Archive for the Uncategorized Category

Sathya’s Cosmic Sirens

Posted in The Universe and Stuff, Uncategorized with tags , , , on January 7, 2013 by telescoper

Bit busy today so I thought I’d just post this talk by Cardiff’s own Prof. Bangalore Sathyaprakash at last year’s TEDX event in Cardiff.
The title is Cosmic Sirens although given that the topic is gravitational waves I hope that “sirens” isn’t intended to mean those entirely mythical entities that lure unsuspecting PhD students to their ultimate destruction…

Anyway, here’s the blurb:

In 1916 Einstein predicted that dynamical mass distribution generates ripples in the very fabric of spacetime that propagates outwards at the speed of light.

For over two decades B.S. Sathyaprakash (Sathya for his family and friends) is engaged in research to detect these ripples called gravitational waves, from cataclysmic cosmic events such as exploding stars, colliding black holes and the big bang. His personal goal is to observe and understand black holes and gravity using gravitational radiation. He is the head of the gravitational physics group at Cardiff University — a centre for modelling astronomical sources of gravitational radiation, discovering innovative algorithms to search for this radiation and analyzing data from gravitational-wave detectors using massive computer clusters.

Although there is firm indirect evidence that certain astronomical systems do emit gravitational waves, so far no one has detected them directly. Sathya and his team are part of a worldwide effort, called the LIGO Scientific Collaboration, to detect these elusive waves using kilometer long laser interferometers in the US, Europe and Japan. Recently, Sathya helped develop the science case for building such a detector in India. He has been involved in the European design study of a third generation underground detector with a 30 km baseline called the Einstein Telescope, chairing the group that developed the science case for this ambitious venture.

And here is the actual talk..

Blog Feedback Questionnaire

Posted in Uncategorized on January 4, 2013 by telescoper

I’m back to work with a thump, having received delivery of my module feedback questionnaires for last term. All useful feedback, so I’m grateful for the students who bothered to fill them in and especially to those who wrote detailed textual comments. Apart from one, that is, who was apparently so gripped by apoplexy that he/she was unable to hold the pen properly – the resulting scratchings were entirely illegible.

Anyway, in the light of the students’ response to the quality of my lecturing I thought I’d try to gather feedback on the quality of my blogging. Please complete the following survey. Textual comments may be provided in the form of textual comments through the textual comment box below.

2012 in review

Posted in Uncategorized on December 31, 2012 by telescoper

The WordPress.com stats helper monkeys prepared a 2012 annual report for this blog.

Here’s an excerpt:

About 55,000 tourists visit Liechtenstein every year. This blog was viewed about 460,000 times in 2012. If it were Liechtenstein, it would take about 8 years for that many people to see it. Your blog had more visits than a small country in Europe!

Click here to see the complete report.

Nadolig Llawen i chi gyd

Posted in Uncategorized with tags , on December 25, 2012 by telescoper

Having spent most of the afternoon setting up a new laptop and  wireless router, and installing various bits of software on the computers here at the old family home, I thought the least I could do is sign in for a moment and wish you all a very Merry Xmas while we prepare for dinner.

If your Christmas Day has been half as good as mine, then mine has been twice as good as yours!

Kettles, pots and metonymic shifts….

Posted in Uncategorized on December 17, 2012 by telescoper

As our Departmental Christmas lunch is looming I only have time for a brief reblog of this nice discussion of boiling water in pots. It might strike you as as a bit obsessive to write about the physics of such an everyday phenomenon, but I think a bit of an obsession about physics is a very good thing indeed.

P.S. As a fully paid-up member of Pedants Anonymous I couldn’t resist drawing attention to the metonymic shift involved in the title “Watching pots boil”. Of course the pot doesn’t boil – the water in it does….

Michael de Podesta's avatarProtons for Breakfast

My previous article about kettles left me wondering: Can gas hobs really waste more than half of the calorific energy in the gas? I decided to try a few more experiments and finally I think I have an answer: ‘Yes’. Gas hobs really do fail to transfer a great deal of the calorific energy in the gas to the pan or kettle they are heating.

Experiment#1 Rather than measuring the total time to reach 100 °C, I measured the rate of temperature rise. Because the heat capacity of water is well known, this allowed me to estimate how much thermal power was entering the water. So I spent a happy hour or so heating up various amounts of water: first 200g, then 400 g, 600g and finally 800g and I measured the temperature every 20 seconds.

I knew the burner power was 1.75 kW, and after a little jiggery pokery with a…

View original post 639 more words

God sent the shooter….

Posted in Uncategorized with tags on December 16, 2012 by telescoper

Sometimes I just despair. Watch this and weep. If this is your God, I weep for you too.

Interlude

Posted in Uncategorized on December 8, 2012 by telescoper

Well, dear readers, I have to go away for a week or so, and the place I’m going doesn’t offer internet access, so I’m going to have to suspend blogging activities until I return. Normal service will be resumed as soon as possible, but in the meantime here’s one of those old BBC Interlude films to keep you entertained…

To Hype or Not to Hype?

Posted in Uncategorized with tags , , , on November 18, 2012 by telescoper

Like many bloggers on this site, I have set up my WordPress account to send a tweet every time I publish a new post. I did have it set up to post to Facebook too, but that mechanism seems no longer to work so I usually post my offerings there by hand. I joined Google+ some time ago, and did likewise, but found it to be a complete waste of time so haven’t logged on for months. Sometimes if a topic comes up that I’ve covered in an old post, I’ll tweet it again, but that’s the extent to which I “pimp” my blog.

However, I have noticed that over the last few months my Twitter feed is increasingly clogged up with multiple copies of blog advertisements from people I follow, often with requests like “Please Retweet”.  I have to say I don’t like this at all. It seems very tacky to me to be constantly screaming for attention in this manner. If people want to retweet or link to my posts then I’m very chuffed, of course, but I don’t think I’d feel the same way if I touted for traffic. Anyone who blogs already runs the risk of being labelled an attention-seeker. That doesn’t bother me, as in my case it’s probably true. But there are limits…

These thoughts came into my head when I stumbled across a couple of posts about self-promotion (here  and here). The author of the first item says:

Whenever I write a blogpost, the extent of my self-promotion is this: tweet my blog-link about 3 or 4 times in the same day it’s published…

I think even that is excessive. I’m very unlikely to read a blog post that’s been rammed down my neck on Twitter four times in a single day, very unlikely to retweet said link,  and indeed very unlikely to read anything further from an author who indulges in such a practice. Call me old-fashioned, but I struggle to keep up with Twitter anyway and I only follow about 100 people. I can do without this unseemly conduct. It’s nearly as bad as the “promoted tweets” (i.e. SPAM) that also plague the Twittersphere. More importantly, people don’t seem to realise that there is such a thing as too much publicity.

The answer is simple. Write interesting stuff, put it out there and people will be interested in it. It’s the same with scientific papers, actually. Write good papers and people will find them and cite them. Simples.

I realise my attitude in this regard is quite unusual and shaped by my own experiences and circumstances. I don’t make any money from this blog – it’s really more of a hobby than anything else – and I don’t particular care how many people read the items I post. If I did I wouldn’t put up things about Jazz or Poetry or Opera, as these have very little popular appeal. I just enjoy writing about such things, and sharing things I come across. I’m not denying that I like it when posts prove popular and/or provoke discussion, of course. But I don’t get upset when others sink without trace, as many do.

Moreover, having more blog hits isn’t going to advance my career one jot. Possibly quite the opposite, actually. I know there are plenty of important and influential people out there who think having a blog is some sort of aberration and in order to keep it going I must be neglecting my duties as an academic (which, incidentally, I don’t), so if anything it probably has a negative overall effect.

I realise that, as an amateur blogger, my attitudes are probably very different from the majority of those who actually earn money from this activity. The Guardian science bloggers, for example, get paid according to the number of page hits they generate. Unfortunately the result is that the Guardian itself repeatedly tweets links to every new post, as does every individual author. The resulting deluge of tedious advertising no doubt generates traffic that helps increase revenue, but its effect on me is that I no longer read any of the posts there.

There. I’ve said it. No doubt there’ll be angry reactions from fellow bloggers. If this post has offended anyone then I’m sorry, but  please remember to retweet it, share on Facebook, Google+, etc.

Lest we forget

Posted in Uncategorized with tags , , , on November 11, 2012 by telescoper


It’s Remembrance Sunday which happens this year to fall exactly on Remembrance Day, so I scheduled this in advance to be posted on the eleventh hour as seems appropriate. I’ll be observing two minutes’ silence as this goes online, on my own as I prefer to do it on such occasions. I’ve written long posts about my feelings about Remembrance Day (see the tag Poppy for examples), so I won’t repeat myself here.

I will however take the liberty of posting this video about shell shock and other reactive disorders, as a reminder that the Poppy Appeal is not just about remembering the fallen, but also about helping the survivors who have been maimed or traumatised by war. It’s not an easy clip to watch, but then it’s not supposed to be. Click through to the other segments if you can stand it.

I’ll also add that many victims of shell shock were shot as cowards, including three seventeen year-old British soldiers who had lied about their age in order to enlist. Nowadays this is recognised as a form of post-traumatic stress disorder and although it can be treated, there is no complete cure.

Some people say that Remembrance Day glorifies war. I don’t see it that way at all. It’s there as a reminder of  the horrors of  past wars to urge us avoid armed conflict in the future. It’s a pity our politicians seem not to understand this.

Lest we forget.

And death is now my neighbour

Posted in Uncategorized with tags , , , , on October 20, 2012 by telescoper

I find myself in a very strange mood this morning after the horrendous events that unfolded in Cardiff late yesterday afternoon during the Friday rush hour. I didn’t know anything about them at the time, and even several hours later the picture was extremely confused. Stories were flying around that many people had been killed by a man in a white van who had been driving around deliberately running over pedestrians in Ely, which is to the west of Cardiff city centre.

This morning a slightly clearer picture has emerged. One person was killed but fourteen were injured, some of them critically. Five children are among those injured, the youngest just 23 months old. The University Hospital at Cardiff has this morning appealed for emergency blood donations as supplies are running short.  Grim.

The driver of the white van has been taken into custody on suspicion of murder, but his motives remain (for now) a mystery. It seems he went berserk after an incident at or near the Asda supermarket in Leckwith and went on the rampage, deliberately trying to run over pedestrians (including women and children) until stopped.

Here is a map of the area:

If you look at the top right-hand corner of the map you can see the cricket ground at Sophia Gardens; my house is to the North-West of that, near the slight kink in the main road (Cathedral Road) that runs by the stadium.  The Cardiff City football ground can be seen near the caption marked “Sloper Road”. That’s about 20 minutes’ walk from where I live.

I was several miles away at the time, so was never in any danger, but even from a such a distance it’s very disturbing when familiar “safe” places become sites of violence and destruction. Most of the time life seems so secure, but things like this show how fragile it can be. I can’t even begin to imagine what people must be feeling who experienced those events first hand.

It’s been a lovely sunny morning this morning, but there’s a palpable sense of shock around the neighbourhood. I think it’s the incomprehensibility more than anything. Why would someone do such things? What on Earth was going through his mind? Perhaps the Police investigation will provide answers. In the meantime  all I can do is post my sincerest condolences to the loved ones of the person who was killed, and wish a speedy and complete recovery for all those injured or traumatised by what they saw.