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• вчера2462 пересылки3 реакции1 комментарийОткрыть в Telegram
  We can finally measure the damage each new coal, gas or oil project will do to people and nature We have long known every tonne of carbon dioxide matters to the climate. But governments keep approving new fossil fuel projects—even as climate change worsens. Until now, it's been difficult to say how much damage and extra warming a specific project will cause. Fossil fuel companies—and government agencies approving their projects—have often relied on what's known as the "drop in the ocean" defense. While backers concede a new project will add more carbon dioxide emissions to the atmosphere, they say those emissions are tiny compared with the global total and that it's almost impossible to track damage attributable to an individual project. This defense won't work anymore. In recent years, attribution science has advanced rapidly, allowing scientists to pinpoint the role of climate change in making disasters and extreme weather more likely. Our new open-source climate tool—the Carbon Impacts Tracer—goes one step further. It shows how much a new project will warm the planet and how much damage it will cause across eight areas, from crop losses to heat wave deaths in Europe. This will help hold fossil fuel companies and governments approving these projects accountable for the damage the projects will cause... Source: Phys.org @EverythingScience

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• 2 дня назад4342 пересылки2 реакцииОткрыть в Telegram
  When everyday sounds trigger big feelings: Inside misophonia research Misophonia causes strong emotions in response to everyday sounds like chewing or sniffing. The condition often involves feelings of immediate distress or anger. This can be confusing and upsetting for children, adults and their families or friends. Misophonia can disrupt family meals, school, work, friendships and other parts of daily life. At Yale Child Study Center, associate professor Thomas Fernandez, M.D., works with patients who struggle with misophonia. Fernandez also studies the genetics of misophonia and other conditions. In a recent interview with the Misophonia Research Fund (MRF), he described current research investigating how misophonia is rooted in the brain. He also discussed how discoveries about underlying biological mechanisms could ultimately lead to more targeted treatments. Read on for key takeaways from the interview and a follow-up with Fernandez about the research. What is misophonia? Is it real and rooted in the brain? Misophonia can cause intense feelings of distress, anger or panic when someone hears chewing, sniffing, tapping or other sounds. "The response can feel immediate and involuntary, and some people avoid shared meals, classrooms, workplaces, or social situations to escape triggers," Fernandez says. He emphasizes that these feelings are real, even if others are not bothered by the same sounds. Misophonia is brain-based. Understanding this can help reduce blame, conflict at home and misunderstandings at school or with friends. A growing body of research indicates that misophonia reflects differences in how the brain responds to certain sounds. Studies point to networks involved in sound, emotion and salience, the process in the brain that flags something as especially important. Researchers are still working to understand exactly how these systems interact and develop. What is clear is that the response is not a matter of willpower or simply being "too sensitive"... Source: Phys.org @EverythingScience

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• 3 дня назад4956 пересылок5 реакцийОткрыть в Telegram
  Japan switches on its first full-stack room-temperature quantum computer — and scientists plan to scale it up to 10,000 qubits Researchers in Japan have switched on "Shunkai," a neutral atom quantum computer that scientists hope to scale into a 10,000-qubit behemoth by March 2031. Shunkai is the first full-stack system of its kind in Japan, meaning it features the software, control and hardware layers needed to read user inputs and return a result — not unlike a conventional PC. In theory, that means it should be easier for researchers to get some meaningful use out of the machine, with the team behind Shunkai planning to open it up to external users over the coming years. In a statement, project lead Kenji Ohmori, a professor of photo-molecular science at the Institute for Molecular Science, said researchers' use of Shunkai would "lead to ripple effects on various fields in industry, academia, and government around the world." The team behind the new machine plans to integrate it into an existing shared supercomputing facility to create a quantum-GPU hybrid computing center. Quantum computers: Powerful but impractical Unlike traditional, or "classical," computers, quantum computers operate according to the strange laws of quantum physics. In quantum systems, qubits — in the form of superconducting circuits, trapped ions or photons (among other modalities) — represent the fundamental building blocks of quantum information. These can exist as a 1, 0, or a "superposition" of both states at once... Source: Live Science @EverythingScience

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• 4 дня назад5454 пересылки3 реакцииОткрыть в Telegram
  A Startup Wants to Power Data Centers With ‘Supercritical’ Carbon Dioxide A new company has a plan to make the dirty gas turbines powering data centers more efficient: liquid carbon dioxide. American Supercritical came out of stealth Wednesday, announcing $8 million in funding. It wants to retrofit inefficient gas turbines that many data centers rely on for power with units that can generate more power, without adding more emissions (though the gas-fired turbines will continue to emit carbon pollution). The technology can also theoretically be used on a wide variety of energy sources at a time when power demand is skyrocketing. “We want to start with gas turbines but eventually expand beyond that,” says cofounder Simon Shuham. Most large gas-fired power plants in the United States use an array of heat engines in what’s known as a combined-cycle process: First, turbines generate electricity from burning compressed air and natural gas, then a separate engine uses the hot exhaust to make steam and create additional energy. But for a variety of reasons, data centers across the US have opted to power their operations with what are known as simple-cycle turbines, and exclude the steam component. These turbines are much less efficient than combined-cycle plants. Usually, only about 35 percent of the energy from simple-cycle turbines is converted to electricity, while the rest escapes as exhaust. (In combined-cycle plants, that figure hovers closer to 60 to 65 percent.) That exhaust includes greenhouse gases, making plants that run on simple-cycle turbines a much worse choice for the environment than combined-cycle plants. The size of some of these plants combined with their inefficiency is a recipe for climate disaster. A massive data-center power plant in Texas that Amazon is building with just simple-cycle turbines, for instance, is permitted to emit more than 33 million tons of greenhouse gases per year—more than the annual total of some small countries. But all these small, inefficient turbines could be a great match for supercritical CO2 technology, American Supercritical’s founders say. Carbon dioxide becomes supercritical when it’s pressurized and held at a certain temperature. In this state, it gets the density of liquid but still behaves like a gas, meaning it can move energy more efficiently through much smaller amounts of equipment. American Supercritical wants to attach its units to small gas turbines and help generate more energy. While the turbines themselves would still use gas, the supercritical CO2 unit can use the hot exhaust generated from those turbines to create additional electricity. Instead of using that heat to boil water and create steam, the heat is transferred directly by the pressurized CO2 to generate additional energy with no additional emissions. “We’re essentially building miniature combined-cycle plants,” says Shuham. Using supercritical CO2 also can eliminate or greatly reduce water use in the power generation process—something that’s drawn intense scrutiny when it comes to data centers. Importantly, the CO2 involved operates in a closed-loop system, meaning that it doesn’t have to be refilled. Cofounder Matthew Carlson, who researched supercritical CO2 for more than a decade, likens it to refrigeration systems that circulate CO2 to facilitate cooling. Source: Wired @EverythingScience

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• 5 дней назад7024 пересылки2 реакцииОткрыть в Telegram
  Researchers Reconstruct Face of Oldest Known Homo sapiens In the early 1960s, a worker extracting minerals at Jebel Irhoud, in Morocco, uncovered a skull with strikingly human features. Named Irhoud 1, the fossil was initially identified as an African Neanderthal variant about 40,000 years old. Later dating studies pushed the age of the find back, to between 100,000 and 200,000 years in 1991 and to about 160,000 years in 2007. In 2017, two studies reclassified Irhoud 1 and associated remains as Homo sapiens and gave them an age of roughly 315,000 years, making them the oldest known representatives of the species. “In 2017, the Max Planck Institute for Evolutionary Anthropology (MPI-EVA) publicly released image and video data regarding the three-dimensional digital reconstruction of the Jebel Irhoud skull,” said corresponding author Dr. Johari Yap Abdullah, a researcher at the Universiti Sains Malaysia and Saveetha University, and his colleagues. “The three-dimensional model in question constitutes a composite skull, structured through the spatial integration of multiple specimens excavated from the same stratigraphic unit.” The MPI-EVA model is dominated by the Irhoud 1 fossil, the original 1961 find, which supplies the braincase and upper face. A mandible from another individual, Irhoud 11, and fragments from other specimens fill the gaps... Source: Sci.News @EverythingScience

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• 5 дней назад5896 пересылок4 реакцииОткрыть в Telegram
  'Everything we know about space travel is going to change within a decade': The fusion breakthrough that could unlock a path to the stars Fusion-powered space travel has long held the promise of rapid trips across the solar system: Mars in weeks, Saturn in months, Pluto in years. For decades, such possibilities have remained theoretical, like something plucked out of a science fiction novel. But several companies are now working to build practical nuclear fusion propulsion engines, with significant milestones being hit. Pulsar Fusion, a U.K.-based startup, hopes to launch a demonstration mission to space in 2027, while Princeton University and Helicity Space in the U.S. are continuing their own work on fusion drives. If any of these efforts prove successful, missions across the solar system for robots and humans could be unlocked like never before, turning us into a true spacefaring species. "If we continue on the current trajectory, everything we know about space travel is going to change within a decade," Stephane Lintner, CEO and co-founder of Helicity Space, told Live Science. But is it too good to be true? Can the dream of nuclear fusion propulsion ever be fully realized, or will it remain a sketchbook fantasy? After decades of dreaming, we might be on the cusp of finding out... Source: Live Science @EverythingScience

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• 6 дней назад5535 пересылок2 реакцииОткрыть в Telegram
  Biology Might Not Be Quantum, but Its Math Is Quantumlike Two decades ago, scientists seemed on the verge of understanding biology in a new, quantum way. Life unfolds over an incomprehensible span of scales, from our planet-enveloping biosphere at one end, to individual cell-building biomolecules at the other. Even at its most microscopic, though, biology doesn’t really reach down to the quantum realm, in which particles act like waves, become entangled with one another, and exist in superpositions of multiple states at once. But scientists in the field of quantum biology are searching for ways that organisms might be able to push quantumness into the space, time, and temperature domains relevant to life, to make use of its strange properties. In photosynthesis, for example, organisms use specialized pigments and proteins to harvest light with nearly perfect quantum efficiency; they convert almost every incoming photon into useful chemical energy. In 2007, new evidence suggested that life might accomplish this feat by taking advantage of a quantum effect called coherence. The result buoyed the controversial idea that, despite being a warm, wet, and decidedly classical environment, a living cell could maintain — and even exploit — fragile quantum states. Gregory Scholes, a chemist at Princeton University, was initially enthusiastic about the result. He and colleagues followed up with experiments on photosynthesizing proteins and pigments and came away with similar conclusions. But today, Scholes is skeptical that quantum effects play a role in life. In fact, he’s convinced that the way forward for quantum biology might not be quantum at all. Rather than taking advantage of genuine quantum effects, Scholes proposes, life might be imitating them instead. In several papers published over the past three years, Scholes and colleagues have shown that complex networks of classical objects can conspire to produce phenomena that mathematically mimic quantum objects. Don’t be fooled: The states that these networks produce are not truly quantum; they’re only “quantumlike.” They arise when many interacting, oscillating parts add up to a collective whole whose behavior obeys the same mathematics that makes predictions about the quantum world. Source: Quanta Magazine @EverythingScience

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• 6 дней назад6033 пересылки4 реакцииОткрыть в Telegram
  Scientists made a paper battery you can swallow to power internal medical devices Scientists built a swallowable paper battery that can power medical devices inside the body and then gradually break down after its job is done. So far, the battery has been tested only in pigs, in which it powered devices for up to three days. If proven safe and effective in people, the battery could someday power temporary devices inside the gut while avoiding surgery to retrieve a conventional battery from the body when the device is no longer needed. "I'm very excited about this work," said Reza Ghodssi, a professor of electrical and computer engineering at the University of Maryland who was not involved in the study. "The battery is one component that takes up most of the space in an ingestible device, so anything that can provide the required power while reducing the size of the capsule is very promising." Examples of ingestible medical devices include those that detect bleeding, dispense medicines, or stimulate specific tissues or organs. How does the battery work? Conventional batteries used in ingestible devices are not only large; they also need to stay sealed to prevent their internal materials from leaking into surrounding tissue and causing damage. The new battery, described Monday (Sept. 21) in the journal Nature Chemical Engineering, is made from materials that gradually dissolve in the acidic gastrointestinal tract and can then be safely absorbed without leaving behind harmful fragments or toxic byproducts... Source: Live Science @EverythingScience

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• 24 сент.5724 пересылки4 реакцииОткрыть в Telegram
  Could negative mass exist and be observed? Unlike electric charge, as far as we know all mass is positive, and positive masses attract one another. Could negative mass exist, and if so, what would be the ramifications? Antigravity between a positive mass and a hypothetical negative mass has received a fair bit of attention in both physics and science fiction over the years. For example, in 1901's "First Men in the Moon" author H. G. Wells imagines a substance he calls "cavorite" which creates a negative force of gravity and thus acts as a gravity shield. In Newton's theory of gravity, negative mass would effectively appear as his same equation but with the gravitational constant G replaced by -G. But Einstein's version of gravity, general relativity, is not so kind, and does not seem to consistently allow anti-gravity. In a new paper in Physics of the Dark Universe, Shin'ichi Nojiri from Japan and S.D. Odintsovc from Spain dig deeper into the possibility of negative mass objects (NMOs) and conclude that the idea may not be as exotic as is thought. Using theoretical tools, they show that negative mass "does not always lead to any inconsistency." Where negative mass could arise Mass comes from a particle's interaction with the Higgs field, and most of a particle's mass is actually binding energy (remember Einstein: m=E/c²) between its constituents. Protons, 1,836 times more massive than electrons, are composed of three quarks and gluons bound together. The quark masses are only about 9% of the proton's mass, according to lattice gauge theories of quantum chromodynamics. The rest comes from the field energy of gluons that mediate the dynamics inside the proton... Source: Phys.org @EverythingScience

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• 24 сент.55310 пересылок4 реакции1 комментарийОткрыть в Telegram
  The hydrogen in your body and present in every molecule of water came from the Big Bang. There are no other appreciable sources of hydrogen in the universe. The carbon in your body was made by nuclear fusion in the interior of stars, as was the oxygen. Much of the iron in your body was made during supernovas of stars that occurred long ago and far away. The gold in your jewelry was likely made from neutron stars during collisions that may have been visible as short-duration gamma-ray bursts or gravitational wave events. Elements like phosphorus and copper are present in our bodies in only small amounts but are essential to the functioning of all known life. The featured periodic table is color coded to indicate humanity's best guess as to the nuclear origin of all known elements. The sites of nuclear creation of some elements, such as copper, are not really well known and are continuing topics of observational and computational research. Image Credit: NASA's GSFC, SVS Source: @apod @EverythingScience

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