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Search Results: 1 - 10 of 61361 matches for " SUN Kai-Ming "
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Vortices on Higher Genus Surfaces
Kai-Ming Lee
Physics , 1993, DOI: 10.1103/PhysRevD.49.2030
Abstract: We consider the topological interactions of vortices on general surfaces. If the genus of the surface is greater than zero, the handles can carry magnetic flux. The classical state of the vortices and the handles can be described by a mapping from the fundamental group to the unbroken gauge group. The allowed configurations must satisfy a relation induced by the fundamental group. Upon quantization, the handles can carry ``Cheshire charge.'' The motion of the vortices can be described by the braid group of the surface. How the motion of the vortices affects the state is analyzed in detail.
Nature of the Insulating Ground State of the 5d PostPerovskite CaIrO3
Sun-Woo Kim,Chen Liu,Hyun-Jung Kim,Jun-Ho Lee,Yongxin Yao,Kai-Ming Ho,Jun-Hyung Cho
Physics , 2015, DOI: 10.1103/PhysRevLett.115.096401
Abstract: The insulating ground state of the 5d transition metal oxide CaIrO3 has been classified as a Mott-type insulator. Based on a systematic density functional theory (DFT) study with local, semilocal, and hybrid exchange-correlation functionals, we reveal that the Ir t2g states exhibit large splittings and one-dimensional electronic states along the c axis due to a tetragonal crystal field. Our hybrid DFT calculation adequately describes the antiferromagnetic (AFM) order along the c direction via a superexchange interaction between Ir4+ spins. Furthermore, the spin-orbit coupling (SOC) hybridizes the t2g states to open an insulating gap. These results indicate that CaIrO3 can be represented as a spin-orbit Slater insulator, driven by the interplay between a long-range AFM order and the SOC. Such a Slater mechanism for the gap formation is also demonstrated by the DFT + dynamical mean field theory calculation, where the metal-insulator transition and the paramagnetic to AFM phase transition are concomitant with each other.
Crystalline 'Genes' in Metallic Liquids
Yang Sun,Feng Zhang,Zhuo Ye,Xiaowei Fang,Zejun Ding,Cai-Zhuang Wang,Mikhail I. Mendelev,Ryan T. Ott,M. J. Kramer,Kai-Ming Ho
Physics , 2014,
Abstract: The underlying structural order that transcends the liquid, glass and crystalline states is identified using an efficient genetic algorithm (GA). GA identifies the most common energetically favorable packing motif in crystalline structures close to the alloy's Al-10 at.% Sm composition. These motifs are in turn compared to the observed packing motifs in the actual liquid structures using a cluster-alignment method which reveals the average topology. Conventional descriptions of the short-range order, such as Voronoi tessellation, are too rigid in their analysis of the configurational poly-types when describing the chemical and topological ordering during transition from undercooled metallic liquids to crystalline phases or glass. Our approach here brings new insight into describing mesoscopic order-disorder transitions in condensed matter physics.
A SMARTT future for sports medicine
Kai-Ming Chan, Masahiro Kurosaka
Sports Medicine, Arthroscopy, Rehabilitation, Therapy & Technology , 2009, DOI: 10.1186/1758-2555-1-1
Abstract: With an expert Editorial team [1], we shall present quality research that reaches a wide readership amongst professionals working in different disciplines. By bringing together research from the fields of sports medicine, arthroscopy, rehabilitation, therapy and technology, which may previously have been found in a range of journals, we hope to provide a single home for the cross-fertilization of ideas. We also aim to promote collaboration amongst academic institutions, industrial and corporate research facilities to support integration for new technology and clinical applications.SMARTT is the official journal of the Asia Pacific Orthopaedic Society for Sports Medicine (APOSSM) and is affiliated with the Japanese Orthopaedic Society for Knee Surgery Arthroscopy And Sports Medicine (JOSKAS) and five other societies. We hope that these strong links and support from authors will help to inspire clinicians, practitioners, scientists and engineers to work towards a common goal to improve the quality of life in the international community.In order to cover all of the essential topics in disciplines related to the journal, SMARTT will consider manuscripts on sports science, exercise physiology, sports nutrition, sports psychology, sports medicine, arthroscopic surgery, sports, orthopaedic and computational biomechanics, manual therapy, physical therapy, musculoskeletal rehabilitation, biomedical devices and technology and sports equipment technology. The SMARTT 'About' page [2] contains further information regarding the journal scope.Timely publication and high visibility are two important features of this journal that makes it different from other traditional journals. Being an open access journal ensures rapid and efficient communication of research findings for the benefits of science, medicine and the general public. Authors can be assured their work is disseminated to the widest possible audience. The copyright belongs to the authors and they grant anyone the right t


系统科学与数学 , 1995,
Abstract: in this paper, irreducible and indecomposable Harish-Chandramodules, over sl2(R) are completely classified. The results for sl2(R) are differentfrom those for sl2(C). As an application, a new class of irreducible modules over thereal Virasoro algebra is constructed.
Virasoro 代数的自同构和自同态


系统科学与数学 , 1992,
Abstract: In this paper,automorphisms and homomorphisms of the Virasoro algebra are completelydetermined.In addition,three-dimrnsional simple subalgebras of the Virasoro algebra arethroughly studied.


系统科学与数学 , 1994,
Abstract: Virasoro代数同构的不可约表示赵开明(中国科学院系统科学研究所,北京100080)1990年12月4日收到,1993年4月28日收到修改稿.Virasoro代数的表示理论在数学和物理的许多分支中起着重要的作用,例如在仿射Lie代数理论[1,2]...
Topologically Massive Gauge Theory with O(2) Symmetry
Ian I. Kogan,Kai-Ming Lee
Physics , 1995, DOI: 10.1016/0370-2693(95)01424-1
Abstract: We discuss the structure of the vacua in $O(2)$ topologically massive gauge theory on a torus. Since $O(2)$ has two connected components, there are four classical vacua. The different vacua impose different boundary conditions on the gauge potentials. We also discuss the non-perturbative transitions between the vacua induced by vortices of the theory.
The Formation of Precipitation Anomaly Patterns during the Developing and Decaying Phases of ENSO
El Nino发展和衰弱期降水距平场的形成

HU Kai-Ming,HUANG Gang,
HU Kai-Ming

大气和海洋科学快报 , 2010,
Abstract: This study proposes a new explanation for the formation of precipitation anomaly patterns in the boreal summer during the El Nino-Southern Oscillation (ENSO) developing and decaying phases. During the boreal summer June-July-August (JJA) (0) of the El Nino (La Nina) developing phase, the upper level (300-100 hPa) positive potential temperature anomalies resemble a Matsuno-Gill-type response to central Pacific heating (cooling), and the lower level (1000-850 hPa) potential temperature anomalies are consistent with local SST anomalies. During the boreal summer JJA(1) of the El Ni o (La Nina) decaying phase, the upper level potential temperature warms over the entire tropical zone and resembles a Matsuno-Gill-type response to Indian Ocean heating (cooling), and the lower level potential temperature anomalies follow local SST anomalies. The vertical heterogeneity of potential temperature anomalies influences the atmospheric stability, which in turn influences the precipitation anomaly pattern. The results of numerical experiments confirm our observations.
The Oscillation between Tropical Indian Ocean and North Pacific:Evidence and Possible Impact on Winter Climate in China
The Oscillation between Tropical Indian Ocean and North Pacific: Evidence and Possible Impact on Winter Climate in China

HU Kai-Ming,HUANG Gang,
HU Kai-Ming

大气和海洋科学快报 , 2011,
Abstract: This paper provides evidence that the variation of boreal winter sea level pressure (SLP) over the North Pacific is out-of-phase with SLP fluctuation over the tropical Indian Ocean on both the interdecadal and interannual time scales. Subsequently, a SLP between tropical Indian Ocean and North Pacific (TIO-NP) oscillation index is defined to indicate the variation of such out-of-phase fluctuation. Moreover, the simultaneous surface air temperature and precipitation anomalies in China are closely related to TIO-NP oscillations. Below-normal surface air temperature anomalies in the northern and the eastern part of China, and less rainfall in southern China, correspond to positive TIO-NP oscillation phase with negative SLP anomalies in tropical Indian Ocean and positive anomalies in North Pacific. The TIO-NP oscillation affects China’s winter climate anomalies, possibly through modulating the northeast East Asia winter monsoon.
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