Klein Hsu' blog 盛宴之後 After the Party...

Martin Hellman, co-inventor (well, at least in the U.S., independently from the U.K. team in GCHQ) of public key cryptography, cited by the book Code Book , "... only fools keeps trying. You have idea number 1, you get excited, and it flops. Then you have idea number 2, you get excited, and it flops. Then you have idea number 99, you get excited, and it flops. Only a fool would be excited by the 100th idea, but it might take 100 ideas before one really pays off. Unless you're foolish enough to be continually excited, you won't have the motivation, you won't have the energy to carry it through. God rewards fools" We have been little, but not completely fool for a while in the lab. And we got a little reward. We might continue to be.

Richard Feynman, in Character of Physical Law , (p. 168) "What are these philosophies? They are really tricky ways to compute consequences quickly. A philosophy, which is sometimes called an understanding of the law, is simply a way that a person holds the law in his mind in order to guess quickly at consequences." Reminds me of Dr. Shepard quoting his professor, "Never start the calculation until you know the answers." That's the understanding of laws and the physical picture. Not any less important in experimental physics. One needs to have very good physical pictures, especially at micro-scales, to guess "what is going on down there." Good physical picture helps designing, de-bugging, getting results much faster, while a bad one throws one into confusion and frustration.

Richard Feynman, in The Character of Physical Law , (pp. 163 - 164) "I am sure that history history does not repeats itself in physics, as you can tell from looking at the examples I have given. The reason is this. Any schemes - such as 'think of symmetry laws', or 'put the information in mathematical form', or 'guess equations' - are known to everybody now, and they are all tried all the time. When you are stuck, the answer cannot be one of these, because you will have tried these right away. There must be another way next way next time. Each time we get into this log-jam of too much trouble, too many problems, it is because the methods that we are using are just like the ones we have used before. The next scheme, the now discovery, is going to be made in a completely different way. So, history does not help us much."

突破林立的重圍 物件導向的insight 物件，就是那流動的粒子 物件，是力的計算 他們漂亮地分割了性質和行為 粒子有性質 力決定行為

With purely repulsive potential, how can I get the Molecular Dynamic simulation settle down into lattice?

别人交待的事作到就好。念文献、这类背景的事自己要抓紧时间作，别人不会给你留时间的。 --Dan

Sasha asked, and I was speechless. I couldn't answer.

Realized the possible connection/difference between Yukawa potential and DLVO potentil, though not yet confirmed with someone who knows these, that we might have assumed that particles have 0 radius, and then the kappa dependence of the prefactor in the e^(-kappa r)/r potential disappears. That's Yukawa? If we keep the finite size of the particles, we will have kappa dependence, and that makes DLVO potential? Realized the asymptotic behavior of DLVO potential in the large NND and small Z limit that reduces to Coulomb potential. In this light the seemingly weird behaviors of DLVO are de-mystified. It's a very strongly charged and very packed (distances small) system after all. When this kind of thing, 伊林's comes up: “物理是愈念愈少的。”

Kinematics---Study of physical motion. Dynamics---Physics of the effect of forces on motion. kinematics + dynamics form the branch of physics known as Mechanics. --from Dr. Vincent Liu's Introduction to Physics I lecture slides.