May 9,2015 Rogysemi7th was held. In this I spoke to rogies showing this slide. The theme of this slide is "Invite you to physics experiment and simulator".

1. 幸福のアジェンダ2015
幸福の物理 したろう
rogysemi7th

2. 内容
工大祭までに幸福の物理でやりたい
物理のネタを新入生に向けて紹介
 Einstein-de Haas Experiment
 Liquid Film Motor
 Random Close Packing
 Wilson-Wilson Experiment
 General Relativistic Mario Bros. 64
 Quantum Mario Bros.
 Chaotic Waterwheel
特にこれら３つを
具体的に解説

3. ネタの宝物庫
 arXiv.org
色々な論文がタダで読める
http://arxiv.org
 IYPT
部室で出来そうな実験のネタを毎年提供している
http://iypt.org

4. Einstein-de Haas Effect
Why does a metallic cylinder rotate?
Question
A metallic cylinder
A string suspends
a cylinder
A vertical
magnetic field
Fig:http://en.wikipedia.org/wiki/Einstein%E2%80%93de_Haas_effect

5. Einstein-de Haas Effect
𝜇 = −𝑔
𝑒
2𝑚
𝐽
The magnetic
momentum
The angular
momentum
The g-factor (gyromagnetic factor)
1:Due to the orbit
2:Due to the spin Experiment showed !
(Einstein-de Haas 1915)
Anglar momentum Magnetism
Conclusion
Macroscopic Microscopic

6. Liquid Film Motor
Why does a film rotate?
Question
A soap film
on a flat frame
Generate an electric field
parallel to the film surface
A Supply an electric current
through the film
Fig:http://iypt.org/images/8/87/problems2015.pdf

7. Liquid Film Motor
- An opportunity to study electrohydrodynamics
- A chance to practice programing and electric circuit
- Apply this motor to microscopic devices
Benefits
 E. V. Shiryaeva, V. A. Vladimirov, and M. Yu Zhukov. Rotating
electrohydrodynamic flow in a suspended liquid film. Phys. Rev. E 80, 4,
041603 (2009),arXiv:0902.3733v1 [physics.flu-dyn]
 R. Shirsavar, A. Amjadi, A. Tonddast-Navaei, and M. R. Ejtehadi. Electrically
rotating suspended films of polar liquids. Exp. Fluids, 50, 2, 419-428 (2011)
References

8. Random Close Packing
How do characteristics depend on
the relevant parameter?
Question
Non-spherical
particles
Pour particles
In a box
- Coordination number
- Orientational order
etc…
cf:Kepler conjecture
(math prob.)

9. Random Close Packing
- An opportunity to study powder
- A chance to make liquid(more precisely powder) simulator
- Be helpful to pack tublets, chocolate, powder, and so on
Benefits
 Ch. Song, P. Wang, and H. A. Makse. A phase diagram for jammed matter.
Nature 453, 629-632(2008), arXiv:0808.2196 [cond-mat.soft]
 A. Donev, R. Connelly, F. H. Stillinger, and S. Torquato. Hypoconstrained
jammed packings of nonspherical hard particles: Ellipses and Ellipsoids. Phys.
Rev. E 75, 051304 (2007),arXiv:cond-mat/0608334 [cond-mat.mtrl-sci]
References

10. Other Themes
 Einstein-de Haas Experiment
 Liquid Film Motor
 Random Close Packing
 Wilson-Wilson Experiment
 General Relativistic Mario Bros. 64
 Quantum Mario Bros.
 Chaotic Waterwheel
Theory of
Relativity
Quantum Mechanics
Nonlinear Chaos

11. References
 Quantum Mario Bros.
山下晃一 訳，入門 量子ダイナミクス(上) 時間依存の量子力学を中心に
(化学同人，2011)
 Wilson-Wilson Experiment
Charles T. Ridgely.Applying relativistic electrodynamics to a rotating material
medium.Am. J. Phys.,Vol.66,114(1998)
 Chaotic Waterwheel
Steven H. Strogatz.Nonlinear Dynamics And Chaos.[田中久陽，中尾裕也，千葉
逸人 訳，ストロガッツ非線形ダイナミクスとカオス(丸善出版，2015)]

12. まとめ
 工大祭に向けて
物理実験・シミュレータを完成させような
 ネタ大募集中、アイディア大歓迎
 Einstein-de Haas Experiment
 Liquid Film Motor
 Random Close Packing
 Wilson-Wilson Experiment
 General Relativistic Mario Bros. 64
 Quantum Mario Bros.
 Chaotic Waterwheel