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כתבות אחרונות מאתר 'Phys'
Phys

Northern hemisphere snow cover is shrinking—new analysis tracks how fast‎

Faculty at Mississippi State University are continuing work at the intersection of mathematics, statistics, and climate science with the publication of a new study examining regional snow cover trends across the Northern Hemisphere. The results suggest shrinking snow coverage as well as seasonal shifts for when the wintry layer comes and goes. The study, "Regional Analysis of Snow Presence Trends in the Northern Hemisphere," was published in January in the Journal of Hydrometeorology.

04:25
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Phys

Space Force won't launch Vulcan rockets until booster problem solved‎

United Launch Alliance was hoping to ramp up its new Vulcan rocket launches this year, but won't be launching any national security missions until it solves a recurring issue of booster nozzles burning off the rocket on launch.

04:25
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Phys

A tool lets residents track Texas power outages and aids in disaster response‎

Texas is known nationwide for its grueling hot summers. However, hurricanes and occasional winter weather can have a harsher impact on citizens and infrastructure due to the effects of power outages. Led by director and primary investigator Dr. Samuel Brody, researchers from the Institute for a Disaster Resilient Texas (IDRT) have created a tool that can show residents, emergency responders and policy makers where power outages are occurring in near real-time, helping users respond to disasters faster, safer and smarter.

04:25
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Phys

Radiocarbon dating rewrites angiosperm trees' lifespan records worldwide‎

For decades, scientists have relied on tree rings to estimate how long trees can live. But new research suggests that this widely used method may have been underestimating the lifespan of many flowering trees—sometimes by centuries. A new international study published in Radiocarbon shows that radiocarbon dating can dramatically extend the known maximum age of broadleaved trees, revealing that many species live far longer than previously thought.

03:05
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Phys

Poking a nanostring: Scientists uncover energy cascades in tiny resonators‎

Scientists at TU Delft have designed a nanostring that, when poked, doesn't lose its energy to the environment immediately. Instead, the energy leaks out within the string, triggering a cascade of distinct vibrational modes. For the first time, researchers have observed this cascade reaching all the way up to the fifth mode, while only actuating the first mode.

03:05
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Phys

Planting big native trees early can simplify forest restoration in Aotearoa‎

Native forest restoration usually starts with faster growing "nurse plants" that provide shelter under which to plant bigger trees—but new research suggests some big canopy trees can be planted early too. Scientists monitored over 1800 canopy trees at restoration sites around the Tāmaki Makaurau region for three years. They found four types—pūriri, rewarewa, kahikatea, and tōtara—had a high rate of survival when planted with the nurse species, though two others—rimu and taraire—did not. Spacing nurse plants 2 m apart to give shelter without too much competition or shade, and having some protective vegetation at ground level, also helped their survival.

03:05
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Phys

Ancient plant-eater with a twisted jaw and sideways-facing teeth was a 'living fossil' in its own time‎

In a dry riverbed in Brazil, in a dense forest near the Amazon, a team of paleontologists found a fossilized jawbone from an ancient animal. Over the course of their fieldwork, they found eight similar bones, each around six inches long—but no other bones that they could confidently use to complete a skeleton for one of these mystery animals.

03:05
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Phys

Jackdaw chicks listen to adults to learn about predators‎

Jackdaw chicks learn about predators by listening to adults, new research shows. Scientists played recordings of predator calls to chicks in their nests—and paired the sounds with either adult jackdaw "alarm" calls or "contact" calls that indicate no danger.

03:05
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Phys

Four decades of data give unique insight into the sun's inner life‎

Scientists have analyzed more than 40 years of astronomical data to uncover evidence that the sun's internal structure subtly changes from one solar cycle minimum to the next. Publishing their findings in Monthly Notices of the Royal Astronomical Society, researchers from the University of Birmingham and Yale University reveal that even small differences in solar magnetic activity produce detectable changes inside the sun.

03:05
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Phys

Bacterial abundance drives dissolved organic carbon distribution in North Atlantic gyre, model suggests‎

In the ocean, a haze made from tiny bits of dead plants, animals, and microbes hangs in the upper reaches of the water. Each particle is just a fraction of a micrometer across, but together the carbon within these particles weighs about 700 billion tons—about as much as all the carbon in the atmosphere.

03:05
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