Happy New Year!

Another year gone by. I think what amazes me the most about 2007 having passed by is that we are now 70% through the first decade of the millenium and 80% through the "oughts". Why so amazing? Because in October of 1962 (Cuban Missile Crisis) I had serious doubts I would make it to 2000, or even make it home from school between warning and total conflagration. [Later, we learned it was even closer than it seemed at the time, yet now we have a Presidential Press Secretary who is ignorant of the 10 days that brought us closer to nuclear war than at any time since Nagasaki. Sigh.]

It has been a good year, but I won't blog about those details right now because I have work to do to get ready for classes next week.

Next week!

That calls for ...

... a Mimosa (champagne and OJ) and a day of football.

Or, if there are others around, maybe Orange Blossom:

Two 12 oz cans frozen OJ
Three 6 oz cans frozen pink lemonade
Two liters of 7-Up
1 fifth gin

That recipe goes back to the 70s when you could buy a fifth rather than one of the metric sizes that alcohol is sold in today. [*] As the quantities suggest,it also goes back to when a lot of fellow grad students would come over to watch football. Lots of Vitamin C to cure whatever cold you might have picked up from the people at the party last night, or today.

An older one (circa 18th century) would be my reconstruction of Syllabub:

1 pint (2 C) of heavy whipping cream
1 C of wine
3/8 C of sugar
2-3 T lemon juice
1-2 t lemon rind

Premix the sugar and the wine, if convenient. (It is easiest to start with warm wine so the sugar dissolves easily, then refrigerate it until you are ready to make and serve this edible drink.) You can also include the lemon rind, but save the lemon juice for the final step. Starting about a half hour before you want to serve the Syllabub, whip the cream until it is, well, whipped cream. No pre-made shortcuts allowed! Fold in the other ingredients and chill for 10 or 15 minutes. Serve in parfait glasses (if you have those and servants preparing this for you) or plastic drink glasses (if not) with a bit of nutmeg ground on top.

Syllabub is like eating rich, alcoholic air. This would be served during a Christmas Eve or New Year's Eve party, but you could do it today if you wanted to.

[*] Alcohol converted to metric because they could sell 750 mL for the price of a fifth (757.08 mL) without anyone noticing. In contrast, soda converted to metric because they could market 2 L of what is basically water as a better deal than two quarts (1.8927 L) without really putting anything more of value in the bottle.

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Merry Christmas!

A bit belated, but not much time to blog when you are having fun!

We have been in The Great White North (literally and figuratively) since Christmas Eve, enjoying time with The Thomas and The Parents, among others.

We got a late start on the trip because Mrs. Pion had been seriously under the weather, but a real doctor and some rest took care of that. Fortunately, we had built in a lot of slack in our schedule so we really did not miss anything. Even more fortunately, the weather was even better for our drive north than it would have been on our original plan.

Even better than that, it was all white when we got here!

It is not Christmas in the Pion family without food. Suffice it to say that we arrived at 3 pm, Parents arrived by 4:30 pm (barely enough time for us to unpack the car), and the ham dinner was served by 6 pm. SisInLaw had knocked herself out as usual, with a choice of 4 pies (chocolate cream, pecan, banana cream, and lemon meringue) and banana pudding, all home made, along with Christmas cookies and ice cream. I settled for a half slice of pecan and a half slice of chocolate cream, with ice cream on the side.

Santa arrived while we slept. (The great bulk of the gifts exchanged within The Brother's family are piled around the tree by Santa. They don't accumulate them under the tree during the weeks - or days- before Christmas like we do.) Oddly, Mrs Pion and I were well rested during our trip, so we were first to get up and have breakfast, but resisted the temptation to unwrap and rewrap the gifts. The others were all worn out from getting ready for us to visit.

We were all well remembered. The gift that keeps on giving, a 1000 piece jigsaw puzzle, has kept me and their kids entertained for the last few days.

Christmas dinner, a huge turkey and trimmings, was as good or better than the night before. Although I could complain about the lack of sage in the stuffing, I really can't because Mom can't enjoy spicy food like some of us can. Besides, the stuffing was highlighted with the addition of cherries, which add their own special flavor.

Boxing Day was spent on the road, to visit Mrs. Pion's big brother in the even greater, whiter, north woods. Close to Hemingway country, if you know where I mean. We had a special delivery to make: part of our grapefruit harvest. These came from a tree that his wife had started from a grapefruit seed, and gave to us after we had moved south. It rather amazingly has survived enough winters to bear fruit. Great visit, and a beautiful drive through the north country. Once again we were favored by good weather and clear roads.

Finally, we worked in a day for a family dinner at my Parents new home, a townhouse that is part of a wonderful retirement community. I'll have to blog about being Homeless (for the first time in my life, I don't have a bedroom or even a bed in my parents home) some other time. For now, I'll close by being thankful for yet another pleasant evening with family, including a brother who should be immensely proud of how his kids are turning out.

Hope you all had a great holiday as well.

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Efficient grading (physics and math)

This will have to be the short version, since I have to do some real work tonight.

My experience is with quantitative subjects like physics and math, but since it seems to have some value for stuff that requires reading (like lab reports), it can probably be adapted for other subject areas. Details below the fold.

The starting point is that you only grade one problem (or even sub-problem or portion of a report) at a time. That was a given when grading 750 final exams in one day, because each person does one problem while piles of papers get pushed around a big conference room table, but it is also how I grade exams solo.

Here I will assume you are grading the entire exam of 40 or 50 papers yourself, maybe 400 distinct problem solutions. There are some differences when you are only going to grade one problem on 750 exams, so I will summarize those at the end.

My exams all have a cover page for the total, version, etc, so the first step is to turn the page to the first problem to be graded and invert the stack so the first papers turned in are at the top. If not, just set it up for the first problem, which might not be problem 1 on the test. If there are multiple versions, set them up so you are grading the "same" problem on all versions. This is key.

I always start grading with an 'easy' problem. I never start with one that might have N-8 distinct wrong answers. Too depressing, and it defeats the key step.

Sort the exams by answer. That is, make one pass through the tests looking only at the bottom line, the answer and its units. Completely correct answers go in one pile, ones with minor numerical variations or missing units go in another, and ones with wrong answers go in a third. Keep exams with the same wrong answer together.

Reassemble into one big stack and work through them starting at the top, or in the middle if your rubric has a key intermediate result or formula identified for that problem. Just because the answer is right does not mean the solution is right! This goes quickly for 'simple' problems, but requires a bit of care for ones where there are ways for two wrongs to make it right. It does take some experience to know which problems are likely to have 'magic' algebra steps where negative signs mysteriously change as needed, for example.

[Side remark: It is crucial that the solution be checked along with the answer. Many of the algebra weaknesses I see could only have made it into physics and calculus because an algebra or trig teacher did not check that they took the square root of a negative number and just made it into the correct real answer. I don't want that kid designing a bridge I have to drive over!]

There are two advantages here. One, the exams that deserve the same partial credit are next to each other. I may make a note on my key to say how certain errors are dealt with just for future reference, but I rarely have to consult them or look back to see how some weird thing got graded. Two, the exams are usually in the optimal order when it comes time to grade the next problem.

Next problem, same process. However, now the odds are that you have correct answers already at the top. The fact that you see a lot of correct exams before getting to the dregs is great for grader morale, which improves my efficiency. You do have to be super careful not to overlook errors on good papers or be too tough on the bottom. When a "top" paper has an error, it goes to the very bottom and when a "bottom" paper has the right answer, it goes to the very top. Sometimes I cut the deck, as it were, just to be sure I am fair (particularly for a long exam like a final).

The key is that you do not look through the entire solution for every paper, just the ones where you need to figure out what they did. Even then, you often get the efficiency of knowing that four papers all made the same kind of error in step 3 or 4 of the solution. You only have to figure it out once. After that, your eyes go directly to the error, flag it, and move on.

Handling each exam twice is more than made up for by less time spent on each one. I am also less likely to overlook an error in units or significant figures if I check that detail in my first pass. That means I also save time by not having to go back and look at an exam that was already graded.

Changes for Really Big Classes:

We would pre-grade a few dozen exams, picking out specific students from our own sections if that was practical. That would set up the rubric and give us some idea of what we had to watch for, but we also kept a sheet of paper with wrong answers listed along with the partial credit it got (and the reason why) when new ones showed up. This makes up for not being able to sort the exams. The basic idea was still the same: work from bottom to middle to top (or bottom to top to middle) of the solution to check the answer, the algebraic process used, and the physics.

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Grading

Profgrrrl has a thread about how people compute their grades. I commented there, but thought I would elaborate here.

Like her, I use a spreadsheet ... but I use Quattro Pro to do the grade computation rather than M$ XL. I also use an old fashioned grade book, which stays in my briefcase. The grade book is only for transient records (I don't carry a computer around with me), answering student questions, flagging something that will need correction (whether late assignments or a grading error) and a bit of permanence should something crash.


There was a gap where I only did research, so I can't tie my transition from paper to a spreadsheet to any specific change in the available tools. My history doing grades is quite a long one:

• Undergrad TA: All grades were calculated by hand, since calculators did not exist at the time and slide rules can't do addition. Exams and quiz scores were added up by hand, as were final averages. Some habits carry over from those times. I still keep a grade book in that style, and I still transfer the sub-total for each page to the front of the exam for final computing. That was when I was teaching math, and lots of math faculty still do it this way.
• Grad Student: I had a calculator, so most serious arithmetic was done that way. Exam scores were usually added up in my head, because I could do it faster than a calculator. Never bothered to write a grading program in Fortran because they already had one (or was it in COBOL?) for the really big lecture classes that did not have any homework grade.
• Side comment: That was where I was taught how to grade exams really efficiently. It was only recently that I learned this had a name: rubric. But it is more than that, it is an assembly-line-like process. I may blog about it if asked. Once you can grade one problem on 750 exams, accurately and efficiently, you can grade anything.
• Research Faculty: I taught some classes while on a full-time appointment that allowed that in addition to doing research. That was where I developed a grading spreadsheet in Quattro Pro that I still use today. It had three sheets (summary, homework, exams) just like mine does today.
• CC Faculty: Nothing much changed, so nothing much changed. Once you have a PC, there is not much else to do but put it on your phone. But the security issues if that phone got lost? Priceless.

My comment on Profgrrrrl's blog about not having to remember how to do formulas comes from this experience. I have not built a totally new spreadsheet since the first one, maybe 15 years ago. I've only had to make minor adjustments as my grading formula changes.

So my grading process has two stages. I first enter grades into the grade book, even if I am home where the computer version lives. They go in the grade book with the same pen I have in my hand, and are easily entered in random order. (I alphabetize exams before handing them back, but not labs or homework, so that is an important detail. I can see an entire class in my grade book, but can't see the entire list on a computer screen.) I then copy them into the computer, now alphabetically, and cross check if it is important, like an exam.

At the end of the year, I "print" the final spreadsheet info to pdf and keep it on two different computers (home and work) and in two separate hard-copy files (one with the final exams at work, the other is the actual gradebook).

I can't imagine not using a spreadsheet. Besides the advantage of getting the numeric grades as soon as the final exam numbers go into the computer, it is also easy to generate midterm and other grades for the students. I don't use Bb for this because I use a different course management system and our college does not automate grade transfer from Bb to our on-line grade entry system. I'd have to transfer too much info from one place to another to make that work.

A big part of the grade comes from HW managed through a non-proprietary course management system. I print its gradebook for each block of HW when I give an exam, and use that for two things. One, it is a hard record of those grades that get transferred into my grade book and computer, and two, it is a way to keep records on possible correlations between specific exam questions and HW performance on related problems. Are they learning? I've learned that it matters more whether they tried the problem seriously than if they got it right. Kids who get it right by using their book, notes, or (more likely) advice from friends might not do as well as kids who got it wrong but figured out what they were doing wrong after they saw the answer. In fact, I have evidence that this is exactly what happens.

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Good, Bad, and Ugly

Well, the semester is over so it is time to look back. Unlike some of the bloggers I read regularly, the end of the semester did not bring out the cloying annoying students that some had to deal with.

The Good:

My students. Not because I had a high pass rate, because I didn't. Last fall was outstanding while this fall was just above average. Because the ones who passed did a really good job. This was a class that was going to be either A or F. And since the F students will not be in my 2nd semester class, it looks like spring with this group is going to be a lot of fun.

But mainly because I just did not have any of the annoying ones that Profgrrrrl and RH were blogging about. But it was not that simple.

More of the Good:

Facilitating instead of doing. I tend to just do it. The sage on the stage. But a few weeks ago I managed to pay attention to a side comment at an engineering lunch meeting and put it to good use. A former student is part of a team building something for a national engineering competition. The guy at my table mentioned that he had been in the same competition 10 or 15 years ago. After lunch was over I introduced one to the other and watch an electric moment. You don't actually have to do the teaching to be a teacher.

Starting an ed research collaboration with an old friend from grad school. I think this is going to be really interesting.

The semester started and ended on a high note. During the pre-semester faculty meeting, my Dean closed by reading an e-mail he had gotten over the summer. He said he did not usually do this (he doesn't), which is a good thing. I could barely handle that one instance. After the first sentence I knew who wrote it, and so did the chemistry prof sitting next to me. This was a returning student, mid 30s career woman, going back to school to become an engineer. There were six of us who changed her life. I did not mind that I was an afterthought at the end, because it was the other five who got her to my classroom prepared to succeed. And just yesterday I got a note forwarded to me by one of the math faculty, a note thanking him for his clarity in teaching vector calculus and mentioning my efforts (the previous spring) as well. Most of the time they just walk in the door in August and walk out in December and you never really know whether you had an impact.

Yeah, and there was the Iraq war vet I ran into in the supermarket just last week, who is showing that an average CC student who put an emphasis on learning can kick butt when put up against those kids who started at the university. He even has one company ready to hire him after just on summer as an intern. And there was another vet, an ex-Marine (as if there is such a thing) from the inner city slums of a northeastern city who stopped by in August to tell me he had graduated and was off to take a job in Washington DC. Every one of those stories helps dispel the myth that CC students are inferior and helps the next group do even better.

Oh, yeah, and profgrrrrl is well on her way to earning tenure.

The Bad:

Too many meetings. I knew serving on a major (actually, the most major) college committee would be a strain, but you never know for sure until it happens. To those who know, there is nothing more that needs to be said.

The kid who had more persistence than sense of reality. The odds of passing the course with a great final exam are not good if you averaged 65 on the hour exams. He did not even make 50% on the final. I suspect, from what I saw in the lab, that he confused understanding how to do a HW problem with getting it right after someone told him how to do it. That might help on an hour exam, but it won't work on the final and he proved it. But maybe he will be in the 'good' category after next semester. I have seen that happen, and maybe he needed to fail the final exam to really learn that his approach will not work.

The Really Ugly:

One of my lab TAs did not turn in his grades on time. No trouble with the students, but trouble with their teachers! That was a completely new experience for me. Sigh. I suspect graders block or terminal procrastination. I saw some hints of trouble but never suspected it would turn out this badly. The worst thing is that he is a really good teacher in the lab. I see a stressful spring.

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Grading Playlist

Pretty good progress grading so far. Got all of my final lab reports and lab exams graded so they could be returned at the final exam for the lecture course, and wrapped up the final exam for one class (the small one). That took me through

• Cream: Strange Brew
• Beach Boys: Made in the USA
• Heart (the debut album)

...

• Jethro Tull Original Masters
• Led Zeppelin
• Beatles: With the Beatles

which carried me through on-line grade entry for those three classes.

On tap is my larger class, where I still have to "take" the exam and write out the grading key. That will probably look like

• The Beatles: Love (to work the exam)
• Led Zeppelin (reprised due to recent concert)
• Jimi Hendrix: The Ultimate Experience
• Les Negresses Vertes: Mlah
• Temptations: 17 Greatest Hits

If that does not do it, I'll add an update.

PS - Gotta love the tune "Zobi La Mouche" from the debut album of Les Negresses Vertes, a French band whose use of folk instruments (including the accordion) produces a sound that reminds me of Cajun music. Great energy for grading. The only problem with it showed up when I asked a young french post-doc to translate the lyrics. She was too embarrassed to tell me more than what the title meant.

Addendum: I did have to add a few disks to finish that last exam. Since I knew that I needed to think hard about the N-8 distinct wrong answers to a problem some of them found particularly hard, then slam through the last few problems and add them up, I went with

• Beatles: Rubber Soul
• Miles Davis: Relaxin'
• Yes: Fragile
• Beethoven: 9th Symphony (Dresden Philharmonic with the Berlin and Leipzig Radio Choruses)

That did it.

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Holiday Music

Time to destroy those childhood mythologies: Check out this remix of Alvin and the Chipmunks that has been slowed down so you can hear the original vocals. From M-1.US.

On that thought, need some Mashups with your mashed potatoes?

Check out SantasticIII in 3-D.

If you like that, go back a few years to SantasticII: Clausome! (2006) and Santastic: Holiday Boots 4 Your Stockings (2005).

Motivated by an article by Dean Dad complaining about lousy christmas music. He's never heard "Dreidel All The Way".

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FSM at a national meeting

There is an amusing report in a blog about a session devoted to the subversive value of a parody like the Church of the Flying Spaghetti Monster. If you have never heard of it, FSM was invented in much the way Intelligent Design was invented, but for the opposite reason.

The FSM is quite popular around our department, since some of the biology folks regularly encounter kids who have been taught bogus biology in Sunday School. We are now seeing it spread to geology and oceanography (somehow global warming is against the bible) as well as physics (radioactive decay and entropy).

One office has a "What Would FSM Do?" sign on the door, and another of my colleagues went so far as to make up a Christmas decoration featuring a stylized FSM made of LEDs. The latter is quite pretty.

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Enchanted!

We saw Enchanted this weekend, and highly recommend it to anyone, whether you have children or not. Indeed, I'd guess that half of it is wasted on children unless they have been raised on all of the Disney classic anime, but particularly Snow White (1938) with a strong bit of cross-polination from Cinderella (1950) and perhaps Sleeping Beauty (1959).

The movie was great fun. (Possible minor spoilers follow, but some might enhance your viewing experience.)

It's about time that Disney take a chance by poking fun at their competitors in addition to their own movies. I mean, was that a Troll or an Ogre that Prince Edward (!) captured? Could have been Shrek's cousin. And are they suggesting that the other Prince Edward is a bit dim? I'd love to hear a UK audience watch this movie!

As a fan of Disney animation, the opening scene was a delightful surprise. The long zoom through the woods was not quite at the level of Pinocchio (1940), but it was brilliantly done. (If you have never seen that movie, check it out.) I also found the ballroom scene interesting as a tribute to the dance scene from Beauty and the Beast, which was an early triumph of 3-D computer animation rendering the chandelier.

If you watch the entire frame, you might catch a glimpse of Totoro. I missed it, but my wife says a Totoro toy was in the lower right corner of the frame during a scene in the daughter's bedroom.

A real test of any movie is whether a scene is so good that it is not spoiled by having seen clips of it in the ads or in a trailer. That is definitely the case for the scene where animals (and insects!) clean the apartment. The actual scene has much more than they gave away in the trailers, and the ad version was pretty good. Best of all, even though it was obvious how it had to turn out, it was far from clear exactly how they would get there. As expected, they live happily ever after, but the details are entertaining as can be.

Susan Sarandon rocks as the evil queen. She looked like she belonged in NYC.

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A Disc for PG

This is not a compact disk, it is the real thing, posting inspired by Profgrrrrl's blog this evening about listening to an "old" CD by Billie Holiday.



I wonder if her digital CD will be playable when it is over 60 years old.

My Mom bought this 78, and others, with money she earned from her first job while in high school. This side, "Am I Blue", is a classic, her signature song. The "B" side is "Long Gone Blues" with Lips Page on Trumpet.

I find it interesting that this song is described as a Fox Trot, because it does not swing like the big band songs one would normally associate with that dance.

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Finishing the Move

Monday will be a special day, as my parents move out of their home of 30+ years and downsize into a townhouse in a retirement community where many of their friends already live. (I think part of their anticipation of the move comes as they realize that they know more people within a few blocks of their new place than they know in their current neighborhood, as long-time residents have made room for young families. It is also a really nice place.) But that is for another blog entry.

Today (Saturday) was an even more special day. My brother finally moved the last boxes from his college days out of my parent's basement and into his own. It took two trips in the family minivan, I am told, although that included some items from the house that are going to him. But only some.

Just in case you can't guess how long they might have been down there, his oldest child graduated from college about 2 years ago. Yeah, those boxes have been down there about a quarter of a century. The word from my parents is that he has found all sorts of treasures he had forgotten he even owned.

All I can add is, just wait until Thanksgiving and Christmas. I know for a fact that he is going to get some really priceless gifts this year, since I got some great ones when my parents were here last month. I did not blog about any of it because I don't want to tip him off about what might end up under his tree, but one of them left me speechless.

Exactly where they are going to go in his house is the real puzzle, since the 2-car garage and basement are pretty well packed with ... well ... with a quarter century of accumulated stuff, mostly the prized possessions of his three kids along with all of the usual necessities of suburban life.

The interesting question for the future might be: How long will his kids keep their stuff in his basement after they get their own homes and families?

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Shakespeare never said this ...

I can't resist time-wasting junk like this (from Dr. Crazy via Profgrrrrl), particularly when it does not take much time to do it:

It is the physics,
The physics above us, govern our conditions.

Which work of Shakespeare was the original quote from?

Get your own quotes:

Heck, that was so easy that I will try another:

Come not between the Dr. Pion and his wrath.

Which work of Shakespeare was the original quote from?

Get your own quotes:

Heh, heh. That one is priceless!

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Veteran's Day

Or should I say Armistice Day, as it used to be known?

In any case, Monday may be the official holiday, nationally and in some states, but today is the real one ... remembering the 11th day of the 11th month of 1918 when the guns fell silent at the 11th hour.

So give your favorite veteran a call today. You never know which Veteran's day will be his or her last one, and it is not just the WW II vets who are fading away. Plenty of Vietnam vets are getting on in years along with the vets who got the Tom Brokaw treatment. Which reminds me: I really should give my brother-in-law a call.

I'm glad I know the story of how he won a major combat medal while doing what would seem to be the safe job of a court reporter at a field court martial that got a bit hot. He, like most men who have seen combat, doesn't talk about it much. Similarly, a good friend did not find out his father's combat history in the Pacific until after he died. For good reason, I suppose. If you ever happen to see the film shot by combat photographers as the Marines landed on Tarawa, you'll get the general idea that the experiment might be hard to explain.

My grandfather, who served in France during WW I and told a priceless story of Armistice Day, also said little about his service as a combat engineer. I only know about the time he took a shrapnel hit in the helmet and when he got a "touch" of mustard gas that sent him to a rear-echelon job driving an ambulance. Although this gas was not one developed by Fritz Haber, I still find it outrageous that Haber won the Nobel Prize in Chemistry in 1918. Oddly enough, his contribution to using chemistry for mass killing during WW I is not even mentioned in the bio on the Nobel site.

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Space Shuttle Reentry Track

The Space Shuttle will be landing at the Kennedy Space Center tomorrow (Wednesday) just after lunch. It will land at 1:02 PM EST if it comes in on orbit 238, and about 2:36 PM EST if it has to wait for orbit 239. The reentry track will take it across the continental US, offering some great viewing opportunities.

Information on the shuttle mission and maps of the reentry tracks can be found on the NASA shuttle web site.

The primary track will take it across the midwest (central Nebraska, NE Kansas, SW Missouri) at very high altitude, then across central Alabama, possibly right over Columbus GA, south-central Georgia, then heading south just west of Daytona Beach to KSC. It should be over Alabama and Georgia about 10 minutes before landing.

Based on past experience, you should hear the distinctive double sonic boom a few minutes before landing. It takes it a long time for sound to travel down from something like 200,000 feet (40 miles) plus whatever your sideways distance adds to the hypotenuse; meanwhile, the Shuttle is making pretty good time towards Florida at over Mach 10. If you are close to the track, the sonic boom is thunderous and unforgetable.

The later landing path takes it across Utah and Texas and then along the Gulf Coast, crossing Florida a bit south of Ocala.

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Grading Jail

Prompted by Profgrrrrl's article about her grading jail. Mine is not nearly as fancy as hers ....



... maybe because I do this (grade lab reports) every week, not just for a few exams during the semester.

Note the distractions, which are necessary to maintain sanity when reading a dozen or so versions of the same thing, each with their own annoying errors.

Interesting that we both have a remote control in there. My "background music" is usually football or basketball. I really like to grade during Monday Night Football. You can work along and only have to look up when there is something worth watching in a replay.

One thing of note: These students are doing a really good job of preparing their reports. The nicely organized cover page with an executive summary of the results that you see is actually a typical one for this class, which is the second semester I have had them. I always have to remind myself to tell them that they are doing a good job of getting ready for the advanced labs (and massive reports) they will encounter in engineering college. They have come a long way. They don't even whine very much any more.

This also reminds me that I really need to get back to a pair of articles on teaching labs, and the role of reading and writing in physics and engineering. Later ...

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First Century

One hundred posts.

The statistics sure show the effect of a CC teaching load.

March (16)
April (20)
May (17)
June (18)
July (10)
August (7)
September (6)
October (5)
and this one in November.

There was a bit of early enthusiasm and a backlog of ideas at the start, but it is also the case that the only thing to do towards the end of the spring semester is grading related. All of the prep was done a long time before, and only a few exams remained to be written or fine tuned. I was even teaching during the first half of the summer, but that light load left lots of time for other things. The drop off in July was when I started prep for Fall semester.

Students don't realize that our work load is totally out of synch with theirs. They work the hardest toward the end of the semester, studying for exams, while we work the hardest early in the semester, or even before it. That is particularly true when coordinating courses (which is part of my additional duties, not counted in my contact numbers or teaching load). Everything has to be planned out in detail several weeks before the semester starts so syllabi can be printed and outlines given to the people teaching the courses I coordinate.

That is why faculty are so punch drunk about now, since we are finishing up the last exams for the year, grading, but also preparing for Spring semester. That has to be done before Christmas break, since the few days after New Years are not enough to prepare anything that has to be in either the student's or the instructor's hands by the first day of class.

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Funk Shui

Need to do some catching up. This photo is from a couple of weeks ago, after we had finished cleaning up the dining room for a visit by the Parental Units, as my brother put it in a comment on another blog.



I suppose it is obvious that this was not the result of any interior design planning on our part!

The glasses are a relatively new acquisition, intended for beach (or wish-we-were-on-a-beach) use, as is the plant container. I was intrigued by the way they sort of fit into the usual rule of three for fung shui design.

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Practical Nobel Prize

It is about time (said even though I am a theorist)!

This is the time during the semester that we get to magnetism and the physics of important practical phenomena such as the Hall Effect (which is used to measure magnetic field strength, characterize the properties of semi-conductors, and, in its quantum version, establish a standard voltage). I always point out to my class that the mundane physics of such things as magnetic disk drives, like the mundane chemistry and physics of batteries, is as crucial to modern technology as the silicon chip ... and much more important to the functioning of our economy (or military) than electro-weak unification and other cool subjects of high energy particle theory that got all the press back when this work was published.

It is great to see a practical discovery related to magnetic data storage rewarded with a Nobel Prize.

This year's Nobel Prize in Physics was given to Albert Fert and Peter Grünberg for discovery of the Giant MagnetoResistance effect. This effect is used to read the tiny changes in magnetic field that signal the difference between a zero and a one when data are stored on a magnetic disk storage device. It has made possible the rapid (to someone as old as I am, spectacular) decrease in size of computer disk drives. For once, the media are not exaggerating when they say that this recent (late 1980s) discovery from basic research made the iPod possible.

One simple example: We own a half terabyte disk drive that is smaller than a Harry Potter novel. That is 500 gigabytes, for those who don't yet know the nomenclature, essential to backup all the data generated by a digital camera. A bit over 20 years ago, just a few years before the GMR discover was made, I used a computer system that had a terabyte (1000 gigabytes) of storage mixed between disk and automatic tape drives. That terabyte of storage took up a space larger than our house.

I won't elaborate on the physics, which is way outside of my personal expertise in nuclear physics, because general information on the discovery, as well as links to pdf files suitable for the general reader as well as physicists, can be found in the press release from the Nobel committee.

Addenda:
A comment over at Uncertain Principles included a link to an IBM corp article on R and D that puts GMR to work.

When talking about this to my physics class, I remembered that a computer I used for my thesis research had a 1 megabyte (0.001 gigabyte) disk for key programs (operating system, compiler, device drivers) that was a beautifully polished platter about 2 feet in diameter. A factor of a million in data with a reduction in volume of maybe a factor of 10, not to mention an increase in reliability and a drop in cost by what is probably a factor of a million in current dollars.

I also pointed out in the lab how important it is to have reliable contemporaneous lab notebooks in ink to help document your independent discovery that might lead to a valuable patent if not a Nobel Prize.

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Cranberry Relish

Profgrrrrl's sick-bed comment about waiting for cranberry season so she can make cranberry sauce prompted several comments, including one about cranberry relish. That would be the real thing, made with orange rind, not the oversweetened commercial stuff that comes in a can. Tart and yummy (as garnish or spread on toast or waffles) and with enough Vitamin C to cure what ails Profgrrrrl.

The recipe from dear departed Mother of Mrs. Pion follows below the fold.


Cranberry Relish

• 3 pounds fresh cranberries
• 6 to 8 large apples
• 6 oranges
• 1/3 C sugar for each cup cranberries
  

Core apples to remove all seeds, chop apples and oranges into pieces, grind all ingredients (including apple and orange peel) into relish with food grinder. Add sugar and mix well. Refrigerate.

Comments:

This relish is uncooked, so wash everything you use. These days, I'd recommend a second rinse.

This is the original recipe. The reference to "large apples" is maybe 50 years out of date. Back then a large apple would be more like today's normal ones. In addition, she used the thin skinned juice oranges rather than thick skinned navel oranges and removed the seeds while chopping them into a size that will fit in the grinder. If you use oranges with a thick skin, you might want to discard some of the white part of the peel, which can be bitter. You definitely want the yellow peel!

Best used after it has been refrigerated for a few days to blend the flavors.

We use an old hand-cranked food grinder, alternating between berries, orange, and apple as we go. Don't overdo it if using a food processor. It should be fairly coarsely ground, just enough to shred all the skins.

This makes a lot of relish, enough for the entire holiday for a large family! A more plausible size for most of you would use one orange and one apple to a half-pound of berries, which is probably about 2 C (plus or minus). You can vary it to taste, of course, and no two batches (or recipes) are the same. For example, the "Joy of Cooking" uses 1 orange, 4 C berries, and 2 C sugar (a lot more sugar than our recipe, which is tart rather than sweet), while the Mennonite "More-with-less Cookbook" uses 1 orange (seeded), 1 apple (cored), 2 C berries, and 1/2 to 3/4 C sugar or honey, plus (optionally) 1/4 C nuts.

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Time to say "hey"

Time to delurk, maybe let me know you should be in my blogroll.

You could also post a topic request. Any physics topics of interest out there?

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