Archive for March, 2011

Happy birthday, Robert Bunsen!

Thursday, March 31st, 2011

If you’ve visited Google today, you might have noticed that their logo looks a little strange.

That’s because it’s the 200th birthday of Robert Bunsen

Born in Gottingen, Germany, on March 31 1811, Robert Wilhelm Eberhard Bunsen was a prominent chemist in his day who discovered the elements caesium and rubidium and developed the Bunsen cell battery.

But he is best remembered for the distinctive gas burner he developed with his laboratory assistant Peter Desaga in 1854 and 1855 to study the colour spectrum of different heated elements.

…. the man behind the Bunsen burner!

Xournal: Want to number pages in a journal file?

Thursday, March 31st, 2011

Want to number pages in your Xournal journal files?  If you’re using Xournal on a typical Linux distribution, you can try these Python scripts, which add or remove page numbers from the journal file itself.

They’re somewhat crude, so use them at your own risk.  They create a new file rather than overwriting the old one, so the risk in using these should be minimal.

They have gotten the job done for me for at least a  year now.

xoj_numbering_scripts.tar

Any problems or suggested improvements?  Let me know!

On the Kindle

Wednesday, March 9th, 2011

I’ve had a Kindle for about 6 months now.  It’s a nice device, but it’s quite annoying that I can have new hardcover books shipped to me for 2/3 of the price of the Kindle edition.  Why should the Kindle book – which costs nothing to print, and nearly nothing to store and ship – cost 33% more than a full-size hardcover book?  (This ignores the much lower cost of the paperback – which is the edition most comparable to a Kindle edition, anyhow.)

Were the Kindle books a little more price competitive, I’d have probably bought about five times as many Kindle books as I have now.

Student sorting

Wednesday, March 9th, 2011

Each semester, I have at least eight hours a week of “office hours”; time when students can come by for assistance with chemistry.  Of the students wh0 drop in for office hours, it’s surprisingly easy to tell students who are likely to pass their courses from students who are likely to fail them.

The students who are likely to pass courses come by with questions related to things we’ve been doing in class.  If they did poorly on an assignment, they bring the assignment in with them and ask specific questions about things they weren’t clear on.  They bring in attempts to work the practice problems provided in their study guides.  In short, they come in to see me to talk about chemistry, since I’ve got experience in helping people learn chemistry.

The students who are likely to fail courses show up at my office door, too.  But they’re at my office for a different reason.  They want to discuss, in abstract terms, why they did not do well on their tests.  Grades come up a lot; these students want to know to the exact point what they need to make on their next test.  But chemistry itself never seems to come up, unless I specifically mention it.

The key difference is that students who will likely succeed come by to discuss things related to the topic of the course.  Students who will likely fail come by to discuss everything except the topic of the course.  Food for thought.