Advanced Materials Research Vols. 424-425

Abstract: This paper takes the project oriented small and medium-sized enterprises as the research object and analyses the importance and necessity, summarizes the connotation of project oriented small and medium-sized enterprises, the stability of dynamic alliances, the performance of small and medium-sized enterprises and the risk management of small and medium-sized enterprises from the theoretical level. This is a basis for further study of construction problem of small and medium-sized enterprises dynamic.

Abstract: This paper describes a nonlinear adaptive dynamic inversion controller for a flexible air-breathing hypersonic vehicle model. The complete characterization of the nonlinear internal dynamic of the Bolender and Doman model with respect to velocity，altitude and angle as the regulated outputs is considered in this paper. The derivation of the internal dynamics presented in this work is comprehensive of the flexible dynamics. For the purpose of control design，we decompose the equations of motion into functional subsystems，namely，the velocity subsystem，the altitude and flight-path angle subsystem，and the angle of attack and pitch rate subsystem. Each subsystem is controlled separately using available inputs and intermediate virtual control commands. The adaptive fuzzy system is then developed to identify the uncertain in the model parameters. Simulation results are provided to demonstrate the robustness and the efficacy of the proposed controller

Abstract: Workflow is a critical enabler for achieving enterprise competitiveness with today’s hot technologies, as portals, e-business and e-commerce. Workflow modeling is the first step before workflow executes, and resources can become important decision factors. The lack of resources can cause contention, the need for some tasks to wait for others to complete, and the slowing down of the accomplishment of larger goals. In this paper, we discuss the resource model in workflow system, and define the resource-constrained model. The main merit of resource model is that it bridges the gap between the human and the machine level problem solving.

Abstract: The road traffic signs recognition in open environment is an important research in the field of safe auxiliary driving, vehicle autonomous navigation and so on. Based on the characteristic of road signs, one-dimensional entropy division was carried on to segment the AOI image obtained by lane detection, and then the road signs were recognized by SVM with improved Hu moment features. Experiments show that the proposed method for road traffic signs recognition in open environment has good reliability and robustness

Abstract: A stiffening function and a truncated function of the pair-potential of the modified analytical embedded atom method (MAEAM) were suggested for fcc metals. Through fitting the mono-vacancy migration energy, the elastic constants, the cohesive energy and an equilibrium condition of fcc metal crystals correctly, we determined the stiffening parameter and changed the pair-potential parameters and the modification term parameter of the multi-body potential for fcc metals: Ag, Al, Au, Cu, Ir, Ni, Pd, Pt, and Rh. The model calculations fully demonstrate the phonon dispersion curves and the unrelaxed mono-vacancy properties of the nine fcc metals.

Abstract: Introduced the history of development of crack damage detection technology and summarized the current state of damage detection technique based on modal analysis. Finite element method is the main method for mechanical structure modal analysis at present. Many researchers studied a single crack or multiple cracks impact on different structure’s dynamic characteristics, however, these studies only limited to the current state of structures with damage. Considering damage extending when mechanical structure being on work, a new method combines modal analysis and theory of damage extend is proposed to analysis the extending trend of damage, which make it easy to assess remaining life of mechanical structures and make structures that meeting design life can still being on work before they lose their effectiveness, this can save lots of costs

Abstract: As the performance of the wireless sensor networks is sensitive to the environment of the application, the analysis of wireless channel is carried out in the workshop of the chemical water treatment in power plant. With the power of noise and received signals sampled, the path-loss exponent γ is derived to establish the model of the wireless channel. To meet the requirement of the performance of wireless communication, such as a given bit error rate (BER), the upper bound of the distance between transmitter and receiver is also presented. At last, the conclusion is given.

Abstract: The layered recovery technology has been applied to the heterogeneous multi-layer standstone oilfields for many years. However, as these standstone oilfields have been entering into the ultra-high water cut period, the conventional layered water injection technology has too long test and adjustment period and heavy workload and cannot determine the reservoir condition. To solve this problem, this paper proposes and develops an intelligent multi-layer water injection technology suitable for the ultra-high water cut period based on the synchronous dynamic test and adjustment idea. The whole flow adjustment process has no any intervention and the synchronous dynamic flow adjustment of each layer finishes by the digital clock calibration thereby avoiding interlayer interference. This technology also can obtain data by the redisplay of computer. The experimental results show that this technology not only improves water injection effect and reduces the field workload, but also provides the basis of data analysis for implementation and adjustment of meticulous oil development plan

Abstract: The layered synchronous water injection technology in oilfield has such characteristics as strong nonlinearity, interlayer interference, time variation and complex model. The traditional control strategy based on the model often causes system unstable and regulation time too long, thereby making control effect unsatisfactory. To satisfy the requirements of layered synchronous water injection technology, this paper designs a flow controller based on adaptive fuzzy control algorithm with variable universe. The universe will change with variables parameters by adjusting extension-contraction factor. The experimental verification show that the system has good control performance, strong adaptability and short measurement and regulation time with the introduction of variable universe adaptive fuzzy control algorithm into flow control system of layered synchronous water injection technology

Abstract: The ion-exchanger Li_0.8Zn_1.1PO₄ of spinel type was prepared by means of the solid state reaction crystallization method, and was acid-modified. This inorganic ion-exchanger(Li_0.8Zn_1.1PO₄) has the saturation capacity of exchange for Li⁺ higher than those for other alkali ions, the saturation capacity of exchange for Li⁺ reaches to 3.0mmol/g.