Abstract. The accessibility index is designed by using the inverse of time distance and population weighted average value to research the city accessibilities in a region, with the definition of time threshold, which not only considers the transportation characteristics of each segment in the region, but also effectively reduces the digital effects from measurement on the analysis results, makes the analysis result could better reflect the reality at the same time. The results show that the Henan highway traffic network is relatively perfect, basically have been forming a high speed transportation system with the provincial capital, Zhengzhou, as the center. The city accessibility indexes in Henan province show the characteristics of normal distribution, the Accessibility differences are relatively obvious, the regional distribution of highway is very unbalanced. The accessibilities have high-high and low-low aggregation phenomenon, the Accessibility along the north to South and northwest to southeast direction becomes worse; the accessibility distribution and population distribution exist obvious departure.
The express traffic system could divide into highway traffic system and ordinary road traffic system, which have different linkage attributes and traffic attributes for segments and nodes. The time consumption space of traveling in the system is a non-Euclidean distance space. From the traffic condition of the express traffic system, the foundation data, principles and methods of NEDS algorithm are introduced. The steps and methods of optimum route planning in the express traffic system are deeply discussed. At the end, an example of optimum route planning in Henan express traffic system is given.
Based on the traffic network in Henan province, the accessibility index is designed by using the population weighted average of inverse of time distance to evaluate the influence of the high-speed railway system on the city accessibilities, and the perfection degree of highway traffic system in the region. The results show that by the early 2016, the accessibility indexes generated by the highway traffic system have the characteristics of normal distribution with relatively obvious differences between cities and relatively unbalanced distribution pattern. The construction of high-speed railway has largely improved the city accessibility levels along the railway lines, makes overall provincial accessibility increasing more than 33.51 percent, and shortens the distance between the accessibility center and population distribution center. However, there is still long distance between them, as the southeast and southwest part in the province with very poor accessibility levels, which should be improved by further perfecting the highway traffic system in these areas in order to maintain a balanced regional economic development.
This paper used the methods of hydrochemical data logging, in-situ titrating , collecting the Source spring samples and the atmospheric samples in the water, by analysis their geochemical characteristics, to distinguish the source of sediment at Huanglong valley in Sichuan. The research shows the gas in the Haunglong Spring water is mainly from deep earth, which contains the inner earth information, instead of atmospheric or biogenic origin. Meanwhile, the research also shows the travertine deposited samples in the deep groove of earth contain a lot of information about the tectonic movements such as earthquakes , volcano activities and so on.
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