Another actualised metaphor
Dec. 4th, 2007 09:36 pmUnder appropriate circumstances, it is possible to feel stress in your shoulders.
I am wondering at what point it makes sense to curse very loudly, purchase a generic Windows-running PC from WoC, and send this perfectly respectable computer, with six years of service behind it, to Cambridge Computer Recycling where it will be examined, declared too weird for resale (it has Rambus memory and a 478-pin-to-423-pin adaptor hosting a 2.3GHz Pentium 4 - you may not remember that they made 2.3GHz Pentium 4s; AGP graphics, PATA hard discs, and a floppy drive with a label 'tested OK 23/9/1997' on it), and thrown away as good for nothing.
You would naively suppose that installing Windows XP onto a computer which has in the past run Windows XP, and which until you started the installation was happily running SuSE 10.1, would not be a hard job. I've spent six hours at it so far, I've removed, twiddled, checked jumpers and reinserted all the hardware on the system, but whatever I do, and whichever of the hard discs I have around I use, the best case is that Windows Setup spends half an hour formatting the disc before declaring that the disc cannot be formatted and stopping. The normal case is that it fails to recognise the existence of either CD-ROM drive. No smoke has come out, yet, which is better than the computer I bought at the start of this year.
I suspect it's something to do with masters and slaves on IDE channels. Or, I suppose, it's conceivable that both hard discs are broken. I sit. I sip cocoa, I plan an early night. Unfortunately, my current reading is the Chronicles of Thomas Covenant, Unbeliever, which is not as purely calming as something with more cuddly pandas and fewer self-destructive depressed lepers would be.
Update: As always, I spoke too soon; having run out of things to try, the final thing I tried actually worked. The machine runs Windows XP, connects to the wireless network (note: ensure you have typed in MAC addresses correctly when adding to the allow-from-only-these list), plays DVDs (thanks to VLC), and is in fact a reasonable form of the birthday present that I'd tried to give to my youngest brother back in July. My shoulders feel less spiky already, and it's only, umm, four hours since I started this time, and I only wasted a couple of hours back in August.
Downloading security update KB873339 (1 of 86) - and it was a WinXP SP2 install disc!
I am wondering at what point it makes sense to curse very loudly, purchase a generic Windows-running PC from WoC, and send this perfectly respectable computer, with six years of service behind it, to Cambridge Computer Recycling where it will be examined, declared too weird for resale (it has Rambus memory and a 478-pin-to-423-pin adaptor hosting a 2.3GHz Pentium 4 - you may not remember that they made 2.3GHz Pentium 4s; AGP graphics, PATA hard discs, and a floppy drive with a label 'tested OK 23/9/1997' on it), and thrown away as good for nothing.
You would naively suppose that installing Windows XP onto a computer which has in the past run Windows XP, and which until you started the installation was happily running SuSE 10.1, would not be a hard job. I've spent six hours at it so far, I've removed, twiddled, checked jumpers and reinserted all the hardware on the system, but whatever I do, and whichever of the hard discs I have around I use, the best case is that Windows Setup spends half an hour formatting the disc before declaring that the disc cannot be formatted and stopping. The normal case is that it fails to recognise the existence of either CD-ROM drive. No smoke has come out, yet, which is better than the computer I bought at the start of this year.
I suspect it's something to do with masters and slaves on IDE channels. Or, I suppose, it's conceivable that both hard discs are broken. I sit. I sip cocoa, I plan an early night. Unfortunately, my current reading is the Chronicles of Thomas Covenant, Unbeliever, which is not as purely calming as something with more cuddly pandas and fewer self-destructive depressed lepers would be.
Update: As always, I spoke too soon; having run out of things to try, the final thing I tried actually worked. The machine runs Windows XP, connects to the wireless network (note: ensure you have typed in MAC addresses correctly when adding to the allow-from-only-these list), plays DVDs (thanks to VLC), and is in fact a reasonable form of the birthday present that I'd tried to give to my youngest brother back in July. My shoulders feel less spiky already, and it's only, umm, four hours since I started this time, and I only wasted a couple of hours back in August.
Downloading security update KB873339 (1 of 86) - and it was a WinXP SP2 install disc!
The United Russia party apparently secured a 99% majority in Chechnya, on a 99% turnout.
The Putinjugend are holding a victory rally in Moscow as I type.
It appears that the secrecy of the ballot was not universally respected; for example 'those voting for United Russia were entered into a prize lottery in the city of St Petersburg'. One wonders how they could tell.
It's always instructive to compare Russian and Chinese propaganda. At the moment, Chinese propaganda is filled with apologetic remarks about monetary policy and the need for action on climate change, and the occasional panda. The Russians seem not to bother with propaganda, the state of affairs is presented unapologetically by former KGBniks, with a very strong 'what are you going to do about it?' tone.
Modest-proposal mode: lift immigration restrictions against Russians, so at least they can get out. Get Ukraine into the EU as soon as can be arranged. Build nuclear power plants, fund ITER, insulate, conserve; and long for the day that we can tell the Russian government, as the Saudi despots, that they are welcome to drink their oil and breathe their natural gas, for we their former addicts have no need for it. In what-if mode, wish that Yeltsin had blasted the KGB to ash as thoroughly as the Stasi and Czech StB were dismantled.
In other news, Livejournal has been bought by СУП, 'an international online media company with established partnerships with businesses across the globe. It was founded in the summer of 2006 by an international management team with Russian seed capital'.
The Putinjugend are holding a victory rally in Moscow as I type.
It appears that the secrecy of the ballot was not universally respected; for example 'those voting for United Russia were entered into a prize lottery in the city of St Petersburg'. One wonders how they could tell.
It's always instructive to compare Russian and Chinese propaganda. At the moment, Chinese propaganda is filled with apologetic remarks about monetary policy and the need for action on climate change, and the occasional panda. The Russians seem not to bother with propaganda, the state of affairs is presented unapologetically by former KGBniks, with a very strong 'what are you going to do about it?' tone.
Modest-proposal mode: lift immigration restrictions against Russians, so at least they can get out. Get Ukraine into the EU as soon as can be arranged. Build nuclear power plants, fund ITER, insulate, conserve; and long for the day that we can tell the Russian government, as the Saudi despots, that they are welcome to drink their oil and breathe their natural gas, for we their former addicts have no need for it. In what-if mode, wish that Yeltsin had blasted the KGB to ash as thoroughly as the Stasi and Czech StB were dismantled.
In other news, Livejournal has been bought by СУП, 'an international online media company with established partnerships with businesses across the globe. It was founded in the summer of 2006 by an international management team with Russian seed capital'.
My favourite poem
Nov. 24th, 2007 12:36 amG K Chesterton, of course:
For Four Guilds
( Eighteen rather long stanzas )
I know not where to find today sentences so honed and stresses so artfully wrought. It may be that this is a niche that is filled; that anyone with the skill and the desire to write in that mode has the wit to look on Chesterton and on Kipling and see that they are outmatched.
For Four Guilds
( Eighteen rather long stanzas )
I know not where to find today sentences so honed and stresses so artfully wrought. It may be that this is a niche that is filled; that anyone with the skill and the desire to write in that mode has the wit to look on Chesterton and on Kipling and see that they are outmatched.
That massive HMRC leak of data
Nov. 21st, 2007 11:52 amThis is a classic example of a story the reporting of which is itself the problem. The data has been lost; with reasonably high probability it's been lost to people unable to do anything with it, in which case nothing has actually happened. If it is lost to people able to do things with it, it increases the background risk of identity theft, but there is nothing whatsoever that any given individual can do given this information - it's even less useful than the 'avian flu exists; refrain from handling dead wild birds if at all possible' news items of the start of the year. The useful mitigation has to be done at the level of large-scale identity users, essentially the banks.
But the information has been presented in a way that clearly has worried people; and to worry twenty-five million people about something which ought to be giving sleepless nights to two dozen teams in the back offices of major banks doesn't seem a publicly valuable act ... raising blood-pressures by on average one quarter-micron of mercury will statistically cause some number of heart attacks, which will statistically cause some number of deaths that would be considered front-page, questions-in-the-House bad news if caused by men with knives.
I'm not sure this particular large data-leak can't be spun as a strong argument for ID cards. It means that it can be argued that bad-guys-unspecified have the NI numbers, dates of birth and bank information for near enough everybody, at which point any organisation prepared to let somebody do something to my detriment given only my NI number, date of birth and bank information is presumptively negligent.
I don't think this troubles me too much - I am fairly happy to open bank accounts by appearing in person with a cheque, a passport and a gas bill - but it's clearly troublesome for people for whom getting to the bank is hard, or for whom the cost of getting a passport is significant.
There's certainly an argument that I can imagine being made, of the shape 'previous proof-of-identity systems which we believed adequate are compromised; requiring time-consuming authentication processes from everybody is expensive; what we need to do is to move to some other method of authentication, for example these beautiful high-tech public-key-authentication-on-secure-processor ID-cards what the selfless people at EDS have prepared for us'.
But the information has been presented in a way that clearly has worried people; and to worry twenty-five million people about something which ought to be giving sleepless nights to two dozen teams in the back offices of major banks doesn't seem a publicly valuable act ... raising blood-pressures by on average one quarter-micron of mercury will statistically cause some number of heart attacks, which will statistically cause some number of deaths that would be considered front-page, questions-in-the-House bad news if caused by men with knives.
I'm not sure this particular large data-leak can't be spun as a strong argument for ID cards. It means that it can be argued that bad-guys-unspecified have the NI numbers, dates of birth and bank information for near enough everybody, at which point any organisation prepared to let somebody do something to my detriment given only my NI number, date of birth and bank information is presumptively negligent.
I don't think this troubles me too much - I am fairly happy to open bank accounts by appearing in person with a cheque, a passport and a gas bill - but it's clearly troublesome for people for whom getting to the bank is hard, or for whom the cost of getting a passport is significant.
There's certainly an argument that I can imagine being made, of the shape 'previous proof-of-identity systems which we believed adequate are compromised; requiring time-consuming authentication processes from everybody is expensive; what we need to do is to move to some other method of authentication, for example these beautiful high-tech public-key-authentication-on-secure-processor ID-cards what the selfless people at EDS have prepared for us'.
Issue: What do I need to do to get a tape autoloader to work on an RHEL 3 machine
Answer: You need to install 'mtx' and 'sg3_utils' by doing 'up2date mtx; up2date sg3_utils', then reboot.
Issue: My computer running RHEL 3 (Red Hat Enterprise Linux 3) does not detect the media changer on my Quantum Superloader 3 tape library. Or it does not detect a WD MyBook USB hard drive, with /proc/scsi/scsi listing only the 'Enclosure' part.
Answer: http://spiralbound.net/2006/10/16/making-rhel-3-see-multiple-luns - you need to add a line to /etc/modules and rebuild your initrd to tell the kernel to look for multiple SCSI devices exposed by a single physical machine. Since USB, for added irritation, is part of the SCSI subsystem, this is also needed for USB peripherals that expose several USB devices.
By the way, the 'Enclosure' for a WD MyBook USB hard drive is the glowing blue button on the front.
Issue: Having done this, I get 'input/output error' messages from Amanda and 'st0: incorrect block size' messages appear in dmesg
Answer: You need to issue a 'mt -f /dev/nst0 setblk 0' command, possibly every time that you load a tape
Issue: mtx doesn't detect the mail-slot on my Quantum Superloader 3 tape library
Answer: No. It doesn't. Use the controls on the front to load and eject tapes from the library. Sorry.
It has taken two of us most of the day so far to answer these questions; Google gets inordinate numbers of references to the questions and very few to the answers. I *hope* that Google will now index this page and my successors will be able to get all of this at once.
BTW, do not mail john@globalphasing.net because we are using it as a spamtrap
Answer: You need to install 'mtx' and 'sg3_utils' by doing 'up2date mtx; up2date sg3_utils', then reboot.
Issue: My computer running RHEL 3 (Red Hat Enterprise Linux 3) does not detect the media changer on my Quantum Superloader 3 tape library. Or it does not detect a WD MyBook USB hard drive, with /proc/scsi/scsi listing only the 'Enclosure' part.
Answer: http://spiralbound.net/2006/10/16/making-rhel-3-see-multiple-luns - you need to add a line to /etc/modules and rebuild your initrd to tell the kernel to look for multiple SCSI devices exposed by a single physical machine. Since USB, for added irritation, is part of the SCSI subsystem, this is also needed for USB peripherals that expose several USB devices.
By the way, the 'Enclosure' for a WD MyBook USB hard drive is the glowing blue button on the front.
Issue: Having done this, I get 'input/output error' messages from Amanda and 'st0: incorrect block size' messages appear in dmesg
Answer: You need to issue a 'mt -f /dev/nst0 setblk 0' command, possibly every time that you load a tape
Issue: mtx doesn't detect the mail-slot on my Quantum Superloader 3 tape library
Answer: No. It doesn't. Use the controls on the front to load and eject tapes from the library. Sorry.
It has taken two of us most of the day so far to answer these questions; Google gets inordinate numbers of references to the questions and very few to the answers. I *hope* that Google will now index this page and my successors will be able to get all of this at once.
BTW, do not mail john@globalphasing.net because we are using it as a spamtrap
Technology eulogies
Nov. 11th, 2007 05:22 pmI've just listened to Woody Guthrie's Grand Coulee Dam three times, because there's nothing in my collection quite like it.
Among my readers are some vastly better-listened than I. Can you suggest similar eulogies to reinforced concrete and thirty-foot turbines? I suppose Leslie Fish's Hope Eyrie is something of the same kind of thing.
Among my readers are some vastly better-listened than I. Can you suggest similar eulogies to reinforced concrete and thirty-foot turbines? I suppose Leslie Fish's Hope Eyrie is something of the same kind of thing.
A squall-line came over this afternoon, down from the Orkneys on the wings of a tree-felling and ship-sinking wind, bringing behind it beautifully clear sky; Ed had said that he'd tried and failed to photograph the comet, so I wondered if it had faded substantially, and went out with a range of cameras.
With my little camera (Canon Powershot A510; 15s f/5.5, 140mm-equivalent, ISO 400) I get the left-hand picture. It's not a good picture - the lens is flaring badly around the brighter stars, and the colours are much too blue, with alpha Persei looking the actinic-blue of an O-type star when its spectral type is a more prosaic F5 - but it's a 200-gram pocket camera not intended for astronomy; the right-hand picture is with totally different kit but at about the same scale, taken by me on Saturday, to show that the comet is moving.

With a camera of inconvenient size (Nikon D100; 200mm, f/2.8, the camera and lens weighing in at 2.3kg, 4-second exposure at ISO 1000, push ISO up a couple of stops in gimp cursing at the lack of 16-bit-per-channel support) I get

So it's still pretty visible to me; I'm surprised that Ed couldn't get a picture of it without sky-fog issues (in that it's a lot brighter than sky-fog to me, and would be visible through it unless the exposure was so long that the sky-fog saturated), unless where he lives is a lot more floodlit than a central-Cambridge back garden.
With my little camera (Canon Powershot A510; 15s f/5.5, 140mm-equivalent, ISO 400) I get the left-hand picture. It's not a good picture - the lens is flaring badly around the brighter stars, and the colours are much too blue, with alpha Persei looking the actinic-blue of an O-type star when its spectral type is a more prosaic F5 - but it's a 200-gram pocket camera not intended for astronomy; the right-hand picture is with totally different kit but at about the same scale, taken by me on Saturday, to show that the comet is moving.
With a camera of inconvenient size (Nikon D100; 200mm, f/2.8, the camera and lens weighing in at 2.3kg, 4-second exposure at ISO 1000, push ISO up a couple of stops in gimp cursing at the lack of 16-bit-per-channel support) I get
So it's still pretty visible to me; I'm surprised that Ed couldn't get a picture of it without sky-fog issues (in that it's a lot brighter than sky-fog to me, and would be visible through it unless the exposure was so long that the sky-fog saturated), unless where he lives is a lot more floodlit than a central-Cambridge back garden.
[screen-capped rather than linked]
news.bbc

finance.yahoo.com

I don't think wide stock-market indices are supposed to wiggle with that sort of frequency; I assume it's a Bug at FTSE, since the charts from the BBC and Yahoo are essentially identical, but someone in London must be running around like a headless chicken trying to sort this out.
news.bbc
finance.yahoo.com
I don't think wide stock-market indices are supposed to wiggle with that sort of frequency; I assume it's a Bug at FTSE, since the charts from the BBC and Yahoo are essentially identical, but someone in London must be running around like a headless chicken trying to sort this out.
Books read in October
Nov. 7th, 2007 12:54 amWilliam Gibson, Spook Country. Beautifully styled novel with a half-nostalgic, half-McGuffin feel to it; the characters are all doing things towards goals they don't know without knowledge of one another, and it all proceeds to a calm lack-of-conclusion. Lots of style, lots of carefully-described luxury, and a magnetically-levitated bed.
Thomas Pynchon, Mason & Dixon. This is clearly the most renowned of the class of whimsical novels substantially set in colonial America, like James Morrow's The Last Witchfinder and Stephenson's Baroque trilogy, but I found it enormous effort to read, and not repaying the effort at all; the whimsy doesn't have the focus of Stephenson or the brisk amusement of Morrow, things like the Duck struck me as incongruous and silly rather than funny.
Joe Abercrombie, The Blade Itself. This is a quick and easy read, the multiple narrators all have heads that it's interesting to be in, the environment is Locke Lamora a couple of hundred years earlier, and there's a wizard of phenomenal power and calm demeanor. First of a trilogy, I'll pick up the sequel in paperback.
David Durham, Acacia. First big book in a promised trilogy, this has a lot of the extruded-fantasy flaws - there is a map, and everywhere on the map is visited. It has scale and scope, mighty battles, giant pig-monsters, ancient sorcerors, treachery, a daring terrorist attack by the protagonists, the death of an empire sustained by an evil secret, four children scattered to the corners of the world, a goddess in the form of a sea-eagle, more treachery, assassination, and in general a hefty spoonful from each spice-bottle on the fantasy writer's shelf mixed together into cough-inducing chaos. I don't think I'll be getting the sequel.
Carl Hiaasen, Nature Girl. This one's dreadful; Hiaasen seems to have reached the stage of writing the same book again and again, the villainy is all too petty and the characters all too plastic, and to write at novel length that the Everglades are over-exploited by tourists and telemarketers prone to be irritating is something of a waste of trees. A pity; I very much liked his early, good stuff.
Sergei Lukyanenko, Night Watch, borrowed from
despotliz. This one's fantastic. You'll probably have seen the film; this is better than the film, because the writing's drier and the characters and the environment come across more - it's Moscow from the point of view of someone to whom Moscow is just the place they happen to live. Three interlinked novellas, some of the same shape of bureaucracy as Stross's Laundry novels but with the zaniness turned down to a much more bearable level. I am prepared to give moderately solemn vows and undergo indignities of the fifth or sixth level to read the sequels.
Thomas Pynchon, Mason & Dixon. This is clearly the most renowned of the class of whimsical novels substantially set in colonial America, like James Morrow's The Last Witchfinder and Stephenson's Baroque trilogy, but I found it enormous effort to read, and not repaying the effort at all; the whimsy doesn't have the focus of Stephenson or the brisk amusement of Morrow, things like the Duck struck me as incongruous and silly rather than funny.
Joe Abercrombie, The Blade Itself. This is a quick and easy read, the multiple narrators all have heads that it's interesting to be in, the environment is Locke Lamora a couple of hundred years earlier, and there's a wizard of phenomenal power and calm demeanor. First of a trilogy, I'll pick up the sequel in paperback.
David Durham, Acacia. First big book in a promised trilogy, this has a lot of the extruded-fantasy flaws - there is a map, and everywhere on the map is visited. It has scale and scope, mighty battles, giant pig-monsters, ancient sorcerors, treachery, a daring terrorist attack by the protagonists, the death of an empire sustained by an evil secret, four children scattered to the corners of the world, a goddess in the form of a sea-eagle, more treachery, assassination, and in general a hefty spoonful from each spice-bottle on the fantasy writer's shelf mixed together into cough-inducing chaos. I don't think I'll be getting the sequel.
Carl Hiaasen, Nature Girl. This one's dreadful; Hiaasen seems to have reached the stage of writing the same book again and again, the villainy is all too petty and the characters all too plastic, and to write at novel length that the Everglades are over-exploited by tourists and telemarketers prone to be irritating is something of a waste of trees. A pity; I very much liked his early, good stuff.
Sergei Lukyanenko, Night Watch, borrowed from
Conference
Nov. 4th, 2007 02:51 pmLast week, I was at the PSDI conference in Autrans, a small farming town in the mountains near (ten kilometres as the crow flies, forty-five minutes and €80 as the road winds and the taxi drives) Grenoble.

It was French, so the food was copious - hot chocolate and croissants for breakfast, four-course lunches to go with the four-course dinners, and no table at any stage without its bottle of wine of each colour. Cuisse de oie as the main course for lunch one day, terrine de foie gras served with a glass of Sauternes as the starter for dinner the next, and plenty of time to enjoy the selection of local cheeses before dessert turns up.
The normal conference attractions: insanely complicated slides (this one coming from a talk in which a large and serious team at Novartis discovered that three techniques for telling whether your drug-like molecule has linked to your protein gave completely different results)

a cultural visit (the expressions on the faces of a large number of microbiologists as they watch a team of assistant cheese-makers without gloves carefully rubbing mould fibres off a huge pile of cheeses are well worth the imagining)

and a site visit to the European Synchrotron Radiation Facility, with trips down to see the marvellous contraptions which are beam-lines

On the left is a device for spectroscopy on mounted crystals; the hedgehog of beam-launching telescopes is fed by optic fibres from a collection of large lasers mounted on the next bench, the microscope at the top is attached to a box full of diffraction gratings to analyse the light that comes out, and the thin metal tube on the right blows liquid nitrogen at the whole thing to keep it cold.
On the right is a 'mini-kappa', a device for twiddling crystals so that they are lined up in a desirable way, so that you can observe things the small differences between which are critically important to phasing the data at the same time, rather than one at the start of the experiment and one after the crystal has been blasted with X-rays for half an hour. After half an hour of X-ray exposure the crystal will usually explode as it warms up - the X-rays make carboxylic acid groups fall off and turn into high-pressure carbon dioxide inside the crystal.
I got a couple of hours in Grenoble proper, on a rather grey day. The city spreads out over a flat bit at the intersection of two rivers, with a comprehensively fortified mountain starting on the right bank of the Isère. I took the cable-car up to the fortress and walked down, with excellent panoramic views of Grenoble laid out below me, starting just as my camera broke down.
Next year's will be in England; hosted by Glaxo, and probably in the neighbourhood of Stevenage. I'm not sure how the cultural visit, or indeed the food, will compare.
It was French, so the food was copious - hot chocolate and croissants for breakfast, four-course lunches to go with the four-course dinners, and no table at any stage without its bottle of wine of each colour. Cuisse de oie as the main course for lunch one day, terrine de foie gras served with a glass of Sauternes as the starter for dinner the next, and plenty of time to enjoy the selection of local cheeses before dessert turns up.
The normal conference attractions: insanely complicated slides (this one coming from a talk in which a large and serious team at Novartis discovered that three techniques for telling whether your drug-like molecule has linked to your protein gave completely different results)
a cultural visit (the expressions on the faces of a large number of microbiologists as they watch a team of assistant cheese-makers without gloves carefully rubbing mould fibres off a huge pile of cheeses are well worth the imagining)
and a site visit to the European Synchrotron Radiation Facility, with trips down to see the marvellous contraptions which are beam-lines
On the left is a device for spectroscopy on mounted crystals; the hedgehog of beam-launching telescopes is fed by optic fibres from a collection of large lasers mounted on the next bench, the microscope at the top is attached to a box full of diffraction gratings to analyse the light that comes out, and the thin metal tube on the right blows liquid nitrogen at the whole thing to keep it cold.
On the right is a 'mini-kappa', a device for twiddling crystals so that they are lined up in a desirable way, so that you can observe things the small differences between which are critically important to phasing the data at the same time, rather than one at the start of the experiment and one after the crystal has been blasted with X-rays for half an hour. After half an hour of X-ray exposure the crystal will usually explode as it warms up - the X-rays make carboxylic acid groups fall off and turn into high-pressure carbon dioxide inside the crystal.
I got a couple of hours in Grenoble proper, on a rather grey day. The city spreads out over a flat bit at the intersection of two rivers, with a comprehensively fortified mountain starting on the right bank of the Isère. I took the cable-car up to the fortress and walked down, with excellent panoramic views of Grenoble laid out below me, starting just as my camera broke down.
Next year's will be in England; hosted by Glaxo, and probably in the neighbourhood of Stevenage. I'm not sure how the cultural visit, or indeed the food, will compare.
As I came back from the Parkside ceilidh this evening, I noticed that the sky was clear, Comet Holmes visible to the naked eye as the corner of a triangle in Perseus which I knew wasn't there the last time I admired Perseus (the comet grew brighter by a factor 30,000 about ten days ago), and my brain not entirely befuddled. So I set up the most elaborate camera gear I had access to on a tripod in the garden, and got this:

I'm sure I can do better - I didn't set up the impressive telescope that
major_clanger lent me, because there was only one of me and it was midnight, and I've really done very little processing on the raw camera output. In particular, there are bright green stars in the photo above, and those don't exist. That picture is a few-second exposure at 80mm f/2.8 ISO1000 with my Absurd Photojournalist Lens; exposures at 200mm f/2.8 make it look bigger but not obviously better:

The geometry of this comet is a bit odd - basically we're between it and the Sun, so the tail is pointing directly away from us and visible only as the elongation of the coma.
I'm sure I can do better - I didn't set up the impressive telescope that
The geometry of this comet is a bit odd - basically we're between it and the Sun, so the tail is pointing directly away from us and visible only as the elongation of the coma.
The blue fury of the Metropolitan police
Oct. 24th, 2007 10:22 pmI've started watching more DVDs, thanks to Blockbuster and to having Ben in the house of evenings; mostly things that I remember being vaguely entertaining as cinema trailers but never got round to seeing on the big screen.
Are there any films that end with the massive intervention of legitimate authority? After Hot Fuzz and Mr and Mrs Smith, I would be very refreshed to see something where the police exist, are summoned to scenes of inordinate mayhem, and don't give up until the perpetrator is caught; where Secret Society A and Secret Society B clash in Los Angeles and both end up trapped in road-blocked streets and detained by the LAPD; or where the characters engaged in diabolism end up encountering the wrath of God and transformed to pillars of salt.
I suppose Good Omens comes close to the last.
This may be like my main complaint with Grand Theft Auto, which is that the police give up too readily; repeatedly shooting policemen gets you the attention of the army, but this is an opportunity to rampage in a stolen tank rather than the certainty of long-range-rifle-borne instantaneous death.
It's probably difficult to write an engaging script which features the arrest, trial and detention of the hero, and 'shot by the SWAT team' is a somewhat sudden conclusion. But I'd just for once like to see something where the firing of a single shot is a major life-changing event.
Are there any films that end with the massive intervention of legitimate authority? After Hot Fuzz and Mr and Mrs Smith, I would be very refreshed to see something where the police exist, are summoned to scenes of inordinate mayhem, and don't give up until the perpetrator is caught; where Secret Society A and Secret Society B clash in Los Angeles and both end up trapped in road-blocked streets and detained by the LAPD; or where the characters engaged in diabolism end up encountering the wrath of God and transformed to pillars of salt.
I suppose Good Omens comes close to the last.
This may be like my main complaint with Grand Theft Auto, which is that the police give up too readily; repeatedly shooting policemen gets you the attention of the army, but this is an opportunity to rampage in a stolen tank rather than the certainty of long-range-rifle-borne instantaneous death.
It's probably difficult to write an engaging script which features the arrest, trial and detention of the hero, and 'shot by the SWAT team' is a somewhat sudden conclusion. But I'd just for once like to see something where the firing of a single shot is a major life-changing event.
Une système de transport integrée
Oct. 10th, 2007 03:32 pmI discovered today that I need to represent the company I work for at a conference in Grenoble in two week's time.
Writing a half-hour presentation about fitting molecular models into X-ray-derived difference density will be a bit of work, but at least getting to Grenoble ought not to be a problem; it's famously a TGV destination, I have all of Sunday to get there (conference starts at 8pm Sunday; this being France it starts with an enormous buffet meal), and all of Wednesday afternoon to get back (conference ends noon Wednesday).
The latest Paris-London Eurostar with seats leaves before the latest Grenoble-Paris train with seats gets to Paris. Easyjet in theory flies to Grenoble, but all its flights are sold out. Easyjet's one daily flight from Lyon leaves too early. BA has (expensive) flights at good times, but there's no train from Grenoble on the Wednesday afternoon to get to Lyon in time to catch the BA flight, even though the Lyon TGV station and airport are conveniently colocated.
I have ended up by throwing up my hands and asking the travel-agent who sorted out my trip to Turkey what she can do.
PS: Miraculous and entirely unexpected resolution by
vicarage
Writing a half-hour presentation about fitting molecular models into X-ray-derived difference density will be a bit of work, but at least getting to Grenoble ought not to be a problem; it's famously a TGV destination, I have all of Sunday to get there (conference starts at 8pm Sunday; this being France it starts with an enormous buffet meal), and all of Wednesday afternoon to get back (conference ends noon Wednesday).
The latest Paris-London Eurostar with seats leaves before the latest Grenoble-Paris train with seats gets to Paris. Easyjet in theory flies to Grenoble, but all its flights are sold out. Easyjet's one daily flight from Lyon leaves too early. BA has (expensive) flights at good times, but there's no train from Grenoble on the Wednesday afternoon to get to Lyon in time to catch the BA flight, even though the Lyon TGV station and airport are conveniently colocated.
I have ended up by throwing up my hands and asking the travel-agent who sorted out my trip to Turkey what she can do.
PS: Miraculous and entirely unexpected resolution by
The Polynomial from Beyond Space
Oct. 9th, 2007 02:27 pmAs far as I've bothered to run the exhaustive search, the number of ways of making a tetrahedron out of N colours of perspex rods such that you never have two rods of the same colour coming out of a single vertex, but not requiring you to use all N colours, is N (N-1) (N-2) (N^3-9N^2+29N-32).
This doesn't seem a very natural polynomial to me.
There seems to be a unique-up-to-A5 three-colouring of the edges of a dodecahedron and a unique-up-to-S4 three-colouring of the edges of a cube; there's an obvious unique-up-to-S3 three-colouring of the edges of a tetrahedron. Obviously you can't three-colour the edges of an octahedron or an icosahedron, since four or five edges meet at a vertex; it looks as if there are maybe two group-theoretically-distinct four-colourings of the octahedron, and roughly 1560 five-colourings of the icosahedron.
As an obviously related question, where can I get some (fifty would be a good number) two-inch solid black rubber balls? I have already found a supplier of six-foot lengths of half-inch perspex rod in three distinct fluorescent colours ...
What's a material that can both be cast and machined? To get the holes in the balls in the right places I'd need the use of a drill-press and a couple of oddly-shaped jigs, and the easy way to make the jigs seems to be to use a ball as a mould to cast a hemispherical hole in something castable, then orient the casting properly (this is the tough part, I don't know what the name for the kind of contraption of adjustable vices I'm thinking of would be), drill a hole in the correct place with the drill-press, and insert a spare bit of half-inch dowelling to fit into the first hole drilled so that the second and third (and fourth and fifth for the icosahedron) end up in the right places. Or is drilling holes in rubber balls likely to be a source of frustration, horrible stench, and an unreasonable amount of time spent cleaning melted rubber off drill-bits?
This doesn't seem a very natural polynomial to me.
There seems to be a unique-up-to-A5 three-colouring of the edges of a dodecahedron and a unique-up-to-S4 three-colouring of the edges of a cube; there's an obvious unique-up-to-S3 three-colouring of the edges of a tetrahedron. Obviously you can't three-colour the edges of an octahedron or an icosahedron, since four or five edges meet at a vertex; it looks as if there are maybe two group-theoretically-distinct four-colourings of the octahedron, and roughly 1560 five-colourings of the icosahedron.
As an obviously related question, where can I get some (fifty would be a good number) two-inch solid black rubber balls? I have already found a supplier of six-foot lengths of half-inch perspex rod in three distinct fluorescent colours ...
What's a material that can both be cast and machined? To get the holes in the balls in the right places I'd need the use of a drill-press and a couple of oddly-shaped jigs, and the easy way to make the jigs seems to be to use a ball as a mould to cast a hemispherical hole in something castable, then orient the casting properly (this is the tough part, I don't know what the name for the kind of contraption of adjustable vices I'm thinking of would be), drill a hole in the correct place with the drill-press, and insert a spare bit of half-inch dowelling to fit into the first hole drilled so that the second and third (and fourth and fifth for the icosahedron) end up in the right places. Or is drilling holes in rubber balls likely to be a source of frustration, horrible stench, and an unreasonable amount of time spent cleaning melted rubber off drill-bits?
(no subject)
Oct. 8th, 2007 10:25 amA Greenpeace article
http://www.greenpeace.org.uk/blog/climate/greenpeace-shuts-down-coal-fired-power-station-20071008
includes the line 'And it will only be 45 per cent efficient, in an age when power stations can reach 95 per cent efficiency'.
This is a coal-fired power station, so 45% efficiency in converting thermal to electrical energy is I think extremely good.
95% thermal efficiency implies, by the Carnot equation, that the heater is twenty times hotter in Kelvin than the heatsink and that there are no other thermal losses in the system. With a heatsink laid on an infinite icefield at zero centigrade, the heater has only to be hot enough to boil tungsten. I was unaware that gas-cored fission reactors were either in production, or this enthusiastically endorsed by Greenpeace.
http://www.greenpeace.org.uk/blog/climate/greenpeace-shuts-down-coal-fired-power-station-20071008
includes the line 'And it will only be 45 per cent efficient, in an age when power stations can reach 95 per cent efficiency'.
This is a coal-fired power station, so 45% efficiency in converting thermal to electrical energy is I think extremely good.
95% thermal efficiency implies, by the Carnot equation, that the heater is twenty times hotter in Kelvin than the heatsink and that there are no other thermal losses in the system. With a heatsink laid on an infinite icefield at zero centigrade, the heater has only to be hot enough to boil tungsten. I was unaware that gas-cored fission reactors were either in production, or this enthusiastically endorsed by Greenpeace.
At last, Doc Smith superalloys!
Sep. 30th, 2007 01:37 pmWhile idly looking for information about NASA's new class of nuclear power source for space missions, I came across something I've been looking for for ages: studies of the analogues of high-strength steels made using elements further down the periodic table. Whilst rhenium is readily purchased on ebay, the furnace requirements are unfortunately rather exacting for doing this work in one's back garden.
http://sakimori.nims.go.jp/documents/990225b.html was the first one; the interesting bit of data is figure 1. MarM247, sitting there quite a long way under the red iridium-based lines, is a current best-available turbine-blade alloy.
http://sakimori.nims.go.jp/documents/001113a.html investigates four-element alloys, though the character-set information has been slightly mangled; http://nippon.zaidan.info/seikabutsu/2003/00916/pdf/igtc2003tokyo_ks2.pdf is a large but interesting overview article.
OK, there are some small pricing issues associated with making the blades for jet engine or power station turbines out of materials slightly more costly than platinum, but the design and machining costs are themselves large enough that even that class of material cost is not insuperable, particularly since a 500MW turbine produces electricity with a retail value of about a hundred thousand pounds per hour of operation and consumes, at the 33% thermal efficiency of Drax, 1200 tonsworth of CO2-emission permits which at one point cost 30 euros the tonsworth: that iridium is twice as dense as lead does make things a bit awkward, but increasing thermal efficiency significantly, so substantially reducing the weight of CO2-emission permits that you are burning an hour, might well be enough to break even.
What surprises me slightly is that all this research is in Japan, whilst if asked to name four jet engine manufacturers I'd list Rolls-Royce, General Electric, Pratt and Whitney, and then confess myself lost and try to Google up who Sukhoi and MIG's suppliers are. I suppose there are quite a lot of power stations in Japan, mostly built by Japanese companies, and that this has built up expertise such that the turbines in power stations worldwide may well be bought from Hitachi.
http://sakimori.nims.go.jp/documents/990225b.html was the first one; the interesting bit of data is figure 1. MarM247, sitting there quite a long way under the red iridium-based lines, is a current best-available turbine-blade alloy.
http://sakimori.nims.go.jp/documents/001113a.html investigates four-element alloys, though the character-set information has been slightly mangled; http://nippon.zaidan.info/seikabutsu/2003/00916/pdf/igtc2003tokyo_ks2.pdf is a large but interesting overview article.
OK, there are some small pricing issues associated with making the blades for jet engine or power station turbines out of materials slightly more costly than platinum, but the design and machining costs are themselves large enough that even that class of material cost is not insuperable, particularly since a 500MW turbine produces electricity with a retail value of about a hundred thousand pounds per hour of operation and consumes, at the 33% thermal efficiency of Drax, 1200 tonsworth of CO2-emission permits which at one point cost 30 euros the tonsworth: that iridium is twice as dense as lead does make things a bit awkward, but increasing thermal efficiency significantly, so substantially reducing the weight of CO2-emission permits that you are burning an hour, might well be enough to break even.
What surprises me slightly is that all this research is in Japan, whilst if asked to name four jet engine manufacturers I'd list Rolls-Royce, General Electric, Pratt and Whitney, and then confess myself lost and try to Google up who Sukhoi and MIG's suppliers are. I suppose there are quite a lot of power stations in Japan, mostly built by Japanese companies, and that this has built up expertise such that the turbines in power stations worldwide may well be bought from Hitachi.
Istanbul 3
Sep. 27th, 2007 08:49 pmI'd left the classic attractions of Istanbul to last; Hagia Sophia and the Topkapi palace.
When fifteen hundred years old I am, look so good I will not, but Hagia Sophia is feeling its age; there are about four gold-tiled mosaics left, which give no more than a hint of what it looked like when the five domes were covered with them. Also there was a huge arrangement of scaffolding holding up one quadrant of the dome, and the outside is propped up with many very large and solid buttresses, though a lot of those are the work of Architect Sinan in the sixteenth century.
When fifteen hundred years old I am, look so good I will not, but Hagia Sophia is feeling its age; there are about four gold-tiled mosaics left, which give no more than a hint of what it looked like when the five domes were covered with them. Also there was a huge arrangement of scaffolding holding up one quadrant of the dome, and the outside is propped up with many very large and solid buttresses, though a lot of those are the work of Architect Sinan in the sixteenth century.
Topkapi is a collection of large Ottoman pavilions, each containing a different museum. The tiling was impressive; the Chinese porcelain was fairly relaxing; the collection of Assorted Weapons, including seven-foot broadswords with crosses on the quillians and six-foot hand-cannons of inordinate calibre with the barrels inlaid with gold was quite striking; the spectacularly impractical silverware was amusing. The audience-chamber with its carpets embroidered with precious stones sat there as an archetype of oriental despotism; the three treasure-rooms, in which everything was huge, made of hammered gold, and set with emeralds rubies sapphires diamonds topazes ... made you understand why some might yearn for the silence of the desert, the blinding sun on the sand and the purity of sharpened steel. |
After lunch overlooking the Golden Horn, and a weird Turkish dessert consisting of many kinds of dried fruit and beans cooked in apple-flavoured jelly, I left the palace, went to the Nurosmanli mosque (described as baroque, this had vertical walls rather than subdomes, painted (or even, shockingly, bare stone) walls rather than mosaic, and, outside, the last kitten of the trip. |