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Nov 3, 2016
Why “Computronium” is really “Unobtanium”
Posted by Andreas Matt in categories: computing, engineering, particle physics, robotics/AI, space
Computronium is defined by some as a substance which approaches the theoretical limit of computational power that we can achieve through engineering of the matter around us. It would mean that every atom of a piece of matter would be put to useful work doing computation. Such a system would reside at the ultimate limits of efficiency, and the smallest amount of energy possible would be wasted through the generation of heat. Computronium crops up in science fiction a lot, usually as something that advanced civilizations have created, occasionally causing conflicts due to intensive harvesting of matter from their galaxy to further their processing power. The idea is also also linked with advanced machine intelligence: A block of matter which does nothing other than compute could presumably would be incredibly sought after by any artificial intelligence looking to get the most compact and powerful brain for its money!
Nov 3, 2016
Physicists Accidently Discover a Self-Destruct Button for the Entire Universe
Posted by Elmar Arunov in categories: entertainment, particle physics
It sounds like a plot from a comic book or a sci-fi film, a theory that got a boost when one of the greatest discoveries in physics in the modern era, the discovery of the “God particle,” or the Higgs boson, the missing piece in the Standard Model of particle physics. In the preface to his book Starmus, Stephen Hawking warns that the Higgs Boson field could collapse, resulting in a chain reaction that would take in the whole universe with it.
Theoretical physicist Joseph Lykken says it would probably take billions of years before we reach that point. Lykken hails from the Fermi National Accelerator Laboratory in Batavia, Illinois. If it did happen though, you wouldn’t know it. One instant you are here, the next, you and everything else is swallowed up by an enormous vacuum bubble, traveling at light speed in every direction. Humanity would never see it coming.
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Nov 3, 2016
Humans and Supernova-Born Neutron Stars Have Similar Structures, Discover Scientists
Posted by Shane Hinshaw in categories: biotech/medical, particle physics, space
As atoms in our bodies were made in stars millions of years ago, it’s been common to propose that we are, in fact, made of stars. Now comes news of another mind-blowing cosmic relationship as physicists conclude that human cells and neutron stars share structural similarities, which look like multi-story parking garages.
Neutron stars are quite strange space objects. They come to life as a result of supernova explosions of massive stars and are incredibly dense. While they are the smallest stars, they can pack as much mass as two Suns into a star with the radius of just 10 kilometers.
Nov 2, 2016
The wiring of fly brains—mapping cell-to-cell connections
Posted by Karen Hurst in categories: biotech/medical, computing, neuroscience
Biologists at Caltech have developed a new system for visualizing connections between individual cells in fly brains. The finding may ultimately lead to “wiring diagrams” of fly and other animal brains, which would help researchers understand how neurons are connected.
“To understand how the brain works we need to know how neurons are wired to each other,” says Carlos Lois, research professor in the Division of Biology and Biological Engineering at Caltech and principal investigator of the new research, which appears in the November issue of the journal Development. “This is similar to understanding how a computer works by looking at how transistors are connected.”
Animals are made up of different types of specialized cells. In order for an animal to function, the cells have to be able to communicate with each other. For example, neurons directly communicate with muscle cells so that an animal can move. In diseases such as cancer, this communication process can go awry: when tumors metastasize, they no longer “listen” to neighboring cells that tell them not to grow. Instead, the cancer cells grow uncontrollably and migrate to other parts of the body.
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Nov 2, 2016
Tiny graphene radios may lead to Internet of Nano-Things
Posted by Karen Hurst in categories: internet, nanotechnology
For wireless communication, we’re all stuck on the same traffic-clogged highway—it’s a section of the electromagnetic spectrum known as radio waves.
Advancements have made the highway more efficient, but bandwidth issues persist as wireless devices proliferate and the demand for data grows. The solution may be a nearby, mostly untapped area of the electromagnetic spectrum known as the terahertz band.
“For wireless communication, the terahertz band is like an express lane. But there’s a problem: there are no entrance ramps,” says Josep Jornet, PhD, assistant professor in the Department of Electrical Engineering at the University at Buffalo School of Engineering and Applied Sciences.
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Nov 2, 2016
A New Spin on the Quantum Brain
Posted by Karen Hurst in categories: neuroscience, quantum physics
Nov 2, 2016
Classic quantum experiment could conceal theory of everything
Posted by Karen Hurst in category: quantum physics
By Anil Ananthaswamy
AN ICONIC physics experiment may be hiding more than we ever realised about the nature of reality. The classic “double-slit” experiment reveals the strange duality of the quantum world, but it may behave more strangely than we thought – and could challenge one of the most closely held assumptions of quantum mechanics.
Revisiting it could help unify quantum mechanics with the other pillar of theoretical physics – Einstein’s general relativity – a challenge that has so far proven intractable.
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Nov 2, 2016
New technique for creating NV-doped nanodiamonds may be boost for quantum computing
Posted by Karen Hurst in categories: computing, nanotechnology, quantum physics
Researchers at North Carolina State University have developed a new technique for creating NV-doped single-crystal nanodiamonds, only four to eight nanometers wide, which could serve as components in room-temperature quantum computing technologies. These doped nanodiamonds also hold promise for use in single-photon sensors and nontoxic, fluorescent biomarkers.
Currently, computers use binary logic, in which each binary unit — or bit — is in one of two states: 1 or 0. Quantum computing makes use of superposition and entanglement, allowing the creation of quantum bits — or qubits — which can have a vast number of possible states. Quantum computing has the potential to significantly increase computing power and speed.
A number of options have been explored for creating quantum computing systems, including the use of diamonds that have “nitrogen-vacancy” centers. That’s where this research comes in.
Nov 2, 2016
Researchers explore how polymeric nanoparticles can be used to transport quantum dots into cells
Posted by Karen Hurst in categories: particle physics, quantum physics
Nanoparticles are particles that are smaller than 100 nanometers. They are typically obtained from metals and, because of their tiny size, have unique properties that make them useful for biomedical applications. However, without treatment to make their surfaces biologically inert, their effectiveness is severely limited. Researchers led by Kazuhiko Ishihara at the University of Tokyo have pioneered the use of MPC polymers to modify the surfaces of nanoparticles. In a recent article published in the journal Science and Technology of Advanced Materials, they reviewed current ways in which polymeric nanoparticles can be used to transport a type of small nanoparticles called quantum dots into cells.
Cells can uptake polymer nanoparticles embedding quantum dots covered with cytocompatible phospholipid polymer and cell-penetrating peptides. © 2016 Kazuhiko Ishihara, Weixin Chen, Yihua Liu, Yuriko Tsukamoto and Yuuki Inoue.
MPC polymers are large molecules made from chains of 2-methacryloyloxyethyl phosphorylcholine (MPC). Bioactive nanoparticles whose surfaces have been modified with them can be used as anti-tumor compounds, gene carriers, contrast agents that improve MRI images, and protein detectors. MPC polymers mimic cellular membranes and allow the delivery of bioactive molecules that are normally not very soluble in water or that might produce unwanted biological side effects. When scientists attach MPC polymers to the surface of inorganic nanoparticles, they can make substances that are easily delivered into the blood or other tissue.
