4,567 research outputs found
Neuro-adaptive vibration control of composite beams subject to sudden delamination
No full textExperimental studies on the adaptive vibration control of composite beams with a piezoelectric actuator have been performed using a neural network controller. We experimentally investigated the variations in natural frequencies and actuation characteristics of the composite specimens according to delaminations in the bonding layer. Numerical simulation has been performed for adaptive vibration controls of the composite specimens with delaminated piezoclectric actuator using the neuro-controller. A digital signal processor (DSP)-based hardware for the real-time adaptive vibration control experiment was prepared. Using the neuro-controller, the adaptive vibration control experiment has been performed. The vibration control results show that the present neuro-controller has good performance and robustness with respect to the system parameter variations. (C) 2000 Academic Press.The present work was supported by the Korea Science and Engineering Foundation
(Project No. 96-0200-05-01-3)
Faecal DNA typing to determine the abundance and spatial organisation of otters (Lutra lutra) along two stream systems in Kinmen.
No full textRandom weighting and Edgeworth expansion for the nonparametric time-dependent AUC estimator
No full textVibration and actuation characteristics of composite structures with a bonded piezo-ceramic actuator
No full textFor the design of vibration control systems of composite structures using piezo-ceramic actuators, it is necessary to obtain an accurate system model. Especially, the information related to natural modes, damping ratios and modal actuation forces appears in the governing state space equations. A refined finite element analysis based on the layerwise displacement plate theory has been performed to obtain the system parameters of composite plates with piezoelectric actuators. In this study, the present finite element method has the capability to take account of the stepped effect due to partly bonded piezo-ceramics. Also modal testing techniques have bean applied to identify the system parameters experimentally. Through the comparison of numerical results with experimental data, the validity of the numerical procedures has been proved.The present work was partially supported by the Korea
Science and Engineering Foundation (project No 96-0200-
05-01-3). This support is gratefully acknowledged
Honokiol, a small molecular weight natural product, alleviates experimental mesangial proliferative glomerulonephritis.
No full textWellesly Sh. W. to Mr. James Meredith (2 October 1962)
No full textSigned by Wellesly Sh. W.https://egrove.olemiss.edu/mercorr_pro/1531/thumbnail.jp
Posture and Pull Pressure by Horses When Eating Hay or Haylage from a Hay Net Hung at Various Positions
No full textThese studies assessed the pressure forces exerted by horses to extract forage from haynets. Study 1 measured horse posture and pressure in Newtons (10 N = 1 kg Force) exerted on haynets when feeding from either a single (SH) or double layered (DH) haynet (3 kg Hay), hung low or high. Mean and maximum pull forces were higher for the DH vs. SH (DH: 81 ± 2 N, max 156 N; SH: 74 ± 2.9 N, max 121 N; p < 0.01). Horses pulled harder on low (max pull 144 ± 8 N) compared to high (109 ± 8 N; p < 0.05) hung haynets. Mean maximum angles (nose-poll-withers) recorded were 90° ± 9 for SH and 127° ± 10 for DH (p < 0.01). Study 2 was a latin square design measuring forces exerted by 10 horses when eating from haynets (6 kg fill) with hay or haylage and attached to the wall at single or double points. Pull pressures were significantly higher when eating haylage compared to hay (mean: 7.5 kg vs. 2 kg and max: 32 kg versus 12 kg, respectively, (p < 0.001). Forage type and fracture properties had the greatest effect on apprehension rates of hay from haynets. In this study, the majority of force exerted when eating from haynets was below 70 N for hay and for haylage 50% of pulls were higher than 50 N with 8% of pulls above 200 N
Induction of Fibroblast Growth Factor-9 and Interleukin-1{alpha} Gene Expression by Motorcycle Exhaust Particulate Extracts and Benzo(a)pyrene in Human Lung Adenocarcinoma Cells.
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