Physical Sciences
drorzel | August 5, 2010
Judge Walker's decision to overturn Prop 8 is factual, well-reasoned, and powerful. - By Dahlia Lithwick - Slate Magazine
"It's hard to read Judge Walker's opinion without sensing that what really won out today was science, methodology, and hard work. Had the proponents of Prop 8 made even a minimal effort to put on a case, to track down real experts, to do more than try to assert their way to legal victory, this would have been a closer case. But faced with one team that mounted a serious effort and another team that did little more than fire up their big, gay boogeyman screensaver for two…
krandall | August 3, 2010Don Backer, an astrophysicist at the University of California, Berkeley who discovered the first millisecond pulsar, died on July 25. He was director of Berkeley's Radio Astronomy Laboratory and the Allen Telescope Array (ATA) in Hat Creek, California - a collection of 42 dishes that recently began scanning the sky and searching for extraterrestrial intelligence.
"Memories of a special moment with Don Backer"
By Jill Tarter
Don and I had only a few glancing interactions from the time we were engineering physics students at Cornell until one memorable day in 1982. On that day I pulled my…
rallain | August 3, 2010You thought I was going to talk about a problem that math teachers could use, didn't you? Well, maybe math teachers can use this. (note: when I say "teachers" I really mean "learning facilitators")
It all started when I read this valedictorian speech from Erica Goldson. Here is part of it:
"I am now accomplishing that goal. I am graduating. I should look at this as a positive experience, especially being at the top of my class. However, in retrospect, I cannot say that I am any more intelligent than my peers. I can attest that I am only the best at doing what I am told and working the…
gregladen | July 30, 2010Can a fly's eye(s) be used for solar cells? Apparently so. Speaking of which, I have a gripe. Nuclear power supporters have always ignored the fact that Nuclear power (a.k.a. "unlimited safe free energy") is more expensive than other traditional forms of energy. In the mean time, anti "alternative" energy, often the same people, have touted that Solar is too expensive to be worth it. Well, guess what. A recent study seems to have shown that Solar power is cheaper than nuclear. So, there you go.
Berry Go Round # 30, the Plant Carnival, is up and running at Brainripples. This is your…
drorzel | July 30, 2010There's some good stuff in yesterday's post asking what physics you'd like to read more about. I'm nursing a sore neck and shoulder, so I'll only do one or two quick ones today, starting with James D. Miller in the first comment:
1) Is it true that our understanding of quantum physics comes from studying systems with only a small number of particles and there is a good chance our theories won't hold in more complex systems.
It all depends on how you define your terms-- what counts as a "small number" of particles, and what counts as not holding?
It's certainly true that most of the…
drorzel | July 30, 2010The New York Times today has a story with the provocative title Getting Into Med School Without Hard Sciences, about a program at Mount Sinai that allows students to go to med school without taking the three things most dreaded by pre-meds: physics, organic chemistry, and the MCAT:
[I]t came as a total shock to Elizabeth Adler when she discovered, through a singer in her favorite a cappella group at Brown University, that one of the nation's top medical schools admits a small number of students every year who have skipped all three requirements.
Until then, despite being the daughter of a…
jstemwedel | July 29, 2010At Uncertain Principles, Chad opines that "research methods" look different on the science-y side of campus than they do for his colleagues in the humanities and social sciences:
When the college revised the general education requirements a few years ago, one of the new courses created had as one of its key goals to teach students the difference between primary and secondary sources. Which, again, left me feeling like it didn't really fit our program-- as far as I'm concerned, the "primary source" in physics is the universe. If you did the experiment yourself, then your data constitute a…
drorzel | July 29, 2010I was initially puzzled by the headline "Research-Assignment Handouts Give Students Meager Guidance, Survey Finds," and the opening sentences didn't help much:
Most research-assignment handouts given to undergraduates fail to guide the students toward a comprehensive strategy for completing the work, according to two researchers at the University of Washington who are studying how students conduct research and find information.
My initial reaction was "If I could give them a comprehensive strategy for completing the work, it wouldn't be research." Then I noticed the last three words, and…
drorzel | July 26, 2010A few years ago, we ended up trading some classroom space in the Physics part of the building to Psychology, which was renovated into lab space for two of their new(ish) hires. This turned out to be a huge boon not only for the department (the lab space we got in the swap is really very nice), but for our majors. Most of the psychology experiments on campus use student volunteers, and pay a small amount to boost participation. Since the new psych labs were right next to the physics student lounge, our majors were taking part in four or five studies each, and racking up the study participation…
mikethemadbiologist | July 26, 2010One of the things that freaks out some people in the 'hard' sciences (and I use that term broadly) about the social sciences is that they, unlike the hard sciences, they don't restrict themselves to positive statements, but, instead, deal with normative statements. In other (less high-falutin') words, the social sciences don't only try to explain why things are, they often make statements about how things should be. This not only makes my colleagues in the physical sciences uncomfortable, but it's also viewed as lacking rigor which means your penis will fall off.
This, to me, seems both…
drorzel | July 21, 2010
Physics Buzz: APS hits ComicCon with the first superhero science comic
"For the rest of this week I'll be blogging from the madness that is sure to be ComicCon 2010. APS will be the first professional society to bring a comic book, so us public outreach folks are excited to be rolling in with 2.5 tons of Spectra comics. For you unaquanited, the convention combines all things nerd under one massive roof for a week every year. All those people in Princess Leah or Batman or Wolverine or extra #554 from scene 3 on Tatooine in A New Hope comtumes? This is their summer sanctuary. I'm not knocking…
drorzel | July 20, 2010Yesterday's post about how nobody cares about condensed matter physics produced a surprising number of comments of the form "I was really hoping you would post about topological insulators," which surprised me a bit. Anyway, since people asked for it, I'll give it a shot. The important caveats here are that 1) this isn't my field, and 2) I have not read a great deal of the primary literature on this, so my understanding is not that deep.
We'll do this in Q&A format, as that's been working well for ResearchBlogging posts lately.
So, what's a "topological insulator," anyway? You make a…
mikethemadbiologist | July 20, 2010Philip Mirowski has a must-read article in The Hedgehog Review about 'The Great Mortification': the soul-searching (such as it is) that the economics profession has undergone since 2007. Two key points in Mirowski's article are really important--and are relevant to most, if not all, intellectual disciplines. The first is "This Is What Happens When You Banish History and Philosophy":
...the task is to recount these events as a sequence of otherwise avoidable tragedies, the first of which must be conceded to have been the exile of history and philosophy from any place within the contemporary…
drorzel | July 19, 2010I had planned to spend some time this weekend trying to make sense of this new result on topological insulators, and maybe even write up the relevant paper for ResearchBlogging. Family life intervened, though, and I didn't have the time. I get enough of it to understand the basics of what's going on, but there's a whole lot I don't understand about topological insulators generally, so I'd need to do a bunch of reference chasing to get to something I can understand well enough to work back up to this week's Nature paper.
And, to put it bluntly, there just isn't that much reward for the work…
jhalper | July 14, 2010Bats may be using an innate understanding of physics to track their prey in the dark. Institute neurobiologists trained Egyptian fruit bats to fly to food in a dark lab. They found that in some situations the bats sweep their sonar to either side, catching their "prey" on the beam's slope, while at other times they point their beams head-on. Some physical calculations showed that the changes in intensity near the slope help in getting a fix on the target's direction - a very efficient strategy for localizing targets - while the direct beam is preferable for discerning a hard-to-identify…
drorzel | July 10, 2010
Energy Secy advances nano science in spare time - San Jose Mercury News
"This is Chu's second such meaty scientific paper in recent months, both published in the journal Nature.
The first, published in February, was following Albert Einstein's general relativity theory and better measuring how gravity slows time. Both were published while he has been energy secretary, but started long before he took the job in January 2009. A third study is in the pipeline, Chu said.
None of this is the sort of thing Cabinet secretaries usually read, let alone write. For the Nobel Prize-winning physicist,…
rallain | July 6, 2010It is that part of the semester where the Right Hand Rule (RHR) comes out. Really, the best part is the students taking the tests. They make all these funny motions with their hands. That makes tests more entertaining (for me) than they usually are.
What is the RHR?
Suppose I have two numbers. Maybe these two numbers are the length and width of a piece of paper. Now suppose I need to multiply length times width to get the area (A = L x W). Simple - right? But that is multiplication for scalar variables. How do you multiply vectors?
There are two common operations you can do with…
rallain | July 1, 2010Title: Chased by zombies
When I heard word about the ScienceBlogs Zombie Day, I knew I wanted to participate with a post - but I had no idea what to do. My first thought was to somehow talk about living off the electric grid in the case of a zombipocolypse - you know, like how big of a solar panel would you need?
But you know what? Physics is difficult - but modeling is easy. How about I model something? How about a model for the motion of a zombie horde? This will be great.
Zombie motion model
What do I want in my model? What are the constraints? What real-life situations can I use to…
drorzel | June 28, 2010
Power and making § Unqualified Offerings
"A colleague was complaining yesterday about the way that some faculty are treated better than others. Not so much in my department as in certain other departments. Some people, for a variety of reasons, probably do get a better deal (even if not to the extent that he thinks). I won't go into the reasons why, mostly because I think the politics is complicated enough that I can't venture a theory with any great confidence. (My colleague would beg to differ, but I think he's only seeing one dimension of a complicated problem.) However, I said to…
gregladen | June 27, 2010Even at the most extreme edges of the flow of stuff out of the volcano Pompeii, at the far edge of the mud and ash that came from the volcano's explosion, the heat was sufficient to instantly kill everyone, even those inside their homes.
And that is how the people at Pompeii, who's remains were found trapped and partly preserved within ghostly body-shaped tombs within that pyroclastic flow, died. They did not suffocate. They did not get blown apart by force. They did not die of gas poisoning. They simply cooked. Instantly.
That is the conclusion of a study just published in PLoS ONE by…