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Risk factors for postpartum posttraumatic stress disorder after emergency admission

World Journal of Emergency Medicine 2024年第2期15卷 121-125页

作者： Fengxia Du jun zha Yan Li Lichao Fang Shuyu Xia Youjia Yu Department of Obstetrics Suzhou Xiangcheng People’s HospitalSuzhou 215131China Department of Anesthesiology the Second Affiliated Hospital of Wannan Medical CollegeWuhu 241000China Department of Anesthesiology Suzhou Xiangcheng People’s HospitalSuzhou 215131China Department of Emergency and Intensive Care Unit Suzhou Xiangcheng People’s HospitalSuzhou 215131China

BACKGROUND:Postpartum posttraumatic stress disorder(PTSD)can occur in women who give birth after emergency admission.The identification of risk factors for this condition is crucial for developing effective preventive measures.This retrospective study aimed to explore the incidence and risk factors for postpartum PTSD in women who give birth after emergency admission.METHODS:Medical records of women who gave birth after emergency admission were collected between March 2021 and April 2023.The patients’general conditions and perinatal clinical indicators were recorded.The puerperae were divided into PTSD group and control group based on symptom occurrence at six weeks postpartum.Multivariate logistic regression analysis was performed to identify risk factors.RESULTS:A total of 276 puerperae were included,with a PTSD incidence of 20.3% at six weeks postpartum.Multivariate logistic regression analysis identified emergency cesarean section(odds ratio[OR]=2.102;95%confidence interval[CI]:1.114-3.966,P=0.022),admission to the emergency department after midnight(12:00 AM)(OR=2.245;95%CI:1.170-4.305,P<0.001),and cervical dilation(OR=3.203;95%CI:1.670–6.141,P=0.039)as independent risk factors for postpartum PTSD.Analgesia pump use(OR=0.500;95%CI:0.259–0.966,P=0.015)was found to be a protective factor against postpartum PTSD.CONCLUSION:Emergency cesarean section,admission to the emergency department after midnight,and cervical dilation were identified as independent risk factors for postpartum PTSD,while analgesic pump use was a protective factor.These findings provide insights for developing more effective preventive measures for women who give birth after emergency admission.

关键词： Risk factors Posttraumatic stress disorder Emergency Delivery

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Synergistically enhanced dielectric, insulating and thermally conductive performances of sandwich PMMA based dielectric films

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Progress in Natural Science:Materials International 2024年第3期34卷 591-597页

作者： Dongmei zhang Yufan Li Yuchao Li Zhonggui Sun Hanxue Zhu Lujia Yang Yanhu zhan Yankai Li Shi Wang jun-Wei zha School of Mathematical Sciences Liaocheng University School of Materials Science and Engineering Liaocheng University State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications School of Chemistry and Biological Engineering University of Science and Technology Beijing

A tri-layered(B-G-B) dielectric films were simply prepared by alternatively spin-coating boron nitride/polymethylmethacrylate(BN/PMMA, B) and graphene nanosheets(GNS/PMMA, G) compound solutions. The structure, morphology, thermal conductivity, and particularly the dielectric and relaxation behaviors were systematically studied. Results showed that a good exfoliation and dispersion of BN and GNS can be simply achieved through intensive mechanical compounding with PMMA in the internal mixer. The dielectric constant and breakdown strength of the obtained 1-3-1(B-G-B) sandwich composite film reached 4.3(@1 kHz) and 458.6kV/mm, being 119 % and 113 % higher than that of pure PMMA, respectively. Furthermore, the overall thermal conductivity of sandwich 1-3-1 composite increased by 112 % due to the addition of thermally conductive BN and GNS. The sandwich design strategy provided an effective way of achieving good permittivity, high insulation, and improved thermal conductivity simultaneously, showing potential applications in the miniaturization and integration of electronic devices.

关键词： Breakdown strength Composites Dielectric constant Sandwich structure Thermal conductivity

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Multi-dimensional controllability analysis of precision ball bearing integrity

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Advances in Manufacturing 2023年第4期11卷 682-693页

作者： Lai Hu jun zha Wei-Hua zhao Xiao-Fei Peng Yao-Long Chen School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an710049People’s Republic of China State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an710054People’s Republic of China Luoyang Bearing Science and Technology Co. Ltd.Luoyang471039HenanPeople’s Republic of China

Many factors affect the integrity of precision ball bearings.In this study,the multi-dimensional controllability of precision ball bearings produced in different company brands(bearing A and bearing B)were studied and compared.The geometric errors(flatness,parallelism,roundness and cylindricity of inner and outer rings,roundness,groove and roughness of inner and outer rings)and vibration errors of bearings were analyzed.Concurrently,the residual stress,residual austenite content,element content ratio,metamorphic layer and temperature-vibration displacement coupling test were also analyzed.Based on the above analysis conclusion,the bearing fatigue life test was carried out for 2150 h.The reliability of the conclusion is proved again as follows.When the residual austenite content in the raceway of precision ball bearing is 10%,the axial residual stress is 877.4 MPa;the tangential residual stress is 488.1 MPa;the carbon content is 6%;the test temperature of bearing is the lowest;and the service life is prolonged.

关键词： Precision ball bearing Controllability Geometric errors Carbon content Residual austenite Residual stress

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Recent Progress on Aeroelasticity of High-Performance Morphing UAVs

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Computer Modeling in Engineering & Sciences 2022年第10期133卷 1-29页

作者： Binbin Lv jun zha Kaichun Zeng Hongtao Guo Li Yu Peng zhang Institute of High Speed Aerodynamics China Aerodynamics Research and Development CenterMianyang621000China

The high-performance morphing aircraft has become a research focus all over the world.The morphing aircraft,unlike regular unmanned aerial vehicles(UAVs),has more complicated aerodynamic characteristics,making itmore difficultto conduct its design,model analysis,and experimentation.This paper reviews the recent process and the current status of aeroelastic issues,numerical simulations,and wind tunnel test of morphing aircrafts.The evaluation of aerodynamic characteristics,mechanism,and relevant unsteady dynamic aerodynamicmodeling throughout the morphing process are the primary technological bottlenecks formorphing aircrafts.The unstable aerodynamic forces have a significant impact on the aircraft handling characteristics,control law design,and flight safety.In the past,the structural analysis of morphing aircrafts,flight dynamics modeling,computational mesh morphing technology,and aerodynamic calculation were performed in promoting the development of next generation UAVs,with nonlinear dynamic challenges includingtransonic aeroelastic problems and high angle of attack aeroelastic problems.At present,many facets of these difficulties,together with the accompanying numerical simulation studies,remain under-explored.In addition,wind tunnel experiments face significant challenges in the dynamic morphing process.Finally,dynamic unsteady aerodynamic characteristics in the continuous morphing process still need to be verified by more related experiments.

关键词： Morphing aircraft aeroelasticity numerical simulation wind tunnel test

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薛汉荣教授运用代赭石治疗肺病喘咳的临床经验探讨

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中医临床研究 2024年第8期16卷 33-38页

作者：查军袁欣薛汉荣江西中医药大学江西南昌330006 江西中医药大学附属医院江西南昌330006

薛汉荣教授师从国医大师洪广祥教授,在从医多年间积累了丰富的临床经验,特别是在治疗肺系疾病方面有独特的临床见解与感悟,文章在此对薛汉荣教授运用代赭石治疗肺病喘咳的临床经验做了初步探析与总结,以飨同道。文章涉及的证型全面广泛... 详细信息

薛汉荣教授师从国医大师洪广祥教授,在从医多年间积累了丰富的临床经验,特别是在治疗肺系疾病方面有独特的临床见解与感悟,文章在此对薛汉荣教授运用代赭石治疗肺病喘咳的临床经验做了初步探析与总结,以飨同道。文章涉及的证型全面广泛,其中包括虚性喘咳、虚实夹杂性喘咳及实性喘咳三种,喘咳主要涉及的脏腑有肺、肾、胃及肝脏,虚性喘咳的病位以肺肾为主,其中肾虚又包括肾阴、肾阳以及肾气亏虚所致喘咳,肺虚者以气虚为主。对于虚实夹杂者,重点强调胃虚痰阻型以及肝阳上亢型,分别以旋覆代赭汤和镇肝熄风汤为代表方联合代赭石加味进行治疗,代赭石作用多样,依据配伍方药的君、臣、佐、使的不同而变化,所以在这两个经典方剂中作用的侧重点各有不同。对于实喘者,薛汉荣教授多强调治痰的重要性,代赭石下气、降痰,联合疏肝调肝法,一升一降使肝肺升降气机之枢纽调达,气机调和,气血津液调畅,则痰瘀之病理产物得消,喘咳自解。喘咳之证诸多,涉及的脏腑也非独有肺脏,重点是有效利用代赭石降肺胃上逆之气,善泻有余之火,质重向下引药达病所,平肝潜阳、降痰邪的特性,再按患者病情需要有目的地将不同药物进行组合配伍来增强原有疗效、提高主药疗效以及避免药物的不良反应。

关键词：代赭石喘咳临床经验

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电缆绝缘材料交联聚乙烯的老化及寿命调控

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物理学报 2024年第7期73卷 28-39页

作者：王江琼李维康张文业万宝全查俊伟北京科技大学化学与生物工程学院北京材料基因工程高精尖创新中心北京100083 北京智慧能源研究院北京102211 北京科技大学顺德创新学院佛山528300

交联聚乙烯(cross-linked polyethylene,XLPE)因其优异的力学性能和绝缘性能广泛应用于电力电缆领域中,但在高压电缆的运行过程中XLPE不可避免会受到电老化、热老化和电-热联合老化的影响,使得材料的性能和寿命下降,因此需要对XLPE的老... 详细信息

交联聚乙烯(cross-linked polyethylene,XLPE)因其优异的力学性能和绝缘性能广泛应用于电力电缆领域中,但在高压电缆的运行过程中XLPE不可避免会受到电老化、热老化和电-热联合老化的影响,使得材料的性能和寿命下降,因此需要对XLPE的老化性能和使用寿命进行调控.本文介绍了XLPE的结构特性和交联机理,系统分析了其老化过程及影响机制,并概述了接枝、共混和纳米粒子改性等调控策略,同时基于寿命评估模型探究了XLPE因老化而导致的寿命衰减问题.最后,展望了调控XLPE电缆绝缘材料使用寿命策略的未来方向,为XLPE电缆绝缘材料的进一步改进和长期稳定运行提供理论指导.

关键词：交联聚乙烯交联机理耐老化性能长寿命

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城市更新背景下区域整体开发与设计总控模式研究

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城市建筑空间 2024年第5期31卷 92-94页

作者：查君田逸飞华东建筑设计研究院有限公司华东建筑设计研究院有限公司规划中心

区域整体开发指一定范围、时限内,一级开发商或政府主管部门组织托底,多业主参与,统一规划设计、建设管理的集约开发建设模式。总结政府主导、市场主导、政企合作3种区域整体开发模式,结合实践项目,探索不同区域整体开发模式下设计总控... 详细信息

区域整体开发指一定范围、时限内,一级开发商或政府主管部门组织托底,多业主参与,统一规划设计、建设管理的集约开发建设模式。总结政府主导、市场主导、政企合作3种区域整体开发模式,结合实践项目,探索不同区域整体开发模式下设计总控的模式、方法及主要工作内容,以期为其他城市区域整体开发提供参考。

关键词：城市更新区域整体开发设计总控

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三明治结构柔性储能电介质材料研究进展

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物理学报 2024年第2期73卷 2-13页

作者：李雨凡薛文清李玉超战艳虎谢倩李艳凯查俊伟聊城大学材料科学与工程学院聊城252059 北京科技大学化学与生物工程学院北京100083

聚合物电介质材料因其高功率密度、耐击穿、安全柔韧、易加工和自愈性等特点,被广泛应用于智能电网、新能源汽车、航空航天、国防科技等领域.其中,基于三明治结构设计获得具有更高储能密度和储能效率的柔性电介质材料成为近年来聚合物... 详细信息

聚合物电介质材料因其高功率密度、耐击穿、安全柔韧、易加工和自愈性等特点,被广泛应用于智能电网、新能源汽车、航空航天、国防科技等领域.其中,基于三明治结构设计获得具有更高储能密度和储能效率的柔性电介质材料成为近年来聚合物储能电介质领域的研究热点和常用策略.本文从电介质的材料构成、结构设计以及制备方法等角度综述了基于三明治结构聚合物电介质薄膜在储能密度提升方面的研究进展,阐述了三明治结构电介质材料性能调控的微观机制和协同增强机理,并展望了其发展趋势和应用前景.

关键词：柔性三明治储能电介质研究进展

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Simulation and Experimental Analysis of Vortex Tube Using Steel Material

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Open Journal of Fluid Dynamics 2020年第3期10卷 151-163页

作者： Muhammad Bilal Yaolong Chen jun zha Naveed Ullah School of Mechanical Engineering Xi’an Jiaotong University Xi’an China State Key Laboratory for Manufacturing System Engineering Xi’an Jiaotong University Xi’an China

Experimental and computational fluid dynamics (CFD) are investigated through the vortex tube system. The benefit of vortex tube is a counter flow type tube, which has further designed and fabricated for investigation. The whole set up is consisting of a simple device that can separate a single stream of compressed air into two streams;one is at high temperature and the other is lower temperature following an inlet gas stream. The advantages of this tube are their compactness, safety, and low equipment cost mainly used in cooling and heating applications. This study addressed three-dimensional flows;the domain is using computational fluid dynamics (CFD) method and experimental approach to optimize the direction of RHVT. Through the CFD analysis, the best cold end diameter (dc), number of nozzles, and the best parameters for obtaining the highest hot gas temperature and lowest cold gas temperature were obtained and verified by experimental procedures.

关键词： Ranque-Hilsch Vortex Tube Design Analysis & Fabrication Experimental of Vortex Tube Steel Material

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PTEN inhibitor bisperoxovanadium protects against noise-induced hearing loss

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Neural Regeneration Research 2023年第7期18卷 1601-1606页

作者： Bei Fan Fei Lu Wei-Jia Du jun Chen Xiao-Gang An Ren-Feng Wang Wei Li Yong-Li Song Ding-jun zha Fu-Quan Chen Department of Otolaryngology Head and Neck Surgery Xijing HospitalFourth Military Medical UniversityXi’anShaanxi ProvinceChina

Studies have shown that phosphatase and tensin homolog deleted on chromosome ten(PTEN)participates in the regulation of cochlear hair cell survival.Bisperoxovanadium protects against neurodegeneration by inhibiting PTEN expression.However,whether bisperoxovanadium can protect against noise-induced hearing loss and the underlying mechanism remains unclear.In this study,we established a mouse model of noise-induced hearing loss by exposure to 105 dB sound for 2 hours.We found that PTEN expression was increased in the organ of Corti,including outer hair cells,inner hair cells,and lateral wall tissues.Intraperitoneal administration of bisperoxovanadium decreased the auditory threshold and the loss of cochlear hair cells and inner hair cell ribbons.In addition,noise exposure decreased p-PI3K and p-Akt levels.Bisperoxovanadium preconditioning or PTEN knockdown upregulated the activity of PI3K-Akt.Bisperoxovanadium also prevented H_(2)O_(2)-induced hair cell death by reducing mitochondrial reactive oxygen species generation in cochlear explants.These findings suggest that bisperoxovanadium reduces noise-induced hearing injury and reduces cochlear hair cell loss.

关键词： acoustic trauma Akt oxidative stress bisperoxovanadium cochlear hair cells loss inner hair cell ribbons loss noise exposure permanent threshold shift phosphatase and tensin homologue deleted on chromosome ten phosphatidylinositol 3 kinase siPTEN

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