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一种抗畸变的增强型八节点等参元

中山大学学报（自然科学版）（中英文） 2024年第3期63卷 163-171页

作者：乔海青鲍四元沈峰苏州科技大学土木工程学院江苏苏州215011

为了提高平面问题的求解精度,基于勒让德正交函数族引入泡状函数来增强映射关系的思想,构造Q8_Legendre单元。针对单元的位移场中含有泡状函数导致单元刚度矩阵规模变大的问题,在得到单元刚度矩阵后附加自由度凝聚,以减小整体刚度矩阵... 详细信息

为了提高平面问题的求解精度,基于勒让德正交函数族引入泡状函数来增强映射关系的思想,构造Q8_Legendre单元。针对单元的位移场中含有泡状函数导致单元刚度矩阵规模变大的问题,在得到单元刚度矩阵后附加自由度凝聚,以减小整体刚度矩阵规模、节省计算机内存空间。算例表明,随着泡状函数项数的不断增加,Q8_Legendre单元能够通过分片试验,使得单元的位移精度得到改善,而应力精度保持相当。当出现畸变网格时,Q8_Legendre单元表现出抗畸变的性能,且不会出现闭锁现象。

关键词：平面问题泡状函数位移修正模型高斯积分抗畸变

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变截面曲梁面外自由振动的一种新型级数分析法

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噪声与振动控制 2024年第5期44卷 27-32,81页

作者：袁啸鲍四元苏州科技大学土木工程学院江苏苏州215011

给出曲梁面外自由振动问题的一种数值分析模型,该模型基于改进傅里叶级数法假设位移,并使用瑞利-里兹方法进行求解。首先,应用改进傅里叶级数法表示曲梁面外弯扭振动时的3个位移函数,利用改进傅里叶级数法解决位移函数在边界导数不连续... 详细信息

给出曲梁面外自由振动问题的一种数值分析模型,该模型基于改进傅里叶级数法假设位移,并使用瑞利-里兹方法进行求解。首先,应用改进傅里叶级数法表示曲梁面外弯扭振动时的3个位移函数,利用改进傅里叶级数法解决位移函数在边界导数不连续的问题。其次,对曲梁采用人工虚拟弹簧模拟边界条件,通过改变横向位移约束弹簧、扭转约束弹簧和旋转约束弹簧的刚度值来实现任意弹性约束边界,得到曲梁结构振动时的刚度矩阵和质量矩阵。最后,通过求解矩阵特征值问题得到平面曲梁面外自由振动的频率值。此方法克服了以往只能求解某些特定的常规边界条件下振动问题的缺陷。数值算例验证了该方法良好的收敛性和精确性。还采用该方法分析不同弹性约束和截面变化系数对曲梁面外自由振动频率的影响。算例结果表明:对于两端固定圆弧形曲梁,无量纲自振频率随着圆心角变大而变小,但随着长细比增大而增大。

关键词：振动与波自由振动曲梁面外振动改进傅里叶级数

幂函数形式连续变截面梁振动的弯曲固有频率分析

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应用声学 2024年第2期43卷 330-338页

作者：张永康鲍四元苏州市职业大学机电工程学院苏州215104 苏州科技大学土木工程学院苏州215011

为给变截面变幅杆弯曲振动提供设计依据,该文使用微分方程解析法求解变截面梁固有频率。首先,建立变截面梁模型,其中截面面积和惯性矩均按幂次函数变化。得到变截面梁自由振动时挠度的解析表达式,并获得不同边界条件下梁弯曲振动的固有... 详细信息

为给变截面变幅杆弯曲振动提供设计依据,该文使用微分方程解析法求解变截面梁固有频率。首先,建立变截面梁模型,其中截面面积和惯性矩均按幂次函数变化。得到变截面梁自由振动时挠度的解析表达式,并获得不同边界条件下梁弯曲振动的固有频率方程。其中惯性矩所对应幂指数与截面面积的幂指数的差值为4时,可得自振频率方程的精确形式;而幂指数差值不等于4时,给出近似解法。其次,对4种具体的变截面梁求解不同边界下的自振频率,并与瑞利-里兹法所得的自振频率解比较。验证精确解法结果的正确性,并发现近似解法结果的相对偏差在5%以内。该解析方法较瑞利-里兹法具有能快速求解的特点,且易于分析截面参数对梁固有频率的影响。由算例可得,边界和其他参数不变时,梁的同阶次无量纲自振频率随着幂次指数的增加而增加。几何参数中仅截面形状参数改变时,随着形状参数的增加,梁的同阶次无量纲自振频率随之减小,但固定-自由梁的第1阶自振频率除外。

关键词：变截面梁固有频率微分方程解析法

Combined Gradient Representations for Generalized Birkhoffian Systems in Event Space and Its Stability Analysis

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Transactions of Nanjing University of Aeronautics and Astronautics 2021年第6期38卷 967-974页

作者： WANG Jiahang bao siyuan College of Civil Engineering Suzhou University of Science and TechnologySuzhou 215011P.R.China College of Civil and Transportation Engineering Hohai UniversityNanjing 210098P.R.China

The combined gradient representations for generalized Birkhoffian systems in event space are ***,the definitions of six kinds of combined gradient systems and corresponding differential equations are ***,the conditions under which generalized Birkhoffian systems become combined gradient systems are obtained. Finally,the characteristics of combined gradient systems are used to study the stability of generalized Birkhoffian systems in event space. Seven examples are given to illustrate the results.

关键词： generalized Birkhoffian system event space combined gradient systems stability

基于Kerr地基模型的沉管隧道纵向变形与内力的分析

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苏州科技大学学报（自然科学版） 2024年第2期41卷 17-24页

作者：鲍四元顾先明乔海青苏州科技大学土木工程学院江苏苏州215011

假定软土地区沉管隧道地基土为三参数Kerr模型,同时沉管隧道管节等效为Timoshenko梁,采用竖向弹簧及旋转弹簧模拟管节接头,建立沉管隧道的简化计算模型。基于Kerr地基上Timoshenko梁理论,推导出沉管隧道整体结构的解析表达式。通过对比... 详细信息

假定软土地区沉管隧道地基土为三参数Kerr模型,同时沉管隧道管节等效为Timoshenko梁,采用竖向弹簧及旋转弹簧模拟管节接头,建立沉管隧道的简化计算模型。基于Kerr地基上Timoshenko梁理论,推导出沉管隧道整体结构的解析表达式。通过对比基于空间实体有限元的数值模拟结果,合理选取Kerr地基模型中的参数值,然后对Kerr地基模型上土层厚度与压缩模量的敏感性因素进行了分析。结果表明:合理的Kerr地基模型参数使沉管隧道纵向变形结果与实际符合程度好。另外,Kerr地基上土层厚度的增加以及土层压缩模量的减小都会使沉管整体结构纵向变形以及两端弯矩增大。

关键词：沉管隧道 Kerr地基模型 Timoshenko梁纵向变形弯矩

Buckling analysis in stretchable electronics

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npj Flexible Electronics 2017年第1期1卷 30-38页

作者： Bo Wang siyuan bao Sandra Vinnikova Pravarsha Ghanta Shuodao Wang School of Mechanical and Aerospace Engineering Oklahoma State UniversityStillwaterOK 74078USA School of Civil Engineering University of Science and Technology of SuzhouSuzhou 215011China

In the last decade,stretchable electronics evolved as a class of novel systems that have electronic performances equal to established semiconductor technologies,but can be stretched,compressed,and twisted like a rubber *** compliance and stretchability of these electronics allow them to conform and mount to soft,elastic biological organs and tissues,thereby providing attractive opportunities in health care and *** of stretchable electronic systems use an elastomeric substrate to carry an ultrathin circuit mesh that consists of sparsely distributed stiff,thin-film electronic components interconnected by various forms of stretchable metal strips or low-dimension *** the fabrication processes and application of stretchable electronics,the thin-film components or nanomaterials undergo different kinds of in-plane deformation that often leads to out-ofplane or lateral buckling,in-surface buckling,or a combination of all.A lot of creative concepts and ideas have been developed to control and harness buckling behaviors,commonly regarded as pervasive occurrences in structural designs,to facilitate fabrication of stretchable structures,or to enhance *** paper provides a brief review of recent progresses on buckling analysis in stretchable *** buckling mechanics reveals important correlations between the geometric/material properties and system performance(e.g.,mechanical robustness,deformability,structural architecture,and control).These mechanics models and analysis provide insights to design and optimize stretchable electronics for a wide range of important applications.

关键词： buckling rubber twisted

Bioinformatics Analysis of the Human TCF7L2 Gene Promoter Region

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Agricultural Biotechnology 2020年第6期9卷 11-16,21页

作者： siyuan bao Hubei Key Laboratory of Diabetes and Angiopathy Hubei University of Science and TechnologyXianning 437100China School of Basic Medicine Sciences Hubei University of Science and TechnologyXianning 437100China

[Objectives]This study was conducted to investigate characteristics of the human TCF7 L2 gene promoter.[Methods]The 2000 bp sequence of the 5’regulatory region of the human TCF7 L2 gene was obtained from the UCSC genome *** promoter,transcription factor binding sites,CpG islands,SNPs and so on were analyzed by a variety of online softwares.[Results]The bioinformatics analysis results showed there were at least 5 potential promoters in the positive-sense strand of the 2000 bp sequence,among which-242--192 bp,-853--803 bp might contain core promoters.A TATA box and a CpG island with a length of 499 bp were found.241,944 and 1035(positive-sense strand)transcription factor binding sites were predicted by the AliBaba2.1,PROMO and JASPAR softwares,respectively.207 common transcription factor binding sites in the conserved region of human and mouse homologous TCF7 L2 gene promoter were identified with CONREAL program,involving 66 kinds of transcription *** SNPs were found in the promoter region.[Conclusions]The promoter of the human TCF7 L2 gene was analyzed by bioinformatics,and the promoter characteristics were obtained.

关键词： TCF7L2 Promoter Transcription factor Transcription factor binding sites Bioinformatics

Magneto-mechanical effect of magnetic microhydrogel for improvement of magnetic neuro-stimulation

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Nano Research 2023年第5期16卷 7393-7404页

作者： Le Xue Qing Ye Linyuan Wu Dong Li siyuan bao Qingbo Lu Sha Liu Dongke Sun Zonghai Sheng Zhijun Zhang Ning Gu Jianfei Sun State Key Laboratory of Bioelectronics Jiangsu Key Laboratory of Biomaterials and DevicesSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210009China School of Mechanic Engineering Southeast UniversityNanjing 211189China Department of Neurology Affiliated Zhongda HospitalSchool of MedicineInstitution of NeuropsychiatrySoutheast UniversityNanjing 210009China Paul C.Lauterbur Research Center for Biomedical Imaging Key Laboratory for Magnetic Resonance and Multimodality Imaging of Guangdong ProvinceShenzhen Key Laboratory of Ultrasound Imaging and TherapyCAS Key Laboratory of Health InformaticsInstitute of Biomedical and Health EngineeringShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Department of Mental Health and Public Health Faculty of Life and Health SciencesShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China School of Medicine Nanjing UniversityNanjing 210008China

Superparamagnetic iron oxide(SPIO)nanoparticles play an important role in mediating precise and effective magnetic neurostimulation and can help overcome limitations related to penetration depth and spatial ***,nanoparticles readily diffuse in vivo,decreasing the spatial resolution and activation *** this study,we employed a microfluidic means to fabricate injectable microhydrogels encapsulated with SPIO nanoparticles,which significantly improved the stability of nanoparticles,increased the magnetic properties,reinforced the stimulation *** fabricated magnetic microhydrogels were highly uniform in size and sphericity,enabling minimally invasive injection into brain *** long-term residency in the cortex up to 22 weeks and the safety of brain tissue were shown using a mouse *** addition,we quantitatively determined the magneto-mechanical force yielded by only one magnetic microhydrogel using a video-based *** force was found to be within 7–8 pN under 10 Hz magnetic stimulation by both theoretical simulation and experimental ***,electrophysiological measurement of brain slices showed that the magnetic microhydrogels offer significant advantages in terms of neural activation relative to dissociative SPIO nanoparticles.A universal strategy is thus offered for performing magnetic neuro-stimulation with an improved prospect for biomedical translation.

关键词： magnetic stimulation superparamagnetic iron oxide(SPIO)nanoparticles magnetic microhydrogel long-term residency magneto-mechanical effect

In silico Cloning and Bioinformatics Analysis of OsARAB-1 Gene from Rice

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Agricultural Biotechnology 2016年第2期5卷 1-8页

作者： siyuan bao Weidong LIU Dongbo LI School of Basic Medicine Hubei University of Science and Technology School of Nuclear Technology and Chemistry & Biology Hubei University of Science and Technology Horticultural Research Institute Guangxi Academy of Agricultural Sciences

[ Objective] This study aimed to perform in silico cloning and bioinformatics analysis of OsARAB-1 gene from rice. [Method] Using NP 174188.1 as a query probe, the full-length cDNA sequence of OsARAB-1 gene was obtained by in silico cloning. The nucleotide sequence and protein sequence were analyzed by bioinformatics software. [Result] The full-length cDNA of OsARAB-1 gene was obtained. The coding sequence （CDS） of OsARAB-1 gene is 1 086 bp in length, encoding a protein of 361 amino acid residues. OsARAB-1 gene was located in the genome sequence NC 008398.2 （6 769 813 -6 773 213 bp segment） of rice chro- mosome 5 by in silico mapping. OsARAB-1 protein is an extracellular hydrophilic protein, which is relatively stable, slightly alkaline. The secondary structure of OsARAB-1 protein is mainly composed of or-helices and random coils. OsARAB-1 protein has two functional domains ： SGNH hydrolase-type esterase and GDSL li- pase. There are 21 phosphorylation sites and seven O-[3-GlcNAc glycosylation sites. The putative active-site amino acid residues are Ser34, Glyl07, Asn167, Asp333 and His336, respectively. OsARAB-1 protein has the closest genetic relationship with esterase subtype B4FM12 from maize. The expression of OsARAB-1 gene plays an important role in the development and morphogenesis of rice and is related with rice blast resistance. [ Conclusion] This study laid a solid foundation for cloning and functional identification of OsARAB-1 gene with experimental methods.

关键词： Rice Lipase Bioinformatics Amino acid sequence OsARAB-1 gene