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Development of a Three-Dimensional Multiscale Octree SBFEM for Viscoelastic Problems of Heterogeneous Materials

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Computer Modeling in Engineering & Sciences 2024年第8期140卷 1831-1861页

作者： xu xu Xiaoteng Wang Haitian Yang Zhenjun Yang Yiqian He State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDepartment of Engineering MechanicsDalian University of TechnologyDalian116024China Hubei Key Laboratory of Geotechnical and Structural Safety School of Civil EngineeringWuhan UniversityWuhan430072China Mechanik–Materialtheorie Ruhr-Universität BochumBochum44801Germany

The multiscale method provides an effective approach for the numerical analysis of heterogeneous viscoelastic materials by reducing the degree of freedoms(DOFs).A basic framework of the Multiscale Scaled Boundary Finite Element Method(MsSBFEM)was presented in our previous works,but those works only addressed two-dimensional *** order to solve more realistic problems,a three-dimensional MsSBFEM is further developed in this *** the proposed method,the octree SBFEM is used to deal with the three-dimensional calculation for numerical base functions to bridge small and large scales,the three-dimensional image-based analysis can be conveniently conducted in small-scale and coarse nodes can be flexibly adjusted to improve the computational ***,the Temporally Piecewise Adaptive Algorithm(TPAA)is used to maintain the computational accuracy of multiscale analysis by adaptive calculation in time *** results of numerical examples show that the proposed method can significantly reduce the DOFs for three-dimensional viscoelastic analysis with good *** instance,the DOFs can be reduced by 9021 times compared with Direct Numerical Simulation(DNS)with an average error of 1.87%in the third example,and it is very effective in dealing with three-dimensional complex microstructures directly based on images without any geometric modelling process.

关键词： Three-dimensionalmultiscale viscoelastic analysis numerical base functions octree SBFEM image-based analysis temporally piecewise adaptive algorithm

Twisted Integration of Complex Oxide Magnetoelectric Heterostructures via Water‑Etching and Transfer Process

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Nano-Micro Letters 2024年第1期16卷 360-369页

作者： Guannan Yang Guohua Dong Butong Zhang xu xu Yanan Zhao Zhongqiang Hu Ming Liu State Key Laboratory for Manufacturing Systems Engineering Electronic Materials Research LaboratoryKey Laboratory of the Ministry of EducationEngineering Research Center of Spin Quantum Sensor ChipsUniversities of Shaanxi ProvinceSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an 710049People’s Republic of China

Manipulating strain mode and degree that can be applied to epitaxial complex oxide thin films have been a cornerstone of strain *** recent years,lift-off and transfer technology of the epitaxial oxide thin films have been developed that enabled the integration of heterostructures without the limitation of material types and crystal ***,twisted integration would provide a more interesting strategy in artificial magnetoelectric heterostructures.A specific twist angle between the ferroelectric and ferromagnetic oxide layers corresponds to the distinct strain regulation modes in the magnetoelectric coupling process,which could provide some insight in to the physical *** this work,the La_(0.67)Sr_(0.33)MnO_(3)(001)/0.7Pb(Mg_(1/3)Nb_(2/3))O_(3)-0.3PbTiO_(3)(011)(LSMO/PMN-PT)heterostructures with *** *** angles were assembled via water-etching and transfer *** transferred LSMO films exhibit a fourfold magnetic anisotropy with easy axis along LSMO.A coexistence of uniaxial and fourfold magnetic anisotropy with LSMO[110]easy axis is observed for the 45°Sample by applying a 7.2 kV cm^(−1)electrical field,significantly different from a uniaxial anisotropy with LSMO[100]easy axis for the 0°*** fitting of the ferromagnetic resonance field reveals that the strain coupling generated by the 45°twist angle causes different lattice distortion of LSMO,thereby enhancing both the fourfold and uniaxial *** work confirms the twisting degrees of freedom for magnetoelectric coupling and opens opportunities for fabricating artificial magnetoelectric heterostructures.

关键词： Magnetoelectric heterostructures Twist angle Epitaxial lift-off Magnetic anisotropy Ferromagnetic resonance

Prognostic analysis of related factors of adverse reactions to immunotherapy in advanced gastric cancer and establishment of a nomogram model

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World Journal of Gastrointestinal Oncology 2024年第4期16卷 1268-1280页

作者： xu-xu He Bang Du Tao Wu Hao Shen Department of Surgery Fudan University Affiliated Zhongshan Hospital(Qingpu Branch)Shanghai 201700China Department of Surgery Anhui Provincial Red Cross Society HospitalHefei 230031Anhui ProvinceChina Department of General Surgery West China Hospital of Sichuan UniversityChengdu 610044Sichuan ProvinceChina

BACKGROUND Immunotherapy for advanced gastric cancer has attracted widespread attention in recent ***,the adverse reactions of immunotherapy and its relationship with patient prognosis still need further *** order to determine the association between adverse reaction factors and prognosis,the aim of this study was to conduct a systematic prognostic *** comprehensively evaluating the clinical data of patients with advanced gastric cancer treated by immunotherapy,a nomogram model will be established to predict the survival status of patients more *** To explore the characteristics and predictors of immune-related adverse reactions(irAEs)in advanced gastric cancer patients receiving immunotherapy with programmed death protein-1(PD-1)inhibitors and to analyze the correlation between irAEs and patient *** A total of 140 patients with advanced gastric cancer who were treated with PD-1 inhibitors in our hospital from June 2021 to October 2023 were *** were divided into the irAEs group and the non-irAEs group according to whether or not irAEs *** features,manifestations,and prognosis of irAEs in the two groups were collected and analyzed.A multivariate logistic regression model was used to analyze the related factors affecting the occurrence of irAEs,and the prediction model of irAEs was *** receiver operating characteristic(ROC)curve was used to evaluate the ability of different indicators to predict irAEs.A Kaplan-Meier survival curve was used to analyze the correlation between irAEs and *** Cox proportional risk model was used to analyze the related factors affecting the prognosis of *** A total of 132 patients were followed up,of whom 63(47.7%)developed *** looked at the two groups’clinical features and found that the two groups were statistically different in age≥65 years,Ki-67 index,white blood cell count,neutrophil count,and regulatory T cell(Treg)count

关键词： Advanced gastric cancer Prognostic analysis Immunotherapy Nomogram model

Analysis of risk factors of suicidal ideation in adolescent patients with depression and construction of prediction model

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World Journal of Psychiatry 2024年第3期14卷 388-397页

作者： Jun-Chao Zhou Yan Cao xu-Yuan xu Zhen-Ping Xian Department of Psychosomatic Medicine The Affiliated Lianyungang Hospital of Xuzhou Medical UniversityThe First People's Hospital of LianyungangLianyungang 222000Jiangsu ProvinceChina

BACKGROUND Major depressive disorder is a common mental illness among adolescents and is the largest disease burden in this age *** adolescent patients with depression have suicidal ideation(SI);however,few studies have focused on the factors related to SI,and effective predictive models are *** To construct a risk prediction model for SI in adolescent depression and provide a reference assessment tool for *** The data of 150 adolescent patients with depression at the First People's Hospital of Lianyungang from June 2020 to December 2022 were retrospectively *** on whether or not they had SI,they were divided into a SI group(n=91)and a non-SI group(n=59).The general data and laboratory indices of the two groups were *** regression was used to analyze the factors influencing SI in adolescent patients with depression,a nomogram prediction model was constructed based on the analysis results,and internal evaluation was *** operating characteristic and calibration curves were used to evaluate the model’s efficacy,and the clinical application value was evaluated using decision curve analysis(DCA).RESULTS There were differences in trauma history,triggers,serum ferritin levels(SF),highsensitivity C-reactive protein levels(hs-CRP),and high-density lipoprotein(HDLC)levels between the two groups(P<0.05).Logistic regression analysis showed that trauma history,predisposing factors,SF,hs-CRP,and HDL-C were factors influencing SI in adolescent patients with *** area under the curve of the nomogram prediction model was 0.831(95%CI:0.763–0.899),sensitivity was 0.912,and specificity was *** higher net benefit of the DCA and the average absolute error of the calibration curve were 0.043,indicating that the model had a good *** The nomogram prediction model based on trauma history,triggers,ferritin,serum hs-CRP,and HDL-C levels can effectively predict the risk of SI in adolescent patients

关键词： Adolescents Depression Suicidal ideation Risk factors Prediction model Ferritin

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碳氢燃料超燃冲压发动机热非平衡效应

航空学报 2024年第11期45卷 259-271页

作者：吴忧陈兵杨庆春徐旭北京航空航天大学宇航学院北京102206

高超声速流动往往伴随着热化学非平衡效应,而热化学非平衡效应会对高超声速推进系统内的流动、燃烧带来一系列影响。采用双温度热化学非平衡模型以及热力学平衡模型,对飞行条件为马赫数10、高度29 km的煤油燃料超燃冲压发动机进行数值模... 详细信息

高超声速流动往往伴随着热化学非平衡效应,而热化学非平衡效应会对高超声速推进系统内的流动、燃烧带来一系列影响。采用双温度热化学非平衡模型以及热力学平衡模型,对飞行条件为马赫数10、高度29 km的煤油燃料超燃冲压发动机进行数值模拟,研究了热非平衡效应对发动机流动、燃烧及性能的影响。结果表明:热非平衡效应可以通过改变斜激波角度进而影响发动机内的流场结构和掺混效率。尽管热非平衡态下燃烧室前部的平衡温度较高,可以促进凹腔上游的燃烧,但对于凹腔后部的燃烧,热非平衡效应降低了热释放率峰值及燃烧效率。喷管中的振动非平衡效应可影响推力。总的来说,热非平衡效应降低了马赫数10煤油燃料发动机的性能。

关键词：高超声速流动热化学非平衡双温度模型超燃冲压发动机碳氢燃料

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基于模型迁移学习的木材导热系数预测

工程热物理学报 2024年第3期45卷 865-872页

作者：冯彦皓俞自涛陆江徐旭浙江大学热工与动力系统研究所杭州310027 能源高效清洁利用全国重点实验室(浙江大学) 杭州310027 浙江科技学院建筑工程学院杭州310023 中国计量大学计量测试工程学院杭州310018

木材导热系数对木结构建筑能耗精准预测具有重要意义,然而目前文献中的模型难以提供全面而准确的预测工具,且一些机器学习模型所考虑的因素和样本数有限。本文构建1941年至今含多种特征的导热系数数据库,并开发对比神经网络和迁移学习... 详细信息

木材导热系数对木结构建筑能耗精准预测具有重要意义,然而目前文献中的模型难以提供全面而准确的预测工具,且一些机器学习模型所考虑的因素和样本数有限。本文构建1941年至今含多种特征的导热系数数据库,并开发对比神经网络和迁移学习模型的预测精度。结果表明,结合迁移学习后,导热系数预测精度可提升23%以上,且迁移学习性能在0~0.3 W·m^(-1)·K^(-1)上精度提升明显,更适合于木结构等传热应用中。本文通过创新的模型参数微调迁移策略能为小样本、含大量缺失值的数据集和简单网络结构的导热系数预测提供思路。

关键词：木材导热系数迁移学习神经网络

政府参与危险品物流安全协同保障系统演化博弈研究

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系统科学学报 2024年第1期32卷 97-103页

作者：张广胜徐旭山东管理学院工商学院山东济南250357 上海电机学院商学院上海201306

为研究政府参与危险品物流安全协同保障系统影响因素及内在机理,采用演化博弈理论分别构建政府企业、危险品委托企业与物流企业之间多方演化博弈模型,探讨安全协同系统构建参与主体均衡策略选择,分析政府参与危险品物流安全协同保障系... 详细信息

为研究政府参与危险品物流安全协同保障系统影响因素及内在机理,采用演化博弈理论分别构建政府企业、危险品委托企业与物流企业之间多方演化博弈模型,探讨安全协同系统构建参与主体均衡策略选择,分析政府参与危险品物流安全协同保障系统演化博弈稳定性。研究结果表明,政府对企业的策略选择是影响决策的重要因素,政府积极推进策略建立起良好的政企互动机制,有利于危险品物流安全协同保障系统的合作演化;危险品委托企业与物流企业协同保障策略选择、投入成本对系统演化具有重要影响,较低安全成本促使双方期望收益高于不进行安全投入期望收益,因此有效降低物流安全协同保障系统构建投入成本是促使两者进行安全投入的关键。

关键词：危险品物流安全政府协同保障演化博弈均衡策略

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Efficacy of budesonide/formoterol inhalation powder in treating viral pneumonia in children

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World Journal of Clinical Cases 2024年第21期12卷 4469-4475页

作者： Zi-Liang Lin xu xu Jiao-Jiao Yang Li-Qiang Lu Heng Huang Xiao-Zhen Hua Li-Dang Lu Department of Pediatrics Cangnan Hospital Affiliated to Wenzhou Medical UniversityWenzhou 325800Zhejiang ProvinceChina

BACKGROUND Respiratory viruses are increasingly detected in children with communityacquired *** strategies to limit antibiotic use in children with viral pneumonia are *** To explore clinical efficacy of budesonide/formoterol inhalation powder for viral pneumonia in children and its impact on cellular immunity and inflammatory factor *** A total of 60 children with viral pneumonia were recruited:30 receiving budesonide/formoterol inhalation powder and 30 conventional symptomatic *** measures included peripheral blood levels of inflammatory cytokines,CD4^(+),CD8^(+),Th1,Th2,Th17 and Treg,clinical efficacy,and incidence of adverse *** Compared with the control group,the observation group showed a significant reduction in interleukin-6 and high-sensitivity C-reactive protein levels after *** with the control group,the observation group showed a significant increase in CD4^(+)/CD8^(+)and Th1/Th2 levels,and a decrease in Th17/Treg levels after *** total effective rates in the observation group and the control group were 93.75%and 85.00%,respectively,which was a significant difference(P=0.003).CONCLUSION Budesonide/formoterol inhalation powder significantly improved therapeutic efficacy for viral pneumonia in *** mechanism of action may be related to downregulation of the inflammatory response and improved cellular immune function.

关键词： Budesonide/Formoterol inhalation powder Viral pneumonia Immunity CD4^(+)/CD8^(+) Th1/Th2 Th17/Treg

社区团购农产品供应链的风险识别与风险网络结构分析——以淘菜菜为例

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中国流通经济 2024年第3期38卷 56-66页

作者：徐旭初杨威杭州电子科技大学法学院浙江杭州310018 杭州电子科技大学管理学院浙江杭州310018 浙江大学中国农村发展研究院浙江杭州310058

社区团购农产品供应链风险网络复杂,增加了风险防范的难度。准确识别风险因素,厘清风险外溢路径,对建立与完善社区团购农产品供应链风险管理体系和维持行业健康发展具有重要意义。以电商平台淘菜菜为案例,使用扎根理论及社会网络分析等... 详细信息

社区团购农产品供应链风险网络复杂,增加了风险防范的难度。准确识别风险因素,厘清风险外溢路径,对建立与完善社区团购农产品供应链风险管理体系和维持行业健康发展具有重要意义。以电商平台淘菜菜为案例,使用扎根理论及社会网络分析等方法,探究社区团购农产品供应链的风险,构建风险网络,评估风险关联程度,找出风险外溢路径。研究发现:在社区团购农产品供应链的风险网络中,物流方的履约交付、物流方的运输损耗、物流方的节点周转、平台的人员服务、平台的供应链计划、平台的采购交付是关键风险节点,有较强的风险影响能力。风险网络可根据风险节点间的关联程度划分为四个板块,四个板块间存在“溢出—影响—再溢出”的风险外溢路径。当某一风险节点出现问题时,与其隶属同一利益相关者或同一风险范畴的风险节点将会进一步放大风险外溢。鉴于此,找出社区团购农产品供应链的关键风险和外溢路径,有针对性地加强风险管理,强化路径监控,降低关键风险的影响,增强供应链的抗风险能力,可促进社区团购电商平台的可持续发展。

关键词：社区团购农产品供应链风险扎根理论社会网络分析 QAP回归

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