3,910 research outputs found
Classification of simple weight modules for the superconformal algebra
In this paper, we classify all simple weight modules with finite dimensional
weight spaces over the superconformal algebra.Comment: 18 pages, Latex, in this version we delete the Section 7 for
application to the superconformal algebr
Extended Preintegration for Relative State Estimation of Leader-Follower Platform
Relative state estimation using exteroceptive sensors suffers from
limitations of the field of view (FOV) and false detection, that the
proprioceptive sensor (IMU) data are usually engaged to compensate. Recently
ego-motion constraint obtained by Inertial measurement unit (IMU)
preintegration has been extensively used in simultaneous localization and
mapping (SLAM) to alleviate the computation burden. This paper introduces an
extended preintegration incorporating the IMU preintegration of two platforms
to formulate the motion constraint of relative state. One merit of this
analytic constraint is that it can be seamlessly integrated into the unified
graph optimization framework to implement the relative state estimation in a
high-performance real-time tracking thread, another point is a full smoother
design with this precise constraint to optimize the 3D coordinate and refine
the state for the refinement thread. We compare extensively in simulations the
proposed algorithms with two existing approaches to confirm our outperformance.
In the real virtual reality (VR) application design with the proposed
estimator, we properly realize the visual tracking of the six degrees of
freedom (6DoF) controller suitable for almost all scenarios, including the
challenging environment with missing features, light mutation, dynamic scenes,
etc. The demo video is at https://www.youtube.com/watch?v=0idb9Ls2iAM. For the
benefit of the community, we make the source code public
Energy Efficient Ant Colony Algorithms for Data Aggregation in Wireless Sensor Networks
In this paper, a family of ant colony algorithms called DAACA for data
aggregation has been presented which contains three phases: the initialization,
packet transmission and operations on pheromones. After initialization, each
node estimates the remaining energy and the amount of pheromones to compute the
probabilities used for dynamically selecting the next hop. After certain rounds
of transmissions, the pheromones adjustment is performed periodically, which
combines the advantages of both global and local pheromones adjustment for
evaporating or depositing pheromones. Four different pheromones adjustment
strategies are designed to achieve the global optimal network lifetime, namely
Basic-DAACA, ES-DAACA, MM-DAACA and ACS-DAACA. Compared with some other data
aggregation algorithms, DAACA shows higher superiority on average degree of
nodes, energy efficiency, prolonging the network lifetime, computation
complexity and success ratio of one hop transmission. At last we analyze the
characteristic of DAACA in the aspects of robustness, fault tolerance and
scalability.Comment: To appear in Journal of Computer and System Science
Electrochemical codeposition of nickel oxide and polyaniline
Nickel oxide (NiOx) and polyaniline (PAni) were
electrocodeposited from NiSO4 and aniline through cyclic
voltammetric scans to afford PAni–NiOx composite film at
controlled pH environment. The electrochemical activities of
the film were investigated by cyclic voltammetry in 0.1 M
NaOH and 0.1 M H2SO4, respectively. Typical redox couples
of PAni in 0.1 M H2SO4 appeared at approximately 0.2 and
0.4 V vs. saturated calomel electrode (SCE); Ni(II)/Ni(III)
redox couple was observed at approximately 0.4 V vs. SCE in
0.1 M NaOH. The morphologies and elemental components
of the films were inspected by scanning electron microscopy
and energy dispersive X-ray diffraction. The stability of nickel
oxide in the films was found to be enhanced against acidic
environments. Electrochemical catalytic behavior of NiOx
within the composite film was conserved and demonstrated
by catalytic oxidation of methanol and ethanol
Inhibition of activity of GABA transporter GAT1 by δ-opioid receptor
Analgesia is a well-documented effect of acupuncture. A critical role in pain sensation plays the nervous system, including the GABAergic system and opioid receptor (OR) activation. Here we investigated regulation of GABA transporter GAT1 by δOR in rats and in Xenopus oocytes. Synaptosomes of brain from rats chronically exposed to opiates exhibited reduced GABA uptake, indicating that GABA transport might be regulated by opioid receptors. For further investigation we have expressed GAT1 of mouse brain together with mouse δOR and μOR in Xenopus oocytes. The function of GAT1 was analyzed in terms of Na(+)-dependent [(3)H]GABA uptake as well as GAT1-mediated currents. Coexpression of δOR led to reduced number of fully functional GAT1 transporters, reduced substrate translocation, and GAT1-mediated current. Activation of δOR further reduced the rate of GABA uptake as well as GAT1-mediated current. Coexpression of μOR, as well as μOR activation, affected neither the number of transporters, nor rate of GABA uptake, nor GAT1-mediated current. Inhibition of GAT1-mediated current by activation of δOR was confirmed in whole-cell patch-clamp experiments on rat brain slices of periaqueductal gray. We conclude that inhibition of GAT1 function will strengthen the inhibitory action of the GABAergic system and hence may contribute to acupuncture-induced analgesia
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