Announcements

 

11/28/12: Project Winners:

 

Great job on the projects. A panel of impartial judges has selected the following project winners:

 

 

Best Presentation

Best Apparatus

Best Constitutive Law

Hallie Evelyn Amanda

xxxxxx

 

xxx

Ali + Mike

 

xxxxx

xxx

Joon-Sik, Julia, Mannoj

xxxxx

xxxxxxx

xxxxx

Kyohei, Insun, Odsseas

x

 

xx

Doug Annam Jeremy

x

 

x

Ruike, Kai, Tianyang

xx

xx

 

 

Everyone has some fans in at least two categories (unless everyone just voted for themsleves).

 

 

11/28/12: Poetry: Here is a magnificent response to the challenge to compose a poem about the divergence theorem... Other offers will be posted here... Go Brown!

Ballad on the Divergence Theorem
-A Song of Love and Integrals-

by Jeremy Wagner

There was a lovelorn mechanician,
facing Cupid's dread perdition,
daily sending vain petition
to the object of his love.
Daily sending, daily writing,
everyday on dates inviting,
losing battles always fighting
for her heart he could not move.

Said she "How can I know what lies
beneath a suitor's tender guise?
His gentle hands and lovely eyes
conceal the contents of his heart.
The features on his surface tell
me nothing of his volume; sell
me not the looks I know so well,
love is not won by lover's art.

"I will not be your Ariadne,
cast aside when once you've had me,
left alone to die and sad. Be
sure of what I tell you now:
The poems that you write today,
the kisses on my cheeks you lay
mean nothing; Inner truth will sway
me only - but you must find out how."

She gave the hand she held a squeeze,
and parted, leaving on his knees
our hero, failing to unfreeze
the heart of his beloved one.
This mechanician wandered home;
his thoughts began to widely roam
of how for once he should intone
that he loves her as he loves none.

His dinner went untouched that night,
he only had an appetite
for teasing out how yet he might
relieve his hopeless suit's travail
But leaden-lidded Somnus came
and called him by his very name
- and when he or his brother claim
a soul, no protest will avail.

So fast asleep, he fell to dreaming
(easier to bear than scheming
ways to show that more than seeming
was his promised love to her.)
But ev'n in dreams his troubles goosed
him, hounded him, and still refused
him comfort. Oh, a man abused
was he as no men ever were!

Then suddenly, an apparition
woke our sleeping mechanician,
following the grand tradition
of more famous bedside ghosts.
"Lagrange I was in life," it said,
"since then I've wandered cold and dead,
with Green and Gauss (of whom you've read)
on Hades' dark and gloomy coasts.

"You see, for lack of hobbies there,
we shades take up a special care
for mechanicians everywhere,
and rise to give advice when needed.
The cry goes 'round the underworld
'A Mechanician Seeks His Girl!'
So back up onto Earth I'm hurled:
Now let my words be duly heeded.

"I'll tell you of a lonely lad
who loved a lady, but sat sad
and wept, because the poor boy had
too little to endear him.
The lady scorned the bright-eyed youth
for want of syllogistic proof
of love. Yet without her, in truth,
the boy had naught to cheer him.
Then in an old mathematics book
He chanced to take a lucky look,
And with a shock the whole earth shook
His answer had drawn near him!
The proof was on the printed page,
the calculus would set the stage:
Young lovers two would get engaged
by the DIVERGENCE THEOREM.
Along his surface, head to toe,
he'd integrate his outward show
of love with normal dotted (so
the theorem always goes.)
This integral's equivalence
to that of true love's divergence
within him stood as fact. And hence,
his heart he could expose!
His actions on the surface told
of love he DID in his volume hold
And with a ring of solid gold
She married in a year him.
Since then, in regular intervals,
they lovingly solve surface integrals
and recall that wonderful principal
of the GREAT DIVERGENCE THEOREM."

The ghost an end of speaking made,
"That's all I'll say, son, I'm afraid.
The answer is before you laid;
No longer can I linger here.
Two married mechanicians fight
o'er frame indifference every night -
And I must set the two aright!
Now duty calls me to their care.

"A phantom's work is never done.
Take care that you might not be one!
Stay living while you're able, son."
And suddenly the ghost was gone.
Our mechanician, startled by
the haunting, breathed a heavy sigh.
The ghost's advice he vowed he'd try
tomorrow at the rosy Dawn.

And when the rosy Dawn got up,
he'd long since drained his breakfast cup.
He couldn't wait for her to sup,
So anxious was he on that day.
He tied his best and brightest tie
and pulled his argyle socks up high,
to "Bachelorhood" he waved "Good bye",
(at least he hoped things went that way.)

To his Beloved's door he came,
announced his suit in true love's name.
He promised not the tired, same
old tale he brought, but novel proof!
With patience and with hand-drawn graphs
he taught her all his vector maths,
confessed his love, but she with laughs
responded to the earnest youth.

"Dear boy, you are much denser than
a stone to think a tensor can
prove love. Would any censor ban
your mad address? I'd say he should!
"Depart, without my pity, now
You'll never have my love, I vow,
Nor will my sire a fool allow
to take my hand in his for good."

Our mechanician never saw
that girl again; he took in law-
ful wedlock someone else. Now "Pa"
four daughters call him and two sons.
And he, when met with apparitions
('specially those of mechanicians)
holds no tactful inhibitions:
Their every word he duly shuns.

THE END

And here is my lame attempt at a response...

Students often get the urge
To see if vector fields diverge...

They may feel a strong temptation
To enforce mass conservation
And in many of their courses
Need to find internal forces
In a solid under action
Of prescribed external traction.
At other times they strain their minds
As they laboriously find
The charges that they hope will yield
Some voltage or electric field.

When this occurs, they owe a debt
To Gauss, whose mighty intellect
Produced a very famous theorem
That can solve these problems for 'em.

So let us cheer, and raise the roof
Reciting this amazing proof
Whose applications are so legion.
"Let symbol R denote a region
Bounded by some surface S
Whose outward normal we express
in terms of unit vector n.
Got that? Let us continue then:

On this region let there be
A vector valued function phi
Obeying continuity.
Then int_R divergence(phi) dV
The Divergence Theorem lets us say...
= int_S phi dot n dA"

 

 

 

 

11/8/12: Midterm grade distribution is shown below

Bar graph of midterm grades


8/9/2012:
Welcome to EN2210 - we are looking forward to working with you!