Comment on “Foam imbibition in microgravity. An experimental study” by H. Caps,H. Decauwer,M.-L. Chevalier,G. Soyez,M. Ausloos and N. Vandewalle

In a recent paper, [1] described parabolic flight experiments showing the movement of liquid into the foam during the microgravity phase. In this comment, we present a detailed theory of this process, supported by numerical calculations, confirming their conclusion that the wetting front moves with the square root of time. We further show that this diffusion process is similar for different surfactant systems, which allows us to provide bounds on the value of the diffusion coefficient.Received: 28 April 2004, Published online: 3 August 2004PACS: 82.70.Rr Aerosols and foams - 83.80.Iz Emulsions and foams     

Ultracold Gases and Quantum Information: Lecture Notes of the Les Houches Summer School in Singapore,edited by C. Miniatura,L-C. Kwek,M. Ducloy,B. Grémaud,B-G. Englert,L.F. Cugliandolo,A. Ekert and K. K. Phua

Measurements of the Faraday magneto-optical effect and of optical absorption in magnetic garnet crystals and films are reviewed. Earlier work was restricted to measurements in the visible spectrum; these measurements showed that the transparency was sufficient to allow magnetic domains to be studied in relatively thick slabs. Within the last year or so interest has been renewed in extending magneto-optical measurements beyond the visible spectrum. In particular, extremely low absorptions are found in the wavelength range of approximately 1–5 microns. Thie work is, in no small way, spurred by the possibility of developing a light-beam modulator using the Faraday effect in this wavelength range. Recent measurements at very short wavelengths using garnet films are also reported. By extending the short wavelength measurements to 3000 Å, about two orders of magnitude increase in Fareday rotation and optical absorption are observed, compared with the visible spectrum measurements.

The Faraday effect has been used to measure magnetic hysteresis loops in single-crystal garnet slabs. Magneto-optical observation of the corresponding domain structures shows them to be particularly simple. Detailed correlation of domain structure and hysteresis loops is described; in addition, an estimate of the domain wall energy and its width is made from these measurements.

The garnets referred to in this review are yttrium iron garnet (YIG), gadolinium iron garnet (GdIG), and YIG doped with gallium (YGaIG).     

TOTAL CONTENTS,Vol.30,No.1─12,2001

ＳｕｂｊｅｃｔＷｒｉｔｅｒＮｏ ｐ ＳｐｅｃｉａｌＩｓｓｕｅｉｎＣｏｍｍｅｍｏｒａｔｉｏｎｏｆｔｈｅ 1 0 0ｔｈＡｎｎｉｖｅｒｓａｒｙｏｆｔｈｅＢｉｒｔｈｏｆＱｕａｎｔｕｍＭｅｃｈａｎｉｃｓＲｅｔｒｏｓｐｅｃｔａｎｄＨｉｎｄｓｉｇｈｔＨｉｓｔｏｒｙａｎｄＦｕｔｕｒｅ———ＩｎＣｏｍｍｅｍｏｒａｔｉｏｎｏｆＱｕａｎｔｕｍＴｈｅｏｒｙ′ｓＣｅｎｔｅｎａｒｙ ＺＨＯＵＧｕａｎｇ Ｚｈａｏ……………………… 5 ( 2 5 9)ＴｈｅＢｉｒｔｈａｎｄＧｒｏｗｔｈｏｆＱｕａｎｔｕｍＴｈｅｏｒｙ———ＦｒｏｍＱｕａｎｔｕｍ…     

亨利,卡文迪什,约翰.冯.索尔特纳和光线的偏转

大约在1784年,亨利·卡文迪什就已经在牛顿理论和光的粒子模型的基础上计算了光线的引力偏转,但他从未发表过自己的这一计算.他比冯·索尔特纳 (Johann Georg von So-ldner)首次发表的计算几乎早20年.他们两人的结果略有差别,这是因为卡文迪什讨论从无限远处发射的光,而索尔特纳则讨论从引力物体表面发出的光.在第一级近似时,他们的结果相互一致,都是广义相对论所预言并由实验证实的数值的一半. 当提起引力物体引起光线偏转这一概念时,通常就会想到爱因斯坦的名字,因为他在1915年11月曾利用广义相对论计算并预言了现在为大家所公认为正确…     

Commentary on “Mechanical properties of monodomain side-chain nematic elastomers” by P. Martinoty,P. Stein,H. Finkelmann,H. Pleiner and H.R. Brand

We discuss the background to static and dynamic soft elasticity. The evidence in the static case and the symmetry basis for soft and semi-soft elasticity is well understood. By contrast the dynamic analogy is less clear. Lack of clean time scale separation clouds the interpretation of director relaxation keeping up, or not, with imposed strains. However, the reduction in modulus between geometries obtaining at low frequencies and being lost at high frequencies confirms that director reaction indeed determines dynamical semi-softness.Received: 13 April 2004, Published online: 17 August 2004PACS: 83.80.Va Elastomeric polymers - 61.30.-v Liquid crystals - 83.60.Bc Linear viscoelasticity     

Н.Н.Боголюбов,И.М.Лифшиц研究工作的简单介绍

由於本人对於金属物理所知极少,对於苏联科学家在此方面的工作亦未尝仔细学习,所以下面的简单介绍极不全面,并且也可能带有错误,乞大家指正。 报告分三部分,一为的二次量子化的近似理论[附带介绍他在处理简并(degenerate)系统的微擾论时所用的方法],一为他的一篇关於超导理论的论文的大体内容,一为研究金属在磁场下的性质的工作的一些情形。最末一部分还将由高联佩同志作补充报告。     

Large Deviations, Guerra’s and A.S.S. Schemes, and the Parisi Hypothesis

We investigate the problem of computing $$\lim_{N \to \infty}\frac{1}{aN}\log EZ_N^a$$ for any value of a, where Z _N is the partition function of the celebrated Sherrington-Kirkpatrick (SK) model, or of some of its natural generalizations. This is a natural “large deviation” problem. Its study helps to get a fresh look at some of the recent ideas introduced in the area, and raises a number of natural questions. We provide a complete solution for a ≥ 0.     

WULI(Physics, Monthly)TOTAL CONTENTS,Vol.ll,No.1-l2,l982

SubieCt Writer No. p.No nIinear Optica and SpeCtro5copy -...............'.......-.....- .-........-.........'...' N. Blotmberyen 7 (385)SpeCtroscopy in a New Light -'.........--.'...-...-......-- ..---.--.--....--.-..-...-.' Arthuf L. SchandoW 9 (5l3)AnowIedge ed Progres.Demonstration of Spinor Character of Spin--1 /2 Nucleus via Magnetic Resonance Method -.....-.-.-...............--..-....--.....-..-..--'-'-- Ye Chaohui, Zhn Xiwen l (l )Microwave Parameters for PoIycrystaIline F…