1655 posts • joined Wednesday 24th March 2010 19:26 GMT
"I was taught that the benzene molecule had two conformations"
No it's planar - cyclohexane has chair & boat conformers. Benzene has delocalised electrons that convert the bonding from sp3 (tetrahedral) found in alkanes to sp2 ( trigonal) so kinked versus planar. The conformation of benzene was contentious for along time but it's been fixed for many decades. It can be seen in any x-ray derived structure that has a benzene ring or derivative.
Download the excellent SwissPDB ( Mac & Windows) and get yourself a structure to view.
I used to wear a white coat but it's been virtual for a while
Wonderful description - I haven't a copy to hand at the moment but the Chancellor's (or what ever he was ) assertion that meta-analysis WAS the only scientific method was priceless.
I also liked the mayor's conclusion that the Chancellor had seems a consumate donkey but was really rather a clever politician in that he's had talks for days with the scientists who were the governors of Terminus but all he'd said and promised when analysed by symbolic logic amounted to nothing - that everything he'd said had eventually been canceled out by other statements and NOBODY (except the mayor ) has noticed. I often think of this when listening to politicians.
you are saying that SGI don't know what they are manufacturing and don't care that customers will notice that it's all snakeoil. Yeah, right.
The fact, by the way, that you can read (any) comments in the kernel source is a strength. Who knows what nightmare is in the Windows source.
From an Intel paper software.intel.com/sites/oss/pdfs/mclinux.pdf
2.6 Linux kernels (which have better SMP scalability compared to 2.4 kernels)
From a MIT paper pdos.csail.mit.edu/papers/linux:osdi10.pdf
"First we measure scalability of the MOSBENCH
applications on a recent Linux kernel (2.6.35-rc5, released
July 12, 2010) with 48 cores...."
"FreeBSD, Linux, and Solaris , and ﬁnd that Linux
scales better on some microbenchmarks and Solaris scales
better on others. We ran some of the MOSBENCH appli-
cations on Solaris 10 on the 48-core machine used for
this paper. While the Solaris license prohibits us from re-
porting quantitative results, we observed similar or worse
scaling behavior compared to Linux; however, we don’t
know the causes or whether Solaris would perform better
on SPARC hardware. We hope, however, that this paper
helps others who might analyze Solaris."
From The Register http://www.theregister.co.uk/2010/11/10/redhat_rhel_6_launch/
On 64-bit x64 platforms, it can scale to 128 cores/threads and 2TB of main memory using one set of kernel extensions and to 4,096 cores/threads and 64TB of main memory. (Not that anyone can build a system with that many processors or that much memory yet.)
These are NOT clusters - I used a 1024 node cluster YEARS ago - these are for single image machines. I notice you've had the same arguments with different people all over the net. They all told you you were wrong.
Think this needs rephrasing
I know what you means but there really is something very wrong with :
"used to prove the link between vaccination and autism."
Re : Yes, planar
Oh sure, there's plenty to be pedantic about. The real measurement is distance and that's on an atomic scale - in this sense a 'molecule' is meaningless going from a molecular weight of 2 for a hydrogen molecule to essentially anything you like such as billions for polymers.
This is all about, let's call them pseudo 2D structures, that have an 'average' thickness in the order of (at the most) atom-atom bond lengths.
Suggest you ..
read what SGI say about it.
" whereas Altix UV 100 and Altix UV 1000 are all about scaling a single system image to a maximum of 2048 cores"
"Because of SGI's collaboration with the Linux community, Altix UV runs completely unmodified Linux, including standard distributions from both Novell and Red Hat"
"western medicine bases it cures on herbs and natural substances"
I take your point but to a great extent it's not true. I spent 38 years doing pharmaceutical research and only worked around natural products on 2 occasions.
"happy to recognise them as scientists if they have PhDs"
Academic qualifications are NOT necessary. Practicing the scientific method, contributing and peer review are the key items.
I've worked with several great chemists, the most notable, who had published widely and was one of the world experts on LogP calculation, did not have a PhD.
For that matter Einstein didn't have too many serious qualifications until after Relativity.
".. label "scientist" would be those who practice ... the scientific method."
Obvious answer is ...
Strange projects but they're up and down about them
String theory never dies
Sorry if you've heard this :
A String Theorist is caught by his wife making love to another woman. "But Darling ", he cried, "I can explain EVERYTHING"
I had one of these recently....
Foreign accent telling me I had serious malware problem and what version of Windows was I using. I told her that all my machines ran only Linux and that she was obviously running a con. She rabbited on and I did what I usually do and left the phone to its own devices for a few minutes. Blow me after I put the phone 'back on the hook' she rang again !
Re : Mathematics
Even more interesting ( or mind-boggling ) is the set of inflation hypotheses that suggest that in the first ~1e-32 s after the big bang our 'universe' expanded from less than the size of a proton to ~10 cm across (or much more). This was an inflation of spacetime - no FTL rules were broken.
The current expansion seems quite staid by comparison
Well I had a Science of Cambridge Mk14 but that was the only Sinclair machine I had. 6809 man for many years with a homebrew Forth system that still runs albeit with a virtual screen/keyboard/disk drive in recent years.
"..this week's strategic suggestion from the very expensive.."
In my area it was ~every 10 years.
"..that Linux users never reboot their machines.."
Oh really. I leave my ultra-low power fileserver on all the time. But if I left the other 6 on I'd pay a fortune for electricity. As someone said it's hardly likely the fileserver is going to go off browsing on its own
Even using Linux exclusively..
.. I don't browse without NoScript
"..yanking dud valves out.."
Oddly enough I was taught Physics by someone who had worked as a graduate student on the Manchester Baby. He had a photo of himself, stripped to the waist, working in a room stacked with chassis. No A/C of course and precious little ventilation
"..eliminating the need for hiring cars or using taxis.."
So you think that the real cost of hauling a tonne+ of car by train will be cheaper than a taxi ?.
"...have to be overhead lines like a real bumper car..."
Overtaking would be tricky !
"is there a particular reason generic hydro....."
Only that the high capital costs are not being serviced when the generators are off I think
"8bls of gas to a gallon, even adding air to the mix, does not equal 19lbs of CO2"
I'm afraid it does.
In more sensible units a mole of octane (C8H18, 114 g) burns to 8 moles of CO2 (352 g) and 9 moles of water (162g) so your 8lbs of petrol will give 24.7 lbs of CO2.
On the other hand the green credentials and economics of electric vehicles are extremely dubious
"The craft's main special sauce is its hydrogen-powered generator, reportedly based on a fairly normal combustion engine, which supplies power for both propulsion and payload."
Main puzzle to me is how they store the hydrogen. If it's cryogenic, which I assume it has to be, does the boil-off rate match the consumption.
"'on arse most of the day'"
All the more reason to have sufficient exercise if you do have a sedentary job. Even some quite intelligent people think that exercise is merely an aid to loosing weight whereas exercise, reasonable weight and diet are all independent markers for longevity.
Not gone into this in detail but it seems readily available...
"The Android build is routinely tested on recent versions of Ubuntu (6.06 and later),"
"Andy Burnham".......defended the scheme"
Oh good grief ! - in a deep hole and still digging !
"When we can get a solar panel that can literally power an entire car"
I think peak sunlight is only ~1kW/m^2. So I don't think we will ever see that except for exotic, lightweight cars running in a very sunny climate.
Probably just pass straight through relatively thin skinned ships. Might be nasty but not terminal.
"how to get Skype to work with webcam on my Linux box"
Funny it works on all 7 of mine ! - and they are all different hardware
"6-8 hours on the command line it takes"
Well I support 7 Linux systems and whilst I agree that they are stable, reliable and require little attention I can't agree with the difficulty of configuration. Using SUSE 11.2 I NEVER use the command line to install/configure and the last machine took 20 mins from start to finish (+ updates )
"the pentane was driven off by heating to be replaced by air diffusing in"
Pentane should diffuse out readily even in closed cell foam
- Facebook offshores HUGE WAD OF CASH to Caymans - via Ireland
- Microsoft teams up with Feds, Europol in ZeroAccess botnet zombie hunt
- Justin Bieber BEGGED for a $200k RIM JOB – and got REJECTED
- Review Bigger on the inside: WD’s Tardis-like Black² Dual Drive laptop disk
- Inside Steve Ballmer’s fondleslab rear-guard action