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Electron band structure in germanium, my ass (2001)

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Re: Electron band structure in germanium, my ass (2001)

#201
post #160
post #153

Earlier quoted context omitted.

Yes he learned to avoid physics. Good job teacher!

Well, yes unfortunately, but the takeaway should be scepticism of the validity of learning institutions, something most of us aren't prepared to even consider at a younger age.

> scepticism of the validity of learning institutions

Can confirm, this is solidly wedged into my opinions now. There were a lot of other experiences after this to compound that feeling.

In High School, I started looking aggressively for a less traditional path and fortunately found one. It really saved me, because I was forced back into the traditional environment in Senior year of high school, and my grades tanked from top-of-class to "you might need summer school to graduate" level

Things got a lot better in college, because that experience (among others) helped me effectively navigate the institution, jump directly into more advanced coursework, and earn more freedom to study things that were interesting to me.

I did get a job in my field out of college. So, my college pedigree was useful practically (though not really any knowledge I got there). But, I'm self-taught dev now, which is an amazing fit for my experience and attitude.

Re: Electron band structure in germanium, my ass (2001)

#202
post #176
post #151

Earlier quoted context omitted.

ALWAYS suspect some fuckup on the part of the knowledgeable people... especially them! Trust, but verify.

Yes, my strict adherence to “trust but verify” was born from literal tears. It’s not worth trusting others if it takes a small fraction of the projects time to verify. It has saved me incredible amounts of time in my professional life, and I’ve seen months wasted, and projects delayed, by others who hadn’t cried enough yet.

I would love to hear some of your examples, if only to reinforce your lesson to myself.

Re: Electron band structure in germanium, my ass (2001)

#203

Anyone who did undergrad lab work around 2000ish might throw in some comment about lab view software and the number of times it crashes and loses all your data

Lmao my entire undergraduate physics program is still entirely labview instruments.

Re: Electron band structure in germanium, my ass (2001)

#205
post #28

Earlier quoted context omitted.

Why is it a jab at physics? It's honest and beautiful -- I imagine this is exactly what an experience on the cutting edge of experiment is like! :D Making this measurement (an ancient discovery) with latest equipment is easy, but imagine what it might have been like for the people who actually discovered this property of germanium . Our tools/probes cannot advance much faster than our understanding of a (related) sub…

I mean if you didn't already know how to solder to Germanium crystals you would have had to spend months experimenting with the material before you could get leads to stick.

Google said (AI result):

  Soldering a lead to a germanium crystal typically involves using a gold-germanium solder alloy (like 88% gold, 12% germanium) due to its compatibility and good bonding properties
Also one of the search results implied etching first could help remove germanium oxide and used a different solder: https://www.researchgate.net/post/How-to-solder-germanium-wa...

Plus you'd need to decide how to get a good thermal connection to set the temperature of the crystal - maybe via one big lead?

Being in the future makes some things simpler?

The little experience I've had with lab physicists showed they needed a good ability to build, debug and maintain their own equipment. You can't always rely on technicians.

Re: Electron band structure in germanium, my ass (2001)

#206

Earlier quoted context omitted.

I can totally relate. I had the same experience in grade school science class, where the teacher assigned an experiment with a suggested solution and an invitation to come up with your own method. I was the only person in class that chose to do my own method. And, it didn't work because I didn't account for an environmental difference between my house and the school classroom. And, he gave me a failing grade. It real…

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No, indeed I found a way to skip physics in high school (though this wasn't really why). But, I was interested in Biology, taking almost enough for a minor in it in college.

I'm a self-taught dev now. And, that fits really well for me, despite being completely unrelated to my college degrees. I work mostly with other self-taught, passionate about software people. And I'm loving that.

But, I do have very strong opinions on institutions and pedagogy. I've gotten into some pretty epic arguments about it with my wife, who is a music teacher. And, her experience has been so completely opposite of mine.

From the way she tells it, classical music seems to be the ultimate discipline where structured education is paramount. And, I have such a negative opinion of traditional methods that it's caused some friction.

Re: Electron band structure in germanium, my ass (2001)

#207

Earlier quoted context omitted.

I took and then TA'd a class where the semester long project was to control robots (it was a software engineering principles class, the actual code writing could be done in a single weekend, but you had to do all the other stuff of software engineering- requirements analysis and documentation etc). We had a software simulator of the robots, and the first lab was everyone dutifully writing the code that worked great o…

Just out of curiosity, were you up-front after the fact that this was part of the exercise? We had a first-semester freshman year course that all incoming students were required to take. The first assignment in that class was an essay, pretty typical stuff, I don't even remember what about. A day after handing it in, roughly half of the class would be given a formal academic citation for plagiarism. That half of the…

If someone complained to us TAs during or after the lab that the simulators were incorrect, we were quite open that indeed they were, and that was not our doing, but we were okay with it because lying documentation was a part of the real world.

The professor had been doing the class with those robots for several years when I took the class the first time, but I don't know if he acquired that brand of robots because their simulator was broken or if that was just a happy accident that he took advantage of.

The lesson certainly has stuck with me- this was one lab in a class I took almost a quarter-century ago and I vividly remember both the frustration of not moving the robot and the frustration of everyone in the sections that I TA'd.

Re: Electron band structure in germanium, my ass (2001)

#208
post #124
post #99

Earlier quoted context omitted.

What I don't understand is why it took you 8 weeks to distinguish a timer from a transistor. That doesn't make your professor's reaction alright, I just find it puzzling.

Same package. 555 is typically a DIP-8, transistor packages are available in the same. So you would have to examine the cryptic markings and compare them with the other students, and that’s only if you suspected some fuckup on the part of the knowledgeable people.

But that's the thing that both students and often the teachers forget. We don't run labs to go smoothly, we run labs because you'll have to troubleshoot. There is no learning experience in a lab that works without issues, in fact IMO if lab instructions are of the step by step type, they should always have some deliberate errors in it to get students to troubleshoot.

To play devil's advocate, just imagine the previous posters Story at a company, i.e. a junior engineer not being able to make some simple tasks work and telling their supervisor "it doesn't work" and it turns out after 8 weeks they grabbed some wrong part. Should they have expected their supervisor to check all the parts? Should they expect a good performance evaluation?

Re: Electron band structure in germanium, my ass (2001)

#209
post #27

One of my Core Memories when it comes to science, science education, and education in general was in my high school physics class, where we had to do an experiment to determine the gravitational acceleration of Earth. This was done via the following mechanism: Roll a ball off of a standard classroom table. Use a 1990s wristwatch's stopwatch mechanism to start the clock when the ball rolls of the table. Stop the stopw…

> no matter how many times you are solemnly assured otherwise, you are never graded on whether you did your best and honestly report what you observe. From grade school on, you are graded on whether or not the grading authority likes the results you got.

Wouldnt've helped me before late high school, but that "whether or not the grading authority likes the results you got" part cuts both ways. That is, if you put some extra effort into presentation, you can get at least some of authorities to recognize your effort. Or, if you're really good, you can even bullshit wrong results past them, as long as you give a strong impression of competence.

Or at least that's what undergrad studies taught me; for random reason I went into overkill for some assignments, and I quickly discovered this worked regardless of the validity of my results.

I guess a big part of it is that most other people a) don't really put in much effort, and b) don't see any importance of the work in larger context. So I found that if I showed (or faked) either, I was set; show both, even better.

(Though it didn't work 100% well. I distinctly remember spending a lot of time figuring out how to simulate lexical scope and lambdas with strings & eval in Lotus notes. My professor was impressed, even suggesting I write the details up, but then she proceeded to fail me on the exercise anyway, because I didn't actually do half of the boring things I was supposed to.)

(It also taught me to recognize when someone else's deploying smokescreens of competence to pass lazy or bad results.)

Re: Electron band structure in germanium, my ass (2001)

#210

Earlier quoted context omitted.

100 + 28 degrees are not harder to mark than 64, and then aim 0 and 100 properly. :-/

What would be the process to do that? To aim 0 and 100 properly, you'd need a tool to calculate a 100:28 (25:7) ratio on an arbitrary distance, wouldn't you? One can build such a tool, but it's not a doubled-over piece of string.

Make marks on the thermometer at 0 and 100 degrees C, then project light from a candle to a wall to see these marks with say 5x magnification. Now project marks from the 128 mark ruler to the same wall and align marks from both, then place marks on the thermometer with 5x better accuracy.
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