10,113 research outputs found
Sheldon Hsiao-peng Lu. Transnational Chinese cinemas : identity, nationhood, gender
This article reviews the book Transnational Chinese Cinemas: Identity, Nationhood, Gender edited by Sheldon Hsiao-peng Lu
Landau theory of charge and spin ordering in the nickelates
Guided by experiment and band structure, we introduce and study a
phenomenological Landau theory for the unusual charge and spin ordering
associated with the Mott transition in the perovskite nickelates, with chemical
formula RNiO, where R=Pr, Nd, Sm, Eu, Ho, Y, and Lu. While the Landau
theory has general applicability, we show that for the most conducting
materials, R=Pr, Nd, both types of order can be understood in terms of a
nearly-nested spin density wave. Furthermore, we argue that in this regime, the
charge ordering is reliant upon the orthorhombic symmetry of the sample, and
therefore proportional to the magnitude of the orthorhombic distortion. The
first order nature of the phase transitions is also explained. We briefly show
by example how the theory is readily adapted to modified geometries such as
nickelate films.Comment: 4 pages, 3 figure
Wave dynamics of a six-dimensional black hole localized on a tensional three-brane
We study the quasinormal modes and the late-time tail behavior of scalar
perturbation in the background of a black hole localized on a tensional
three-brane in a world with two large extra dimensions. We find that finite
brane tension modifies the standard results in the wave dynamics for the case
of a black hole on a brane with completely negligible tension. We argue that
the wave dynamics contains the imprint of the extra dimensions.Comment: revised version, 10 pages, 1 table and 2 figures. Accepted for
publication in Phys. Lett.
Improved Successive Cancellation Decoding of Polar Codes
As improved versions of successive cancellation (SC) decoding algorithm,
successive cancellation list (SCL) decoding and successive cancellation stack
(SCS) decoding are used to improve the finite-length performance of polar
codes. Unified descriptions of SC, SCL and SCS decoding algorithms are given as
path searching procedures on the code tree of polar codes. Combining the ideas
of SCL and SCS, a new decoding algorithm named successive cancellation hybrid
(SCH) is proposed, which can achieve a better trade-off between computational
complexity and space complexity. Further, to reduce the complexity, a pruning
technique is proposed to avoid unnecessary path searching operations.
Performance and complexity analysis based on simulations show that, with proper
configurations, all the three improved successive cancellation (ISC) decoding
algorithms can have a performance very close to that of maximum-likelihood (ML)
decoding with acceptable complexity. Moreover, with the help of the proposed
pruning technique, the complexities of ISC decoders can be very close to that
of SC decoder in the moderate and high signal-to-noise ratio (SNR) regime.Comment: This paper is modified and submitted to IEEE Transactions on
Communication
Energy pathways and structures of oceanic eddies from the ECCO2 state estimate and simplified models
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution February 2013Studying oceanic eddies is important for understanding and predicting ocean circulation
and climate variability. The central focus of this dissertation is the energy
exchange between eddies and mean flow and banded structures in the low-frequency
component of the eddy field. A combination of a realistic eddy-permitting ocean
state estimate and simplified theoretical models is used to address the following specific questions. (1) What are the major spatial characteristics of eddy-mean
flow interaction from an energy perspective? Is eddy-mean flow interaction a local process
in most ocean regions? (2) The banded structures in the low-frequency eddy field are
termed striations. How much oceanic variability is associated with striations? How
does the time-mean circulation, for example a subtropical gyre or constant mean
flow, influence the origin and characteristics of striations? How much do striations
contribute to the energy budget and tracer mixing?This research was supported by the National Aeronautics and Space Administration
contracts NNX09AI87G and NNX08AR33G
高度増殖性を示す膵臓癌細胞が持つ幹細胞特性のトランスクリプトーム解析による同定
付記する学位プログラム名: 充実した健康長寿社会を築く総合医療開発リーダー育成プログラム京都大学0048新制・課程博士博士(医科学)甲第22747号医科博第116号新制||医科||8(附属図書館)京都大学大学院医学研究科医科学専攻(主査)教授 長船 健二, 教授 武藤 学, 教授 小川 誠司学位規則第4条第1項該当Doctor of Medical ScienceKyoto UniversityDFA
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