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* Posts by Chemist

1853 posts • joined 24 Mar 2010

Virus infects killer US air drone fleet

Chemist
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"What would you rather? Your bank runs its ATMs on Solaris or Red Hat"

ANY time, absolutely any time

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Security by obscurity not so bad after all, argues prof

Chemist
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Obscurity hinders

I rely on a complex 20 digit password for access to my SSH account.

BUT I also use a non-standard port and and only allow access to a very unusual username. Every bit helps even if it just hinders most of the automated probes

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GNOME emits 'head up the arse' desktop update

Chemist
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"I am disappointed with the way desktop Linux is going"

I use OpenSuse 11.4 on 6 machines with KDE and it all just works

Don't know what the rest of you all are doing.

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Firefox devs mull dumping Java to stop BEAST attacks

Chemist
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and.....

Java, Flash, Silverlight ..........

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Stars say relativity still works

Chemist
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"measured speed of those neutrinos"

This has nothing to do with speed of light or neutrinos - it's another test of General Relativity

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Mac malware uses Windows-style PDF camouflage ruse

Chemist
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"executable bits and such won't apply to an Adobe vulnerability"

They will on my system 'cos there's no Adobe.

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Chemist
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"over major swaths of linux"

Well on my OpenSuse installations neither Firefox or Thunderbird will allow executables to run by just clicking and even if you save the file it's set as non-executable so you really have to have a death wish to run an unknown binary. It doesn't matter at all what the extension is.

It is possible to have FF etc set to run interpreted files if you really, really want to.

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Faster-than-light back with surprising CERN discovery

Chemist
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Go

"330m* piece of (tight) string if I pull one end the other end doesn't move until a second later???"

Correct if that's the speed of sound in whatever medium.

That answers both questions.

(should be easy enough try with string - not sure about the neutron star rod)

"What if I pulled on the string at faster than the speed of sound in the string?" - I think you might snap the string.

Common sense or "gut feeling" is not always a good guide to reality. To some extent that's why we need mathematics. Try reading about chaos theory which doesn't deal with the very small like QM or the very fast/large like relativity but still provides some really weird and wonderful effects in the everyday world.

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Chemist
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Sorry - shouldn't really call it chaos theory

Non-linear dynamics is better

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Chemist
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"oes not the string tied around Alice's wrist in Gran Sasso not tug"

NO !

Effect propagates at speed of sound in string or whatever material you use.

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Chemist
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Indeed

how do they know the starting time as these things are so hard to detect or have they got a fast gate in the beamline. No it can't be that as the little devils would just go through it. Must look it up

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Chemist
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"go a bit funny in curved spacetime"

as does Mercury's orbit - which is not predicted by Newton's gravity but is by GR

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Chemist
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From "Hitchhikers..."

"So time flows that way for you " or similar

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CERN's boson hunters tackle big data bug infestation

Chemist
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As a scientist ...

and someone who writes LOTS of terrible code I generally agree.

I have however met some great programmers who were once scientists

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Mars trips could blind astronauts

Chemist
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On Earth with 1G

your head and feet are so far away from the centre of gravity that there is little differential effect. In a small radius centrifuge there is. That would be far from physiological.

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Chemist
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There's also the problem ..

of small radii generating a MUCH greater differential force head to foot so that blood pools in the lower limbs.

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Chemist
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If by that...

you mean a rotating system it has to have a considerable radius otherwise the force acting at head level is considerably different to foot level and can't be compensated for so blood pools in the legs.

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Chemist
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Staying in bed is just lazy and

Gravity is still Earth normal not zero G

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NASA: Beam me up some power, Scotty

Chemist
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I assume that ..

this would still need a mechanism to harness the energy to produce the considerable thrust to get the payload off the ground.

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AMD spills secret to World Record clock speed

Chemist
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Cost

Depends on how much you are buying but ~£4/L - this stuff is used all the time with superconducting magnets. Chemistry NMR instruments hold ~~ 100L

Incidently the LHC uses ~120000 kg or ~~ 650000L I believe.

On another point (although I wouldn't recommend trying this) a stream of liquid nitrogen droplets will bounce readily off the skin without harm due to the boiling liquid being insulated by a layer of gas. As the skin cools however then the problems start. We used to use these types of materials without gloves as any finding its way down a glove could easily produce a nasty burn.

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Sixty-seven WIMPs spotted in the wild, maybe

Chemist
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"basically, anti matter are organised in bubbles around galaxies."

What !

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Blue Screen of Death gets makeover for Windows 8

Chemist
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Should read ...

"Your PC ran into a problem that Windows couldn't handle, and now it needs to restart."

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DARPA wants a working manned starship for $500k

Chemist
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I take it you've already

... deposited your penny and booked your table.

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Chemist
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"it will just take a long time to get there"

How long have you got ?

Even if you can manage 10000 km/sec it will take ~120 years and you'll need >5E18 joules to accelerate to that speed in even a 100 tonne ship

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Windows 8 ribbon entangles Microsoft

Chemist
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"we(IT bods and bodets) are supposed to be the champions of change."

I think you're supposed to be champions of IMPROVEMENT not change

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CERN: 'Climate models will need to be substantially revised'

Chemist
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As far as I know depletion of ozone depends on ..

chlorine derived from CFCs.

The actual reaction is atomic chlorine + O3 -> chlorine monoxide and oxygen.

Unfortunately chlorine monoxide can react with oxygen atoms of which there are some in the upper atmosphere to regenerate chlorine atoms to perpetuate the cycle.

ClO + O -> O2 + Cl

A Non-fluorine containing material such as carbon tetrachloride is also an ozone destroyer.

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Apple wins (another) Samsung Android injunction in EU

Chemist
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I've not gone into the details of this ..

.. but I'd *guess* the patent is for the control of an application by gesture on a touchscreen NOT for the software to implement that. After all it could be by an ASIC or some other means.

Still thin-end of the wedge-ish

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Samsung says Apple lifted iPad from Kubrick's 2001

Chemist
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In the first Foundation novel (~1951)..

Hari Seldon's (?) new recruit, Gaal Dornick, wasn't offered the use of Seldon's 'calcPAD' or something similar to do a quick bit of psychohistory prediction.

It doesn't record if it was a calculator-like device or more like a tablet

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Chemist
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Joke

To use an old joke

Moses was the first man to ride a motorbike too

"For the roar of Moses' Triumph was heard throughout the land " or similar

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Oracle's Sparc T4 chip: Will you pay Larry's premium?

Chemist
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x86

Sure, my workflow would be twin Xeon Linux workstation, if need more grunt x86 Linux farm (1024 nodes), finally supercomputer somewhere.

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Chemist
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The scientific community

are most likely to use Linux workstations, Linux farms or supers running Linux.

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Osun MushRoom Green Zero USB charger

Chemist
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Sounds very high to me too.

It'd be costing ~~£150/year

Coming from the other direction I worked out ~180kg coal (~~equivalent to 630kg CO2) spread over the year would generate ~~30W which still seems high

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Here lies /^v.+b$/i

Chemist
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For the FORTH fanciers

Did you get the feeling that your VLIST flashed before you ?

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ARM vet: The CPU's future is threatened

Chemist
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Plenty of people are thinking about ...

Fuel cells (although AFAIK not chocolate powered ones)

Seriously it's just a device to show how poor the energy density of batteries is compared with (say) the equivalent weight of hydrocarbon. It's only the same as electric car range 50 miles/ diesel car 600 miles

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Chemist
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Chocolate

Assuming that chocolate is ~100% fat & completely oxidized

1g = ~37kJ

So the chocolate equivalent of my 300g laptop battery would be ~~11MJ

That should keep it going a while !

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Canonical ARMs Ubuntu for microserver wars

Chemist
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Reminds me about the time ..

I wrote a 6802 assembler in 6809 BASIC. Took ~2 hrs to assemble ~ 500 bytes

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Chemist
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OpenSUSE 11.0-11.4

I've got 6 machines running various version - very different hardware from dual-core atom to dual core AMD to mCeleron. All have installed/run flawlessly.

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Chemist
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Linux

"Full RHEL6 gcc package takes 3.5 days on SheevaPlug"

You are a star !

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Chemist
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"Now i am running OpenSuse"

Always has been for me !

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Curved light drives boffin one-upmanship

Chemist
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"but space is curved by the various optics"

This is nonsense !

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David Cameron turns water cannons on social networks

Chemist
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"Because there's just no scope of abuse there is there?"

It's only like ANY other legislation

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Rogue character space tripped Scottish exam results

Chemist
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Eh?

From LibreOffice help

"If you decide to enter a number directly as a text string, enter an apostrophe (') first. For example, for years in column headings, you can enter '1999, '2000 and '2001. The apostrophe is not visible in the cell, it only indicates that the entry is to be recognised as text and not as a number."

and it works for me !

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HTC sues Apple in the UK

Chemist
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Re : Why control key

Thanks, I 'd just read it as though it was necessary for SSH.

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Chemist
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"wanting to ssh into Linux systems"

Am I missing something ? - I SSH into my Linux systems all the time without a control key.

Just asking.

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Mozilla and Baidu join battle for the new cloud OS

Chemist
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"between tinkering with the engine and driving to the shops."

Trivial beyond belief !

Having spent YEARS protein modeling, designing PCBs and writing software then all I can say is that internet access is a great addition but NOT the only use for my computers.

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iPad maker to replace 1 million staff with robots

Chemist
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Not all will be sacked ....

for how can any business manage without HR ( now to be renamed Robot Resources) ?

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'Missing heat': Is global warmth vanishing into space?

Chemist
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By the way..

the greenhouse effect increases HEAT retention but heat != temperature. For example the same amount of energy might raise a cubic meter of air by x degrees or a cubic meter of water by y degrees depending on the Specific Heat of the materials involved. The more telling example is that ice at 0C will not change in temperature until sufficient heat has been added to melt the ice.

It just shows how complicated a picture it all is. It looks like it is difficult to calculate the balance of heat in v. heat out. Approximating the resultant temperature change must be a nightmare.

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Scumbags get sneaky with new self-robbery trojan

Chemist
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Certainly..

years ago I had £50000 transfered into my account ( this is when £50000 would have bought a nice 4-bed detached house in good area), unfortunately a few days later it left just as quickly.

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