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Co/carbon nanofiber with adjustable size and content of Co nanoparticles for tunable microwave absorption and thermal conductivity

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Journal of Materiomics 2024年第1期10卷 124-133页

作者： Shaohua Shi Pengpeng Mou Dao Wang Xiangying Li Shengjie Teng Maofan Zhou Xiaolong Yu zhen deng Gengping Wan Guizhen Wang State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikouHainan570228China Department of Radiology Central South University Xiangya School of Medicine Affiliated Haikou HospitalHaikou570208China College of Science Qiongtai Normal UniversityHaikouHainan571127China Sanya Nanfan Research Institute of Hainan University Hainan Yazhou Bay Seed LaboratorySanya572025China

Electromagnetic pollution and heat dissipation problems are becoming increasingly worthy of attention due to the rapid development of electronic devices,which puts forward an urgent demand for microwave absorbers with excellent thermal management ***,high-performance Co/carbon nanofiber(Co/CNF)microwave absorbers with high thermal conductivity were fabricated by facile step-by-step *** microwave absorption properties can be readily tuned by adjusting the content and size of Co nanoparticles through concentration gradient *** from the formation of dielectric and magnetic coupling network,Co/CNF composites possess intensive dipole polarization,interface polarization,and magnetic *** optimal Co/CNF composites exhibit outstanding microwave absorption performance with a minimum reflection loss(RL)of−53.0 dB at 11.44 GHz,and a maximum effective absorption bandwidth(EAB)of 5.5 *** addition,the thermal conductivities of the Co/CNF-natural rubber(Co/CNF-NR)composites are significantly *** work may inspire the exploration of high-efficiency heat-conduction microwave absorbers based on CNF.

关键词： Carbon nanofiber Co nanoparticle Microwave absorption Heat conductivity

Differentiation and immunosuppressive function of CD19^(+)CD24^(hi)CD27^(+) regulatory B cells are regulated through the miR-29a-3p/NFAT5 pathway

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Hepatobiliary & Pancreatic Diseases International 2024年第5期23卷 472-480页

作者： Jin-Yang Li Tian-Shuo Feng Ji Gao Xin-Xiang Yang Xiang-Cheng Li zhen-Hua deng Yong-Xiang Xia zheng-Shan Wu Hepatobiliary Center the First Affiliated Hospital of Nanjing Medical UniversityNanjing 210029China Key Laboratory of Liver Transplantation Chinese Academy of Medical SciencesNanjing 210029China NHC Key Laboratory of Living Donor Liver Transplantation Nanjing Medical UniversityNanjing 210029China

Background: Regulatory B cells(Bregs) is an indispensable element in inducing immune tolerance after liver transplantation. As one of the microRNAs(miRNAs), mi R-29a-3p also inhibits translation by degrading the target mRNA, and yet the relationship between Bregs and mi R-29a-3p has not yet been fully explored. This study aimed to investigate the impact of miR-29a-3p on the regulation of differentiation and immunosuppressive functions of memory Bregs(m Bregs) and ultimately provide potentially effective therapies in inducing immune tolerance after liver transplantation. Methods: Flow cytometry was employed to determine the levels of Bregs in peripheral blood mononuclear cells. TaqMan low-density array miRNA assays were used to identify the expression of different miRNAs, electroporation transfection was used to induce mi R-29a-3p overexpression and knockdown, and dual luciferase reporter assay was used to verify the target gene of miR-29a-3p. Results: In patients experiencing acute rejection after liver transplantation, the proportions and immunosuppressive function of m Bregs in the circulating blood were significantly impaired. mi R-29a-3p was found to be a regulator of m Bregs differentiation. Inhibition of miR-29a-3p, which targeted nuclear factor of activated T cells 5(NFAT5), resulted in a conspicuous boost in the differentiation and immunosuppressive function of m Bregs. The inhibition of mi R-29a-3p in CD19~+ B cells was capable of raising the expression levels of NFAT5, thereby promoting B cells to differentiate into m Bregs. In addition, the observed enhancement of differentiation and immunosuppressive function of m Bregs upon mi R-29a-3p inhibition was abolished by the knockdown of NFAT5 in B cells. Conclusions: mi R-29a-3p was found to be a crucial regulator for m Bregs differentiation and immunosuppressive function. Silencing mi R-29a-3p could be a potentially effective therapeutic strategy for inducing immune tolerance after liver transplantation.

关键词： Regulatory B cells miR-29a-3p NFAT5 Liver transplantation

Reanalysis of energy band structure in the type-II quantum wells

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Chinese Physics B 2024年第6期33卷 75-78页

作者：李欣欣邓震江洋杜春花贾海强王文新陈弘 Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Center of Materials and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China The Yangtze River Delta Physics Research Center Liyang 213000China Songshan Lake Materials Laboratory Dongguan 523808China

Band structure analysis holds significant importance for understanding the optoelectronic characteristics of semiconductor structures and exploring their potential applications in practice. For quantum well structures, the energy of carriers in the well splits into discrete energy levels due to the confinement of barriers in the growth direction. However, the discrete energy levels obtained at a fixed wave vector cannot accurately reflect the actual energy band structure. In this work, the band structure of the type-II quantum wells is reanalyzed. When the wave vectors of the entire Brillouin region(corresponding to the growth direction) are taken into account, the quantized energy levels of the carriers in the well are replaced by subbands with certain energy distributions. This new understanding of the energy bands of low-dimensional structures not only helps us to have a deeper cognition of the structure, but also may overturn many viewpoints in traditional band theories and serve as supplementary to the band theory of low-dimensional systems.

关键词： energy band structure type-II quantum wells low-dimensional semiconductors

本科层次职业教育专业设置:现状、反思与建议——基于2019~2022年数据的分析

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天津中德应用技术大学学报 2024年第3期 21-30页

作者：邓振华广东工商职业技术大学广东肇庆526020

稳步发展职业本科教育包括规模和质量的双稳步,专业是规模和质量的载体,因此国家本科层次职业教育专业设置的合理性直接关系到职业教育改革工作的成功与否。经过四年的实践,目前32所本科层次职业教育学校共设有616个专业点,课题组以此... 详细信息

稳步发展职业本科教育包括规模和质量的双稳步,专业是规模和质量的载体,因此国家本科层次职业教育专业设置的合理性直接关系到职业教育改革工作的成功与否。经过四年的实践,目前32所本科层次职业教育学校共设有616个专业点,课题组以此为研究对象,采取定性和定量研究方法,从学校属性、学科门类、专业大类、专业类、专业——产业吻合度等方面对专业设置进行了梳理和反思,并结合实际国家、省级和校级三个层面对专业设置提出相应的意见和建议,以期能够更好地促进本科层次职业教育工作的开展。

关键词：本科层次职业教育职业技术大学专业设置

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航空突变截面环件近净轧制环坯设计方法

锻压技术 2024年第8期49卷 94-102页

作者：吴荣文邓针邓加东顾鹏郑冬财中国航发贵州黎阳航空动力有限公司贵州贵阳550081 武汉理工大学汽车工程学院湖北武汉430070

为了提高航空突变截面环件轧制过程中环件截面轮廓的填充精度,提出了一种基于环件截面形状特征分割的环坯设计方法。通过理论分析给出了轧制环坯设计过程中几何尺寸的计算方法和修正方案。通过ABAQUS有限元模拟软件,分析了突变截面环件... 详细信息

为了提高航空突变截面环件轧制过程中环件截面轮廓的填充精度,提出了一种基于环件截面形状特征分割的环坯设计方法。通过理论分析给出了轧制环坯设计过程中几何尺寸的计算方法和修正方案。通过ABAQUS有限元模拟软件,分析了突变截面环件的轧制过程,其模拟结果显示,基于环件截面形状特征分割设计的轧制环坯具有很好的填充效果,数值模拟结果还揭示了突变截面环件轧制成形的金属流动规律,阐明了突变截面环件轧制几何尺寸的演变规律。此外,还开展了轧制实验,结果表明:该环坯设计方法可以精确地成形出相应的突变截面环件的截面轮廓,其最大的尺寸相对误差不超过0.72%。

关键词：突变截面环件轧制成形环坯设计截面轮廓填充效果

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降质感知的小波变换水下图像增强网络

计算机系统应用 2024年第9期33卷 201-207页

作者：刘祎恒邓箴宁夏大学信息工程学院银川750021

针对现有水下图像增强算法不能感知降质,易丢失细节,无法有效纠正色偏等问题,提出了降质感知的小波变换水下图像增强网络模型.该模型主要包含对比学习的降质表征提取网络和多级小波变换的水下图像增强网络.首先,降质表征提取网络利用编... 详细信息

针对现有水下图像增强算法不能感知降质,易丢失细节,无法有效纠正色偏等问题,提出了降质感知的小波变换水下图像增强网络模型.该模型主要包含对比学习的降质表征提取网络和多级小波变换的水下图像增强网络.首先,降质表征提取网络利用编码器和对比学习的方法,从每张水下图像中提取特有的降质表征;随后,以多级小波变换增强算法为指导思想,构建三级小波变换模块,旨在从频率域上实施多尺度的细节和颜色增强;最后,构建基于三级小波变换模块的多级小波变换增强网络,并将提取的降质表征引入到该网络中,以便在感知降质信息后,更好地实施多级小波变换增强.实验结果表明,本算法较已有算法具有更强的颜色校正,细节增强能力,增强结果在结构相似性指标上提升16%,峰值信噪比指标上提升9%,水下图像质量指标上提升14%,能用于水下图像增强任务.

关键词：图像增强小波变换降质感知深度学习

基于FAERS数据库的喹硫平不良事件信号挖掘与分析

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中南药学 2024年第8期22卷 2248-2254页

作者：邓珍珍冯灿汪江林中南大学湘雅三医院药学部长沙410013 中南大学湘雅药学院长沙410013

目的基于美国食品药品监督管理局(FDA)不良事件报告系统(FAERS)数据库挖掘喹硫平的药物不良事件(ADE)信号,为该药的临床安全使用提供参考。方法检索FAERS数据库中2004年至2023年共79个季度关于喹硫平的不良反应报告,同时采用报告比值比... 详细信息

目的基于美国食品药品监督管理局(FDA)不良事件报告系统(FAERS)数据库挖掘喹硫平的药物不良事件(ADE)信号,为该药的临床安全使用提供参考。方法检索FAERS数据库中2004年至2023年共79个季度关于喹硫平的不良反应报告,同时采用报告比值比法、比例报告比值法、贝叶斯置信区间神经网络传播法、多重伽马-泊松收缩估计法,按药物不良事件术语集的首选术语(PT)和系统器官分类(SOC)对纳入的ADE报告进行分类并计算风险信号。结果共收集主要怀疑药物为喹硫平的ADE报告261725份,涉及的患者有68012例,其中以女性(37495份,55.13%)及老年患者(>65岁)(35312份,占51.9%)居多,报告国家以美国为主,结局多为其他严重后果、住院、死亡和危及患者生命。共挖掘出喹硫平阳性风险信号PT 713个,涉及SOC 27个,所得信号基本与药品说明书一致,其中报告数最多的ADE为糖尿病,且信号强度较高。报告数超过500例的ADE中,共挖掘47个阳性风险信号PT,其中横纹肌溶解为说明书中未收载的ADE。喹硫平引起ADE发生的时间不一,常在用药后30 d内或用药一年以上发生。结论临床在使用喹硫平时除应在全程关注药品说明书收录的ADE外,还应警惕说明书未提及的ADE,并且根据性别、年龄等制订个体化的用药监护方案。

关键词：喹硫平美国FDA不良事件报告系统药物不良事件发生时间

Learning synergies based in-hand manipulation with reward shaping

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CAAI Transactions on Intelligence Technology 2020年第3期5卷 141-149页

作者： zhen deng Jian Wei Zhang TAMS Group InformaticsUniversity of HamburgHamburg D-22527Germany

In-hand manipulation is a fundamental ability for multi-fingered robotic hands that interact with their *** to the high dimensionality of robotic hands and intermittent contact dynamics,effectively programming a robotic hand for in-hand manipulations is still a challenging *** address this challenge,this work employs deep reinforcement learning(DRL)algorithm to learn in-hand manipulations for multi-fingered robotic hands.A reward-shaping method is proposed to assist the learning of in-hand *** synergy of robotic hand postures is analysed to build a low-dimensional hand posture *** additional rewards are designed based on both the analysis of hand synergies and its learning *** two additional rewards cooperating with an extrinsic reward are used to assist the in-hand manipulation *** value functions are trained jointly with respect to their reward *** they cooperate to optimise a control policy for in-hand *** reward shaping not only improves the exploration efficiency of the DRL algorithm but also provides a way to incorporate domain *** performance of the proposed learning method is evaluated with object rotation *** results demonstrated that the proposed learning method enables multi-fingered robotic hands to learn in-hand manipulation effectively.

关键词： manipulation policy jointly

城市扩张、高铁网络对城市土地绿色利用效率的空间效应——理论分析及经验证据

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地理研究 2024年第10期43卷 2523-2540页

作者：章屹祯邓珍曹继章坤梁双波曹卫东安徽师范大学地理与旅游学院芜湖241002 安徽师范大学生命科学学院芜湖241000 华侨大学旅游学院泉州362021 中国科学院南京地理与湖泊研究所南京210008

土地是资源要素的重要载体,提升城市土地绿色利用效率(ULGUE),是实现“精明增长”的关键。在现象观察与理论构建的基础上,本研究以2008—2019年中国268个城市为研究单元,融合多源数据,结合ArcGIS分析、EBM-DEA模型和空间计量等模型,揭... 详细信息

土地是资源要素的重要载体,提升城市土地绿色利用效率(ULGUE),是实现“精明增长”的关键。在现象观察与理论构建的基础上,本研究以2008—2019年中国268个城市为研究单元,融合多源数据,结合ArcGIS分析、EBM-DEA模型和空间计量等模型,揭示城市扩张、高铁网络对ULGUE的空间效应。研究表明:①中国ULGUE具有一定的梯度分布和空间依赖特征,其核密度曲线整体右移,且峰值不断降低,土地资源“精细化”利用程度有所提升。②城市扩张与ULGUE存在显著的非线性关系,保持合理的城市扩张能显著提升ULGUE;高铁网络加快了资源优化配置,对ULGUE具有较强的正向空间效应。③从溢出效应来看,城市扩张显著提升了本地ULGUE,但对邻近城市则相反;高铁网络对本地ULGUE具有较强的正外部性,但也要警惕其“虹吸效应”对邻近城市造成负面影响。④从区域异质性来看,省会城市能通过城市扩张缓解城市运行压力,提升ULGUE;而非省会城市和中西部地区则要合理确定空间开发边界,实现“精明增长”。就中介效应而言,经济集聚充当城市扩张与ULGUE的中介角色,而高铁网络则通过促进产业结构升级效应提升ULGUE。当前,中国正处于城镇化和高铁网络发展的快速阶段,期望本研究为提升土地绿色利用的综合效能,促进区域高质量可持续发展提供支撑。

关键词：城市土地绿色利用效率时空演化空间效应高铁网络