* Posts by JeffyPooh

1244 publicly visible posts • joined 8 Aug 2007

Tesla vs Media again as Model S craps out on journo - on the highway

JeffyPooh
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Re: From the Battery University

"Where I live -- in the land of hydro-electric power* -- the overnight low temperatures are less than 5°C for 6 months a year."

Where you live, you have a house. Your house is connected to endless grid electric power. This electric power is connected to the electric car to recharge the battery. In other words, when the electric car is parked at your house, it has access to essentially unlimited electric power from the grid.

Why oh why oh why would the car designer fail to provide a grid powered electric heater for the battery pack?

See other post about how to combine good insulation around the battery to minimize heat loss, combined with some thermostatically controlled air ducts (doors) to provide unlimited cooling when appropriate.

JeffyPooh
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Re: Measurement unit?

@Evil Auditor "...it's still not kWh but Ah..."

All the other replies were correct, but failed to address your embedded query about amp-hours.

You are correct that battery capacity has traditionally been rated in amp-hours. But amp-hour ratings are only comparable for a given voltage.

When designing an electric car, the designers are not limited to any particular voltage. They can choose 140 volts DC, or they might choose a different voltage. Higher voltage with the same amp-hour rating fails to capture the energy density. Since nobody really cares about the car designers choice of battery pack voltage, it's much better to define the energy density in terms of watt-hours (watts being volts time amps, for those that didn't know that already).

Question for the crowd - how many litres of gasoline contain the same energy as "85 kWh" ?

JeffyPooh
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Re: Cold weather and cold batteries

EvilGav 1 asked: "...what do we do about the excess heat we have when the temperature is at the other end of the scale?" having skipped over the cooling concept already described thus:

"Add controlled air ducts for infinite air cooling when required..." (<- copied and pasted from my previous post),

In other words, a thermostat. Controlling the air ducts (with tight little doors). Thermostatically controlled air ducts just a little bit like those in an air cooled engine found in a 1957 VW Beetle.

Good insulation to keep the battery pack warm with insignificant power, but (as was already described) open some air ducts if it needs to be cooled.

Rocket Science this is not. Sometimes I wonder about you humans.

JeffyPooh
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@Michael B. - BBC's "voiceover" ?

You mean one Jeremy Clarkson? He's a bit famous to be referred to as an anonymous voiceover.

JeffyPooh
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Cold weather and cold batteries

Perhaps I'm just naive and innocent, but it seems to me that battery temperature problem is (for the non-extreme cases) such a trivial problem to solve. Wrap the battery pack in two inches of super insulation. Add controlled air ducts for infinite air cooling when required, otherwise R2000 The Better Built House.

Once rolling, use waste heat from the drive train to keep the battery pack toasty warm at the ideal temperature.

When parked and connected to the coal powered national grid, feel free to use a wee feisty heater as required to help keep the battery pack toasty warm at the ideal temperature.

When parked at the mall without AC power, make a calculated judgement to drain off a wee bit of battery power the battery pack toasty warm at the ideal temperature where the benefit of increased range outweighs the detriment of decreased range. The R2000 should only require a few watts. A solar panel in the roof might make up the difference.

If you're parked at an Alaska airport in the dead of winter for six weeks, forget about it. You'll be buying a new $40k battery pack anyway.

Heat is a trivial thing to conserve with good thermal insulation. Any car, even electric, should have plenty of waste heat.

JeffyPooh
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I can reproduce the electric car experience. Never, never ever, fill-up your car's gasoline tank past the one-eighth mark. Bring home a three gallon jerry can of gasoline so that you can 'recharge' at home; but you'll also need a funnel with a bottom opening about 1/64 of an inch diameter so that it takes an hour to empty the jerry can. Only fill-up on the road if the gasoline station's zip code is a prime number (following the three gallon limit and the tiny funnel). Enjoy.

Register reader Ray revs radio-controlled Raspberry Pi race rover

JeffyPooh
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For the love of gawd...

...tidy up that wiring. :-)

$195 BEEELLION asteroid approaching Earth

JeffyPooh
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The Native Population on 2012 DA14

It's simply loaded with proto-people, according to that guy in Sri Lanka.

Dish boss on ad-skipping service: 'I don’t want to kill ads'

JeffyPooh
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It's not "The End of The World As We Know It"™

My PVR is made by EchoStar (Dish). You push the button and it skips ahead about 29 or 30 seconds at a time. So you get to see each and every commercial; for about 800 milliseconds each. Perfect.

99% of the time the ads are obviously the same old boring underarm deodorant ads, so I keep pressing Fwd. But if I happen to spot (for example) a 4Matic Mercedes driving across a frozen lake, then I'll press the 10s Back button to find the beginning of the ad and I'll watch it; perhaps even twice. Volkswagen ads are also typically worth watching.

I save time. I'm not bored. I still see the ads for products and services that I might actually be interested in. Win-win-win.

No downside, unless you're thick.

LibreOffice 4.0 ships with new features, better looks

JeffyPooh
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Re: Slowly closing the gap with Microsoft Office?

"Ten thousand column!? Somehow I get the feeling that anyone running near that many columns is using the wrong software."

Perhaps they're using a massive spreadsheet to perform the ERP functions. If they can avoid SAP's effectively 100% profit tax, then it might be worth it. Hell, I'd rather manage a corporation using a single NAND gate and a box of delay lines than sign up for the massive SAP money grab (now 30% of all European IT $£€, for about 0.1 ppm of the software LoC).

Big Windows updates may ship this summer – and every summer

JeffyPooh
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Re: Business model

I think it was *Apple* that invented the concept of omitting Copy & Paste from their UI.

JeffyPooh
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Recommendation...

They may decide to downplay major releases. But I recommend that they trumpet the next or later release that will (inevitably) back away from the Metro interface fiasco. It may be slightly embarrassing for them to highlight it, but I've decided that I'm simply not buying Windows 8 - nor any hardware that includes it. So make sure I get the memo when they're back to their senses.

Why you need a home lab to keep your job

JeffyPooh
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How about an Arduino and a laptop?

Maybe a Raspberry Pi with a handful of accessories.

Boffins find 17,425,170-digit prime number

JeffyPooh
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Re: My imaginary number is....

Y'all might enjoy this fascinating article:

http://www.scottaaronson.com/writings/bignumbers.html

Microsoft 'touches 16k shop workers' to flog Windows 8 hard

JeffyPooh
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"...and the 'ambitious' user interface design."

You spelled 'rubbish' incorrectly.

It's not just that I don't want Win 8 in my life, it's that I'm going to actively avoid it. Maybe Win 10 will return to normal programming.

Antivirus update broke our interwebs, howl Win XP users

JeffyPooh
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Kaspersky Lab - well deserved failure

Their 'Confidence/Competence Ratio'™ slightly exceeds unity (dangerous territory). This sort of embarrassing failure at Kaspersky Labs was perfectly *inevitable* (and still is).

BlackBerry 10: Good news, there's still time to fix this disaster

JeffyPooh
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Re: Homescreen

"...an interrupt-driven button..."

A hardware button, as you hinted connected to a hardware interrupt line, allows the CPU to go to deep sleep. Presumably this allows lower stand-by power consumptions than monitoring the touch screen for a certain unlock swipe gesture.

I've always assumed that Apple figured this out from Day 1, and that a hardware button is a perfectly logical design decision.

Space Shuttle Columbia disaster remembered 10 years on

JeffyPooh
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Re: @TheFunkyGibbon: Like A Candle In The Wind....

" 'Challenger' never exploded, it was torn apart in by aerodynamic stresses when the booster knocked the stack out of alignment..."

...at which point the Challenger's external fuel tank was ruptured, its contents caught fire and it created a huge fireball that resembled an explosion. So you are correct. But it sure looked like an explosion.

'Gaia' Lovelock: Wind turbines 'may become like Easter Island statues'

JeffyPooh
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Cost of wind turbines

The next obvious step is to have the Chinese start manufacturing the wind turbines; that should drop the price by about 75%. It would also reveal the out-of-order approach... ...The Chinese would burn coal like mad to power the massive windmill factories.

Obviously humans need to stop burning coal....now. A new nuke plant takes 20 years from conception to power-up. Natural gas is the *obvious* transitional fuel for the next 30+ years; starting *now*.

Google offers $3.14159 MILLION in prizes for hacking Chrome OS

JeffyPooh
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Rip off

What happened to the missing $2.65?

Apple releases iOS 6.1, adds LTE carriers, tweaks security

JeffyPooh
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Re: THEY RELEASE THE UPDATE

"...Umm, you do know that 'all iDevices' as you used it has a fairly narrow definition?"

We have some old devices in our household (in the bottom of drawers); they've all been replaced with newer devices. Apple does *far* better than almost anyone else in this regard.

Truth be told, if you use these devices intensively and actually pay attention, the many SW bugs become visible.

Dead Steve Jobs tried to KILL Ashton Kutcher from beyond the grave

JeffyPooh
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...first human to be able to "feel his pancreas is out of whack"

He probably had 'The Trots' and confused it with Death Warmed Over.

Boeing 787 fleet grounded indefinitely as investigators stumped

JeffyPooh
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Remember the Sony Li-ion batteries with the internal short circuits?

Deja vu?

JeffyPooh
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Re: What a mess...

Not really. If Boeing issued an ICD (500+ pages for something like this), then each sub could create their own design that should be perfectly interchangeable. Allow time to bring practice into alignment with this theory.

JeffyPooh
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Re: @LarsG - - Grounded indefinitely

Batteries used in Aircraft ELTs (lithium primary cells) are often not permitted to be shipped by air. Think about it.

JeffyPooh
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What a mess...

Should've had dual-redundant vendors for that particular LRU.

Oh well, at least it's not software, right? LOL.

Samsung demands Apple's iOS 6 source code in patent case

JeffyPooh
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Maybe Samsung's code review would help Apple fix a few of their stupid bugs

Posted from my imperfect iPhone.

Meet قلب, the programming language that uses Arabic script

JeffyPooh
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Re: The point of this is?

"It's just a translation after all."

Thank you. You saved me the effort of typing in those exact words.

{checks calendar, discovers it's 2013} I would have thought that development environments would have had language switches by now. Being so perfectly trivial and obvious. Every time I scratch the surface I discover yet again how primitive you humans really are. I think you need more than seven billion just to finish up the obvious loose ends.

Will someone translate (port) this new language to English script? It might take a day or two.

Wad of BlackBerry OS 10 pics 'leaks' from RIM's inner circle

JeffyPooh
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Re: PlayBook - updating to OS10 - how many legacy apps will work out of the box?

Thank you.

JeffyPooh
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PlayBook - updating to OS10 - how many legacy apps will work out of the box?

My PlayBook has about a hundred apps. Anyone (aimed at developers with advanced copies) know how's the support for all the legacy apps? Assume 'abandoned' apps that would not be updated for OS10.

Also, the Android apps will still be supported I assume?

TIA.

Brit 2.5-tonne nuke calculator is World's Oldest Working Computer

JeffyPooh
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"Oldest Working Computer" - stop on exception

http://en.wikipedia.org/wiki/Human_computer

Any of the elderly (*human*) "computers" still "working"?

Greenland ice did not melt in baking +8°C era 120k years ago

JeffyPooh
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Re: it's 42

The famous "42" is actually an approximation of 41.9897682229666...

The Adams cosmological constant is related to the Fine Structure constant as follows:

a^-1 = 137.035999084... = 1 + (e/2)*(sqr(2)+Gr) + (π*Adams) [exactly]

Where e = 2.78128...; Gr [golden ratio] = 1.618...

I hope this helps.

Review: Infiniti M35h hybrid sports saloon

JeffyPooh
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Top Gear

"Hey, how's your Datsun?"

Optionally, "...with a Renault engine?"

Japanese boffins tout infrared specs to thwart facial recognition

JeffyPooh
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Better concept follows...

Hat. Brimmed with small, physically small, high power IR LEDs. The LEDs are invisible to the naked eye, they look like beads. To a solid state camera, they're overwhelming. Flash the LEDs on-off at a rate that will confound the autoexposure time constant (on the order of 500 ms, need to experiment). Camera will be blinded enough that facial recognition would have a chance.

Side benefit is all the security camera folks being driven insane. Rentacops running through the malls, looking for someone with a flaming hat.

Global mercury ban to hit electronics, plastics, power prices

JeffyPooh
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Eating ~14 cans (169g) of tuna at 0.5ppm Hg = eating one CFL Bulb (~1mg of Hg)

Yummy.

'End of passwords' predictions are premature - Cambridge boffin

JeffyPooh
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Make the Trap-Door function a lot slower

Make the trap-door function a lot more computationally intensive, so that it requires N seconds to execute on today's hardware. N is chosen to be not very noticeable to the users (maybe 2 or 3 seconds), but enough to massively slow down the dictionary attacks (by orders of magnitude) for a few years.

It might be as simple as repeating the existing trap-door function X times, where X can be incremented (decimal place moved) every few years to keep the timing at several seconds.

FAA grounds Boeing's 787 after battery fires on plastic planes

JeffyPooh
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Re: The problem in this case...

Maybe they could have a suppressive agent wrapped around the battery pack. Something that would be the chemical equivalent of dumping boron into a nuclear reactor. If the battery gets too hot and melts, it melts into the carefully selected agent that calms it all down. Hopefully they don't require the battery to restart at that point. Maybe there should be a primary cell backup.

JeffyPooh
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Re: Re. An eco friendly solution

Ni-MH reliable?

Granted, better than NiCd, but Li-ion has been a big improvement.

Bloke blasts Sprint for fingering his home as phone thieves' den

JeffyPooh
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The so-called "triangulation" algorithm is not as sophisticated as you might think

My iPhone uses cell phone tower "triangulation" for the short time before the alternate methods (wifi database, and then GPS) kick-in.

The so-called "triangulation" algorithm consistently picks the *exact same location* (never varies). This initial location fix appears to be some sort of very primitive mathematical average of the location three nearest cell towers. The algorithm obviously does not use signal strength - if it did, then one would expect some inevitable variation based on random conditions (seasonal, multi-path, you name it). The location never varies. It's a simple and stupid-as-a-tree-stump algorithm.

I suspect that if I built a house on that exact location, then I might find myself in the same sort of situation as Mr Dobson.

He has my sympathy. PS: I like the sign idea.

Soot forces temperatures more than thought: AGU

JeffyPooh
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Re: Aw fiddlesticks!

Jeremy Clarkson is paid more in ONE WEEK ($467k/week) than the President of the USA is paid in one year ($400k/year). Obviously Mr. Clarkson's opinions on AGW, etc. must be given more weight. He traditionally hates diesel powered vehicles, so he's a man ahead of his time (again).

New tool jailbreaks Microsoft Surface slabs in 20 SECONDS

JeffyPooh
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Re: The other shoe dropping...

They (the malware authors) don't "change the OS", they append the Root Script + Malware to something just outside "the OS". The implications are huge, and are perfectly predictable.

JeffyPooh
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Did someone actually adopt that position?

"...The list of instructions to follow is actually way beyond most device owners. Most of them won't even know what the VS debugger is, let alone how to conduct a remote session. Then configuring trust levels in memory... yeah, SOOOOO easy. ..."

Whoever adopted such a position needs to get a brain and have it installed. It's right up there with some of the most dim-witted conceptual positions ever.

Complex instructions can be translated into scripts. It takes a few days or perhaps a week or two. It's inevitable.

Then ANYONE can 'click-click'.

Duh.

JeffyPooh
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The other shoe dropping...

The article mentions that running to rooting script opens the OS to malware.

Duh - the malware authors could copy-and-paste the rooting script into the top of their malware. Does the user have to crank a handle for twenty seconds while the rooting script runs?

The duh-obvious implication here is that this OS is not as secure as they claimed, because arbitrary malware (written next month) can be executed on the stock OS - simply by incorporating the rooting script into the malware. Duh.

Making apps for touchscreen mobes? YAWN. Try a car instead

JeffyPooh
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Ford pre-approval works how?

"Ford also insists that it must approve any application that wants to integrate with one of its cars before the software is submitted to the respective mobile app stores."

How on Earth will this be enforced? Especially with Android. Smells like a meaningless statement.

Buying a petabyte of storage for YOURSELF? First, you'll need a fridge

JeffyPooh
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I've bought one already...

I've bought one already, but it turned out to be only 888.1784197 TB due to the usual 1000/1024 marketing confusion.

"First, you'll need a fridge..."

Fail - I think (assuming that you intend to install the 1.0 PB array inside the fridge for cooling). A typical "fridge" would probably be overpowered by (on the order of) ~200 watts heat source inside; leaving only the fantastic insulation to melt your expensive array. You'd have much better cooling if you left the fridge door open.

Windows RT jailbreak smash: Run ANY app on Surface slabs

JeffyPooh
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"...unlikely to be something most non-techie users could pull off..."

"The hack is unlikely to be something most non-techie users could pull off as it requires knowledge of WinDbg."

FAIL. Once the inevitable tool is released, then the average non-techie user follows the instructions and goes "click-click". It's ignoring history (e.g. cracking smart cards, ripping DVDs) to think otherwise.

Minicam movie pirate gets record-breaking five years in prison

JeffyPooh
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Hopefully they'll be sent to a prison with regular Movie Nights...

...and a string vocational/educational program including Audio-Visual training - especially Movie Projector Operator, Videography, and Video Editing skill sets.

Canadian astronaut warns William Shatner of life on Earth

JeffyPooh
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"...damped by gravity..." ???

Damping implies some sort of friction or loss. The radiated acoustical energy from the string into the air is almost certainly the primary damping agent. Air pressure on the ISS is held to a normal, Earth-like value - no difference.

If gravity causes damping, it must be a strange tertiary effect. The physical mechanism from gravity to damping is not obvious.

Anyone know?

US military nails 'best ever' Microsoft deal, brags size does matter

JeffyPooh
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Re: $100 per machine per year is a deal?

The proudly claimed "10%" off is noise - I don't understand why anyone would consider that to be anything other than a rounding error..

But putting in terms of $100/year is pretty reasonable.

JeffyPooh
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"...USB-stick..."

They allow USB sticks? OMG!! SECURITY!!! SECURITY!!! SECURITY!!!