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A novel particle tracking algorithm using polar coordinate system similarity

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Acta Mechanica Sinica 2005年第5期21卷 430-435页

作者： Xiaodong ruan Wenfeng Zhao The State key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou 310027 China

A new algorithm using polar coordinate system similarity （PCSS） for tracking particle in particle tracking velocimetry （PTV） is proposed. The essence of the algorithm is to consider simultaneously the changes of the distance and angle of surrounding particles relative to the object particle. Monte Carlo simulations of a solid body rotational flow and a parallel shearing flow are used to investigate flows measurable by PCSS and the influences of experimental parameters on the implementation of the new algorithm. The results indicate that the PCSS algorithm can be applied to flows subjected to strong rotation and is not sensitive to experimental parameters in comparison with the conventional binary image cross-correlation （BICC） algorithm. Finally, PCSS is applied to images of a real experiment.

关键词： PIV . PTV . Polar coordinate system similarity .Binary image cross-correlation.

Investigation of the methane hydrate surface area during depressurization-induced dissociation in hydrate-bearing porous media

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Chinese Journal of Chemical Engineering 2021年第4期34卷 324-334页

作者： Xuke ruan Xiao-Sen Li Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640China CAS key Laboratory of Gas Hydrate Guangzhou 510640China

The surface area of hydrate during dissociation in porous media is essentially important for the kinetics of hydrate *** this study,the methane hydrate surface area was investigated by the comparison results of experiments and numerical simulations during hydrate decomposition in porous *** experiments of methane hydrate depressurizationinduced dissociation were performed in a 1D high pressure cell filled with glass beads,an improved and valid 1D corescale numerical model was developed to simulate gas *** conceptual models for hydrate dissociation surface area were proposed based on the morphology of hydrate in porous media,which formed the functional form of the hydrate dissociation surface area with porosity,hydrate saturation and the average radius of sand sediment *** the establishment of numerical model for depressurizationinduced hydrate dissociation in porous media,the cumulative gas productions were modeling and compared with the experimental data at the different hydrate *** results indicated that the proposed prediction equations are valid for the hydrate dissociation surface area,and the graincoating surface area model performs well at lower hydrate saturation for hydrate dissociation simulation,whereas at higher hydrate saturation,the hydrate dissociation simulation from the porefilling surface area model is more ***,the sensitivity analysis showed that the hydrate dissociation surface area has a significant impact on the cumulative gas production.

关键词： Surface area Methane hydrate Hydrate dissociation Hydrate morphology Depressurization

桡骨远端骨折类型与内外固定植入体、人工假体及其骨替代物的关系

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中国组织工程研究与临床康复 2008年第4期12卷 747-751页

作者：薛青阮狄克解放军第二军医大学研究生院2004级硕士研究生班上海市200433 解放军海军总医院骨科北京市100037

学术背景:随着桡骨远端骨折三柱理论的提出,以及各种固定材料不断的出现,桡骨远端骨折治疗中应用内外固定植入体、人工假体、骨替代物的相关研究已成为热点。目的:通过对各种植入体、植入材料的比较选择,进一步认识如何用最简单、最安... 详细信息

学术背景:随着桡骨远端骨折三柱理论的提出,以及各种固定材料不断的出现,桡骨远端骨折治疗中应用内外固定植入体、人工假体、骨替代物的相关研究已成为热点。目的:通过对各种植入体、植入材料的比较选择,进一步认识如何用最简单、最安全的方法处理桡骨远端骨折,使每一位患者、每一种骨折类型能够达到微创、解剖复位、相对稳定的最佳效果。检索策略:应用计算机检索PubMed 1990-01/2006-12相关的文献,检索词"distalradius,fracture,treatment",限定文献语言种类为English。检索到临床观察及基础研究文章882篇,综述类文章159篇。对资料进行初审,纳入文献标准为与桡骨远端骨折治疗上相关的临床观察及基础研究文章169篇,选取针对性强的文章,同一领域的文献则选择近期发表或权威杂志的文章。排除非相关文献及综述872篇。未发表的文献均未列入统计。文献评价:对所得文献进行提炼,按上述标准纳入31篇。资料综合:①石膏、夹板外固定曾经一直是桡骨远端骨折治疗的标准方法。②近年来,随着腕部生物力学及显微解剖学的发展,以及对桡骨远端骨折复位与重建要求的提高,桡骨远端骨折的治疗观念不断更新,不同类型的桡骨远端骨折出现了不同的治疗方法。③经皮穿针复位内固定植入体主要适用于关节外骨折。④外固定支架是治疗桡骨远端骨折的有效方法之一,尤其是桡骨短缩畸形可以通过外固定支架得到矫正。⑤桡骨远端骨折切开复位内固定置入技术的发展主要是由内固定材料设计上的改进及手术入路的选择所引起的。⑥人工腕关节逐渐被应用于临床,为因腕关节严重创伤、关节僵硬和严重创伤性关节炎的患者提供了一个可供选择的新方法。⑦桡骨远端骨折常存在干骺端骨缺损,尤其是老年骨质疏松明显的患者,治疗时常需要进行骨或骨替代物移植,可注射的磷酸钙骨水泥是治疗桡骨远端骨折的一个新选择。结论:任何一种单独的方法都不能处理全部的桡骨远端骨折,对每一位患者、每一种骨折类型,应制定个体化的治疗方案,选择适合的植入物及植入材料,采用多种联合的治疗方法。

关键词：桡骨远端骨折治疗综述文献

Epidemiology of diabetes in Adults Aged 35 and Older from Shanghai,China

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Biomedical and Environmental Sciences 2016年第6期29卷 408-416页

作者： ruan Ye YAN Qing Hua XU Ji Ying YANG Qun di YAO Hai Hong LI Rui SHI Yan division of Chronic Noncommunicable diseases and Injury Shanghai Municipal Center for Disease Control and Prevention

Objective This study aimed to investigate the epidemiology of diabetes in adults from Shanghai, aged 35 and older, in 2013. Methods We estimated the diabetes prevalence in a representative sample of 18,736 adults who were selected through a multistage stratified cluster sampling process. A standard questionnaire containing questions about demographic characteristics and lifestyle factors was distributed. After an overnight fast of at least 10 hours, a venous blood sample was collected from each participant. For each patient without a history of diabetes, another blood sample was drawn 120 min after an oral glucose tolerance test to identify undiagnosed diabetes and prediabetic condition. Results Among Shanghai residents aged 35 and above, the overall weighted prevalence of diabetes was 17.6% [95% confidence interval（CI）： 16.4%-18.8%]. The prevalences were 19.3% in men and 15.8% in women as well as 19.1%, 15.4%, and 16.1% in urban, suburban, and rural residents, respectively. In addition, the weighted prevalence of prediabetes was 16.5%（95% CI： 15.3%-17.8%）, with the prevalences of 16.5% in men, 16.6% in women, 15.2% in urban residents, 18.0% in suburban residents, and 18.5% in rural residents. Among all patients with diabetes, 68.1%（95% CI： 64.3%-71.6%） were aware of their status, 63.5%（95% CI： 60.0%-66.9%） received diabetes treatment, but only 35.1%（95% CI： 32.4%-37.8%） had adequate glycemic control. Conclusion In Shanghai, diabetes and prediabetes are highly prevalent. However, 1/3rd of diabetes cases are undiagnosed, and the rate of glycemic control is low.

关键词： diabetes Prediabetes Prevalence Control

Signaling Role of Sucrose Metabolism in Development

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Molecular Plant 2012年第4期5卷 763-765页

作者： Yong-Ling ruan Australia-China Research Centre for Crop Improvement University of Newcastle Callaghan NSW 2308 Australia School of Environmental and Life Sciences University of Newcastle Callaghan NSW 2308 Australia

In most higher plants, sucrose is the primary organic carbon that is translocated through phloem from photosynthetic leaves （source） into non-photosynthetic tissues （sink） such as seed, fruit, and root. After phloem unloading in sinks, sucrose needs to be degraded into hexoses for diverse use by either invertase （Inv） that hydrolyses sucrose into glucose and fructose or sucrose synthase （Sus） that degrades sucrose into UDPglucose and fructose. By generating hexoses and their derivates, Inv- or Sus-mediated sucrose metabolism and re- lated transport process provide （1） energy source to power cel- lular processes; （2） starting molecules convertible to numerous metabolites and building blocks for synthesizing essential pol- ymers including starch, cellulose, callose, and proteins; and （3） a mechanism to reduce sucrose concentration at the unloading sites to facilitate its source-to-sink translocation, thereby pre- venting feedback inhibition on photosynthesis and sustaining carbon flow at the whole-plant level.

关键词： organic carbon higher plants

The CalderSn-Zygmund Decomposition and Interpolation on Weighted Hardy Spaces

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Acta Mathematica Sinica,English Series 2011年第10期27卷 1967-1978页

作者： Zhuo Ping ruan Department of Mathematics Beijing Normal University Beijing 100875 P. R. China

We apply discrete Littlewood Paley Stein theory, developed by Han and Lu, to establish Calderon Zygmund decompositions and interpolation theorems on weighted Hardy spaces Hp for w C A∞ in both the one-parameter and t... 详细信息

关键词： Calderdn Zygmund decomposition interpolation weighted Hardy spaces discrete Little- wood Paley analysis

Transcriptomic analysis of spinal cord regeneration after injury in Cynops orientalis

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Neural Regeneration Research 2023年第12期18卷 2743-2750页

作者： di Wang Man Zhao Xiao Tang Man Gao Wenjing Liu Minghui Xiang Jian ruan Jie Chen Bin Long Jun Li College of Life Sciences Anhui Normal UniversityWuhuAnhui ProvinceChina College of Animal Science and Technology Nanjing Agricultural UniversityNanjingJiangsu ProvinceChina Laboratory of Reproductive Medicine The Second People’s HospitalWuhuWuhuAnhui ProvinceChina

Cynops orientalis(***)has a pronounced ability to regenerate its spinal cord after ***,exploring the molecular mechanism of this process could provide new approaches for promoting mammalian spinal cord *** this study,we established a model of spinal cord thoracic transection injury in ***,which is an endemic species in *** performed RNA sequencing of the contused axolotl spinal cord at two early time points after spinal cord injury–during the very acute stage(4 days)and the subacute stage(7 days)–and identified differentially expressed genes;additionally,we performed Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathway analyses,at each time *** sequencing showed that 13,059 genes were differentially expressed during *** spinal cord regeneration compared with uninjured animals,among which 4273 were continuously downregulated and 1564 were continuously ***-regulated genes were most enriched in the Gene Ontology term“multicellular organismal process”and in the ribosome pathway at 10 days following spinal cord *** found that multiple genes associated with energy metabolism were down-regulated and multiple genes associated with the lysosome were up-regulated after spinal cord injury,indicating the importance of low metabolic activity during wound *** response-associated pathways were activated during the early acute phase(4 days),while the expression of extracellular matrix proteins such as glycosaminoglycan and collagen,as well as tight junction proteins,was lower at 10 days post-spinal cord injury than 4 days post-spinal cord ***,compared with 4 days post-injury,at 10 days post-injury neuroactive ligand-receptor interactions were no longer down-regulated,up-regulated differentially expressed genes were enriched in pathways associated with cancer and the cell cycle,and SHH,VIM,and Sox2 were prominently *** staining showed

关键词： Cynops orientalis extracellular matrix glial fibrillary acidic protein metabolism neuron RNA sequence salamander spinal cord injury spinal cord regeneration Transcriptomics

INTERFACE DEFORMATION CHARACTERISTICS OF BIMETAL FORMING

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中国有色金属学会会刊：英文版 1998年第1期8卷 35-39页

作者： Peng, Yinghong ruan, Xueyu Shanghai Jiao Tong Univ Shanghai China

ＩＮＴＥＲＦＡＣＥＤＥＦＯＲＭＡＴＩＯＮＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＢＩＭＥＴＡＬＦＯＲＭＩＮＧ①ＰｅｎｇＹｉｎｇｈｏｎｇａｎｄＲｕａｎＸｕｅｙｕＮａｔｉｏｎａｌＤｉｅ＆ＭｏｌｄＣＡＤＥｎｇｉｎｅｒｉｎｇＲｅｓ... 详细信息

ＩＮＴＥＲＦＡＣＥＤＥＦＯＲＭＡＴＩＯＮＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＢＩＭＥＴＡＬＦＯＲＭＩＮＧ①ＰｅｎｇＹｉｎｇｈｏｎｇａｎｄＲｕａｎＸｕｅｙｕＮａｔｉｏｎａｌＤｉｅ＆ＭｏｌｄＣＡＤＥｎｇｉｎｅｒｉｎｇＲｅｓｅａｒｃｈＣｅｎｔｅｒ，Ｓｈａｎｇ...

关键词： bimetal forming interface deformation characteristics frictional element

Unexpected thermal conductivity enhancement in aperiodic superlattices discovered using active machine learning

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npj Computational Materials 2022年第1期8卷 99-105页

作者： Prabudhya Roy Chowdhury Xiulin ruan School of Mechanical Engineering and the Birck Nanotechnology Center Purdue UniversityWest LafayetteIN47907-2088USA

While machine learning(ML)has shown increasing effectiveness in optimizing materials properties under known physics,its application in discovering new physics remains challenging due to its interpolative *** this work,we demonstrate a general-purpose adaptive ML-accelerated search process that can discover unexpected lattice thermal conductivity(κ_(l))enhancement in aperiodic superlattices(SLs)as compared to periodic superlattices,with implications for thermal management of multilayer-based electronic *** use molecular dynamics simulations for high-fidelity calculations ofκ_(l),along with a convolutional neural network(CNN)which can rapidly predictκ_(l)for a large number of *** ensure accurate prediction for the target unknown SLs,we iteratively identify aperiodic SLs with structural features leading to locally enhanced thermal transport and include them as additional training data for the *** identified structures exhibit increased coherent phonon transport owing to the presence of closely spaced interfaces.

关键词： thermal conductivity transport