Abacus Cadabacus! – Flash Anzan

sorobanI was quite stunned by this. For the first part, it is great (and charmingly bizarre) that there is a craze based around the abacus that has such a following (abacus or “soroban” championships), and for the second part… it is nothing short of remarkable when they get to the stage where they go “beyond the abacus”, and are just doing it in the head, but using abacus moves. And so fast!!! The radio program “Land of the Rising Sums” by Alex Bellos that I learned this from is here. There’s also a Guardian article here. It is all mostly about how numbers and arithmetic are taught in Japan. I think it is great that (from the people they interviewed) there’s a sheer love of calculation and of numbers and that there’s none of the lamentable “I’m not good at this I’m a languages/sports/art person” attitude that is so common in our society and which is responsible for poisoning children’s education so early on. I also love that the abacus is so fundamentally old-fashioned – […] Click to continue reading this post

Sunday Preparations…

This is the last day before the new semester starts here at USC. I’ve been wandering around the house a bit slowly. One reason is probably the excellent dinner party last night, which involved a lot of cooking for a lot of Saturday. That went well, and people seemed to enjoy themselves a lot. Good reason for a slow day the day after. The other reason is that it is simply nice to enjoy the calm before the storm of the new semester begins in earnest… So slow wandering around the house doing various simple tasks seems about right.

sunday_bread_1At some point I decided to start looking for my materials for tomorrow’s class. I teach graduate level electromagnetism again this semester (part two of a two part course) and so it is a good time to start looking into old folders and so forth, trying to see what I’ll re-use, what I’ll re-do, and so forth. It seems that last Fall was the first time I did a complete scan of all my hand-written notes into pdfs to allow me to deliver them from my iPad, and so that’s good news right there. I can annotate right on top of those and add new pages if I want to… but it is nice to start with a base of good material to hand right at the starting gate.

While I’ve been looking through materials I’ve also been making bread. I’ll need some for the week, what with sandwiches and all that, and it is a also a pleasantly slow and endlessly rewarding thing to do. I decided to make a more moist final dough than I have in recent times. I think that this will give both a nicer crust and crumb. That blob in the bowl in the picture above left is the result of a very successful first rise. Most of bread making is waiting, and so it is perfect for when you are doing slightly mundane but time-consuming tasks like looking at old files of course notes.

sunday_bread_2I rolled everything out into 12 rolls and a good slicing sandwich loaf and put them to rise again and went back to tinkering with files (analogue and digital). The picture to the right shows the result of that second rise. The oven is being preheated and they are nearly ready to go in. Already the smell is great, even though right now it is just a yeasty-doughy smell.

I’ve been wondering whether to jump ship and abandon Jackson as the main text for the class (shock! horror! – Jackson is a staple of so many graduate courses in physics) and go with something new. There have been two texts of note (that I know of) in the last couple of years that have risen to challenge Jackson’s supremacy, the one by Anupam Garg (“Classical Electromagnetism in a Nutshell”, Princeton), and the one by Andrew Zangwill (“Modern Electrodynamics”, Cambridge). My feeling is that both these books (I’ve looked at Garg more than Zangwill [update: see later remarks]) do a good job of making the subject seem alive and modern. Jackson has a great deal of useful material, presented in a firmly sensible way that is hard to argue with, and it will always remain a classic, but sometimes I think it suffers a bit from feeling somewhat old. I like that, for example, there’s a nice treatment of the beam of a laser in Garg as an […] Click to continue reading this post

Phase Diagram

phase_diagramFor those who have a thirst for something physics-y to follow the tomato chutney post, here’s a decorated physics diagram I made in Matlab this morning. Click for a larger view. It’s the phase diagram of interesting black hole transitions* (that I co-discovered 14 years ago) associated with part of the story I mentioned last month. On the right of the line you have small black holes favoured (of a given charge, so move horizontally), and on the left side of the line the system favours large black holes and so when you cross the line you have a sudden jump from one type to the other. That second order critical point I talked about there is the end of the line of first order points. The blue dot. Above there, you cross over smoothly from small to large holes. The blue dot is the border between the two cases.

It is a bit like having steam (or water vapour) on the left and liquid water on the right, and crossing the line is what you call boiling. The second order point is the place […] Click to continue reading this post

When Life Hands You Tomatoes…

… make chutney!

tomato_surplus_1

So the garden has been yielding a great deal in the tomato department, as you saw from earlier posts. There’s been quite the fig surplus too, but more on that later. Last night – late last night – I decided to work on another food item that allows me to use them up and save this glorious condensation of Summer for a later time. I decided to make a tomato chutney. Well, I’m making two. I wanted to take the yellower tomatoes to make one with a lighter colour and flavour, and I will (later tonight perhaps?) make another, darker one with red tomatoes (with a little pepper from the garden for warmth).

A chutney is simple. It’s a bit like a savoury jam but even easier. I halved the little yellow pear variety tomatoes, and chopped a yellow onion – about half as much in volume as I had tomato. (Some extra tomatoes showed up late – I found a few green […] Click to continue reading this post

Steamin’

CPU_usageYeah! It feels great when I get the workhorse computer really chugging along. 85% is unusual to see on a normal run, since this beast (a 2010 3.32 Ghz Mac pro quad core) has a lot of computational capacity that you don’t need for most tasks. I’m getting up to 85% because all four cores are crunching away independently on the same problem (written in MatLab) but different parts of it. Each point on the resulting graph will be the result of having computed 2000 points. Each of those 2000 points comes from computing a boundary value problem discretized into a million points. See an earlier post for more about that.

(Update: Now running even more tasks associated with this problem: Up to 96% now:
CPU_usage_2
…with nothing idle at all. This is probably not as efficient any more, but it is for a few hours and then back to 85%. In the meantime, it is amusing how it makes me feel I’m doing more work somehow…)

I assigned different parts of the graph to different processes by hand, not using a […] Click to continue reading this post

Tales from the Industry XXXX – Comedy Moments and More

crystal_D_and_cvjWhat happened here? Who is that, and what exactly made her so annoyed? Read on!

There are a number of new things coming out on screens near you (or may have already aired) that might interest you. For fans of the History Channel’s The Universe (thanks so much for all the emails with kind remarks, and so forth, by the way) there’s a new show in the works that’ll mix science and history (and other disciplines) in an interesting way. I’ve no idea when it is set to air though, and frankly I’m very confused as to what is on History and what is on H2, the companion channel, so I’ll just say watch out for that. We shot a lot of material for that earlier this year, and I hope you enjoy the show overall, despite my mumbling mug appearing on your screen a bit!

Apparently the many of the Weather Channel’s science-y segments were shown, in a series called “Deadly Space Weather”, which imagines what would happen on earth if you brought various prevailing conditions on other planets back here. Yeah, I know… but actually it’s a good opportunity to think about science ideas, at least in principle. You’ll recall that I did some demos for that which were rather fun – and hopefully interesting too. I saw a piece of one of them online (10:44 or so), and got rather annoyed at one point. There’s a segment where I demonstrate – with real sulphuric acid – the effect it has on organic compounds, using sugar. It is quite spectacular. And of course quite dangerous, so I’m actually wearing a lab coat (yes, there are occasions where real […] Click to continue reading this post

Franklin Vs Watson and Crick

Wow! This is exactly the kind of thing I’ve been hoping to see more of! When the report on this started on NPR about having students do music and video about science topics, I groaned a bit (while making breakfast) when I heard the Watson and Crick mentions in the clip in the background, saying to myself that it is so unfair that once again, Rosalind Franklin is being forgotten and a whole bunch of kids will miss the opportunity to learn about the nuances involved in doing science, and miss that she did such crucial work on this most important discovery…. I continued making my coffee, listening to the report with half an ear…. and then! …more of the clip was played and a girl’s voice came on, singing a bit about Rosalind Franklin, and then I realized that this was exactly the story they were telling in the video*. The whole NPR report, by Adam Cole, is here, with a short video doc. It is about not just the Rap B.A.T.T.L.E.S. doing songs and videos about various science topics, but also about other programs as well, started by people such as Christopher Emdin at Columbia, and others. Excellent.

I’ve embedded the Franklin/Watson/Crick video below. It was made by students in the Bay area, guided by Tom McFadden at Stanford. I think this is great piece of work since they did a great job on production, particularly with casting and costuming everyone to play the principals, cutting in reaction shots and so forth… It’s a real film! And for a change, for a popular rap about science that a wide variety of young people might be attracted to, this time the music is actual contemporary rap (which usually means well thought out lyrics combined with rhythmic devices that are definitely post 1980s, and not just a bunch of lines recited over a corny background beat – see another excellent example at the end of this post) which is great! An amusing and poignant extract:
[…] Click to continue reading this post

Drawing Your Nobel Prize

Another fun combination of science and sketching! Photographer Volker Steger decided get his subjects – a selection of Nobel Prize winners – to try to represent their work (what they got the prize for) with a drawing. You can see a discussion of the results (and find links to the prizewinners talking about their work) here*

-cvj
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