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Changes in physical activity and sleep following the COVId-19 pandemic on a university campus:Perception versus reality

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Sports Medicine and Health Science 2024年第3期6卷 246-251页

作者： Bryce t.daniels Samantha Robinson Ivan Vargas Jamie I.Baum Erin K.Howie University of Arkansas FayettevilleARUnited States Rush University Medical Center ChicagoIllinoisUnited States1 University of Arkansas System division of Agriculture FayettevilleARUnited States

It has been hypothesized that key lifestyle behaviors of physical activity and sleep worsened in response to the Coronavirus disease(COVId-19)***,there have been inconsistencies in findings of changes in these key lifestyle behaviors across populations likely due to the wide variety of assessment *** purpose of the study was to compare physical activity and sleep before and after the COVId-19 pandemic using accelerometers and self-reported behaviors.A longitudinal follow-up was conducted on students,faculty,and staff at a university campus in the United *** the periods before March 2020(covering the academic years of 2018–2019 or 2019–2020)and again in April–June 2021,participants completed surveys to evaluate their physical activity and sleep behaviors and wore an accelerometer.A total of 44 participants completed the survey at both timepoints and 32 completed accelerometer assessment at both ***-seven percent of participants reported a perceived decline in physical activity,while 30%reported a worsening in *** selfreported data,overall physical activity did not change,but there was a decrease in active transport(pd increase in domestic physical activity(p?0.012).Sleep quality decreased as evidenced by an increase in Pittsburgh Sleep Quality Index scores(p?0.045).there were no changes in accelerometer measured physical activity or *** were no changes in physical or mental *** perceptions of physical activity declined from prior to the COVId-19 pandemic,there were no changes in device-measured physical activity,and changes in self-reported physical activity differed by domain.

关键词： Movement Longitudinal Measurement

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基于极限分析上限法的地震作用下分层地基盾构隧道开挖面稳定性研究

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岩土力学 2024年第4期45卷 1201-1213页

作者：张治国罗杰朱正国 PAN Y t 孙苗苗上海理工大学环境与建筑学院上海200093 石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室河北石家庄050043 新加坡国立大学土木与环境工程系新加坡119077 浙大城市学院土木工程系浙江杭州310015 浙大城市学院城市基础设施智能化浙江省工程研究中心浙江杭州310015

目前针对盾构隧道开挖面稳定性的研究还较少考虑土体分层特性和地震作用的耦合影响,因此构建了一种在分层土体中考虑地震作用的开挖面三维对数螺旋破坏模型进行研究。首先,将地震引起的动态响应通过拟静力法简化为水平和竖直两个方向上... 详细信息

目前针对盾构隧道开挖面稳定性的研究还较少考虑土体分层特性和地震作用的耦合影响,因此构建了一种在分层土体中考虑地震作用的开挖面三维对数螺旋破坏模型进行研究。首先,将地震引起的动态响应通过拟静力法简化为水平和竖直两个方向上的惯性力作用;其次,在均质土体中的三维对数螺旋破坏机制的基础上,将其改进为适用于分层土体的三维对数螺旋破坏机制;再次,根据上限定理,在虚功率方程中引入地震惯性力所做功率,得到考虑土体分层特性和地震作用条件下的盾构隧道开挖面支护力的上限解;最后,将上限理论解与三维数值模拟结果和既有模型试验结果进行对比,得到了较好的一致性。此外,针对水平地震加速度系数和地层厚度对关键物理特征进行了影响因素分析。结果表明,当比例系数ζ>0时,极限支护力随水平地震加速度系数的增大显著增大;当ζ<0时,极限支护力随水平地震加速度系数增大而增大的趋势减弱。当水平地震加速度系数kh=0时,即在无地震作用情况下,归一化极限支护力不随ζ的变化而变化;在上硬下软土层中,下部土层厚度比的增大会引起极限支护力的增大,在上软下硬土层中,下部土层厚度比的增大会引起极限支护力的减小。

关键词：盾构隧道开挖面稳定性地震作用分层土体上限定理

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流星进入的可变形不规则离散元分析方法

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Acta Mechanica Sinica 2024年第1期40卷 305-320页

作者：李姿雯曾祥远 Kyle t.Alfriend 冯程帆温童歌 School of Automation Beijing Institute of TechnologyBeijing 100081China texas A&M University College StationTX 77840USA

流星进入地球大气层时会发生空中解体和爆炸,威胁地球局部区域乃至全球安全针对流星进入大气演化的超高速动力学仿真研究具有重要意义.为提高预报的精确性,应关注流星体内部结构和非均匀烧蚀等对演化过程和解体后碎片运动的影响。本文... 详细信息

流星进入地球大气层时会发生空中解体和爆炸,威胁地球局部区域乃至全球安全针对流星进入大气演化的超高速动力学仿真研究具有重要意义.为提高预报的精确性,应关注流星体内部结构和非均匀烧蚀等对演化过程和解体后碎片运动的影响。本文提出了一种可变形不规则离散元方法,用于仿真分析流星进入大气层时轨迹和姿态变化、烧蚀、解体和爆轰等现象。利用多面体离散元模型可模拟不同结构的异质流星;通过拉伸多面体模型顶点,仿真流星的粗糙外形和烧蚀形变;利用Jones-Wilkins-Lee状态方程计算烧蚀产生的集中爆轰产物的压力.以Chelyabinsk流星事件中发生轨迹偏离的碎片为例,数值仿真集中爆轰产物的膨胀驱动作用对碎片运动方向和轨迹演化的影响.仿真结果表明,碎片弹出轨迹特征和烧蚀剩余质量均在观测值范围内,验证了新方法的有效性.

关键词：地球大气层多面体模型离散元方法离散元模型爆轰产物全球安全空中解体驱动作用

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Polariton lasing in Mie-resonant perovskite nanocavity

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Opto-Electronic Advances 2024年第4期7卷 27-42页

作者： Mikhail A.Masharin daria Khmelevskaia Valeriy I.Kondratiev daria I.Markina Anton d.Utyushev dmitriy M.dolgintsev Alexey d.dmitriev Vanik A.Shahnazaryan Anatoly P.Pushkarev Furkan Isik Ivan V.Iorsh Ivan A.Shelykh Hilmi V.demir Anton K.Samusev Sergey V.Makarov UNAM-Institute of Materials Science and Nanotechnology National Nanotechnology Research CenterDepartment of Electrical and Electronics EngineeringDepartment of PhysicsBilkent UniversityAnkara 06800Turkey ItMO University School of Physics and EngineeringSt.Petersburg 197101Russia Abrikosov Center for theoretical Physics MIPTDolgoprudnyiMoscow Region 141701Russia LUMINOUS!Center of Excellence for Semiconductor Lighting and displays School of Electrical and Electronic EngineeringSchool of Physical and Mathematical SciencesSchool of Materials Science and EngineeringNanyang Technological UniversitySingapore 639798Singapore department of Physics Engineering Physics and AstronomyQueen’s UniversityKingstonOntario K7L 3N6Canada Science Institute University of IcelandDunhagi 3IS-107ReykjavikIceland Experimentelle Physik 2 Technische Universität DortmundDortmund 44227Germany Qingdao Innovation and development Center Harbin Engineering UniversityQingdao 266000China

deeply subwavelength lasers(or nanolasers)are highly demanded for compact on-chip bioimaging and sensing at the *** of the main obstacles for the development of single-particle nanolasers with all three dimensions shorter than the emitting wavelength in the visible range is the high lasing thresholds and the resulting *** we ex-ploit exciton-polariton condensation and mirror-image Mie modes in a cuboid CsPbBr3 nanoparticle to achieve coherent emission at the visible wavelength of around 0.53μm from its ultra-small(≈0.007μm3 or≈λ3/20)semiconductor *** polaritonic nature of the emission from the nanocavity localized in all three dimensions is proven by direct com-parison with corresponding one-dimensional and two-dimensional waveguiding systems with similar material *** a deeply subwavelength nanolaser is enabled not only by the high values for exciton binding energy(≈35 meV),re-fractive index(>2.5 at low temperature),and luminescence quantum yield of CsPbBr3,but also by the optimization of po-laritons condensation on the Mie resonances with quality factors improved by the metallic ***,the key parameters for optimal lasing conditions are intermode free spectral range and phonons spectrum in CsPbBr3,which govern polaritons condensation *** chemically synthesized colloidal CsPbBr3 nanolasers can be potentially de-posited on arbitrary surfaces,which makes them a versatile tool for integration with various on-chip systems.

关键词： nanolaser perovskite polariton Mie resonance exciton-polariton

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Critical considerations for the management of acute abdomen in transplant patients

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World Journal of transplantation 2024年第2期14卷 8-12页

作者： Efstathios t Pavlidis Georgios Katsanos Athanasios Kofinas Georgios tsoulfas Ioannis N Galanis theodoros E Pavlidis the 2^(nd)department of Propaedeutic Surgery Hippokration General HospitalSchool of MedicineAristotle University of ThessalonikiThessaloniki 54642Greece department of transplantation Surgery Center for Research and Innovation in Solid Organ TransplantationAristotle University of ThessalonikiSchool of MedicineThessaloniki 54642Greece

the number of solid organ transplantations performed annually is increasing and are increasing in the following order:Kidney,liver,heart,lung,pancreas,small bowel,and uterine ***,the outcomes of transplants are impro-ving(organ survival>90%after the 1st year).therefore,there is a high probability that a general surgeon will be faced with the management of a transplant patient with acute *** problems in immunocompromised patients may not only include graft-related problems but also nongraft-related *** perioperative regulation of immunosuppression,the treatment of accompanying problems of immunosuppression,the administration of cortisol and,above all,the realization of a rapidly deteriorating situation and the accurate evaluation and interpretation of clinical manifestations are particularly important in these *** perioperative assessment and preparation includes evaluation of the patient’s cardiovascular system and determining if the patient has hypertension or suppression of the hypothalamic-pituitary-adrenal axis,or if the patient has had any coagulation mechanism abnormalities or thromboembolic *** in transplant patients is associated with the use of calci-neurin inhibitors,corticosteroids,and antiproliferation *** times,the clinical picture is atypical,resulting in delays in diagnosis and treatment and leading to increased morbidity and *** computed tomo-graphy is of utmost importance for early diagnosis and *** recipients are prone to infections,especially specific infections caused by cytomegalovirus and Clostridium difficile,and they are predisposed to intraop-erative or postoperative complications that require great care and *** is necessary to follow evidence-based therapeutic ***,it is required that the clinician choose the correct therapeutic plan for the patient(conservative,emergency open surgery or minimally invasive s

关键词： Acute abdomen Abdominal emergency surgery transplantation Immunocompromised patients Immuno-suppression Posttransplantation surgery

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可编程多物理机制的力学超材料

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力学进展 2024年

作者： P.Sinha t.Mukhopadhyay 印度理工学院航空工程系英国南安普顿大学工学院

力学超材料是一种有别于传统力学行为的工程材料，它源于人工可编程的微结构以及材料的固有属性。在过去的十年中，随着计算性能和复杂微观结构制造能力的巨大进步，力学超材料已经吸引了研究人员的广泛关注，因为它能够实现自然界中不... 详细信息

力学超材料是一种有别于传统力学行为的工程材料，它源于人工可编程的微结构以及材料的固有属性。在过去的十年中，随着计算性能和复杂微观结构制造能力的巨大进步，力学超材料已经吸引了研究人员的广泛关注，因为它能够实现自然界中不可能出现的多重物理属性。该领域迅速崛起的趋势之一是将材料行为和单元结构与其他不同的多种物理因素(如电场或磁场)以及温度、光或化学反应等刺激相结合，从而扩大按需主动调制力学响应的范围。在本文中，我们旨在概述有关超材料的力学和多物理性质调制的相关文献，重点介绍双能级设计的新兴趋势，着重讨论力学超材料在关键工程领域应用中的巨大潜力。本文对该领域的发展趋势、挑战和未来路线进行了系统深入分析，涵盖实时可重构性和功能编程、4d打印、纳米超材料、人工智能和机器学习、多物理折纸/剪纸、活性物质、软物质和保形超材料、复杂微结构制造、服役寿命效应和可扩展性等概念。

关键词：力学超材料按需特性调制多物理力学可编程物质双级点阵主动超材料刺激响应材料

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Endophytic Occupation in Nodules of Rhynchosia Plants from Semiarid Regions of Argentina

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Phyton-International Journal of Experimental Botany 2024年第6期93卷 1081-1099页

作者： Cinthia t.Lucero María de los Á.Ruíz Fabiola Pagliero Carolina Castaño Mariela L.Ambrosino Graciela S.Lorda Facultad de Ciencias Exactas y Naturales Universidad Nacional de La PampaRuta Nacional 35km 330Santa RosaLa PampaCP6300Argentina INtA EEA Anguil“Ing.Agr.Guillermo Covas”Ruta Nacional 5 km 580AnguilLa PampaCC116326Argentina

Beneﬁcial microbes can improve soil health by promoting soil structure,nutrient cycling,and disease *** addition,a wide array of rhizospheric microbes are responsible for producing metabolically active compounds including various types of plant growth ***,microbial biodiversity studies could contribute to the improvement of agricultural practices in deprived areas,such as the Pampean semiarid *** vast majority of studies conducted on endophytic microorganisms have focused on intensive crop legume *** contrast,little attention has been paid to microorganisms of native legumes,whose ecology is not directly affected by human *** this study,endophytic microorganisms isolated from root nodules of a selected native legume of the genus Rhynchosia were *** isolates were studied with a focus on their plant growth-pro-moting rhizobacteria(PGPR)*** the edaphic characteristics of the Pampean semiarid region,the isolates obtained were evaluated for their ability to grow under three salt stress conditions(50,100,and 200 mM NaCl)and four different pH values(6,7,8,and 9).Based on their PGPR activities,the selected strains were phylogenetically grouped using *** results showed great variability among the isolates in terms of the characteristics *** legumes manifested a wide endophytic variability and remarkable perfor-mance in PGPR *** conclude that they could be used as potential bioinoculants for legume cultivation,an excellent alternative to the use of chemical fertilizers that currently pollute the environment.

关键词： Native strains endophytes PGPR native legumes stress

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techno-economic and Environmental Assessments of SAF from Bioamss:An Review

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林产化学与工业 2024年第5期44卷 29-51页

作者： MAHMOOd t.M.N.Saeed PANG Shusheng CHEN Qiang department of Chemical and Process Engineering University of CanterburyChristchurch 8140New Zealand Institute of Chemical Industry of Forest Products CAFKey Lab.of Biomass Energy and MaterialJiangsu ProvinceNanjing 210042China

this review presents a comprehensive techno-economic and life-cycle assessment of sustainable aviation fuel(SAF)production from *** critical need for transitioning towards environmentally sustainable alternatives for liquid fuel and aviation industry is first *** insights encompass the evolutionary progression of biofuel production from first-generation to second-generation biofuels,with a focus on utilizing non-food sources like woody biomass for enhanced *** data from the literature on techno-economic assessments of various SAF production pathways are analyzed including production costs,conversion efficiency,and ***,results of lifecycle assessments associated with different SAF production pathways are presented,providing essential insights for decision-making *** challenges of scaling up woody biomass-based SAF production are discussed based on the assessment results,and recommendations are proposed to steer stakeholders towards a greener and more sustainable trajectory for aviation operations.

关键词： sustainable aviation fuel woody biomass production costs minimum fuel selling price lifecycle assessment greenhouse gas emissions climate change

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Impact of sleep on gastrointestinal cancer

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World Journal of Clinical Oncology 2024年第6期15卷 677-683页

作者： Joshua Lo Pahnwat t taweesedt Makoto Kawai department of Internal Medicine Santa Clara Valley Medical CenterSan JoseCA 95128United States department of Psychiatry and Behavioral Sciences Stanford UniversityStanfordCA 94305United States Sierra Pacific Mental Illness Research Educationand Clinical Center(MIRECC)VA Palo Alto Health Care SystemPalo AltoCA 94304United States department of Psychiatry and Behavioral Sciences School of MedicineStanford UniversityRedwood CityCA 94063United States

Sleep problems have become a significant public health concern,affecting a large portion of the global population and have been linked to increased morbidity and *** incidence of gastrointestinal(GI)cancers continues to rise,posing a substantial burden on healthcare systems *** editorial aims to delve into the impact of sleep on GI cancers,including esophageal,gastric,colorectal,hepatobiliary,and pancreatic *** literature investigating the potential connections between GI cancers and sleep was *** considered aspects such as sleep duration,sleep disorders,and circadian rhythmicity,in order to explore the underlying mechanisms that can contribute to the development of GI cancers and propose avenues for future research.

关键词： Sleep Cancer Gastrointestinal cancer Esophagus Stomach Colon Liver

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Hepatic grooves:An observational study at laparoscopic surgery

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World Journal of Experimental Medicine 2024年第2期14卷 97-102页

作者： Shamir O Cawich dexter A thomas Fawwaz Mohammed Michael t Gardner Marlene Craigie Shaneeta Johnson Ramnanand S Kedambady department of Surgery University of the West IndiesSt Augustine 000000Trinidad and Tobago department of Surgery Port of Spain General HospitalPort of Spain 000000Trinidad and Tobago Section of Anatomy Basic Medical SciencesUniversity of the West IndiesKingston 000000Jamaica department of Radiology University of the West IndiesKingston 000000Jamaica department of Surgery Morehouse School of MedicineAtlantaGA 30310United States Section of Anatomy Department of Basic Medical SciencesUniversity of the West IndiesKingston KIN7Jamaica

BACKGROUNd In traditional descriptions,the upper surface of the liver is smooth and convex,but deep depressions are variants that are present in 5%-40%of *** sought to determine the relationship between surface depressions and the *** to use exploratory laparoscopy to determine the relationship between surface depressions and the *** An observational study was performed in all patients undergoing laparoscopic upper gastro-intestinal operations between January 1,2023 and January 20,2024.A thirty-degree laparoscope was used to inspect the liver and *** surface depressions were present,we recorded patient demographics,presence of diaphragmatic bands,rib protrusions and/or any other source of compression during *** Of 394 patients,343 had normal surface anatomy,and 51(12.9%)had prominent surface depressions on the *** was no significant relationship between the presence of surface depressions and gender nor the presence of rib ***,there was significant association between the presence of surface depressions and diaphragmatic muscular bands(Pth these data,the diaphragmatic-band theory has gained increased importance over other theories for surface *** studies are warranted using cross sectional imaging to confirm relationships with intersectional planes as well as beta-catenin assays in the affected liver parenchyma.

关键词： Liver Variant Vein Hepatic Surgery

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