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通过13个Q460C、Q550D和Q690D钢中长柱的双向偏压试验，研究了高强钢焊接薄壁箱形截面双向压弯构件的局部-整体相关屈曲性能和极限承载力；将极限承载力与美国、欧洲规范以及新提出的计算公式的计算结果相比较，以验证它们对高强钢焊接薄壁箱形截面双向压弯构件局部-整体相关屈曲计算的适用性。结果表明，在钢材名义屈服强度fy=460~690 MPa，板件宽厚比b/t=40~70，构件长细比λ=45~79，偏心距ex=ey=20~45 mm范围内，美国规范ANSI/AISC 360-16对较大长细比（λ=79）和Q690D钢较小宽厚比（b/t=40）试件的计算结果偏于保守；欧洲规范BS EN 1993-1-1对较小板件宽厚比（b/t=40）试件的计算结果偏于保守，对其余试件是安全的；使用新提出的有效屈服强度法所得到的计算结果和试验结果吻合良好；新提出的有效截面法对大部分试件的计算结果偏于保守。

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When the tractor is undertaking the forestry carrying operation, due to the complex road conditions in the forest, it mostly runs at a low speed, has a high steering demand, and often has a load unit, so it pays more attention to its driving stability and steering sensitivity. In this paper, CarSim software is used to build the physical model and load unit model of the tractor, the control strategy of the tractor is designed based on Simulink software combined with the two-degree-of-freedom dynamic model, and the two-degree-of-freedom model of tractor is established. The braking torque feedback control is carried out by combining the yaw rate and the side deflection angle of centroid with the fuzzy control theory. In addition, the proportional control strategy of front and rear wheel angle is introduced according to the four-wheel steering mode of the tractor. Under the CarSim-Simlulink co-simulation platform, combined with the complex road conditions of forestry operations, the low-speed driving and steering experiments of tractor under different control strategies are carried out. The results show that the control strategy adopted in this paper can effectively reduce the steering radius of the tractor under complex road conditions, increase the steering speed, and limit the side deflection angle of centroid to a small range. The tractor has high stability, the steady state value of yaw rate is closer to the ideal state, and the steering is more sensitive. [ABSTRACT FROM AUTHOR]

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Lymphangioleiomyomatosis (LAM) is a rare progressive lung disease characterized by diffuse cystic lesions that primarily affects women of reproductive ages and leads to respiratory failure at the end stage of the disease, and significantly impacts patients' quality of life. The clinical use of mammalian target of rapamycin (mTOR) inhibitors (e.g. sirolimus) has moderated the rate of disease progression and significantly improved the survival in LAM patients. During the clinical diagnosis, treatment, and follow-up of LAM disease, the clinical characteristics and the course of the disease of different LAM patients are heterogeneous which might suggest differences in disease progression and long-term prognosis. The present review summarizes the progress of research on risk factors for LAM progression and mortality in order to optimize individualized intervention protocols in clinical practice and to improve long-term prognosis of patients. [ABSTRACT FROM AUTHOR]

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To reasonably solve the durability assessment problem of in-service concrete beam bridges, a game theory-based fusion assessment model was proposed. First, considering the regional environment and the characteristics of the bridge itself, an index evaluation system was constructed. Then, based on the full consideration of the impact between indicators, the subjective weights were calculated according to the DEMATEL-ANP method, and the causal relationships between indicators were intuitively shown using the DEMATEL method. Next, the equilibrium theory of game theory was utilized to integrate the subjective weights and CRITIC objective weights, and combined with the uncertainty measure theory, the bridge grade was determined. Finally, the model was verified with multiple in-service concrete bridges. It is demonstrated by the findings that the durability of the bridges aligns with their actual conditions, yielding a high level of accuracy. Additionally, when compared to traditional evaluation models, this model is not only more accurate, but it also takes into consideration the influences among indicators and uses the causal relationships between indicators to offer a basis for the subsequent repair sequence, thereby better adhering to actual engineering requirements. [ABSTRACT FROM AUTHOR]

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The development of artificial intelligence has received much attention recently and has been widely applied in the field of medicine. Development of clinical teaching technology based on artificial intelligence is important in improving the medical education. This article explores the current status and future prospects of the application of artificial intelligence in the training of respiratory medicine. [ABSTRACT FROM AUTHOR]

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