Abstract On the basis of the requirements of river-crossing emergency traffic guarantee, a structural modification was exerted on 40-foot Dry Cargo Container. A structure of refitted floating container was designed, which could be used in the assembly of emergency floating bridge. A finite element method (FEM) theoretical analysis was made on the static strength and stiffness of refitted floating container. Two kinds of load levels were brought in as the typical working conditions. Modelling in the ANSYS circumstance to simulation analysis and accomplishing optimization design based on the results. The results show that the floating bridge system assembled by refitted floating containers can’t support the load under the level of wheel type-20 and crawler type-500 for a stress concentration appears on the contact sites between floating container and main girder. The maximum stress goes beyond the limit of yield strength. An structural optimization was made to eliminate the influence of stress concentration and floating bridge system assembled by refitted floating containers can meet the requirements of load level of wheel type-20 and crawler type-500 after optimization. The refitted floating container can play a role in transporting troops and engineering emergency task crossing the river in a short period of time.
The near space airships usually have a large volume. when the airship leave the boathouse, it is influenced by the near surface wind significantly, and the attitude of the airship will change, and the risk of the experiment will be increase. In this paper, the dynamics method is used to analyse the force in the mooring rope and the attitude of the airship with nosecone constraint. The kinetic equation is established. A typical near space airship is choose as an example. The Runge- Kutta method is used to solve the dynamic equation. According to calculation result, the change law of the force in the mooring rope and the attitude of the airship is given, which can provide reference for the near space airship experiment. For the airport in this paper, the force in the mooring rope near the tail in the windward side is bigger than the others. The stronger rope should be used in design.
Abstract The similarity measurement of high-dimensional data is an important research content in data mining and other fields. Aiming at the shortcomings of the traditional similarity measurement algorithms, a new measurement algorithm is proposed. The results of comparison with traditional algorithms show that new algorithm can quantitatively and intuitively reflect the similarity of two sets of high-dimensional data, and has strong adaptability and superiority.
Airship monitoring is a technology that uses airships to carry photoelectric equipment to continuously observe targets. Limited by equipment performance and aircraft altitude, the monitoring system has a limited observation area and cannot cover all target points in the area. In order to efficiently display the benefits of equipment and cover as many targets as possible, it is necessary to reasonably plan the location of the monitoring system. By modeling the problem of the maximum coverage of airship monitoring, the article uses the search algorithm based on mesh division, the search algorithm to determine the center of the circle, the search algorithm to determine the arc, and the most value solution algorithm of the function. Through simulation analysis, the results of the above algorithm are carried out to compare.
In reverse engineering such as surface reconstruction, to solve the registration of point clouds of laser radar problem, a method based on moving least-squares was conducted to make feature extraction of target ball and then established linear equations to calculate the coordinate of the ball's center based on characteristic curves. Lastly, registration of point clouds was conducted based on four coordinates of the balls' centers. Experimental result shows that the method can improve the computing precision of the coordinate of the ball's center and the error of registration is in degree of millimeter based on moving least-squares. The accuracy is high and satisfies the engineering demand.
Laccases (LACs) are vital plant growth and development enzymes, participating in lignin biopolymerization and responding to stress. However, the role of LAC genes in plant development as well as stress tolerance, is still not well understood, particularly in sesame (Sesamum indicum L.), an important oilseed crop. In this study, 51 sesame LAC genes (SiLACs) were identified, which were unevenly distributed across different chromosomes. The phylogeny of Arabidopsis LAC (AtLACs) subdivided the SiLAC proteins into seven subgroups (Groups I-VII), of which Group VII contained only sesame LACs. Within the same subgroup, SiLACs exhibit comparable structures and conserved motifs. The promoter region of SiLACs harbors various cis-acting elements that are related to plant growth, phytohormones, and stress responses. Most SiLACs were expressed in the roots and stems, whereas some were expressed specifically in flowers or seeds. RNA-seq analysis revealed that 19 SiLACs exhibited down-regulation and three showed up-regulation in response to drought stress, while 15 SiLACs were down-regulated and four up-regulated under salt stress. Additionally, qRT-PCR analysis showcased that certain SiLAC expression was significantly upregulated as a result of osmotic and salt stress. SiLAC5 and SiLAC17 exhibited the most significant changes in expression under osmotic and salt stresses, indicating that they may serve as potential targets for improving sesame resistance to various stresses. Our study offers a thorough comprehension of LAC gene structure, classification, evolution, and abiotic stress response in sesame plants. Furthermore, we provide indispensable genetic resources for sesame functional characterization to enhance its tolerance to various abiotic stresses.
An improper switching operation can damage equipment and/or can affect the quality of supply to the customers. Normally, switches are opened and closed by operators using pre-generated guidelines for avoiding human errors. But all of that are changed after IEC61850 which require the interlocking should be based on network. However, IEC61850 didn't give the implementation of CILO where interlocking happens, so, a Multi-agent based logical interlocking method is proposed. Method of getting switch gear status, logical structure of substation, ways of expressing knowledge in substation is analyzed. Agents are assigned roles for different function. Task-allocated, communication mechanism, inside of agent will also be researched in this paper. Finally, on the case study of some simulations, this method can fulfill the function and realtime requirements in the substation automation systems.
According to the actual use of large mobile truss platform, a structural health diagnosis system is designed in order to realize long-term health monitoring and safety evaluation of the platform. The system completes data acquisition and transmission based on sensing and communication technology. By optimizing the arrangement of strain sensors, displacement sensors and vibration sensors, various data information reflecting the structural conditions and main components are obtained, so as to realize the monitoring of structural response and behavior during the use of the platform. The system uses the collected data to analyze the safety status of the platform. On the one hand, it assists the operator to complete the safety state inspection of the platform, and on the other hand, it can assist the operator to discover the potential hidden dangers of the platform in time.
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