Advanced Materials Research Vol. 459

Abstract: This paper adopts the method combining AHP and gray comprehensive evaluation to evaluate the operation performance of four largest domestic airlines and ten airlines that are famous around the world. Through the evaluation, it can be concluded that, compared with the excellent foreign airlines, the operation performance of the four largest domestic airlines is comparatively lagged behind. Among all the evaluated items, the repayment capability of the four largest domestic airlines is the worst which shall draw great attention of the enterprise leadership and other stakeholders

Abstract: The granary temperature and humidity measuring system , realization P89V51RD2 single chip as the main control core, and a RS232 bus communication mode of granary temperature and humidity monitoring system. Host by P89V51RD2 master MCU driving, and display temperature, humidity, and Luminance, entering commands by keyboard. Attached master machine used 51 core chip STC12C2052AD , digital temperature and humidity sensor SHT10 is used for data acquisition, master and attached master machine all use of serial communication. When the temperature and humidity calibration value is exceeded, it will alarm at the same time.

Abstract: In this paper, a design for testability methodology for a multi-mode navigation baseband SoC chip was presented, merging the various DFT techniques including boundary scan, MBIST, and full scan based ATPG. Implementation the technology of pattern compression was introduced in detail. Test results showed that this strategy is feasible, and meets the requirement of engineering applications. The test coverage of this chip is 97.53%, in the condition that, almost 30-fold test pattern compression is achieved

Abstract: Gearbox vibrations acquired by sensors are random cyclostationary signals, which are a combination of periodic and random processes due to the machine’s rotation cycle and interaction with the real world. Since the spectral structure of a gear vibration signal is mainly characterized by the interaction between the meshing harmonics and their sidebands, the spectral correlation density (SCD) function has been applied to gear monitoring. This approach is capable of completely extracting the fault characteristic frequencies related to the defect. This gives a desirable ability to detect the singularity characteristic of a signal precisely. This technique permits both fault detection and identification of the damaged gear. The experimental results show that the proposed method based on cyclostationary analysis can effectively diagnose the faults of gear.

Abstract: A series of dual-vortex fulid visualization and interaction instability experiments are undertaken with PIV (Particle Image Velocimetry) system under various experimental parameters sets. The motion characteristics and the circulation-time curves of the dual-vortex are presented through PIV processing and analysis. The dual-vortex distance b=50mm, main wingtip angle α1=10° & side wingtip angle α2=8° are optimum experimental parameters for vortices dissipation, the most vortex strength is reduced by 30%-40%

Abstract: It is a hot research project to find the heavy metal distribution in city topsoil and the level of pollution in city function region. Based on two dimension theory of Weiersreas, the eight heavy metal distribution is obtained, and the number of function region is calculated. Considering longitude and latitude of the polluted region, the high concentration distribution of heavy metals in area and the surrounding area is get. The pollution domain is found by using reverse Markov chain. The heavy metal pollution source is calculated from Gaussian diffusion model.

Abstract: This paper took one kind of 3-TPT Parallel Machine Tool (PMT) as the object of research. It mainly analyzed the influences of the position error of joint points in the fixed platform to the position error of tool of this PMT. Firstly, on the basis of introducing the structure of PMT, the kinematics of this machine was analyzed, and the inverse kinematics equation of this PMT was obtained. Then the influence situation of the position error of joint points in the fixed platform to the position error of tool was studied based on the kinematics analysis results and the error independent function principle, and the corresponding mathematical expression of error influence was established. Thus the theoretical foundation was laid for the comprehensive establishment of error model and the error compensation of this PMT

Abstract: A ladder search model is established by analyzing distribution and propagation characteristics of heavy metal in city topsoil. Based on matrix theory and graph theory, the ladder lattice path algorithm is given, the heavy metal pollution source points are found in industry region and other city zone. Considering the altitude, wind, rivers, time of heavy metal pollution effects, new improved model is get for the more accurate data of topsoil pollution

Abstract: The architecture of UHF RFID is designed and simulated based on ISO/IEC18000-6 protocol. The simulation is divided into the transmitter and receiver part using Matlab/Simulink. This article describes the architecture of the model in details, and achieves flexibly modulation and demodulation of different encoding types. Finally, some results of the simulation are presents

Abstract: By analyzing the propagation characteristics of heavy metal pollutants, a fuzzy clustering model is established. Based on the topography, residential areas, factories, roads, etc. as well as the index Muller, we get the degree of heavy metals pollution and a evaluation on comprehensive pollution, and we found that the weight of pollution of each category and the index of the comprehensive pollution of heavy metals on the region by using fuzzy clustering and fuzzy AHP