With the development of submarine oil and gas resources, people pay more and more attention to the safety of pipeline transportation. Once an oil and gas leak occurs in the submarine transportation pipeline, it will not only cause direct economic loss but also damage the marine ecology. Therefore, it is particularly important for underwater gas leak detection research. Due to the difficult underwater detection operation and the high labor cost, an embedded module with automatic gas leak detection function is designed and completed in this paper. This paper analyzes the imaging characteristics of multi-beam sounding sonar images, and designs a set of underwater gas leak detection algorithms. The algorithm mainly includes: median filtering, bottom detection, top-hat processing, maximum entropy image segmentation, connected area labeling, nearest neighbor interpolation based on backward mapping, linear upward trend estimation based on Hough transform, and testing of 120 images, With an accuracy rate of more than 98%.

Energy consumption in building sector remains high. Utilizing renewable energy in buildings can help to reduce the consumption of conventional energy. Through the research on the current standard system of public building design and related literature in China, this paper classifies the main standards involved in the common design process of public building. It aims to summarize the characteristics and shortcomings of renewable energy utilization in the field of public buildings in China, and put forward some suggestions. This paper presents the main technical contents and evaluating index system of the renewable energy utilization. It can be concluded that the practical existing problems are the weak connection between renewable energy utilization and architecture design. It is suggested that consideration of renewable energy application in the whole design process should be strengthened, and development suggestions of climate and site resource and energy conditions should be added.

Aiming at the problem of economic operation of multiple microgrids system, a coordinated optimized operation method of multiple microgrids in integrated energy system based on alliance theory was proposed. Firstly, energy storage station was introduced into multiple microgrids optimal scheduling, the energy flow relationship between various links was studied, and an economic optimal dispatch model was established under the alliance mode of multiple microgrids and energy storage station; Secondly, constructed a Shapely value benefits distribution mechanism to carry out the initial benefits distribution of the alliance and the secondary distribution of the multiple microgrids internal benefits. Finally, taking a typical daily scenario as an example, the optimal operation scheduling strategy of multiple microgrids with the participation of energy storage station was obtained. The results showed that the method proposed in this paper can effectively improve the benefits of all participants and ensure the economic operation of multiple microgrids, at the same time, it realized the full consumption of renewable energy.

There has to date been no quantitative analysis of the anti-sliding effects of protective measures implemented in high steep rockfill slope engineering under conditions of instability, despite the importance of this analysis for engineering design, improvement to engineering measures, and promotion of hazard warning and management. This study established a discrete element model (DEM) of a high steep rockfill slope based on an engineering project. Numerical simulation was used to investigate the anti-sliding effect of concrete retaining wall height on the high rockfill slope under conditions of instability, with a focus on the distributions of rock before and after slope instability, rock displacement, the quantity of rock crossing the concrete retaining wall, and the quantity of rock reaching the riverbed. The trajectory of rolling rock changes in velocity under different concrete retaining wall heights, and the resistance to rolling rock by the retaining wall were analyzed. Movement trajectories and velocity time-history curves of rolling rock suggested that a higher concrete retaining wall could enhance slope stability under long-term operation. Quantitative analyses determined the optimum height of the concrete retaining wall. The method proposed in this study could provide guidance for effective protective measures in high steep rockfill slope engineering.

In this study, experimental investigations on photovoltaic (PV) façade systems were conducted to study the electrical power generation in three typical cities in East China. The window glass consists of 6mm thick semi-tempered glass, polyvinyl butyral (PVB)/ethyl vinyl acetate (EVA) film, solar cells, PVB/EVA film, and 6mm thick semi-tempered glass. The walls are made by insulation yanmian with an inner thickness of 12 mm. Test facility was established in Beijing, Wuhan, and Guangzhou, respectively. The building process and test details were introduced. The current-voltage (I-V) curve and the power-voltage (P-V) curve of the present PV façade were obtained and the voltage corresponding to maximum power point (MPP) is 17 V. Daily, monthly, and yearly electrical power generation in the three cities were obtained to show all-around PV performance in East China. Beijing has the maximum power output (∼180 kWh) for horizontal panels, larger than those panels faced at south direction. While in Wuhan and Guangzhou, the maximum power outputs only are ∼140 kWh also with horizontal panels. Besides, it also discovered that orientation is the key parameter in Beijing and Wuhan, while orientation is not the key parameter in Guangzhou.

In this society where resources are increasingly scarce, the microgrid is developing rapidly in anticipation, due to the random energy storage characteristics of electric vehicles, the integration of electric vehicles in the microgrid is of great significance to suppress the volatility of new energy. In this paper, a microgrid model of renewable energy, energy storage equipment, micro-turbine and electric vehicles is established, and the impact of time-sharing electricity prices on system operation is fully considered., With the operating cost of the microgrid system and the cost of environmental pollution control as the goal, use the improved NSGA-II to solve. The effectiveness of the proposed microgrid optimization model is verified through analysis of examples, and compared with the standard genetic algorithm algorithm to solve the model. The results show that the improved algorithm can effectively improve the algorithm's operation efficiency and optimization ability, and in the microgrid Access to electric vehicles can also reduce environmental pollution and reduce the cost of operating microgrid systems.