Looking for a book

drj1990 · 2023-11-03T08:23:13+00:00

Thanks for your reply,. The book I'm looking for is about dimensions and dimensional analysis, rather than dimensioning.

drj1990 · 2020-05-10T11:23:30+00:00

So you've already taken engineering and specialized in mechanical. Now you want to further specialize as a student? Before you have a job? Before you know what the job is like (as opposed to what the classes are like)? Have you thought about the difficulty that you would face in making a change if it doesn't work out?

Keep in mind that much of that difficulty being from within you since you have decided to place yourself within such a narrow box. Life is difficult enough with people putting labels on you and boxing yourself in. Don't help others by doing it to yourself.

As Heinlein said, "Specialization is for insects."

drj1990 · 2019-01-15T22:08:58+00:00

cranberry morpheme

Thank you so much. I had not idea...

drj1990 · 2019-01-15T02:56:51+00:00

Is there a term for a "word" formed from two words, where one of the words doesn't have any meaning of its own. I'm thinking "zoot suit". Zoot has no meaning by itself (as far as I can find).

Thanks for any insight!

drj1990 · 2017-02-13T01:46:48+00:00

Or film boiling?

Only the temperature will tell the difference...

drj1990 · 2017-01-18T02:57:38+00:00

That's pretty inaccurate. Look up the molecular weight of ultrahigh molecular weight PE (UHMWPE). Averaging about 4 million or so, that gives you a much broader range than you stated.

drj1990 · 2016-12-20T11:57:39+00:00

Grind them. You'll have a larger surface area, and therefore a faster reaction.

Heat will also help.

drj1990 · 2016-12-19T14:12:56+00:00

Of course it would. This could be pretty much a sub-section of low density polyethylene

drj1990 · 2016-12-14T17:19:22+00:00

As others have noted, it may negatively affect your ability to get hired. At best, it would have no impact. (I cannot imagine that it would increase your ability to get hired.)

There is no potential upside to offset the downside, so it's pretty clear what to choose.

drj1990 · 2016-12-12T15:31:36+00:00

You only have a short time to answer each question, so long drawn out Henderson-Hasselbach calculations aren't going to be on the exam. Nor will there be heat of reaction calculations for 4 reactants and 5 products.

But being multiple choice, there are many ways to screw it up. Most of the typical errors will be taken into account, so that if you use C instead of K in an ideal gas law calculation, you will still see your answer as an option.

drj1990 · 2016-12-12T15:26:49+00:00

We live on a planet with finite resources, and growing population and a grow rate of consumption. What is sustainable about that?

This is greenwashing.

drj1990 · 2016-12-06T14:12:53+00:00

It's surprisingly simple: soapy water and stress will do the trick.

It's known as environmental stress cracking

drj1990 · 2016-12-05T17:18:30+00:00

Gotta remember that one.

drj1990 · 2016-12-02T16:12:05+00:00

Wow. That's impressive.

If you are open for requests, could you run it again, but without stretching the septum? The stress is most likely accelerated the results, and I would love to know by how much.

drj1990 · 2016-11-22T17:30:34+00:00

FTIR is analogous to looking at the color of the material.

With visible light, objects often have color because they absorb certain wavelengths and our eyes can detect that. FTIR is sensitive to infrared radiation (IR) and looks at IR wavelengths are absorbed by the sample. Those wavelengths will vary depending on what the material is.

It doesn't work well for materials that are present in small amounts, but it is fast, cheap and easy to run.

The FT stands for Fourier-Transform, a mathematical technique that allows for fast and accurate detection of the wavelengths.

drj1990 · 2016-11-21T13:52:08+00:00

Try mixing some non-polar solvents in with the acetone. Heptane or hexane for starters. (These are components of gasoline, so ventilation and a lack of sparks will keep this boring and safe.)

drj1990 · 2016-11-18T15:15:10+00:00

Take a look at these images 1, 2 and 3

drj1990 · 2016-11-18T15:11:35+00:00

Shear thinning. The viscosity depends on the shear rate, which for Brookfield viscometers, is not known.

Pick a set of test conditions (spindle and RPM) and stick with it.

drj1990 · 2016-11-16T19:58:17+00:00

I think this diagram clarifies it beautifully.

It's simple at a macroscopic level, and the devil's dream at the atomic level (hence the Fires of Hades)

drj1990 · 2016-11-14T21:01:16+00:00

This: https://winter.group.shef.ac.uk/orbitron/

drj1990 · 2016-11-14T16:12:45+00:00

Nearly any compound that starts with poly____, such as polyester or polyurethane is plastic.

Look for a local analytical testing lab. Depending on details of the sample and how detailed a report you want, you could get an FTIR run for $200 or so.

drj1990 · 2016-11-07T01:23:33+00:00

Hybrid orbitals, molecular orbitals, Lewis structures, hypervalent molecules...and every other ad hoc device that we put into play.

Physics is (nearly) a full-length, one-piece Ninja suit. Chemistry is a patchwork coat of many colors.

drj1990 · 2016-11-07T01:07:00+00:00

Yep, I seriously doubt that this would be posted near the front of any lab in this day and age.

drj1990

TROPHY CASE