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Nonlinear Wavelet Methods for High-dimensional Backward Heat Equation

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Acta Mathematica Sinica,English Series 2013年第5期29卷 913-922页

作者： rui LI jin ru wang Department of Applied Mathematics Beijing University of Technology

The backward heat equation is a typical ill-posed problem. In this paper, we shall apply a dual least squares method connecting Shannon wavelet to the following equation Motivated by Reginska＇s work, we shall give two nonlinear approximate methods to regularize the approximate solutions for high-dimensional backward heat equation, and prove that our methods are convergent.

关键词： Backward heat equation nonlinear wavelet method convergence

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热传导方程小波解的点态收敛

数学学报（中文版） 2006年第4期49卷 809-818页

作者：王晋茹北京工业大学应用数理学院北京100022

本文主要考虑热传导方程uxx=ut,0≤x<1,t≥0;u(1,t)=g(t),其中边界条件g(t)为已知函数．此定解问题为一不适定问题,也就是说当边界条件有微小扰动时,将会引起解大的扰动．本文将利用多分辨率分析构造一小波解,且证明此解是适定的,并给... 详细信息

本文主要考虑热传导方程uxx=ut,0≤x<1,t≥0;u(1,t)=g(t),其中边界条件g(t)为已知函数．此定解问题为一不适定问题,也就是说当边界条件有微小扰动时,将会引起解大的扰动．本文将利用多分辨率分析构造一小波解,且证明此解是适定的,并给出所定义小波解与定解问题的真正解在点态意义下的误差估计．

关键词：多分辨率分析 Meyer小波小波解

带超级光滑噪声密度函数的小波自适应点态估计

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数学学报（中文版） 2019年第5期62卷 687-702页

作者：吴聪曾晓晨王晋茹北京工业大学应用数理学院

利用小波方法在局部Holder空间中研究一类反卷积密度函数的点态估计问题.首先,针对超级光滑噪声给出该模型任一估计器的点态风险下界;其次,构造有限求和小波估计器,并证明其在超级光滑噪声条件下达到了最优收敛阶,即该估计器在点态风险... 详细信息

利用小波方法在局部Holder空间中研究一类反卷积密度函数的点态估计问题.首先,针对超级光滑噪声给出该模型任一估计器的点态风险下界;其次,构造有限求和小波估计器,并证明其在超级光滑噪声条件下达到了最优收敛阶,即该估计器在点态风险下的收敛速度与下界一致.最后,还讨论了这类小波估计器的强收敛性.值得指出的是上述估计都是自适应的.

关键词：小波点态密度估计自适应最优性

Acquired sensorineural hearing loss,oxidative stress,and microRNAs

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Neural Regeneration Research 2025年第9期20卷 2513-2519页

作者： Desmond A.Nunez ru C.Guo Division of Otolaryngology–Head&Neck Surgery Department of SurgeryFaculty of MedicineThe University of British ColumbiaVancouverBCCanada Division of Otolaryngology–Head&Neck Surgery Gordon&Leslie Diamond Health Care CentreVancouver General HospitalVancouverBCCanada Faculty of Medicine–The University of British Columbia VancouverBCCanada

Hearing loss is the third leading cause of human ***-related hearing loss,one type of acquired sensorineural hearing loss,is largely responsible for this escalating global health ***-induced,ototoxic,and idiopathic sudden sensorineural are other less common types of acquired hearing *** etiology of these conditions is complex and multi-fa ctorial involving an interplay of genetic and environmental *** stress has recently been proposed as a likely linking cause in most types of acquired sensorineural hearing *** non-coding RNA sequences known as microRNAs(miRNAs)have increasingly been shown to play a role in cellular hypoxia and oxidative stress responses including promoting an apoptotic *** hair cell death is a central histopathological finding in sensorineural hearing *** these cells do not regenerate in humans,it underlies the irreversibility of human age-related hearing *** EMBASE,Ovid MEDLINE,Web of Science Core Collection,and *** databases over the period August 1,2018 to July 31,2023 were searched with"hearing loss,""hypoxamiRs,""hypoxia,""microRNAs,""ischemia,"and"oxidative stress"text words for English language primary study publications or registered clinical *** red clinical trials known to the senior author we re also assessed.A total of 222studies were thus *** excluding duplicates,editorials,retra ctions,secondary research studies,and non-English language articles,39 primary studies and clinical trials underwent full-text *** resulted in 11 animal,in vitro,and/or human subject journal articles and 8 registered clinical trial database entries which form the basis of this narrative *** miR-34a and miR-29b levels increase with age in *** miRNAs were demonstrated in human neuroblastoma and murine cochlear cell lines to target Sirtuin 1/peroxisome proliferato r-activated receptor gamma coactivator-1-alpha(SIRT1/P GC-1α),SIRT

关键词： hearing loss hypoxia microRNAs oxidative stress sensorineural

miRNA-21-5p is an important contributor to the promotion of injured peripheral nerve regeneration using hypoxia-pretreated bone marrow-derived neural crest cells

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Neural Regeneration Research 2025年第1期20卷 277-290页

作者： Meng Cong jing-jing Hu Yan Yu Xiao-Li Li Xiao-Ting Sun Li-Ting wang Xia Wu Ling-Jie Zhu Xiao-Jia Yang Qian-ru He Fei Ding Hai-Yan Shi School of Medicine Nantong UniversityNantongJiangsu ProvinceChina Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education and Coinnovation Center of Neuroregeneration Nantong UniversityNantongJiangsu ProvinceChina Department of Physiology Jiangsu Health Vocational CollegeNanjingJiangsu ProvinceChina Department of Pathology Affiliated Hospital of Nantong UniversityNantongJiangsu ProvinceChina Jiangsu Clinical Medicine Center of Tissue Engineering and Nerve Injury Repair Affiliated Hospital of Nantong UniversityNantongJiangsu ProvinceChina

Our previous study found that rat bone marrow–derived neural crest cells(acting as Schwann cell progenitors)have the potential to promote long-distance nerve ***-based therapy can enhance peripheral nerve repair and regeneration through paracrine bioactive factors and intercellular ***,the complex contributions of various types of soluble cytokines and extracellular vesicle cargos to the secretome remain *** investigate the role of the secretome and extracellular vesicles in repairing damaged peripheral nerves,we collected conditioned culture medium from hypoxia-pretreated neural crest cells,and found that it significantly promoted the repair of sensory neurons damaged by oxygen-glucose *** mRNA expression of trophic factors was highly expressed in hypoxia-pretreated neural crest *** performed RNA sequencing and bioinformatics analysis and found that miR-21-5p was enriched in hypoxia-pretreated extracellular vesicles of neural crest ***,to further clarify the role of hypoxia-pretreated neural crest cell extracellular vesicles rich in miR-21-5p in axonal growth and regeneration of sensory neurons,we used a microfluidic axonal dissociation model of sensory neurons in vitro,and found that hypoxia-pretreated neural crest cell extracellular vesicles promoted axonal growth and regeneration of sensory neurons,which was greatly dependent on loaded ***,we constructed a miR-21-5p-loaded neural conduit to repair the sciatic nerve defect in rats and found that the motor and sensory functions of injured rat hind limb,as well as muscle tissue morphology of the hind limbs,were obviously *** findings suggest that hypoxia-pretreated neural crest extracellular vesicles are natural nanoparticles rich in ***-21-5p is one of the main contributors to promoting nerve regeneration by the neural crest cell *** helps to explain the mechanism of action of the secretome and e

关键词： axotomy cell-free therapy conditioned medium extracellular vesicles hypoxic preconditioning microRNA oxygen-glucose deprivation peripheral nerve injury Schwann cell precursors

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碳氢燃油液滴蒸发的分析

内燃机工程 1985年第1期 10-18页

作者：金如山王庚侯木玉李汝辉北京航空学院北京航空学院

本文就环境压力和温度对燃油液滴蒸发速率的影响进行了分析研究。提出了一种计算稳态蒸发下液滴表面温度和蒸发常数的方法,并用这种方法确定了美国JP-4、DF-2和中国RP-2等燃油的蒸发特性。计算所得的蒸发常数值与已公布的相应的试验结... 详细信息

本文就环境压力和温度对燃油液滴蒸发速率的影响进行了分析研究。提出了一种计算稳态蒸发下液滴表面温度和蒸发常数的方法,并用这种方法确定了美国JP-4、DF-2和中国RP-2等燃油的蒸发特性。计算所得的蒸发常数值与已公布的相应的试验结果相符。

关键词：液滴蒸发湿球温度碳氢蒸发速率临界压力常数值压力指数油蒸气对流换热系数强迫对流

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北京市土地复合生态管理的评估体系研究

生态经济(学术版) 2007年第2期 341-344页

作者：欧金明王如松阳文锐黄锦楼刘晶茹吴琼中国科学院生态环境研究中心城市与区域生态国家重点实验室中国科学院生态环境研究中心城市与区域生态国家重点实验室北京100085

城市土地是一类社会—经济—自然复合生态系统,具有物理属性、生态属性、社会属性和经济属性,为城市提供生产、生活、流通、还原和调控等服务功能。然而以往的土地管理着重于土地结构、权属和用地性质的数量管理,而缺乏对土地功能、过... 详细信息

城市土地是一类社会—经济—自然复合生态系统,具有物理属性、生态属性、社会属性和经济属性,为城市提供生产、生活、流通、还原和调控等服务功能。然而以往的土地管理着重于土地结构、权属和用地性质的数量管理,而缺乏对土地功能、过程和生态资产的系统管理。土地复合生态管理从技术革新、体制改革和行为诱导入手,调节土地利用的结构、过程与功能,保证生命支持系统功能和居民身心健康得到最大限度的保护,土地的经济、生态和文化功能得以持续、健康的发展,促进资源的综合利用,环境的综合整治及人的综合发展。土地复合生态管理的评估体系将传统土地利用的一次性审批转换为连续的生态监测,及时掌握生态环境状况和变化趋势,定期对土地进行生态审计与评估,是促进土地合理使用的重要手段。土地复合生态管理要求针对土地这一复合生态系统建立一系列生态指标,并对这些指标进行适时监控,准确评估土地利用维持和变化产生的生态服务功能变化。

关键词：土地管理复合生态生态评估北京

Regulating the oxygen-atom configuration of carbon anode enabling extremely fast-charging potassium-ion hybrid capacitors

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Nano Research 2025年第1期18卷 373-381页

作者： Daping Qiu Yuehui wang Lulu Zhang Hang Lei Haizhou Ying jin Niu Min Li Xuelin Yang Feng wang ru Yang Hubei Provincial Collaborative Innovation Center for New Energy Microgrid College of Electrical Engineering and New EnergyChina Three Gorges UniversityYichang 443002China State Key Laboratory of Chemical Resource Engineering Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China College of Materials and Chemical Engineering China Three Gorges UniversityYichang 443002China

Metal-ion hybrid capacitors,such as potassium-ion hybrid capacitors(PIHCs),are regarded as promising fast-charging energy storage ***,the kinetics mismatch between the battery anode and the capacitive cathode restricts their fastcharging *** constructing carbon anodes with enhanced kinetics is an innovative approach to address this ***,using epigallocatechin gallate with high oxygen content as the precursor,oxygen-enriched carbon materials(OEC)with tunable C=O content are successfully ***,the C=O content of OEC is regulated by adjusting the pyrolysis *** as an anode for PIHCs,OEC-600 with the highest C=O content exhibits an attractive fast-charging specific capacity of 135.2 mAh·g^(-1)at 20 A·g^(-1),along with a superior fast-charging cycling *** theoretical calculations,comprehensive kinetics analysis and in-situ Raman,the positive effects of C=O on the potassium storage capability and reversibility of OEC-600 are ***,PIHCs assembled based on an OEC-600 anode deliver impressive energy/power density of 145.1 Wh·kg^(-1)/45.9 kW·kg^(-1)and superior fast-charging cycling stability with 87.5%of capacity retention over 20,000 cycles at 5 A·g^(-1).This work is anticipated to provide an optional design concept toward the carbon anode for fast-charging PIHCs.

关键词： carbon anode oxygen epigallocatechin gallate potassium-ion hybrid capacitor

南京市某校卫生类五年制高职学生健康素养现况调查与分析

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职业与健康 2016年第21期32卷 2984-2987页

作者：彭鹏闵捷乜金茹王晓康江苏联合职业技术学院南京卫生分院护理系江苏南京210000

目的了解南京市某校卫生类五年制高职学生健康素养现状,分析主要的影响因素,揭示学生健康素养相关知识的知晓情况,为有针对性地开展健康素养干预工作提供参考依据。方法采用分层整群抽样的方法,于2016年2、3月间在南京市某卫生类高职院... 详细信息

目的了解南京市某校卫生类五年制高职学生健康素养现状,分析主要的影响因素,揭示学生健康素养相关知识的知晓情况,为有针对性地开展健康素养干预工作提供参考依据。方法采用分层整群抽样的方法,于2016年2、3月间在南京市某卫生类高职院校抽取990人进行问卷调查并分析。结果 22.44%的学生具备健康素养,学生健康素养的总平均得分是(72.89±8.24)分,其中基本知识和理念的平均得分是(36.47±4.26)分,健康生活方式与行为的平均得分是(19.07±3.07)分,基本技能的平均得分是(17.34±3.04)分,3方面素养中健康生活方式与健康生活方式与行为合格率最低(因为每一维度总分不同,比较平均分不合适);各维度间存在着正相关关系;健康素养主要影响因素为性别、民族、年级、专业。结论卫生类五年制高职学校应在加强健康教育的基础上,注重学生行为的培养,改善健康教育模式与方法,改善学生的知识结构,并进行定期的监测与评价。

关键词：卫生类五年制高职健康素养影响因素现况调查