Advanced Materials Research Vols. 181-182

Abstract: Trajectory modeling of moving objects is one of the key problems in spatio-tempo-ral databases research. In a series of moves spatio-temporal database information and finding time to update in actual application space and threshold distance threshold, this paper combines the ideas of the linear regression model in mathematics to propose the trajectory model, which is on the basis of the Moving Objects Spatio-Temporal model and supports the past, present and future information processing. It effectively predicts the moving objects of movement trend and scope at any time within the threshold.

Abstract: In this paper, for such a complex dynamical system as gear box, the transfer characteristic model of different excitation points and responsive points is constructed. Considering the actual condition that the vibration signals from different parts the inner gear box arrive in the box’ surface by different paths and mutual mixes, the basic method on sensor optimization and testing-point configuration based on PSO is put forward for fault detection. Through the testing analysis of every point’s transfer characteristic curve and the optimization of the transfer characteristic parameters, it is not only gives the basic optimization principle of testing configuration, but also proves that the sensor and testing-point optimal configuration technology based on PSO is feasible.

Abstract: This paper explores a novel danger theory based model to aware the situation for TCP SYN flooding attacks. Within in the presented model, the TCP SYN flooding attacks are looked as dangerous exogenous patterns, and induce danger signals to aware the situation of host computers, which is realized by hosted-based artificial immune detectors. After summarizing the danger theory, the model framework, correlative concepts, TCP SYN flooding attack detection, danger signal computation and attack situation awareness methods are described. Following that, the interrelated techniques are compared. Theoretical analysis results show that the proposed model is valid. Thus, it provides a good solution to computer network security.

Abstract: Inland river port has a unique advantage in the transport industry. In order to improve the efficiency of operation and management and optimize workflow, it is urgent to design and development of a suitable warehouse management system. Based on field research river port CX, a practical personalized warehouse management system is designed and developed. The practical operation shows that the warehouse management system runs normally and achieves the various basic operation functions of warehouse management. It includes receiving, warehousing, delivery, a library, direct shipment, transfer, query, user management, setting of basic information and other functions, can basically meet the company's individual business needs. In addition, the designs of various types of schedules also greatly help the company to conduct business operations. However, for the system to improve a grade, it is needed to improve appropriately in the follow-up.

Abstract: Considering the difficulty for the dynamic recrystallization to happen in Steel 26Cr2Ni4MoV, which was used to manufacture low-pressure steam turbine rotors generally, after-forging static recrystallization was studied with the thermo-torsion method. In order to investigate the influence of multi-step cumulative deformation on after-forging static recrystallization of Steel 26Cr2Ni4MoV, the thermo-torsion method was adopted to conduct a constant-temperature four-step torsion test at 900°C. The time gap between each step in the test agreed with that in real production. Results show that the influence of multi-step cumulative deformation on after-forging static recrystallization is almost the same with that of single-step deformation. It means that the nucleation and the growth of after-forging static recrystallization are related mainly to the last deformation and temperature-keeping time. Grain size can be controlled through the last deformation and temperature-keeping time. The findings supply the theoretical foundation for the said-steel controlled forging processes.

Abstract: In this paper, we apply minimum variance method for removing automatically ground and intermittent clutter (airplane echo) from wind profiler radar data. Using the concept of discrete multi-resolution analysis and non-parametric estimation theory, we develop Doppler echo power spectral, which allow us to identify the coefficients relevant for clutter and to suppress them in order to effectively restrain and remove clutter and increase the wind profile radar detection range and accuracy; must be on the air back to the effective spectrum of the spectral moments estimation. Using MATLAB simulation analysis , compared with the conventional method of analysis to verify the feasibility and effectiveness of the algorithm, also, try the algorithm is applied to the complexity of the weather with a strong interference case of precipitation particles; Data analysis showed that the actual detection, from the library in the lower spectrum moment estimation has been improved significantly.

Abstract: Lignin have been blended with low density polyethylene (LDPE). Maleic anhydride grafted high density polyethylene (HDPE-g-MAH) has been added as compatibilizing agent. The weight ratio of LDPE, ligin and HDPE-a-MAH were 75:25:7.5, 75:25:10 and 75:25:12.5, respectively. The mechanical properties of the blends were investigated according to Chinese standard GB/1447-2005 and compared with those of lignin/LDPE composites without compatibilizing agent. Scanning electron microscopy (SEM) was used to investigate the dispersion of the lignin and LDPE and the compatibilizing mechanism was analyzed. The results reveal that addition of compatibilizing agent increased the interfacial bonding strength of the composites, improved the mechanical properties and obtained the better dispersion of the lignin and LDPE.

Abstract: This paper describes some main design methods of the mechatronics system and control system of the self-balancing two-wheel mobile platform based on a CompactRIO embedded controller, two digital DC servo motors with two odometry encoders, etc. We use mechatronics-oriented virtual prototyping tools to design the mechatronics system using SolidWorks and LabVIEW. And we use fuzzy controller to control this mobile platform. Through several experiments of self-balancing, linear running, it was confirmed that the mobile platform could realize stable mobile motion in a flat surface environment by the fuzzy controller. Using these methods, we have designed a two-wheel mobile platform to keep itself balancing in order to carry something from someplace to another in the future. The two-wheel mobile platform has been manufactured successfully by CIMS & Robotics Center of Shanghai University. The self-balancing control software and the other software have been developed.

Abstract: The two kinds of composites, including nano-nitrile butadiene rubber (NBR)/epoxy resin (EP) and nano-acrylate/EP composites were prepared with the three-roll mill. The effect of nano-particles on the mechanical property of epoxy resin composites were investigated by tensile strength testing. SEM images were taken to characterize the decentralization of the nano-particles in the composites. Mechanical testing results were presented that the epoxy nano-composites has the higher tensile strengths after filling with nano-particles. The tensile strength of EP composites has been significantly improved with nano-NBR content 4 wt. % and the nano-acrylate content 3 wt. %, respectively. SEM results indicated that nano-particles can be evenly dispersed in the epoxy resin by the three-roll mill dispersion method.

Abstract: Contrary to problem of XPath query processing with a predicate in XML data stream and query optimization, this paper presents the solution of first completing Xpath query structure wizard, and then completing the predicate matching. In order to improve query processing efficiency, this paper proposes with XML document structure information to establish the structure index, with the structure index to pretreat structure wizard part of Xpath query, obtain the structure index of the path matching, then using the structure index of the path matching to process XML data stream, complete matching of XPath query predicate. It has been solved that large XML structure index, Xpath query with the predicate low efficiency, experimental results show that the algorithm can effectively speed up the search and reduce memory consumption.