The heat transfer characteristic of typical thermal bridge is tested, and numerical simulation is carried out by ANSYS finite element analysis software. The accuracy of two-dimensional heat transfer numerical simulation method is verified through comparative analysis. It can be seen that the temperature simulated values of each measuring point are consistent with the variation trend of the measured values, and the temperature deviations are not more than 10%. This shows that the finite element numerical simulation method can accurately analyze the two-dimensional heat transfer characteristics of the thermal bridge.

In this paper, the construction technology of new cast-in-situ phosphogypsum wall is studied through pouring tests of different wall types, and the pouring operability, accuracy and efficiency of the new wall is evaluated. The results show the surface smoothness and vertical deviation of cast-in-situ phosphogypsum wall are determined to be 3-4mm. The construction efficiency of cast-in-situ phosphogypsum wall is about 6-7m 2 /h, which realizes high-precision and high-efficiency construction of wall. The technology of cast-in-situ phosphogypsum wall provides an effective method for the resource utilization of industrial solid waste and the large-scale innovation of wall materials.

In recent years, blackouts caused by extreme weather show a trend of frequent occurrence. This paper analyses the external causes of blackouts, summarizes the evolution process of blackouts, discusses the internal causes of blackouts in power system, analyses the challenges faced by power system under the superposition of extreme weather and renewable energy, and finally puts forward some suggestions for the planning of high proportion renewable energy power system.

Full-polarimetric ground penetrating radar (GPR) can obtain more comprehensive polarization data (called VV, HH, VH) for the same target than traditional commercial radar (only VV). We need to use data fusion technology to combine the polarization information of the three different polarization modes. However, the full-polarimetric GPR data fusion method has one weighted average fusion, which will mask the advantages of full polarization. Principal component analysis (PCA) is a technology of data dimensionality reduction and compression which can use VV, HH and VH as a three-dimensional data to conduct data dimensionality reduction and find the best data fusion results. In order to check the reliability, we obtained the full-polarimetric GPR data of three typical targets in the laboratory for analysis. Then we compare PCA with the weighted average fusion method by using the instantaneous amplitude and conclude that PCA can fuse full-polarimetric GPR data better than weighted average fusion.

With the deregulation of power industry and increasing penetration of distributed energy resources, the study on the optimal schedule of demand-side resource under the electricty market environment has attracted wide attention from academia and industry. In this study, a market-based operational framework for cluster smart buildings is proposed. On this basis, a day-ahead optimal scheduling strategy and model for cluster smart buildings considering the overall power balance and consumer preferences and behaviors is proposed. The smart building energy management system comprising photovoltaic, electric vehicles and thermostatic controllable loads aims to minimize the total energy procurement cost. And then, the numerical results indicate that the proposed scheduling model can achieve local power sharing in the smart community. Finaly, the optimal scheduling results under consideration or no consideration of the transformer power limit are discussed.

The object of this work was to improve fireman's fighting efficiency for winter rescue. Firstly, relative standard and background of fire protective clothing for rescue was reviewed. Secondly, different types of clothing were studied according to different structure. Thirdly, fire protective clothing with anti-icing performance and thermal retention performance for rescue was designed. Further study should focus on the new clothing's actual application in northern east fire brigade.