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Simulation, experimentation, and collaborative analysis of adjacent heat exchange modules in a vehicular cooling system

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第6期14卷 417-426页

作者： Yu-qi HUANG rui HUANG Xiao-li YU Feng lv Power Machinery and Vehicular Engineering Institute Zhejiang University Department of Mechanical and Aerospace Engineering Monash University-Clayton

A cooling system consisting of several heat exchange modules is a necessary part of an automobile, and its performance has a direct effect on a vehicle's energy consumption. Heat exchangers, such as a charged air cooler (CAC), radiator, oil cooler, or condenser have different structures and can be arranged in various orders, and each combination may produce different effects because of interactions among them. In this study, we aimed to explore the principles governing interactions among adjacent heat exchangers in a cooling system, using numerical simulation and experimental technology. 3D models with different combinations were developed, compared, and analyzed comprehensively. A wind tunnel test platform was constructed to validate the computational results. We found that the heat dissipation of the modules was affected slightly by their relative position (the rules basically comply with the field synergy principle), but was independent of the modules' spacing within a certain distance range. The heat dissipation of one module could be effectively improved by restructuring, but with a penalty of higher resistance. However, the negative effect on the downstream module was much less than expected. The results indicated that the intensity of heat transfer depends not only on the average temperature difference between cold and hot mediums, but also on the temperature distribution.

关键词： Collaborative analysis Heat exchangers Field synergy principle Computational fluid dynamics (CFD) Wind tunnel

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数字生态推动实数融合的机理与路径

广东社会科学 2025年第1期 80-93页

作者：胡莹吕慧中中山大学马克思主义学院广州510275 广东省习近平新时代中国特色社会主义思想研究中心

数字生态是以数据驱动为内在运行机制,以数字平台为重要运营载体,广泛连接政府、企业、个人等多元主体的开放性经济社会生态系统。打造良好的数字生态,提高数字资源配置效率,协调多元主体之间的互动合作,是实体经济与数字经济深度融合... 详细信息

数字生态是以数据驱动为内在运行机制,以数字平台为重要运营载体,广泛连接政府、企业、个人等多元主体的开放性经济社会生态系统。打造良好的数字生态,提高数字资源配置效率,协调多元主体之间的互动合作,是实体经济与数字经济深度融合的保证,也是推动实数深度融合的必由之路。从作用机理来看,数字生态为实数融合提供数字化的资源环境,并通过数字平台赋能多元主体数字能力的提升,从而在其与环境的交互中推动数字化创新。在具体实践层面,数字生态通过产业组织形态的地理与虚拟双重集聚实现空间融合,通过数字产业化与产业数字化协同发展促进业务融合,通过技术创新与场景创新互动演进促进创新融合。当前,我国实数融合发展在数字基础设施建设、数据要素市场培育、数字平台生态治理等方面还存在一些亟待解决的难点问题,数字化发展不平衡现象仍然存在,需要加强核心技术攻关,优化基础设施布局,加快推进数据要素市场体系建设,营造开放、健康、安全的数字生态。

关键词：数字生态实数融合实体经济数字经济

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Finite Groups with Some Bounded Codegrees

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Acta Mathematica Sinica,English Series 2024年第7期40卷 1778-1784页

作者： dong Fang YANG Yu ZENG Heng lv School of Mathematics and Statistics Southwest UniversityChongqing400715P.R.China Department of Mathematics Changshu Institute of TechnologyChangshu215500P.R.China

For a characterχof a finite group G,the number cod(χ) := ∣G:ker(χ)∣/χ(1)is called the codegree ofχ.In this paper,we give a solvability criterion for a finite group G depending on the minimum of the ratioχ(1)^(... 详细信息

关键词： Finite group codegree degree simple group

Clinical biomarkers of perioperative neurocognitive disorder:initiation and recommendation

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Science China Life Sciences 2025年

作者： Jianhui Liu Cheng Li Junyan Yao Lei Zhang Xuan Zhao Xin lv Zhiqiang Liu Changhong Miao Yingwei Wang Hong Jiang Weifeng Yu Tianlong Wang dongxin Wang E Wang Xiaoping Gu Hailong dong Junli Cao Yuan Shen Weihong Song Shengdi Chen Yanjiang Wang Guanghui Liu Zhongcong Xie Lize Xiong Jialin C.Zheng Department of Anesthesiology Shanghai Ninth People’s Hospital School of Medicine Shanghai Jiao Tong University Department of Anesthesiology Shanghai Renji Hospital Shanghai Jiao Tong University School of Medicine Department of Anesthesiology Xuanwu Hospital Capital Medical University Department of Anesthesiology and Critical Care Medicine Peking University First Hospital Department of Anesthesiology Xiangya Hospital of Central South University Department of Anesthesiology Nanjing Drum Tower Hospital The Affiliated Hospital of Nanjing University Medical School Department of Anesthesiology Xijing Hospital Fourth Military Medical University Jiangsu Province Key Laboratory of Anesthesiology Xuzhou Medical University Department of Anesthesiology The Affiliated Hospital of Xuzhou Medical University Shanghai Mental Health Center of Shanghai Jiao Tong University Department of Anesthesiology Tongji Hospital School of Medicine Tongji University Anesthesia and Brain Research Institute Tongji University Oujiang Laboratory Key Laboratory of Alzheimer’s Disease of Zhejiang Province Zhejiang Provincial Clinical Research Center for Mental Disorders Institute of Aging School of Mental Health Affiliated Kangning Hospital The Second Affiliated Hospital Yuying Children’s Hospital Wenzhou Medical University Department of Neurology Ruijin Hospital Shanghai Jiao Tong University School of Medicine Department of Neurology Daping Hospital Third Military Medical University State Key Laboratory of Membrane Biology Institute of Zoology Chinese Academy of Sciences Geriatric Anesthesia Research Unit Department of Anesthesia Critical Care and Pain Medicine Massachusetts General Hospital Harvard Medical School Shanghai Key Laboratory of Anesthesiology and Brain Functional Modulation Clinical Research Center for Anesthesiology and Perioperative Medicine Translational Research Institute of Brain and Brain-Like Intelligence Shanghai Fourth People’s Hospital School of Medicine Tongji University Center for Tr

Perioperative neurocognitive disorder(PND) is a significant neurological complication in aging perioperative patients that impacts postoperative cognition. PND is currently diagnosed through cognitive function testing, which is limited by its subjectivity and time requirements. Thus, the identification of biomarkers to assess PND onset is a priority to identify at-risk individuals and enable interventions and treatments to patient outcomes. This article synthesizes expert perspectives on brain aging and PND, presents the latest clinical evidence on PND biomarkers(imaging, electroencephalography, and molecular biomarkers), and delves into the relationship between PND and other age-related cognitive disorders. Thorough review of PND research identified several biomarkers with high sensitivity and specificity,offering a solid scientific foundation to predict and diagnose PND. These biomarkers not only enhance diagnostic accuracy for clinicians but also provide opportunities for earlier intervention and more effective treatment, potentially enhancing patient outcomes and quality of life.

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社会研究方法的典型性与等价性之辨——知识生产的方法生态系统

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南开学报(哲学社会科学版) 2025年第1期 45-60页

作者：吕鹏陈典涵中南大学公共管理-自动化-法学院、社会计算研究中心湖南长沙410083 北京大学武汉人工智能研究院中南大学公共管理学院社会学系湖南长沙410083

社会科学研究核心任务之一是“通过社会现象研究社会本质”,即从社会现象(实证研究资料)中获取对社会本质的知识过程。在此知识实践过程中,出现了两个方向的分野。一是典型性研究,以微观过程与深度分析为核心特征(解剖一只麻雀),侧重行... 详细信息

社会科学研究核心任务之一是“通过社会现象研究社会本质”,即从社会现象(实证研究资料)中获取对社会本质的知识过程。在此知识实践过程中,出现了两个方向的分野。一是典型性研究,以微观过程与深度分析为核心特征(解剖一只麻雀),侧重行动与过程分析;二是代表性研究,以局部对总体的推广性、代表性为要求,侧重结构性分析,核心是追求等价性。从典型性到等价性,不同的方法存在各异的二元属性权重配置,现有方法集合形成了一个谱系生态相位图。相关方法的理论效力与相对位势分析,部分得到了1998—2024中文CSSCI数据库的科研大数据的实证支撑。智能体模拟(ABM)能够兼顾研究的典型性、代表性,有机整合并均衡两个维度的知识生产能力,助力社会行动—结构对流分析。方法系统不是一成不变,存在演化的动力学逻辑。展望未来,随着新技术持续涌现,研究方法必将走向新的生态,助力社会科学的知识生产与高质量发展。

关键词：社会研究典型性等价性方法生态演进动力学

Preparation and properties of magnetic iron oxide nanotubes

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Particuology 2008年第5期6卷 334-339页

作者： Baoliang lv Yao Xu dong Wu Yuhan Sun State Key Laboratory of Coal Conversion Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 China Graduate University of the Chinese Academy of Sciences Beijing 100039 China

Magnetite （Fe3O4） nanotubes were prepared by reducing synthesized hematite （α-Fe2O3） nanotubes in 5%H2＋95% Ar atmosphere, and then maghemite （γ-Fe2O3） nanotubes were obtained by re-oxidizing the Fe3O4 nanotubes. The nanotube structure was kept from collapsing or sintering throughout the high temperature reducing and re-oxidizing processes. The coercivities of the Fe304 and γ-Fe2O3 nanotubes synthesized were found to be 340.22 Oe and 342.23 Oe, respectively, both higher than other nanostructures with the same phase and of similar size. Both adsorbed phosphate and the nanotube structure are considered responsible for this high coercivity.

关键词： Nanostructures Iron oxides Nanotubes Magnetic properties

Hydrothermal synthesis and characterization of NiS flower-like architectures

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Particuology 2012年第6期10卷 783-788页

作者： Hai Zhou Baoliang lv dong Wu Yuhan Sun Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of Sciences Graduate University of the Chinese Academy of Science Low Carbon Conversion Center Shanghai Advanced Research InstituteChinese Academy of Sciences

Under the influence of thiocyanate anions （SCN-） and cetyltrimethyl ammonium bromide （CTAB）, NiS flower-like architectures were successfully synthesized by a one-step hydrothermal method. The syn-thesized flower-like architectures, with a multilayered and highly ordered texture, have diameters of several micrometers. X-ray powder diffraction （XRD） shows that the NiS flower-like architectures are rhombohedral crystalline. On the basis of condition-dependent experiments, the diffusion-limited aggregation （DLA） model and cage effect were used to explain the growth process of rhombohedral crystalline NiS flower-like architectures. Magnetic measurements showed that the coercivity （He） of the as-obtained NiS flower-like architectures was 102.14 Oe.

关键词： Nanostructures Chemical synthesis Electron microscopy Magnetic properties

A Novel Soft Sensor for Chinese Tea Characterization

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稀有金属材料与工程 2006年第A3期35卷 417-420页

作者： Wener lv Yonggui dong Ensheng dong Huibo Jia State Key Laboratory of Precision Measurement Technology and Instruments Dept. of Precision Instruments and Mechanology Tsinghua University Beijing 100084 China

In cases of measurement,like the beverage discrimination or waste water monitoring,since sensors with direct measuring for specific variables cannot be practically applied,the interest in soft sensor technology,which is based on the acquisition and analysis for a lot of information variables,has rapidly *** article presents a novel soft sensor which activates a voltage signal between two specially-designed electrodes,inside the Chinese tea solution,and measures the produced *** proposed sensor discriminated four different kinds of tea,and the dissolution processes of two of them are described as curves on a bidimensional *** results indicate that the proposed approach can also be adapted in characterization or discrimination for other solutions.

关键词： soft sensor characterization Chinese tea PCA

广域滑坡易发性多分支网络评估及动态变化分析

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测绘学报 2025年第1期54卷 104-122页

作者：吕继超张瑞何旭洪瑞凯沙马阿各刘国祥西南交通大学地球科学与工程学院四川成都611756

针对卷积神经网络(CNN)在滑坡易发性评估中因数据通道叠加导致过度关注特定因子的问题,本文提出了一种多分支数据融合的滑坡易发性评估模型,该模型通过多分支结构和自适应定权机制实现多源遥感数据的特征融合,进而借助深度CNN充分提取... 详细信息

针对卷积神经网络(CNN)在滑坡易发性评估中因数据通道叠加导致过度关注特定因子的问题,本文提出了一种多分支数据融合的滑坡易发性评估模型,该模型通过多分支结构和自适应定权机制实现多源遥感数据的特征融合,进而借助深度CNN充分提取评价因子的语义信息以准确评估滑坡易发性。试验选取青藏高原东南部作为典型研究区,与随机森林、浅层CNN和ResNet101模型的对比分析表明,本文提出的多分支网络模型在广域滑坡易发性评估方面更具优势,其准确率、精确率、召回率、F 1值、曲线下面积(AUC)和频率比精度均优于现有模型(分别达到0.88、0.89、0.92、0.90、0.92和0.97)。在此基础上,结合连续5年的滑坡易发性评估结果,进一步探讨植被、降雨量等环境因子波动与滑坡易发性指数变化间的内在关联,并通过变异系数掲示滑坡易发性指数时空变化规律。研究结果表明,近5年岷江-大渡河流域、雅砻江流域以及雅鲁藏布江流域受归一化植被指数和局部降雨变化的影响,整体风险均呈现出先增大后减小的变化特征;而金沙江流域和怒江-澜沧江流域植被和降雨量波动较小,滑坡易发性等级总体保持在中高风险水平。本文所提出的模型与方法可为同类区域滑坡风险评估提供参考和借鉴。

关键词：滑坡易发性评估多分支数据融合卷积神经网络多源遥感动态变化