Forgot your password?

typodupeerror

Comment: Teach chemistry with a whiteboard (Score 5, Interesting) 372

by PeterKraus (#42863001) Attached to: Professors Rejecting Classroom Technology

Well, I have to say, from personal experience, the best received lecturers in my undergrad course have been those, who used pen + paper and an overhead projector. The speed of writing was just right, and it also helped to understand the (organic) chemistry quite a bit. Hello, Dr. Sutherland.

I do appreciate that other parts of chemistry - mainly physical and inorganic, and even more advanced organic chemistry - are bit more difficult to draw on the spot, but some of the slides our lecturers have published are absolutely inexcusable.

In any case, I believe the lecture material should be available online at some point - and by that I mean all of it. This bullshit of "I will print ultra boring slides with 50 slides per lecture, with gaps, so you pay attention" was, frankly, not helping. Also, I believe all lectures should be recorded and posted online - maybe after the whole course is over - too. Size is not an issue, and the students are already paying for that content, and it doesn't cost the lecturers anything extra, once set up properly.

But interactive electronic classroom jazz in university-level chemistry is either good for the computational chemistry lab, or a waste of time.

Comment: Re:Dogs (Score 1) 48

by PeterKraus (#42557003) Attached to: Device Sniffs Out Signs of Life After Disasters

I don't know anything about your method - "nanomaterial" is quite a wide range of chemicals, really.

Their approach seems to be an incremental improvement on tried and tested analytical methodology - I mean, GC's have been here for ages, they are the best separation technique there is for robust applications.

The "ion mobility spectrometry" part seems to me like a secondary separation-based analysis. GC lets you separate analytes by molecular weight (in similar groups of chemicals - eg alkanes), and polarity/solubility (in case of different groups of chemicals, eg. alkanes and alcohols). Those pre-split analytes will, presumably, be first ionised and then further sliced based on their "ion mobility" (which is a term I hear first time in this context) within a carrier gas - size, charge, shape...

I fail to see how this is so much different from GC-MS (in terms of results), but I only read the abstract, it's the first time I hear about ion mobility spectroscopy, and can't really be arsed looking into the paper itself.

Diplomacy is the art of letting the other party have things your way. -- Daniele Vare

Working...