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Water takeoff performance calculation method for amphibious aircraft based on digital virtual flight

Chinese Journal of Aeronautics 2020年第12期33卷 3082-3091页

作者： Lixin WANG haipeng yin Kun YANG Hailiang LIU Jianghui ZHU School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China Chinese Flight Test Establishment Xi'an 710089China

Owing to the strong coupling among the hydrodynamic forces,aerodynamic forces and motion of amphibious aircraft during the water takeoff process,the water takeoff performance is difficult to calculate accurately and *** on an analysis of the dynamics and kinematics characteristics of amphibious aircraft and the hydrodynamic theory of high-speed planing hulls,a suitable mathematical model is established for calculating the hydrodynamics of aircraft during water takeoff.A pilot model is designed to illustrate how pilots are affected by the lack of visual reference and the necessity to simultaneously control the pitch angle,flight velocity and other parameters during water *** with the aerodynamic model,engine thrust model and aircraft motion model,a digital virtual flight simulation model is developed for amphibious aircraft during water takeoff,and a calculation method for the water takeoff performance of amphibious aircraft is proposed based on digital virtual *** performance indicators,such as the liftoff time and liftoff distance,can be obtained via digital virtual flight calculations.A comparison of the measured flight test data and the calculation results shows that the calculation error is less than 10%,which verifies the correctness and accuracy of the proposed *** method can be used for the preliminary evaluation of airworthiness compliance of amphibious aircraft design schemes,and the relevant calculation results can also provide a theoretical reference for the formulation of flight test plans for airworthiness certification.

关键词： Amphibious aircraft Digital virtual flight Hydrodynamic Pilot model Water takeoff performance

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Science China(Technological Sciences) 2019年第3期62卷 490-501页

作者： YUE Ting ZHANG Qi yin haipeng WANG LiXin ZHU JiangHui School of Aeronautic Science and Engineering Beihang University China Flight Test Establishment

The flight control law design for tanker should ensure that the closed-loop response can meet the aerial refueling mission requirements. In order to reveal the movement characteristics of the tanker and the handling characteristics of the pilot in aerial refueling, the flight path capture and hold under gust disturbance task is designed as the demonstration maneuver mission to evaluate the flying qualities for tanker in aerial refueling task, which is based on the design requirements of maneuvering tasks used in mission-oriented flying qualities assessment. By analyzing the flight path tracking and holding requirements of the tanker in aerial refueling mission, the relevant parameters that reflect the response characteristics of the tanker in pitch and roll axes are put forward. The ground flight simulation test based on mission-oriented flight quality assessment is conducted, and the test pilot's assessment results based on Cooper-Harper rating and PIO scales are obtained for different flight control law configurations. The suggested requirements of the closed-loop response characteristics of the pitch and roll axes of the tanker are put forward, which can be specifications for the aerial refueling mode flight control design of tanker.

关键词： aerial refueling tanker closed-loop response flight simulation test mission-oriented

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基于几何形态学影响的集料建模及评价方法

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西南交通大学学报 2022年第6期57卷 1184-1192页

作者：尹海鹏李有堂黄华兰州理工大学机电工程学院甘肃兰州730050

目前流行的数字集料建模技术效率和质量低,参数不可控且不能兼顾集料的形状、棱角、纹理等多个几何形态参数,导致难以有效在细观层面研究集料几何形态参数对颗粒复合材料综合性能的影响.针对上述问题,首先,研究了单一集料几何形态特征评... 详细信息

目前流行的数字集料建模技术效率和质量低,参数不可控且不能兼顾集料的形状、棱角、纹理等多个几何形态参数,导致难以有效在细观层面研究集料几何形态参数对颗粒复合材料综合性能的影响.针对上述问题,首先,研究了单一集料几何形态特征评价,并给出一种评价集料表面微观纹理和集料系统的数学方法;其次,基于3D Max提出一种新颖的单一集料数字模型设计技术,创建了带有不规则形状、无序棱角和精细表面纹理的集料数字模型;最后,基于PFC 3D并采用“颗粒替换法”创建颗粒复合材料数字模型,进而分析了实物模型和数字模型空隙率差异,并给出解决空隙率差异的数学方法.在此基础上,通过单轴压缩试验研究了集料几何学特性对颗粒复合材料峰值抗压强度的影响.研究结果表明:1)给出的集料纹理评价数学方法能量化集料微观结构,而集料系统评价数学模型拓展了集料几何形态学评价指标;2)颗粒复合材料实物模型和数字模型空隙率存在较大差异;3)集料的几何学特征能提高集料之间的咬合互锁效应,用不规则颗粒替换粒径≥2.36 mm的球形颗粒可使复合材料的峰值抗压强度提高20.7%.

关键词：集料建模几何形态复合材料空隙率

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Silencing of CD59 enhanced the sensitivity of HT29 cells to 5- Fluorouracil

Silencing of CD59 enhanced the sensitivity of HT29 cells to ...

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第八届全国免疫学学术大会

作者： Cuiling LI haipeng yin Shaoyu Wang Aihua Zhang Xia Ren Guosheng Jiang Key Laboratory for Tumor Immunology and Traditional Chinese Medicine Immunology Key Laboratory for Rare and Uncommon Diseases Institute of Basic Medicine Shandong Academy of Medical Sciences Image center The Third People's Hospital in Jinan City Shandong Provincial Institute of Dermatology and Venereology Shandong Academy of Medical Sciences

Membrane complement regulatory proteins(m CRPs)play important roles in tumor evasion by suppressing NK、T cell functions,promoting tumorigenesis and tumor invasion,however,whether they are related to chemotherapy resistance is *** address this question,SiRNAs targeting CD55 and CD59 were chemically synthesized and transfected into HT-29 cells by *** SiRNAs were identified by RT-PCR and flow *** of HT-29 to 5-FU and its proliferation activity were detected by MTT assay.

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机床基础件用颗粒增强树脂基自愈复合材料研究进展

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高分子材料科学与工程 2023年第8期39卷 156-164页

作者：尹海鹏李有堂李武强黄华兰州理工大学机电工程学院甘肃兰州730050

钢和铸铁的热稳定性和动态性能不足是影响机床精密加工的主要因素之一,同时矿物复合材料在服役过程中出现的非预期断裂、过度磨损和表面腐蚀等损伤也成为影响机床寿命和可靠性的主要问题。针对精密机床基础件对动态性能的要求和损伤的... 详细信息

钢和铸铁的热稳定性和动态性能不足是影响机床精密加工的主要因素之一,同时矿物复合材料在服役过程中出现的非预期断裂、过度磨损和表面腐蚀等损伤也成为影响机床寿命和可靠性的主要问题。针对精密机床基础件对动态性能的要求和损伤的早期感知与防治问题,提出开发应用于机床基础件的颗粒增强树脂基自愈复合材料。文中首先综述了机床常用材料的发展现状,其次介绍了机床用矿物复合材料和复合结构的最新研究成果,最后重点讨论了现有智能自愈材料的自愈机理、优劣势和局限性。基于研究成果综述,总结了当前颗粒增强树脂基自愈复合材料开发面临的挑战:(1)微观-细观-宏观层面的跨尺度分析、设计理论和模拟方法;(2)微胶囊在全生命周期中抗裂性、可裂性的定向设计和特殊工况下的止裂性问题;(3)损伤竞争耦合条件下构建材料内部微裂纹应力场和位移场数学模型。

关键词：精密机床动态性能损伤防治复合材料自愈

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招商银行深圳分行大厦主塔楼结构抗震性能化设计

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建筑结构 2016年第9期46卷 19-24页

作者：史杰施泓尹海鹏中国建筑设计院有限公司北京100044

招商银行深圳分行大厦主塔楼结构高度为160.2m,外框架存在两次斜柱转换,高位转换以下采用钢管混凝土柱、钢梁框架+钢筋混凝土核心筒,高位转换以上采用钢筋混凝土柱+钢筋混凝土梁+钢筋混凝土核心筒结构体系。采用SATWE,MIDAS/Building软... 详细信息

招商银行深圳分行大厦主塔楼结构高度为160.2m,外框架存在两次斜柱转换,高位转换以下采用钢管混凝土柱、钢梁框架+钢筋混凝土核心筒,高位转换以上采用钢筋混凝土柱+钢筋混凝土梁+钢筋混凝土核心筒结构体系。采用SATWE,MIDAS/Building软件对结构进行了整体计算和弹性时程分析,采用ABAQUS软件对结构进行了大震弹塑性分析;采用ANSYS软件对斜柱转换进行了节点分析,对底部跃层柱进行了屈曲分析。计算结果表明,结构各项指标均满足规范相关要求,最后通过概念设计对关键和重要构件作了适当加强,在构造措施方面亦作了相应处理,整体结构满足小震不坏,中震下主要构件不屈服、震后可以修复,大震不倒塌的抗震设防目标。

关键词：招商银行深圳分行大厦斜柱转换钢管混凝土柱跃层柱

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舵面破损对飞机轴间运动耦合飞行品质的影响

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航空学报 2021年第6期42卷 287-300页

作者：殷海鹏王立新乐挺刘海良张喆尤俊彬北京航空航天大学航空科学与工程学院北京100191 中国飞行试验研究院西安710089

为研究舵面破损对电传控制飞机轴间运动耦合飞行品质的影响,选取了能够反映飞机多轴运动耦合特性的飞行品质评定任务,建立了舵面破损飞机的飞行动力学模型,选取了适用于表征飞机轴间运动耦合程度的特征参数,形成了基于任务的角速率指令... 详细信息

为研究舵面破损对电传控制飞机轴间运动耦合飞行品质的影响,选取了能够反映飞机多轴运动耦合特性的飞行品质评定任务,建立了舵面破损飞机的飞行动力学模型,选取了适用于表征飞机轴间运动耦合程度的特征参数,形成了基于任务的角速率指令式电传控制飞机轴间运动耦合飞行品质的评定方法。采用该方法对具有不同舵面破损程度的算例飞机开展了飞行品质评估试验,得到了能够量化舵面破损对角速率指令式电传控制飞机飞行品质影响的特征参数取值规律。研究结果对于舵面破损情形下飞机飞行安全与作战效能评估等均有一定的理论参考价值。

关键词：舵面破损轴间运动耦合飞行品质基于任务作战效能

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Neural Regeneration Research 2025年第2期20卷 366-377页

作者： Samuel Abokyi Dennis Yan-yin Tse School of Optometry The Hong Kong Polytechnic UniversityKowloonHong Kong Special Administrative RegionChina Research Center for SHARP Vision The Hong Kong Polytechnic UniversityKowloonHong Kong Special Administrative RegionChina Center for Eye and Vision Research Sha TinHong Kong Special Administrative RegionChina

Retinal aging has been recognized as a significant risk factor for various retinal disorders,including diabetic retinopathy,age-related macular degeneration,and glaucoma,following a growing understanding of the molecular underpinnings of their *** comprehensive review explores the mechanisms of retinal aging and investigates potential neuroprotective approaches,focusing on the activation of transcription factor *** meta-analyses have demonstrated promising outcomes of transcription factor EB-targeted strategies,such as exercise,calorie restriction,rapamycin,and metformin,in patients and animal models of these common retinal *** review critically assesses the role of transcription factor EB in retinal biology during aging,its neuroprotective effects,and its therapeutic potential for retinal *** impact of transcription factor EB on retinal aging is cell-specific,influencing metabolic reprogramming and energy homeostasis in retinal neurons through the regulation of mitochondrial quality control and nutrient-sensing *** vascular endothelial cells,transcription factor EB controls important processes,including endothelial cell proliferation,endothelial tube formation,and nitric oxide levels,thereby influencing the inner blood-retinal barrier,angiogenesis,and retinal ***,transcription factor EB affects vascular smooth muscle cells,inhibiting vascular calcification and *** retinal pigment epithelial cells,transcription factor EB modulates functions such as autophagy,lysosomal dynamics,and clearance of the aging pigment lipofuscin,thereby promoting photoreceptor survival and regulating vascular endothelial growth factor A expression involved in *** cell-specific functions of transcription factor EB significantly impact retinal aging mechanisms encompassing proteostasis,neuronal synapse plasticity,energy metabolism,microvasculature,and inflammation,ultimately offering pro

关键词： age-related macular degeneration anti-aging interventions autophagy calorie restriction diabetic retinopathy exercise glaucoma neuromodulation phagocytosis photoreceptor outer segment degradation retinal aging transcription factor EB

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DKP-SLAM:A Visual SLAM for Dynamic Indoor Scenes Based on Object Detection and Region Probability

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Computers, Materials & Continua 2025年第1期82卷 1329-1347页

作者： Menglin yin Yong Qin Jiansheng Peng College of Automation Guangxi University of Science and TechnologyLiuzhou545000China Department of Artificial Intelligence and Manufacturing Hechi UniversityHechi546300China Key Laboratory of AI and Information Processing Education Department of Guangxi Zhuang Autonomous RegionHechi546300China Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology School of Chemistry and BioengineeringHechi UniversityHechi546300China

In dynamic scenarios,visual simultaneous localization and mapping(SLAM)algorithms often incorrectly incorporate dynamic points during camera pose computation,leading to reduced accuracy and *** paper presents a dynamic SLAM algorithm that leverages object detection and regional dynamic ***,a parallel thread employs the YOLOX object detectionmodel to gather 2D semantic information and compensate for missed ***,an improved K-means++clustering algorithm clusters bounding box regions,adaptively determining the threshold for extracting dynamic object contours as dynamic points *** process divides the image into low dynamic,suspicious dynamic,and high dynamic *** the tracking thread,the dynamic point removal module assigns dynamic probability weights to the feature points in these *** with geometric methods,it detects and removes the dynamic *** final evaluation on the public TUM RGB-D dataset shows that the proposed dynamic SLAM algorithm surpasses most existing SLAM algorithms,providing better pose estimation accuracy and robustness in dynamic environments.

关键词： Visual SLAM dynamic scene YOLOX K-means++clustering dynamic probability

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Research on Stock Price Prediction Method Based on the GAN-LSTM-Attention Model

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Computers, Materials & Continua 2025年第1期82卷 609-625页

作者： Peng Li Yanrui Wei Lili yin College of Computer Science and Technology Harbin University of Science and TechnologyHarbin150006China

Stock price prediction is a typical complex time series prediction problem characterized by dynamics,nonlinearity,and *** paper introduces a generative adversarial network model that incorporates an attention mechanism(GAN-LSTM-Attention)to improve the accuracy of stock price ***,the generator of this model combines the Long and Short-Term Memory Network(LSTM),the Attention Mechanism and,the Fully-Connected Layer,focusing on generating the predicted stock *** discriminator combines the Convolutional Neural Network(CNN)and the Fully-Connected Layer to discriminate between real stock prices and generated stock ***,to evaluate the practical application ability and generalization ability of the GAN-LSTM-Attention model,four representative stocks in the United States of America(USA)stock market,namely,Standard&Poor’s 500 Index stock,Apple Incorporatedstock,AdvancedMicroDevices Incorporatedstock,and Google Incorporated stock were selected for prediction experiments,and the prediction performance was comprehensively evaluated by using the three evaluation metrics,namely,mean absolute error(MAE),root mean square error(RMSE),and coefficient of determination(R2).Finally,the specific effects of the attention mechanism,convolutional layer,and fully-connected layer on the prediction performance of the model are systematically analyzed through ablation *** results of experiment show that the GAN-LSTM-Attention model exhibits excellent performance and robustness in stock price prediction.

关键词： Stock price prediction generative adversarial network attention mechanism time-series prediction

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