The study aims to explore the scheduling plan for the emergency of blockchain technology in the medical industry. Network security architecture for medical supplies management based on the Hyperledger Fabric optimized consensus mechanism is established by studying the characteristics of blockchain technology and its data structure composition. The supply chain model for medical device scheduling based on intelligent contracts is selected for the particularity of the nature and shape of medical devices in medical supplies. Ant colony algorithm is used to solve it. Case analysis and verification results show that the improved Hyperledger Fabric consensus mechanism has better security performance. Under the condition of 10,000 transactions, the probability of an attacker with the optimized consensus mechanism successfully controlling the transaction is only 7.2%. The optimized solution is about 50% higher than the original solution in terms of transaction processing speed. Over 1000 transactions, the transaction latency optimization rate is more than doubled. The total order completion time of the medical device scheduling model adopted by the intelligent contract is 26.3% higher than the historical service time of 19 days. The performance of the medical emergency material scheduling program that is added to the supply chain technology is better.

The gradual development of coal mining in deep areas has brought new challenges to the surrounding rock support system. It is imperative to design surrounding rock support elements that exhibit strong tensile and shear resistance and are suitable for pretension load. In this paper, an anchor cable bolt with a c-shaped tube (ACC) is proposed, and in order to study the shear performance of the ACC, the mechanical properties of the ACC and ordinary cable bolts with various diameters and pretension loads are tested. In addition, a comparative analysis is performed to investigate the effect of diameter and pretension load on the shear strength of the ACC and cable bolts. The results show that compared with ordinary cable bolts, the ACC exhibits better shear resistance, where its ability to withstand transverse shear load and shear deformation increased by more than 26.8% and 7.0%, respectively. The diameter and pretension load of the bolt significantly affect its shear performance. The larger the diameter of the bolt, the greater the peak shear load. By increasing the pretension load, the shear load and shear displacement at the peak shear load decrease. The failure of the ACC and ordinary cable bolt is mainly due to a combination of shear and tensile failures. In addition, the action mechanism of the ACC is preliminarily explored, and it provides some references for clarifying the mechanical properties of the ACC.

No abstract

No abstract

To inhibit the destructive evolution of the HfB 2 -SiC coating during oxidation, La 2 O 3 was added to modify the oxygen-blocking capability of the HfB 2 -SiC coating. The effect of La 2 O 3 content on the oxygen barrier capacity of HfB 2 -SiC was investigated. The addition of 5 vol.% La 2 O 3 lowered the oxidation activity and strengthened the inert oxygen barrier capacity of the HfB 2 -SiC coating, which made the oxygen permeability and maximum weight change rate of the coating decrease by 30.32% and 73.97%, respectively. Due to the solid solution reaction of the dispersed La 2 O 3 , HfO 2 , and SiO 2 nanoparticles, a stable Hf-B-La-Si-O multiphase glass was formed on the surface of the coating. Besides, the highmelting-point particles, such as HfO 2 , La 2 Hf 2 O 7 , and HfSiO 4 , dispersed in the glass layer as hard particles and formed a mosaic structure based on the Hf-B-La-Si-O compound, which increased the cumulative protection efficiency of the HfB 2 -SiC coating to 98.5% and reduced the inert factor value by 84.57%. However, the excessive consumption of SiO 2 glass by La 2 O 3 results in dendritization of the generated glass when the La 2 O 3 content is above 10 vol.%, which reduced the self-healing capability of the generated glass and instead weakened the oxygen barrier properties of the HfB 2 -SiC-La 2 O 3 coatings.