Search

This paper establishes a scientific training model for sports tourism based on the nonlinear differential equation. This paper takes sports tourism as the research object. Then the nonlinear differential equation method is used to model communication, access, risk assessment and transparency. Then this paper analyzes and discusses how to improve residents' participation in sports tourism sports projects. Finally, this paper finds that the method has a good application prospect in the analysis and modeling sports tourism basketball projects by experimental simulation.

In order to scientifically prevent and control the accident of coal mine gas, it is necessary to clarify the causes of coal mine gas accidents so as to take corresponding control measures. Based on the text mining method and R language, 126 domestic investigation reports of coal mine gas accidents from 2012 to 2020 were collected for word processing, feature dimension reduction and word cloud visualization, then the network structure diagram was constructed, and the social network centrality analysis and core edge structure analysis were carried out. The results show that there are 4 key causes and 27 general causes among the 31 causes obtained from text mining. According to the network density of each cause, the core area and edge area in the network are divided.

Steel fiber is the most widely used type of fiber in concrete because of its advanced and economical manufacturing facilities, reinforcing effect, and ability to cope with changing environmental conditions. The use of steel fiber in concrete can reduce the amount of reinforcement used and increase the crack resistance of concrete, which extends the service life of concrete structures, reduces the frequency of maintenance and repairs, and consequently lowers energy consumption and emissions. Many studies focus on the postcracking behavior of steel fiber–reinforced concrete (SFRC). However, it is also crucial to examine the precracking behavior of SFRC at early age. A temperature stress test machine (TSTM) was used to investigate the autogenous shrinkage (AS), tensile creep (TC), and cracking behavior of hooked-end SFRC (HSFRC) at early age under uniaxial constant restrained condition. Analysis and experimental findings demonstrated that (1) the addition of steel fiber increased the splitting tensile strength and modulus of elasticity of HSFRC. The 1-, 3-, and 7-day splitting tensile strength and modulus of elasticity increased with an increase in curing temperature. However, a decrease was observed at 28 days as the curing temperature increased; (2) increasing steel fiber content had a significant influence on reducing TC and AS of HSFRC. TC and AS of HSFRC increased with increasing curing temperature; and (3) early-age cracking potential of HSFRC decreased as steel fiber content increased. Increased curing temperature resulted in a concomitant elevation in the potential for early-age cracking in HSFRC. [ABSTRACT FROM AUTHOR]

Transient interference often submerges the actual targets when employing over-the-horizon radar (OTHR) to detect targets. In addition, modern OTHR needs to carry out multi-target detection from sea to air, resulting in the sparse sampling of echo data. The sparse OTHR signal will raise serious grating lobes using conventional methods and thus degrade target detection performance. This article proposes a modified Alternating Direction Method of Multipliers (ADMM)-Net to reconstruct the target and clutter spectrum of sparse OTHR signals so that target detection can be performed normally. Firstly, transient interferences are identified based on the sparse basis representation and then excised. Therefore, the processed signal can be seen as a sparse OTHR signal. By solving the Doppler sparsity-constrained optimization with the trained network, the complete Doppler spectrum is reconstructed effectively for target detection. Compared with traditional sparse solution methods, the presented approach can balance the efficiency and accuracy of OTHR signal spectrum reconstruction. Both simulation and real-measured OTHR data proved the proposed approach's performance. [ABSTRACT FROM AUTHOR]

Study Design: systematic review of cross-cultural adaptation. Objectives: SOSGOQ 2.0 was widely used to assess the HRQQOL of patients with spinal metastasis. Due to the lack of methodological quality assessment, it is a challenge to use the questionnaire in routine practice. This study aims to comprehensively evaluate the translation procedures and measurement attributes of SOSGOQ 2.0 according to COSMIN guidelines. Methods: The literature was reviewed adhering to the PRISMA guidelines. Each translation process and different cultural adaptation methods were classified according to the guidelines for Cross cultural Adaptation Process of Self Reporting Measures, and the methodological quality of the identified research was evaluated according to the consensus based on the selection criteria of health measurement tools. Results: 6 publications finally met the inclusion criteria. As for the evaluation of translation procedures and cross-cultural adaptability, two adaptations did not report the detailed information in translation and cross-cultural adaptation (synthesis, back translation, review by expert committee, pre-test), factor analysis and sample size calculation were only mentioned in two studies, and only one adaptation met the minimum sample size standard. Regard to the methodological quality assessment of measurement attributes, all adaptations completed internal consistency, structural effectiveness and reliability. However, none of the adaptations reported measurement errors and only one reported response sensitivity. Conclusions: We found that the methodological quality of the current adaptation was uneven, and the report of measurement attribute results was not comprehensive. We recommend higher quality German, Italian and Chinese adaptation. [ABSTRACT FROM AUTHOR]