32,975 research outputs found
Total embedding distributions of Ringel ladders
The total embedding distributions of a graph is consisted of the orientable
embeddings and non- orientable embeddings and have been know for few classes of
graphs. The genus distribution of Ringel ladders is determined in [Discrete
Mathematics 216 (2000) 235-252] by E.H. Tesar. In this paper, the explicit
formula for non-orientable embeddings of Ringel ladders is obtained
Design, analysis, and control of a cable-driven parallel platform with a pneumatic muscle active support
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence (funded by the DFG, German Research Foundation) respectively.The neck is an important part of the body that connects the head to the torso, supporting the weight and generating the movement of the head. In this paper, a cable-driven parallel platform with a pneumatic muscle active support (CPPPMS) is presented for imitating human necks, where cable actuators imitate neck muscles and a pneumatic muscle actuator imitates spinal muscles, respectively. Analyzing the stiffness of the mechanism is carried out based on screw theory, and this mechanism is optimized according to the stiffness characteristics. While taking the dynamics of the pneumatic muscle active support into consideration as well as the cable dynamics and the dynamics of the Up-platform, a dynamic modeling approach to the CPPPMS is established. In order to overcome the flexibility and uncertainties amid the dynamic model, a sliding mode controller is investigated for trajectory tracking, and the stability of the control system is verified by a Lyapunov function. Moreover, a PD controller is proposed for a comparative study. The results of the simulation indicate that the sliding mode controller is more effective than the PD controller for the CPPPMS, and the CPPPMS provides feasible performances for operations under the sliding mode control
Hexapod Coloron at the LHC
Instead of the usual dijet decay, the coloron may mainly decay into its own
"Higgs bosons", which subsequently decay into many jets. This is a general
feature of the renormalizable coloron model, where the corresponding "Higgs
bosons" are a color-octet and a color-singlet . In this paper,
we perform a detailed collider study for the signature of with the
coloron as a six-jet resonance. For a light below around 0.5 TeV,
it may be boosted and behave as a four-prong fat jet. We also develop a
jet-substructure-based search strategy to cover this boosted case.
Independent of whether is boosted or not, the 13 TeV LHC with 100
fb has great discovery potential for a coloron with the mass sensitivity
up to 5 TeV.Comment: 18 pages, 10 figure
A New RSSI-based Centroid Localization Algorithm by Use of Virtual Reference Tags
A good design of node location is critical for efficient
and effective wireless communications. This paper presents an
improved algorithm, in order to solve the low localization
accuracy caused by traditional centroid algorithm. The
improved algorithm combined with VIRE system and
traditional centroid algorithm. The VIRE algorithm is
introduced and the signal propagation model is utilized to
construct virtual reference tags in the location area. Simulation shows that this further developed algorithm has further improved the accuracy of positioning up to 35.12% compared
to the traditional centroid algorithm. It is concluded that this algorithm can further improve the locating accuracy in comparison with the original centroid algorithm
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