Search

Cable-membrane structures have small rigidity and are highly sensitive to wind. Structural health monitoring is necessary to ensure the serviceability and safety of the structure. In this research, the design method of a structural health monitoring system is using the characteristics of a cable-membrane structure. Taking the Yueyang Sanhe Airport Terminal as an example, a finite element model is established to determine the critical structural components. Next, the engineering requirements and the framework of the monitoring system are studied based on the results of numerical analysis. The specific implementation of the structural health monitoring is then carried out, which includes sensor selection, installation and wiring. The proposed framework is successfully applied to the monitoring system for the Yueyang Airport terminal building, and the synchronous acquisition of fiber Bragg grating and acceleration sensor signals is implemented in an innovative way. The successful implementation and operation of structural health monitoring will help to guarantee the safety of the cable-membrane structure during its service life. [ABSTRACT FROM AUTHOR]

The insensitive main charge explosive is creating new requirements for the booster pellet of detonation trains. The traditional cylindrical booster pellet has insufficient energy output to reliably initiate the insensitive main charge explosive. In this research, a concave spherical booster pellet was designed. The initiation capacity of the concave spherical booster pellet was studied using varied composition and axial steel dent methods. The initiation process of the concave spherical booster pellet was also simulated by ANSYS/LS-DYNA. The results showed that using a concave spherical booster allows a 42% reduction in the amount of explosive needed to match the initiation capacity of a conventional cylindrical booster of the same dimensions. With the other parameters kept constant, the initiation capacity of the concave spherical booster pellet increases with decreased cone angle and concave radius. The numerical simulation results are in good agreement with the experimental data. [ABSTRACT FROM AUTHOR]

Abstract: A feeding trial was conducted to determine the optimum dietary protein requirement of a new Japanese strain of juvenile Chinese soft-shell turtle, Pelodiscus sinensis. Five iso-energetic diets were formulated to contain graded protein levels of 340, 370, 400, 430 or 460gkg−1 diet and fed to triplicate groups of turtles (mean initial weight, 3.70±0.05g) for eight weeks. The turtles were reared in 350-L indoor plastic containers (15 turtles/container) provided with aerated freshwater. For each graded increase of dietary protein up to 430gkg−1 diet, growth performance of the soft-shell turtles increased significantly. No further growth increase was observed beyond this dietary protein level. The highest feed efficiency and protein productive value were observed in P. sinensis fed the 430gproteinkg−1 diet. In general, the apparent digestibility coefficients (ADC) of dry matter, crude protein and gross energy increased significantly with increasing dietary protein levels. No significant differences were observed in the ADC of crude lipid among all experimental groups. Turtle whole-body protein content increased significantly from 15.2% to 16.8% with a corresponding decrease in moisture content (75.5% to 74.2%) when fed increasing dietary protein levels. The lowest concentrations of serum protein and cholesterol were observed in turtles fed 340 or 460gproteinkg−1 diet. Aspartate transaminase activity in turtles fed 340gproteinkg−1 diet was significantly higher compared to those fed 400 or 430gproteinkg−1 diet. Broken-line regression analysis indicated that juvenile P. sinensis (Japanese strain) requires 422.0gproteinkg−1 diet for optimum growth. [Copyright &y& Elsevier]