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Sparse Modal Decomposition Method Addressing Underdetermined Vortex-Induced Vibration Reconstruction Problem for Marine Risers

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China Ocean Engineering 2024年第2期38卷 285-296页

作者： du Zun-feng ZHU Hai-ming YU jian-xing State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation School of Civil EngineeringTianjin UniversityTianjin 300350China

When investigating the vortex-induced vibration(VIV)of marine risers,extrapolating the dynamic response on the entire length based on limited sensor measurements is a crucial step in both laboratory experiments and fatigue monitoring of real *** problem is conventionally solved using the modal decomposition method,based on the principle that the response can be approximated by a weighted sum of limited vibration ***,the method is not valid when the problem is underdetermined,i.e.,the number of unknown mode weights is more than the number of known *** study proposed a sparse modal decomposition method based on the compressed sensing theory and the Compressive Sampling Matching Pursuit(Co Sa MP)algorithm,exploiting the sparsity of VIV in the modal *** the validation study based on high-order VIV experiment data,the proposed method successfully reconstructed the response using only seven acceleration measurements when the conventional methods failed.A primary advantage of the proposed method is that it offers a completely data-driven approach for the underdetermined VIV reconstruction problem,which is more favorable than existing model-dependent solutions for many practical applications such as riser structural health monitoring.

关键词： motion reconstruction vortex-induced vibration(VIV) marine riser modal decomposition method compressed sensing

Image inpainting using complex 2-D dual-tree wavelet transform

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Applied Mathematics(A Journal of Chinese Universities) 2011年第1期26卷 70-76页

作者： yang jian-bin Department of Mathematics Hohai University Nanjing 210098 China

The dual-tree complex wavelet transform is a useful tool in signal and image process- ing. In this paper, we propose a dual-tree complex wavelet transform （CWT） based algorithm for image inpalnting problem. Our approach is based on Cai, Chan, Shen and Shen＇s framelet-based algorithm. The complex wavelet transform outperforms the standard real wavelet transform in the sense of shift-invariance, directionality and anti-aliasing. Numerical results illustrate the good performance of our algorithm.

关键词： Image inpainting dual-tree complex wavelet transform wavelet shrinkage method.

Does mRNA structure contain genetic information for regulating co-translational protein folding？

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Zoological Research 2017年第1期38卷 36-43页

作者： jian-Rong yang Department of Biology Zhongshan School of Medicine Sun Yat-sen University Guangzhou 510080 China

Currently many facets of genetic information are illdefined. In particular, how protein folding is genetically regulated has been a long-standing issue for genetics and protein biology. And a generic mechanistic model with supports of genomic data is still lacking. Recent technological advances have enabled much needed genome-wide experiments. While putting the effect of codon optimality on debate, these studies have supplied mounting evidence suggesting a role of m RNA structure in the regulation of protein folding by modulating translational elongation rate. In conjunctions with previous theories, this mechanistic model of protein folding guided by m RNA structure shall expand our understandings of genetic information and offer new insights into various biomedical puzzles.

关键词： Translational folding mRNA secondary bias elongation rate Protein structure Codon usage

Diffusion Approximation of a Multitype Re-entrant Line under Smaller-buffer-first-served Policy

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Acta Mathematica Sinica,English Series 2011年第12期27卷 2481-2492页

作者： jian Kui yang School of Science Beijing University of Posts and Telecommunications Beijing 100876 P. R. China

This paper studies a multitype re-entrant line under smaller-buffer-first-served policy, which is an extension of first-buffer-first-served re-entrant line. We prove a heavy traffic limit theorem. The key to the proof... 详细信息

关键词： Multitype re-entrant line heavy traffic reflecting Brownian motion fluid model diffusion approximation

Vector Cascade Algorithms with Infinitely Supported Masks in Weighted L_2 -Spaces

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Acta Mathematica Sinica,English Series 2013年第4期29卷 691-702页

作者： jian Bin yang Department of Mathematics College of SciencesHohai University

In this paper, we shall study the solutions of functional equations of the formΦ=∑α∈Zsa（α）Φ（M.-α）where is an r × 1 column vector of functions on the s-dimensional Euclidean space,a ：= （a（a））α∈Zs is an exponentially decaying sequence of r × r complex matrices called refinement mask and M is an s × s integer matrix such that limn∞ M-n =0. We axe interested in the question, for a mask a with exponential decay, if there exists a solution ~ to the functional equation with each function φj, j = 1,... ,r, belonging to L2（Rs） and having exponential decay in some sense？ Our approach will be to consider the convergence of vector cascade algorithms in weighted L2 spaces. The vector cascade operator Qa,M associated with mask a and matrix M is defined by

关键词： Refinable functions exponentially decaying masks vector cascade algorithms transitionoperators

A Simple Proof for the Stability of Global FIFO Queueing Networks

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Acta Mathematicae Applicatae Sinica 2009年第4期25卷 647-654页

作者： jian-kui yang School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

We study the stability of multiclass queueing networks under the global FIFO （first in first out） service discipline, which was established by Bramson in 2001. For these networks, the service priority of a customer is determined by his entrance time. Using fluid models, we describe the entrance time of the most senior customer in the networks at time t, which is the key to simplify the proof for the stability of the global FIFO queueing networks.

关键词： queueing networks stability fluid models

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研磨处理可注射牙髓细胞外基质促进牙髓再生

中国组织工程研究 2025年第22期29卷 4663-4670页

作者：杨毓茜李文俊赵健陈岗大连医科大学附属第一医院口腔科辽宁省大连市116011

背景:可注射细胞外基质材料用于牙髓组织再生时,首先需要经过胃蛋白酶消化,再与其他基质成分如水凝胶结合使用,而这也意味着天然细胞外基质材料所保留的微环境遭到破坏。目的:探讨研磨处理条件下制备的可注射牙髓细胞外基质材料用于牙... 详细信息

背景:可注射细胞外基质材料用于牙髓组织再生时,首先需要经过胃蛋白酶消化,再与其他基质成分如水凝胶结合使用,而这也意味着天然细胞外基质材料所保留的微环境遭到破坏。目的:探讨研磨处理条件下制备的可注射牙髓细胞外基质材料用于牙髓组织再生的效果。方法:(1)将获取的猪牙来源牙髓组织经过脱细胞处理后制备成牙髓脱细胞基质材料,经过液氮冷冻、高速研磨处理后,制备成可注射牙髓细胞外基质材料,比较可注射牙髓细胞外基质材料和天然牙髓细胞外基质在细胞黏附效率和微结构方面的差异,免疫组化分析可注射牙髓细胞外基质中的细胞外基质蛋白质成分;(2)将接种有牙髓干细胞的可注射牙髓细胞外基质材料注入到牙本质基质材料构建的牙髓腔中,植入裸鼠皮下1,3,5周后取材,观察可注射牙髓细胞外基质材料的体内改建速率及其在裸鼠皮下的异位牙髓组织再生能力。结果与结论:(1)与天然牙髓细胞外基质相比,可注射牙髓细胞外基质材料显著提高了细胞黏附率,并保留了与天然牙髓细胞外基质相似的多孔胶原结构;(2)与天然牙髓细胞外基质相比,免疫组化染色显示可注射牙髓细胞外基质材料中层粘连蛋白、Ⅰ型胶原蛋白和整合素β1的表达没有显著变化,而纤连蛋白的表达显著下降;(3)体内实验显示,可注射牙髓细胞外基质材料具有优异的成血管能力,并促进了牙髓样组织的形成。结果表明,研磨处理的可注射牙髓细胞外基质材料可促进牙髓再生。

关键词：研磨人牙髓干细胞细胞外基质可注射牙髓组织再生支架材料

Thelytokous Diglyphus wani:A more promising biological control agent against agromyzid leafminers than its arrhenotokous counterpart

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Journal of Integrative Agriculture 2023年第12期22卷 3731-3743页

作者： du Su-jie YE Fu-yu XU Shi-yun WAN Wei-jie GUO jian-yang yang Nian-wan LIU Wan-xue State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural SciencesBeijing 100193P.R.China College of Life Sciences Hunan Normal UniversityChangsha 410081P.R.China Western Agricultural Research Center Chinese Academy of Agricultural SciencesChangji 831100P.R.China

Diglyphus wani(Hymenoptera:Eulophidae)is a dominant parasitoid that attacks agromyzid *** reproductive types occur in ***:arrhenotoky(in which virgin females produce only male offspring;and virgin females mate with males to produce bisexual offspring)and thelytoky(in which virgin females produce female offspring).As a potential biological control agent,exploring the differences in the relevant biological parameters of both strains is *** this study,comparisons between the two strains of *** were performed by evaluating the life table and host-killing *** thelytokous strain exhibited significantly better life table parameters than its arrhenotokous *** values for the intrinsic rate of increase,finite rate of increase,net reproductive rate,and fecundity were found in the thelytokous *** thelytokous strain also performed better than the arrhenotokous strain in terms of net parasitism,host-feeding,host-stinging,and total host-killing ***,populations of the thelytokous strain could grow fast and kill more *** conclusion,the thelytokous strain of *** may be the more promising biological agent against agromyzid leafminers compared to its arrhenotokous ***,since the thelytokous strain of *** is only known to produce females,it should be given priority in future biocontrol applications owing to the cost savings of breeding only females.

关键词： parasitoid life table arrhenotoky thelytoky biocontrol applications

Morphological Change and Its Mechanism of Eutectic Silicon for Strontium-Modified Alloy A357

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Journal of Iron and Steel Research International 2004年第1期11卷 47-51页

作者： GUO jian-ting du Xing-hao Institute of Metal Research CAS

The Y 2O 3-CeO 2-ZrO 2 powders were prepared using a co-precipitation process and the corresponding coatings were prepared by plasma spraying. The results show that an optimal composition exists in Y 2O 3-doped CeO 2-ZrO 2, but not in CeO 2-doped Y 2O 3-ZrO 2. The powders mainly contain tetragonal phase and a trace amount of monoclinic phase. The homogeneity in composition, large agglomerate size, ideal particle size distribution and high flowability were obtained. The as-sprayed coatings are composed of non-transformable tetragonal phase, tz′structure, and resistant to transformation under thermal or mechanical stresses.

关键词： powder coating co-precipitation plasma spraying non-transformable tetragonal phase