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RISS 인기검색어
- 검색키워드
- 저자 : EASSON, DAMIEN A. (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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EASSON, DAMIEN A.,FRAMPTON, PAUL H.,SMOOT, GEORGE F. World Scientific 2012 International journal of modern physics. A, Partic Vol.27 No.12
<P> One of the major pillars of modern cosmology theory is a period of accelerating expansion in the early universe. This accelerating expansion, or inflation, must be sustained for at least 30 e-foldings. One mechanism used to drive the acceleration is the addition of a new energy field, called the inflaton; often this is a scalar field. We propose an alternative mechanism which, like our approach to explain the late-time accelerating universe, uses the entropy and temperature intrinsic to information holographically stored on a surface enclosing the observed space. The acceleration is due in both cases to an emergent entropic force, naturally arising from the information storage on the horizon. </P>
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Entropic accelerating universe
Easson, D.A.,Frampton, P.H.,Smoot, G.F. North-Holland Pub. Co 2011 Physics letters: B Vol.696 No.3
To accommodate the observed accelerated expansion of the universe, one popular idea is to invoke a driving term in the Friedmann-Lemaitre equation of dark energy which must then comprise 70% of the present cosmological energy density. We propose an alternative interpretation which takes into account the entropy and temperature intrinsic to the horizon of the universe due to the information holographically stored there. Dark energy is thereby obviated and the acceleration is due to an entropic force naturally arising from the information storage on the horizon surface screen. We consider an additional quantitative approach inspired by surface terms in general relativity and show that this leads to the entropic accelerating universe.
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세포외 다당류 생산을 위한 Zoogloea ramigera 115 균주의 개량
임무현,D. Davidson Easson Jr,Anthony J. Sinskey 대구대학교 산업기술연구소 1989 産業技術硏究 Vol.8 No.-
세포의 다당류의 생산능이 우수한 균주를 Zoogloea ramigera 115로부터 변이 처리하여 선발하였다. Z. ramigera 115균이 Capsule을 형성하여 floc을 만드는데 반하여 이 균은 slime층을 형성하여 용액중에 잘풀리는 다당류를 생산하는 특징을 보여주었으며, Z. ramigera115 SL로 명명하였다. 따라서 이균은 배양적 성질이 모균인 Z. ramigera에 비하여 세포외 다당의 분리가 용이하게 개량되었고 모균에 비하여 약 20%의 생산성의 향상을 나타내었다. 이들 두 균주가 생산하는 다당의 구성분석에서 glucose와 galactose의 구성비가 약 2:1로 모두 동일하게 나타났으며 Z. ramigera 115 SL의 경우 Pyruvate와 D-acetyl group의 함량이 모균주보다 약간 높은 수치를 보였다.
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Raman Scattering Study of the Lattice Dynamic of URu2Si2and Sample’s Preparation
Jonathan Buhot,Marie-Aude M´easson,Yann Gallais,Maximilien Cazayous,Alain Sacuto,G´erard Lapertot,Dai Aoki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
We report Raman scattering measurements on URu2Si2 single crystals as a function of temperature down to 2 K. We probe all the Raman active symmetries. Only when the sample is prepared with a surface perpendicular to a-axis, we observe an extrinsic hardening and broadening of the A1g and B1g phonons after polishing, which disappears after annealing. Moreover, a parasitic phase with Si-excess compared to URu2Si2 composition appears on the a-axis surface when annealing is at 1075 ◦C. No parasitic phase is induced when annealing is done at 950 ◦C. The temperature dependance of the A1g, and two Eg phonons shows a hardening with decreasing temperature. The B1g phonon mode’s behavior is more unusual, its energy stays stable down to ∼ 30 K before softens at lower temperature. An electron-phonon coupling is certainly at play here.
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Experimental investigation of particle distribution in a flow through a stenosed artery
Anis Shuib,Peter Hoskins,William Easson 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.2
The particle distribution of a dilute solid-liquid suspension through a stenosed arterial geometry was investigated. Particle image velocimetry (PIV) was used to determine the velocity as well as to acquire the flow images. The light intensity scattered by particles was evaluated to determine the particle distribution. Flow separation exists where the flow emerges from the stenosis throat. From the PIV images, the particle density distribution exhibited differing non-uniform characteristics which vary with flow rate, particle size and particle concentration. At low flow rates, a particle-free layer is formed. As the flow rate is increased, particles accumulate in concentric recirculation orbits within the downstream vortex. Particles with larger size and higher concentration tend to accumulate more towards the center of the vortex.
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