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An Algebraic Multigrid Method for Nearly Incompressible Elasticity Problems in Two-Dimensions

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Advances in Applied Mathematics and Mechanics 2009年第1期1卷 69-88页

作者： Yingxiong xiao Shi Shu Hongmei Zhang yuan Ouyang Civil Engineering and Mechanics College Xiangtan UniversityXiangtan 411105People’s Republic of China School of Mathematics and Computational Science Xiangtan UniversityXiangtan 411105People’s Republic of China Department of Mathematics and Physics Hunan University of TechnologyZhuzhou 412008People’s Republic of China

In this paper,we discuss an algebraic multigrid(AMG)method for nearly incompressible elasticity problems in ***,a two-level method is proposed by analyzing the relationship between the linear finite element space and the quartic finite element *** choosing different smoothers,we obtain two types of two-level methods,namely TL-GS and *** theoretical analysis and numerical results show that the convergence rates of TL-GS and TL-BGS are independent of the mesh size and the Young’s modulus,and the convergence of the latter is greatly improved on the order *** the convergence of both methods still depends on the Poisson’s *** fix this,we obtain a coarse level matrix with less rigidity based on selective reduced integration(SRI)method and get some types of two-level methods by combining different *** the existing AMG method used as a solver on the first coarse level,an AMG method can be finally *** results show that the resulting AMG method has better efficiency for nearly incompressible elasticity problems.

关键词： Locking phenomenon algebraic multigrid higher-order finite element two-level method reduced integration

A Preliminary Phylogenetic Analysis of Luidia (Paxillosida: Luidiidae) from Chinese Waters with Cytochrome Oxidase Subunit I (COI) Sequences

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Journal of Ocean University of China 2013年第3期12卷 459-468页

作者： xiao Ning LIU Ruiyu yuan Shuai SHA Zhongli Institute of Oceanology Chinese Academy of Sciences University of Chinese Academy of Sciences Shanxi Normal University

Luidia Forbes （Paxillosida： Luidiidae） are common soft bottom sea stars with 49 described species. Because of substan- tial morphological diversity, the taxonomy of the genus is complex and hasn＇t been resolved definitely. In order to resolve general taxonomic issues, and determine species boundaries and phylogenetic relationships within the genus Luidia, the sequences of tyro- chrome oxidase subunit I （COI） gene from 24 specimens of Luidia, belonging to eight taxa in Chinese waters, were studied. Three sequences of two species in genus Luidia from GenBank were used to analyze the phylogenetie relationships. The molecular phy- logeny exhibited three main clades, each with strong bootstrap support： Clade A including Luidia quinaria from the Sea of Japan; Clade B including seven nominal species （L. quinaria von Martens, L. yesoensis Goto, L. ehangi Liu, Liao and Li, L. orientalis Fisher, L. avicularia Fisher, L. longispina Sladen and L. hardwicki Gray） from Chinese waters; and Clade C including L. maculata Miiller ＆ Troschel from Chinese waters. Our molecular phylogeny results support the morphological Quinaria-Group and Alter- nata-Group assigned by D6derlein. Seven nominal species we sampled do not exhibit genetic distances that are large enough to rec- ognize them as separate species. Cryptic species may exist in ＇Luidia quinaria＇ from the Yellow Sea and the Sea of Japan. Meaning- ful morphological characters need further investigation in Luidia.

关键词： Echinodermata Luidia China DNA taxonomy cryptic species

CD4^(-)CD56^(+)母细胞性浆细胞样树突细胞肿瘤的临床特征

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中国实验血液学杂志 2024年第2期32卷 588-594页

作者：何合胜魏元凤季新悦徐又海杨玉琼靳小可皖南医学院第一附属医院血液科安徽芜湖241001

目的:探讨CD4^(-)CD56^(+)母细胞性浆细胞样树突细胞肿瘤患者的临床表现、病理特点、免疫表型、诊治经过及预后,以提高对此类罕见疾病的认识。方法:对本院就诊的两例CD4^(-)CD56^(+)母细胞性浆细胞样树突细胞肿瘤患者的临床资料、实验... 详细信息

目的:探讨CD4^(-)CD56^(+)母细胞性浆细胞样树突细胞肿瘤患者的临床表现、病理特点、免疫表型、诊治经过及预后,以提高对此类罕见疾病的认识。方法:对本院就诊的两例CD4^(-)CD56^(+)母细胞性浆细胞样树突细胞肿瘤患者的临床资料、实验室资料、治疗方案进行回顾性分析。结果:两例患者均为老年男性,肿瘤累及皮肤、骨髓、淋巴结等部位,皮肤病理显示,CD56、CD123均为阳性,而CD4、CD34、TdT、CD3、CD20、MPO、EBER均为阴性。骨髓流式细胞检测结果显示,CD56、CD123、CD304均为阳性,而髓系、淋系特异性免疫标志均为阴性。两例患者初始对急性淋巴细胞白血病或淋巴瘤样化疗方案非常敏感,但短期内复发,生存期分别为36、4个月。结论:CD4^(-)CD56^(+)母细胞性浆细胞样树突细胞肿瘤罕见,该病容易误诊且预后差,应优先采用急性淋巴细胞白血病或淋巴瘤样的治疗方案改善不良预后。

关键词：母细胞性浆细胞样树突细胞肿瘤诊断治疗临床病理

小学阶段爱国教育与Scratch编程教学实践研究

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Editorial for rare metals, special issue on advanced thermoelectric materials

科学与信息化 2024年第12期 161-163页

作者：袁梦姣胡治铭薛瑞洁长江大学电子信息与电气工程学院湖北荆州 434000 中国电信股份有限公司潜江分公司湖北潜江 433100 滨州职业学院山东滨州 256600

为改善传统思政课堂上爱国教育形式单一、学习枯燥、无法与现实相互联系,以及缺乏学科之间融会贯通的现状,学校以爱国精神为主题,结合教学理论将Scratch编程融入爱国教育课堂当中,使两者紧密结合融会贯通.实践证明,这种教学模式可以进... 详细信息

为改善传统思政课堂上爱国教育形式单一、学习枯燥、无法与现实相互联系,以及缺乏学科之间融会贯通的现状,学校以爱国精神为主题,结合教学理论将Scratch编程融入爱国教育课堂当中,使两者紧密结合融会贯通.实践证明,这种教学模式可以进一步推动信息化教育的普及,弘扬素质教育"以人为本"的精神,在教学过程中不仅能提升教师整体素质,还能激发学生爱国主义情怀和对Scratch编程的兴趣,可达到事半功倍的效果.

关键词：人工智能 Scratch编程爱国主义教育青少年编程教育

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Rare Metals 2018年第4期37卷 257-258页

作者： Yan-Zhong Pei xiao-yuan Zhou Tie-Jun Zhu School of Materials Science and Engineering Tongji University College of Physics Chongqing University School of Materials Science and Engineering Zhejiang University

As a clean energy technology to combat the global energy dilemma and the environmental problems, thermoelectrics that enable a direct conversion between heat and electricity have attracted increasing attention in recent decades. This solid-state, vibrationless technology has long been used for powering the spacecrafts of several deep-space missions and has limited commercial use in niche market, but these are now actively considered for a variety of new applications, such as the conversion of automobile exhaust heat into electricity. Meanwhile, materials research flourishes with the knowledge that significantly improves the thermoelectric efficiency for even more applications. This motivates Rare Metals to have a special issue focusing on thermoelectrics.

关键词： Editorial for rare metals special issue on advanced thermoelectric materials

A New Signature Scheme with Shared Verification

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The Journal of China Universities of Posts and Telecommunications 2006年第2期13卷 66-69页

作者： JIA xiao-yun LUO Shou-shan yuan Chao-wei School of Continuing Education Beijing University of Posts and Telecommunications Beijing 100876 P.R. China School of Software Engineering Beijing University of Posts and Telecommunications Beijing 100876 P.R. China National Key Laboratory of Integrated Service Networks Xidian University Xi'an 710071 P.R. China

With expanding user demands, digital signature techniques are also being expanded greatly, from single signature and single verification techniques to techniques supporting multi-users. This paper presents a new digital signature scheme with shared verification based on the fiat-shamir signature scheme. This scheme is suitable not only for digital signatures of one public key, but also for situations where multiple public keys are required. In addition, the scheme can resist all kinds of collusion, making it more practicable and safer. Additionally it is more efficient than other schemes.

关键词： digital signature shared verification verifiable secret sharing

Spatial analysis of land use change effect on soil organic carbon stocks in the eastern regions of China between 1980 and 2000

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Geoscience Frontiers 2017年第3期8卷 597-604页

作者： xueqi Xia Zhongfang Yang yuan xue Xin Shao Tao Yu Qingye Hou School of Earth Sciences and Resources China University of Geosciences Beijing 100083 China Chongqing Institute of Land Surveying and Planning Chongqing 404000 China

Spatial distributions of 0-20 cm soil carbon sources/sinks caused by land use changes from the year 1980 to 2000 in an area of 2.97 ~ 106 km2 in eastern China were investigated using a land use dataset from a recent soil geochemical survey. A map of soil carbon sourcesJsinks has been prepared based on a spatial analysis scheme with GIg. Spatial statistics showed that land use changes had caused 30.7 ＋ 13.64 Tg of surface soil organic carbon loss, which accounts for 0.33% of the total carbon storage of 9.22 Pg. The net effect of the carbon source was estimated to be ~ 71.49 Tg soil carbon decrease and ~ 40.80 Tg increase. Land use changes in Northeast China （NE） have the largest impact on soil organic carbon storage compared with other regions. Paddy fields, which were mainly transformed into dry farmland in NE, and constructed land in other regions, were the largest carbon sources among the land use types. Swamp land in NE was also another large soil carbon source when it was transformed into dry farmland or paddy fields. Dry farmland in the NE region formed the largest soil organic carbon sink, as some were trans- formed into paddy fields, forested land, and other land use types with high SOCD.

关键词： Land use change Soil organic carbon GIS Eastern China

Expressions of cellular retinoic acid binding proteins I and retinoic acid receptor-β in the guinea pig eyes with experimental myopia

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International Journal of Ophthalmology(English edition) 2011年第2期4卷 131-136页

作者： Jia Huang xiao-Mei Qu and Ren-yuan Chu Department of Ophthalmology Eye and ENT Hospital Affiliated to Fudan University Shanghai 200031 China

·AIM:All-trans retinoic acid (RA) is the only extrinsic biochemical candidate known to date that could act as a growth controller,the aim of this study was to investigate the expression cellular retinoic acid binding proteins I (CRABP-I) and retinoic acid receptor-β (RAR-β) in retina of the guinea pig eyes with experimental myopia.·METHODS:Ninety guinea pigs aged 14 days were equally and randomly divided into three groups:form deprivation (FD),-5D lens,and *** diffusers for FD were white translucent hemispheres,and-5D lenses were used to introduce hyperopic *** was measured with streak retinoscopy after cycloplegia,and axial length was calculated with Cinescan A/B *** harvested at different time points were used to measure RA level with HPLC and expressions of cellular retinoic acid binding proteins I (CRABP-I) and RA receptor-β (RAR-β) were assayed with Western blot and Real-time ***13.0 software was used for statistical analysis.·RESULTS:Up-regulations of CRABP-I and RAR-β in ocular tissues correlated with changes in the refractive status and growth rate of the guinea pig eye (P <0.05).14 days of monocular form-deprivation led to-5.14D myopia and a 0.281mm axial elongation;14 days of monocular defocus produced-3.64D myopia and a 0.163 mm axial *** level of retinal RA started to elevate in 7 days (P <0.05) after visual manipulation in both FD and-5D lens groups and became more prominent by 14 days (P <0.01).The expressions of CRABP-I and RAR-β increased by 14 days after visual manipulation (P <0.05),the mRNA level of RAR-β,however,increased by 7 days after visual manipulation (P <0.05),which suggested that changes of expressions of CRABP-I and RAR-β might lag behind the change of RA.·CONCLUSION:The levels of CRABP-I and RAR-β were elevated in retina of the guinea pig eye with experimental *** the progression of experimental myopia,the retinal RA level increased rapidly,and there might be a positive

关键词： retinoic acid CRABP-I RAR-β experimental myopia guinea pig

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三螺旋模型下高校职业发展教育体系构建研究

哈尔滨学院学报 2024年第2期45卷 120-124页

作者：贺园亚鲁学军李金海泰州学院江苏泰州225300 南京晓庄学院江苏南京211122

做好高校职业发展教育有助于缓解高校毕业生就业问题。当前高校职业发展教育存在就业价值观的引导成效不够显著,就业能力的提升效果不够明显的困境。产生困境的原因在于顶层设计不够完善,系统育人体系尚未形成;资源整合不够有效,协同育... 详细信息

做好高校职业发展教育有助于缓解高校毕业生就业问题。当前高校职业发展教育存在就业价值观的引导成效不够显著,就业能力的提升效果不够明显的困境。产生困境的原因在于顶层设计不够完善,系统育人体系尚未形成;资源整合不够有效,协同育人机制流于形式。而三螺旋模型是高校、企业和政府协同的创新模型,对于职业发展教育体系的构建具有适配性。三螺旋模型下高校职业发展教育体系框架包含一个共识目标、两个核心任务、三个协同主体、四个分支体系,其建构的逻辑进路是努力实现目标协同、规范建立约束制度、创新构建协调机制、充分利用共享资源。

关键词：三螺旋模型高校职业发展教育体系协同育人