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Research trend of large-scale supercomputers and applications from the TOP500 and Gordon Bell Prize

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Science China(Information Sciences) 2020年第7期63卷 128-141页

作者： weimin ZHENG Department of Computer Science and Technology Tsinghua University

China is playing an increasingly important role in international supercomputing. In highperformance computing domain, there are two famous awards: The TOP500 list for the fastest 500 supercomputers in the world and the Gordon Bell Prize for the best HPC(high-performance computing)applications. China has been awarded in both TOP500 list and Gordon Bell Prize. In this paper, we review the supercomputers in the latest TOP500 list and seven Gordon Bell Prize applications to show the research trend of the large-scale supercomputers and applications. The first trend we observe is that heterogeneous architectures are widely used in the construction of supercomputing systems. The second trend is that artificial intelligence applications are expected to become one of the main stream applications of *** third trend is that applying heterogeneous systems to complex scientific simulation applications will be more difficult.

关键词： TOP500 Gordon Bell Prize large-scale supercomputer

Next-Generation Desalination Membranes Empowered by Novel Materials:Where Are We Now?

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Nano-Micro Letters 2025年第4期17卷 308-331页

作者： Siqi Wu Lu Elfa Peng Zhe yang Pulak Sarkar Mihail Barboiu Chuyang y.Tang Anthony G.Fane Department of Civil Engineering The University of Hong KongPokfulamHong Kong SARPeople’s Republic of China Institut Européen des Membrane University of MontpellierENSCMCNRS UMR5635Place Eugène BataillonCC 04734095 MontpellierFrance UNESCO Centre for Membrane Science and Technology School of Chemical EngineeringThe University of New South Wales(UNSW)SydneyNSW 2052Australia

Membrane desalination is an economical and energy-efficient method to meet the current worldwide water ***,state-of-the-art reverse osmosis membranes are gradually being replaced by novel membrane materials as a result of ongoing technological *** novel materials possess intrinsic pore structures or can be assembled to form lamellar membrane channels for selective transport of water or solutes(e.g.,NaCl).Still,in real applications,the results fall below the theoretical predictions,and a few properties,including large-scale fabrication,mechanical strength,and chemical stability,also have an impact on the overall effectiveness of those *** view of this,we develop a new evaluation framework in the form of radar charts with five dimensions(i.e.,water permeance,water/NaCl selectivity,membrane cost,scale of development,and stability)to assess the advantages,disadvantages,and potential of state-of-the-art and newly developed desalination *** this framework,the reported thin film nanocomposite membranes and membranes developed from novel materials were compared with the state-of-the-art thin film composite *** review will demonstrate the current advancements in novel membrane materials and bridge the gap between different desalination *** this review,we also point out the prospects and challenges of next-generation membranes for desalination *** believe that this comprehensive framework may be used as a future reference for designing next-generation desalination membranes and will encourage further research and development in the field of membrane technology,leading to new insights and advancements.

关键词： Novel materials Desalination membranes Reverse osmosis Evaluation framework Separation performance

Nonbinary ldpc-coded probabilistic shaping scheme for MIMO systems based on signal space diversity

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Digital Communications and Networks 2023年第3期9卷 779-787页

作者： weimin Kang School of Information and Communication Engineering North University of ChinaTaiyuan030051China

This paper first describes a binary Low-Density Parity-Check(LDPC)-coded Probabilistic Shaping(PS)scheme for Multiple-Input Multiple-Output(MIMO)systems based on Signal Space Diversity(SSD).Second,a Nonbinary(NB)LDPC-coded PS scheme for MIMO systems based on SSD is *** first scheme can be used to obtain a shaping gain,whereas the second can also realize a coding *** theoretical average mutual information of the optimized rotated quadrature amplitude modulation constellations is analyzed and the simulated error per-formance with 22 and 44 MIMO schemes is *** theoretical average mutual information analysis and simulation results show that the proposed NB LDPC-coded PS scheme for MIMO systems based on SSD is reliable and robust,and is therefore suitable for future wireless communication systems.

关键词： Probabilistic shaping Multiple-input multiple-output Signal space diversity Average mutual information

Eu^(3+)/Tb^(3+)掺杂yAG-ZrO_(2)纤维增强铝基复合材料的应力-应变光谱响应

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复合材料学报 2025年第1期42卷 537-547页

作者：孙卫民张振鹏寇生中何玲杨小凤兰州理工大学材料科学与工程学院兰州730050 省部共建有色金属先进加工与再利用国家重点实验室兰州730050 甘肃稀土新材料股份有限公司白银730900

复合材料的失效通常来自于外加载荷的周期循环过程中应力的积累与释放,因此,应力应变监测在纤维增强铝基复合材料的寿命评估和失效预警等方面具有非常重要的影响,但是复合材料变形区的应力应变很难直观地表征,利用稀土的荧光性能对应力... 详细信息

复合材料的失效通常来自于外加载荷的周期循环过程中应力的积累与释放,因此,应力应变监测在纤维增强铝基复合材料的寿命评估和失效预警等方面具有非常重要的影响,但是复合材料变形区的应力应变很难直观地表征,利用稀土的荧光性能对应力-应变进行检测是一种可行的检测方法,其优点是稀土离子的荧光谱线丰富大多尖锐并且容易观测,而且大多对应力敏感性高。选取Eu^(3+)和Tb^(3+)作为发光中心,通过静电纺丝掺杂到yAG-ZrO_(2)复合纤维中,以下简称(yAG:Eu^(3+)-ZrO_(2))cf和(yAG:Tb^(3+)-ZrO_(2))cf。通过热压烧结将(yAG:Eu^(3+)/Tb^(3+)-ZrO_(2))cf和2024铝粉复合,得到(yAG:Eu^(3+)/Tb^(3+)-ZrO_(2))cf增强铝基复合材料。利用动态拉伸荧光传感对(yAG:Eu^(3+)/Tb^(3+)-ZrO_(2))cf增强铝基复合材料在动态拉伸下的发光特性进行了表征,并通过发射光谱重心波长随应力的变化研究内应力的发光传感机制。结果表明,随着拉应力的增加,Eu^(3+)的5D0→^(7)F_(1)跃迁表现出有规律的红移,Tb^(3+)的^(5)D_(4)→^(7)F_(5)跃迁表现出有规律的蓝移,并且Eu^(3+)表现出更高的传感精度。本文为基于Eu^(3+)和Tb^(3+)应力传感器材料的开发提供了思路。

关键词：铝基复合材料稀土离子应力发光应力-应变光谱响应

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线性剪切流下钢悬链式立管涡激振动响应研究

振动与冲击 2025年第3期44卷 81-90页

作者：马博文常杏陈伟民唐文勇上海船舶运输科学研究所有限公司水路交通控制全国重点实验室上海200135 上海交通大学船舶海洋与建筑工程学院上海200240

基于空间分布的尾流振子模型对细长柔性悬链线立管三维涡激振动响应特性进行数值仿真研究。数值模型考虑了立管局部倾角和流固场相对速度对水动力载荷的影响,将尾流振子与立管运动控制方程耦合,构建了悬链线立管非平面来流下的时域动力... 详细信息

基于空间分布的尾流振子模型对细长柔性悬链线立管三维涡激振动响应特性进行数值仿真研究。数值模型考虑了立管局部倾角和流固场相对速度对水动力载荷的影响,将尾流振子与立管运动控制方程耦合,构建了悬链线立管非平面来流下的时域动力学模型,采用二阶精度有限差分法和四阶龙格库塔法求解耦合振动方程。通过将模拟结果与试验结果对比,模型的可靠性得到了一定程度上的验证;随后针对实尺度立管,比较了不同剪切度来流对立管涡激振动幅值、响应传播波形、结构振动频率、锁定区间及流固场能量传递系数的影响。数值结果表明,相比于均匀流,线性剪切流下的立管呈现更复杂的振动响应特性,随着来流剪切度升高,振动幅值逐渐减小,锁定区沿管轴方向呈现区域化特性并伴随显著的多频振动响应。

关键词：悬链线立管涡激振动尾流振子剪切流

Near Optimal Approximations and Finite Memory Policies for POMPDs with Continuous Spaces Dedicated to Professor Peter E. Caines, on the occasion of his 80th birthday

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Journal of Systems Science & Complexity 2025年第01期 238-270页

作者： KARA Ali Devran BAyRAKTAR Erhan yüKSEL Serdar Department of Mathematics Florida State University Department of Mathematics University of Michigan Department of Mathematics and Statistics Queen's University

The authors study.an approximation method for partially observed Markov decision processes(POMDPs) with continuous spaces. Belief MDP reduction, which has been the standard approach to study POMDPs requires rigorous approximation methods for practical applications, due to the state space being lifted to the space of probability measures. Generalizing recent work, in this paper the authors present rigorous approximation methods via discretizing the observation space and constructing a fully observed finite MDP model using a finite length history of the discrete observations and control actions. The authors show that the resulting policy is near-optimal under some regularity assumptions on the channel, and under certain controlled filter stability requirements for the hidden state process. The authors also provide a Q learning algorithm that uses a finite memory of discretized information variables, and prove its convergence to the optimality equation of the finite fully observed MDP constructed using the approximation method.

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Gene therapy for spinal muscular atrophy:perspectives on the possibility of optimizing SMN1 delivery to correct all neurological and systemic perturbations

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Neural Regeneration Research 2025年第7期20卷 2011-2012页

作者： Sharon J.Brown Rafael J.yáñez-Muñoz Heidi R.Fuller School of Pharmacy.and Bioengineering Keele UniversityKeeleUK Wolfson Center for Inherited Neuromuscular Disease TORCH BuildingRJAH Orthopaedic HospitalOswestryUK *** Center of Gene and Cell TherapyDepartment of Biological SciencesSchool of Life Sciences and the EnvironmentRoyal Holloway University of LondonEghamUK

Spinal muscular atrophy(SMA)is a genetic condition that results in selective lower motor neuron loss with concomitant muscle weakness and *** genetic cause of SMA was understood in 1995 when loss or impairment of the survival motor neuron 1(SMN1)gene was identified as the main contributing factor(Lefebvre et al.,1995).This,in combination with the discovery that humans have a“back-up”gene,SMN2,which can produce low levels(approximately 10%)of the full-length functional SMN protein,has led to the generation of SMA-specific gene *** was traditionally classified according to age of symptom onset and developmental milestones achieved,with life expectancy.and severity varying between ***,SMN2 copy number is used as a proxy for the prediction of disease severity,with higher SMN2 copy number typically being associated with reduced severity of SMA,although this relationship is not absolute:some individuals with low SMN2 copy number have less severe SMA phenotypes and vice ***,the etiology of SMA is further complicated by other factors,such as non-typical nucleotide variants and SMN2-independent modifiers of disease severity.

关键词： atrophy traditionally absolute

沙粒在空中排列图案的形状研究——以2023年全国高考江苏卷物理第10题为例

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物理教学 2025年第1期47卷 59-61页

作者：王伟民高爱虎太和县宫集镇中心学校安徽236652 德州市第一中学山东253017

以2023年全国高考江苏卷物理第10题为例,分别更改罐子的水平变速规律和罐子运动的方向这两个题设条件,得到与原高考题目背景材料类似的两个不同变式,分多种情况对做直线运动的罐子抛出沙粒在空中排列图案的形状进行研究。

关键词：罐子沙粒匀加速直线运动排列图案抛物线

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绿色金融、农村产业绿色融合与乡村生态振兴

重庆理工大学学报(社会科学) 2025年第1期39卷 152-166页

作者：唐德祥廖盛兴向为民重庆理工大学经济金融学院重庆400054 重庆工商大学管理科学与工程学院重庆400067

基于我国30个省份2013—2022年的面板数据,采用门槛效应模型检验不同绿色金融发展水平下农村产业绿色融合对乡村生态振兴的异质性影响,同时基于绿色金融与农村产业绿色融合互促共进的耦合关系,运用中介效应模型和调节效应模型进一步探... 详细信息

基于我国30个省份2013—2022年的面板数据,采用门槛效应模型检验不同绿色金融发展水平下农村产业绿色融合对乡村生态振兴的异质性影响,同时基于绿色金融与农村产业绿色融合互促共进的耦合关系,运用中介效应模型和调节效应模型进一步探讨绿色金融、农村产业绿色融合与乡村生态振兴之间的传导机制。结果表明:(1)农村产业绿色融合对乡村生态振兴的促进作用受到绿色金融发展水平的单门槛效应影响;(2)农村产业绿色融合在绿色金融赋能乡村生态振兴过程中发挥了显著的中介作用;(3)绿色金融与农村产业绿色融合的耦合关系能共同作用于乡村生态振兴,显著提高乡村生态文明建设水平。在此基础上,有针对性地提出“健全完善绿色金融体系,推动绿色金融服务创新”“持续推进农村产业绿色融合,助推产业生态化与生态产业化协调发展”“推动绿色金融与农村产业绿色融合的精准对接,协同赋能乡村生态振兴”等政策建议。

关键词：绿色金融农村产业绿色融合乡村生态振兴乡村生态文明建设门槛效应传导机制