobe can define: matter falls down under gravity. But what about antimatter, which has the same mass but opposite electrical charge and spin? According to Einstein’s general theory of relativity, gravity should treat matter and antimatter identically. Finding even the slightest difference in their free-fall rate would therefore lead to a revolution in our understanding. While the free fall of matter has been measured with an accuracy of around one part in 100 trillion, no direct measurement for antimatter has yet been performed due to the difficulty in producing and containing large quantities of it.

Feb 12, 2021

Electric transmission operators could benefit from temperature-dependent resource adequacy modeling

Posted by in category: nuclear energy

How much does a power system’s reliability depend on the temperature? Electric power system generator resource adequacy modeling is designed to help determine capacity requirements for electric power system operators across the United States. While calculating resource adequacy requirements has been done for a century, it requires ongoing attention as the generation mix is constantly expanding and changing. A new paper contributes to these ongoing reliability considerations by using a unique data set to determine how both low and high temperatures reduce the reliability of coal, gas, diesel, hydroelectric, and nuclear power generators and thus affect the amount of generation markets should contract for.

Feb 12, 2021

The broken promise that undermines human genome research

Posted by in category: biotech/medical

Although some researchers are reluctant to share genome data, the field is generally viewed as generous compared with other disciplines. Still, the repositories meant to foster sharing often present barriers to those uploading and downloading data. Researchers tell tales of spending months or years tracking down data sets, only to find dead ends or unusable files. And journal editors and funding agencies struggle to monitor whether scientists are sticking to their agreements.

Data sharing was a core principle that led to the success of the Human Genome Project 20 years ago. Now scientists are struggling to keep information free.

Feb 12, 2021

New Machine Learning Theory Raises Questions About the Very Nature of Science

Posted by in categories: information science, physics, robotics/AI, science, space

A novel computer algorithm, or set of rules, that accurately predicts the orbits of planets in the solar system could be adapted to better predict and control the behavior of the plasma that fuels fusion facilities designed to harvest on Earth the fusion energy that powers the sun and stars.

The algorithm, devised by a scientist at the U.S. Department of Energy’s (DOE) Princeton Plasma Physics Laboratory (PPPL), applies machine learning, the form of artificial intelligence (AI) that learns from experience, to develop the predictions. “Usually in physics, you make observations, create a theory based on those observations, and then use that theory to predict new observations,” said PPPL physicist Hong Qin, author of a paper detailing the concept in Scientific Reports. “What I’m doing is replacing this process with a type of black box that can produce accurate predictions without using a traditional theory or law.”

Qin (pronounced Chin) created a computer program into which he fed data from past observations of the orbits of Mercury, Venus, Earth, Mars, Jupiter, and the dwarf planet Ceres. This program, along with an additional program known as a “serving algorithm,” then made accurate predictions of the orbits of other planets in the solar system without using Newton’s laws of motion and gravitation. “Essentially, I bypassed all the fundamental ingredients of physics. I go directly from data to data,” Qin said. “There is no law of physics in the middle.”