Friday, September 29, 2017
Thursday, September 28, 2017
I know of a great song that would be perfect to turn this into a Caltech-themed prank...
Given these developments, we clearly need a DJ Cookie Monster to take proper advantage of this new technology.
Sunday, September 24, 2017
As you probably know, there was an earthquake there a few days ago, but the conference is still happening (and only a few people have cancelled). The show must go on!
Friday, September 22, 2017
The inevitable celebration got delayed quite a while by our horrible slump, but we did it—and on Tommy Lasorda's 90th birthday to boot!
Next stop: the National League Division Series on Friday 6 October at Dodger Stadium.
(Tip of the cap to Michael Stumpf.)
Sunday, September 17, 2017
"I see that you have made 3 spelling mistakes." Last words of Marquis de Favras after reading his death sentence before being hanged (1790). pic.twitter.com/b4aFy7yyJM— Klaas Meijer (@klaasm67) September 15, 2017
(Tip of the cap to George Takei.)
For science! I'm collecting D&D character backstories for training neural networks. Submit as many as you like. https://t.co/phclLHHfR3— Janelle Shane (@JanelleCShane) September 18, 2017
(Tip of the cap to Jennifer Ouellette.)
We should calculate some network statistics of the Great Underground Empire map. (See the salient hand-drawn figure in the article.)
Saturday, September 16, 2017
I have only one question: Are we allowed to set the Lyapunov exponent? (Technically, I am thinking of the maximum one.)
why does my microwave have a CHAOS MODE pic.twitter.com/feV8M6uxQx— aoife (@AoifeeO) September 12, 2017
(Tip of the cap to George Takei.)
Update: It looks like chaotic dynamics actually are explicitly involved. (Tip of the cap to Melvin Leok for the link.)
Update 2: Following up on Melvin's comment, I did some googling and found this article. I still haven't figured out which system they used. I suppose I should treat this like the chaotic water wheels. The people who designed this option could have chosen any one of the standard models.
Update 3: Bah. The relevant reference is in a conference proceeding whose parent domain is dead (probably long dead). I might actually have to use a physical library to determine decisively which system was used. (Jaroslav Stark, one of the authors of the above perspective piece, died several years ago. I could potentially see if his coauthor, who I have never heard of, is reachable. The names of the authors of that conference proceeding are going to defy Google.)
Wednesday, September 13, 2017
Update (9/15/17): The Indians lost today to the Royals. They won yesterday, so their win streak reached 22 games. Wow!
Tuesday, September 12, 2017
Bee removes a nail to make a nest in a wall 🐝 pic.twitter.com/CXSjZAkVLA— Vala Afshar (@ValaAfshar) September 12, 2017
(I saw this Tweet because Sabine Hossenfelder liked it.)
Monday, September 11, 2017
Thursday, September 07, 2017
I humbly request that, when I am gone, many of these (but with my name, instead of this guy's) be made and installed at appropriate spots all over the world. I may have to put this as a condition in my will.
Also, I want my sign to be grammatically correct.
P.S. The title is an allusion to this skit.
(Tip of the cap to Gabor Vattay.
Wednesday, September 06, 2017
Title: Nonlinear Coherent Structures in Granular Crystals
Authors: Chris Chong, Mason A. Porter, Panayotis G. Kevrekidis, and Chiara Daraio
Abstract: The study of granular crystals, which are nonlinear metamaterials that consist of closely packed arrays of particles that interact elastically, is a vibrant area of research that combines ideas from disciplines such as materials science, nonlinear dynamics, and condensed-matter physics. Granular crystals exploit geometrical nonlinearities in their constitutive microstructure to produce properties (such as tunability and energy localization) that are not conventional to engineering materials and linear devices. In this topical review, we focus on recent experimental, computational, and theoretical results on nonlinear coherent structures in granular crystals. Such structures—which include traveling solitary waves, dispersive shock waves, and discrete breathers—have fascinating dynamics, including a diversity of both transient features and robust, long-lived patterns that emerge from broad classes of initial data. In our review, we primarily discuss phenomena in one-dimensional crystals, as most research to date has focused on such scenarios, but we also present some extensions to two-dimensional settings. Throughout the review, we highlight open problems and discuss a variety of potential
engineering applications that arise from the rich dynamic response of granular crystals.
Tuesday, September 05, 2017
Sunday, September 03, 2017
"On April 9, 1975, Congressman Robert Michel brandished a list of new NSF grants on the floor of the House of Representatives and selected a few that he thought might represent a waste of the taxpayers’ money. One of them (on which I happened to be one of the investigators) was called “Studies in Complex Analysis.” Michel’s comment was, “ ‘Simple Analysis’ would, hopefully, be cheaper.” I shudder to think of what might happen if certain members of the current Congress discover that the NSF is supporting research on perverse sheaves."
You can see some more details in an old blog post from John Baez.
I take that a step further and try not to spend too much time communicating with others (electronically or otherwise), and I am extremely happy!
(Tip of the cap to Hiroki Sayama.)
Saturday, September 02, 2017
I had heard of this before, and I found it today through the Twitter post below, where again note that it was uttered in 1969.
Oh Neil, if you'd only lived to see Facebook and Twitter. pic.twitter.com/USZozDmZTE— Calling Bullshit (@callin_bull) September 2, 2017
Friday, September 01, 2017
When you want to go to The Masquerade, but the only masque you have is a Lorenz attractor.— Mason Porter (@masonporter) September 1, 2017
(Thanks to Juan Restrepo for the composition.) pic.twitter.com/QNB7O912vH
(This could, however, work very well at Dynamics Days.)