At JPL the other day, I stood next to this gentleman as he prepared to take over the controls of the Curiosity craft (now on the surface of Mars, you might recall) for a bit of driving. I don’t know where it was being taken to or from on that jaunt, Click to continue reading this post
A creative team at IBM made a rather elaborate little stop motion film recently*. “Little” is a key word here. The moveable elements are atoms (well, actually CO molecules), moved with a scanning tunnelling microscope! They are calling the project “Atomic Shorts”, it seems. (Pause…) Yep, on reflection, I think I will stay away from all the obvious juvenile jokes that spring to my mind…
See the film here:
There’s a “making of” film (of course), which you can find below, along with some Click to continue reading this post
On Saturday I decided to have a bit of simple relaxation at home, and sit on the patio with my notepad and some pencils and draw a likeness. I’d not done any practice from images for a while, and frankly my pencil work was very rusty and needed a workout.
So I dug out this month’s issue of a sewing magazine that I subscribe to (what?! well, it’s a long story… let’s move on) that happens to sometimes have interestingly lit and well reproduced photos of faces and sketched for a while.
It was fun (even with the slightly flawed outcome). (Click for a larger view.)
-cvj
Yeah. Scary, right? I woke up one morning to this result (see earlier posts here, here, and here) from a night of an intensive computer run. It was not meant to be a straight line, but pretty close to it, so I knew that something was wrong with my code. Took me a good long while to trace the problem, but I did in the end. My signal was being swamped by both Click to continue reading this post
It has been a while since I shared a snippet of the book project with you, so here’s an update:
Yesterday I completed a short burst of activity in which I re-did two pages in a story that were just horrible to behold. This is a panel from one of the pages. I’m pleased Click to continue reading this post
Steinn has a nice post about the sudden ending of the Kepler mission, due to a crucial component failure. As he notes:
“Kepler has discovered almost 3,000 planetary candidates, of which about 100 have been confirmed through a variety of techniques, and, statistically, most of the rest are likely to be real planets.
Kepler has not quite found earth like planets in the habitable zone, yet.
It is heartbreakingly close to doing so.”
Sad to see, especially at a time when science is being hurt so badly by continued Click to continue reading this post
Well, I’ve got to say goodbye to another excellent group of students from my undergraduate electromagnetism class. We had the final today (starting at 8:00am – ack!), and given the lack of rioting, tears, and throwing of rotten fruit during the exam itself, I assume that it was not too bad an exam to sit. Of course, the real measure of what they thought will be how they did in the actual answering of questions, and I’ve not looked to see how that has turned out yet.
Again, I feel a bit sad since it was a good group of students and it was fun to teach them this material. While it is certainly good to move on to other things (I’ve too many projects I want to work on, as usual), I will miss the twice weekly classes with them. Highlights this year include (in no particular order):
(1) The thing I love to do when we are studying dipole radiation – taking the class outside (surprising them somewhat) to look up at the blue sky and connect why it is blue to the computation we just did, including understanding the pattern of the blueness Click to continue reading this post
Here’s a rose for Mother’s Day (in the USA). It is from my garden, and I took the photo last week to make a card to send to my Mother and my Sister.
Happy Mother’s Day to all everywhere!
-cvj
(Look under “flowers” category for roses from past Mother’s Days.)
The many squash plants in the garden this season all started a rather cluttered rush of fruiting. Some of them stalled in their growth, and overall it seemed a good idea to remove these small ones and some others, generally thinning the plants a bit to allow them to focus their energy resources into fewer squashes. A bonus of this procedure… an early Summer squash banquet!
Earlier this week I made a very tasty bean stew with some beans harvested from last Click to continue reading this post
So I’ve moved on to curved lines now, in case you’re wondering. 🙂 (See previous posts.) The last several days (the research parts) have been taken up with more computations. A lot of the time has been spent calibrating the programs, and trying to assess and understand and characterize the inevitable errors that show up, by running the programs and checking the resulting plots of data points against expectations shaped by hand calculations. Calculating on the train to and from work, I’ve filled several pages of my small notebook with computations, alongside sketches of some of my surroundings as usual (people mostly). As a result (fingers crossed) I think I’ve now understood all the key aspects of the results I’ve been getting, and have good numerical control of things. To get such control, I’ve had to push the error tolerance and the size of the grid of points I’m computing on to regimes where I’m back again to waiting for the better part of an hour for each data point. (One sets up the problem on the computer by making continuous variables, such as space and time, into discrete ones, forming a grid. The problem is then to use various Click to continue reading this post
How is the line coming along? It is very kind of you to ask (if indeed you were). Well, there it is to the left. (See the previous post for background.) In the end, I abandoned Maple since it was taking way too long to do each point, and just for the simple example. (When I tried to do one sample point of the complicated example it took 24 hours and I stopped it before it was done!) The point is that Maple does not easily Click to continue reading this post
I’ve been multitasking in an interesting way. Sort of. I’ve reached a certain point with some computations I am doing that I cannot go beyond by analytic means. 
This means that I can’t extract the physics I need by doing algebra and other exact manipulations on paper any more. Progress can continue however by using numerical means, employing a computer to solve the highly non-linear equations and extract the juice. There are several steps involved, and ultimately, I want to determine how a certain physical quantity depends on another physical quantity. (I’m sparing you the trouble of knowing what the details of the physical quantities are, since it does not matter for the thing I am trying to tell you. It relates to quantum field theory, gravity, and string theory, which connects the two.)
I can see that dependence quite clearly if I simply plot a graph of one versus the other, and in this case I need the computer to work out what the points on that graph are. I actually don’t know the answer for the cases I really am interested in, nobody does (that’s why it is research!), and so that’s what I want to find. I want lots of points to get a nice smooth graph, so the computer has to compute a lot of points, and I need to run it for a long time since I want it to compute the points very accurately. So I wrote a program (in Maple) to work on the problem, studying just one Click to continue reading this post
Because Winter is coming… (?)
-cvj
Here’s a timelapse video of the CicLAVia ride from Sunday 21st April. (I’ve done one for each of the past rides as well, so search on “ciclavia” for them if you wish.) My thoughts about the ride were posted back on the day, and there’s lots of discussion at that post on some of the issues I raised, so go and have a look if you like, and feel free to join in. I did the ride on the Brompton, as usual, and this time I was accompanied by my colleague Krzysztof Pilch, who was riding one as well. We even saw a few others on the way, which was nice.
The video is a bit flawed, not the least because at some point the top of my bag started puffing up a bit and blocking part of the view. Also, I’ve not laid on some funky music like the fancy folk do, so it is quite silent. But there it is as a record of most of the 13-15 mile route from Downtown to Venice beach:
Click to continue reading this post
You might recall that last year I gave a talk at TED Youth, in their second year of short TED talks aimed at 
younger audiences. You’ll recall (see e.g. here and here) I made a special set of slides for it, composed from hundreds of my drawings to make it all in graphic novel style, and somehow trying to do (in 7 minutes!!) what the TED people wanted. They wanted an explanation of string theory, but when I learned that 
I was the only person in the event talking about physics, I kind of insisted that (in a year when we’d discovered the Higgs boson especially!) I talk more broadly about the broader quest to understand what the world is made of, leaving a brief mention of string 
theory at the end as one of the possible next steps being worked on. Well, they’ve now edited it all together and made it into one of the lessons on the TED Ed site, and so you can look at it. Show it to friends, young and old, and remember that it is ok if you don’t get everything that is said… it is meant to invite you to find out more on your own. Also, as you see fit, use the pause button, scroll back, etc… to get the most out of the narrative.
I’m reasonably pleased with the outcome, except for one thing. WHY am I rocking Click to continue reading this post
