检索结果-南通市图书馆

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

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

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Targeted metabolomics reveals the aberrant energy status in diabetic peripheral neuropathy and the neuroprotective mechanism of traditional Chinese medicine JinMaiTong

引用

Journal of Pharmaceutical Analysis 2024年第2期14卷 225-243页

作者： Bingjia Zhao Qian Zhang yiqian he Weifang Cao Wei Song Xiaochun Liang Department of Traditional Chinese Medicine Peking Union Medical College HospitalPeking Union Medical CollegeChinese Academy of Medical SciencesBeijing100730China Institute of Basic Medicine Sciences Chinese Academy of Medical SciencesBeijing100005China Medical Research Center Peking Union Medical College HospitalPeking Union Medical CollegeChinese Academy of Medical SciencesBeijing100730China

Diabetic peripheral neuropathy (DPN) is a common and devastating complication of diabetes, for which effective therapies are currently lacking. Disturbed energy status plays a crucial role in DPN pathogenesis. However, the integrated profile of energy metabolism, especially the central carbohydrate metabolism, remains unclear in DPN. here, we developed a metabolomics approach by targeting 56 metabolites using high-performance ion chromatography-tandem mass spectrometry (HPIC-MS/MS) to illustrate the integrative characteristics of central carbohydrate metabolism in patients with DPN and streptozotocin-induced DPN rats. Furthermore, JinMaiTong (JMT), a traditional Chinese medicine (TCM) formula, was found to be effective for DPN, improving the peripheral neurological function and alleviating the neuropathology of DPN rats even after demyelination and axonal degeneration. JMT ameliorated DPN by regulating the aberrant energy balance and mitochondrial functions, including excessive glycolysis restoration, tricarboxylic acid cycle improvement, and increased adenosine triphosphate (ATP) generation. Bioenergetic profile was aberrant in cultured rat Schwann cells under high-glucose conditions, which was remarkably corrected by JMT treatment. In-vivo and in-vitro studies revealed that these effects of JMT were mainly attributed to the activation of adenosine monophosphate (AMP)-activated protein kinase (AMPK) and downstream peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α). Our results expand the therapeutic framework for DPN and suggest the integrative modulation of energy metabolism using TCMs, such as JMT, as an effective strategy for its treatment.

关键词： Diabetic peripheral neuropathy JinMaiTong Energy metabolism Targeted metabolomics Adenosine monophosphate-activated protein kinase

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

有限空间空气稳定性下人员呼吸过程暴露风险分析

引用

湖南大学学报（自然科学版） 2024年第3期51卷 193-200页

作者：邓晓瑞龚光彩王瑞何怡倩石星贺习之湖南大学土木工程学院湖南长沙410082 清华大学建筑学院北京100084 湖南工商大学前沿交叉学院湖南长沙410205 中国核电工程有限公司北京100840

以人体呼吸微环境为研究对象,通过全尺寸双人实验与数值模拟方法对有限空间空气稳定性下人员在其呼吸过程中暴露风险进行分析.研究表明:在呼吸气流的初始释放阶段,个体暴露水平主要取决于呼吸活动.随着污染物距离污染源越远,有限空间空... 详细信息

以人体呼吸微环境为研究对象,通过全尺寸双人实验与数值模拟方法对有限空间空气稳定性下人员在其呼吸过程中暴露风险进行分析.研究表明:在呼吸气流的初始释放阶段,个体暴露水平主要取决于呼吸活动.随着污染物距离污染源越远,有限空间空气稳定性与通风方式对呼吸微环境中的人员暴露情况的影响越来越重要,且这种影响具有时间无关性.在稳定型中,由于周围分层空气的限制作用,呼出的污染物具有更强的保持其沿初始惯性力方向传播的能力,不易扩散;不稳定型易破坏污染物沿其初始惯性力方向传播的能力,加快污染物的扩散,可以减少室内人员对呼吸微环境中污染物的暴露情况.本研究在控制污染物传播,降低疾病传播风险,保证人体健康方面具有理论及实际意义.

关键词：有限空间空气稳定性呼吸微环境个体暴露风险气流组织计算流体动力学

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

骨转移瘤治疗中骨盆假体的生物力学数值分析

引用

计算机辅助工程 2024年第2期33卷 10-16页

作者：何宜谦钱程邱恩铎于申王玉名大连理工大学工程力学系工业装备结构分析优化与CAE软件全国重点实验室辽宁大连116024 辽宁省肿瘤医院骨与软组织肿瘤科沈阳116044

为研究骨盆骨肿瘤手术后骨盆假体的强度和稳定性,针对具体病例建立骨盆-假体结构系统的有限元模型,分别进行静力和动力问题计算。静力工况为双腿和单腿站立状态,动力工况为骨盆不同方向、不同高度跌落以及不同固定方式的跌落过程,通过... 详细信息

为研究骨盆骨肿瘤手术后骨盆假体的强度和稳定性,针对具体病例建立骨盆-假体结构系统的有限元模型,分别进行静力和动力问题计算。静力工况为双腿和单腿站立状态,动力工况为骨盆不同方向、不同高度跌落以及不同固定方式的跌落过程,通过数值模型分析骨盆-假体结构系统不同工况的受力和变形。计算结果显示:在3种站立姿态下,结构最大应力均小于骨骼假体材料的强度极限,患侧的应力更大;骨盆从5 m高处跌落造成的最大应力可能超过骨骼和假体材料的屈服强度;螺钉固定方式对应力分布影响也较大。

关键词：骨肿瘤骨盆-假体结构固定方式生物力学动力学站立模拟跌落模拟有限元

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

2013—2022年上海市闵行区莘庄镇肺结核流行病学特征分析

引用

中国初级卫生保健 2024年第1期38卷 84-86页

作者：张雪思赵静徐雨生贺义倩上海市闵行区莘庄社区卫生服务中心上海201199

目的:了解2013—2022年上海市闵行区莘庄镇肺结核流行病学特征,为肺结核病预防控制提供科学依据。方法:对2013—2022年莘庄镇登记管理的肺结核病例数据进行流行病学分析。结果:2013—2022年莘庄镇肺结核患者登记率总体呈下降趋势,平均... 详细信息

目的:了解2013—2022年上海市闵行区莘庄镇肺结核流行病学特征,为肺结核病预防控制提供科学依据。方法:对2013—2022年莘庄镇登记管理的肺结核病例数据进行流行病学分析。结果:2013—2022年莘庄镇肺结核患者登记率总体呈下降趋势,平均年登记率23.12/10万,户籍患者322例(46.20%),非户籍患者375例(53.80%)。肺结核患者发病高峰在9月,2月发病例数较少。男性和女性患者比例为1.66∶1。非户籍肺结核患者中18~64岁年龄组构成比最高(89.07%);户籍肺结核患者中18~64岁年龄组构成比也最高(63.98%)。不同片区肺结核病例分布差异有统计学意义(F=16.924,P<0.05)。结论:2013—2022年莘庄镇肺结核患者发病例数整体呈下降趋势,流动人口、男性人群是肺结核防控的重点人群。应依据莘庄镇片区的人口结构及人员分布结构,加大防控力度,有针对性地降低肺结核发病率。

关键词：肺结核流行特征流动人口

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Temporally Piecewise Adaptive Scaled Boundary Finite Element Method for Solving the Fuzzy Uncertain Viscoelastic Problems

引用

Acta Mechanica Solida Sinica 2018年第4期31卷 459-469页

作者： Qiwen Xue Jing Wang yiqian he Haitian Yang Xiuyun Du School of civil and safety engineering Dalian Jiaotong University Dalian 116028 China State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering Mechanics Dalian University of Technology DaIian 116024 China School of Physics and Electronic Technology Liaoning Normal University Dalian 116029 China

The numerical solutions for uncertain viscoelastic problems have important theo- retical and practical significance. The paper develops a new approach by combining the scaled boundary finite element method （SBFEM） and fuzzy arithmetic. For the viscoelastic problems with zero uncertainty, the SBFEM and the temporally piecewise adaptive algorithm is employed in the space domain and the time domain, respectively, in order to provide an accurate semi- analytical boundary-based approach and to ensure the accuracy of discretization in the time domain with different sizes of time step at the same time. The fuzzy arithmetic is used to address the uncertainty analysis of viscoelastic material parameters, and the transformation method is used for computation with the advantages of effectively avoiding overestimation and reducing the computational costs. Numerical examples are provided to test the performance of the proposed method. By comparing with the analytical solutions and the Monte Carlo method, satisfactory results are achieved.

关键词： Viscoelasticity Uncertainty Scaled boundary finite element Fuzzy arithmetic

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Variational Neural Inference Enhanced Text Semantic Communication System

引用

China Communications 2024年第7期21卷 50-64页

作者： Zhang Xi Zhang yiqian Li Congduan Ma Xiao School of Electronics and Communication Engineering Sun Yat-Sen UniversityShenzhen 518107China Guizhou University State Key Laboratory of Public Big Data Guiyang 550025China Shenzhen Key Laboratory of Navigation and Communication Integration Shenzhen 518107China School of Computer Science and Engineering Sun Yat-Sen UniversityGuangzhou 510006China

Recently,deep learning-based semantic communication has garnered widespread attention,with numerous systems designed for transmitting diverse data sources,including text,image,and speech,*** efforts have been directed toward improving system performance,many studies have concentrated on enhancing the structure of the encoder and ***,this often overlooks the resulting increase in model complexity,imposing additional storage and computational burdens on smart ***,existing work tends to prioritize explicit semantics,neglecting the potential of implicit *** paper aims to easily and effectively enhance the receiver's decoding capability without modifying the encoder and decoder *** propose a novel semantic communication system with variational neural inference for text ***,we introduce a simple but effective variational neural inferer at the receiver to infer the latent semantic information within the received *** information is then utilized to assist in the decoding *** simulation results show a significant enhancement in system performance and improved robustness.

关键词： deep learning semantic communication variational neural inference

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Distinguishing the observational signatures of hot spots orbiting Reissner-Nordström spacetime

引用

Chinese Physics C 2024年第7期48卷 221-230页

作者：吴天枢陈一千 Center for Theoretical Physics College of PhysicsSichuan UniversityChengdu 610064China

This paper investigates observable signatures of hot spots orbiting Reissner-Nordström(RN)black holes and naked *** an RN black hole,we find two discernible lensing image tracks in time integrated images,capturing a complete orbit of hot spots and a image shadow within the critical curve where photons with a small impact parameter fall into the event ***,in RN singularities,additional image tracks can be found within the critical curve,originating from photons reflected by the infinitely high effective potential ***,we find incomplete and converging tracks from the time integrated images of hot spot orbiting RN singularities that have no photon *** presence of these additional image tracks significantly influences temporal magnitudes at their local maxima,enabling us to differentiate between RN black holes and RN naked singularities.

关键词： astrometry gravitational lensing black hole physics D0I:10.1088/1674-1137/ad3c2d

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

老年股骨近端骨折的生物力学特性及临床应用

引用

中国骨质疏松杂志 2022年第7期28卷 1082-1086页

作者：柯嵩于利何宜谦大连医科大学附属第一医院骨科辽宁大连116000 唐山市第二医院骨科河北唐山063000 大连理工大学工程力学系/工业装备结构分析国家重点实验室辽宁大连116000

近年来,随着人口老龄化的加重,股骨近端骨折的发生率呈明显的上升趋势。随着生物力学软件在医学建模上的应用及发展,利用有限元建模软件对人体骨骼进行生物力学分析及试验,来重建骨的微观结构、分析骨的力学规律成为当前研究的热点。笔... 详细信息

近年来,随着人口老龄化的加重,股骨近端骨折的发生率呈明显的上升趋势。随着生物力学软件在医学建模上的应用及发展,利用有限元建模软件对人体骨骼进行生物力学分析及试验,来重建骨的微观结构、分析骨的力学规律成为当前研究的热点。笔者综述了股骨近端骨折的生物力学特性及近年来国内外股骨近端骨折生物力学研究取得的新进展,并结合新进展探讨了其中的一些不足和未来的发展方向,以期更为准确地预测老年股骨近端骨折的发生几率,为指导老年骨质疏松患者的个体化治疗、降低老年股骨近端骨折风险提供指导价值。

关键词：股骨近端骨折生物力学有限元分析骨质疏松

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Overcoming genotypic dependency and bypassing immature embryos in wheat transformation by using morphogenic regulators

引用

Science China(Life Sciences) 2024年第7期67卷 1535-1538页

作者： Ziru Zhou Yawen Yang Guo Ai Miaomiao Zhao Baozhu Han Chunjie Zhao yiqian Chen Yuwei Zhang Hong Pan Caixia Lan Chao he Qiang Li Jieting Xu Wenhao Yan National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhan 430070China WIMI Biotechnology Co. Ltd.Changzhou 213025China

Dear Editor,Agrobacterium-mediated transformation technology is of vital importance for functional genomics studies and precision breeding in crops due to low cost and clear genetic manifestation.A morphogenic gene pa... 详细信息

关键词： breeding crops transformation

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：