To further study the location problem of the entrances and exits of the community, based on the shortest path algorithm to obtain the shortest distance between any two points. According to the actual situation of the community location, the proportion of parking spaces in different parking areas in a theme park is weighted analyzed by the method of proportion coefficient, which is used as the weight coefficients of each corresponding shortest path in the traffic network diagram. Finally, taking the minimum path weighted value of the vehicle into and out of the community as the goal, the location model of theme park gateway is constructed, and the location scheme of the community entrance and exit is determined. At the same time, the research on the location of the entrance and exit of the Dong daqiao community in Chaoyang district of Beijing is used as an application case of this algorithm, the result shows that using weighted shortest path algorithm to determine the community entrance and exit can minimize the distance cost of the vehicles, which can effectively save travel time, and improve the travel efficiency of the travelers.

With the continuous development of China's economy, the energy-efficient building and green building initiative of China has increasingly become the concern of people at home and abroad, inside and outside the industry. Firstly, this paper analyses and compares the application background of two green certification systems, LEED in the United States and GBES in China. Then, we study the annual number, regional distribution, level distribution and regional distribution of professional certification personnel of GBES and LEED certification programs. The results show that the number of green certification projects in China is increasing rapidly yearly, but there are some regional differences. The overall certification level is 2 star (gold level), and there's no match for the green program for the less qualified professional. Based on the above situation, this paper puts forward corresponding development suggestions. Firstly, on the basis of policy and financial support, the comprehensive development of green certification programs will be gradually promoted from the developed regions to the developing regions and from the south to the north. Secondly, we should promote the development of two-star (gold) certification programs with moderate incremental costs and good ecological benefits. Finally, it is necessary to fully introduce and increase the number of professional certification personnel and consulting agencies of certification.

The spatial interpolation method is of great sign ificance for the spatial distribution of heavy metals in soil and the prevention and control of pollution. However, different interpolation methods are applied to predict the accuracy of different heavy metal pollution distributions in small-scale areas with a single farmland. There is no relevant argument. Taking a farmland (96000m2) in Lanping County, Yunnan Province, Yunnan Province as the research object, 144 surface soil samples were collected and the contents of Pb and Cd in soil were determined by ICP-MS. The deterministic spatial interpolation method and geostatistical Kriskin interpolation method were used to investigate the accuracy of different interpolation methods and the distribution characteristics of Pb and Cd in soil. The results show that the optimal interpolation methods for heavy metals Pb and Cd in polluted farmland are 0-order ordinary Kristen interpolation method, and the content of Pb and Cd in the soil is relatively accurate. This study will provide important basic information for the identification of spatial distribution characteristics of different heavy metals in small-scale areas with a single farmland, which will help to comprehensively evaluate the function of spatial interpolation to identify spatial distribution information of heavy metals.

In the construction of the main beam of the PC plate type stiffening beam suspension bridge, the problem of tensioning construction of super-long prestressed steel bundles, combined with the Moon Bay Bridge with the main span of 465m, introduces the whole process of prestressed steel beam piercing and tensioning of the main beam. And the problems existing in the tension construction were analyzed. The construction of the Moon Bay Bridge was successfully completed, and its construction method can provide reference for similar bridge construction, which has certain reference significance.

In this paper, a simulation prototype of a high-power radioisotope thermoelectric generator (RTG) simulation prototype based on skutterudite is designed. By replacing the isotope heat source with an electrically heated heat source, its output power is 40 W under the condition of 1600 W electric power heating, and the thermoelectric conversion efficiency can reach 2.5%. The simulation prototype contains a total of 8 thermoelectric modules, and each module contains 16 pairs of thermoelectric materials. Its maximum theoretical output power can reach 66 W under the temperature of 550 °C. This research provides a leading guide and reference point for the temperature difference structure of RTGs at the hundred watt level.

For the cross-linked polyethylene (XLPE) cable health status assessment process, there are noise data for each feature parameter and the importance of each dimension feature is difficult to determine, which leads to deviations in the cable status assessment results. An XLPE cable health assessment algorithm based on Relief-F feature weighted fuzzy support vector machine is proposed. The Relief-F algorithm is used to calculate the importance of each dimension feature. The feature quantity that is weakly related to the evaluation of the health status of the XLPE cable is deleted. Furthermore, the fuzzy support vector machine is used to evaluate the health status of the XLPE cable, which gives the noise data a smaller degree of membership and reduces the influence of the noise data on the evaluation results. Experimental analysis shows that this method can accurately assess the health status of XLPE cables. It can provide a reference value for relevant departments to carry out cable maintenance and replacement work and save the human resources, and material resources required for maintenance and replacement of cables.