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Ultrasonic is one important factor of ultrasonic wire bonding process, which is widely used in semiconductor packaging industry. Control effect of ultrasonic power determines the quality and speed of wire bonding. Based on analysis of ultrasonic frequency characteristics and current response, this paper proposes a closed-loop control method of automatic frequency tracking and output current control,...
Optical navigation technology is widely used in precision guidance for autonomous landing and hazard avoidance. According to the requirements of the computer vision landing location system on a planetary lander, this paper proposed an algorithm to automatically obtain the precise landing position, which is based on optical image features. The main contents of this paper are as follows: Firstly, an...
Progresses in the study of speciation and biological uptake of arsenic in soil are introduced. The researches on bioavailability of arsenic are summarized, and the main factors which affect arsenic bioavailability are emphatically discussed. Relationship between speciation and availability of arsenic is concluded and the concerned problems and future development orientation are pointed out.
Logistics programming in natural involves dispatching commodities to distribution centres in disaster areas as soon as possible so that relief operations are accelerated. In this study, three planning models are to be integrated into a natural disaster logistics decision support system. The system readily decomposed into three problems the first one being fuzzy clustering disaster grades by historical...
In the network manufacturing, due to the complexity of manufacturing systems, product diversity, the breadth of information and users higher demands of products, particularly the differences of the parts which compose of the product, make remote product quality control more difficult and complicated. In order to solve the above problem, this paper organically combines case-based retrieval technology,...
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