20 if you can manage a Strowger rack.
280 posts • joined 14 Dec 2007
Re: Right about now...
Problem is, those tax shelter republics aren't in the EU so any profits they make selling Shiny!s in the EU can't be shuffled through a third-floor rented office in TaxShelterStan to appear on Apple's books for their quarterly reporting without paying the going rate of corporation tax. Bit of an embuggerance, that.
The Saturn V rocket flew with an ST-124M inertial navigation unit providing acceleration and roll, pitch and yaw information to the flight control system. It was about 60cm in diameter with beryllium gimbals and frame and tungsten gyro rotors and weighed a chunk along with its associated nitrogen gas supply and electronic control box. The MEMS accelerometer in a cheap phone today would do better.
As far as accumulating errors in position over time, subs can cheat by using topographic maps of the sea bottom and comparing them with sonar images instead of coming up close to the surface to get a GPS lock. There's a reason for all those hydrographic survey vessels many navies employ, after all. It's only really useful though in a few rare circumstances and it requires them to use their active sonars, not something the Silent Service likes doing unless they're shooting at someone.
Doomed by Jobs
Apple's doom was sealed (so to speak) by Steve Jobs back in 2008 when he slid the first Macbook Air into an envelope during the Macworld keynote to demonstrate how slim it was. Ever since then new Apple kit (absent the dustbin Pro) has had to be slim and every succeeding generation of tablets, laptops and phones has had to be slimmer than the previous one. That means pro-class laptops that can't be opened for repairs or upgrades, iMacs that are glued together to be pointlessly slim on the desktop and ever-slimmer iPhones which will be losing their headphone jack in the next release because it limits a further reduction in case thickness.
Slim has had a good run but it's hit the buffers.
I was breathlessly informed a few years back that there would be EU-wide road pricing based on GPS in place by the end of 2015 with every vehicle including kid's trikes tagged and monitored 24/7 by the Evull EU. The respondent had probably seen the same document you're hyperventilating about, a "what if" paper saying "could we do this?" like sixty-thousand other Powerpoint presentations that went nowhere.
If the UK government wanted to do this they've got enough ANPR cameras on the main roads to implement a road-pricing scheme without requiring everyone to fit a GPS tracker on their vehicles -- it's already illegal to not have camera-readable licence plates, after all.
December 2015 had fourteen launches, a record for a single month I believe. There were three launches in a single 24-hour period on the 16th and 17th of that month comprising an Indian GSLV with a range of payloads, a Chinese Long March with a dark matter experimental satellite and an ESA Soyuz from Guyana carrying two Galileo satellites.
It's a rare month that doesn't have at least eight launches these days.
Received the recall email yesterday
I'll probably take the 12 quid credit as I'm not actually using the wallwart adaptor that came with my Fire tablet (it was an Xmas present) anyway. They said they'll send a prepaid envelope to return it.
Seven Minutes of Terror
Mars missions seem to bring out the John Williams in all the teams that make an attempt to put something on the ground there. Google "Seven Minutes of Terror" for the JPL video about the Curiosity rover landing a few years ago and listen to the dramatic heart-in-your-mouth music soundtrack.
Re: Par frying chips
There's a reason chip pan fires was one of the top five causes of house fires in Scotland for a long time -- the second pass in the liquid cow has to be at a temperature that is damn close to flashover. My Dad didn't know the the old radio ham phrase "tune for maximum smoke" but he always kept a wet towel handy when making chips. Oh, and he grew his own tatties too, Maris Pipers, a great chipping potato but now, Ghod Preserve Us, an "heirloom" variety. I blame the English and their foofy King Edwards.
Re: Pi Zero availability
I need a cheap-as-chips blob of computing power to connect to a cheap USB microscope and feed a TFT display I got out of a bin. A full-size full-price Raspberry Pi is quadruple the price and it would be overkill with all sorts of features I don't need. The Pi Zero at a fiver is within my three-pints of beer budget for this project, if I could find any for sale.
It says something about the market for such a board that they can't keep up with demand at the moment. Maybe when things quiet down a bit...
Pi Zero availability
I've been looking to buy a Pi Zero for a "blob" project (i.e. a small lump of computing power to do a simple specific job, nothing more). Is there a source for Pi Zeros out there that is not permanently out of stock and is willing to sell one at a reasonable price including postage today or tomorrow? Anyone?
Re: Someone forgot Grasshopper
And those that recall Grasshopper have forgotten the NASA vertical-takeoff and landing rocket, the DC-X which did pretty much everything the Grasshopper did but twenty years earlier.
Adobe Creative Suite 2
A couple of years ago Adobe shut down their registration servers for Creative Suite 2 and published universal keys for users still working with the several-generations-out-of-date software suite. About five microseconds after the keys were released sites with downloadable installation media for CS2 started appearing on the web...
Mobile phone review
Weird to read a review of a phone that actually considers voice call quality and the radio stack as being worthy of being discussed. That's usually relegated to page 23 of any review if it's mentioned at all.
Re: If you try the hoverboard game..
And up above too (lots of Star Wars references...). There are also "soft" areas here and there in the floors and ceilings where the hoverboard can get through.
Use the right equipment for the job
Taping the grip of a CO2 extinguisher is fraught with danger, there's a risk someone could undo the tape in time. Cable ties, now... They're also good for bypassing those bothersome "grip safety" cutouts on chainsaws and the like, tape peels off when it gets soggy with, uh, "fluids". Or so I conjecture.
Re: The comic book element Thorium..
The Germans have a pebble-bed reactor, the THTR-300 which was partially fuelled with thorium. It blew up a couple of days after the Chernobyl reactor went kaboom! back in 1986 and the operators tried to pretend the plume of radioactive pollution from their reactor was actually from the Ukraine until someone did some isotopic analysis and said "hold on, that looks funny...".
The Germans are still wondering what to do with their THTR-300. Waiting for the radioactivity to decay is the best option they've come up with but it's basically passing the buck to the next generation (so to speak). They might, just might be able to start disassembling it in 2027 according to the Dickipedia article.
Re: That treaty is a two way street and The US has been doing Navy Exercises with them Lately
Yokosuka naval base south of Tokyo is a wholly-owned subsidiary of the United States Navy. It usually has a CVBG parked there i.e about 10% of the US' capital ship fleet. Time was the Yokosuka carrier was the Kittyhawk since it was the last conventionally-powered fleet carrier the USN had but it's now gone to the great razor-blade factory and the carrier parked there is currently the Reagan or maybe the Washington, both nuclear-powered of course.
A lot of the Japanese fleet is based on US designs like the Aegis cruisers in part so they can interoperate with the Americans. They've been carrying out exercises with the USN for decades.
Re: Wait, what?
"If the Japanese are launching orbital payloads on all-solid rockets, then you've got reasons to send weapon inspectors for a look."
You mean like the Japanese Epsilon satellite launcher?
It doesn't have the lift capacity of the JAXA H2A or the H2B (the ISS resupply launcher) but it could certainly put a small-ball Bucket of Instant Sunshine pretty much anywhere on the planet in less time than it takes you to get a Deliveroo pizza delivered to the wrong door on a different street.
They've test-fired it once, it worked, they don't seem in much of a hurry to launch another one.
ESA has the Vega (aka Berlusconi's Bottle Rocket), same principle although it's been launched a few times now unlike the Epsilon.
Maximum video output
Will the mini-DP connector drive an external 4k monitor (3840x2160) at 60Hz? Can it drive multiple monitors with pass-through?
Re: Let's replace "1970s-era hydrogen technology"...
LH2 is a sixth the density of RP-1 kerosene, not a tenth. It's still bulky and difficult to produce, handle on the launchpad and burn in a rocket motor but it produces much better performance than LOX/RP-1 during most of the flight once it's out of of the atmosphere as the jet velocity is a lot higher. At low altitudes rockets aren't travelling very fast so drag isn't that important and by the time they're going fast they're almost out of the atmosphere and drag is again not an important factor.
The most advanced liquid fuelled engines are LOX/LH2 -- the Ariane V Vulcain 2, the Japanese H2 series engines and the RS-68 that powers the largest launcher currently available today, the Delta 4 Heavy which is a pure LOX/LH2 launcher whereas the others use solid boosters as an assist during the early part of the flight.
Even SpaceX want to move forward from RP-1, developing the Raptor engine burning liquid methane (which is less dense than RP-1 necessitating larger tanks and with theoretically similar performance to LH2 without its deep cryogenic problems). However others have tried liquid methane before and abandoned it. I've heard there's a problem with coking up of the injectors and damage to the turbopumps using methane due to decomposition of the fuel.
Numbers, man, numbers!
I ran the numbers on this event a while back during a discussion about it in an email bounce...
Working the numbers as I go along while poking Dickipedia with a long stick... specific heat of steel averages 620J/kg per deg C. The steel lid is about 600 cubic inches if the size you give is correct, that's about 10,000 ccs in volume. Typical steel density is 7.9 g/cc so the lid weighed 790kg. Melting point of steel is about 1500 deg C so it would take 620 x 1500 x 790 Joules or about 750 MJ for complete slagging of the plate. I am ignoring any radiation heating from the explosion (X-rays, neutrons, gamma flux etc.) as I assume the cap was a last-defence thing and not directly coupled to the Device which was Exploding (i.e. it was not line-of-sight to the device).
Assuming the 50km/sec figure at ground level is correct and that is a SWAG at best -- explosive-gas-driven devices such as artillery shells top out at about 2 km/sec and light-gas guns using hydrogen or similar low-mass gasses are not that much faster -- then its kinetic energy on "takeoff" was 1/2 M x V^2 = 1/2 x 790 x 50 x 50 x 10^6 = 1TJ or over a thousand times as much energy as required to melt it completely. The Pascal-B shot only yielded about 300 tonnes equivalent, or about 1.25TJ which would mean the explosion would have to have expended 80% of its energy in driving the plate to that speed.
There are other factors which also indicate the manhole cover never reached anything like escape velocity -- the shaft to the Pascal-B device was 150 metres deep and about 1 metre square assuming the size of the cap so there's another 180kg of air to be accelerated up to at least 50km/s before it hits the underside of the cover. There's also friction with the walls of the shaft, energy losses in compressing and heating that much gas etc.
Actually no. Scientists did SCIENCE! on it and discovered higher levels of CO2 in the atmosphere don't improve plant growth. Pity about that.
Re: This good be good news or bad news.....
Places like Canada (Cigar Lake) and Australia (Olympic Dam)?
Uranium is mined all over the place, it's not particularly scarce or very expensive. It can even be extracted in useful quantities from seawater although that's not as cheap as digging it up, extracting it from mine spoil heaps or underground leaching.
Not a problem. Just go to the board and tell them you need a few million quid to hire a team of upper-level coders and system analysts and put together a test setup to prepare the company for something that's going to happen in five years time. It will involve various parts of the company acting as guinea pigs, messing with their established IT setups as parts of it are rolled out and getting in the way of them doing their jobs. Large parts of it might not work anyway and need even more investment in new software, new systems and further training for users.
I'd keep your CV up to date while you do this, but don't mention any of this on it. Say you left the company to explore new opportunities or some other bullshit instead.
Re: Saturns I, IB, & V
There are also the ESA Vega launchers with five successful launches and counting and the Japanese HII-B launchers, four cargo flights to the ISS and no failures.
NASA is not in the rocket business, it's in the space business
Nice bit of flim-flam about how lean mean SpaceX will fix the problem real quick once they figure out what happened not like stodgy old NASA who are, you know, the people paying SpaceX to fly the CRS missions to the ISS.
NASA doesn't build or fly rockets, it buys launches from manufacturers like ULA (Boeing and Lockheed) and SpaceX. The big kerfuffle about the Shuttle disasters was that people were killed and determining exactly what went wrong in the operational sense was what took the time -- the true causes were known a day or two after they happened.
This failure is going to put a crimp on man-rating the Falcon design which was otherwise moving along smoothly and it's also going to make the US DoD and No Such Agency a bit more wary of offering SpaceX contracts to fly their pricey military and spy hardware, just after Elon managed to wedge his way onto that gravy train.
Mobes on shinkansens
The entry/exit door areas at the end of shinkansen carriages are where folks go to to make and receive calls on their mobiles. There's a sliding door between that area and the rest of the carriage to keep the noise down. Loud ringtones get the Silent Walk Of Shame treatment as the offending salaryman scuttles off to the end of the car to deal with his call.
The really weird thing in some shinkansen trains is the smoker's aquarium room, a glassed-off compartment filled with grey smoke and (presumably, it's difficult to make out sometimes) people puffing away on their cancer sticks.
Re: Fast, but not that fast
The French steel-wheel speed record was achieved with a special "racecar" train set and it ripped up the track ballast and damaged the overhead as it passed. In comparison the Japanese maglev record train was unmodified from the trains that have been carrying out test runs for the past few years and it didn't damage the track while carrying over fifty passengers.
The same train raised the record from 581 km/h to just over 590 km/h last week, this week it got over 600 km/h. It looks like the maglev people are planning to raise the train's speed in 10 km/h steps until they can't go any further for some reason -- aerodynamics, instability, whatever. I've seen claims that they want to get up to 900 km/h eventually but I take that with a pinch of salt. The planned top speed for commercial service beginning in 2027 is 500km/h to start with.
The end-game in Go has many fewer legal moves as much of the board is occupied by placed stones, safe areas which can't be invaded and areas already given up as lost by one side. This is a lot simpler to analyse forward to a winning position than the mid-game position. It's also very useful for evaluating the result of ko fights and the number of points each fight accrues to the players.
Crazy Stone and other computer Go programs like Zen aren't a serious threat to the professional ranks, yet. Pros have lost games to programs, yes but only when offering large handicaps -- 4 stones is equivalent to forty points head start. In chess that would be like spotting the other player a queen and a bishop.
The KGS 5 dan rating that Crazy Stone has been assigned is not a pro ranking, I've seen folks say that the KGS amateur ranks are about +4 over real pros so Crazy Stone is maybe as good as a shodan (1 dan) pro. Maybe.
Re: finger trouble.
It's more like the cleaner or someone in the office decides one evening their home 'puter could do with a nice big media hard drive upgrade and next day the NAS falls over with a "drive missing" error.
My old toolkit for desktop support in offices included a box of tamper-proof screws and the requisite screwdriver bits to secure machines. It didn't stop memory and HDs going walkies (and even a CPU in one instance) completely but it slowed the tealeafs down a tad.
Re: How is this "3D NAND" any different from stacked dies?
This 3D NAND process isn't stacking individual lumps of silicon, it appears to involve layering insulating material and new semiconductor substrate on top of a previous layer, etching and metallising that substrate, providing interconnecting vias through down into the previous layer and then doing it again as many times as they can get away with for decent device yields.
Why switch to non-fissile thorium when uranium is cheap and abundant, now and for at least the next fifty years and we already have a lot of experience using it to fuel existing reactors and their replacements currently under construction? Of course at the end of that time we can reprocess the spent fuel that's in store and fuel another generation of uranium reactors for fifty years and more from the "waste". If all else fails there are proven techniques to extract uranium from seawater, cost estimated to be about USD 300 per kilogram.
Thorium is difficult to use as a nuclear fuel. It's not fissile, it needs to be converted in a high-temperature high-neutron-flux breeder cycle into U-233 to make it into a fuel that can produce energy by being fissioned. The theory, and it is only a theory, is that this can be done in a continuous process. Further theory suggest it can be done in a molten-salt stream but it's never been achieved in the real world, just in Powerpoint slides and at TED talks.
No, the molten-salt test reactors that were run at ORNL and elsewhere fifty years ago didn't use thorium, they used U-233 and later U-235. Some reactors have used thorium, usually pebble-bed designs which were not a great success (see the German HTHR-300 for an example) and they were mostly fuelled by U-235 and in some case Pu-239/240 with a little added thorium to season for taste.
PRISM = Powerpoint
There's a lot of paper exercises, grad student TED talks and general blue-sky bullshit around in the nuclear biz. PRISM and all the other wonderful Great Ideas all suffer from one fatal flaw though; nobody's building any of them. There's research money around, a few million dollars here and there, enough to fund some computer modelling or materials testing and pay for some PhDs but no-one is bending metal and pouring concrete on the GE PRISM or any of the other glossy-brochure reactors in the public eye.
What IS getting built right now around the world is nearly all light-water reactors, GenIIa and GenIII designs based on fifty years and more of operation of hundreds of GenII reactors because the operators aren't interesting in advancing the technology but in generating cheap electricity. There are a few, a very very few experimental power reactors being built or commissioned like the Russian BN-800 fast spectrum reactor and the Chinese quasi-modular HTR-PM pebble-bed design but Russia and China are stamping out cookie-cutter LWRs by the dozen, the Soviet-derived VVER family and the Chinese CPR-1000, a home-grown version of the Westinghouse AP-1000 because they and their customers need the electricity.
Re: Thorium Nuclear Reactors
That's great, 500lbs of plutonium from a LWR in a year! Problem is it's a mix of Pu-239, the good bomb-making isotope and Pu-240 which is not fissile and which prevents a bomb going off "right". It's also intensely radioactive and self-heating to point where a bomb core would be at a temperature of several hundred degrees, not quite a dull red. It also takes a big expensive processing plant to get the plutonium out of spent fuel, lots of power and special chemicals, technicians and engineers. It's easier to make a few hundred kilos of pure Pu-239 for a small nuclear arsenal using a dedicated breeder reactor the way, well, everybody with any sense ever did (I except the North Koreans from this august assemblage).
The US has about a hundred tonnes of weapons-grade plutonium in storage at the moment, Britain about 70 tonnes, Russia lots and lots. The nuclear weapons states don't want or need more bomb-grade plutonium as they've got nothing they can use the surplus for but they've still got to keep it safe which costs money and effort. The non-nuclear states such as Vietnam tend to buy in their nuclear installations as turnkey operations where the reactor builders (in Vietnam's case, Rosatom) will supply the fresh fuel and take away the spent fuel afterwards.
Re: Value for money?
The 5K display in the iMac has nearly twice as many pixels as the 4K Dell monitor you've just purchased, it's not a small step up in resolution.
The iMac looks like a nice piece of kit but for me and my ageing eyes a 27" display is a little bit small. I'd like a 5K display with a 30"-plus diagonal but I'll probably settle for the Dell 31.5" 4K display as a Xmas present to myself. It helps that the display I've got my eye on has an IPS panel with a good colour gamut, the smaller 28" Dell 4K display is TN.
Re: but where are the 2TB Drives
You can buy spinning-rust 2TB HDDs in a 2.5" form factor but they tend to be thicker than conventional drives and might not physically fit in your laptop. A 2TB SSD would require twice the number of flash chips as the existing 1TB SSD offerings and getting all those chips into a normal thickness chassis (7mm or 9.5mm) seems to be a problem the manufacturers haven't solved yet. There's also heat dissipation to worry about.
Once the chips get denser then you can expect 2TB and larger 2.5" format SSD drives to hit the market. I'm still surprised no-one's released a 3.5" SSD with, say, 16 TB capacity to beat the spinning-rust record holders if nothing else.
Re: 80% within 66m?
I live in a terraced flat in a city centre. A 66m (actually 200 feet in old money) radius from the fibre box near our front door would cover thirty or forty "households", many of them shared flats with four or five students or single folk all of whom hammer the internet day after day as well as shops, guest houses etc. That fibre box isn't the only one in our street, of course. Lots of people in the UK live in high-population-density areas like this.
That 80% coverage figure by BT sounds about right and they've got the maps and infrastructure details to back up their claim. You've got, what, a feeling? Voices in your head? that makes you sure it's bullshit. I'll go with BT in this case.
From this strip
Spent fuel pool depth
Spent fuel pools in light-water reactor buildings are usually a little over twice as deep as the length of the fuel rod assemblies used in the reactor. When refuelling is taking place the reactor is flooded and a "gate" is opened to connect the flooded top of the reactor with the adjacent pool. The fuel assemblies are withdrawn from the reactor one at a time and kept under the surface of the water until they are dropped into a slot in the racks in the bottom of the pool. Later after they have cooled down for a time they are transferred, still underwater into a storage or transfer cask which is sealed and then lifted out of the pool.
It doesn't take much water to block the radiation from a spent fuel assembly after a day or two have passed since the reactor was shut down, a few centimetres will do a decent job of blocking most of it.
Re: So they force him to use Word hmm?
Most publishers want Word documents since that's what their office staffs are used to working with. Same with the writer's agents, copyeditors etc. That doesn't mean the writer has to compose their text in Word, just that there needs to be some kind of output TO Word format at the end of the composition process. That format could be as simple as .txt though or even .rtf as long as Word can swallow it.
Classically manuscripts on paper were submitted in a publisher-specified format, large margins and double-spaced lines for pencil editing notes and corrections, monospaced font such as 10-pt Courier to make word count easy, author name and book title on each page in case the loose paper got floor-sorted, that sort of thing. Old habits die hard in the publishing industry.
Re: Meanwhile, halfway around the world
What's wrong with getting a regular non-white cat and overriding its colour to #ffffff in the CSS?
Apple retail markups
The story I heard from a middleman supplier of Apple kit a long while back was that they frowned on deep discounting or even shallow discounting by suppliers to consumers. Discount too much, too deeply or too often and supplies would dry up and contracts would be difficult to renegotiate. This was before Apple direct sales really took off with the internet and high street iAquariums though.
Storage costs money
Liquid air, flywheels, capacitors, hamsters in wheels, they all cost money to build and run, they waste electricity in conversion and reconversion losses and they don't add any new generating capacity, just make the fluctuations and sudden peaks in demand a little smoother. Consumers are already up in arms about the bottom-line cost of energy, making it more expensive per kWh isn't going to be looked on favourably.
Sorry but the Juno probe wasn't going to be powered by "nuclear waste". Pu238 is the preferred fuel for radioisotope thermal generators (RTGs) for a lot of reasons and it's not found in other than trace quantities in spent nuclear fuel. It's actually manufactured by a complex and expensive process involving exotic chemical processing of spent fuel to extract neptunium-237 and exposing that in specialised research-style nuclear reactors to breed it into Pu238. The problem is that the research reactors in question are being shut down as they age and/or fall foul of tighter operating restrictions such as not using highly enriched uranium fuel, and nobody wants to cough up the money to build new ones to modern safety standards. This is also affecting the nuclear medicine supply chain.
Storage costs money
Assuming you have the right kind of geography with high and low reservoirs close to each other and lots and lots of water available, pumped storage costs about £200 million per GWh to build, a few million a year to run and it doesn't generate any electricity in itself so it's on top of the cost of renewables, not a replacement or an offset. It makes intermittent renewables more useful, their energy can be stored and released on demand rather than use it or lose it but storage also wastes a lot of that energy in the store and release cycle.
Dinorwig can store about 8GWh, the other big pumped storage station at Cruachan in Scotland is about the same. Together they can supply about 2GW maximum for a few hours or about 10% of our lowest consumption (midsummer night time). During the winter our demand peaks at about 50GW so we'd really need at least a dozen more Dinorwigs to make a dent in the supply situation for those times, or freeze to death in the dark.
Modern designs of nuclear reactors like the ones licenced to be built in the UK can all reduce output ("swing") quite readily if they, for some weird reason, produce "too much" power. Would that we were facing the problem of "too much" power...
As it is the existing British reactors are pumping out maximum base load power as much of the time as possible since the fuel cost is mind-bogglingly low and the grid is topped up with gas and coal with wind adding a small amount on top when the conditions are favourable.
Samsung on Youtube
Samsung put a Youtube ad up several years ago where their engineers RAIDded 24 SSDs (probably SATA-2 devices) and got 2 GB/s sustained throughput.
I have a Bernoulli 10MB drive on the sideboard, complete with a couple of cartridges. It'll come in useful someday.
I have an old Palm E running Coreplayer pumping out ambient "seashore" noise to a pair of cheap speakers at the head of my bed. Helps me get off to sleep at night.