DSpace collection: 期刊論文

Treatment of acute radiation cystitis: comment

Tue, 27 Mar 2012 08:25:26 GMT

title: Treatment of acute radiation cystitis: comment

Experimental study on the whip elimination of rotor-bearing systems with electromagnetic exciters

Tue, 27 Mar 2012 08:25:24 GMT

title: Experimental study on the whip elimination of rotor-bearing systems with electromagnetic exciters abstract: The elimination of whip using electromagnetic exciters (EEs) is investigated in this paper. First, mathematical models of a rotor-bearing system are derived. The threshold of instability determining if the rotor-bearing system experiences fluid-induced instability is obtained. Then, an experimental rotor-bearing system is designed and constructed to justify the elimination of whip, and orbit, spectrum, and spectrum cascade plots are obtained from the experimental data. The proposed procedure applies root locus plots to simulate the threshold of instability, and the spring model is used to compute the stiffness that the system needs to address the whip problem. Moreover, design examples are illustrated to explain the calculation process that tackles the proportional (simulating stiffness) and derivative (simulating damping) parameters of the EE to improve the stiffnesses of the rotor-bearing system. The main contribution of the present experimental work is that by using the EE it is possible to increase the stiffness of the rotor-bearing system and lead to the rotor-bearing system with a higher threshold of stability and eliminate the whip instability. (C) 2010 Elsevier Ltd. All rights reserved.

AGE-DEPENDENT CHANGES IN THE MOTOR NETWORKS DURING HAND GRIPS

Tue, 27 Mar 2012 08:25:21 GMT

title: AGE-DEPENDENT CHANGES IN THE MOTOR NETWORKS DURING HAND GRIPS

Rapid convergence to the inverse solution regularized with Lorentzian distributed function for near-infrared continuous wave diffuse optical tomography

Tue, 27 Mar 2012 08:25:19 GMT

title: Rapid convergence to the inverse solution regularized with Lorentzian distributed function for near-infrared continuous wave diffuse optical tomography abstract: A promising method to achieve rapid convergence for image reconstruction is introduced for the continuous-wave near-infrared (NIR) diffuse optical tomography (DOT). Tomographic techniques are usually implemented off line and are time consuming to realize image reconstruction, especially for NIR DOT. Therefore, it is essential to both speed up reconstruction and achieve stable and convergent solutions. We propose an approach using a constraint based on a Lorentzian distributed function incorporated into Tikhonov regularization, thereby rapidly converging a stable solution. It is found in the study that using the proposed method with around five or six iterations leads to a stable solution. The result is compared to the primary method usually converging in similar to 25 iterations. Our algorithm rapidly converges to stable solution in the case of noisy (>20 dB) detected intensities. (C) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3299727]