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Longitudinal vibration characteristics of a tapered pipe pile considering the vertical support of surrounding soil and construction disturbance

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Earthquake Engineering and Engineering Vibration 2024年第1期23卷 51-63页

作者： Li Zhenya pan Yunchao He Xianbin Lv chong Mohammad Towhid Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China Geotechnical Research Institute Hohai UniversityNanjing 210098China MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang UniversityHangzhou 310058China

This research is concentrated on the longitudinal vibration of a tapered pipe pile considering the vertical support of the surrounding soil and construction disturbance.First,the pile-soil system is partitioned into finite segments in the vertical direction and the Voigt model is applied to simulate the vertical support of the surrounding soil acting on the pile segment.The surrounding soil is divided into finite ring-shaped zones in the radial direction to consider the construction disturbance.Then,the shear complex stiffness at the pile-soil interface is derived by solving the dynamic equilibrium equation for the soil from the outermost to innermost zone.The displacement impedance at the top of an arbitrary pile segment is obtained by solving the dynamic equilibrium equation for the pile and is combined with the vertical support of the surrounding soil to derive the displacement impedance at the bottom of the upper adjacent segment.Further,the displacement impedance at the pile head is obtained based on the impedance function transfer technique.Finally,the reliability of the proposed solution is verified,followed by a sensitivity analysis concerning the coupling effect of the pile parameters,construction disturbance and the vertical support of the surrounding soil on the displacement impedance of the pile.

关键词： tapered pipe pile longitudinal vibration vertical support of the surrounding soil construction disturbance displacement impedance

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Recovering from prolonged cardiac arrest induced by electric shock:A case report

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World Journal of Clinical Cases 2024年第13期12卷 2248-2253页

作者： Jian Zhang Yan-Ru Qiao Ya-Dong Yang Guo-Zheng pan chong-Qing Lv Department of General Surgery Shengli Oilfield Central HospitalDongying 257000Shandong ProvinceChina Department of Emergency Medicine Shengli Oilfield Central HospitalDongying 257000Shandong ProvinceChina

BACKGROUND Cardiac arrest(CA)induced by electric shock is a rare occurrence,particularly in cases of prolonged CA.Currently,there is limited literature on similar incidents,and we present a relevant case report.CASE SUMMARY A 27-year-old Asian male man,experiencing respiratory CA due to electric shock,was successfully restored to sinus rhythm after 50 min of cardiopulmonary resuscitation and 8 electrical defibrillation sessions.In the subsequent stages,the patient received multiple organ function protection measures,leading to a successful recovery and eventual discharge from the hospital.CONCLUSION Prolonging resuscitation time can enhance the chances of survival for patients,this study provide valuable insights into the management of electric shock-induced CA.

关键词： Electric shock Cardiac arrest Prolonged cardiopulmonary resuscitation Cerebral resuscitation Case report

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Effect of inflammatory response on joint function after hip fracture in elderly patients:A clinical study

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World Journal of Orthopedics 2024年第4期15卷 337-345页

作者： Jia-Ming Wang Yu-Tao pan Chen-Song Yang Ming-chong Liu Sheng-Chao Ji Ning Han Fang Liu Gui-Xin Sun Department of Traumatic Surgery Shanghai East HospitalSchool of MedicineTongji UniversityShanghai 200092China

BACKGROUND Excellent hip joint function facilitates limb recovery and improves the quality of survival.This study aimed to investigate the potential risk factors affecting postoperative joint functional activity and outcomes in elderly hip fractures patients and to provide evidence for patient rehabilitation and clinical management.AIM To explore the relationship between inflammatory factors and hip function and the interaction between inflammation and health after hip fracture in elderly patients.METHODS The elderly patients who had hip fracture surgery at our hospital between January 1,2021,and December 31,2022 were chosen for this retrospective clinical investigation.Patients with excellent and fair postoperative hip function had their clinical information and characteristics gathered and compared.Age,gender,fracture site,surgical technique,laboratory indices,and other variables that could have an impact on postoperative joint function were all included in a univariate study.To further identify independent risk factors affecting postoperative joint function in hip fractures,risk factors that showed statistical significance in the univariate analysis were then included in a multiple logistic regression analysis.In addition to this,we also compared other outcome variables such as visual analogue scale and length of hospital stay between the two groups.RESULTS A total of 119 elderly patients with hip fractures were included in this study,of whom 37 were male and 82 were female.The results of univariate logistic regression analysis after excluding the interaction of various factors showed that there was a statistically significant difference in interleukin(IL)-6,IL-8,IL-10,C-reactive protein(CRP),and complement C1q(C1q)between the fair and excellent joint function groups(P20 pg/mL[Odds ratio(OR)3.070,95%CI:1.243-7.579],IL-8>21.4 pg/mL(OR 3.827,95%CI:1.498-9.773),CRP>10 mg/L(OR 2.142,95%CI:1.020-4.498)and C1q>233 mg/L(OR 2.339,95%CI:1.094-

关键词： Hip function Fracture Inflammatory factors Risk factors Prevention

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Wearable and interactive multicolored photochromic fiber display

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Light(Science & Applications) 2024年第3期13卷 454-465页

作者： pan Li Yuwei Wang Xiaoxian He Yuyang Cui Jingyu Ouyang Ju Ouyang Zicheng He Jiayu Hu Xiaojuan Liu Hang Wei Yu Wang Xiaoling Lu Qian Ji Xinyuan Cai Li Liu chong Hou Ning Zhou Shaowu pan Xiangru Wang Huamin Zhou Cheng-Wei Qiu Yan-Qing Lu Guangming Tao State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and Engineering and Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Vascular Aging(HUST) Ministry of EducationWuhan 430030China School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and ManipulationCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China School of Performing Arts Wuhan Conservatory of MusicWuhan 430060China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China School of Architecture and Urban Planning Huazhong University of Science and TechnologyWuhan 430074China School of Fashion Beijing Institute of Fashion TechnologyBeijing 100029China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Tongji Medical College Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Endowing flexible and adaptable fiber devices with light-emitting capabilities has the potential to revolutionize the current design philosophy of intelligent,wearable interactive devices.However,significant challenges remain in developing fiber devices when it comes to achieving uniform and customizable light effects while utilizing lightweight hardware.Here,we introduce a mass-produced,wearable,and interactive photochromic fiber that provides uniform multicolored light control.We designed independent waveguides inside the fiber to maintain total internal reflection of light as it traverses the fiber.The impact of excessive light leakage on the overall illuminance can be reduced by utilizing the saturable absorption effect of fluorescent materials to ensure light emission uniformity along the transmission direction.In addition,we coupled various fluorescent composite materials inside the fiber to achieve artificially controllable spectral radiation of multiple color systems in a single fiber.We prepared fibers on mass-produced kilometer-long using the thermal drawing method.The fibers can be directly integrated into daily wearable devices or clothing in various patterns and combined with other signal input components to control and display patterns as needed.This work provides a new perspective and inspiration to the existing field of fiber display interaction,paving the way for future human–machine integration.

关键词： fiber interactive colored

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On the electric behaviour of conductive grease inside the contact zone

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Friction 2024年第4期12卷 683-697页

作者： Yuxin ZHOU Jinjie LIU Xinming LI He chong Bo HAN Qinghua BAI SKF(Shanghai)Automotive Technologies Co. Ltd.Shanghai 201814China School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266250China

Conductive grease has been considered as a potential solution in addressing electric erosion issue inside motor bearings.Understanding the conductive grease performance,especially the electric and tribological behaviour is crucial for its application.This paper combines bulk grease characterization and contact film study considering both electrical and tribological loading conditions.The results show that the electric performance for the selected conductive grease sample is electric field dependent,including both frequency and voltage amplitude.Its film impedance inside the contact area is closely related to the external electric field,running condition,and lubrication regime.The following film impedance calculation tells that not only bulk grease electric parameters,but the contact parameter,lubricant film contour and lubrication condition should be considered when performing the overall bearing electrical modelling.

关键词： Electric erosion lubricant conductivity grease film impedance

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磁声耦合:物理、材料与器件

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物理学报 2024年第5期73卷 1-23页

作者：陈崇马铭远潘峰宋成清华大学材料学院先进材料教育部重点实验室北京100084

固体中的声波有两种传播方式:一种是声体波,以纵波或横波的形式在固体内部传播;另一种是声表面波,在固体表面产生并沿着表面传播.声波射频技术利用这些声波来截取和处理信号,尤其体现在快速发展的射频滤波器技术中.声学滤波器因其体积... 详细信息

固体中的声波有两种传播方式:一种是声体波,以纵波或横波的形式在固体内部传播;另一种是声表面波,在固体表面产生并沿着表面传播.声波射频技术利用这些声波来截取和处理信号,尤其体现在快速发展的射频滤波器技术中.声学滤波器因其体积小、成本低和性能稳定等多方面的优势,在移动通信等领域得到了广泛应用.受益于成熟的制造工艺和确定的共振频率,声波已逐渐成为操控磁性和自旋的有力手段,这一领域正朝着小型化、超快和节能的自旋电子学器件应用迈进.将磁性材料集成到声学射频器件,也开辟了对声学器件调控方法和性能提升的新思路.本综述首先梳理了各种磁声耦合的物理机制,并在此基础上系统介绍了声控磁化动力学、磁化翻转、磁畴和磁性斯格明子产生及运动、自旋流产生等一系列磁性和自旋现象.同时也讨论了声控磁的逆过程——磁控声波的研究进展,包括声波参数的磁调控和声波的非互易传播,以及基于此开发的新型磁声器件,如磁传感器、磁电天线、可调谐滤波器等.最后展望了磁声耦合未来可能的研究方向和潜在的应用前景.

关键词：磁弹耦合声控磁性磁控声波磁声器件

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A Comparative Study of Myocardial Damage Caused by Novel Coronavirus Infection and Influenza A Virus Infection in Children during the COVID-19 Epidemic Period

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Advances in Infectious Diseases 2024年第2期14卷 338-345页

作者： chong Liang Guosheng Su Chunhong Qiu Lihua Qin Yongkang Li Jide Huang Fangyue pan Fengming Meng Huarong pan Chunjiao Nong Yulin Red Cross Hospital Yulin China Peoples Hospital of Guangxi-ASEAN Economic and Technological Development Zone (Nanning Tenth Peoples Hospital) Nanning China Yulin Second Peoples Hospital Yulin China Baise Maternal and Child Health Hospital Baise China

Objective: To explore the comparative study of myocardial damage in children infected with COVID-19 and influenza A virus during the COVID-19 pandemic. Method: Retrospective analysis of myocardial injury caused by COVID-19 infection and influenza A virus infection in children during the COVID-19 from October 2022 to May 2023, including 106 cases of COVID-19 infection, that is, the COVID-19 group;And 164 cases of influenza A virus infection, namely, H1N1 group;Two groups were tested for various indicators of myocardial enzyme spectrum, and the situation of myocardial injury was compared between the two groups. Result: In the enrolled cases, there was no statistically significant difference in the prevalence rate of men and women in the COVID-19 group (P > 0.05);There was no statistically significant difference in the average age between men and women (P > 0.05);The comparison of the incidence rates between males and females in the H1N1 group showed a statistically significant difference (P 0.05);There was no statistically significant difference in the average age between the two groups of girls (P > 0.05). A comparison between two groups of various indicators of myocardial enzyme spectra showed that the results of AST, -HBDH and LDH were statistically significant (P 0.05). Conclusion: Both COVID-19 infection and influenza A virus infection in children have different degrees of myocardial damage, but COVID-19 infection causes more myocardial damage than influenza A virus infection, and influenza A virus is more prone to myocardial infarction, which deserves our attention.

关键词： COVID-19 COVID-19 Infection Influenza A Myocardial Damage

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改革开放以来清末川边治理研究鸟瞰

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西藏研究 2024年第1期 123-130,159页

作者：潘崇蒋小迪福建师范大学社会历史学院福州350117

清末,随着西南边防危机日趋严峻,清政府着意强化对川边地区的经营与管控,成为西南边防构建与川边藏区治理史上的重要一页。改革开放以来,学界关于清末川边治理的研究不断推进,取得长足进展,主要表现为专题性深研逐渐取代宏观性审视、研... 详细信息

清末,随着西南边防危机日趋严峻,清政府着意强化对川边地区的经营与管控,成为西南边防构建与川边藏区治理史上的重要一页。改革开放以来,学界关于清末川边治理的研究不断推进,取得长足进展,主要表现为专题性深研逐渐取代宏观性审视、研究队伍不断壮大等方面,成为清末西南边政史研究园地中的一朵靓丽鲜花。总结过往,可得出目前清末川边治理研究在史料拓展、问题设计以及研究视角、学科交融等方面尚有若干不足。

关键词：改革开放清末川边治理

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Effects of surface shapes on properties of turbulent/non-turbulent interface in turbulent boundary layers

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Science China(Technological Sciences) 2020年第2期63卷 214-222页

作者： WU Di WANG JinJun CUI GuangYao pan chong Fluid Mechanics Key Laboratory of Education Ministry Beijing University of Aeronautics and AstronauticsBeijing 100191China

The effects of directional riblets surfaces on the turbulent/non-turbulent(T/NT) interface in turbulent boundary layers are experimentally investigated using two-dimensional time-resolved particle image velocimetry(PIV). The velocity field of streamwise-wall-normal plane for the smooth surface, converging and diverging riblets surfaces are measured. The interface is detected using the criterion of local kinetic energy. The statistical properties of interface height and conditional averaged velocity for different surfaces are analyzed. It is shown that, the converging and diverging riblets surfaces have little effect on the fractal dimension of the T/NT interface, but they cause the intermittency profile deviate from error function and the probability distribution of interface height deviate from Gaussian function. To be specific, the distribution of interface height for the converging riblets surface shows a positive skewness while it shows a negative skewness for the diverging riblets surface.Moreover, the conditional averaged streamwise velocity and spanwise vorticity across the interface are analyzed, and it is found that their self-similarities are preserved for different surfaces when normalized with respective friction velocity. The correlation analysis reveals that near-wall streamwise velocity fluctuation and interface height show a negative correlation.

关键词： riblets surface turbulent boundary layers turbulent/non-turbulent(T/NT)interface conditional averaging

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Effects of sinusoidal leading edge on delta wing performance and mechanism

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Science China Technological Sciences 2013年第3期56卷 772-779页

作者： CHEN Huang pan chong WANG JinJun Fluid Mechanics Key Laboratory of Ministry of Education Beihang University

Lift and drag characteristics of delta wings with low swept angle and various sinusoidal leading edges(SLE) were investigated in a wind tunnel.Three amplitudes and three wavelengths of SLE were tested.It is revealed that,in comparison with the baseline case,when the leading-edge amplitude A?5%C(root chord length of a delta wing),the stall of the delta wing can be delayed without penalty on the maximum lift coefficient;meanwhile,the lift-to-drag ratio was kept nearly unchanged.These are beneficial to aircraft maneuverability and agility.Surface oil and hydrogen-bubble flow visualization experiments were further conducted to provide a general view of the underlying flow mechanism of SLE on delta wings.It was found that,for the flow over delta wing with SLE,vortices were generated from every crest of SLE,in contrast to the dual leading-edge vortex structure generated from the apex of the base wing.At high angle of attack,the breakdown of those vortices originating from the crests of SLE may provide additional turbulent kinetic energy to the flow,resulting in the increase of the flow reattachment region on the leeward side,therefore the stall can be delayed.

关键词： delta wing sinusoidal leading edge aerodynamic performance leading-edge vortex

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