Yan, Dongqing
Pomicter, Anthony D.
Tantravahi, Srinivas
Mason, Clinton C
Senina, Anna V
Ahmann, Jonathan M
Wang, Qiang
Than, Hein
Patel, Ami B.
Heaton, William
Eiring, Anna M.
Clair, Phillip M
Gantz, Kevin C
Redwine, Hannah M
Swierczek, Sabina I
Halverson, Brayden J.
Baloglu, Erkan
Shacham, Sharon
Khorashad, Jamshid S
Kelley, Todd W
Salama, Mohamed E
Miles, Rodney R.
Boucher, Kenneth M
Prchal, Josef T
O'Hare, Thomas
Deininger, Michael W.
Wang, Qiang
Chen, Zhao Bo
Ahmadian, Mehdi
Liu, Wen Tao
In order to develop a compact and lightweight controllable damper for space truss structures vibration suppression, a novel double-piston magnetorheological (MR) damper is proposed. Working principle of this damper has been analyzed. One prototype damper have been designed and fabricated according to the analysis results. A series of experiments have been performed to get this prototype damper's dynamical properties. Hyperbolic tangent model have been used to describe damper's nonlinear hysteresis. After model optimization using the nonlinear least squares method, the relationship between damper force and drive currents have been acquired under different excitation conditions. Comparison between the reconstructed results and testing data indicates that the optimized model shows enough accuracy to not only present the experimental data, but also forecast the hysteretic properties of this damper.
Provided is an image generation method based on a dual camera module. The dual camera module comprises a first camera lens of large single-pixel size and a second camera lens of high resolution. The method comprises the following steps: the first camera lens generates a first image; the second camera lens generates a second image; synthesizing the first image and the second image to generate a third image. Correspondingly, also provided is a dual camera module. With the dual camera module, the present invention, by combining the advantages of the two camera lens, reduces color noise and luminance noise of an image, thus improving image quality and image luminance and details.
Bidirectional inter-basin water transfer is a special form of inter-basin water transfer, which can create a win-win outcome between two basins by utilizing the differences in flow regime from different basins. The objective of the research is to develop operating rules that consider both water transfer and water supply of water distribution system simultaneously for guiding the operation of multi-reservoir system in bidirectional inter-basin water transfer-supply system. The proposed rules include threefold: (1) triggering mechanisms for water transfer based on the storages of two equivalent reservoirs are presented for regulating the bidirectional water transfer between two basins, (2) water supply policy in the form of operating rule curves coupled to multiple hedging rules is proposed for guiding the water supply operation of multi-reservoir system, and (3) allocation approach of system release based on different priority demands is developed for determining the release from each reservoir. To obtain the optimal operating rules, the quantum-behaved particle swarm optimization algorithm (QPSO) is applied to a bidirectional inter-basin water transfer-supply system located in Liaoning province of northeast China. The results demonstrate that the obtained operating rules can guide the joint operation of multi-reservoir in bidirectional inter-basin water transfer-supply system in a mutually beneficial way.
Fundamental matrix encapsulates all the geometric information in two views, and it plays an important role in many applications of three-dimensional computer vision. However, some configurations have an inherent ambiguity, namely, degeneracy, and no matter how many matched image points are used, the fundamental matrix could not be determined uniquely. It is well-known that degeneracies occur when all the space points and both the camera centers belong to a ruled quadric. But it is not so well-known how great the degenerate degrees in different configurations are. In this paper, we discuss the degeneracies caused by a quadric cone and give the corresponding degenerate degrees. We parameterize all the points on a quadric cone by a twisted cubic lying on the cone, and obtain a parametric coefficient matrix of the equations for estimating the fundamental matrix. By analyzing the coefficient matrix, we get the rank of it, i.e. the degenerate degree of the given configuration. It gives a more intuitive degeneracy and the degenerate degrees of the configurations, and reveals the full picture of the degeneracies on a cone. (C) 2014 Elsevier GmbH. All rights reserved.