Advanced Materials Research Vols. 989-994

Abstract: In order to adapt the spectrum property of Zadoff-Chu sequence to the requirement of HF channel sounding transmitter-receiver, the Formula Direct Interpolation Algorithm (FDIA) is put forward by which the amplitude frequency characteristic of Zadoff-Chu sequence can be enhanced. Then the comparison of spectra of the sequences respectively interpolated by FDIA and commonly used interpolation algorithm is conducted, which affirms the superiority of FDIA. Finally, an effective method of achieving best decimation of the sequence interpolated by FDIA is provided. All these lay primary theory foundation for the application of Zadoff-Chu sequence to HF channel sounding.

Abstract: In order to distinguish the different patterns and evolving trends on turnovers of agricultural products futures between Zhengzhou Commodity Exchange (Z-CE) and Dalian Commodity Exchange (D-CE), a novel time-frequency analysis approach, i.e. Hilbert-Huang transform (HHT), is investigated in this paper. Firstly, Hilbert-Huang transform is briefly introduced. Secondly, two different non-stationary signals of turnover of agricultural products futures from 2009 to 2013 coming from Z-CE and D-CE are described in Empirical Mode Decomposition (EMD). With these results, the two signals are distinctly different from each other. It is proved that the technique of HHT is effective for the purpose of distinction of turnover of agricultural products futures in commodity exchanges.

Abstract: In this paper, the mathematical equivalence between the conditional mean of a Epanechnikov mixture model (EMM) and the defuzzified output of a rule-centered generalized fuzzy model (RCGFM) is derived theoretically. Our results provide a new perspective for fuzzy systems, i.e., interpreting them from a probabilistic viewpoint. Thus, instead of directly estimating the parameters of the fuzzy rules in a rule-centered generalized fuzzy model, we can first estimate the parameters of the corresponding EMM using any popular density estimation algorithm like the expectation maximization (EM) algorithm. Our experimental results clearly indicate that a rule-centered generalized fuzzy model trained in such a new way has higher approximation accuracy and generalization ability than other models.

Abstract: In this paper, a multifactor grey forecasting model of agriculture output value is proposed. Agriculture output value is very important in the country. It can help us to well know the situation of agriculture, and to modify the policy of agriculture. When the data change greatly, one-factor forecasting model may not be get good results. Grey forecasting model with multifactor would be better. From the simulation, this multifactor grey forecasting model with gross and total farm output value can get better effects.

Abstract: Based on maximum likelihood, research a new based on Symbol Detection (Multi-Symbol Detection, MSD) soft demodulation method of PCM/FM telemetry signals. Introduced the basic principle of the demodulation method and the implementation process, analyzed the demodulation and synchronization factors and formulate the corresponding synchronization strategies.

Abstract: The choice of the motion features affects the result of the human action recognition method directly. Many factors often influence the single feature differently, such as appearance of human body, environment and video camera. So the accuracy of action recognition is limited. On the basis of studying the representation and recognition of human actions, and giving full consideration to the advantages and disadvantages of different features, this paper proposes a mixed feature which combines global silhouette feature and local optical flow feature. This combined representation is used for human action recognition.

Abstract: This paper discusses a diagnostic model based on the fuzzy relation equations in the diagnosis model, adding a time parameter, given the consistency between the fault symptom set and a set of observed signs of relevance, coverage, and equal quantitative indicators, these quantitative indicators can guarantee that the omission of a potential fault is neither in the case of incomplete knowledge, but also to get the best known symptom set matching solution. At the same time, diagnose problems in the knowledge of the adequacy and completeness of their relationships.

Abstract: Pro/Engineer (Pro/E) was applied to design a new kind of motorcycle belt pulley straightening machine, which was composed of electric cylinder and stepper motor in this paper. The effect of positioning and correcting were achieved by the straightening machine during operation. The motion simulation for correcting key parts was done under mechanical module of the software. The mechanism motion speed and the motion trails of the straightening machine were acquired under different positioning accuracy. Through analysis on the motion trails, the best range of the correcting parts′ rotational speed can be optimized.

Abstract: For the research of the mine large displacement spray pump in structure characteristics, each part of the spray pump should make use of Solidworks 3 d modeling, then assembled to be assembly at the same time. During the process of assemble, the assembly must be checked for interference. And simulate the spray pump motion, operation parameters are obtained according to the basic parameters and theoretical analysis. It’s of great significance to enhance the efficiency of the practical production in coal mine by bearing the main stress, testing and optimizing the performance of the crankshaft.

Abstract: PDC anchor bit has the very good rock fragmentation abilities with high penetration rate and long drilling time,which makes the drilling efficiency highly improved and the economic benefit remarkably increased.Now PDC anchor bit has been widely used in drilling field.But for the reason that it is sensitive to the formation characteristics and working conditions,it doesn’t achieve good performance in homogeneous formations such as conglomerate and interbeded sections.In order to reach the goal of enlarging the scope of PDC anchor bit application in oilfields,it is necessary to study the breakage mechanism in conglomerate formations and design the PDC anchor bit optimally.