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The performance of hydraulic system plays an important role in roller mill. The hydraulic system was regarded as a vibration system with a single degree-of-freedom and the differential equation of roller was derived on the basis of the analysis of piston movement. It was found that the dynamic performance is affected by the damping ration, which depends on the performance of the hydraulic oil and...
Based on the test about compression-rebound properties of material bed, there are three zones in roller mill. The movement of material bed between two rollers in roller mill has been analysed. The pressure distribution equations in every zone on the roller's surface have been derived. The stress in roller is important for roller's failure analysis and the life estimation. But it depends on load, structure...
In recent years, foreign exchange intervention studying has become a hot spot in finance field. To extract rules between central bank intervention and its trigger factors based on history data will be very useful for decision-making of central banks and market participants. At present, the chief research methods are all based on econometrics to estimate the statistic characters, which are usually...
With the establishing of the idea that enterprises center on customers and development of the network technology, building an effective CRM system will be very important. CRM through data mining can get more efficiency in acquiring new customers, increasing value of existing customers and retaining good customers. At the same time, the data of data warehouse will offer the best data resource for the...
Pipe belt conveyor is a new type of special belt conveyor and it is wildly used in conveying powder material. In the paper, the advantages of pipe belt conveyor are introduced. Calculation of pipe belt conveyor??s main parameters is different from that of conventional belt conveyor??s. The parameters such as throughput, belt speed, belt width, resistance, tension in belt and power are described. The...
Data missing is inevitable in practical fields, how to analyze these incomplete data more efficient is important for data mining. Many methods such as statistical strategy are generally used, but all have some faults. The approach based on rough set theory is proved to be more excellent, but the existed method is still not perfect. This paper extends the valued tolerance relation in rough set theory,...
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