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巴黎奥运会视野下基于三段法对莫雷高德的技战术分析

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体育科技文献通报 2024年第2期32卷 23-24,250页

作者：史新宇邵颖北京体育大学北京100084 晋中信息学院体育教学部山西太谷030800

莫雷高德是瑞典队新生代主力球员,其在今年比赛中的表现可圈可点,且拥有较强的发展势头,未来十年,莫雷高德必将成为中国乒乓球队的主要竞争对手之一,因此对其展开技战术分析十分必要。本文以莫雷高德在2021年至2023年期间的六场比赛中... 详细信息

莫雷高德是瑞典队新生代主力球员,其在今年比赛中的表现可圈可点,且拥有较强的发展势头,未来十年,莫雷高德必将成为中国乒乓球队的主要竞争对手之一,因此对其展开技战术分析十分必要。本文以莫雷高德在2021年至2023年期间的六场比赛中所表现出的技战术特征为研究对象,采用录像观察、乒乓球三段统计等研究方法对其进行研究。结果表明:①这位选手的技战术特征比较突出,变化多样;②发球落点以正手短球和反手短球为主,辅之以反手长球,发球后正手和侧身抢攻能力突出;③接发球以控制为主,台内抢攻能力稍显不足,第四板反手稳定性优于正手;①相持中,攻强守弱,反手相持能力优于正手。

关键词：乒乓球莫雷高德技战术三段统计法

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双肺多发结节伴空洞形成

中华结核和呼吸杂志 2024年第3期47卷 214-221页

作者：石欣雨徐莉莉高燕莉方秋红冯瑞娥安立首都医科大学附属北京朝阳医院、北京市呼吸疾病研究所呼吸与危重症医学科北京100020 首都医科大学附属北京朝阳医院放射科北京100020 中国医学科学院北京协和医院病理科北京100730

患者女,64岁,2023年2月21日因“右侧胸痛4年余,左侧胸痛9个月余”就诊于北京朝阳医院。既往有陈旧性肺结核、类风湿关节炎病史。2018年10月胸部CT示双肺多发结节。CT引导下穿刺病理未见肿瘤。胸腔积液腺苷脱氨酶升高,考虑结核可能性大,... 详细信息

患者女,64岁,2023年2月21日因“右侧胸痛4年余,左侧胸痛9个月余”就诊于北京朝阳医院。既往有陈旧性肺结核、类风湿关节炎病史。2018年10月胸部CT示双肺多发结节。CT引导下穿刺病理未见肿瘤。胸腔积液腺苷脱氨酶升高,考虑结核可能性大,于2019年3月起给予抗结核治疗。2019年12月因右侧局限性液气胸,行右肺下叶切除,术后病理示肉芽肿性炎伴坏死。2020年5月胸部CT示肺部结节及空洞较前明显增多。2023年1月考虑不除外隐球菌肺炎,给予氟康唑口服。最终,术后病理会诊确诊为肺类风湿结节,给予口服泼尼松及吗替麦考酚酯治疗1个月后复查胸部CT较前好转,建议继续目前治疗,定期复查胸部CT。

关键词：肉芽肿结节病,肺临床讨论会类风湿小结

基于TSP_RRT算法的柑橘多目标连续采摘路径规划

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江西农业大学学报 2024年第2期46卷 490-501页

作者：马萧杰施新宇肖文星任梦涛鲍秀兰华中农业大学工学院湖北武汉430070 农业农村部长江中下游农业装备重点实验室湖北武汉430070 湖南大学电气与信息工程学院湖南长沙410000

【目的】柑橘等季节性水果收获约占整个作业量的40%,耗时耗力,研发柑橘采摘机器人已成为提高柑橘生产效率的重要途径。为解决柑橘采摘机械臂在果园非结构化环境下的规划效率低、规划路径长等问题,提出了一种非结构环境下将旅行商问题(T... 详细信息

【目的】柑橘等季节性水果收获约占整个作业量的40%,耗时耗力,研发柑橘采摘机器人已成为提高柑橘生产效率的重要途径。为解决柑橘采摘机械臂在果园非结构化环境下的规划效率低、规划路径长等问题,提出了一种非结构环境下将旅行商问题(TSP)和快速搜索随机树算法(RRT)相结合的柑橘连续采摘最优路径规划方法(TSP_RRT)。【方法】为了在仿真环境中描述真实的柑橘果树,建立了基于几何包络法的柑橘树模型。将柑橘树的树枝树干等障碍物部分采用分段圆柱体包络,无需采摘的柑橘采用包围球包络。采用带先决条件的概率性随机采样策略,通过引入采样阈值与生成的采样随机数进行判断,可以有效降低采样的盲目性。引入目标引力控制节点生长的最短距离,实现扩展树的生长方向总是朝着目标点的方向,引入自适应步长使得扩展树在生长时根据障碍物的密度自动调节步长大小,目标引力和自适应步长策略提高了采摘机器人路径规划的收敛速度和规划效率。为提高柑橘多目标采摘路径的整体最优规划,缩短路径长度。基于遗传算法的旅行商问题,并考虑采摘过程中树枝等障碍物的干扰,引入障碍物因子来获取多目标采摘顺序的最优解。【结果】仿真结果表明,TSP_RRT算法规划所获得的连续采摘路径长度相比于TSP_RRT-connect算法和TSP_RRT*算法的多目标连续采摘路径分别缩短34.52%、10.19%,规划时间分别减少约31%、50%,TSP_RRT算法的路径规划成功率约为98.8%。【结论】与多种机械臂路径规划的RRT算法相比,改进后的TSP_RRT算法可以快速、准确地生成一条机械臂采摘的最优路径,缩短了路径规划的长度,减少了路径规划的时间。该算法可为柑橘采摘机器人在多目标连续采摘中提供参考和技术支持。

关键词：果园柑橘采摘机器人多目标连续采摘路径规划机械臂避障

Low-energy spin dynamics in a Kitaev material Na_(3)Ni_(2)BiO_(6) investigated by nuclear magnetic resonance

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Chinese Physics B 2024年第6期33卷 518-524页

作者：史昕雨崔祎上官艳艳徐霄宇吴占龙胡泽李硕杜柯帆陈颖马龙刘正鑫温锦生张金珊于伟强 Mathematics and Physics Department North China Electric Power UniversityBeijing 102206China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing 210093China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of SciencesHefei 230031China Innovative Center for Advanced Microstructures Nanjing UniversityNanjing 210093China

We perform ^(23)Na nuclear magnetic resonance(NMR) and magnetization measurements on an S=1,quasi-2D honeycomb lattice antiferromagnet Na_(3)Ni_(2)BiO_(6).A large positive Curie-Weiss constant of 22.9 K is *** NMR spectra at low fields are consistent with a zigzag magnetic order,indicating a large easy-axis *** the field applied along the c*axis,the NMR spectra confirm the existence of a 1/3-magnetization plateau phase between 5.1 T and 7.1 *** transition from the zigzag order to the 1/3-magnetization plateau phase is also found to be a first-order type.A monotonic decrease of the spin gap is revealed in the 1/3-magnetization plateau phase,which reaches zero at a quantum critical field H_(C)≈8.35 T before entering the fully polarized *** data suggest the existence of exchange frustration in the system along with strong ferromagnetic interactions,hosting the possibility for Kitaev ***,well below the ordered phase,the 1/T_(1) at high fields shows either a level off or an enhancement upon cooling below 3 K,which suggests the existence of low-energy fluctuations.

关键词： one–third magnetization plateau phase nuclear magnetic resonance honeycomb-lattice antiferromagnet Kitaev interaction

基于“媒体融合+体育健康促进”的健康城市建设体系构建研究

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武术研究 2024年第2期9卷 130-133页

作者：史新宇杨永立江苏省梅村高级中学江苏无锡214028 江苏联合职业技术学院无锡机电分院江苏无锡214028

健康城市建设是“健康中国”建设的重要环节,也是中国梦实现的基础保障。以“媒体融合”“体育健康促进”为视角,文章运用文献资料法和逻辑分析法探讨健康城市建设,研究认为:“媒体融合+体育健康促进”的健康城市体系,由“目标体系”“... 详细信息

健康城市建设是“健康中国”建设的重要环节,也是中国梦实现的基础保障。以“媒体融合”“体育健康促进”为视角,文章运用文献资料法和逻辑分析法探讨健康城市建设,研究认为:“媒体融合+体育健康促进”的健康城市体系,由“目标体系”“行动体系”“保障体系”三大维度构成,每个维度包含三个要素,三个维度相互协调、共同促进,九个要素相互融合、彼此影响,旨在培养有益的体育意识,养成科学的体育生活方式,营造活跃的体育环境。

关键词：媒体融合体育健康促进健康城市建设

Research on coupled thermo-hydro-mechanical dynamic response characteristics of saturated porous deep-sea sediments under vibration of mining vehicle

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Applied Mathematics and Mechanics(English Edition) 2021年第9期42卷 1349-1362页

作者： Wei ZHU xinyu shi Rong HUANG Liyue HUANG Wenbo MA Post-doctoral Research Station of Statistics School of Mathematics and Computational ScienceXiangtan UniversityXiangtan 411105Hunan ProvinceChina School of Mathematics and Computational Science Xiangtan UniversityXiangtan 411105Hunan ProvinceChina School of Mathematic and Computational Science Hunan University of Science and TechnologyXiangtan 411201Hunan ProvinceChina College of Civil Engineering and Mechanics Xiangtan UniversityXiangtan 411105Hunan ProvinceChina

The excessive deformation of deep-sea sediments caused by the vibration of the mining machine will adversely affect the efficiency and safety of *** with the deep-sea environment,the coupled thermo-hydro-mechanical problem for saturated porous deep-sea sediments subject to the vibration of the mining vehicle is *** on the Green-Lindsay(G-L)generalized thermoelastic theory and Darcy’s law,the model of thermo-hydro-mechanical dynamic responses for saturated porous deep-sea sediments under the vibration of the mining vehicle is *** obtain the analytical solutions of non-dimensional vertical displacement,excess pore water pressure,vertical stress,temperature,and change in the volume fraction field with the normal mode analysis method,and depict them *** normal mode analysis method uses the canonical coordinate transformation to solve the equation,which can quickly decouple the equation by ignoring the modal coupling effect on the basis of the canonical *** results indicate that the vibration frequency has obvious influence on the vertical displacement,excess pore water pressure,vertical stress,and change in volume fraction *** loading amplitude has a great effect on the physical quantities in the foundation,and the changes of the physical quantities increase with the increase in loading amplitude.

关键词： deep-sea sediment thermo-hydro-mechanical dynamic generalized thermoelastic theory normal mode analysis dynamic response characteristic

Detection and location algorithm against local-worm

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Science in China(Series F) 2008年第12期51卷 1935-1946页

作者： YANG xinyu shi Yi ZHU Huidun Department of Computer Science and Technology Xi'an Jiaotong University Xi'an 710049 China

The spread of the worm causes great harm to the computer network. It has recently become the focus of the network security research. This paper presents a local-worm detection algorithm by analyzing the characteristics of traffic generated by the TCP-based worm. Moreover, we adjust the worm location algorithm, aiming at the differences between the high-speed and the low-speed worm scanning methods. This adjustment can make the location algorithm detect and locate the worm based on different scanning rate. Finally, we verified the validity and efficiency of the proposed algorithm by simulating it under NS-2.

关键词： worm detection traffic characteristic detection and location

A Dual-Platform Laser Scanner for 3D Reconstruction of Dental Pieces

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Engineering 2018年第6期4卷 796-805页

作者： Shuming Yang xinyu shi Guofeng Zhang Changshuo Lv State Key Laboratory for Manufacturing System Engineering Xi’an Jiaotong UniversityXi’an 710049China

This paper presents a dual-platform scanner for dental reconstruction based on a three-dimensional(3D)laser-scanning *** scanner combines translation and rotation platforms to perform a holistic scanning.A hybrid calibration method for laser scanning is proposed to improve convenience and *** method includes an integrative method for data collection and a hybrid algorithm for data *** integrative method conveniently collects a substantial number of calibrating points with a stepped gauge and a pattern for both the translation and rotation *** hybrid algorithm,which consists of a basic model and a compensation network,achieves strong stability with a small degree of *** experiments verified the hybrid calibration method and the scanner application for the measurement of dental *** typical dental pieces were measured,and the experimental results demonstrated the validity of the measurement that was performed using the dual-platform *** method is effective for the 3D reconstruction of dental pieces,as well as that of objects with irregular shapes in engineering fields.

关键词： Laser scanning Hybrid calibration Neural network Dental pieces

Dynamic coupled thermo-hydro-mechanical problem for heterogeneous deep-sea sediments under vibration of mining vehicle

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Applied Mathematics and Mechanics(English Edition) 2023年第4期44卷 603-622页

作者： Wei ZHU Xingkai MA xinyu shi Wenbo MA Hunan Key Laboratory for Computation and Simulation in Science and Engineering Xiangtan UniversityXiangtan 411105Hunan ProvinceChina School of Mathematics and Computational Science Xiangtan UniversityXiangtan 411105Hunan ProvinceChina School of Mechanical Engineering and Mechanics Xiangtan UniversityXiangtan 411105Hunan ProvinceChina

Due to the influence of deep-sea environment,deep-sea sediments are usually heterogeneous,and their moduli of elasticity and density change as depth *** with the characteristics of deep-sea sediments,the thermo-hydro-mechanical coupling dynamic response model of heterogeneous saturated porous sediments can be established to study the influence of elastic modulus,density,frequency,and load amplitude changes on the *** on the Green-Lindsay generalized thermoelasticity theory and Darcy’s law,the thermo-hydro-mechanical coupled dynamic response model and governing equations of heterogeneous deep-sea sediments with nonlinear elastic modulus and density are *** analytical solutions of dimensionless vertical displacement,vertical stress,excess pore water pressure,and temperature are obtained by means of normal modal analysis,which are depicted *** results show that the changes of elastic modulus and density have few effects on vertical displacement,vertical stress,and temperature,but have great effects on excess pore water *** the mining machine vibrates,the heterogeneity of deep-sea sediments has great influence on vertical displacement,vertical stress,and excess pore water pressure,but has few effects on *** addition,the vertical displacement,vertical stress,and excess pore water pressure of heterogeneous deep-sea sediments change more *** variation trends of physical quantities for heterogeneous and homogeneous deep-sea sediments with frequency and load amplitude are basically the *** results can provide theoretical guidance for deep-sea mining engineering construction.

关键词： heterogeneous deep-sea sediment coupled thermo-hydro-mechanical Green-Lindsay generalized thermoelastic theory normal modal anlalysis dynamic re-sponse