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Spectrum analysis of interval process model and its application in uncertain vibration analysis

Science China(Technological Sciences) 2024年第8期67卷 2549-2564页

作者： LI JinWu JIANG chao NI BingYu State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China

In recent years, the authors have extended the traditional interval method into the time dimension to develop a new mathematical tool called the “interval process model” for quantifying time-varying or dynamic uncertainties. This model employs upper and lower bounds instead of precise probability distributions to quantify uncertainty in a parameter at any given time point. It is anticipated to complement the conventional stochastic process model in the coming years owing to its relatively low dependence on experimental samples and ease of understanding for engineers. Building on our previous work, this paper proposes a spectrum analysis method to describe the frequency domain characteristics of an interval process, further strengthening the theoretical foundation of the interval process model and enhancing its applicability for complex engineering problems. In this approach, we first define the zero midpoint function interval process and its auto/cross-power spectral density(PSD) functions. We also deduce the relationship between the auto-PSD function and the auto-covariance function of the stationary zero midpoint function interval process. Next, the auto/cross-PSD function matrices of a general interval process are defined, followed by the introduction of the concepts of PSD function matrix and cross-PSD function matrix for interval process vectors. The spectrum analysis method is then applied to random vibration problems, leading to the creation of a spectrum-analysis-based interval vibration analysis method that determines the PSD function for the system displacement response under stationary interval process excitations. Finally, the effectiveness of the formulated spectrum-analysis-based interval vibration analysis approach is verified through two numerical examples.

关键词： interval process spectrum analysis power spectral density(PSD) time-varying uncertainty uncertain vibration analysis

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Evaluation on the state of sand filling layer and the influence on segment deformation of immersed tunnels

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Underground Space 2024年第3期16卷 224-238页

作者： Ziyao Xu Ailan Che chao Su School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China CCCC Second Harbor Engineering Company Ltd. Wuhan 430040China

The immersed tunnel is considered an effective solution for traffic problems across rivers and *** sand filling layer,as an important part of immersed tunnel foundation treatments,directly affects segment attitude *** to difficulties in quality control of concealed construction and the complex hydrodynamic environment,the sand filling layer is prone to compaction defects,further leading to changes in segment ***,limited by structural concealment and state complexity,most studies consider the sand filling layer part of the foundation to study its impact on settlement while neglecting its influence on segment *** research proposes an evaluation method for the sand filling layer state based on elastic wave testing and the elastic wave characteristic parameters selected come from analysis of the time domain,frequency domain and time–frequency *** classifying the elastic wave characteristic parameters through the K-means clustering method,the relationship between the state of the sand filling layer and the elastic wave characteristic parameters is *** state of the sand filling layer is divided into dense,incompact,and void.A numerical model is established based on the Guangzhou BI-UT immersed tunnel with incompact and void sand filling layer states to simulate deformation and *** results indicate that the settlement of the tunnel segment is low in the eastern region and high in the western region due to the presence of a less dense sand filling layer,with a maximum differential settlement of 0.04 *** evaluation method plays a crucial role in guiding the construction of immersed tube tunnels.

关键词： Sand filling layer state Immersed tunnel Elastic wave test Clustering algorithm

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一种计算框架-剪力墙临界承载力的解析法

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振动与冲击 2020年第19期39卷 48-54,77页

作者：兰树伟周东华双超韩春秀昆明理工大学建筑工程学院昆明650500 云南民族大学土木工程系昆明650504

针对规范计算长度系数法无法考虑框架与剪力墙之间的相互作用、同层柱之间的相互支援以及层与层的支援作用的不足,提出了一种计算框架-剪力墙结构临界力的解析算法。利用“三弹簧-摇摆柱”力学模型作为基本单元来计算单个框架柱的稳定... 详细信息

针对规范计算长度系数法无法考虑框架与剪力墙之间的相互作用、同层柱之间的相互支援以及层与层的支援作用的不足,提出了一种计算框架-剪力墙结构临界力的解析算法。利用“三弹簧-摇摆柱”力学模型作为基本单元来计算单个框架柱的稳定承载力,进而通过基本单元(刚度和荷载)在各楼层内组装,之后再将各楼层的刚度及荷载进行楼层间的组装,将求解框架-剪力墙临界承载力转化为求解结构的楼层抗侧刚度,进而推导了可直接计算有侧移框架-剪力墙临界力的简单实用的计算公式,该公式能考虑这三种支援作用,即同层各柱间的支援作用,楼层间的相互支援作用,以及剪力墙对框架的支援作用,有效地弥补了规范尚无法求解框架-剪力墙临界力的不足。算例计算结果表明:该方法有很好的精度及准确性,可供工程设计使用。

关键词：框架-剪力墙内刚度外刚度临界内外刚度比系数临界因子临界力

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Uncovering the largest negative carbon isotope excursion in Earth history

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Science China Earth Sciences 2024年第3期67卷 885-889页

作者： chao LI Haiyang WANG State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu 610059China Institute of Sedimentary Geology Chengdu University of TechnologyChengdu 610059China Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources Chengdu University of TechnologyChengdu 610059China International Center for Sedimentary Geochemistry and Biogeochemistry Research Chengdu University of TechnologyChengdu 610059China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China

The carbon cycle plays a pivotal role in regulating Earth’s surface environment through atmospheric-oceanic acid-base and redox processes, functioning as the engine driving the evolution of our planet’s surface. A deep understanding of the carbon cycle’s evolution is thus essential for our understanding of the evolution of our planet’s habitability.

关键词： carbon planet evolution

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Inhibition of Bcl-6 Expression Ameliorates Asthmatic Characteristics in Mice

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Current Medical Science 2024年第1期44卷 110-120页

作者： Chang-zhi ZHOU Xiong XIONG Wei-jun TAN Ya-fei WANG Zhen YANG Xue-ying LI Xiu-wen YANG Xiao-fan LIU Sun-feng YU Liang-chao WANG shuang GENG Department of Respiratory and Critical Care Medicine The Central Hospital of WuhanTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430014China Department of General Surgery Wuhan Wuchang HospitalWuhan University of Science and TechnologyWuhan 430063China

Objective The function of Bcl-6 in T follicular helper(Tfh)cell maturation is indispensable,and Tfh cells play a pivotal role in *** study investigated the impact of Bcl-6 on asthmatic *** The microscopic pathological alterations,airway resistance(AR),and lung compliance(LC)were determined in asthmatic mice and Bcl-6 interference *** surface molecular markers of Tfh cells and the Bcl-6 mRNA and protein expression were determined by flow cytometry,RT-qPCR,and Western blotting,*** relationships between the Tfh cell ratio and the IgE and IgG1 concentrations in peripheral blood mononuclear cells(PBMCs)and bronchoalveolar lavage fluid(BALF)were *** Asthmatic inflammatory changes were observed in the lung tissue and were attenuated by Bcl-6 siRNA and dexamethasone(DXM).Asthmatic mice exhibited an increased AR and a decreased LC,while Bcl-6 siRNA or DXM mitigated these *** percentages of Tfh cells and eosinophils were significantly increased in the asthmatic mice,and they significantly decreased after Bcl-6 inhibition or DXM ***-qPCR and Western blotting analyses revealed that the Bcl-6 expression level in PBMCs was significantly higher in asthmatic mice,and it decreased following Bcl-6 inhibition or DXM *** IgE expression in the serum and BALF and the B cell expression in PBMCs exhibited a similar *** asthmatic mice,the ratio of Tfh cells in the peripheral blood showed a strong positive correlation with the IgE levels in the serum and BALF,but not with the IgG1 *** The amelioration of airway inflammation and airway hyper-responsiveness is achieved through Bcl-6 suppression,which effectively hinders Tfh cell differentiation,ultimately resulting in a concurrent reduction in IgE production.

关键词： Bcl-6 Tfh asthma airway hyper-responsiveness mouse model

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有侧移框架临界承载力的实用计算方法

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振动与冲击 2019年第11期38卷 180-186,202页

作者：兰树伟周东华双超韩春秀昆明理工大学建筑工程学院昆明650500 云南民族大学电气工程学院昆明650500

基于结构平衡稳定状态的物理意义,提出了结构外刚度和内刚度的概念,得到了结构临界稳定状态表达式,利用框架重复单元推导了框架结构整体抗侧刚度的计算公式,获得了可直接计算框架临界承载力的简单实用的计算公式。该公式避免了传统计算... 详细信息

基于结构平衡稳定状态的物理意义,提出了结构外刚度和内刚度的概念,得到了结构临界稳定状态表达式,利用框架重复单元推导了框架结构整体抗侧刚度的计算公式,获得了可直接计算框架临界承载力的简单实用的计算公式。该公式避免了传统计算长度系数法逐个构件验算的不便,而且可很好地考虑同层柱之间的相互支援以及层与层的支援作用,避免了计算长度系数法可能因此造成的不合理设计,弥补了规范计算长度系数法的不足。算例计算结果表明:该方法具有很好的精度及准确性,而且对复杂的框架结构也具有很好的适用性,可供工程设计及理论计算使用。

关键词：外刚度内刚度框架结构楼层重复单元整体抗侧刚度临界承载力

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Single transmembrane GPCR modulating proteins:neither single nor simple

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Protein & Cell 2024年第6期15卷 395-402页

作者： Meng Wang Jianjun Lyu chao Zhang Department of Plastic and Reconstructive Surgery Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai 200011China Hubei Topgene Research Institute of Hubei Topgene Biotechnology Co. LtdEast Lake High-Tech Development ZoneWuhan 430205China Fundamental Research Center Shanghai Yangzhi Rehabilitation Hospital (Shanghai Sunshine Rehabilitation Center)Tongji UniversityShanghai 200092China

The discovery of G-protein coupled receptor(GPCR)accessory proteins has fundamentally redefined the pharmacological concept of GPCR signaling,demonstrating a more complex molecular basis for receptor specificity on the plasma membrane and impressionable downstream intracellular *** accessory proteins not only contribute to the proper folding and trafficking of receptors but also exhibit selectable receptor preferences.

关键词： specificity GPCR neither

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Nonlinear aeroelastic analysis of a twin-tail boom UAV with rudder freeplay nonlinearities

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Chinese Journal of Aeronautics 2024年第9期37卷 276-296页

作者： Liuyue BAI Zhigang WU chao YANG School of Aeronautic Science and Engineering Beihang UniversityBeijing 10019lChina

The issue of nonlinear structural freeplays in aircraft has always been a significant *** study investigates the aeroelastic characteristics of a twin-tail boom Unmanned Aerial Vehicle(UAV)with simultaneous freeplay nonlinearity in its left and right rudders.A comprehen-sive Limit Cycle Oscillation(LCO)solution route is proposed for complex aircraft with multiple freeplays,which can consider both accuracy and *** the first time,this study reveals the unique LCO characteristics exhibited by twin-tail boom UAVs with rudder freeplays and pro-vides simulations and explanations of interesting phenomena observed during actual *** governing equations are established using the free-interface component mode synthesis method,and the LCOs of the system are mainly solved through the improved time-domain numerical con-tinuation method and frequency-domain numerical continuation ***,the study investigates the influence of the left and right rudder freeplay size ratio on the LCO *** results demonstrate that the twin-tail boom UAV exhibits two stable LCO types:close and dif-fering left and right rudder *** proposed method successfully describes the complete LCO behaviors of the ***,this study makes significant contributions to our understand-ing of the aeroelastic behavior of twin-tail boom UAVs with rudder freeplays.

关键词： Aeroelasticity Freeplay nonlinearity Limit cycle oscillation Numerical continuation Component mode synthesis

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A hybrid WUDT-NAFnet for simultaneous source data deblending

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Petroleum Science 2024年第3期21卷 1649-1659页

作者： chao-Fan Ke Shao-Huan Zu Jun-Xing Cao Xu-Dong Jiang chao Li Xing-Ye Liu Key Laboratory of Earth Exploration and Information Technology of Ministry of Education Chengdu University of Technology State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology College of Geophysics Chengdu University of Technology

Simultaneous source technology,which reduces seismic survey time and improves the quality of seismic data by firing more than one source with a narrow time interval,is compromised by the massive blended ***,deblending algorithms have been developed to separate this ***,deep learning(DL)has been proved its great potential in suppressing the *** most popular DL method employs neural network as a filter to attenuate the blended noise in an iterative estimation and subtraction framework(IESF).However,there are still amplitude distortion and blended noise residual problems,especially when dealing with weak signal submerged in strong *** address these problems,we propose a hybrid WUDT-NAFnet,which contains two *** first network is a wavelet based U-shape deblending transformer network(WUDTnet),incorporated into IESF as a robust regularization term to iteratively separate the blended *** second network is a nonlinear activate free network(NAFnet)designed to recover the event amplitude and further suppress the weak noise residual in *** the hybrid network,the blended noise can be separated purposefully and *** using synthetic and field seismic data demonstrate that the WUDTNAFnet outperforms traditional curvelet transform(CT)based method and the deblending transformer(DT)model in terms of ***,for field applications,the data augmentation method of bicubic interpolation is applied to mitigate the feature difference between synthetic and field ***,the trained network exhibits strong signal preservation ability in numerical field example without requiring additional training.

关键词： Simultaneous-source Deblending Deep learning Transformer

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Transcriptome-based Discovery of Fusarium graminearum Stress Responses to FgHV1 Infection

Transcriptome-based Discovery of Fusarium graminearum Stress...

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中国植物病理学会2016年学术年会

作者： WANG shuang-chao ZHANG Jing-ze LI Peng-fei QIU De-wen GUO Li-hua State Key Laboratory for Biology of Plant Disease and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural Science Walloon Centre of Industrial Biology Gembloux Agro-Bio TechUniversity of Liege

Fusarium graminearum hypovirus 1(FgHV1),which is phylogenetically related to Cryphonectria hypovirus 1(CHV1),is a virus in the family Hypoviridae that infects the plant pathogenic fungus *** hypovirus FgHV1 infection results in defects in mycelial growth and spore production,it does not attenuate the virulence of the host(hypovirulence).We now report that the vertical transmission rate of FgHV1 through asexual spores reached 100%and that hypovirus FgHV1 infection did not alter phenotypes such as pigment production and sexual development Using RNA deep sequencing,we performed genome-wide expression analysis to reveal pheno type-related genes with expression changes in response to FgHV1 infection.A total of 248 geneswere differentially expressed,suggesting that hypovirus infection causes a significant alteration of fungal gene *** two times as many genes were up-regulated as were down-regulated.A differentially expressed gene enrichment analysis identified a number of important *** processes,cellular redox regulation,the ubiquitination system and transcription factors were the most affected categories in *** challenged with ***-like protease,p20,encoded by FgHV1 could cause HO accumulation in Nicotiana benthamiana leaves and programmed cell death in *** *** NN ***,hypovirus FgHV1 may trigger the RNA silencing pathway in ***.

关键词： Fusarium graminearum FgHV1 Transcriptome Stress responses Cellular redox regulation

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