Feeds

* Posts by Chemist

1852 posts • joined 24 Mar 2010

Kit steals Mac login passwords through FireWire port

Chemist
Silver badge

What !

It keeps plain text passwords in memory - good grief !

1
3

Sorry, time travelers, you’re still just fiction

Chemist
Silver badge

There's nothing in Relativity..

that denies FTL velocity. The only restriction is that an object with mass can't accelerate to c without infinite energy. On the other hand anything traveling FTL can't DECELERATE to c without an infinite energy.

0
0
Chemist
Silver badge

So a sort of

Great Program Counter in the Sky ?

Or for the hyperspace believers just use a JMP instruction

0
0
Chemist
Silver badge

"how does gravity operate..."

From General Relativity mass/energy bends spacetime - anything moving in spacetime follows the bend.

It was the first test of General Relativity.

The more mundane one happens everyday as GPS clocks are set to correct for various time mangling effects due to velocity/gravity

2
0
Chemist
Silver badge

"scifi writers came up with the concept.."

I think you'll find relativitists came up with the concept of wormholes

1
0
Chemist
Silver badge

4-velocity

Light moving at c in vacuo doesn't experience the passage of time at all as far as I'm aware all it's motion is in space.

Google 4-velocity or 4-vector for an explanation

0
0
Chemist
Silver badge

"but by the 13th century, ..."

Quite a lot of people would have thought it was flat, or more like not thought about it at all. They were more concerned with witches, demons and such.

Any sailor who had left the sight of land and returned and anyone who had observed them would have a fairly good idea that it wasn't flat, as would many well-read people.

2
0

Higgs Boson hiding place narrows

Chemist
Silver badge

"Any decent scientist will tell you that Einsteins theory of relativity...."

Any decent scientist will tell you that every theory is provisional and any hard negative evidence is likely to be its death-knell.

However Relativity isn't at that point - all tests show agreement. No rival theory matches it for the depth or quality of its experimental verification

0
0

Russia’s space telescope in orbit

Chemist
Silver badge

Load of tosh

There's always been science and technology - the only difference now is the rate of progress and coordination of information combined with formal education

We'd never have become a more 'advanced' society without it.

1
0

ARM to wrestle quarter of laptop market from Intel

Chemist
Silver badge

Re : A skeptical dreamer

So all those Androids and iPads are waiting for a Windows to run on them to become usable ?

0
0

DARPA project seeks immortality, suspended animation

Chemist
Silver badge

Everyone knows that ..

if you become immortal you have to go round the galaxy insulting everyone in ALPHABETICAL order.

Thanks Douglas for that beautiful twist on the immortality theme

2
0

CERN 'gags' physicists in cosmic ray climate experiment

Chemist
Silver badge

"Carbon dioxide is essential to life on the planet."

Low level are necessary but high levels are lethal - the argument is about the middle ground.and it's possible consequences.

It's rather like saying iron is a good thing full stop but not mentioning that swords, guns and tanks are built from it

6
3

US patent reform jumps through second hoop

Chemist
Silver badge

Re : Prior Art

It doesn't stop prior art invalidating a patent.

0
0
Chemist
Silver badge

"Invented first" is a pain

It means having to document everything you do AND get someone else outside your immediate project to witness that you've done it AND that they understand what you've done. In drug research it can mean someone signing and understanding EVERY page of a lab notebook.

1
0

ANU plasma thruster gets research boost

Chemist
Silver badge

talent upset you

IGNORANCE is pure bliss (in your case) !

0
0
Chemist
Silver badge

If you are scientifically trained..

you will know that although many areas of science have unknowns and therefore contain possibilities other areas are more constrained by extensive experimental evidence.

So Special Relativity gives the kinetic energy of an object moving at high speed which for the sort of velocity necessary for even a forty year trip to the nearest star is absolutely colossal and that's per tonne. Plasma drive or not that energy is needed and the mass of fuel/engine also needs colossal energy to accelerate it.

Any conjecture about FTL/warp rightly is in the realms of SF as there isn't a jot of evidence and only highly dubious theories.

SF is great, the moon landings were great (I was 18 at the time ) but too many people seem to think ANYTHING is possible. It isn't !

1
0

Fridge-sized war raygun for US bombers gets $40m

Chemist
Silver badge

"phase change heatsink"

Er, ice, or bucket of water > steam ??

1
0

Back to gaslight, coal and steam power - it's the future

Chemist
Silver badge

If you want to grow plants

just release it to the atmosphere.

It's not that CO2 doesn't get converted to carbohydrates in plants it's the RATE of CO2 production that's the problem with the current use of fossil fuels. Not enough growing area to absorb it all. Putting it into a greenhouse only helps a little if at all and you need to make the glass.

0
4

DARPA issues call for notions on Starship-for-2111 plan

Chemist
Silver badge

This is rubbish..

Absolute rubbish.

Don't believe all you see on the Internet and esp. youtube

0
1
Chemist
Silver badge

Trouble is ..

The vulcans already have a patent.

0
0
Chemist
Silver badge

"Old physics will do "

And you are going to stop at the other end how precisely ?

0
0
Chemist
Silver badge

But

0.99C is ~14000 1000MW power stations for a year for 1TONNE at 100% efficiency.

Everything else is (WILD) speculation

0
1
Chemist
Silver badge

You need to calculate the energy

At 0.99C the relativistic kinetic energy is ~5E20 J PER TONNE - that's a staggering amount of energy. So you need (at least) that to accelerate to 0.99C and then again to decelerate.

All this assumes a propulsion system that is efficient and isn't totally burdened by it's own mass

0
1
Chemist
Silver badge

From "Hitchhikers..."

"In Relativity, Matter tells Space how to curve, and Space tells Matter how to move.

The Heart of Gold told space to get knotted, and parked itself neatly within the inner steel perimeter of the Argabuthon Chamber of Law"

2
0
Chemist
Silver badge

"if you have a powerful enough engine."

That's the first requirement even if all the other problems can be overcome. To get to the nearest stars in a 'reasonable' time (~40 years say) the energy requirements are truly awesome.

I calculate for 1 tonne moving at 0.1C ( ~40 years) the kinetic energy is ~4.5E17 J . That's equivalent to 14 1000MW power stations for 1 year.

You'd definitely need a BIG power source which would add it's own weight.

Solving the big energy question is a necessary step. (unless there really is some new physics as yet undiscovered)

0
1

Creationists are infiltrating US geology circles

Chemist
Silver badge

Incest

With enough inbreeding you get genetically very similar people who are then all susceptible to the same environmental challenges ( infectious diseases for example )

0
0
Chemist
Silver badge

"just why the planet is 70% water covered."

Well call me presumptious but I'd assumed it was down to the amount of water on the planet and the topography + some feedback connection with above sea-level ice.

0
0
Chemist
Silver badge

" and nights of rain it would take to cause the entire globe to be inundated"

A simpler question would be where would the extra water come from and indeed go to afterwards.

7
1

Antimatter hangs around at CERN

Chemist
Silver badge

Just think about it a little..

*Even* if antimatter was repelled by gravity how are you going to contain it so that it doesn't interact with the matter you want to fly through. The containment is going to be extremely sophisticated matter weighing a considerable amount more than the anti-matter.

The idea doesn't get off he ground

1
0

Apple worth more than Microsoft and Intel combined

Chemist
Silver badge

And all 6 of mine...

run Linux

0
1

Microsoft's patents shakedown betrays spirit of Gates

Chemist
Silver badge

"copy someone's OS "

Nonsense !

0
0

Skype reverse-engineered and open sourced

Chemist
Silver badge

Why by hand ?

Hi Lars,

Did you have no dissassembler in the 1970s ?. One of the first 'big' FORTH programs I wrote was a 6809 dissassembler which only took about 8K od source code including ~ 4K of data table. Given that the 6809 had anything up to ~6000 op codes ( it had multi-byte op codes for some addressing modes before anyone asks ) depending on how you looked at it I thought that was quite neat. Mind it ran a tad slowly but served it's purpose.

1
0

Mac trojan evades Apple's brand new security fix

Chemist
Silver badge

Just trying to emphasise the point...

that even switching desktop sessions is easy. It's still the same amount of typing - username & password

0
0
Chemist
Silver badge

Don't even have to log out.

Certainly on my OpenSUSE machines it's just switch user and then Ctrl-Alt-F7 or 8 ... to get back to the previous session

0
0

Official: Apple to float iCloud on 6 June

Chemist
Silver badge
Joke

I think...

iCon

0
0

Linux 3.0 all about 'steady plodding progress'

Chemist
Silver badge

KERNEL PANIC ??

I've been using Linux since 1.2 and I've not seen a Kernel Panic for years certainly since before Suse 5.0

2
0

Win7 machines harder hit by infection as VXers change tactics

Chemist
Silver badge

Re : "more immune"

I take your point however immunity does in fact vary, individuals immune response varies as does the amount of infectious agent they are subjected to. So generally a person can't be said to be just immune or susceptible but will form part of a distribution when the population as a whole is measured.

0
0

Glass aeroplanes and iPads on the way, say boffins

Chemist
Silver badge

Glass is one of the names used..

for these disorder states of matter. Amorphous could also be applied. Most non-crystalline materials are not transparent. One of the routine challenges most organic chemists face when synthesising new compounds is to convert an often mass of sticky gum or stiff glass into a crystalline material.

1
0

Elite coder readies £15 programming gadget for schools

Chemist
Silver badge

What !

Early 8-bit computers had 8K BASICs or smaller. My home-brew FORTH system will run a 4K FORTH system with ~8K RAM and 1.5MHz clock on a 6809.

8-bit PICS are quirky but plenty powerful enough and they are available in 0.1" pin packages that can still be easily hand-soldered.

1
0
Chemist
Silver badge

PICs

http://www.microchip.com/

Buy from Maplin or RS

Cheap, lots of tools. I mostly write assembler. I've even set one up to emulate a serial port on my homebrew 6809 FORTH machine

2
0

DARPA, NASA look to spawn STARSHIP enterprise

Chemist
Silver badge

Have you a reference ...

for this ?

1
0

Is there anything to find on bin Laden's hard drive?

Chemist
Silver badge

Try...

http://www.opencores.org

0
0

Intel debuts '3D transistors' with 22nm chip recipe

Chemist
Silver badge

And indeed I started electronics using them..

but getting much below 22mm proved rather difficult !

4
0

Natty Narwahl: Ubuntu marine mammal not fully evolved

Chemist
Silver badge

openSUSE

Well said - never a moment's problem (running on 6 quite different machines here)

0
0

ET, phone back: Alien quest seeks earthling coders

Chemist
Silver badge

"The sender may have given us a 24hour burst before pointing at another star"

and if we'd replied would they would have had to wait up to a gazillion years to receive it

0
0

Lasers set to replace spark plugs in car engines

Chemist
Silver badge

They all contain

benzene rings but as you say there's a wealth of variation in their properties and hence carcinogenicity.

0
0

Top-secret US lab infiltrated by spear phishers – again

Chemist
Silver badge

Certainly my experience at various research labs is ..

that Windows was used by the computer illiterate or for 'corporate ' use (HR, marketing, managers, e-mither ) the hard scientific stuff was done generally on Unix or increasingly Linux.

1
0

Google pours millions into wind power

Chemist
Silver badge

That'd be

~1.9 tonnes diesel -> ~ 5.8 tonnes CO2

1.9 tonnes ~ 2300L

~45 L /week of diesel equivalent to ~500 miles in my Touran

You may be certain that the average vehicle on USA roads is not achieving 50 mpg

1
0

Whitehats pierce giant hole in Microsoft security shield

Chemist
Silver badge

The point about it

was that an attempt on open source was caught quickly because it was open source.

FUD FUD FUD

What a load of apparently wishful thinking ( and paranoia)

0
1
Chemist
Silver badge

This was from 2003 for grief's sake !!

and then it was stomped on VERY quickly.

Is this the best you can do ?

2
0