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Akano's Blog



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Jackson ≪ Griffiths

Posted by Akano , in Math/Physics, Life Nov 16 2012 · 302 views
Physics, Education, Rant
I know most of you aren't physicists, but it's very important to me that physics education be designed to effectively teach physics to any and all audiences. After all, if you want people to have some inkling as to what you do, you want to be able to come up with a way to explain the necessities without getting bogged down in all the details. When you do this, it prevents the person you talk to from feeling like a moron and also allows you to talk about yourself and what you do to someone who has no clue what you do.

This is why graduate-level texts frustrate me. The authors always assume that half the stuff they're discussing in their textbook is obvious to the reader/student who has maybe seen the material once before in an undergraduate course. While some of this material should be expected to be known already, you can't just chuck stuff at your reader and say "it is now obvious that" or "the proof is trivial" when neither of these statements is actually true. If you use either of these statements in your textbook, you're not a good teacher. Period.

The title of this entry comes from the fact that I'm comparing two Electromagnetic Theory textbooks, one by D.J. Griffiths and the other by J.D. Jackson. Griffiths' Introduction to Electrodynamics is a witty, conversational, and informative text that helps undergraduates cope with the fact the E&M is really hard and that most of the concepts are foreign to someone who has only ever dealt with classical mechanics. Jackson's Classical Electrodynamics, on the other hand, is a text where the reader can tell that the author really knows his stuff when it comes to E&M, but has no sense of how to convey that knowledge to someone who is not an advanced student of the subject.

For instance, let's say I were teaching the concept of projectile motion to someone who has never delved into the subject. If I were Griffiths, I would say something like, "All objects in free fall on Earth experience a force due to gravity toward the ground. This force causes all objects to accelerate at the same rate, meaning that the rate at which something speeds up/slows down in Earth's gravity is the same for all objects regardless of how heavy they are. Because this acceleration is constant near the ground, objects tend to follow a parabolic trajectory (if we ignore air resistance). The equations that show this follow from Newton's second law, F =
m a. If you don't believe this, let's try it, shall we?"

Now wasn't that nice? This explanation is certainly very clear about what projectile motion is and what causes it. Griffiths enjoys taking concepts that may be hard to comprehend and then following through with some equations/proofs to try and clarify the situation, usually speaking to the reader as though he were sitting down with them helping them through a problem.

What about Jackson? He would probably say something along the lines of, "The reason projectiles follow parabolic paths is simple: if you solve the Hamilton-Jacobi equation in a uniform gravitational field, you will find that the path that minimizes the action is that of a parabola. This can be seen by setting the variation of the Lagrangian equal to zero."

Well that was simple, wasn't it? While technically correct, you probably have no idea what the Hamilton-Jacobi equation or Lagrangian are, nor do you probably know what "action" means in physics. Now you may be thinking, "well, these things are part of undergraduate courses, right?" Well, no, actually. I had no idea what the Hamilton-Jacobi equation was until I took graduate level quantum mechanics, and I was expected to have known that from my graduate classical mechanics course (which I didn't take until my second semester of quantum mechanics). Suffice it to say, there was a lot I had to learn on the fly, but you can probably see what I'm getting at. The assumption that students know everything you expect them to know and have it ready to go the minute you throw that curve ball at them is a terrible way to go about teaching and, in my opinion, does not foster good education.

On an unrelated note, I have a problem set out of Jackson due tomorrow which I haven't finished yet. So, how was your day? :P

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Ponies Premiere

Posted by Akano , in My Little Pony Nov 10 2012 · 310 views
Season 3, Crystal Ponies
These villains are getting less and less backstory development as we go, huh? In terms of development:

Sombra < Chrysalis < Discord / Nightmare Moon


That said, though, I enjoyed the episode quite a bit. The songs were okay, but I've only listened to them once, really. However, it was nice for Spike to get a role as Twilight's supporting vocals. Cathy Weseluck amazes me.

I did think Rainbow Dash was a bit over the top, but I enjoyed everyone else.

También, sombra = shadow en español, por tu información. :P

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So I just laughed uncontrollably for about five minutes...

Posted by Akano , in Life Nov 09 2012 · 453 views
Laughing, Insane
It was prompted by NOTHING!

I blame the large amounts of insanity in my diet.

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Griffiths is best textbook author

Posted by Akano , in Math/Physics Nov 07 2012 · 326 views
College, Physics, Textbook and 1 more...
"The proportionality factor σ (not to be confused with surface charge) is an empirical constant that varies from one material to another; it's called the conductivity of the medium. Actually, the handbooks usually list the reciprocal of σ, called the resistivity: ρ = 1/σ (not to be confused with charge density—I'm sorry, but we're running out of Greek letters, and this is the standard notation)."

This is the man who allegedly can teach physics to gerbils. I wish I could take a class with him simply for his wit and skillz at teaching.

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IT'S SNOWING!

Posted by Akano , in Life Nov 07 2012 · 285 views
SNOW, OMG SNOW
It's almost like I'm back in Ohio. Except in Ohio it snowed in late October.

Eh, close enough.

^_^

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Voting and such

Posted by Akano , Nov 06 2012 · 272 views
Voting, Election, Bandwagon
You people are all slow; I voted weeks ago :P (absentee FTW!). Thanks to all who voted, whether it was Democrat, Republican, or Bull Moose. Statisticians really appreciate having a good sample size for such things. :P

(But seriously, voting is important. Exercise those rights!)

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Not copying Squish at all...

Posted by Akano , in Pokémon, Life Nov 05 2012 · 339 views

>>

<<


Normal - Togekiss
Fighting - Lucario
Water - Milotic
Grass - Breloom
Fire - Chandelure/Volcarona
Electric - Rotom
Poison - Haunter
Ghost - Shedinja
Psychic - Lugia
Bug - Galvantula
Flying - Zapdos
Dragon - Zekrom
Rock - Tyranitar
Ground - Steelix
Ice - Lapras
Steel - Magnezone
Dark - Zoroark

Gen I: 3 Gen II: 3 Gen III: 3 Gen IV: 4 Gen V: 4/5 (if you count both Chandelure and Volcarona)

I couldn't decide between Chandelure and Volcarona, because they be beastly. I almost put Giratina with Zekrom, but Zekrom has the electric factor going for him, which, if you couldn't tell, I like. :D

Also, my favorites are very spread among gens. Akano does not play favorites with his generations of Pokémon.

(Gen II all the way! :P)

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Pokémon White 2: Postgame

Posted by Akano , in Life Nov 02 2012 · 338 views

While I technically beat the Elite Four on Tuesday, I thought I'd share my team here.
  • Anubis (Lucario)
  • Tornadus-T
  • Vanessa (Emboar)
  • Zoroark
  • Tesla (Magnezone)
  • Golduck - HM slave

I couldn't nickname Zoroark due to it being N's originally, and Tornadus I just never got around to nicknaming after I got him from Dream Radar. :P This was actually the first time I've ever raised any of these Pokémon for a team, so it was a very different game experience this time around. I wish Lucario were just a bit bulkier, because he can dole out punishment but can't really take it. I love Zoroark's speed, but man is he frail. Emboar was all right, but I definitely prefer Samurott. Magnezone was pretty awesome, too; his Special Attack is beastly.

I should raise a Chandelure when I replay through White. He looks pretty awesome...

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Happy Halloween

Posted by Akano , in Life Oct 31 2012 · 324 views
Crest of Hyrule, Bat, Pumpkins and 1 more...

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(Click for larger image)


The one on the left is my roommate's; the one on the right is mine.

Happy Halloween, BZPower. :)

(Also, check out my Haunted House review if you haven't already! It's full of awesome haunted house pictures!)

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Set Review: 10228 Haunted House

Posted by Akano , in Set Review, LEGO Oct 30 2012 · 528 views
Haunted House, Review

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Oh noes! I forgot to hang the awesome picture of Frankie in his white tux on prom night!


The bedroom looks like your typical undead sleeping pad. With pictures hanging of friends and family, some undead deer skull, a rickety unfurnished bed, and an empty wardrobe, it's ideal for the everyday vampire who's trying to get away from all the stresses of life. The writing desk at the top of the stairs is in a nice corner by the window(s) so the maximum amount of moonlight is available when writing to those creepy, alive relatives of yours. I also like that there's a railing at the top of the stairs, but no railing following them down to the first floor. Clearly safety is of no concern during the transition between stories.


Go read it. Be enthralled. Clean up your drool on the way out.

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Oak Log Bans

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About Me

Akano
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Premier Members
Stone Champion Nuva
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1,500+ posts
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Proto
+2 for Premier Membership
+1 from Pohuaki for reporting various things in Artwork


Name: Akano
Real Name: Forever Shrouded in Mystery :P
Age: 28
Gender: Male
Likes: Science, Math, LEGO, Bionicle, Comics, Yellow, Voice Acting, Pixel Art, Video Games
Notable Facts: One of the few Comic Veterans still around
Has been a LEGO fan since ~1996
Bionicle fan from the beginning
Twitter: @akanotoe

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Hieroglyphs And The Like

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