68,086 research outputs found
Explicit Multimonopole Solutions in SU(N) Gauge Theory
We construct multimonopole solutions containing N-1 distinct fundamental
monopoles in SU(N) gauge theory. When the gauge symmetry is spontaneously
broken to U(1)^{N-1}, the monopoles are all massive, and we show that the
fields can be written in terms of elementary function for all values of the
monopole positions and phases. In the limit of unbroken U(1) X SU(N-2) X U(1)
symmetry, the configuration can be viewed as containing a pair of massive
monopoles, each carrying both U(1) and SU(N-2) magnetic charges, together with
N-3 massless monopoles that condense into a cloud of non-Abelian fields. We
obtain explicit expressions for the fields in the latter case and use these to
analyze the properties of the non-Abelian cloud.Comment: 22 pages, no figure
Dissipation Effects in Hybrid Systems
The dissipation effect in a hybrid system is studied in this Letter. The
hybrid system is a compound of a classical magnetic particle and a quantum
single spin. Two cases are considered. In the first case, we investigate the
effect of the dissipative quantum subsystem on the motion of its classical
partner. Whereas in the second case we show how the dynamics of the quantum
single spin are affected by the dissipation of the classical particle.
Extension to general dissipative hybrid systems is discussed.Comment: 4+ pages, 4 figure
Sutured Khovanov homology distinguishes braids from other tangles
We show that the sutured Khovanov homology of a balanced tangle in the
product sutured manifold D x I has rank 1 if and only if the tangle is isotopic
to a braid.Comment: 9 pages, 1 figure, Definition of sutured annular Khovanov homology in
Section 2.1 has significant text overlap with arXiv:1212.2222; Version 2
incorporates referee comments. This is the version accepted for publication
in Mathematical Research Letter
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Communication in an "Officeless firm"
New technologies permit new types of organisations. This article describes and analyses one such organisation, an "officeless firm", where all employees work from their own homes and there is no central office. Drawing upon observations and interviews, the modes of communication and the nature of the interpersonal relationships that have permitted this organisation to succeed are described, along with the challenges that face this organisation in the future as it attempts to grow
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A dubiety-determining based model for database cumulated anomaly intrusion
The concept of Cumulated Anomaly (CA), which describes a new type of database anomalies, is addressed. A
typical CA intrusion is that when a user who is authorized to modify data records under certain constraints deliberately
hides his/her intentions to change data beyond constraints in different operations and different transactions. It happens
when some appearing to be authorized and normal transactions lead to certain accumulated results out of given thresholds.
The existing intrusion techniques are unable to deal with CAs. This paper proposes a detection model,
Dubiety-Determining Model (DDM), for Cumulated Anomaly. This model is mainly based on statistical theories and fuzzy
set theories. It measures the dubiety degree, which is presented by a real number between 0 and 1, for each database
transaction, to show the likelihood of a transaction to be intrusive. The algorithms used in the DDM are introduced. A
DDM-based software architecture has been designed and implemented for monitoring database transactions. The
experimental results show that the DDM method is feasible and effective
A pure-carbon ring transistor: The role of topology and structure
We report results on the rectification properties of a carbon nanotube (CNT)
ring transistor, contacted by CNT leads, whose novel features have been
recently communicated by Watanabe et al. [Appl. Phys. Lett. 78, 2928 (2001)].
This paper contains results which are validated by the experimental
observations. Moreover, we report on additional features of the transmission of
this ring device which are associated with the possibility of breaking the lead
inversion symmetry. The linear conductance displays a "chessboard"-like
behavior alternated with anomalous zero-lines which should be directly
observable in experiments. We are also able to discriminate in our results
structural properties (quasi-onedimensional confinement) from pure topological
effects (ring configuration), thus helping to gain physical intuition on the
rich ring phenomenology.Comment: 3 pages, 4 figure
Statistical and fuzzy approach for database security
A new type of database anomaly is described by
addressing the concept of Cumulated Anomaly in this
paper. Dubiety-Determining Model (DDM), which is a
detection model basing on statistical and fuzzy set
theories for Cumulated Anomaly, is proposed. DDM
can measure the dubiety degree of each database
transaction quantitatively. Software system
architecture to support the DDM for monitoring
database transactions is designed. We also
implemented the system and tested it. Our
experimental results show that the DDM method is
feasible and effective
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