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Aimed at the stabilization problem of the translational oscillator with a rotational actuator system (TORA) with unknown parameters, an adaptive state feedback controller with explicit form is proposed. The proposed controller is constituted by a feedback controller and an adaptive law of unknown parameters. The stability of the TORA under the proposed controller is proved. Finally, the effectiveness...
In continuous casting, it is very important to predict the center segregation of billet in time for ensuring continuous production, improving product quality and reducing production costs. The data in the process of production is used to establish the quality prediction model of center segregation in continuous casting billet, which is based on the improved combination method and ladder parameter...
Faced with the increasing large scale video databases, retrieving videos quickly and efficiently has become a crucial problem. Video text, which carries high level semantic information, is a type of important source that is useful for this task. In this paper, we introduce a video text detecting and tracking approach. By these methods we can obtain clear binary text images, and these text images can...
In the present work, a close-to-product investigation was conducted in evaluating tin whisker growth on electroplated matte Sn films. The matte Sn films were deposited on Cu leadframes (C194). Electroplating Ni film was used as a barrier between the Sn film and the substrate. The experimental results revealed that Ni barrier could completely restrain the tin whisker growth after 8,000 hours storage...
In this work, we fabricate bright tin films on two kinds of representative lead-frame substrates (C194 and FeNi42). Ni film was electroplated between Sn plating and the alloy substrate as a diffusion barrier. The samples were stored under 55 °C / 85% RH condition for up to 8,000 hours. The effect of alloy substrate, tin film thickness and Ni barrier on the tin whisker growth was investigated for a...
In this paper we develop an expanded mixed finite element method for nonlinear non-Fickian diffusion model in viscoelastic polymers. The method can approximate the unknown function, its gradient and its flux. Optimal order error estimates in L2-norm for the unknown function, its gradient and its flux are obtained.
Electroless Sn films have great potential in the lead-free age such as for high-density, fine-pitch, narrow soldering pad and bump interconnection applications. In the present work, electroless Sn were deposited onto lead-frame alloys (C194 and FeNi42). The microstructures of the electroless Sn films and tin whisker growth in thermal / humiditive chamber were investigated with scanning electron microscope...
Electroplating matte Sn has attracted much attention in the lead-free age. To prevent a growth of tin whiskers from lead-frame supported matte tin films, various mitigation methods have been reported. In this work, pure matte Sn was electroplated onto C194 alloy, and electroplating Ni film was used as barrier between matte Sn and lead-frame alloy. The microstructures of the Ni/Sn depositions and tin...
Purpose: To evaluate echocardiograpy and 64-Multi-slice computed tomography angiography (64-MSCTA) in diagnosing coronary artery fistula (CAF). Methods: the data of 15 patients with CAF confirmed by surgical operation or digital subtraction angiography (DSA) were retrospectively analyzed. All the patients were examined by echocardiograpy, of whom 4 were further examined by 64-MSCTA for more detailed...
Electroplating Sn plays an important role in the lead-free age because of its excellent solderability and many other advantages. In this work, bright Sn was electroplated onto both C194 and FeNi42 alloys. The plating parameters, substrate effect, barrier layer effect and IMC formation were investigated through detailed microstructural characterization of the Sn films, barrier layers and cross-sections...
The development of two-photon materials that can undergo efficient photochemical processes, radical or acid generation and metal reduction, and their use in 3D microfabrication of polymeric, metallic, and titania-organic hybrid materials will be discussed.
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