Archive for March, 2025

Through a wine glass, darkly…

Posted in Euclid, The Universe and Stuff with tags , , , on March 7, 2025 by telescoper

Usually I disapprove of using a wine glass for any purpose other than drinking wine, but here’s a very neat short video by Phil Marshall explaining how you can use a one to simulate a strong gravitational lens such as the system that produced the wonderful Einstein ring recently discovered by Euclid. More specifically it shows how perfect alignment leads to a ring whereas other configurations can produce multiple images or arcs.

If you’re planning to try this at home, please remember to empty your glass beforehand.

Another Edgeworth!

Posted in History with tags , , , , , , on March 6, 2025 by telescoper
Edgeworthia chrysantha Grandiflora (Paper Bush)

Time for another addition to a mini-series of posts about the Edgeworth family (see here and here); an Edgeworth expansion, if you will. This morning I stumbled across the name of a plant, Edgeworthia chrysantha Grandiflora, also known as the Paper Bush (because it is used in Japan to make high quality paper). It is also available for purchase in Ireland (e.g. here). I think I’ll buy one for the garden!

When I saw the name of this interesting-looking shrub, I immediately suspected it was named after a member of the illustrious Irish Edgeworth family and so it was. The genus was named in honour of Michael Pakenham Edgeworth, an Irish botanist and official in the Bengal Civil Service, then stationed in India, and for his half-sister, writer Maria Edgeworth. Michael and Maria were among 22 children fathered by Richard Lovell Edgeworth, who was a founder member of the Royal Irish Academy. In a manner not untypical of the Anglo-Irish landed gentry, the Edgeworths renamed their local town, which is in County Longford, from Meathas Troim (anglicized form Mostrim) to Edgeworthstown. Michael Pakenham Edgeworth lived from 1812 until 1881 was a member of the Linnaean Society and, among other things, pioneered the use of photography in botanical studies.

Lecture Recordings Again

Posted in Cardiff, Covid-19, Education, Maynooth with tags , , , , , on March 5, 2025 by telescoper

Long before the pandemic restrictions – was it really five years ago that all that started? – I posted an item about an innovation I encountered when I moved to Sussex in 2013, namely lecture capture facilities which

…allow lecturers to record videos of their own lectures which are then made available for students to view online. This is of course very beneficial for students with special learning requirements, but in the spirit of inclusive teaching I think it’s good that all students can access such material. Some faculty were apparently a little nervous that having recordings of lectures available online would result in falling attendances at lectures, but in fact the evidence indicates precisely the opposite effect. Students find the recorded version adds quite a lot of value to the “live” event by allowing them to clarify things they might not have not noted down clearly.

A few years later, when I did some teaching back in Cardiff, I discovered that lecture recording had become normal practice there too. The main difference was that Sussex had a proper policy on important matters such as who could see the recordings, and what they could be used for, which allayed some staff fears about snooping and the inhibition of academic freedon; the policy at Cardiff had not been fully developed in advance of the rollout of lecture capture, which I think was a big mistake.

Anyway, before the pandemic we didn’t really have any facilities at Maynooth University for recording lectures so it certainly wasn’t normal practice. With the onset of Covid-19 lecture recordings and live streams became the only way to carry out teaching and we lecturers made the best of what we had at home. A couple of years ago, after restrictions were lifted, I posted about a meeting between student representatives and staff in the (then) Department of Theoretical Physics during which students criticized, among other examples of inadequate teaching resources. Part of the reason for this is the drastic shortage of student accommodation which means many students have to commute long distances to campus and have difficulty doing that every day for lectures.

I – and I’m speaking personally here – wish we could offer lecture recordings as routine. Unfortunately, however, and much to my disappointment, Senior Management at Maynooth University has discouraged lecture recording as a matter of policy and has not invested in the technology required to enable it, so it is not practicable anyway.

In my view the benefits of lecture capture far outweigh the disadvantages, and we should incorporate recordings of lectures as part of our standard teaching provision, as a supplement to learning rather than to replace face-to-face sessions. Every student learns in a different way and we should therefore be doing as much as we possibly can to provide a diverse range of teaching resources so that each can find the combination that suits them best. Technology allows us to do this far better now than in the past.

Some really enjoy live in-person lecture sessions, especially the ability to interact with the lecturer and the shared experience with other students, but others don’t like them as much. Others have reasons (such as disability) for not being able to attend in-person lectures, so providing recordings can help them. Others still have difficulty attending all lectures because of a dratic shortage of student accommodation. Why not in any case provide recordings for everyone? That seems to me to be a more inclusive approach.

The problem with lecture capture in Maynooth is that we will need to improve the cameras and recording equipment in the large lecture rooms to make it possible for lectures with a significant mathematical content. The existing setups in teaching rooms do not easily allow the lecturer to record material on a whiteboard or blackboard. In Cardiff, for example, the larger rooms had more than one camera, usually one on the lectern and one on the screen or whiteboard (which has to be placed further away and therefore needs to be of higher resolution). In Maynooth we only have small low-resolution cameras in the teaching rooms. In fact I have far better facilities in my study at home – provided at my own expense – than my employer is prepared to provide on campus.

Anyway, the reason for mentioning all this is that I saw an article today in the University Times (a student newspaper based at Trinity College, Dublin). I can only infer that someone at Trinity has floated the idea of mandatory lecture recordings, because the piece argues against them even with

…established guidelines for their use, re-use, storage, and dissemination, and a ban of their use during industrial action.

I think a properly negotiated agreement with the Trade Union representing staff (e.g. IFUT, of which I am a member) covering these points would allow me to accept mandatory lecture recordings. Worries about covert monitoring or unauthorized dissemination on social media would hopefully be assuaged by such an agreement. A particular issue in the UK, given the current meltdown of its higher education sector, Senior Management may sack lecturers to save money but keep using their recordings. That would be unconscionable, but that doesn’t mean it won’t be tried.

FRS: Failure at the Royal Society

Posted in Politics with tags , on March 4, 2025 by telescoper

A while ago I posted an item about the Royal Society’s failure to take proper action against Elon Musk. The petition I linked to then gained almost 4,000 signatures – including quite a number of people I know. Well, yesterday evening that venerable institution held a meeting attended by over 150 of its Fellows. The meeting was behind closed doors but it seems to have been rather fractious. It also seems that Elon Musk remains a Fellow.

Here is the resulting statement in all its bland uselessness:

At a meeting this evening of the Royal Society, Fellows agreed on the need to stand up for science and for scientists around the world in the face of the growing challenges science faces.

Concern was expressed, in particular, about the fate of colleagues in the US who are reportedly facing the prospect of losing their jobs amid threats of radical cutbacks in research funding.

Fellows, over 150 of whom attended tonight’s meeting, were united in the need for the Society to step up its efforts to advocate for science and scientists at a time when these are under threat as never before and yet at the same time have never been more necessary for humanity at large.

The Society agreed to look at potential further actions that might help make the case for science and scientific research and counter the misinformation and ideologically motivated attacks on both science and scientists.

Is that the best they could come up with?

Fat Tuesday again…

Posted in Jazz with tags , , , on March 4, 2025 by telescoper

Well, it’s Shrove Tuesday, Pancake Day, Mardi Gras and Fat Tuesday which gives me four excuses to post this lovely old record made by Humphey Lyttelton’s Paseo Jazz Band in the early Fifties. That’s the band that featured Humph’s regular crew alongside a number of London’s marvellous West Indian musicians of the time, hence the abundance of percussion and the resulting infectious calypso beat. I’ve posted this before but the link died, so here it is again. Enjoy!

If Oscar Wilde were a Torus

Posted in mathematics with tags , , , , on March 3, 2025 by telescoper

Term goes on…

Posted in Biographical, Education, Maynooth with tags , , , , , on March 2, 2025 by telescoper

Here we are, about to start the fifth week of the Spring semester at Maynooth University. Teaching isn’t going too badly, but I have come to realize that I have a lot of continuous assessment marking to do – classs tests and mini-projects for Computational Physics and assignments for Particle Physics. The numbers of students involved are 32 in the first case and 23 in the second, but I have to do all the corrections myself. Ho hum. Still, I’m enjoying teaching particle physics again after a gap of 15 years or so so I can’t complain about that.

Last week saw some important achievements by research students. Two students in the Department of Physics – one of them supervised by me – submitted their PhD theses last week. Nominations of examiners have to be approved by Faculty and Academic Council but that should be a formality and we then have the viva voce examinations, so the process is not over yet, but the submission of a thesis is a landmark in itself and is to be celebrated.

Something less worthy of celebration is the ongoing chaos at Maynooth over funding for future research students. You may recall that I posted about the terrible decision by the Management of Maynooth University to scrap the John and Pat Hume Doctoral Scholarships and followed this up with another post suggesting the decision might be reversed and another pointing out that it hadn’t been. The Hume scheme has been paused for a “review”. That review was actually completed in January. It is now March and academic staff have still had no word about the status of the Hume Scholarships. Someone is stalling.

I have received a number of enquiries in recent weeks from prospective students about when applications would open as I’m sure is also the case for several of my colleagues. It has been very depressing to have to reply saying that I have no idea. As far as I know the scheme is suspended indefinitely. It’s now effectively too late for this year anyway, as most prospective students will already have lined up offers elsewhere. Only students not able to secure a place elsewhere will be available to apply if and when the scheme does open.

The timing of this is especially sad for the new Department of Physics. Our final-year Theoretical Physics class sizes are larger than ever but the Maynooth is sending them a very clear signal that it doesn’t want any of them to stay here for their PhDs.

A Poem for St David’s Day

Posted in Poetry with tags , , , , on March 1, 2025 by telescoper
Daffodils photographed yesterday at Maynooth University

It’s St David’s Day so, notwithstanding the fact that I’ve just watched Leinster beat Cardiff 42-24 at Rugby,

Dydd Gŵyl Dewi Hapus!

On this day I usually post a poem by a Welsh poet. This, by Dylan Thomas, which was published in 1936 and seems to me to be rather topical, featured in the concert I went to about a month ago.

The hand that signed the paper felled a city;
Five sovereign fingers taxed the breath,
Doubled the globe of dead and halved a country;
These five kings did a king to death.

The mighty hand leads to a sloping shoulder,
The finger joints are cramped with chalk;
A goose's quill has put an end to murder
That put an end to talk.

The hand that signed the treaty bred a fever,
And famine grew, and locusts came;
Great is the hand that holds dominion over
Man by a scribbled name.

The five kings count the dead but do not soften
The crusted wound nor pat the brow;
A hand rules pity as a hand rules heaven;
Hands have no tears to flow.