Archive for January, 2021

Cold Spell

Posted in Biographical, Maynooth on January 9, 2021 by telescoper

It’s bitterly cold in Maynooth today. We haven’t had much snow but it sure is freezing. As I write it’s 1pm and the temperature is only -4°C. I went to put some stuff in the wheelie bin just now but the lid was frozen shut.

At least I’ve now figured out how to switch this thing on, so I’m nice and cosy indoors.

Outside it’s a different story though at the moment the garden is full of birds tucking into the food I’ve put out for them. They need food to maintain their body temperature or they will freeze to death. I can tell you that these days they’re emptying the feeders at a considerable rate of nuts.

The birds seem to be getting a bit more adventurous. The other day I went out to out refill the bird feeders and the robin who seems to think he’s in charge of my garden bobbed into the kitchen through the open door. He looked around, seeming very unimpressed, did a little poop on the floor and left the way he came in.

The robin is pretty much constantly visible in the garden these days, patrolling his territory and occasionally picking fights with other birds. I saw him have a go at a jackdaw yesterday. You’ve got to admire his nerve.

I’ve seen the resident wren a few times too. Wrens only eat insects so I was curious as to how they survive the winter. I’m reliably informed however that there are still plenty of insects (and other arthropods) around at this time of year. Many hibernate in various crevices (under logs, stones etc., or in nests). Other insect species are still active as adults throughout winter, e.g. smaller flies and moths, and some true bugs.

Meanwhile the swans on the Royal Canal have been having to cope with the ice by learning to skate (not entirely successfully):

Anyway hopefully the extreme cold will keep people indoors to reduce the rate of Covid-19 transmission.

There’s a Moose Loose Aboot this Hoose!

Posted in Covid-19, Maynooth, Music with tags , on January 8, 2021 by telescoper

Artist’s Impression

I am working from home at the moment owing to Covid-19 restrictions on campus activity but I have been informed by on campus staff that an unauthorized mouse bas been seen in the Department of Theoretical Physics. This is a very serious situation as access to the Science Building is for essential work only and this does not include rodents, even if they have a PhD. Furthermore, the mouse is not wearing a face mask and, from what I have heard, is not observing proper sanitary procedures.

More importantly, our Covid-19 protocols require all visitors to the Department to be in receipt of a letter authorizing their presence. I have contacted Human Rodent Resources and no such letters have been issued.

I have therefore instructed all staff and students in the Department that if they see this mouse they should instruct it to leave and that any refusal to comply will be met with disciplinary action, initially taking the form of a formal written warning but escalating if necessary to a meeting with Maynooth University Library Cat.

There now follows a  message concerning these developments from Professor Brian Dolan.

I hope this clarifies the situation.

Beard Wearers who stormed Capitol building condemned for bringing hirsute into disrepute

Posted in Beards, Politics with tags , , , on January 7, 2021 by telescoper

Here is an important perspective on yesterday’s shocking scenes in Washington DC. There’s no question that if Abraham Lincoln were alive today he’d be turning in his grave.

But seriously though, how come the Police presence was so thin that this rabble managed to get into the Capitol buuldings more-or-less unchallenged? Surely they knew what was going to happen?

kmflett's avatarKmflett's Blog

Beard Liberation Front

7th January

Beard Wearers who stormed US Capitol building condemned for bringing hirsute into disrepute

The Beard Liberation Front, the informal network of beard wearers, has condemned beard wearers who stormed the Capitol building in Washington on 6th January for bringing the hirsute into disrepute.

The campaigners, who promote positive images of the hirsute, say that while beard wearers were a minority amongst those trying to disrupt a legislative session confirming Joe Biden as the next President, they were a significant minority.

Two alt-right to fascist groups in particular appear to have been involved. The crazed conspiracy theorist group QAnon is not particularly associated with beards.

However the all-male Proud Boys are frequently to be seen with beards. Founder Gavin McInnes who was born in Hitchin but resides in the US is a noted beard wearer.

The BLF says that the Proud Boys have worked…

View original post 98 more words

Remote Exam Time

Posted in Education, Maynooth with tags , , , on January 7, 2021 by telescoper

It’s the day before the start of the January examination period at  Maynooth University so I thought I’d do a quick post on the topic of examinations or, as they are right now, online timed assessments.

First, for readers elsewhere, full-time undergraduate students at Maynooth what is called 60 “credits” in a year, usually split into two semesters of thirty credits each. This is usually split into 5-credit modules with an examination in each module at the end of each semester. Projects, and other continuously-assessed work do not involve a written examination, but the system means that a typical student will have at least 5 written examination papers in January and at least another 5 in May.  This is very similar to the system in most UK universities that I am aware of except that a full year’s work over there is 120 credits so there’s a conversion factor of 2:1. A 5-credit module in Ireland would be a 10-credit module in the United Kingdom, for example, but otherwise the system is similar.

Each examination is usually of two hours’ duration. We’ve kept that length after moving examinations online, although students are given extra time to scan and upload their answers. The question papers themselves have been slightly adapted online use by having much less “bookwork”. Generally these asssessments are unsupervised and students are allowed to consult notes and textbooks so there is little point in asking them to copy out standard derivations and formulae. That means we can concentrate on the problem-solving aspects of theoretical physics, which are the most interesting bits (and perhaps the most challenging).

One big difference between our examinations in Theoretical Physics in Maynooth and those at other institutions I’ve taught at in the UK is that most of the papers here offer no choice of questions to be answered.  A typical format for a two-hour paper is that there are two long questions, each of which counts for 50 marks. Elsewhere  one normally finds students have a choice of two or three questions from four or five on the paper.

One  advantage of our system is that it makes it much harder for students to question-spot in the hope that they can get a good grade by only revising a fraction of the syllabus. If they’re well designed, two long questions can cover quite a lot of the syllabus for a module, which they have to in order to test all the learning outcomes. To accomplish this, questions can be split into parts that may be linked to each other to a greater or lesser extent to explore the connections between different ideas, but also sufficiently separate that a student who can’t do one part can still have a go at others. With such a paper, however, it is a  dangerous strategy for a student to focus only on selected parts of the material in order to pass.

As an examiner, the Maynooth style of examination also has the advantage that you don’t have to worry too much if one question turns out to be harder than the others. That can matter if different students attempt different questions, but not if everyone has to do everything.

But it’s not just the number of questions that’s important, it’s the duration. I’ve never felt that it was even remotely sensible for undergraduate physics examinations to be a speed test, which was often the case when I was a student. Why the need for time pressure? It’s better to be correct than to be fast, I think. I always try to set examination questions that could be done inside two hours by a student who knew the material, including plenty of time for checking so that even a student who made a mistake would have time to correct it and get the right answer. If a student does poorly in this style of examination it will be because they haven’t prepared well enough rather than because they weren’t fast enough.

The structure of the Maynooth examinations at more introductory level is rather different, with some choice. In my first year module on Mechanics & Special Relativity, for example, there is a compulsory first question worth 50 marks (split into several pieces) and then the students can pick two out of three shorter questions worth 25 marks each. This is a somewhat gentler approach than with the more advanced papers, partly adopted because we have quite a few students doing the General Science degree who taking Mathematical Physics as one of their 4 first-year subjects but will not be taking it further.

As both my examinations are not until next week, I’ll have to wait to find out how my students have done. This will be the examination taken at University level for most of my class, so let me take this opportunity to pass on a few quick tips.

  1. Try to get a good night’s sleep before the examination!
  2. Be ready well before the start and try to ensure you won’t be disturbed for the duration.
  3. If you’re doing an unsupervised examination
  4. Read the entire paper before starting to answer any questions. In particular, make sure you are aware of any supplementary information, formulae, etc, given in the rubric or at the end.
  5. Start off by tackling the question you are most confident about answering, even if it’s not Question 1. This will help settle any nerves.
  6. Don’t rush! Students often lose marks by making careless errors. Check all your numerical results on your calculator at least twice and – PLEASE – remember to put the units!
  7. Don’t panic! You’re not expected to answer everything perfectly. A first-class mark is anything over 70%, so don’t worry if there are bits you can’t do. If you get stuck on a part of a question, don’t waste too much time on it (especially if it’s just a few marks). Just leave it and move on. You can always come back to it later.

Oh, and good luck to anyone at Maynooth or elsewhere taking examinations in the next few weeks!

P.S. It snowed overnight in Maynooth, although only a centimetre or so…

And the most viewed paper at the Open Journal of Astrophysics in 2020 is…

Posted in Open Access, The Universe and Stuff with tags , , , , , , on January 6, 2021 by telescoper

Yesterday I was looking at the Publishing Analytics tool on the Open Journal of Astrophysics to see which paper(s) had attracted the most interest in 2020. The winner in terms of  page views is  this paper, A Beginner’s Guide to working with Astronomical Data. Here is a grab of the overlay:

You can find the arXiv version of the paper here.

The author is Markus Pössel of the Haus der Astronomie at the Max Planck Institute for Astronomy in Heidelberg (Germany). This is a long paper – 71 pages with over a hundred figures – that gives a comprehensive introduction to the various kinds of astronomical data and techniques for working with such data. This paper has obviously attracted a lot of interest from many different kinds of people, especially  students doing undergraduate projects involving astronomical data (and their supervisors). It has had more than three times as many views as the runner-up.

It’s interesting to note that this paper has not yet obtained any citations from academic papers through the Crossref system and it may never that because of the kind of paper it is. Nevertheless, I think this is a valuable resource for the astronomical community and I am very glad we published it. I do hope, however, that anyone who does use this paper does remember to cite it!

It is perhaps also worth mentioning that we do not track download statistics for the papers we publish. This is because the PDF files are held on the arXiv, which does not publish download statistics for individual papers.

Níl tuile dá mhéad nach dtránn

Posted in Biographical, Covid-19 on January 5, 2021 by telescoper

The title of this post is an old Irish saying that in English means “There’s no flood so high that it won’t recede”. The relentless increase in Covid-19 cases over the last few days is starting to make me wonder whether it is true.

Even with 7-day averaging and a logarithmic y-axis the rise looks very steep. On a linear y-axis the new cases look like this:

It’s even more dramatic without the 7-day smoothing:

The numbers for deaths on a linear scale look like this:

After doing extraordinarily well through the summer, things have gone very badly wrong. The standard measure using for comparing countries is the 14-day incidence rate per 100,000 population. On that measure Ireland is now on 674.4, with some counties over 1000 (Limerick, Louth and Monaghan). That’s not quite as bad as the latest figures for London, but getting there.

By staying in and reducing the number of contacts now we can influence what happens in a few weeks, but we know the results of Christmas and New Year infections haven’t fully filtered through into cases numbers yet, let alone deaths. It’s like standing on a beach watching an enormous wave coming at you and knowing you can’t do anything to get out of the way.

R.I.P. Sir Arnold Wolfendale (1927-2020)

Posted in Biographical, The Universe and Stuff with tags , , , on January 4, 2021 by telescoper

I’ve just heard the sad news that former Astronomer Royal Sir Arnold Wolfendale passed away on December 21st 2020 at the age of 93. There’s a full tribute to him here from Durham University, where he spent most of his very distinguished career as a cosmic ray physicist and played such an important role in developing a worldwide centre of excellence in Astronomy.

I remember Arnold Wolfendale very well from many trips to Durham over the years, starting with the SERC School for new postgraduate students in Astronomy I attended in 1985. He was an avuncular and extremely friendly presence there who went to a lot of trouble to talk to studdents; you can see him in the front row of the now (in)famous group photograph taken there:

 

Rest in peace, Sir Arnold Wolfendale (1927-2020)

Funding ‘Blue Skies’ Research in Ireland

Posted in Maynooth, Politics, Science Politics with tags , , , on January 4, 2021 by telescoper

Before Christmas, Ireland’s new Department for Further and Higher Education, Research, Innovation and Science embarked on a consultation about its strategy for 2021-23. Like most other departments, the Department of Theoretical Physics at Maynooth made a collective submission to this consultation and we await further developments. This blog post is not that submission. What follows here is my own rant personal view and not that of my colleagues. And before you accuse me of some kind of sour grapes I’ll point out that the Department of Theoretical Physics is actually doing very well in securing grant funding despite the difficult environment.

It has been very clear to me since arriving in Ireland that funding for basic or fundamental research – especially in the sciences – is extremely poor. This is not a new thing, but the current situation is largely the result of a high-level report published in 2012. This identified 14 priority areas of research that are most likely to give demonstrable economic and societal return, and where Ireland should focus the majority of competitive funding. Four criteria were used in selecting the 14 priority areas for future, competitively-awarded investment for economic objectives:

  1. the area is associated with a large global market or markets in which Irish-based enterprises already compete or can realistically compete;
  2. publicly performed R&D in Ireland is required to exploit the area and will complement private sector research and innovation in Ireland;
  3. Ireland has built or is building (objectively measured) strengths in research disciplines relevant to the area; and,
  4. the area represents an appropriate approach to a recognized national challenge and/or a global challenge to which Ireland should respond.

The `vast majority’ of SFI’s funding is directed towards the 14 areas so defined, leaving virtually nothing for anything else, an outcome which has dire implications for `blue skies’ research.

I think this is a deeply misguided short-term policy, which will have a strongly negative effect on science in Ireland in the medium to long term, especially because Ireland spends so little of its GDP on research in the first place. On top of that it will mean that Ireland will miss out on a golden opportunity to capitalise on Brexit, by encouraging European scientists disaffected by the hostile environment that has been created in Britain by its government’s xenophobic policies to relocate to Ireland. There’s simply no point in trying to persuade world-leading researchers to come to Ireland if insufficient funds are available to enable them to establish here; the politicians’ welcoming platitudes will never be enough.

I hope the Irish government can be persuaded to reverse this situation by investing more in basic research.
In the meantime I thought I’d re-iterate the argument I made a while ago, in response to a funding crisis in the UK, about using taxpayer’s money to fund research in universities:

For what it’s worth I’ll repeat my own view that “commercially useful” research should not be funded by the taxpayer through research grants. If it’s going to pay off in the short term it should be funded by private investors, venture capitalists of some sort or perhaps through some form of National Investment Bank. When the public purse is so heavily constrained, it should only be asked to fund those things that can’t in practice be funded any other way. That means long-term, speculative, curiosity driven research.

This is pretty much the opposite of what Irish government thinks. It wants to concentrate public funds in projects that can demonstrate immediate commercial potential. Taxpayer’s money used in this way ends up in the pockets of entrepreneurs if the research succeeds and, if it doesn’t, the grant has not fulfilled its stated objectives and the funding has therefore, by its own standards, been wasted.

My proposal, therefore, is to phase out research grants for groups that want to concentrate on commercially motivated research and replace them with research loans. If the claims they make to secure the advance are justified, they should have no problem repaying the funds from the profits they make from patent income or other forms of exploitation. If not, then they will have to pay back the loan from their own funds (as well as being exposed as bullshit merchants). In the current economic situation the loans could be made at very low interest rates and still save a huge amount of the current research budget for higher education. I suggest these loans should be repayable in 3-5 years, so in the long term this scheme would be self-financing. I think a large fraction of research in the applied sciences and engineering should be funded in this way.

The money saved by replacing grants to commercially driven research groups with loans could be re-invested in those areas where public investment is really needed, such as purely curiosity-driven science. Here grants are needed because the motivation for the research is different. Much of it does, in fact, lead to commercial spin-offs, and when that happens it is a very good thing, but these are likely to appear only in the very long term. But just because this research does not have an immediate commercial benefit does not mean that it has no benefit. For one thing, it is subjects like Astronomy and Particle Physics that inspire young people to get interested in science in the first place. That such fields are apparently held in so low regard by the Government can only encourage Ireland’s brightest young minds to pursue careers abroad.

Last Day Off

Posted in Biographical, Covid-19, Education, Maynooth on January 3, 2021 by telescoper

Tomorrow is officially my first day back at work after the Christmas break. Not that I’ll be going back to my office on campus in the morning. Thanks to the state of the Covid-19 pandemic I will be working from home for the foreseeable future. It’s looking pretty grim at the moment, and I think it’s going to get a lot worse before it gets better:

 

I know I’m not alone in thinking that it was a big mistake to relax the Covid-19 restrictions so soon before Christmas with cases at such a high level. What has happened since then in terms of new cases and hospitalizations is even worse than the experts predicted; today almost 5000 cases were reported, taking the total past 100,000. I hope the current Government is properly held to account for the way it bowed to pressure from vested interests (especially the so-called “hospitality industry”) the way it did.

I haven’t read my work emails since the end of last term (December 18th 2020). I do hope I don’t have to work through a mountain of them when I finally open my inbox tomorrow morning. No doubt as  we get back to work there will be detailed instructions on what we can and can’t do. Semester Two of teaching in Maynooth doesn’t start until February 1st so we have a bit of time to see how things progress, but I honestly can’t see any prospect of a return to on-campus classes for the rest of the academic year. I do hope we’re not going to be required to make yet another set of elaborate plans that will never be put into practice…

At least this term I will be “working from home” in better conditions than previously, in my own house with a good internet connection and a proper study that I can close the door on when I need a break. I’ll be teaching three modules next Semester, including one (Advanced Electromagnetism) that I’ve never taught before. Teaching isn’t the only thing, but the other important matters to be dealt with this month are not things I can really write anything about at this stage.

The January examination period starts on Friday (8th) and ends two weeks later (Friday 22nd) so getting through that and getting the examinations marked is going to be the first priority. As in May all these examinations will be in the form of online assessments. We have done this sort of examination before, which makes it a bit easier than last year, but they still cause a lot of stress for staff and students alike. I will have about 100 scripts to mark and will have to do all of them on screen. I’m not looking forward to that at all, but it has to be done. In between those we will be running our first Astrophysics & Cosmology Master Class, which I am looking forward to enormously. It seems to have generated a lot of interest, but we won’t know precisely how many will tune in until the day arrives. It might be a lot if the Schools are closed, which they may be.

I was tempted at this point to make a list of all the things I have to do tomorrow, but that would be breaking my resolution to take a complete break so I will leave that until the morning and instead go and have a nap.

The Day of Perihelion

Posted in The Universe and Stuff with tags , , , , , , , , on January 2, 2021 by telescoper

Earth’s elliptical orbit viewed at an angle (which makes it look more eccentric than it is – in reality is very nearly circular).

Today (Saturday 2nd January 2021) at approximately 13:50 GMT the Earth reaches at the point on its orbit, which which it is at its closest to the Sun, i.e. at its perihelion. At this time the distance from the Sun’s centre to Earth’s centre will be 147,093,163 km. This year, aphelion (the furthest distance from the Sun) is at 23.57 GMT on July 5th 2021 at which point the centre of the Earth will be 152,100,527 km from the centre of the Sun. You can find a list of times and dates of perihelion and aphelion for future years here.

At perihelion the speed of the Earth in its orbit around the Sun is greater than at aphelion (about 30.287 km/s versus 29.291 km/s). This difference, caused by the Earth’s orbital eccentricity, contributes to the difference between mean time and solar time I blogged about when discussing the Winter Solstice a couple of weeks ago.

It surprises me how many people think that the existence of the seasons has something to do with the variation of the Earth’s distance from the Sun as it moves in its orbit. The fact that perihelion occurs in the depth of winter should convince anyone living in the Northern hemisphere that this just can’t be the case, as should the fact that it’s summer in the Southern hemisphere while it is winter in the North.

The real reason for the existence of seasons is the tilt of the Earth’s axis of rotation. I used to do a little demonstration with a torch (flashlight to American readers) to illustrate this when I taught first-year astrophysics. If you shine a torch horizontally at a piece of card it will illuminate a patch of the card. Keep the torch at the same distance but tilt the card and you will see the illuminated patch increase in size. The torch is radiating the same amount of energy but in the second case that energy is spread over a larger area than in the first. This means that the energy per unit area incident on the card is decreases when the card is tilted. It is that which is responsible for winter being colder than summer. In the summer the sun is higher in the sky (on average) than in winter. From this argument you can infer that the winter solstice not the perihelion, is the relevant astronomical indicator of winter.

That is not to say that the shape of the Earth’s orbit has no effect on temperatures. It may, for example, contribute to the summer in the Southern hemisphere being hotter than in the North, although it is not the only effect. The Earth’s surface possesses a significant North-South asymmetry: there is a much larger fraction of ocean in the Southern hemisphere, for example, which could be responsible for moderating any differences in temperature due to insolation. The climate is a non-linear system that involves circulating air and ocean currents that respond in complicated ways and on different timescales not just to insolation but to many other parameters, including atmospheric composition (especially the amount of water vapour).

The dates when Earth reaches the extreme points on its orbit (apsides) are not fixed because of the variations in its orbital eccentricity so, in the short-term, the dates can vary up to 2 days from one year to another. The perihelion distance varies slightly from year to year too.

There is however a long-term trend for perihelion to occur later in the year. For example, in 1246, the December Solstice (Winter Solstice for the Northern Hemisphere) was on the same day as the Earth’s perihelion. Since then, the perihelion and aphelion dates have drifted by an average of one day every 58 years and this trend will continue. This means that by the year 6430 the timing of the perihelion and the March Equinox will coincide, although I will probably have retired by then…