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SHARP POINTWISE-IN-TIME ERROR ESTIMATE OF L1 SCHEME FOR NONLINEAR SUBDIFFUSION EQUATIONS

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Journal of Computational Mathematics 2024年第3期42卷 662-678页

作者： dongfang Li Hongyu Qin Jiwei Zhang School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong University of Science and TechnologyWuhan 430074China School of Mathematics and Statistics Wuhan UniversityWuhan 430072China

An essential feature of the subdiffusion equations with theα-order time fractional derivative is the weak singularity at the initial *** weak regularity of the solution is usually characterized by a regularity parameterσ∈(0,1)∪(1,2).Under this general regularity assumption,we present a rigorous analysis for the truncation errors and develop a new tool to obtain the stability results,i.e.,a refined discrete fractional-type Grönwall inequality(DFGI).After that,we obtain the pointwise-in-time error estimate of the widely used L1 scheme for nonlinear subdiffusion *** present results fill the gap on some interesting convergence results of L1 scheme onσ∈(0,α)∪(α,1)∪(1,2].Numerical experiments are provided to demonstrate the effectiveness of our theoretical analysis.

关键词： Sharp pointwise-in-time error estimate Ll scheme Nonlinear subdiffusion equations Non-smooth solutions

Plasma Characteristic of Lightning Discharge Channel

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高电压技术 2013年第10期39卷 2452-2458页

作者： ZHANG Huaming YUAN Ping ZHANG Yijun WAN Jianjie OUYANG Yuhua wang dongfang Thunder Prevention and Observation Center of Shanxi Province Taiyuan 030002 China College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070 China Laboratory of Lightning Physics and Protection Engineering Chinese Academy of Meteorological Sciences Beijing 100081 China School of Mathematics and Physics Lanzhou Jiaotong University Lanzhou 730070 China Laboratory for Middle Atmosphere and Global Environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The plasma characteristics of a lightning discharge channel are *** spectrum of the natural lightning is investigated by employing the slit-less *** is found that the spectrum characteristics are closely related to the intensity of the lightning *** lines in the lightning spectrum are classified into essential lines and characteristic lines,according to the characteristics of lightning spectra with different *** characteristics of the lightning channel and the radiation of the lighting plasma are analyzed in the visible and infrared *** is shown that,the visible spectrum of lightning is determined by the radiation generated from the early stage to the development of lightning,while the near-infrared spectrum is determined by the radiation generated after current of lightning reaches the *** channel temperature and the electron density are calculated using the information obtained from the lightning *** the temperature and the density decrease with the increasing length of lightning ***,X-rays and neutrons are produced in the process of lighting mainly due to the pinch effects.

关键词：等离子体特性闪电光谱放电通道放电特性雷电放电辐射特性光谱特性电子密度

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基于迁移学习和残差网络的农作物病害分类

农业工程学报 2021年第4期37卷 199-207页

作者：王东方汪军安徽工程大学计算机与信息学院芜湖241000

作物病害对农业产品的质量和产量有重要影响,单一物种病害的分类模型难以应对复杂的农业生产环境。该研究对深度残差网络SE-ResNeXt-101模型进行改进,并基于迁移学习(TransferLearning,TL)提出了一种农作物病害分类模型TL-SE-ResNeXt-1... 详细信息

作物病害对农业产品的质量和产量有重要影响,单一物种病害的分类模型难以应对复杂的农业生产环境。该研究对深度残差网络SE-ResNeXt-101模型进行改进,并基于迁移学习(TransferLearning,TL)提出了一种农作物病害分类模型TL-SE-ResNeXt-101,用于不指定农作物种类的病害检测分类。在重构的AI Challenger 2018农作物病害数据集上,将该模型与VGG-16、GoogLeNet、ResNet-50和DenseNet-121卷积神经网络模型进行比较。结果表明,相同试验条件下,本文模型对不同作物种类的不同病害分类平均准确率达到98%,分类效果优于其他模型;在真实农业生产环境下该模型的分类效果也优于其他模型,平均准确率达到47.37%。该模型具有较高的识别准确率与较强的鲁棒性,可为复杂农业生产环境下对不同作物种类不同病害的识别分类提供参考。

关键词：作物病害深度学习残差网络迁移学习

OPA3 overexpression modulates lipid droplet production and sensitizes colorectal cancer cells to bevacizumab treatment

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BIOCELL 2024年第6期48卷 971-980页

作者： HONGBIAO WU dongfang LIU Department of Colorectal and Anal Surgery Ningbo First HospitalNingbo315010China

Background:Colorectal cancer(CRC)represents a substantial risk to public ***,theﬁrst US FDA-approved antiangiogenic drug(AAD)for human CRC treatment,faces resistance in *** role of lipid metabolism,particularly through OPA3-regulated lipid droplet production,in overcoming this resistance is under ***:The protein expression pattern of OPA3 in CRC primary/normal tissues was evaluated by bioinformatics ***3-overexpressed SW-480 and HCT-116 cell lines were established,and bevacizumab resistance and OPA3 effects on cell malignancy were ***3 protein/mRNA expression and lipid droplet-related genes were measured with Western blot and ***3 subcellular localization was detected using immunoﬂ*** and apoptosis were assessed via colony formation andﬂow *** formation assays were conducted to assess the angiogenic potential of human umbilical vein endothelial cells(HUVECs).Lipid analysis was used to measure the phosphatidylcholine(PC)and lysophosphatidylcholine(LPC)levels in CRC ***:Bioinformatics analysis revealed that OPA3 was downregulated in *** of OPA3 inhibited CRC cell proliferation,stimulated apoptosis,and suppressed the angiogenic ability of ***3 effectively reversed the resistance of CRC cells to bevacizumab and decreased lipid droplet production in CRC ***,OPA3 reversed the bevacizumab-induced lipid droplet production in CRC cells,thereby increasing CRC cell sensitivity to bevacizumab ***:This study suggests that OPA3 modulates lipid metabolism in CRC cells and reduces resistance to bevacizumab in CRC ***,OPA3 may be a potential therapeutic target against the AAD resistance in CRC.

关键词： Colorectal cancer OPA3 Bevacizumab Lipid droplet Antiangiogenic drug

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超声内镜和腹部超声诊断胆管结石的效能对比

内科 2024年第4期19卷 397-401页

作者：吴凤娟陈静赵亚楠刘娜张雅菲王东芳河南省郑州市第一人民医院消化内科郑州市450000

目的比较超声内镜和腹部超声诊断胆管结石的效能。方法回顾性分析30例疑似胆管结石患者的临床资料,所有患者均行超声内镜、腹部超声,以及经内镜逆行胰胆管造影/内镜下十二指肠乳头括约肌切开术。以经内镜逆行胰胆管造影/内镜下十二指肠... 详细信息

目的比较超声内镜和腹部超声诊断胆管结石的效能。方法回顾性分析30例疑似胆管结石患者的临床资料,所有患者均行超声内镜、腹部超声,以及经内镜逆行胰胆管造影/内镜下十二指肠乳头括约肌切开术。以经内镜逆行胰胆管造影/内镜下十二指肠乳头括约肌切开术诊断胆管结石为金标准,比较超声内镜、腹部超声诊断胆管结石的效能。结果超声内镜诊断胆管结石的准确度高于腹部超声法(P0.05)。与金标准相比,超声内镜、腹部超声诊断胆管结石的阳性结果差异均无统计学意义(均P>0.05)。超声内镜诊断不同部位(胆总管末端、胆总管以上、胆总管中下段)、不同大小(直径≤0.5 cm、0.5~1.0 cm、>1.0 cm)结石的结果与金标准均存在关联(均P0.05)。结论超声内镜对胆管结石的诊断效能高于腹部超声,对不同位置、大小的胆管结石的诊断结果均与金标准存在关联,对临床治疗有一定的指导价值。

关键词：胆管结石超声内镜腹部超声诊断

Ultrastable in-situ silver nanoparticle dressing for effective prevention and treatment of wound infection in emergency

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Engineered Regeneration 2024年第1期5卷 111-123页

作者： Wei wang Ziwei Hu Wanying Mo Min Ouyang Shihao Lin Xiang Li Chengxinqiao wang Feng Yu Yupeng wang dongfang Zhou Key Laboratory of Mental Health of the Ministry of Education NMPA Key Laboratory for Research and Evaluation of Drug Metabolism&Guangdong Provincial Key Laboratory of New Drug ScreeningSchool of Pharmaceutical SciencesSouthern Medical UniversityGuangzhou 510515China Institute of Otolaryngology Head and neck surgery Guangzhou Red Croee Hospital of Jinan UniversityGuangzhou 510282China c Department of Orthopaedics and Traumatology Zhujiang HospitalSouthern Medical UniversityGuangzhou 510282China

The use of antibacterial dressings is crucial in the prevention and treatment of wound infection in emergency ***,the efficacy of dressings is compromised by long-term storage or exposure to harsh ***,an ultrastable in-situ silver nanoparticle dressing(AgSNP@CD)was prepared for effective prevention and treatment of wound infection in *** fabrication process of AgSNP@CD is simple,suitable for large-scale *** to the strong interaction between the in-situ synthesized AgNPs and the cotton fabric,AgSNP@CD owned remarkable stability,thus retaining its antimicrobial efficacy even after long-term storage(up to 2 years)and under extreme conditions(damp heat,low temperatures,low-oxygen,water immersion,acid-alkali erosion).Both in vitro and in vivo results demonstrated the extraordinary antibacterial efficacy and stability of AgSNP@CD,facilitating infection prevention and wound healing in extreme *** particular,AgSNP@CD exhibited a superior treatment effect on severe bacteria-infected trauma and can prevent the occur-rence of sepsis *** exceptional stability and antibacterial efficacy of AgSNP@CD under complex and extreme conditions make it a well-suited dressing strategy for the prevention and treatment of wound infection in emergency.

关键词： Bacteria-infected wounds Silver nanoparticle dressing Ultra stability Infection prevention In emergency

Advances in the study of auxin early response genes:Aux/IAA,GH3,and SAUR

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The Crop Journal 2024年第4期12卷 964-978页

作者： dongfang Bao Senqiu Chang Xiaodong Li Yanhua Qi Key Laboratory of Herbage&Endemic Crop Biology of Ministry of Education Inner Mongolia Key Laboratory of Herbage&Endemic Crop BiotechnologySchool of Life SciencesInner Mongolia UniversityHohhot 010000Inner MongoliaChina

Auxin plays a crucial role in all aspects of plant growth and *** can induce the rapid and efficient expression of some genes,which are named auxin early response genes(AERGs),mainly including the three families:auxin/indole-3-acetic acid(Aux/IAA),Gretchen Hagen 3(GH3),and small auxin-up RNA(SAUR).Aux/IAA encodes the Aux/IAA protein,which is a negative regulator of auxin ***/IAA and auxin response factor(ARF)form a heterodimer and participate in a variety of physiological processes through classical or non-classical auxin signaling *** GH3 encodes auxin amide synthetase,which catalyzes the binding of auxin to acyl-containing small molecule substrates(such as amino acids and jasmonic acid),and regulates plant growth and stresses by regulating auxin *** is a class of small auxin up-regulated *** response to auxin is complex,and the process may occur at the transcriptional,post-transcriptional and protein *** the development of multi-omics,significant progress has been made in the study of Aux/IAA,GH3,and SAUR genes,but there are still many *** review offers insight into the characteristics of Aux/IAA,GH3,and SAUR gene families,and their roles in roots,hypocotyls,leaves,leaf inclinations,flowers,seed development,stress response,and phytohormone crosstalk,and provides clues for future research on phytohormone signaling and the molecular design breeding of crops.

关键词： Auxin Aux/IAA GH3 SAUR Stress

A FINITE DIFFERENCE METHOD FOR TWO DIMENSIONAL ELLIPTIC INTERFACE PROBLEMS WITH IMPERFECT CONTACT

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Journal of Computational Mathematics 2024年第5期42卷 1328-1355页

作者： Fujun Cao dongfang Yuan Dongxu Jia Guangwei Yuan School of Science Inner Mongolia University of Science and TechnologyBaotou 014010Inner MongoliaChina School of Science Tianjin University of TechnologyTianjin 300384China Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsP.O.Box 8009Beijing 100088China

In this paper two dimensional elliptic interface problem with imperfect contact is considered,which is featured by the implicit jump condition imposed on the imperfect contact interface,and the jumping quantity of the unknown is related to the flux across the interface.A finite difference method is constructed for the 2D elliptic interface problems with straight and curve interface ***,the stability and convergence analysis are given for the constructed ***,in particular case,it is proved to be *** examples for elliptic interface problems with straight and curve interface shapes are tested to verify the performance of the *** numerical results demonstrate that it obtains approximately second-order accuracy for elliptic interface equations with implicit jump condition.

关键词： Finite difference method Elliptic interface problem Imperfect contact

Retrofit of 350-MW Supercritical Boiler Based on the Analysis on Exhaust Gas Temperature

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Electricity 2011年第5期22卷 31-33页

作者： Qin Jiangzhu Huaneng dongfang Power Plant wang Shichang

Since the first batch of 350-MW supercritical utility boilers was put into operation, the exhaust flue gas temperature of the boilers has always been higher than the designed value. The main reason is that the heat absorbed by the air heater is not sufficient. In Huaneng dongfang Power Plant, the exhaust flue gas temperature is lowered through modifications to the economizer and the air heater. The experimental results reveal that every year, each boiler could save 3 850 tons of standard coal and reduce 85 tons of SO2 and 9 000 tons of CO2 respectively after retrofit.

关键词： 350-MW utility boiler supercritical exhaust flue gas temperature air heater retrofit