Panama

Posted in History, Jazz with tags , , , on April 4, 2016 by telescoper

For some reason today’s news made me think of this famous old record by Bunk Johnson.

Bunk Johnson was born in New Orleans way back in 1879 and he made his name playing trumpet in the very early days of jazz, including – if his own account can be believed – a stint with the legendary Buddy Bolden.  He was regarded by many, including Louis Armstrong no less, as one of the top trumpeters in New Orleans in the period between 1905 and 1915. Jazz had begun with the  marching bands that performed in New Orleans but then largely moved into the bordellos of Storyville, the biggest (legal) red light district in the history of the United States. When Storyville was closed down in 1917 most professional jazz musicians lost their only source of regular income. However, a few years later, in 1919, the United States Senate proposed the 18th Amendment to the Constitution which prohibited the manufacture, distribution and sale of alcohol for human consumption and ushered in the era of Prohibition. This turned Chicago into a bootlegger’s paradise and jazz musicians flocked there to perform in the numerous speakeasies. That’s why the great New Orleans Jazz records of the 1920s were all made in Chicago and it also caused the music to evolve in new directions.  Bunk Johnson did not join the mass exodus to Chicago and his career faded into obscurity, ending entirely in 1931 when he had his front teeth knocked out in a brawl and could no longer play the trumpet.

However, in 1942, Bunk Johnson was rediscovered as a very old man by some young jazz fans who travelled to New Orleans and recorded him playing with a band of local musicians in the basement of a house courtesy of a new set of dentures. Despite the poor sound quality of the recording, the resulting tracks proved incredibly popular, ushering in the New Orleans Revival that began in the United States and then propagated across to Europe after the war to the extent that many revivalist bands even sedulously acquired the “recorded-in-a-garage” sound. Bunk Johnson passed away in 1947 but George Lewis, who plays clarinet on this track, carried the flag for “authentic” New Orleans jazz for many years after that, visiting Europe on many occasions. My Dad played the drums with him a few times..

P.S. I’ve always felt particularly sorry for  Walter Decou, who played piano on the famous Bunk Johnson records of 1942, because apparently he was pounding away like a good ‘un but you can barely hear a note from him on any of them!

 

The End of Hitomi..

Posted in The Universe and Stuff with tags , , , on April 4, 2016 by telescoper

Time for a gloomy Monday update to my recent post about the Japanese X-ray satellite Hitomi.

First here’s a new plot of the debris (via Jonathan McDowell):

Hitomi

This shows more pieces of debris than the one I showed previously, and also demonstrates that some of the pieces are in rapidly-decaying orbits. A rough estimate suggests that some of these – those in the lower right of the diagram- will burn up in the atmosphere within a week or so. This behaviour is consistent with them being rather light fragments, on which the effect of drag is greater, and consequently possibly rather small.  Their behaviour does not therefore necessarily imply anything too catastrophic about the main spacecraft.

However, there is now strong evidence that the main spacecraft actually did break up fairly completely rather than shedding a few pieces of casing or whatever. Two of the brightest pieces are of roughly equal size and, ominously, the original identification of one of them with the main part of the spacecraft has been shown to be wrong. Furthermore, no signals have been received from the onboard beacon for six days now. It all sounds very terminal to me.

2-hitomispacec

So what happened? Of course I don’t know for sure, but the above picture suggests the possibility of an explosion (possibly violent outgassing of cryogens needed for the instruments near the rear of the main body of the vehicle). The structure to the rear of the vehicle is a deployable optical bench used to increase the focal length of the telescope for hard X-ray work. This could well have broken off during such an explosion, as could all or part of the solar panels used to supply power to the satellite.

The Japanese Space Agency JAXA has not officially given up on Hitomi (formerly known as ASTRO-H) but I think the hopes of most commenters I’m aware of have now faded away.

It’s all very sad.

 

 

 

Have you been threatened with legal action by “Scientists for Britain”?

Posted in Politics, Science Politics with tags , , , , , on April 3, 2016 by telescoper

Back in circulation after a short break I hope to write a few pieces about why I support the case for the United Kingdom to remain in the European Union, partly because it’s good for science, but also because it’s good for many other reasons.

But before I do that, I feel I have to do a quick post about the extremely unpleasant antics of an organization called “Scientists for Britain“, or rather the anonymous person or persons operating their Twitter feed.

Last Saturday I found myself in receipt of a message, apparently sent by this outfit, that explicitly threatened legal action on grounds of libel because of a comment I had made on one of their posts on Twitter which was alleged to be “disparaging”. I was refrained from referring the sender of this intentionally intimidatory message to the response given in Arkell versus Pressdram but it soon became clear that a number of other scientists on Twitter had received similar threats.Then, fortunately for us, in stepped renowned legal journalist David Allen Green, who blogs as Jack of Kent and is something of a specialist in libel law. He made it quite clear that the threats sent out by Scientists for Britain had no basis whatsoever in law, not least because you can’t libel an anonymous person. I hadn’t said anything even remotely actionable anyway.

Within hours, all the threatening messages had been deleted by Scientists for Britain, and they also blocked those of us to whom they had sent them in the first place, including myself. There are such things as screen grabs, however…

This social media car crash would be very funny were there not something very sinister behind it. I’m all for healthy robust and vigorous debate on the issue of the United Kingdom’s membership of the European Union ahead of the forthcoming referendum, but bullying those you disagree with by means of threats of legal action is no way to make your case. Also, for the record, I will point out that I have seen no evidence that the anonymous operator of the Scientists for Britain Twitter feed, who delights in issuing unwarranted libel threats, is a actually scientist at all. I very much doubt that is the case, in fact. Why else would Scientists for Britain be so obsessive about their anonymity? Even their response to a letter signed by 150 Fellows of the Royal Society is unsigned….

I am posting this information here in an attempt to find out how many other scientists  Scientists for Britain have tried to silence through legal threats.  If this has happened to you, please let me know via email, Twitter, or via the comments box  of this blog (below).

If Scientists for Britain wish to comment they are welcome to do so below, although please note my comments policy: I do not accept postings from anonymous individuals.

 

 

A Bridge Question

Posted in Uncategorized with tags , on April 3, 2016 by telescoper

image

Catching up on all the important journals after a short holiday I found the above deal in the Bridge column of The Oldie.

I’m not sure I would have the courage to bid to 7NT as South – 7♦ seems a more likely contract – but in the game described that’s what happened.

West led the 8♦, which in my view plays directly into South’s hands. Declarer already has 12 tricks guaranteed, and the 13th needed for a Grand Slam comes easily if West holds the Q♣, which is indeed the case. However, South didn’t even need the club finesse to succeed in taking all 13 because East discarded two clubs as South played off the obvious Diamond and Spade winners, so the Queen fell to either the A♣ or the K♣ on a club lead.

My question, though, as a mediocre player, is why did West lead a diamond?  South had opened with 1♦, and North had jumped to 3♦  before South’s slam try with 4NT (Blackwood). Against 7♦ West’s would have been a standard defensive lead of a trump, but in No Trumps surely it is better here to follow convention and lead the 4th highest of the longest suit, ie the 8♥? South would then have to play the Ace from dummy, which at least destroys one line of communication as the A♦ can no longer provide an entry to dummy.

I think Declarer still makes the contract but my question is, against this lead, does South have to try the club finesse?

Wrote for Luck

Posted in Uncategorized on April 1, 2016 by telescoper

Some interesting comments on frequencies in the National Lottery. I stopped playing when it went up to £2. I figured a pound wasn’t too high a price for a small frisson of excitement when the draw was taking place, but two pounds was too much…

quantixed's avatarquantixed

Fans of probability love random processes. And lotteries are a great example of random number generation.

The UK National Lottery ran in one format from 19/11/1994 until 7/10/2015. I was talking to somebody who had played the same set of numbers in all of these lottery draws and I wondered what the net gain or loss has been for them over this period.

The basic format is that people buy a line of numbers (6 numbers, from 1-49) and try to match the six numbers (from 49 balls numbered 1-49) drawn from a machine. The aim is to match all six balls and win the jackpot. The odds of this are fantastically small (1 in ~14 million), but if they are the only person matching these numbers they can take away £3-5 million. There are prizes for matching three numbers (1 in ~56 chance), four numbers (1 in ~1,032),  five numbers (1…

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The Trouble with Hitomi

Posted in The Universe and Stuff with tags , , on March 31, 2016 by telescoper

One of the stories I’ve been following a bit while taking a break from blogging has been that of the Japanese X-ray satellite Hitomi (formerly known as ASTRO-H), which was launched into a low-Earth orbit on February 17th 2016, experienced a “communication anomaly” on Saturday March 26th. It has now become clear that this was more than a simple communications glitch. Astronomer Jonathan McDowell posted this diagram on Twitter that showed a sudden decrease in the orbital period of the satellite:CekOyLxXEAAeNxF

Students of orbital dynamics will know that a decrease in orbital period corresponds to a decrease in the semi-major axis of the orbit, so Hitomi actually fell during this episode. It dropped only slightly – look at the % change on the graph – but by enough to be very worrying.

The plot thickened still further when radar detected five pieces of debris near the satellite and visual observations indicated the spacecraft to be tumbling rapidly. That suggested a very grim picture.

Putting the evidence together it seems that some kind of explosive event – possibly connected with out-gassing of cryogenic material from one of the on-board experiments – had damaged the satellite, changed its orbit and set it spinning uncontrollably.

Since then ground stations have picked up some signals from Hitomi, which is good news,  but these broadcasts are just from the on-board beacon. It has not yet proved possible to communicate with the attitude control system which is the only way to get it back into a stable state.

Obviously it’s touch and go as to whether the Japanese Space Agency JAXA will be able to regain control of Hitomi, but at least there’s more hope than on Saturday when many of us thought the vehicle had fallen apart. In fact the pieces of debris reported may be rather small (ten cm or so is detectable) and the main body of the telescoper may be intact. Maybe.

Update: April 1st. Tracking facilities are now reporting 11 pieces of debris, and also suggesting the object whose period is plotted in the above graph may not be the main part of the spacecraft. This does not sound good.

Update: April 2nd. The debris from Hitomi has now spread out due to different orbital speeds. The two largest pieces are both spinning out of control. I would say at this point that hope of a recovery has now disappeared. It’s very sad.

How to cite social media in academic writing

Posted in Uncategorized on March 30, 2016 by telescoper

I have often wondered how to do this properly. Now I know!

I am told my blog has been cited in the literature a few times but I have been unable to find any evidence for this as I don’t think there’s any mechanism for tracking citations to blogs. Or is there?

Sue Beckingham's avatarSocial Media for Learning

Image source: https://en.wikipedia.org/wiki/Wikipedia:Citation_needed Image source: https://en.wikipedia.org/wiki/Wikipedia:Citation_needed

Referencing and citation is an important part of any writing. This post looks at some recommendations and consideration when citing social media. Citations have several important purposes:

  • to uphold intellectual honesty (or avoiding plagiarism),
  • to attribute prior or unoriginal work and ideas to the correct sources, to allow the reader to determine independently whether the referenced material supports the author’s argument in the claimed way,
  • and to help the reader gauge the strength and validity of the material the author has used. (Wikipedia)

At Sheffield Hallam University (SHU) the Guide to Referencing offers detailed guidance for producing citations and references according to the Harvard method in the Harvard-SHU style recommended by the library. You may be asked to use another method, or a variation of the Harvard style. If this is the case, you may wish to refer to guidance that matches this style. However the recommendations below…

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Farewell, Independent, and thanks for all the dictionaries..

Posted in Biographical, Crosswords, Uncategorized with tags , , , , , on March 30, 2016 by telescoper

I thought I’d resume blogging activity rather gently with a short post to mark the end of an era. Both the Independent and the Independent on Sunday have ceased to exist, at least in their print editions.  It was about three years ago that I switched from the Observer to the Independent on Sunday, which involved switching from the Azed cryptic crossword to Beelzebub for my most testing weekly crossword challenge. I stopped doing the Saturday Prize Cryptic puzzle in the Saturday Guardian too, in favour of the Independent Saturday Prize crossword in the Independent which immediately paid dividends in terms of prizes!

For crossword aficianados both the Azed and Beelzebub crosswords are composed by strict adherents of the rules set by the great Ximenes and both feature grids with no black squares, in contrast to the more normal Everyman puzzle. Jonathan Crowther, who sets the Azed puzzles is the successor to Ximenes in the Observer; he’s been setting puzzles there since 1971.

Anyway, the last Independent on Sunday was published on Sunday 20th March and it included a list of the winners of the last two Beelzebub puzzles; the very final one was No. 1,358:

Beelzebub

It’s a nice way to mark the end of an era! One last dictionary to add to the collection. I’ve completely lost track of the number of books of words I’ve won from the weekly puzzles in the Independent, but it’s certainly more than 50. I’ve given many away but there’s still a large stack in Dorothy’s office.

Anyway, I spent some of my Easter weekend off doing the Guardian  prize crossword (extra-large size, but quite easy) followed by Everyman and Azed in the Observer. I guess that’s my diet from now on…

 

Interlude

Posted in Uncategorized on March 19, 2016 by telescoper

For reasons I’d rather not go into at the moment, I’ve decided to take a break from blogging for a while. I’ll probably be back after Easter, but in the meantime there will be a short intermission.

 

 

More fine structure silliness …

Posted in Bad Statistics, The Universe and Stuff with tags , on March 17, 2016 by telescoper

Wondering what had happened to claims of a spatial variation of the fine-structure constant?

Well, they’re still around but there’s still very little convincing evidence to support them, as this post explains…