Abstract:The design and construction level of power grids are increasing rapidly with the development of China's power industry. The tower of Transmission line has become an important forced fulcrum. Safety and economy are basic requirements of conventional structural design. However, making the transmission lines and the environment in harmony and unity challenges structural designers. In this paper, a new-type transmission tower--bamboo transmission tower is designed and researched on the basis of a practical project. It can be found that the new-type of transmission tower makes the tower and the environment in harmony and unity when it meets the safety and economy requirements.
Abstract. The progressive collapse of structures under accidental actions is a serious threat to the public safety. Numerical analysis of a 2x2-bay and single-story reinforced concrete flat plate frame model is done in this paper, the time of failure and the position of failure column are taken into account. It can be found that the Dynamic Amplification Factor (DAF) increases with the decrease of failure time, the DAF under compressive membrane action is less than the stage of the tensile membrane action and the compressive membrane action is more important to avoid progressive collapse. When the time of failure is not changed, the DAF is negatively correlated with the load under compressive membrane action and the DAF is positively correlated with the load under tensile membrane action.
The biotoxicity caused by focus releasing of Ag, which associated with the Ag loading mode, is a problematic issue that need to be solved for practical utilization of the keratin based wound dressing. In this study, keratin/AgNPs blend scaffolds (Ker/Ag) and keratin scaffolds with AgNPs attached on the scaffold’s wall surface (Ag@Ker) were prepared. Structure and physical properties of the scaffolds were tested and investigated. In comparison to the Ag@Ker scaffolds, the Ker/Ag scaffolds with uniform dispersion of AgNPs have larger tensile strength and slower degradation rate. Both kind of scaffolds present excellent antibacterial property with 10 μg mL−1 AgNPs addition, while the Ker/Ag displayed a linear Ag releasing ratio in the first 5–7 days, which is beneficial for obtaining a continuous antibacterial property and avoiding the biotoxicity caused by focus release of Ag. Correspondingly, cytotoxicity assay further reveals that the continuously slow release of Ag of the Ker/Ag scaffolds accelerated the proliferation of cell. Infectious animal models and histological studies showed that the Ker/Ag scaffolds can effectively inhibit the inflammatory response and accelerate epithelialization. Thus, it can be concluded that the Ker/Ag scaffolds with uniform dispersion of AgNPs are more attractive as wound repair materials.
Intrusion detection is a crucial technology in the communication network security field. In this paper, a dynamic evolutionary sparse neural network (DESNN) is proposed for intrusion detection, named as DESNN algorithm. Firstly, an ensemble neural network model is constructed, which is processed by a dynamic pruning rule and further divided into advantage subnetworks and disadvantage subnetworks. The dynamic pruning rule can effectively reduce the subnetworks weight parameters, thereby increasing the speed of the subnetworks intrusion detection. Then considering the subnetworks performance loss caused by the dynamic pruning rule, a novel evolutionary mechanism is proposed to optimize the training process of the disadvantage subnetworks. The weight of the disadvantage subnetworks approach the weight of the advantage subnetworks by the evolutionary mechanism, such that the performance of the ensemble neural network can be improved. Finally, an optimal subnetwork is selected from the ensemble neural network, which is used to detect multiple types of intrusion. Experiments show that the proposed DESNN algorithm improves intrusion detection speed without causing significant performance loss compare with other fully-connected neural network models.
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