For the problem of leakage frequently occurred in the seal of metal bellows in tar pump used in chemical construction,the analysis from two aspects,the working condition of the pump and seal structure,was carried out in this article.The mechanical seal in tar pump was reformed by using dry gas seal,and then the detailed reform scheme was presented.In this way,the problem of leakage occurred in the seal in tar pump had been solved.The method can be referenced in the application of dry gas seal in the condition of high temperature,serving high viscosity or easy solidifying fl uids.
At present, China's economy is developing rapidly, and the problem of traffic congestion is becoming more and more serious.This paper designs an intelligent traffic light system, which can effectively alleviate the traffic inconvenience.Firstly, the paper introduces the whole design idea of the traffic light system, and then designs the three modules of the traffic system, including the vehicle detection module, the traffic control module and the signal display module.The simulation results show that the system can provide the intelligent technical solutions for the urban traffic light control system.
A micro-level input-output analysis of farming fields is important in understanding the human-land relationship in rural area,particularly in the mountain area.This paper makes a survey of the attributions and the input-output characters of 482 plots of farmland from 81 households in Wugou village.The data includes 50 properties for each plot.Then the paper points out that the elevation is an important factor which influences the inputs,outputs and the ratios of output to input on the cultivated land in mountain area.Along with the elevation of the farmland plot being added,its average area is tending to be gradually shortened.For example,the average number of farmland plots per household increases from 1.35 to 3.65.In the varied curve,the number of energy input of farmland system is descending with the increase of the altitude of the farmland plot,whose influence factors include the distance between the peasant habitation and the farmland plot,the natural environment around,the domestic policies of reforestation,the behaviors of households and so on.The factor of the elevation is more important in the course of output energy in farmland system.In the?drought?flat?cultivated plot,the elevation of the plot is ascending from 568 m to 673 m;the average production of wheat is descending from 246 kg to 193 kg,that is to say,its average production is descending 5 kg when its elevation raises 10 meters.And the elevation of the plot of the corn is also ascending as same as the plot of the wheat,its average production is descending from 310 kg to 210 kg,that is to say,its average production is descending 9 kg when its elevation raises 10 meters.The ratios of output to input of the drought plat farmland are higher than the sloping one,but its form of their situations is different from the angles of varied crops.After the precise calculation,the former is 1.4 times than the later when the cultivated plot is planted the wheat,and 1.6 times when it is planted the corn,and 1.1 times when it is planted the bean.It is an important approach to improve the ratio of output to input of cultivated land in the mountain area by changing the irrigation works of farmland.
This paper researches on the effect of China Second Board Market on the economic growth difference between regions,and properly drawn conclusion that the development of Second Board Market reduces the difference.In this paper,we observe that the economic growth difference between regions has been enlarged before 2004 while diminished since 2006,during which time period the Second Board Market has been just started.This phenomenon just happens coincidently,or there is some inevitable connection between these two things? This is what this paper concerns. First of all,we review the related papers on the economic growth between regions,and know that most papers have researched the difference change of 1980s and 1990s,only one paper talk about the difference change from 2004 to 2006.Meanwhile,all these papers have not research this topic from the aspect of stock market.Thus this paper has its own meaning in some degree.But how do we answer this question? Theoretically we prove that the Second Board Market has the potential ability reducing the economic growth difference between regions with the basic thought from AHM model(2005) and MLL model(2010).As a part of financial market,the development of Second Board Market can promote development of financial market,which always can affect production activities positively by every means,especially in the way improving the information dissymmetry problem.Due to this improvement,the firms depreciated incorrectly now can finance more capital and grow faster than before.A lot of these firms are located in mid-west areas.Therefore,the development of Second Board Market maybe promote the middle and west areas more,by which it reduces the growth difference between regions. The latter part of this paper answers this question by empirical model.Firstly we set the measurements of Second Board Market and the difference between regions,then we discuss the correlation between these two variables,and find that these two variables have negative correlation.By testing the non-Granger Casualty test,the one way casualty from Second Board Market to diminishing of the growth difference is proved.After that step,we achieve the long-term relationship between these two variables with Bounds Testing Approach and ARDL model.All these empirical tests support the theoretical results. But what is mechanism of this result? We take a try to explain this in a way of the capital relocation with provincial panel data.Apparently,since 2005 the fixed asset investment rate in the mid-west area is higher than east china,so is the growth rate.Therefore,the growth difference between regions diminishes. All these steps basically support the conclusion that the development of Second Board Market reduces the economic growth difference.But in later research we need focus more on details in provincial economic structures,which is totally worthy of explain this question completely.
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