Sulfur Polymers Could Enable Long-Lasting, High-Capacity Batteries
Compressed air has volumetric energy density similar to lead acid (about half lithium ion) but extremely high power density. Energy density by weight is dependent on scale - bigger is better - because the weight scales as the surface area of the container while the energy scales with volume. But
If you are looking for a power boost on take off, compressed air is totally viable. Doubly so because it would naturally drive a propeller with an air motor which is more efficient at low speeds. Fix the expansion cooling by burning a bit of fuel in the expansion stream.
I won't want to be near a high pressure tank like that if it ruptured though! Maybe its a system that works better for cargo than human transport.
More Bad News For the F-35
I think you meant to say the A-10 is the best CAS platform. You seem to be saying that for the B-52?
I could see a roll for an A-10 like drone for CAS. CAS is by definition vulnerable to ground fire so it would be nice to have it remotely piloted. You wouldn't have a 30mm cannon but maybe 2-4 individually targeted 50 cals mounted on gimbals to handle infantry up to light material. A pilot and four gunners working remotely could really tear things up vs one pilot working in harms way. Compared to bombs intended for light material such as cluster bombs, the guns should create less collateral damage.
The 30mm cannon on the A-10 doesn't seem to have as much of a purpose when tanks are so easy to identify and take out with traditional strike aircraft. Not to knock a great aircraft but I think that cannon was designed to bust Russian tanks on the European plains. It's a real piece of work though... a tank gun with wings.
Ask Slashdot: Suggestions For a Simple Media Server?
I have the same setup people hear are talking about - headless NAS serving multiple WDTV boxes.
Don't "forget" to upgrade the firmware to WDLXTV firmware. It adds tons of features - nzbget, torrents, nfs, DNLA, subtitle download and much more. In a pinch you can even have one of the boxes serve content off a USB drive.
Kickstarter For Open Source GPU
No mod points so I'll comment. The binary blobs are generally not updated after a short period - sometimes as little as year. At that point you've effectively been EOL'd by your GPU because it is incompatible with later kernels. Sometimes, as is the case with the IMX6 SOC, the drivers are old when the device is released. Mir helps because android is more likely to get updates but serously... being unable to update your two year old ARM box is super lame.
Fortunately there are efforts to reverse engineer open source drivers but its an imperfect and time consuming endevor. It would be better to have open source from the get-go or code escrow at worst for 2-3 years. I bet you modern GPUs with reverse engineered drivers will trump FPGA implementations.
Ask Slashdot: Are We Witnessing the Decline of Ubuntu?
I just wiped my Ubunutu box after a drive failure and went Kubuntu. It's early days but so far I love it. It's very polished, responsive and easy to get "functional" IE with binary NVIDIA driver, non-free codecs etc. It feels like a premium product I should have to pay for.
Downsides - not many.... I haven't found an easy way to mount and unmount drives through the GUI but I'm sure its there. Menues feel a bit too nested but again- there's a fix or I get used to it.
Software Brings Eye Contact To Video Chat, With a Little Help From Kinect
Didn't RTFA of course but the smart way to do this is to start with video of someone actually looking at the person on the screen rather than the camera. That way camera sees an off angle but "correct" picture. that picture is then rotated so the remote video looks "right".
Qualcomm Says Eight-Core Processors Are Dumb
Qualcomm is likely referring to Samsung's octo core "big.LITTLE" SoCs. These chips have 4 performance cores and 4 power sipping cores. Software switches between performance and power saving modes. These chips make sense anywhere quad core makes sense AND they can be a little more power efficient.
This 4+4 strategy is basically the next iteration of power saving through dark silicon. Transistors are cheap so use piles of them but only power on the ones necessary at the time. Having 4 power saving cores seems like overkill but I imagine directly paralleling the 4 performance cores may make the switching more seemless / faster.
A Look At Quantum Computer Manufacturer D-Wave and Its Founder
Everytime an electron passes from the metal interconnect to silicon in a semiconductor a quantum process is occuring. The electron has to pass a thin but but carrier empty region by quantum tunnelling because the metal either fills or empties the region of the interface. So the electron has to do a "quantum jump" so to speak. So basically every semiconductor is quantum to a degree and in an instrinic way.
Ask Slashdot: What Would You Look For In a Prosthetic Hand?
For paint brushes and other small items I imagine holding them in her mouth will work better than current prosthetic hands.
You may be thinking about the robotic hands you can see in research clips but most available prosthetics are simple devices that open and close with a turn of the forearm.
The robotic hands suffer from difficulty getting a "close/open hand" signal from the brain. Implanted electrodes are all to some degree incompatible with human tissue and degrade over time. Sensors to read electrical signals through the skin are imprecise. Some versions use buttons manipulated by other body parts (likely toes in this case) but these are not in the mainstream.
The old fashion two finger hooks seem to be the most practical answer for a lot of people. They are cheaper, durable, don't require batteries and can do a lot of useful things with any fine motor manipulation.
A human hand is a marvel of biological engineering. Sadly it is tough to replicate in a prosthetic. Perhaps she would be a good candidate for a transplant down the road? Prosthetics may improve more quickly with so many vets having suffered limb loss. To date lower limb prosethetics seem to be well ahead of hands/arms in terms of matching the original limb's functionality. Lots of "below the knee" single amputies have no obvious impairment in terms of gait.
The Survival Machine Farm
I RTFA and agree that the TED talk is a far better representation of their goal then this article. The goal isn't to restart civiliation if an apocalypse comes.
Marcin tried to run his own farm. The equipment he bought was expensive and complex but not robust and not user servicable. As a phd in nuclear physics he figured he could puzzle out how to fix his equipment and make improvements but he couldn't. He also realized that "1st world" mechanized farming and by extension basic industry was totally inaccessible to developing economies or even bright individuals with 1st world access. This struck him as odd because farming and basic industry seems like the next step up from subsistance. But the gap between developing country resources and needs and what was available is simply too great. So he went about making robust, user servicable, modular equipment for farming, building houses, generating power and processing food.
Amazon Considering Buying Texas Instrument's Chip Business
I really wish someone would come out with a dual core arm SoC with e-sata and gigabit ethernet as a light duty server. 1BG of ram would be nice but 512MB would probably work too. Guruplug, some of the allwinner media boxes and BYO drives NAS boxes come close but each miss something or cost too much. Single core is weak for rar / par and can get bogged down (yea, yea scheduler, blah blah). USB can't set HD parameters, has material cpu overhead and is wonky for RAID. 100/10 is a bit weak throughput for even a SOHO server.
OMAP5 with the right configuration would get there. Please stop putting 100/10 interfaces on these chips @&#$%!
I'm ok paying for a light-duty gpu and hdmi display interface but e-sata and gigabit pls, pls ,pls.
Almost 1 In 3 US Warplanes Is a Drone
Global hawk is a high altitude, high resolution surveillance bird. It's like a drone version of the U2. I'm not surprised that it would generate HUGE amounts of data. They aren't spending tens of millions of those things to mount a web cam. Bandwidth for more pedestrian drones like the Reaper should be far lower.
I think the bandwidth and security solution will be high altitude relay planes/blimps over friendly territory so that signals can be line of sight in the air and then sent down to ground stations in friendly territory. That type of bandwidth is only problematic until it hits a terrestrial wire. At 40-50k feet line of sight is 200 miles to sea level and 400 miles for another high altitude airplane. By contrast geosynchronous orbits are 22,000 miles away and its a round trip. I guess it is possible to use LEO satellites but those are vulnerable in a way that GEO is not.
Line of sight signals from aircraft could be stronger and therefore harder to jam. Also the angle of the signal would be harder to duplicate and overwhelm from the ground. Also with multiple relay stations you'd have an alternate way to calcuate position like GPS but without the low power satellite constraints. Bonus points for one time pad encrypting the really sensitive stuff like controls. A 120GB SSD is a lot of unbreakable communication.
Research Promises Drastically Increased LiOn Capacity
Since graphene is only 1 atom thick it is tough to make a significant volume of material. It takes so many layers before you have any thickness. Hopefully the Si layer defines the bulk of the anode, because otherwise you'll just never be able to make a big battery. The cathode and anode need surface area to drive enough chemistry and a big enough cross section to handle the resulting current. That cross section will have to come from the Si...
Research Promises Drastically Increased LiOn Capacity
Close... They are rolling out in areas that have closed traffic systems, so called traffic islands. In Hawaii they have a traffic island because Hawaii is physically a collection of islands. Israel is a traffic island because Israelis rarely drive out of Israel, relations with the neighbors being what they are. Density is certainly a part of it but the closed nature of the roadways is a bigger one.
The F-35 Story
It's not that the Marines don't deserve an upgraded capability - the harrier is old, old, old... It's just too hard to meet all their objectives:
Supersonic, VTOL, stealth
Pick 2, not 3 - that is if you want a jet that can be made with today's technology in numbers that matter. I don't think stealth or supersonic speed are critical to the Marines. Isn't the purpose for the marines air support? I would pick stealth over SS and make sure to have a stand off air to air capability to defeat a limited air defense. If you need more than that, you need a carrier group.
The F-35 Story
It's the VTOL/STOL version for the marines that bogged the whole program down. It was just too ambious and when this became obvious the "solution" was to put almost all the focus on the Marine version to push it through. They should have paused the Marine version instead, met all the objectives for the convential and carrier versions, then come back to the marines. In 5 or 10 years we'll be smarter about how to do it, where the airframe can be lightened, how to put more thrust in the engines, etc.
US Funds Aggressive Tech To Cut Solar Power Costs
We've already hit the tipping point with $1/kw and falling PV. PV has no moving parts, a long service life and works well at the point of consumption (households). It is not so much more expensive than fossil fueled utility power after cost of carbon and power distribution is taken into account. Utility scale solar requires huge amounts of land. We should only do that after our southern facing roofs are covered in panels (or north for the aussies).
We need better batteries, not better solar power. A cheaper, denser battery that supports transportation uses and a dirt cheap, high capacity battery for time shifting loads is what we need.
Building Material Absorbs and Releases Heat
yes they are. Most PCMs are a mix of materials that phase change at different temperatures. Change the mix, change the phase change temperature. As long as the materials are not terribly different, the phase change occurs mostly at the average of the individual chemicals. Look up eutectic salts
The Most Expensive One-Byte Mistake
That's a pretty long string - generally ~20 pages of single spaced text and would rarely cause trouble. You could also just have a "big_string" type that could be longer just as we have int and long_int.
When I first learned C I thought the string style was odd. My first instinct was to have the length as the first byte or two as well but you learn the way it is and go with it.
Anyone is free to reimplement the string libraries with this alternative, just as everyone is free to switch from a qwerty to a Dvorak keyboard. In both cases most people are content with things as they are, imperfect as they are.
Slate: Amazon's Tax Stance Unfair and Unethical
And slavery was ended permanently by a constitutional amendment, the 13th amendment. It's hard to imagine a worse argument you could have made. Slavery was ended with the third amendment after the original bill of rights and the two before that were minor by comparison.
The framers knew they were fallible and that the needs of the country could change. They created the amendment process to facilitate making those changes.
They were wrong on slavery; we have a civil war; 13th amendment passes. Error corrected. Hate the second amendment? Get an amendment passed. It isn't ambiguous at all.
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