Papers by Keyword: Effect Factor

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Authors: Hai Yan Zhang, Jian Bo Yu, Xian Hua Chen
Abstract: Localized flaws such as corrosions in petroleum pipelines often cause fragility, impairing integrity and shortening service lifetime of the structures. There has been much interest recently in monitoring the integrity of the pipe structures. Ultrasonic guided waves provide a highly efficient technique for rapid pipe inspection because they can be made to propagate significant distances in pitch-catch configurations. Crosshole tomographic geometry is formed in such pitch-catch configurations when transmits and receivers are respectively laid along two parallel circumferential belts around the pipe. Considering the pipe as an unwrapped plate, we investigate the adapation of the tomographic reconstruction in seismology to the guided wave inspection of a pipe. Various effects such as transducer arrangement, mesh precision, sampling interval and iterative algorithm on tomographic reconstruction are analyzed. The results provide a theoretical basis for quantitative detection of pipeline flaw using guided wave tomography.
Authors: Hai Jun Xie
Abstract: Chemical fertilizer is an important agricultural product resource, is food supplier’s food. Fertilization scientific and reasonable is an important condition to stabilize output, increase output and benefit. This paper researched the factors affect quality of chemical fertilizer use correlation and econometric analyse. The result is that chemical fertilizer import quantity and fertilizer quality of one period of time delay and the price of chemical fertilizer effect fertilization differently.
Authors: Bo Zhang
Abstract: Duncan—Chang constitutive model is widely used for it reflecting the main property—nonlinearity of soil. In the paper, the geotechnical Duncan—Chang constitutive model is introduced into ANSYS software by using the User Programmable Features (UPFS) of ANSYS. The calculation results with eight parameters variation in Duncan—Chang model are analyzed, which has much wider reference value for geotechnical engineering problems. The relative solution methods provide important reference for other constitutive models to be introduced into and analyzed in ANSYS program.
Authors: Wei Min Wang
Abstract: Polymer electrolytes since the 1970s, the PV Wright, PEO polymers and inorganic salts can form complexes with high ionic conductivity. Thereafter, on a global scale, set off a craze of the theory with solid polymer electrolyte materials research and technology development, a lot of research work has been in the field to start and made great achievements in the preparation and study of different substrate materials composite polymer electrolytes, the most promising as lithium solid electrolyte materials. The polymer matrix itself large to have a high degree of crystallinity, this is very unfavorable to ion transport, therefore, to try to expand the ion transport required for the amorphous region and increase the migration of the polymer chain, and the electrolyte conductivity the rate is not only related with the polymer matrix, but also by the factors of the salt type and concentration of organic plasticizer and nano inorganic filler types and add methods.
Authors: Hai Jun Zhao, Hai Xia Wang, Jia Dong Chang, Qi Li, Li Ping Tian
Abstract: Using orthogonal experimental design method structure parameters of work piece for muffler element with inserted tube are determined. Flow noise regeneration of them is measured on the self development test bench. Relationship model on total sound power of flow regeneration noise and structure parameter and flow velocity is established utilizing Multiple linear regression method, model parameters are solved making use of hyper static least square method. Significance test of the model is performed, the law of total sound power level for muffler element flow regeneration noise changing with the parameters is discussed. Result shows that the established models is all highly significant under 0.01 levels, and inserted length of outlet tube and inn-diameter of inlet tube have higher effect on the flow generation noise, and decreasing the inserted length and the inn-diameter are in favor of reducing flow generation noise. But inserted length of inlet tube and expansion ratio have little effect on the flow generation noise.
Authors: Hai Jun Zhao, Zhao Xiang Deng
Abstract: Flow noise regeneration from perforated tube muffler element was measured on the self-developing test bench, relationship model on total sound power of flow regeneration noise and structure parameters and work condition was established. Its model parameters were solved making use of hyper static least square method. Using the model effect factors of flow noise generation were discussed. Result shows that the reducing of the perforated diameter and the perforated part length is favor of the reduction of flow noise, and perforated ratio and expansion chamber diameter have less effect on flow noise. After analyzing spectrum structure of flow regeneration noise, it is displayed that with the increase of flow velocity projected peak value frequency has the trend of moving to middle and high, its intensity also becomes stronger, and sound energy in some the frequency accounts for about 60% of the total energy, Strophe number is the range of from 0.2 to 0.35.
Authors: Yih Shan Shih, Liang Ting Tsai, Chih Chien Yang
Abstract: The goal of this study is to explore the factor effect of learning vector quantization. The manipulated factors are training pattern, learning rate, types of mixed data, and hidden node. The results showed that the average accuracy for severe overlap data was significantly lower than for those of slight and moderate overlap data. The worst classification accuracy was found for mixed data with learning rate equals to 0.1; whereas the best classification accuracy was found when the number of hidden nodes and output categories are equal. As a result, the classification accuracy increased as the number of training patterns increased. Conclusions and discussions are provided for practical guidelines.
Authors: Ying Yue, Lu Si Zhang, Jie Ding
Abstract: Continuous dark fermentative hydrogen production technology is suitable for commercial application. This review summarized several main basic factors influencing the operation of the reactor, followed by some suggestions and outlooks. The factors included temperature, pH, HRT and COD were briefly introduced and discussed. This review demonstrated that the optimal value of a given factor under different conditions was great different. This indicates that reactor operation is affected by many factors and sensitive to environmental change. To make the technology more feasible into practice, deeply understanding about the characteristics and rules of the operation is necessary. Thus more researches in this respect are recommended.
Authors: Jian Zhao, Jing Lan Hong, Chun Yuan Ma, Qing Song Wang
Abstract: In the present study, polycyclic aromatic hydrocarbons (PAHs) toxicity of lignite burning was investigated. Results showed the emissions of benzo [a] pyrene, benzo [a] anthracene, Fluoranthene, and dibenz [ah] anthracene were the dominant substances contributing to the PAHs potential human toxicity impact. By contrast, the substances of Naphthalene, Acenaphthene, Acenaphthylene had the most important contributing to the overall PAHs emissions. These results indicate that high PAHs emissions are not necessarily results to high health impact. The health toxicity generated from lignite burning are significantly affected by the air input volume and the diameter of used lignite. The lowest PAHs emissions and highest health impact caused by PAHs were observed when air input is 2 m3/kg-lignite and 2.5m3/kg-lignite, respectively. In addition, an increasing tendency of PAHs toxicity with an increase in diameter of lignite for both emission and impact were observed.
Authors: Bing Liu, Zhi Wei Wang, Yu Bin Zhou
Abstract: It is found that the use of pedestrian streets varies widely in Chinese cities. This paper was intended to compare the pedestrian behavior characteristics and to discuss the effects of market competition, built environment and mobility governance of walking streets, taking three cases in Wuhu city for study. Except pedestrian flow, trip purpose, trip frequency, travel distance, dwelling time and mode share was compared based on sampling questionnaire survey. It further investigated pedestrians’ satisfaction and dissatisfaction with the streets, as well as main factors affecting pedestrians’ behavioral preferences, including the scale and types of business activities, landscape, circulation and transit service of the streets. The author concludes that market comparative advantage, pleasant walking environment and good transit accessibility are keys to enhancing the vitality of walking streets.
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