Papers by Keyword: Influence Factor

Abstract: The anchorage force loss of the prestressed anchor rope results in reduction or loss of anchorage force, which poses an enormous threat to the project safety. In the conceptual design process, factors like the system , structure, spacing and tonnage of anchorage, and properties of rock and soil should be considered and measures should be taken to effectively control or reduce the effect of the anchorage force loss, which possesses great theoretical and practical significance on the design, construction , safety and social-economic benefits of the anchorage project. Finally, the validity and reliability of design measure was proved by an engineering example.

Abstract: Vertical ultimate bearing capacity of static pressure pipe pile is influenced by comprehensive factors, such as pile body, soil around pile and construction conditions., and the relationship between the impact factors and ultimate bearing capacity of a single pile is highly complexity and non-linear. This paper is based on collecting the data from static load tests in typical geological conditions of Liao-shen area, construction records, and test pile sites. And then combine analysis of principal component with SVM to analysis the prediction of the single pile’s vertical ultimate bearing capacity. This model can reduce the number of SVM input variable dimension to improve speed of training support vector effectively. At the same time it can eliminate the influence factors of multiple correlation. The results show that the proposed principal component analysis SVM model has good predictive accuracy and generalization ability, and opens up new avenue of research for analysis of static pressure pipe pile vertical bearing properties.

Abstract: Constructed wetlands are new sewage treatment technology, which have advantages of good decontamination effect, low operating costs and easy maintenance. Base on analysis of constructed wetlands composition and purification mechanism, the constructed wetlands purification influence factors are summarized, and the problems and solutions of constructed wetlands are pointed out. Carrying out in-depth study on constructed wetlands design, operational control and maintenance management to improve comprehensive benefits of wetland sewage purification technology, have great practical significance and far-reaching social significance.

Abstract: In this paper Yuan River was taken as an example of the southern river, and Taizi River was an example of the northern river. Based on the contents of ammonia nitrogen, total nitrogen, total phosphorus and COD in the sediments, the distribution of pollutants in the sediments along the Yuan River and Taizi River were analyzed; When the pollutant contents of individual sections were particularly higher, the pollution sources were studied; Through the contrast of pollutants contents in sediments between Yuan River and Taizi River, the contents of Taizi River were higher 2-5 times than Yuan River. Then the causes were summarized from temperature,hydrological condition, discharge of industrial and domestic wastewater and sand contents.

Abstract: Establish the land evaluation model of Xiamen by means of BP neural network theory, taking 2007-2009 land evaluation cases of Xiamen as examples. Through statistical analysis, we find that the neural network which has 9 net work hidden layer nodes and 19% of maximal error index is more suitable for Xiamen land price assessment than others. Empirical analysis shows that the model has a good generalization ability, which can be used for land evaluation practices. The results indicates that the properties of autonomous learning of BP network can reduce the subjective factors of appraiser in land evaluation , also, the network has the advantage of simple and quick calculation.

Abstract: Through the pavement runoff monitoring of USST（the University of Shanghai for Science and Technology） courtyard pavement runoff and JunGong road runoff, the analysis of main influence factors and pollution degree, this article indicate that underling surface, rainfall duration, rainfall intensity and rainfall are important influencing factors of initial runoff water quality. Organic and suspended solid are the main pollutants of urban runoff. COD, SS and turbidity are the main pollution index, and they present exponential change law and finally achieved stability along with the delay of rainfall. The more heavily it rains, the more quickly water quality become stabilization. Stable water quality are influenced by rainfall character and pavement character. The more heavily it rains, the better stable water quality is. The more dust pavement contain, the worse stable water quality is. Stable water quality of courtyard pavement runoff are better than street runoff.

Abstract: Urban spatial form has recorded the history of city development, and also reflected the variations of urban spatial form characteristics. The thorough research and think on the influence factors of urban spatial form and pattern may help us understand the historical background of cities development and forecast the future development of urban space better. In this article, the reasons and influence factors of Chengdu, such as water system, special road system, functional lands and a whole-new model of coordinating urban-rural development, were discussed. We tried to find a way to control the out-of-order sprawl of urban development in Chengdu and promote the urban development towards a more sustainable direction.

Abstract: In this study various factors of the new type low temperature zinc phosphating process were studid to the film-formed. This was perfected the phosphating process conditions, and caused the phosphate film performance to achieve the best.

Abstract: Via the single-factor experiment for the seed dispensing performance of the metering disc, the main factors that affect the seeding performance are determined. Then, the important order, the optimization level, the optimal combination, and the priority level of the test factor are confirmed by taking the orthogonal test for the seed dispensing performance of seed metering disc. Following the single factor experiments and the orthogonal tests, the general rotation union design experiments are taken, and the mathematical models between the dispensing performance indices and the main factors are developed, which establish a foundation for further parameters optimization.

Abstract: In vehicular ad hoc network(VANETs), it is crucial for obtaining more accurate position information which variation rules between “distance-loss” model influence factors and distance measurement error is analyzed. Based on qualitative analysis of “distance-loss” model, field experimental scene and scheme are proposed. Using experimental sample data, the relation of environmental factor and shelter factor and distance measurement error is studied quantitatively. The experimental results show that distance measurement performance of optimized “distance-loss” model is significantly improved, and 6.7% is the largest reduction proportion of distance measurement error.