While Tories distract us with Brexit, the NHS has just slipped out its first price list for treatments

Posted in Uncategorized on June 19, 2019 by telescoper

Don’t say you weren’t warned.

Tom Pride's avatarPride's Purge

Please don’t say you weren’t warned.

Because you’ve been warned time and time and time again the Tories are stealthily privatising the NHS.

This doesn’t mean just handing over hospitals and NHS services to private firms.

It means stealthily introducing actual charges to NHS patients at point of need.

This is all totally ignored by the mainstream press of course.

NHS trusts are now so confident they’ll get away with it, they are openly publishing the very first price lists since the formation of the NHS – for NHS operations, NHS procedures and NHS consultations (see here):

nhs charges 1

PLEASE SHARE if you care about the NHS. Thanks.

View original post

Atmospheric Muons as an Imaging Tool

Posted in The Universe and Stuff with tags , , on June 19, 2019 by telescoper

The other day I came across an interesting paper with the above title on the arXiv. The abstract reads:

Imaging methods based on the absorption or scattering of atmospheric muons, collectively named under the neologism “muography”, exploit the abundant natural flux of muons produced from cosmic-ray interactions in the atmosphere. Recent years have seen a steep rise in the development of muography methods in a variety of innovative multidisciplinary approaches to study the interior of natural or man-made structures, establishing synergies between usually disconnected academic disciplines such as particle physics, geology, and archaeology. Muography also bears promise of immediate societal impact through geotechnical investigations, nuclear waste surveys, homeland security, and natural hazard monitoring. Our aim is to provide an introduction to this vibrant research area, starting from the physical principles at the basis of the methods and reviewing several recent developments in the application of muography methods to specific use cases, without any pretence of exhaustiveness. We then describe the main detector technologies and imaging methods, including their combination with conventional techniques from other disciplines, where appropriate. Finally, we discuss critically some outstanding issues that affect a broad variety of applications, and the current state of the art in addressing them.

This isn’t a new field, but it’s new to me and this paper provides a very nice introduction to it. I’ve taken the liberty of reproducing Figure 3 here to show one application of `muography’..

 

Physics Lectureship in Maynooth!

Posted in Maynooth with tags , , , , , on June 18, 2019 by telescoper

Every now and then I have the opportunity to use the medium of this blog to draw the attention of my vast readership (both of them) to employment opportunities. Today is another such occasion, so I am happy to point out that my colleagues in the Department of Experimental Physics are advertising a lectureship. For full details, see here, but I draw your attention in particular to this paragraph:

The Department of Experimental Physics is seeking candidates with the potential to build on the research strengths of the Department in the areas of either terahertz optics or atmospheric physics. The Department is especially interested in candidates with research experience that could broaden the scope of current research activity. This could include for example terahertz applications in space, imaging, remote sensing and communications or applications of atmospheric physics related to monitoring and modelling climate change. It would be an advantage if the candidate’s research involved international collaboration with the potential for interdisciplinary initiatives with other University institutes and departments.

The deadline for applications is Sunday 28 July 2019 at 11.30pm.

Euclid Updates

Posted in Euclid, The Universe and Stuff with tags , , , , on June 17, 2019 by telescoper

Following the Euclid Consortium Meeting in Helsinki a couple of weeks ago, here are a couple of updates.

First, here is the conference photograph so you can play Spot The Telescoper:

(The picture was taken from the roof of the Finlandia Hall, by the way, which accounts for the strange viewpoint.

The other update is that the European Space Agency has released a Press Release releasing information about the location on the sky of the planned Euclid Deep Fields. Here they are (marked in yellow):

These deep fields amount to only about 40 square degrees, a small fraction of the total sky coverage of Euclid (~15,000 square degrees), but the Euclid telescope will point at them multiple times in order to detect very faint distant galaxies at enormous look-back times to study galaxy evolution. It is expected that these fields will produce several hundred thousand galaxy images per square degree…

Selecting these fields was a difficult task because one has to avoid bright sources in both optical and infrared (such as stars and zodiacal emission) so as not to mess with Euclid’s very sensitive camera. Roberto Scaramella gave a talk at the Helsinki Meeting showing how hard it is to find fields that satisfy all the constraints. The problem is that there are just too many stars and other bits of rubbish in the sky getting in the way of the interesting stuff!

 

For much more detail see here.

 

The Coloured Ball Illusion

Posted in Art on June 16, 2019 by telescoper

This image, created by David Novick, is the most impressive colour illusion I have ever seen: all the balls are actually the same colour, brown.

If you don’t believe me, zoom in on any one of them…

I don’t really know why this fascinating image causes the effect that it does, but think it is a combination of hardware and software issues! The hardware issues include the fact that colour receptors are not distributed uniformly at the back of the human eye, so colour perception is different when peripheral cues are present, and also that their spectal response is rather broad with considerable overlap between the three types of cell. The software issue is something to do with how the brain resolves a colour when there are other colour nearby:nNotice how the balls take on the colour of the lines passing across them..

A Ring of Controversy Around a Black Hole Photo

Posted in The Universe and Stuff on June 15, 2019 by telescoper

This is a long post but well worth reading if you want to know what we really know about the black hole in M87..

Matt Strassler's avatarOf Particular Significance

It’s been a couple of months since the `photo’ (a false-color image created to show the intensity of radio waves, not visible light) of the black hole at the center of the galaxy M87, taken by the Event Horizon Telescope (EHT) collaboration, was made public. Before it was shown, I wrote an introductory post explaining what the ‘photo’ is and isn’t. There I cautioned readers that I thought it might be difficult to interpret the image, and controversies about it might erupt.EHTDiscoveryM87

So far, the claim that the image shows the vicinity of M87’s black hole (which I’ll call `M87bh’ for short) has not been challenged, and I’m not expecting it to be. But what and where exactly is the material that is emitting the radio waves and thus creating the glow in the image? And what exactly determines the size of the dark region at…

View original post 6,013 more words

The End of the Common Travel Area?

Posted in Biographical, Cardiff, Politics with tags , , on June 14, 2019 by telescoper

I’m back in Cardiff for a couple of days after flying from Dublin this morning.

When my flight arrived at Cardiff Airport there was yet again a full passport and immigration check on all passengers.

There is supposed to be a Common Travel Area including the UK and Ireland (as well as the Channel Islands and the Isle of Man), and passport checks are not supposed to be made routinely at borders within the CTA.

I have noticed passport checks happening at Cardiff Airport before (e.g. here and here) but I’ve previously imagined there was some specific reason for them. Passport checks have, however, been carried out every time I have arrived in Cardiff recently and it is now abundantly clear that there has been a material change of policy.

When I got to the desk and handed over my passport I asked the Officer whether these checks were being imposed all the time now. She said yes: there are now full passport and immigration checks on all flights to Cardiff from Dublin.

This is from the UK Government’s website:

Well, if they check all passengers on all flights then that sounds like ‘routine’ to me. In other words the British authorities are violating the Common Travel Area agreement just weeks after undertaking to uphold it.

Did someone say ‘Perfidious Albion’?

Special 1919 Eclipse Centenary Offer!

Posted in History with tags , on June 13, 2019 by telescoper

A little later than planned, a paper what I wrote for Contemporary Physics to commemorate the centenary of the 1919 Eclipse Expeditions has now appeared online. The print edition will be available in due course.

Here is the abstract:

Unfortunately the paper is behind a paywall, but as a special dispensation I am to offer FIFTY free downloads of the paper to friends, colleagues and random people on the internet.

If you’d like to download a FREE copy of the PDF of the paper A revolution in science: the eclipse expeditions of 1919 then you may do so by clicking this link. How’s that for clickbait?

UPDATE: the free copies have now all gone so I removed the link.

To be honest I’m not sure what stops you sending the PDF to anyone else, but apparently those are the rules…

Astronomy Bookalike

Posted in Astronomy Lookalikes on June 13, 2019 by telescoper

It has been pointed out to me that I haven’t contributed anything to my collection of Astronomy Lookalikes recently. My only excuse is that I haven’t really thought of any. I’ll try to get it going again. Suggestions are always welcome.

In the meantime take a look at this book look-alike:

If you click on the picture you can make it bigger.

These two pages are taken from two different books on Astrophysics written about a decade apart by two different authors. This is by no means the only point of similarity between these particular volumes. I wonder if by any chance they might be related?

I couldn’t possibly comment.

Blue Murder in Glasgow

Posted in Biographical with tags , , , , , on June 12, 2019 by telescoper

We have our final meeting of the Examination Board in the Department of Theoretical Physics at Maynooth University tomorrow in the presence of External Examiner who is visiting for the purpose.

For some reason thinking about this impending event reminded me of a strange encounter I had many years ago when I worked at Nottingham University and had almost forgotten about. Perhaps it’s just because it was the same time of year. Anyway, while I remember it I thought I might as well write about it here.

One day in June 2003, when I got home to my house in Beeston after work, I found that a card had been put through my letterbox. It was from Nottingham CID and bore the name of a Detective Sergeant followed by `Vice Squad’. I forget his actual name. Apparently the Officer concerned had called when I wasn’t in and left the note asking me to call back. I was a bit perturbed that it was apparently to do with something under the remit of the Vice Squad but it didn’t give any details except for a telephone number. Anyway, being a cooperative person, I phoned the number and a few days later the policeman came to my house to interview me.

It turned out to have nothing to do with the Vice Squad nor even anything to do with Nottingham. It was to do with an incident in Glasgow that had happened almost a year previously (in 2002): the policeman who interviewed me just happened to be available to run this particular errand on behalf of the Glasgow CID.

The police had traced me because I had paid a bill in a curry house in the Byres Road area of Glasgow’s West End with my credit card. I should explain that the reason I was having a meal in Glasgow that night was that at that time I was External Examiner for the undergraduate courses in Astronomy at the University of Glasgow, a task that involved staying two nights in a B&B near the University. In fact when I spoke to the Police Officer I was about to go to Glasgow again for the same purpose.

I was asked to recall my movements for the evening concerned (24th June 2002). It was almost a year previously and I couldn’t help much, but I did remember that I (along with some companions from the Department) tried to get into the curry house earlier in the evening, but it was very busy so we adjourned to a pub for a pint or two before returning and getting a table. A helpful comment below reminded me that the establishment concerned was  Ashoka in Ashton Lane, in the West End of Glasgow.

 

I could remember only two things really. One was that it was a warm sunny evening and there were lots of people outside drinking in the sunshine. The other that it was getting dark when we left Ashoka after the meal, which at that time of year would make it rather late. The Officer pointed out that my credit card had been charged after 11pm, which fits with that recollection. I had paid for my meal with the intention of claiming the cost on expenses. The food was excellent, by the way.

`Can you describe the other people in the restaurant when you were there?’ he asked me. I could barely remember who was at my table, never mind any strangers, and couldn’t think of anything useful to say at all except that it was very busy.

`What’s this all about?’, I asked the Officer.

It was then revealed to me that somebody had been murdered that night, just around the corner from where I was staying. Actually he had been left for dead in the driveway of his house with serious head injuries received in the early hours of the following morning, and died a few days later. The police strongly suspected he had eaten in the same restaurant we were in, possibly with the person or persons who killed him. The Officer showed me a picture of the victim but it didn’t ring any bells.

Because of the time that had elapsed I wasn’t able to help very much at all, though to be honest I doubt I would have been able to help if I’d been asked the day after the event. I just wasn’t paying much attention, and there wasn’t a row or anything that I might have noticed.

And that was that. Interview over. I signed a witness statement and the Officer left.  I never heard any more about it.  It was obviously a cold case then – otherwise the Police  wouldn’t have been following such tenuous leads – and it’s an even colder case now. I believe the case was featured on Crimewatch or some such, but without success.

The murder (still unsolved) was of a man called Alex Blue. According to Wikipedia:

A businessman from the city’s west end, Blue was found outside his home with head injuries. He died two days later. Blue ran a taxi business with an annual turnover of £7m. One theory is that he was the victim of a house buying scam. He told friends he was in the process of buying a new house and planned to view it the day after he was attacked. It was later discovered the home had never been on the market. Although nobody has been charged with the murder, Blue’s mother and brother are convinced they know who murdered him. His brother said: “I know who was behind this but they got someone else to carry out their dirty work for them.”

It’s very unlikely now that whoever killed him will ever be brought to justice.