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基于滑窗OPTICS算法和DATA-SSI算法的桥梁模态参数智能化识别

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振动与冲击 2024年第7期43卷 18-29页

作者：陈永高钟振宇罗晓峰浙江工业职业技术学院建筑工程学院浙江绍兴312000 浙江大学建筑工程学院杭州310058

针对现有基于数据驱动的随机子空间(data-driven stochastic subspace identification,DATA-SSI)算法存在的不足,无法实现稳定图中真假模态的智能化筛选,提出了一种新的模态参数智能化识别算法。首先通过引入滑窗技术来实现对输入信号... 详细信息

针对现有基于数据驱动的随机子空间(data-driven stochastic subspace identification,DATA-SSI)算法存在的不足,无法实现稳定图中真假模态的智能化筛选,提出了一种新的模态参数智能化识别算法。首先通过引入滑窗技术来实现对输入信号的合理划分,以避免虚假模态和模态遗漏现象的出现;其次通过引入OPTICS(ordering points to identify the clustering structure)密度聚类算法实现稳定图中真实模态的智能化筛选,最后将所提算法运用于某实际大型斜拉桥主梁结构的频率和模态振型识别过程中。结果表明,所提改进算法识别的频率值结果与理论值(MIDAS有限元结果)以及实际值(现场动力特性实测结果)间的误差均在5%以内,且识别的模态振型图与理论模态振型图具有很高的相似性。

关键词：桥梁结构随机子空间(SSI) 滑窗原理密度聚类算法稳定图

Fanlian Huazhuo Formula alleviates high-fat diet-induced nonalcoholic fatty liver disease by modulating autophagy and lipid synthesis signaling pathway

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World Journal of Gastroenterology 2024年第30期30卷 3584-3608页

作者： Meng-Yuan Niu Geng-Ting Dong Yi Li Qing luo Liu Cao Xi-Min Wang Qi-Wen Wang Yi-Ting Wang Zhe Zhang Xi-Wen zhong Wei-Bo Dai Le-Yu Li Pharmacology Laboratory Zhongshan Hospital of Traditional Chinese Medicine Affiliated to Guangzhou University of Traditional Chinese MedicineZhongshan 528400Guangdong ProvinceChina Department of Endocrinology Zhongshan Hospital of Traditional Chinese Medicine Affiliated to Guangzhou University of Traditional Chinese MedicineZhongshan 528400Guangdong ProvinceChina

BACKGROUND Fanlian Huazhuo Formula(FLHZF)has the functions of invigorating spleen and resolving phlegm,clearing heat and purging *** has been identified to have therapeutic effects on type 2 diabetes mellitus(T2DM)in clinical ***-alcoholic fatty liver disease(NAFLD)is frequently diagnosed in patients with ***,the therapeutic potential of FLHZF on NAFLD and the underlying mechanisms need further *** To elucidate the effects of FLHZF on NAFLD and explore the underlying hepatoprotective mechanisms in vivo and in *** HepG2 cells were treated with free fatty acid for 24 hours to induce lipid accumulation cell ***,experiments were conducted with the different concentrations of freeze-dried powder of FLHZF for 24 hours.C57BL/6 mice were fed a high-fat diet for 8-week to establish a mouse model of NAFLD,and then treated with the different concentrations of FLHZF for 10 *** FLHZF had therapeutic potential against lipid accumulation and abnormal changes in biochemical indicators in vivo and in *** experiments verified that FLHZF alleviated abnormal lipid metabolism might by reducing oxidative stress,regulating the AMPKα/SREBP-1C signaling pathway,activating autophagy,and inhibiting hepatocyte *** FLHZF alleviates abnormal lipid metabolism in NAFLD models by regulating reactive oxygen species,autophagy,apoptosis,and lipid synthesis signaling pathways,indicating its potential for clinical application in NAFLD.

关键词： Fanlian Huazhuo Formula Nonalcoholic fatty liver disease Autophagy Apoptosis AMPKα/SREBP-1C signal pathway Oxidative stress

Factors influencing further vertebral height loss following percutaneous vertebroplasty in osteoporotic vertebral compression fractures:A 1-year follow-up study

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World Journal of Clinical Cases 2024年第21期12卷 4609-4617页

作者： zhong-Qiu Tang Shao-Bo He Dong-Yang Yu Hai-Mao luo Xue-Hong Xing Yong-Wen Zhou Department of Spinal Surgery Affiliated Hospital of Panzhihua UniversityPanzhihua 617000Sichuan ProvinceChina Department of Shoulder and Elbow Surgery Affiliated Hospital of Panzhihua UniversityPanzhihua 617000Sichuan ProvinceChina

BACKGROUND Osteoporotic vertebral compression fractures(OVCFs)contribute to back pain and functional limitations in older individuals,with percutaneous vertebroplasty(PVP)emerging as a minimally invasive ***,further height loss post-PVP prompts investigation into contributing *** To investigate the factors associated with further height loss following PVP with cement augmentation in OVCF *** A total of 200 OVCF patients who underwent successful PVP between January 2021 and December 2022 were included in this study.“Further height loss”during 1 year of follow-up in OVCF patients with bone edema was defined as a vertical height loss of≥4 *** study population was divided into two groups for analysis:The“No Further Height Loss group(n=179)”and the“Further Height Loss group(n=21).”RESULTS In comparing two distinct groups of patients,significant differences existed in bone mineral density(BMD),vertebral compression degree,prevalence of intravertebral cleft(IVF),type of bone cement used,and cement distribution *** from binary univariate regression analysis revealed that lower BMD,the presence of IVF,cleft distribution of bone cement,and higher vertebral compression degree were all significantly associated with further height ***,the use of mineralized collagen modified-poly(methyl methacrylate)bone cement was associated with a significant reduction in the risk of further height *** multivariate regression analysis,lower BMD and the presence of IVF remained significantly associated with further height *** Further height loss following PVP in OVCF patients is influenced by a complex interplay of factors,especially lower BMD and the presence of *** findings underscore the importance of assessing and managing these factors when addressing height loss following PVP in OVCF patients.

关键词： Percutaneous vertebroplasty Osteoporotic vertebral compression fractures Further height loss Bone mineral density Intravertebral cleft

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平原河网地区稻田农药脉冲输出迟滞分析研究

中国环境科学 2024年第6期44卷 3408-3418页

作者：陈诚贾忠华罗纨刘文龙上海市环境科学研究院国家环境保护新型污染物环境健康影响评价重点实验室上海200233 扬州大学水利科学与工程学院江苏扬州225009

针对目前有关稻田施药后短期内农药的脉冲式输出过程及运移机理尚不十分明确的问题,以扬州市江都区农田水利科学研究站的试验稻田为研究区,针对稻田施药后农药面源污染物与排水的双脉冲输出过程开展高频监测,捕捉到毒死蜱、阿维菌素、... 详细信息

针对目前有关稻田施药后短期内农药的脉冲式输出过程及运移机理尚不十分明确的问题,以扬州市江都区农田水利科学研究站的试验稻田为研究区,针对稻田施药后农药面源污染物与排水的双脉冲输出过程开展高频监测,捕捉到毒死蜱、阿维菌素、三环唑和噻呋酰胺等4种水稻常用农药的脉冲式输出过程,结果显示:上述4种农药的输出浓度和负荷率峰值均发生在施药后2.5~5h内,输出脉冲特征明显.农药和排水双脉冲的相位关系受人为因素影响较大,呈现一定的随机性.对于淋溶性较好、受田间水文状况影响较大的农药(以杀菌剂三环唑和噻呋酰胺为代表),其迟滞指数分别为0.419和0.326,首次观察到较为明显的c-Q迟滞现象,该现象的发生与稻田施药先后顺序以及农药施入稻田后随水流运移到农沟水体的路径长短有关;而对挥发性较大的农药(以杀虫剂毒死蜱为代表),其迟滞系数仅为0.083,由于易受风向等不确定性因素影响未能观察到明显的迟滞现象.上述3种农药的FI值均等于或接近于1,说明排水脉冲对农药以富集作用为主.

关键词：稻田农药面源污染脉冲相位关系迟滞分析

法国教育数字化转型的历史沿革、现实经验与未来取向

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外国教育研究 2024年第3期51卷 46-62页

作者：罗江华钟文俊西南大学西南民族教育与心理研究中心重庆400715

过去二十年来,法国教育数字化经历了初步探索、强力推进到催化转型的历程。成功地打破了“抵抗变革”“技术与教育组织适配”等结构性限制,有效拉动了各类教育组织的数字化转型进程。其经验表现为:着力于形成共识;推进技术与教育深度融... 详细信息

过去二十年来,法国教育数字化经历了初步探索、强力推进到催化转型的历程。成功地打破了“抵抗变革”“技术与教育组织适配”等结构性限制,有效拉动了各类教育组织的数字化转型进程。其经验表现为:着力于形成共识;推进技术与教育深度融合;大力培养合格的数字居民;以数字化促进教育包容性。但也存在多元主体利益博弈、学生数字素养水准参差不齐以及数字教育作为公共服务的均衡性障碍等难题。为根除这些难题,法国把工作重心指向了数字教育生态系统,强调同构共享理念,围绕适应性主题来推进教学资源服务,进而打造极具整体性和包容性的数字教育生态。

关键词：法国教育数字化教育数字化转型数字教育生态共享

城市电商化发展、就业结构调整与消费升级--基于国家电子商务示范城市的准自然实验

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山西财经大学学报 2024年第6期46卷 83-97页

作者：罗琼钟坚唐红涛深圳大学经济学院广东深圳518060 湖南工商大学经济与贸易学院湖南长沙410205

基于“国家电子商务示范城市”这一准自然实验,运用2007—2021年城市面板数据,构建多时点DID模型探究城市电商化发展、就业结构与消费升级之间的关联。研究发现:城市电商化发展显著促进消费升级,此结论在一系列稳健性检验下依然成立。... 详细信息

基于“国家电子商务示范城市”这一准自然实验,运用2007—2021年城市面板数据,构建多时点DID模型探究城市电商化发展、就业结构与消费升级之间的关联。研究发现:城市电商化发展显著促进消费升级,此结论在一系列稳健性检验下依然成立。机制检验表明,城市电商化发展可通过提升就业结构有效赋能消费升级,主要表现为就业创造效应和就业替代效应两条路径。进一步研究其空间效应发现,国家电子商务示范城市建设发挥了显著示范效应,城市电商化发展不仅能推动本地消费升级,对其他地区的就业结构和消费升级均存在空间扩散效应。

关键词：国家电子商务示范城市就业创造就业替代消费升级空间扩散

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氮掺杂的碳基吸附剂高效分离甲烷/氮气

化学研究与应用 2024年第6期36卷 1367-1375页

作者：王涛敬方梨罗仕忠四川大学化学工程学院四川成都610065

采用变压吸附(PSA)高效分离甲烷和氮气是实现甲烷富集和回收的重要手段之一,其核心是高性能吸附剂的制备。本研究以三聚氰胺(M)为氮源,采用水热法合成了五种不同三聚氰胺和间苯二酚(R)质量比的间苯二酚树脂基吸附材料MRF-AC_(n)。运用... 详细信息

采用变压吸附(PSA)高效分离甲烷和氮气是实现甲烷富集和回收的重要手段之一,其核心是高性能吸附剂的制备。本研究以三聚氰胺(M)为氮源,采用水热法合成了五种不同三聚氰胺和间苯二酚(R)质量比的间苯二酚树脂基吸附材料MRF-AC_(n)。运用容量法测试303K,0~0.7MPa下甲烷和氮气的吸附性能,低温(77 K)氮吸脱附法对材料的孔结构进行表征,分别用Langmuir Freundlich(LF)模型和准二阶动力学(PSO)模型拟合甲烷和氮气的吸附等温线数据和动力学数据。结果表明,氮元素的引入调节了吸附材料的孔结构,不同程度增加了吸附材料的比表面积和微孔孔容,增加了吸附材料的极性,从而改变了甲烷和氮气的吸附量,其中样品MRF-AC_(2)表现出更好的甲烷和氮气吸附和分离性能,吸附量分别为45.20和22.23mL·g^(-1)分离比最高达到10以上。

关键词：变压吸附三聚氰胺吸附性能分离比

Surgical intervention combined with weight-bearing walking training promotes recovery in patients with chronic spinal cord injury:a randomized controlled study

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Neural Regeneration Research 2024年第12期19卷 2773-2784页

作者： Hui Zhu James D.Guest Sarah Dunlop Jia-Xin Xie Sujuan Gao Zhuojing luo Joe E.Springer Wutian Wu Wise Young Wai sang Poon Song Liu Hongkun Gao Tao Yu Dianchun Wang Libing Zhou Shengping Wu Lei zhong Fang Niu Xiaomei Wang Yansheng Liu Kwok-Fai So Xiao-Ming Xu Kunming Tongren Hospital KunmingYunnan ProvinceChina Neurological Surgery and the Miami Project to Cure ParalysisMiller School of MedicineUniversity of MiamiMiamiFLUSA School of Biological Sciences The University of Western AustraliaPerthWAAustralia Minderoo Foundation PerthWAAustralia Clinical Center for Spinal Cord Injury Kunming General Hospital of Chengdu Military CommandKunmingYunnan ProvinceChina Department of Biostatistics and Health Data Science Indiana University School of MedicineIndianapolisINUSA Department of Orthopedic Spinal Surgery Xijing HospitalFourth Military Medical UniversityXi’anShaanxi ProvinceChina Spinal Cord and Brain Injury Research Center Department of Physical Medicine and RehabilitationUniversity of Kentucky College of MedicineLexingtonKYUSA Guangdong-HongKong-Macao Institute of CNS Regeneration Jinan UniversityGuangzhouGuangdong ProvinceChina W.M.Keck Center for Collaborative Neuroscience Rutgers UniversityPiscatawayNJUSA Neurosurgery Department Chinese University of Hong KongPrince of Wales HospitalHong Kong Special Administration RegionChina Spinal Cord and Brain Injury Research Group Stark Neurosciences Research InstituteDepartment of Neurological SurgeryIndiana University School of MedicineIndianapolisINUSA

For patients with chronic spinal cord injury,the co nventional treatment is rehabilitation and treatment of spinal cord injury complications such as urinary tract infection,pressure sores,osteoporosis,and deep vein *** is rarely perfo rmed on spinal co rd injury in the chronic phase,and few treatments have been proven effective in chronic spinal cord injury *** of effective therapies fo r chronic spinal co rd injury patients is *** conducted a randomized controlled clinical trial in patients with chronic complete thoracic spinal co rd injury to compare intensive rehabilitation(weight-bearing walking training)alone with surgical intervention plus intensive *** clinical trial was registered at ***(NCT02663310).The goal of surgical intervention was spinal cord detethering,restoration of cerebrospinal fluid flow,and elimination of residual spinal cord *** found that surgical intervention plus weight-bearing walking training was associated with a higher incidence of American Spinal Injury Association Impairment Scale improvement,reduced spasticity,and more rapid bowel and bladder functional recovery than weight-bearing walking training ***,the surgical procedures and intensive rehabilitation were *** Spinal Injury Association Impairment Scale improvement was more common in T7-T11 injuries than in T2-T6 *** combined with rehabilitation appears to have a role in treatment of chronic spinal cord injury patients.

关键词： chronic spinal cord injury intensive rehabilitation locomotor training neurological recovery surgical intervention weightbearing walking training

住房产权对城镇居民家庭经济地位变动的异质性影响

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财经理论与实践 2024年第3期45卷 139-145页

作者：罗曼怡钟世虎刘友金湖南科技大学商学院湖南湘潭411201 湖南工商大学经济与贸易学院湖南长沙410205 上海国家会计学院上海201702 上海交通大学安泰经济与管理学院上海200030

依据2010年、2012年、2014年、2016年和2018年的中国家庭追踪调查数据,考量住房产权对居民家庭经济地位变动的异质性影响。结果显示:由于完全住房产权获得的房奴效应超过其财富效应,存在贷款偿还压力的家庭为了保证月供还款,不敢冒险追... 详细信息

依据2010年、2012年、2014年、2016年和2018年的中国家庭追踪调查数据,考量住房产权对居民家庭经济地位变动的异质性影响。结果显示:由于完全住房产权获得的房奴效应超过其财富效应,存在贷款偿还压力的家庭为了保证月供还款,不敢冒险追求具有更好工作前景和高工资的职位或创业机会。完全住房产权获得对居民家庭经济地位提升有负向影响,部分产权获得对居民家庭经济地位变动的影响不显著,住房产权获得对老年群体、低学历群体家庭经济地位提升负向影响显著,对青年群体、高学历群体的家庭经济地位变动的影响不显著。

关键词：住房产权财富效应房奴效应家庭经济地位变动