On December 27, 2014 during the night quite a nasty snow cover started to come down on a warm earth. At some point the snow stayed, but it stayed wet and icy. This managed to cover part of our solar panels in a thick layer of snow and ice. Since the cover was incomplete, the inverter refused to start and gave repeated errors. We ended the day with 0 Wh of power, a first for our installation. During the night, pieces of ice and snow kept coming down, giving rise to scary cracks and crashes on the roof.

December 28 I went to the roof around 13:00 to clean the last bits off with a broom: this was a dangerous operation from below: patches of ice and snow up to 50 kg crashed down on grass and driveway. The result of this action is quite apparent in the graph of solar power on that day!

Unstable operationsIncomplete snow cover

Via twitter, I saw a very cynical remark about asking questions after a scientific lecture with a flow diagram discouraging most people to ask anything at all. This does not at all correspond to my experience organizing symposia and conferences. Most of the time, questions are very welcome, and people are way too shy to share their visions. I therefore made a rebuttal in the form of the following flow diagram which I think is a better representation of the line of thought to follow.

New hall

Over the course of the last 4 years, Rotterdam Central Station has been completely renovated. Many times I have taken pictures (with my phone's camera, sorry), focusing on the area around track 1-3 where the action started and ended. For a documentation on four years of change, look at the pictures in my smugmug account.

PythonA few weeks ago I visited two reptile zoos together with Maxim: one in Breda and one in Tilburg. Click on the picture to see a sampling of a few pictures I took that day. I've been experimenting with some hand-held HDR pictures (three exposures each) at high ISO. All pictures have been post-processed through DXO Optics Pro 9, the HDR images have been aligned using Hugin and mapped using Luminance HDR.

Have you ever been wondering how to use the five stars in your photo catalog? I’ve heard people say: there are only two kinds of pictures: pictures you could show to someone, and pictures you wouldn’t show to anyone. Isn’t choosing between zero and one star enough?

Today I finally got around to use Automator, and make one of the command line scripts I have been running for ages a little easier to use.

The problem I have been trying to solve is the fact that the PDF files that a Mac creates are normally of very high quality and hence large. If you just want to send someone a document for reading on screen, a much smaller PDF file would do. The open source package “ghostscript” has a tool called ps2pdf that can be (ab)used to adjust the size of components for PDF files. I installed this in /opt/local/bin using the “macports” software.

I was reading some news when I noticed a mathematical curiosity. The article on a physics result mentioned a chance of “one in ten to the minus 7”. Of course this is a mistake: a small chance is either one in ten to the 7” or “ten to the minus 7”. The combination of “one in” and “minus” is nonsense. Interesting enough, this mistake is really common….

#math #oops

My native language is Dutch. My wife’s is French. We both speak each other’s language fluently. But we originally met each other in Germany, and have always been speaking English together.

If books mention “breaking silence” less frequently, does that mean that we have more silence now because it is no longer broken?

Finally some nice weather, delivering >3kW of PV power to the net right now.

#solar #energy