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179摩天轮高179m,轮缘直径170m,建成后将成为世界最高的摩天轮。179摩天轮采用刚性轮辐(刚性桁架硬支臂)与钢索混合结构形式。大型摩天轮的安装方案与摩天轮的结构设计密切相关,因此,在结构设计阶段就必须制订合理的安装方案。179摩天轮采用立面旋转安装法安装,并对8个施工步独立静止状态进行有限元分析。借助有限元软件ANSYS来模拟分析计算硬支臂和轮缘安装后不同安装位置静止情况下的等效应力、挠度、结构屈曲,由计算结果可知,不同安装位置摩天轮的结构安全可靠。

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In response to the difficulty in determining the number of modes and penalty parameters in traditional variational mode decomposition (VMD) methods, an improved variational mode decomposition method with adaptive parameter selection was proposed. Firstly, the impact and periodicity characteristics of faults were comprehensively considered, and a weighted spectral peak ratio ( WSPR) index was constructed based on the Gini index and spectral peak ratio index. Secondly, in order to obtain the optimal combination of mode number and penalty parameter, the African vulture optimization algorithm (AVOA) was used to iteratively optimize the mode number and penalty parameter of the variational mode decomposition method, which overcame the drawbacks of subjective parameter selection. The constructed weighted spectral peak to peak ratio index could not only serve as the objective function for optimizing the parameters of the African vulture optimization algorithm, but also adaptively select intrinsic modal functions after signal decomposition using variational modal methods. Finally, the selected optimal intrinsic modal functions were subjected to envelope demodulation analysis to extract early fault characteristics of rolling bearing faults. The method was validated using simulated signals, single-fault rolling bearing test signals, and composite-fault rolling bearing test signals. The experimental results show that the method can accurately extract the fault frequency (100 Hz) of the simulated signal, the fault frequency (236. 4 Hz) of the single fault signal, and the fault frequency (inner ring fault frequency 149. 14 Hz, outer ring fault frequency 86. 39 Hz) of the composite fault signal. In comparison with other methods and indicators, the spectral peaks of the fault characteristic frequency and its multiple frequencies in the optimal IMF envelope spectrum are more prominent and obvious, with higher accuracy and stronger robustness. The research results show that the method can effectively extract the weak features of the early fault signal of the bearing and achieve accurate identification of the fault type. [ABSTRACT FROM AUTHOR]

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Guocheng Gold Deposit is located on the northeast margin of Jiaolai Basin. It is composed of Tudui ore section, Shawang ore section, Dongliujia ore section, Longkou ore section, and Houkuang ore section. It is controlled by the detachment structural system dominated by Guocheng fault. The petrography and microscopic temperature measurement of quartz fluid inclusions in the ore show that the fluid inclusions in the deposit can be divided into 3 types: gas-liquid two-phase inclusions, CO2-containing three-phase inclusions, and pure liquid phase inclusions. The salinity of ore-forming fluid is 1.39% -16.53%, and the density is 0.56-1.00 g/cm³. It belongs to medium-low salinity and low- density fluid. The ore-forming temperature is 200°C-360°C, and the pressure of ore-forming fluid is 60-125 MPa. The ore-forming depth is 6.22-9.31 km. Based on predecessors' research achievements, it is considered that the genesis of Guocheng Gold Deposit is a mesothermal hydrothermal vein type deposit, of which the mineralization involves mantle fluid, controlled by the detachment structural system dominated by Guocheng fault. [ABSTRACT FROM AUTHOR]

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Copyright of Multipurpose Utilization of Mineral Resources / Kuangchan Zonghe Liyong is the property of Multipurpose Utilization of Mineral Resources Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Electric Machines & Control / Dianji Yu Kongzhi Xuebao is the property of Electric Machines & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Mangrove is a typical intertidal plant growing on tropical and subtropical coastlines, which has significant ecological and economic value. Strengthening mangrove monitoring is an important work for effective protection of mangrove. Mangrove demonstration area in the East coast of Leizhou, Guangdong Province was selected as the study area. The inversion model of mangrove structural parameters was established by using high-density point cloud data of unmanned aerial vehicle light detection and ranging (UAV-LiDAR) and measured quadrat data in the sample area. Results show that the accuracy of single tree height inversion is the best in the case of Sonneratia apetala, followed by Kandelia candel, and the lowest in the case of Avicennia marina. The overall inversion accuracy of the crown width parameters of individual mangrove tree is poor, and the highest recognition accuracy is the Sonneratia apetala. The UAV-LiDAR technology can effectively extract mangrove structural parameters, replace the traditional mangrove manual measurement method, and provide high-precision basic data for the dynamic change monitoring and protection of mangrove resources. [ABSTRACT FROM AUTHOR]

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Aiming at some "pain points" in data access of the wargame system, a bus-based real-time data collection and management platform for wargame is designed by absorbing the experience and lessons of domestic and foreign wargame systems. The distributed storage platform is introduced as the underlying storage foundation, and the in-memory database is introduced as the external service interface. The bus-based data collection is used as the collection source, and data cleaning and branch management based on data segments are performed. The system as a whole is divided into three modules, namely collection module, management module, and service module. It realizes real-time collection, cleaning, storage and management of wargame data. The practical application shows that the platform provides high-speed and reliable data access support for other modules in the wargame system. [ABSTRACT FROM AUTHOR]

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Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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The max independent set problem is a well-known NP problem and has applications in many scenarios. Traditional exact algorithms need exponential time complexity to solve the max independent set problem. In order to solve the max independent set problem more efficiently, proposes a quantum circuit solution based on the quantum approximate optimization algorithm. In this scheme, derives the Hamiltonian expression of the max independent set problem from the mathematical model of the max independent set, designes the quantum circuit based on the quantum approximation optimization algorithm. Using the COBYLA classical optimization algorithm to optimize the parameters in the parameter quantum gate, and using the quantum development framework Qiskit provided by IBM to conduct simulation experiments. Simulation results show that the solution of the max independent set problem can be obtained in polynomial time with high probability using the quantum approximate optimization algorithm, achieving an exponential speedup. Quantum approximate optimization algorithm is feasible and effective for solving the max independent set problem. [ABSTRACT FROM AUTHOR]

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Starlink is the only giant constellation in low Earth orbit currently being rapidly deployed. This paper analyzes the advantages and characteristics of low orbit satellite communication and summarizes Starlink construction and system architecture. The Satellite Toolkit (STK) is used to model and simulate 1 584 satellites of the first stage " Group 1". Then, according to the networking mode of Starlink satellite equipped with laser communication payload, Dijkstra algorithm is used to solve the shortest inter-satellite communication link distance between any two Starlink satellites. Thus, the theoretical shortest communication delay is calculated. The average communication delay from Hawaii Camp Smith to the Yokota. Air Base is 42. 700 7492 ms. Based on the simulation results, the military application of Starlink in communication is predicted. [ABSTRACT FROM AUTHOR]

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