Advanced Materials Research Vol. 1055

Abstract: This article evaluate the recycling of renewable fiber feasibility from the economic cost, the key factor is the treatment methods, reuse direction, and its economic costs. Textile fiber material recycling economic cost, mainly through analysis the cost of new textile fiber materials prices and the price of recycled fiber, of which the price of recycled fiber is the recovery of the prices of textile fibers combined with the recycling processing costs.

Abstract: Analog circuit fault diagnosis is essentially a multiple state pattern classification problems. The traditional support vector machine classifier is for binary classification problems. In more than three kinds of commonly used class promotion model. This paper adopted the decision directed acyclic graph of multi-value classification algorithm. Multi-fault SVM classifier model is established. And the kernel function selection and nuclear parameter determination method were studied. Based on this model, support vector machine is used for analog circuit fault diagnosis given the basic idea and implementation steps. In analog circuit fault feature extraction technology, the effective sample point voltage amplitude response signal as well as the fault characteristic samples are extracted by wavelet packet decomposition of the energy spectrum method to extract the signal fault characteristics as the fault samples, formed based on effective sampling points. The SVM classifier is based on wavelet packet decomposition and the SVM classifier two methods of analog circuit fault diagnosis.

Abstract: The purpose of this research is to find propagation rules and development of shock wave caused by roof caving in goaf. The test equipment which was used consisted of high-speed camera and schlieren system. Different kind of roadways have been designed to discuss the propagation rules and development of falling shock wave in different roadway.The results of the experiment indicated that no matter what kind of roadway the shock wave in, the propagation process can roughly divide into two stages. In the first stage, the velocity of shock wave is slower than the second stage and the face of shock wave are clearer, the lines are smoother. But in the second stage, the velocity of shock wave are faster than the first stage and there are many whirls, the lines are more tiny and chaotic. Further research into shock wave caused by roof caving in goaf is necessary.

Abstract: The results of the model test and field test which are proposed in soil pressure calculation indicate that soil pressure distribution is mostly non-linear. Using two models, the soil arching effect and horizontal unit by two theories of rigid retaining wall and non-linear soil pressure, combine with test material to calculate and analysis. The soil arching effect model calculated value on the upper part of retaining wall is higher than horizontal unit model, closer to the static soil pressure, which mainly relates to the upper part of the soil arching effect expresses in sufficiently. As the soil arching effect expresses in the lower part, its value is lower than horizontal unit model; both total soil pressure are the same; the resultant force point of the soil arching effect is higher than the horizontal unit model, the results of calculation and analyses are more well coincide to the virtual discipline. Basing on it, putting forward a kind of soil pressure calculation model which considers the space-time effect and reflects the soil pressure distribution is non-linear.

Abstract: In the distributed power system, many data in every node needs to be monitored, but the function of current electrical measuring instruments is limited, which make it difficult for organizing a full function node. This paper proposes a kind of analyzer for measuring key data of three-phase power system, and this analyzer is designed on MCU-ADUC836 with mini transformer. Functions of data monitoring, record and online analyzing are realized by it, and the result shows that the embedded three-phase power system data analyzer obtains characters of high accuracy and reduces the number of measuring instruments in the distributed power system.

Abstract: In this paper, we discuss the applications of UC/OS-II and DSP(digital signal processor) in area of harmonic analyzing. In this research, the FFT algorithm is employed, and the realization of FFT on DSP is discussed. The whole system is based on UC/OS-II operation system, which coordinate all the tasks about the system. The system based on DSP+ARM and UC/OS-II improve the reliability and real time quality. The hardware design and software design are proposed in this paper, with flow chart and part of routine codes shown.

Abstract: Based on the Guobu topographic survey project in Laxiwa hydropower station at Yellow River, different models of Riegl laser scanning equipment were used to measure each testing area’s topography. Laser scanning measuring technique plays a great role in the process of the hydroelectric topographic survey, and its efficiency works several times higher than that of using traditional measuring means. Moreover, it also can shorten measurement period and reduce the field cost of production, which can achieve good economic benefits and social benefits consequently.

Abstract: At present, long span continuous rigid frame bridge is widely used in the expressway in mountain areas. Mountain areas have the features of terrain with continuous ridges and peaks, crisscross network of ravines, changeable climate and large temperature difference between day and night, while continuous rigid frame bridge of the expressway in mountain areas usually has long pile foundation, great bulk of bearing platform, high main pier and long span, which all increase the construction difficulty of long span continuous rigid frame bridge of the expressway in mountain areas. This paper will take the construction process of Longtan River Bridge built in Hurong Xi highway in Hubei province as an example, to study and discuss the key construction techniques of long span continuous rigid frame bridge of the expressway in mountain areas.

Abstract: With the development of society and economy, China's investment in construction projects is increasing, which requires the construction and management staff to improve their professional level, to develop a more scientific construction plan to ensure construction quality, and ultimately to the construction goal. Especially in deep foundation excavation process, it not only needs to upgrade the technological level of the excavation, but also needs to enhance the impact of researches on the approaching buildings to make the appropriate preparations to reduce adverse effects on the surrounding buildings, which meets the actual needs of construction, to ensure building construction safety. By exploring the impact of deep excavation on adjacent buildings, the paper makes the construction workers deeply understand the importance of deep foundation construction work.

Abstract: With the development of the construction industry, fire fighting equipment supply problems and their reliability has become a focus of attention. This paper analyzes how to supply power for fire-fighting equipments and to ensure its reliability according to the national standard, and describes the power supply requirements and solutions of fire fighting equipment.