AJP	ISSN : 0971 – 3093 Vol 27, No 4, April, 2018

Asian
Journal of Physics

Asian Journal of Physics

Vol. 27 No 4 (2018) 195-197

Albert Einstein :The Crusader of Peace and Justice
(On the occasion of  death Anniversary of Einstein)

                As the month of April approaches, many scientists across the world remember the passing of Albert Einstein, whose innocent  philosophical face remains etched in the mind. Both as a scientist and great humanist, Einstein did his utmost what he could do to make the world a better place to live in.
              Albert Einstein, one of the greatest scientists of his times once stated, “Politics is for the present, but an equation is something for eternity.” Considering Einstein was not only a crusader of world peace, freedom and of justice to persecuted races, but also a great original theorist whose theories revolutionized the understanding of the structure of the universe, he was invited to become the second President of Israel [1]. He declined the invitation, without thinking second time about the refusal. So, to the great physicist, politics was not a means to enjoying political power. As a scientist philosopher devoted to the humanist causes of his times, he had a deep sense of personal outrage at the shocking happenings and involved himself in people’s movement to create a free and just world. Einstein thus showed by both practice and precept that a scientist should not live in an ivory tower or an enclosed world.

Total Refs: 1

Albert Einstein:The Crusader of Peace and Justice.pdf

Albert Einstein:The Crusader of Peace and Justice. G L Gautam ‘Prabhat’ @ Asian Journal of Physics

 

 

Asian Journal of Physics

Vol. 27 No 4 (2018) 199-202

The beginning of the Albert Einstein’s contact with M N Saha and S N Bose

 

Albert Einstein (Fig 1) is one of the most famous physicists of the 20th century. His name is associated with the quantum nature of light and the theory of relativity. He communicated not only with India’s politician Mohandas Karamchand Gandhi, but also with Indian physicists S N Bose and M N Saha. Details of Einstein’s interaction with Indian scientists are explored in a separate article. In the following, I show how the interaction between Saha-Einstein and Bose-Einstein began.

The beginning of the Albert Einstein’s contact with M N Saha and S N Bose.pdf

Rajinder Singh

 

Asian Journal of Physics

Vol. 27 No 4 (2018) 203-215

A new approach to determine FLC₀ by bending test using stereo
digital image correlation method

 

Xin Xie^1,*, Keith Kowalkowski², Chukiang Fong-Ramirez¹and Kirtan Patel¹

¹A Leon Linton Department of Mechanical Engineering, Lawrence Technological University, Southfield, Michigan, 48075, USA

FLC₀ is one of the most critical material properties in material formability study. To determine the FLC₀ of newly developed materials, the ε₂ – ε₁ strain path under plane strain condition has to be measured. Conventionally, the plane strain condition is created by a punch test which is expensive, high material cost and time consuming. This paper introduces a new approach to create plane strain condition using a bending test on a tensile test machine. The full-field strain distribution on the test specimen is measured by stereo Digital Image Correlation (DIC) method. The true principal ε₂ – ε₁ strain path of the specimen is then created from the full field strain map measured by DIC method. By determining the onset necking failure timing using ISO12004 standard, the FLC₀ value can be determined from the ε₂ – ε₁ strain path. The fundamental of stereo Digital Image Correlation, methodology, experiment setup and data analysis are shown in detail in this article. © Anita Publications. All rights reserved.

Keywords: Forming Limit Curve (FLC) method, Digital image correlation (DIC) method, ε₂ – ε₁ strain paths, stereovision 3D reconstruction

 

Asian Journal of Physics

Vol. 27 No 4 (2018) 217-223

An all-optical sensing system based on fiber phase encoding and volume holography

 

Ching-Cherng Sun, Po-Kai Hsieh, Yi-Ming Chen, Yeh-Wei Yu, and Wei-Chia Su
Department of Optics and Photonics,

We proposed and discussed an all- optical system, where all actions including optical sensing, signal transmission, information processing, and display are all by optical means. The sensing is based on multi-mode fiber, where phase of each mode is a function of fiber bending. The incoherent phase change of each mode enables the outcoming light from the fiber to perform random phase encoding, which is useful in holographic multiplexing. Then a volume hologram serves as a data base to record the interconnection between a special random phase and an image. The random phase is generated by the lateral displacement of the rod attaching the fiber, and the image is designed to indicate the position of the rod. As a result, an all- optical system is performed with a sensing speed as fast as light velocity © Anita Publications. All rights reserved.

Keywords: Volume holography, Optical sensing, Signal transmission, Information processing,

References

  1.   Dangel R, Hofrichter J, Horst F, Jubin D, Porta A L, Meier N, Sogani I M, Weiss J,  Offrein B J, Polymer waveguides for electro-optical integration in data  centers and high-performance computers, Opt Express,  23(2015) 4736-4750.

  2.   Miller D A B, Rationale and challenges for optical interconnects to electronic chips, Proc IEEE, 88(2000)728-749.

  3.   Lowery A J, Design of arrayed-waveguide grating routers for use as optical OFDM demultiplexers, Opt Express,  18 (2010)14129-14143.

  4.   Lee H, Jin S K, Experimental study of volume holographic interconnects using random patterns, Appl Phys Lett,  62(1993)2191-2193.

  5.   Sun C C, Teng T C,  Y W, One-dimensional optical imaging with a volume holographic optical element, Opt Lett,  30(2005)1132-1134.

  6.   Sun C C, Chen Y M,  Su W C, An all-optical fiber sensing system based on random phase encoding and volume holographic interconnection, Opt Eng, 40(2001)160-162.

  7.   Teng T C, Ou P C, Sun C C, Volume holographic optical elements for point-to-point imaging with local cross talk, Opt Lett, 30(2005)3015-3017.

  8.   Sun C C,  Banerjee P P, Volume holographic optical elements, Opt Eng, 43(2004)1957-1959.

  9.   Su W C, Sun C C, Optical pattern interconnections using random phase encoding in volume holograms, Opt Commun, 213(2002)259-265.

10.   Teng T C, Yu Y W,  Sun C C, Enlarging multiplexing capacity with reduced radial cross talk in volume holographic discs, Opt Express, 14(2006)3187-3192.

11.   Heerden P J van, Theory of optical information storage in solids, Appl Opt, 2(1963)393-400.

12.   Sun C C, Yu Y W, Hsieh S, T C, Tsai M F, Point spread function of a collinear holographic storage system, Opt Express, 15(2007)18111-18118.

13.   Yu Y W, Teng T C,  Hsieh S C,  Cheng C Y, Sun C C, Shifting selectivity of collinear volume holographic storage, Opt Commun, 283(2010)3895-3900.

14.   Yu Y W, Xiao S, Cheng C Y, Sun C C, One-shot and aberration-tolerable homodyne detection for holographic storage readout through double-frequency grating-based lateral shearing interferometry, Opt Express, 24(2016)10412-10423.

15.   Yu Y W, Yang C H, Yang T H, Lin S H,  Sun C C, Analysis of a lens-array modulated coaxial holographic data storage system with considering recording dynamics of material, Opt Express, 25(2017)22947-22958.

16.   Leith E N, Kozma A, Marks J, Massey N, Holographic data storage in three-dimensional media, Appl Opt,  5(1966)1303-1311.

17.   Burr G W, Mok F H, Psaltis D, Angle and space multiplexed storage using the 90ogeometry, Opt Commun,  117(1995)49-55.

18.   Bashaw M C, Heanue J F,  Aharoni A, Walkup J F, Hesselink L, Cross-talk considerations for angular and phase-encoded multiplexing in volume holography,J Opt Soc Am B, 11(1994)1820-1836.

19.   Denz C, Pauliat G, Roosen G, Volume hologram multiplexing using a deterministic phase encoding method, Opt Commun, 85(1991)171-176.

20.   Heanue J F, Bashaw M C, Hesselink L, Encrypted holographic data storage based on orthogonal phase-code multiplexing, Appl Opt, 34(1995)6012-6015.

21.   LaMacchia J T, White D L, Coded multiple exposure holograms, Appl Opt, 7(1968)91-94.

22.   Sun C C, Tsou R H, Chang W, Chang J Y,  Chang M W,  Random phase-coded multiplexing in LiNbO₃ for volume hologram storage by using a ground-glass,Opt Quantum Electron, 28(1996)1509-1520.

23.   Sun C C, Su W C, Three-dimensional shifting selectivity of random phase encoding in volume holograms, Appl Opt, 40(2001)1253-1260.

24.   Yu Y W, Cheng C Y, Hsieh S C, Teng T C,  Sun C C, Point spread function by random phase reference in collinear holographic storage, Opt  Eng, 48(2009)020501; doi:10.1117/1.3080725

25.   Rakuljic G A, Levya V,  Yariv A, Optical data storage by using orthogonal wavelength-multiplexed volume holograms, Opt Lett, 17(1992)1471-1473.

26.   Yin S, Zhou H, Zhao F, Wen M, Zang Y,  Zhang J, Yu F T S, Wavelength-multiplexed holographic storage in a sensitive photorefractive crystal using a visible-light tunable diode-laser, Opt Commun, 101(1993)317-321.

27.   Sun C C, Hsu C Y, Ouyang Y, Su W C, Chiou A E T, All-optical Angular Sensing based on Holography Multiplexing with Spherical Waves, Opt Eng,41(2002)2809-2813. 

28.   Yu Y W, Chen C Y, Sun C C, Increase of signal-to-noise ratio of a collinear holographic storage system with reference modulated by a ring lens array, Opt Lett, 35(2010)1130-1132.

29.   Sun C C, Tsou R H, Chang W, Chang J Y, Random phase-coded multiplexing of hologram volumes using ground glass, Optical and Quantum Electronics, 28(1996)1551-1561.  

30.   Sun C C, Su W C, Wang B, Chiou A E T, Lateral shifting sensitivity of a ground glass for holographic encryption and multiplexing using phase conjugate readout algorithm, Opt Commun, 191(2001)209-224.

31.   Wang B, Sun C C, Su W C, AET Chiou A E T, Shift-tolerance property of an optical double-random phase-encoding encryption system, Appl Opt, 39(2000)4788-4793.

32.   Sun C C, Su W C,  Wang B, Yang Y O, Diffraction selectivity of holograms with random phase encoding, Opt Commun, 75(2000)67-74.

33.   Wu S, Yin S, Yu F T S, Sensing with fiber specklegrams, Appl Opt, 30(1991)4468-4470.

34.   Yu F T S,  Yin S, Zhang  J, Guo R, Application of a fiber-speckle hologram to fiber sensing, Appl Opt, 33(1994) 5202-5203.

35.    Yin S, Purwosumarto P, Yu F T S, Application of fiber specklergram sensor to fine angular alignment, Opt Commun, 170(1999)15-21.

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