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.

The impact of hydropower projects on the ecosystem is dynamic and complex. Constructing a complete ecological compensation mechanism can ensure the effective progress of ecological compensation. The ecosystem service value of the Fengjiashan Reservoir such as water supply, fish farming, hydropower, water regulation, water resources accumulation, biodiversity, and environmental purification, is calculated with market value method, alternative engineering method and other evaluation methods, and the ecological compensation mechanism of the reservoir is studied. The results show that the value of its ecosystem services is 230,912,700 yuan, and the amount of ecological compensation determined on the basis of ecosystem service functions is 101,866,200 yuan. The main sources of compensation funds are taxes, water surcharges and government financial subsidies.

In working conditions such as night construction sites, the supplement of high-altitude light sources is an important guarantee for the smooth progress of the project. In the actual use of high-altitude lamp, it is necessary to check according to load conditions and wind load forms to prevent the slender high-altitude lamps from being harmed due to instability. By applying wind load and gravity load on the lighting platform, this paper used finite element analysis software to simulate the operating conditions of the inflatable high-altitude lamp; selected the airbag configuration model to analyze the force form of the inflatable high-altitude lamp, gave the reasonable range of inflatable lamps used under various load forms, and predicted the failure modes under various loads.

The majority of lost circulation events during drilling include drilling fluid losses through natural or drilling-induced fractures, but this problem can be prevented by understanding fracture propagation behavior. However, studies have mostly focused on the influence of natural fracture and bedding planes on hydraulic fracture propagation, and few studies have explored the fracture propagation in the vicinity of a borehole. Therefore, the present paper intends to simulate the fracture propagation in the vicinity of a borehole under the joint impact of heterogeneity, natural fracture, bedding planes, and borehole. The theoretical model of flow-rock failure process analysis 2D was introduced, and the uniaxial compressive testing results of Longmaxi shale were obtained to verify the present model. Then, fracture propagation models in the vicinity of a borehole were proposed by considering heterogeneity, bedding planes, and natural fracture. Numerical findings were analyzed and discussed. Results indicated that heterogeneity, bedding planes, and natural fracture significantly influenced fracture propagation in the vicinity of the borehole. As such, this influence should be considered in the analysis and treatment of lost circulation. This study could help elucidate how lost circulation could be prevented during drilling in fractured formations.

In this paper, three test models were cast about the grid -tube- type double steel plate and infilled concrete composite shear wall, the horizontal low cyclic loading test was carried out, and hysteresis curves and skeleton curves were got under different coaxial compression ratios. The results show that the new composite shear wall has many advantages, such as full hysteresis curve, high bearing capacity, high ductility and high energy dissipation capacity. Under the large displacement angle of 1/25 and cyclic loading of 80 times, the plastic hinge area still maintains the large stiffness and bearing capacity, which can effectively prevent the collapse of the structure under the action of a major earthquake. New composite shear wall has good seismic performance, which can realize the design requirements of high axial compression ratio, high ductility and thin thickness walls.