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Vorticity dynamics, drift wave turbulence, and zonal flows: a look back and a look ahead
Diamond, P H,Hasegawa, A,Mima, K Published jointly by The Institute of Physics and 2011 Plasma physics and controlled fusion Vol.53 No.12
<P>This paper surveys the basic ideas and results on fundamental models of drift wave turbulence, the formation of zonal flows, shear suppression of turbulence and transport, coupled drift wave and zonal flow dynamics and application to transport bifurcations and transitions. Application to vortex dynamics and zonal flow phenomena in EMHD systems are discussed, as well. These are relevant to aspects of ICF and laser plasma physics. Throughout, an effort is made to focus on fundamental physics ideas.</P>
New design approaches of reversible BCD encoder using Peres and Feynman gates
Sheba Diamond Thabah,Prabir Saha 한국통신학회 2020 ICT Express Vol.6 No.1
This paper proposes two new design approaches for decimal to binary-coded-decimal (BCD) encoder using reversible logic through Peres gate (PG) and Feynman gate (FG) which consume 10 and 11 gates respectively to realize such circuitry. Gates have been arranged properly to minimize the gate count (GC) followed by the reduction of the quantum cost (QC) and garbage outputs (GO). The proposed designs have an improvement at least up to 45%, 40%, and 50% of GC, GO and QC respectively from the best state of the art designs.
Dying with Eyes Open or Closed: The Debate over a Chinese Aircraft Carrier
( Andrew F Diamond ) 한국국방연구원 2006 The Korean Journal of Defense Analysis Vol.18 No.1
There is a debate currently going on inside China over the potential benefits and drawbacks to the long-standing Chinese dream of possessing an aircraft carrier. Proponents of a Chinese aircraft carrier-achieved either through foreign procurement or indigenous production-point to such an acquisition as both ensuring China`s ability to defend its territories from foreign aggressors and confirming its status as a global power. They also argue that possession of an aircraft carrier would help secure key sea lines of communication (SLOCs) vital to China`s energy security and trade, while boosting national pride. However, these arguments are rooted more in nationalism than pragmatism, as a Chinese aircraft carrier would negatively impact China`s security environment in a number of ways. Such a development would no doubt have widespread geopolitical consequences, giving credence to the "China threat" abroad, and increasing tension in Sino-ASEAN and Sino-U.S. relations. Such tension would damage Beijing`s ability to rely on regional support to rein in potential Taiwanese moves toward independence. Additionally, the astronomical cost of such a program would siphon-off key, limited resources that could be better spent, from the Chinese perspective, on other programs of greater immediate necessity. There are also serious questions regarding China`s technical ability to build and maintain many of the necessary components and subsystems vital to an aircraft carrier and its defense. Despite this, the debate is far from over, and will most likely continue to unfold over the next decade as China accelerates its naval modernization and extends its gaze to the far horizons. The outcome of this debate has the potential to signal China`s future maritime strategy, with implications for the immediate region, the United States, and the world.
How does drift wave turbulence convert parallel compression into perpendicular flows?
Wang, Lu,Diamond, P H,Hahm, T S Published jointly by The Institute of Physics and 2012 Plasma physics and controlled fusion Vol.54 No.9
<P>Zonal flow (ZF) momentum balance in a three-dimensional, coupled drift-ion acoustic wave system is examined. In a three-dimensional system, conservation of potential vorticity (PV) is broken by fluctuating parallel flow compressibility. The coupling between PV fluctuation and fluctuating parallel flow compression defines a source/sink for fluctuating potential enstrophy density, and thus influences the wave momentum density and modifies the zonal momentum theorem. We show that perpendicular ZFs can be excited by stationary turbulence via compressional coupling, even in the absence of a driving force and potential enstrophy flux. The coupling drive involves both perpendicular and parallel dynamics, and does not require symmetry breaking in the turbulence spectrum. A new mechanism for ZF generation is thus revealed.</P>