Archive for May, 2023

The Rising Trees

Posted in Biographical, History with tags , , , on May 2, 2023 by telescoper
The Shelbourne Hotel, viewed through the trees at the North-East corner of St Stephen’s Green

I was a bit early arriving into Dublin for the concert on Friday so decided to take a walk around St Stephen’s Green. It was a pleasant evening, and the park was quite busy with people, some sitting on the grass and some strolling around as I was. This was 28th April 2023.

The scene must have been very different 107 years ago. The Easter Rising of 1916 started on Easter Monday (24th April of that year), and ended on Saturday 29th. St Stephen’s Green was a focus of the first day of hostilities, as I blogged about here. It is obvious why the rebel forces considered this park an important location to control as it is at the junction of several main roads. On the other hand if you actually visit the location you will see a big problem, namely that the Green itself is surrounded on all sides by very tall buildings, including the swanky Shelbourne Hotel to the North.

When a contingent of about 120 members of the Citizens Army arrived in St Stephen’s Green on Easter Monday, 24th April 1916, they immediately began erecting barricades outside, and digging trenches inside, the Park. They did not, however, have the numbers needed to seize and hold the buildings around it except for the Royal College of Surgeons building to the West.

The following morning, Tuesday 25th April, the British moved two machine guns into position, one in the Shelbourne Hotel (on the 4th floor) and the other in the United Services club, along with numerous snipers. According to eyewitness accounts, almost every window in the hotel had a sniper in it. From these vantage points British soldiers could shoot down into the Park, making it impossible for the rebels to move around safely. The position inside the Green being untenable the Rebels effected an orderly (but perilous) withdrawal to the Royal College of Surgeons which they had fortified for the purpose. And that’s where they stayed until the surrender at the end of the Rising.

St Stephen’s Green is full of mature trees – there are about 750 at present – which would have been in full leaf at the time. Something I have occasionally wondered about is the extent to which the trees in late April might have afforded the rebels cover from the snipers and machine guns aimed into the park. It being the same time of year when I visited on Friday, and assuming the trees looked roughly the same as in 1916, I had a look around to see what protection they might have offered.

The answer, as you can see from the photo, is not very much…

New Publication at the Open Journal of Astrophysics

Posted in OJAp Papers, The Universe and Stuff on May 1, 2023 by telescoper

It’s time for the announcement of yet another new paper at the Open Journal of Astrophysics. In fact it’s a little overdue, because we published this one on Friday 28th April but what with the impending holiday weekend, it slipped my mind to post it on here.

The latest paper is the 15th paper so far in Volume 6 (2023) and the 80th in all. This is another one for the folder marked Cosmology and Nongalactic Astrophysics and its title is “JAX-COSMO: An End-to-End Differentiable and GPU Accelerated Cosmology Library”. The software and related  documentation referred to in this paper can be found here.

The lead author of this paper is Jean-Eric Campagne of the Université Paris-Saclay in France, and there are nine co-authors based in France, Germany, USA, UK, China and Switzerland.

Here is a screen grab of the overlay which includes the  abstract:

 

You can click on the image of the overlay to make it larger should you wish to do so. You can find the officially accepted version of the paper on the arXiv here.

Lá Bealtaine shona daoibh go leir!

Posted in Biographical, Education, Maynooth on May 1, 2023 by telescoper

Spring on Campus

As well as being International Workers Day, today, 1st May, is Beltane (Bealtaine in Irish) is an old Celtic festival. The month of May is called Bealtaine in Irish and May Day is called Lá Bealtaine, which is one of the so-called Cross-Quarter Days that lie (roughly) halfway between the equinoxes and solstices, in this case the Spring Equinox and the Summer Solstice. The upshot of all this is that today is a Bank Holiday, so I have the day off.

If the weather holds I shall spend a bit of time in the garden. Yesterday was quite warm but very showery. I tried three times to hang out my washing to dry in broad sunshine only to have to bring it in again when a torrential downpour arrived. Eventually I gave up.

On the corresponding days last year, the year before and the year before that I was wondering about how the pandemic would pan out. Back on May 1st 2020 I didn’t think it would last until May 2021 and back in 2021 I did not forecast that we would still have over a thousand new infections every day in May 2022.  Fortunately the pandemic seems to be dying down, though the consequences will be with us for some time.

After toady’s holiday we have four days left of teaching term at Maynooth University, then there’s a study week for the students and then the exams begin. I’ve more-or-less managed to keep on track so my remaining classes will be mainly revision. It will be quite a busy week though. Friday 5th May is the deadline for this year’s Computational Physics projects, so I’m anticipating last-minute queries all week. As well as this, and revision lectures and tutorials, I will be attending the annual Dean’s Lecture on Wednesday and attending a concert performance by members of Irish National Opera in the Aula Maxima on campus on Thursday as part of the Arts and Minds Festival.