Key Engineering Materials Vols. 480-481

Abstract: Super iron concentrate (TFe>71%, SiO2 <2%) which technical content and additional value are high which is not only a deep process product of processing but also is a new kind of function material.The present application of super iron concentrate is introduced. Its production technique and typical process are summarized, the research direction in the future analyzed simply.

Abstract: Photon-electron pumping effects on a quantum dot connected to two magnetic leads in the presence of both via-dot and over-dot tunneling channels have been investigated by the evolution operator approach. It is found that a time-variant field applied to the quantum dot may give rise to charge and spin pumping at zero bias voltage for asymmetric magnetic junctions. When the magnetic field switch on，the spin-up and spin-down current can be considerably separated，then the highly spin polarized current is also generated.

Abstract: In ocean surface modeling a popular method of wave modeling is making use of ocean wave spectrum, which is a physical wave model and based on linear wave theories. The ocean waves produced in this way can reflect the statistical characteristics of the real ocean well. However, few investigations of ocean simulation have been focused on turbulent fluid under vary wind field in this way, while all ocean wave models are built with the same wind parameters. In order to resolve the problem of traditional method, we proposed a new method of dividing the ocean surface into regular grids and generating wave models with different parameters of wind in different location of view scope. The method not only preserves the fidelity of statistical characteristics, but also can be accelerated with the processing of GPU and widely used in VR applications.

Abstract: Existing incentive mechanisms mainly describe the fuzzy index such as local credit with integer, which can’t avoid distortion of the description. Because Vague set can describe and process fuzzy information very well, this paper uses credit, that is represented by Vague set, to describe the resource nodes’ credibility, and introduces corresponding incentive mechanism and penalty mechanism to update the credit of resource nodes, in order to decrease the vicious nodes’ harm to resource discovery and encourage more good resource nodes to join in the grid. Finally, this paper improves the resource matching algorithm which is based on Vague set with incentive mechanism and penalty mechanism. Simulation test demonstrates that the introduction of incentive mechanism and penalty mechanism increases the resource matching algorithm’s capability of discovering resource obviously.

Abstract: The uneven illumination distribution would affect the accuracy and stability of an optical multi-touch system. In this paper, different self-adaptive methods based on the type of interference source are integrated. When the ambient lighting changes, the luminance of the captured image will changes accordingly. This method tests the type of interference source by the speed and the region of ambient lighting change, and uses different function to update the background image rapidly. Experimental results show that with the help of the presented solutions, the ghost points are efficiently reduced and the system can adapt to the changes of ambient lighting in only 1 second.

Abstract: The paper presents a dedicated kinematics-based simulation system for quadruped robot gait study, named as TQRSS. The system employs Ginac’s symbolic computation technology, making it possible on-line planning and help concentrate on robot gait planning and parameter adjusting. The Taishan quadruped robot’s kinematics analysis is also presented.

Abstract: The problems of stochastic stability and robust reliable sliding mode H∞ control for a class of nonlinear matched and mismatched uncertain systems with stochastic jumps are considered in this paper. A more practical model of actuator failures than outage is considered. Based on the state feedback method, the resulting closed-loop systems are reliable in that they remain robust stochastically stable and satisfy a certain level of H∞ disturbance attenuation not only when all actuators are operational, but also in case of some actuator failures. The uncertain system under consideration may have mismatched norm bounded uncertainties in the state matrix. The transition of the jumping parameters in the systems is governed by a finite-state markov process. A sufficient condition is given for the existence of integral sliding surface in terms of linear matrix inequalities (LMIs). Then, a reaching motion controller is designed such that the resulting closed-loop system can be driven onto the desired sliding surface in finite time. Moreover, a state feedback controller is also constructed by using the solution of LMIS. Finally, we give a design example in order to show the effectiveness of our method.

Abstract: The system dynamics mathematical model for 8-R seven-bar Ⅲ linkage is induced through plurality, and then translated into matrix format, the modeling is solved for given mathematical model as well as the correctness of overcome is analyzed to give relative response curve, and the purpose is to calculate energetic parameter during the mechanism working precisely, meanwhile experiment results show constraint reaction force and driving force in the process of shearing with rolling-cutting bilateral shear , by using statistical energetic parameter to verify the correctness of above mentioned mathematical model as well , which gives a basis for design , control principle analysis and practical use for the mechanism .

Abstract: The model of service resource based on ontology is referred to meet the demand of flexibility and re-configurability of enterprise application resources. PLIB Ontology as new entrants with new business models pour into the business-to-business space, it's increasingly difficult to make sense of the landscape. The paper analyzes the current situation of business environment and business intelligence systems integration at first. Through requirement analysis, we think PLIB ontology is fit for the solution of these requirements (unambiguous description, integration automatically, variant design in real time etc). Then a generic conceptual framework will be developed and a prototype implementation of the generic concepts will be benchmarked in system design of business intelligence systems. It can help confirm the keystone of the construction of business intelligence systems and the direction of system integration.

Abstract: By selecting 30-year meteorological data of two meteorological stations near Xiamen-Zhangzhou Cross-Sea Bridge in China, and using the distribution type testing and fit methods, not calculating the wind speed at the azimuth angle, and based on wind direction frequentness, the maximum possible extreme value of the wind speed and direction will be estimated. The calculated results that the design basic wind speed used in the specification is greater than the results obtained through actually measurement.