Advanced Materials Research Vols. 171-172

Abstract: Frequency response character of ultrasonic transducer often influences on the test signal partly, and then test errors arise. To the problem, a compact method is proposed to calibrate the frequency response in this paper. The experiment data was obtained in water- immerging test of the transducers, and a discrete transfer function is established based on system identification algorithms and then used for transducer calibration. The method is validated effective by experiment. Not only can the characteristic of transducers be indicated, but also a referenced method is presented for calibrating frequency response of LTI system.

Abstract: The methods of vector transform and PI controller are used in no-load cutting-in control scheme of the system of doubly fed induction wind power generator, but the control methods depend on the parameters of electronic machine strongly. For raising the steady of wind power generating system, this paper designs a fuzzy PI controller which with strong robustness and fast dynamic response of fuzzy controller and better steady precision of PI controller. The result of simulation indicates that the fuzzy PI controller not only shorts the process of no-load cutting-in, but also has strong robustness and fast dynamic response, it is an ideal cutting-in control strategy.

Abstract: Based on a new type of sprayed liquid desiccant total heat recovery device, a liquid desiccant system combined refrigeration system with the independent humidity control (IHC) strategy is presented, in which the entire latent load and part of the sensible load are removed by liquid desiccant fresh unit combining heat pump (LFUH). The air-conditioning cooling load of a commercial building is simulated by DEST software. And the energy consumption is calculated respectively for conventional air conditioning system and IHC system. Compared with ordinary systems, IHC system can achieve savings of about 20% of the power consumption per annum. In addition, the average coefficient of chiller performance (COP) can increase about 13.5%. The result sows that IHC system has better application prospects.

Abstract: This paper introduces the hardware design of digital optical power meters and the algorithm flow.The power meter detector, with InGaAs-PIN photodiode and LTC6078,is used as a preamplifier for the measurement of micro-current;Silicon Laps C8051f410 are selected as the micro-controller for AD quantification and data processing, and the linear fitting of the measured data and standard data is completed in Matlab environment.After the comparison between the two measurement results,the proposed optical power meter adopts certain algorithm to compensate the deviation and improve the overall performance.The analyses of measured data show that:the optical power meter can be designed to precisely measure multi-wavelength with wide dynamic range and high sensitivity,support AC and DC dual power supply,and be portable.Therefore It also can be used both by university laboratories for teaching and by government department for construction monitoring and optical communications maintenance.

Abstract: In this paper, we discussed the relationship between Quality of Work Life and employee outcomes in China. We used organizational commitment and organizational citizenship behavior (OCB) to reflect employee outcomes. By employing several statistics techniques, such as factor analysis, reliability and validity analysis, the data of questionnaires has been analyzed. The results show that there is a significant positive relationship between QWL and all the indicators of employee outcomes (Organizational Commitment and OCB).

Abstract: The objective of this study was using methods of emergy theory to calculate the flow of emergy on eco-economic system in Liuzhou from 2004 to 2008, in order to analyse emergy relationship of ecological economic system including society, economy and ecological subsystems. The results showed the emergy self-sufficient ratio, the net emergy yield ratio decreased year by year, but the environmental loading ratio and population carrying capacity increased in recent years, and Emergy index for sustainable development decreased rapidly. This study could put forward countermeasures for sustainable development of Liuzhou ecological economic system.

Abstract: Built environment is determined by outside climate condition. There are a lot of important factors that influence building energy consumption such as building shape coefficient, insulation work of building envelope, covered area, and the area ratio of window to wall. In order to determine how building energy efficiency works in different climate zones, the variation rule of some aggregative indicators and building energy efficiency rates were analyzed by dynamic simulation. The results show that energy conservation potential which is brought by the decrease of builidng shape coefficient is the largest in hot summer and cold winter zone such as Shanghai, and the effect is mainly brought by insulation measures added to exterior walls.

Abstract: Research on negative association rule in multidimensional data mining is few. In this paper, an algorithm MPNAR is put forward to mine positive and negative association rules in multidimensional data. With the help of the basis of the minimum support and minimum confidence, this algorithm divided the multidimensional datasets into infrequent itemsets and frequent itemsets. The negative association rules could be mined from infrequent itemsets. Relative to the single positive association rule mining, the new additional negative association rules need not repeatedly read database because two types of association rules were simultaneously mined. Experiments show that the algorithm method is effective and valuable.

Abstract: This study took systematic science as key researching angle, which took folk sports as a gradually evolution active system, and regarding disciplines development as the key motivation on folk sports system evolution. Through the distinguishment from internal and external negative factors of folk sports system, the author thought that the main factors of restraining folk sports disciplines system development existing in three areas: the first area is the developing strategic crisis of disciplines; the second one is the crisis of folk sports disciplines construction and disciplines system; and the last one is the local folk sports cultural development crisis. The study points out that only to construct sound disciplines system of folk sports in China, which can get sustainable development, if rather not, a great number of excellent traditional cultural folk sports programs face to be extincted, this manner is beneficial and great significance to reserve and pass down the traditional folk sports.

Abstract: In this paper, the respective harmonic magnetic field generated by the two sets of stator windings of radial laminated magnetic-barrier rotor brushless doubly-fed machine has been analyzed with the winding function method, the calculations of the radial forces on stator’s inner edge which are resulted from the fundamental and harmonic magnetic field that generated by the two sets of stator windings have been made, and the radial forces of three kinds of such machines with different rotor pole numbers have been compared, all the above can provide theoretical guidance for optimized design of radial laminated magnetic-barrier rotor brushless doubly-fed machine.