Vol 27 No 4

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)

G L Gautam ‘Prabhat’
L R College, Sahibabad-20 1 005, India

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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

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

Rajinder Singh
University of Oldenburg, Faculty V - Institute of Physics, Research Group on Physics Education,
History and Philosophy of Science, PO Box 2503, D-26111 Oldenburg, Germany.

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.

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

²Department of Civiland Architectural Engineering, Lawrence Technological University, Southfield, Michigan, 48075, USA

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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

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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,

National Central University, Chung-Li 320, Taiwan

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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,

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ASIAN JOURNAL OF PHYSICS