作者：
H. C. LeeZ. Y. ZhuTheoretical Physics Branch
Chalk River Laboratories Atomic Energy of Canada Limited Research Chalk River Ontario Canada K0J 1J0 Department of Applied Mathematics University of Western Ontario London Ontario Canada N6A 5B9 Chinese Center of Advanced Science and Technology (World Laboratory) P. O. Box 8730 Beijing 100080 China and Institute of Theoretical Physics Academia Sinica P. O. Box 2735 Beijing 100080 China
It is shown that, in a non-Abelian quantum field theory without an anomaly and broken symmetry, the set of all matrix-valued quantum holonomies Ψ[γ]≡〈Pexp(i∮∫γAdx)〉 for closed contours γ form a commutative se...
It is shown that, in a non-Abelian quantum field theory without an anomaly and broken symmetry, the set of all matrix-valued quantum holonomies Ψ[γ]≡〈Pexp(i∮∫γAdx)〉 for closed contours γ form a commutative semigroup, whereas 〈Pexp(i∫αAdx)〉=0 for every open path α. The eigenvalues Φ[γ] of Ψ[γ] are classified according to the irreducible representations of the gauge group. In an irreducible representation ρ, Tr(Ψ[γ])=Φ[γ]Tr(1ρ) is a Wilson loop. This equation solves a puzzle in the relation between link invariants and Wilson loops in the Chern-Simons theory in three dimensions when the gauge group is SU(N|N), and provides useful insight in understanding nonperturbative quantum chromodynamics as a string theory.
Simulations of field-ion-microscope images for the icosahedral phase of Al-Mn, based on new structural models, are presented and compared to the experimentally observed image features. Closest agreement thus far is fo...
Simulations of field-ion-microscope images for the icosahedral phase of Al-Mn, based on new structural models, are presented and compared to the experimentally observed image features. Closest agreement thus far is found for a cubic model having a 3·32 nm unit cell edge and containing a MacKay-icosahedron inner motif, with all of the manganese sublattice and only some of the aluminum atoms contributing to the computed images. An octahedral-motif decoration of a perfect three-dimensional Penrose tiling has also been constructed for comparison.
作者：
CRANE, RMMACANDER, ABRoger M. Crane:isa materials engineer in the Ship Materials Engineering Department of the David W. Taylor Naval Ship Research and Development Center (DTNSRDC)
Annapolis Md. He is presently involved in the development of fiber reinforced advanced composite materials for various naval applications. He received his B.S. degree in physics/engineering and his B.A. degree in mathematics: physical applications from Loyola College. He has finished his course work for his M.S. degree in materials science at the University of Delaware and is currently enrolled at the Johns Hopkins University. Mr. Crane is a member of Society of Experimental Stress Analysis and the Society of Physics Students. Aleksander B. Macander:is a materials engineer in the Ship Materials Engineering Department
DTNSRDC Annapolis Md. He is presently involved in the development of fiber reinforced advanced composite materials for various naval applications. Prior to joining DTNSRDC in 1973 he was associated with the Johns-Manville Corporation Denver Colo and also with the Naval Applied Science Laboratory Brooklyn N.Y. He received his B.S. degree in mechanical engineering from Fairleigh Dickinson University and his M.S. degree in mechanical engineering (plastics) from Stevens Institute of Technology. Mr. Macander is a member of ASTM the Severn Technical Society and the International Organization for Standardization/Technical Committee 61 on Plastics.
There are a limited number of nondestructive techniques available for field inspection of large composite structures and practically none for inservice inspection. An innovative damage assessment system is proposed wh...
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There are a limited number of nondestructive techniques available for field inspection of large composite structures and practically none for inservice inspection. An innovative damage assessment system is proposed which uses an optical fiber mesh implanted into the body of a fiber reinforced composite structure. This mesh would become an integral part of the structure on fabrication. The selection of the mesh fibers would be predicated on their strain to failure characteristics and strain compatibility with the base composite reinforcing fibers. This optical system will be capable of locating damage, assessing severity and monitoring damage growth. A successful implementation of the total damage assessment system would involve the interaction of the optical fiber mesh with an adequately designed interrogative electronic package. This paper focuses on the former aspect of the total system. It will address some recent experimental work showing the practicality of the concept for large, complex composite structure.
The Fourth International Conference on Unconventional Computation, UC 2005, organized under the auspices of EATCS by the Centre for Discrete mathematics and Theoretical Computer Science and the Department of C- puter ...
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ISBN:
(数字)9783540320227
ISBN:
(纸本)9783540291008
The Fourth International Conference on Unconventional Computation, UC 2005, organized under the auspices of EATCS by the Centre for Discrete mathematics and Theoretical Computer Science and the Department of C- puter Science and Arti?cial Intelligence of the University of Seville, was held in Seville, October 3–7, 2005. Seville, one of the most beautiful cities in Spain, is at its best in October. An explosion of colour and contrast: ?amenco, bull?ghting, and a lively at- sphere in the streets due to the open and friendly nature of its people. The river Guadalquivir, the Cathedral and the Golden Tower are all places full of magic where the visitor can feel the spirit of a city which is eternally romantic. The series of International Conferences Unconventional Computation (UC),https://***/CDMTCS/conferences/uc/isdevoted to all aspects of unconventional computation, theory as well as experiments and applications. Typical, but not exclusive, topics are: natural computing including quantum, cellular,molecular, neural and evolutionarycomputing; chaosand - namical systems based computing; and various proposals for computations that go beyond the Turing model. The ?rst venue of the Unconventional Computation Conference (formerly called Unconventional Models of Computation) was Auckland, New Zealand in 1998; subsequent sites of the conference were Brussels, Belgium in 2000 and Kobe, Japan in 2002. The titles of the proceedings volumes from past UC Conferences are as follows: 1. C.S. Calude, J. Casti, M.J. Dinneen (eds.). Unconventional Models of C- putation, Springer-Verlag, Singapore, 1998, viii + 426 pp. ISBN: 981-3083- 69-7.
A study of structural properties and electrical resistivity of [Tb/Ti] n and [Tb/Si]n multilayers deposited by rf-sputtering is presented. The transmission electron microscopy data show that the Tb layers with Ti spac...
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Connected Autonomous Vehicle (CAV) Driving, as a data-driven intelligent driving technology within the Internet of Vehicles (IoV), presents significant challenges to the efficiency and security of real-time data manag...
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Connected Autonomous Vehicle (CAV) Driving, as a data-driven intelligent driving technology within the Internet of Vehicles (IoV), presents significant challenges to the efficiency and security of real-time data management. The combination of Web3.0 and edge content caching holds promise in providing low-latency data access for CAVs’ real-time applications. Web3.0 enables the reliable pre-migration of frequently requested content from content providers to edge nodes. However, identifying optimal edge node peers for joint content caching and replacement remains challenging due to the dynamic nature of traffic flow in IoV. Addressing these challenges, this article introduces GAMA-Cache, an innovative edge content caching methodology leveraging Graph Attention Networks (GAT) and Multi-Agent Reinforcement Learning (MARL). GAMA-Cache conceptualizes the cooperative edge content caching issue as a constrained Markov decision process. It employs a MARL technique predicated on cooperation effectiveness to discern optimal caching decisions, with GAT augmenting information extracted from adjacent nodes. A distinct collaborator selection mechanism is also developed to streamline communication between agents, filtering out those with minimal correlations in the vector input to the policy network. Experimental results demonstrate that, in terms of service latency and delivery failure, the GAMA-Cache outperforms other state-of-the-art MARL solutions for edge content caching in IoV.
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