Key Engineering Materials Vols. 474-476

Abstract: Plastics drain board method is one of the most effective ways of reducing excess pore water pressure during the process of dynamic compaction in soft soil subgrade reinforcement. Based on field test in neritic backfilled area of Jinzhou Port 207B berth, the pore water pressure, groundwater level, subgrade bearing capacity and time effect of deformation have been measured and analyzed. The application of dynamic compaction-PDB method makes a mighty advance of the dynamic compaction method, which provides a new way for soft soil treatment in coastal areas.

Abstract: The fast location is especially important, in the license plate recognition. In this paper, we received the candidate regions by the mathematical morphological operation, and then scanned the middle line of the binarized candidate areas. Determine the plate region using the black-white variations of the pixel in this middle line. This method is based on single line scanning which can reduce the computation time and improve the speed of license plate location.

Abstract: In order to detect double JPEG2000 compression, through analyzing the different statistical characterization of DWT coefficients between single and double compression, and through analyzing the “filling feature” of the DWT coefficients, we proposed a new method which we called as “Comparing the adjacent value around the maximum” in this paper. Experimental results show that this method is effective.

Abstract: The question of energy and enviorment is a hot question in the world, it is a hot and difficult problem in China also.To issue the sustainable growth of economy is the problem that all countries in the world care about including our country. So, this text sets up endogenous economic growth model by restricted energy and enviorament and discusses the condion of the economy sustainable development, and obtains the balanced economic growth path and some policy meanings.

Abstract: The three-dimensional helical gear model based on the geometric parameters is created by using software called PROE3.0. The natural characteristics of helical gear are analyzed by using the finite element method. The natural frequency of the helical gear is calculated by the software ANSYS and the principal mode of vibration is discussed. There are four vibration modes, which are circular vibration, torsional vibration, radial vibration and umbrella vibration. The phenomenon of resonance of the helical gear can be avoided by choosing suitable parameters and changing the natural frequency of the helical gear.

Abstract: Nanometer two-dimensional platform can realize the accurate positioning of X and Y coordinate, and it is the important parts of Nanometer Coordinate Measuring Machines (Nano-CMM),in order to realize the demand of large scale nanometer position , the magnetic stage is adopted, and magnetic stage control system is researched in this paper ,and designed the current loop, velocity loop and position loop controller, and the affection of variable control parameters are researched, and at last the magnetic stage system is realized.

Abstract: Because of its border nonlinearity, the contact between rolling element and ball race is difficult to be solved .With the development of computer technology and FEA theory, practical solution about contact is possible. This thesis which takes B7005C hybird ceramic ball bearing for example draws inner and outer contact stress and contact deformation and compares the results with Hertz solution by modeling, meshing, and setting contact pairs in ANSYS. The results show the use of ANSYS in bearing simulation is ideal, and can take a reference for the bearing simulation.

Abstract: Many existing text clustering algorithms overlook the semantic information between words and so they possess a lower accuracy of text similarity computation. A new text hybrid clustering algorithm (HCA) based on HowNet semantics has been proposed in this paper. It calculates the semantic similarity of words by using the words’ semantic concept description in HowNet and then combines it with the method of maximum weight matching of bipartite graph to calculate a semantic-based text similarity. Based on the new text similarity and by combining an improved genetic algorithm with k-medoids algorithm, HCA has been designed. The comparative experiments show that: 1) compared with two existing traditional clustering algorithms, HCA can get better quality and 2) when their text cosine similarity is replaced with the new semantic-based text similarity, all the qualities of the three clustering algorithms can be improved significantly.

Abstract: The paper addresses the realization of anti-stealth radar and the problems which modern radars are confronted with. With the application of spread spectrum technology to radars, the capability of anti-stealth and anti-jamming is improved. Signal-to-noise (SNR) of the receiver increases through raising the launching power. Intercept probability decreases by transmitting multiple PN codes. Range of radar detector increases on condition that the intercept probability is unchanged. Simulation results show the validity of the proposed method.

Abstract: Polymer and montmorillonite (MMT) clay composites are the hot topic of research because of its excellent performances, a kind of hyper-dispersant(MA) was synthesized as compatible component, and organo-montmorillonite(OMMT)/PP/MA composites were prepared by means of melt blending. The results showed that the PP /OMMT /MA were of better mechanical properties compared to (OMMT) /PP when the same content of MMT. When the weight content of PP/OMMT/MA is 100:2:0.5, the composites exhibited excellent machine performances, and the scanning electron microscopy showed the composites of (OMMT)/PP/MA were consistent., XRD test shows that PP has entered into layers of montmorillonite to form intercalated composites.