Thursday, December 31, 2015

Taiwan would need 200 or more fifth generation fighter jets for a credible deterrence by 2017-2019

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New advances by China on its J-20 stealth fighter diminishes deterrence across the Taiwan Strait, a leading weapons expert in the US said.

“It is crucial that Washington begins to consider Taiwan’s next-generation requirements for air defense,” International Assessment and Strategy Center (IASC) senior fellow Rick Fisher said.

“Given over a decade’s worth of global technology advances, intensive investment and competent program management, it should come as no surprise that China will be the second nation in the world to start production of stealth fighters,” it said.

“The J-20 will give the People’s Liberation Army Air Force a technological advantage over every other Asian air force. While the J-20 may not be able to supercruise [fly at supersonic speeds without using fuel-thirsty afterburners] with its current Russian AL-31 turbofan engines, its high level of strength, long range and electronic warfare capabilities will make it a very formidable foe for other fighters,” it said.

Fisher told the Taipei Times that the status of the J-20’s engine was critical to determining the plane’s superiority to Taiwan’s modified F-16 planes and how soon the J-20 would be competitive with the US’ top-of-the-line fifth-generation Lockheed F-22A.

He said that Washington should now consider a fifth-generation fighter for Taiwan or the provision of advanced engine and electronics technology to allow the nation to produce its own next-generation fighters.

RAND has calculated that the US would need 2160 (30*72 aircraft in a wing) jets to assure air superiority victory in a simulated 2017 conflict with China over Taiwan.




The United States would have better prospects of prevailing in an attrition campaign designed to defeat a Chinese air offensive over time. Nevertheless, PLA Air Force modernization has made such a campaign more challenging. The number of wings required is shown as medium-shaded bars (seven days) and dark-shaded bars (21 days). Even in the attrition case, the United States would face increasing difficulty meeting its objectives in 2017, as more aircraft would be required, and there would be fewer bases to offer safety from Chinese missiles.

The results should be understood in context. China cannot achieve air superiority in any of these cases, and U.S. fighters achieve high kill ratios throughout. Relaxing the 21-day time requirement would reduce U.S. in-theater force requirements to levels that might be supported more easily by the available basing infrastructure. However, until U.S. forces achieve air superiority, the PLA air forces would largely have a free hand in attacking targets in Taiwan. A ground campaign in Taiwan would likely be decided relatively quickly, and the inability of U.S. air forces to achieve air superiority during that time would deprive U.S. and friendly forces of much-needed air support.

Taiwan or the US would need to base or rapidly deploy 200-300 fifth generation jets in and around Taiwan to grind out an attrition campaign in 2017. 400-500 fifth generation jets would likely be needed in 2019 to achieve the same result.

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16 million neurons and 4 billion synapses in a carry on suitcase form factor

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A few months ago, IBM unveiled the NeuroSynaptic Evaluation (NS1e) board, which contained a single TrueNorth chip, along with circuitry for interfacing the chip to sensors and real-world data. These boards were used in their August 2015 “Boot Camp” event, in which participants learned how to program the chip to implement cognitive systems [Brain-Inspired Computing Boot Camp Begins]. During BootCamp, each NS1e board was housed in its own plastic case, and for convenience, they built a rack to hold the 48 boards used during that event. Although the rack nicely organized and displayed the boards, a bulky assembly of power strips, ethernet switches, and servers were also required for their use.

Recently, a government client requested that IBM build a system of 16 NS1e boards, with power unit, ethernet switch, and Linux server all housed in a compact, self-contained unit, where each of the NS1e boards can be seamlessly integrated, but mounted in such a way that any individual board could be swapped in or out easily. This requirement led us to explore designs in which individual NS1e boards are mounted on cards that could be inserted vertically into a card rack and all elements were mounted in a small desktop rack unit.

They turned to a USB-style power distribution module developed by Cambrionix. While normally intended to charge and sync cell phones and tablets, it’s port capacity (16 USB ports) and current limits were suitable for our purposes. However, with typical USB connectors plugged into the Cambrionix board, the height required was close to 2U (3.5″), greater than the 1U we had allocated for the power distribution unit in the initial design. Fortunately, the card rack holding the NS1e boards did not occupy the full depth of the rack and we had just enough room to design a step-down enclosure using 1U of space above the NS1e drawer and dropping down to 2U in the back. Finally, to give some visual appeal, they united the 16 individual NS1e boards by spreading a graphic (our award-winning visualization of the network diagram of the monkey brain) across their front panels and added some accentuating LED strip lighting on both sides of the drawer and below the chassis.

Building the system, once all the planning was complete, was relatively straightforward.

The end result is a system that provides 16 million neurons and 4 billion synapses in a package about the size of a carry-on suitcase.




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Spiders sprayed with water containing carbon nanotubes and graphene flakes have produced the toughest fibers ever measured

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Spider silk is one of the more extraordinary materials known to science. The protein fiber, spun by spiders to make webs, is stronger than almost anything that humans can make.

Nextbigfuture covered this work in May but here is some more details.

The dragline silk spiders use to make a web’s outer rim and spokes is amazing stuff. It matches high-grade alloy steel for tensile strength but is about a sixth as dense. It is also highly ductile, sometimes capable of stretching to five times its length.

This combination of strength and ductility makes spider silk extremely tough, matching the toughness of state-of-the-art carbon fibers such as Kevlar.

Researchers found a way to incorporate carbon nanotubes and graphene into spider silk and increase its strength and toughness beyond anything that has been possible before. The resulting material has properties such as fracture strength, Young’s modulus, and toughness modulus higher than anything ever measured.

The team’s approach is relatively straightforward. They started with 15 Pholcidae spiders, collected from the Italian countryside, which they kept in controlled conditions in their lab. They collected samples of dragline silk produced by these spiders as a reference.



The team then used a neat trick to introduce carbon nanotubes and graphene flakes into the spider silk. They simply sprayed the spiders with water containing the nanotubes or flakes and then measured the mechanical properties of the silk that the spiders produced.

For each strand of silk, they fixed the fiber between two C-shaped cardboard holders and placed it in a device that can measure the load on a fiber with a resolution of 15 nano-newtons and any fiber displacement with a resolution of 0.1 nanometers.

The results make for impressive reading. “We measure a fracture strength up to 5.4 GPa, a Young’s modulus up to 47.8 GPa and a toughness modulus up to 2.1 GPa,” say Pugno and co. “This is the highest toughness modulus for a fibre, surpassing synthetic polymeric high performance fibres (e.g. Kelvar49) and even the current toughest knotted fibers,” they say. This approach could be extended to other animals and
plants and could lead to a new class of bionic materials for ultimate applications.

There are challenges ahead, of course. Nobody has discovered an efficient way to harvest spider silk, although not for lack of trying. So an important future step will be the development of such a technique that can work on an industrial scale. That would open the way to widespread applications in everything from tissue repair to garment design.



Arxiv - Silk Reinforced With Graphene Or Carbon Nanotubes Spun By Spiders

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Scaling DNA production in 2016

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Nimble startups are competing to fashion automated DNA assembly lines that would make Henry Ford proud, using techniques copied from the fabs that make computer chips. As their innovations bring down the cost of constructing DNA strands, these entrepreneurs are aiming for a low price point, which they say will cause a market boom. Twist Bioscience, which will begin commercial operations at its San Francisco headquarters in 2016, is a leading contender in that race to the bottom.

Twist invented a machine that automates the DNA construction process.

The heart of the machine is a silicon plate pocked with 10,000 tiny wells, which are etched using the same photolithography techniques perfected by computer chip manufacturers. A different strand of DNA can be constructed in each 600-nanometerwide well. The machine does “the exact same chemistry” as a Ph.D. student would do, Leproust says, “only in a volume that’s 100 times smaller.”

Twist isn’t selling its machine but rather its DNA manufacturing services, which are aimed at researchers and startups seeking new genetic modifications that might prove useful. In 2015 the company began production runs for select customers; 2016 will see Twist’s full commercial launch. DNA assembly is priced on a cost-per-base model, and Leproust says her company’s 10-cents-per-base starting price is already the best in the industry. But she’s aiming for a 2-cent price point.

Another synthetic-biology startup in the San Francisco area, Zymergen, offers customers a broader set of services. The company not only constructs DNA snippets on the cheap, it also inserts that DNA into microbes and monitors the outcome.

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Your first look at plans to turn historic Forest Theater in Fair Park (back) into a concert venue

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Click to enlarge a possible look for the redone Forest Theater (Barry Blackmon for Callison/Junie Development LLC) The historic Forest Theater could become to Fair Park what the Kessler Theater has become to North Oak Cliff, at least according to … Continue reading
Reposted via City Hall Blog

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Sacred geometry

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Sacred geometry


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Anatomic Particulars

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Anatomic Particulars by David Adey


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cube

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cube


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