Search

Hydrologic responses to climate change have become a great challenge and attracted widespread attention of the researchers. The mountainous Qingyi River watershed in the southwest, China, had experienced significant climate change in the past three decades. It is necessary to investigate the hydrologic responses to these changes. Therefore, the effect of climate change on evapotranspiration (ET), surface runoff, baseflow and streamflow were assessed using Variable Infiltration Capacity (VIC) hydrologic model. The Mann–Kendall test analysis was first used to identify the long-term change in precipitation and temperature over the period of 1980–2010. It revealed that there is a significant change in annual temperature particularly in February, March, July and September, whereas an insignificant change in annual precipitation was founded. Hydrologic simulations show that hydrologic responses to climate change were varied from region to region. Surface runoff was more sensitive than ET and baseflow. Monthly variation of the hydrologic processes, especially the change in surface runoff, was mainly attributed to seasonal variation in precipitation. The results of this research can be a useful source of information for the decision making in water resources management and protection.

The measure of similarity is an essential basic work in the field of pattern recognition, machine learning and data mining, etc. The shape similarity distance (SSD) which considering vector difference factors in the calculation of similarity, is an amendment of the classical distance. Based on the classical Euclidean distance, Manhattan distance and the SSD, this paper completed the clustering on the multiple datasets that contained shape features data of objects. The experimental results indicated that compared with the classical distances, the SSD can consider the characteristics of shape of theses objects to estimate their similarity.

The research makes a heat balance test for the radiator system of the analog power capsule. And it also raises a correction calculation method of the fan in the closed cooling heat balance system for special vehicle and proves it by simulation. The research setting up the simulation test bed of the cooling system, conducting the heat balance test and verifying the validity of the carload test bed. Finally, the closed cooling air volume control precision and accuracy of the measurement system can meet the requirements of engineering application

In general, reinforced concrete frames have excellent fire resistance properties, but more and more concrete buildings collapsed in fires. The majority of past research work on the response of concrete building to fire has looked at the effects of fire upon individual structural members, and most commonly when subjected to heating from standard fire tests. At present, the fire behaviors of whole reinforced concrete frame are not adequately understood. There is a great need for development of models which consider the effects of fire on the whole structure under more realistic heating regimes. There is also a fundamental requirement for further large-scale testing of concrete structures, to observe the behavior of whole concrete structures in real fires and also for validation of advanced computer analysis tools. Accuracy and efficiency are two major concerns in finite element analysis of structural response of concrete frames in fires. In this paper, a multi-type finite elements hybrid model for simulating structural behavior of whole reinforced concrete frames in real fire is suggested.

By adopting coating damage simulation research method with open circuit potential and electrochemical impedance spectroscopy, the influence of different damage levels of green organic composite coating to its protective performance has been studied. The research found that the variation of open circuit potential partly reflected the damage level of the coating. When K is less than or equal to 0.04, the coating still has favorable protective performance, while K is higher than 16, the protective performance of the coating is basically unavailable, but when K falls in between, the protective performance of the coating is fair good.

In the power electronic circuits, AC chopping control voltage regulation circuit through change the chopped device conduction time, it can easily change output voltage size. Load currents do not include low-order harmonic, they contain only higher harmonic which are relevant to the switch period , they are easy to filter out. So the power efficiency is high and it is characterized of high performance. This paper introduces a kind of widely used AC chopping control voltage regulation circuit and we simulate it by simulink. The result fully embodies the superiority of this kind of circuit.

Currently, there is a very difficult problem in coal mine, such as labor intensity and the problem of low safety factor. On the basis of the monorail load form, Roadway drivage support platform to achieve the comprehensive the integration of tunneling work platform of auxiliary transportation and roadway drivage support work.