检索结果-南通市图书馆

Highly ordered crystallization ofα-FAPbl_(3) films via homogeneous seeds for efficient perovskite solar cells

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第7期94卷 625-634页

作者： Guohui Luo Linfeng Zhang Liyun Guo Xiuhong Geng penghui Ren Yi Zhang Haihua hu Xiaoping Wu Lingbo Xu Ping Lin Haiyan He Xuegong Yu Peng Wang Can Cui Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina Zhejiang Provincial Key Laboratory of Fiber Materials and Manufacturing Technology Zhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina Hangzhou City University Hangzhou 310015ZhejiangChina Key Laboratory of Solar Energy Utilization and Energy Saving Technology of Zhejiang Province Zhejiang Baima Lake Laboratory Co.Ltd.Hangzhou 310012ZhejiangChina State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027ZhejiangChina

Formamidine lead triodide(FAPbI_(3))perovskites have become the most promising photovoltaic materials for perovskite solar cells with record power conversion efficiency(PcE).However,random nucleation,phase transition,and lattice defects are still the key challenges limiting the quality of FAPbI_(3)films.Previous studies show that the introduction or adding of seeds in the precursor is effective to promote the nucleation and crystallization of perovskite films.Nevertheless,the seed-assisted approach focuses on heterogeneous seeds or hetero-composites,which inevitably induce a lattice-mismatch,the genera-tion of strain or defects,and the phase segregation in the perovskite films.Herein,we first demonstrate that high-quality perovskite films are controllably prepared usingα-and δ-phases mixed FAPbI_(3) micro-crystal as the homogeneous seeds with the one-step antisolvent method.The partially dissolved seeds with suitable sizes improve the crystallinity of the perovskite flm with preferable orientation,improved carrier lifetime,and increased carrier mobility.More importantly,theα-phase-containing seeds promote the formation of α-phase FAPbI_(3) films,leading to the reduction of residual lattice strain and the suppres-sion of I-ion migration.Besides,the adding of dimethyl 2,6-pyridine dicarboxylate(DPD)into the pre-cursor further suppresses the generation of defects,contributing to the PCE of devices prepared in air ambient being significantly improved to 23.75%,among the highest PCEs for fully air-processed FAPbl_(3) solar cells.The unpackaged target devices possess a high stability,maintaining 80%of the initial PCE under simulated solar illumination exceeding 8o0 h.

关键词： Perovskite solar cells FAPbI_(3) Homogeneous seeds Strain Phase stability

Promoting interactions between cognitive science and large language models

在线全文

学校读者我要写书评

暂无评论

The Innovation 2024年第2期5卷 9-10页

作者： Youzhi Qu penghui Du Wenxin Che Chen Wei Chi Zhang Wanli Ouyang Yatao Bian Feiyang Xu Bin hu Kai Du Haiyan Wu Jia Liu Quanying Liu Department of Biomedical Engineering Southern University of Science and TechnologyShenzhen 518055China Shanghai AI Laboratory Shanghai 200232China Tencent AI Lab Shenzhen 518057China iFLYTEK AI Research Hefei 230088China School of Medical Technology Beijing Institute of TechnologyBeijing 100081China Institute for Artificial Intelligence Peking UniversityBeijing 100871China Centre for Cognitive and Brain Sciences and Department of Psychology University of MacaoMacao 999078China Department of Psychology Tsinghua UniversityBeijing 100084China

Large language models(LLMs)have made unprecedented progress,demonstrating human-like language proficiency and an extraordinary ability to encode complex knowledge.The emergence of high-level cognitive capabilities in LLMs,such as in-context learning and complex reasoning,suggests a path toward the realization of artificial general intelligence(AGI).However,we lack scientific theories and tools to assess and interpret such an emergence of the advanced intelligence of LLMs.Artificial intelligence(AI)has been extensively applied in various areas of fundamental science to accelerate scientific research.

关键词： cognitive such language

Piezoelectric nanofoams with the interlaced ultrathin graphene confining Zn–N–C dipoles for efficient piezocatalytic H_(2) evolution under low-frequency vibration

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第6期31卷 115-122,I0004页

作者： penghui hu Yan Xu Yanhua Lei Jie Yuan Rui Lei Rong hu Junkang Chen Difa Xu Shiying Zhang Ping Liu Xiangchao Zhang Xiaoqing Qiu Wenhui Feng These authors contributed equally to this work.a.hunan Province Key Laboratory of Applied Environmental Photocatalysis Changsha UniversityChangsha 410022HunanChina College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116FujianChina hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds and Application Department of Chemistry and Life ScienceXiangnan UniversityChenzhou 423000HunanChina

Unique nanofoams consisting of interweaved ultrathin graphene confining Zn–N–C dipoles (ZnNG) are constructed via calcination of Zn-coordinated precursor.Due to the introduction of local polar Zn–N–C configurations,with hypersensitivity for mechanical stress,the piezoelectricity is created on the nonpiezoelectric graphene,and the hierarchical ZnNG exhibits obvious piezocatalytic activity of water splitting for H_(2) production even under mild agitation.The corresponding rate of H_(2) production is about 14.65 μmol g^(-1)h^(-1).It triggers a breakthrough in piezocatalytic H_(2) evolution under low-frequency vibration,and takes a significant step forward for piezocatalysis towards practical applications.Furthermore,the presented concept of confining atomic polar configuration for engineering piezoelectricity would open up new horizon for constructing new-type piezoelectrics based on both piezoelectric and nonpiezoelectric materials.

关键词： Piezocatalysis Water splitting for H_(2)production Low-frequency vibration Ultrathin graphene confining Zn–N–C dipoles

Serine metabolism orchestrates macrophage polarization by regulating the IGF1–p38 axis

在线全文

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2022年第11期19卷 1263-1278页

作者： Xiao Shan penghui hu Lina Ni Long Shen Yanan Zhang Zemin Ji Yan Cui Meihua Guo Haoan Wang Liyuan Ran Kun Yang Ting Wang Lei Wang Bin Chen Zhi Yao Vingjie Wu Qiujing Yu Tianjin Institute of Immunology Key Laboratory of Immune Microenvironment and Disease of the Ministry of EducationThe Province and Ministry Co-sponsored Collaborative Innovation Center for Medical EpigeneticsTianjin Key Laboratory of Inflammation BiologyDepartment of ImmunologySchool of Basic Medical SciencesTianjin Medical University Division of Infectious Disease Second Hospital of Tianjin Medical UniversityTianjin300070China Institute for Genome Engineered Animal Models of human Diseases National Center of Genetically Engineered Animal Models for International ResearchDalian Medical UniversityDalian116044LiaoningChina Shandong Provincial Hospital School of Laboratory Animal and Shandong Laboratory Animal CenterScience and Technology Innovation CenterShandong First Medical University and Shandong Academy of Medical SciencesJinan250021ShandongChina The Province and Ministry Co-sponsored Collaborative Innovation Center for Medical Epigenetics Department of Pharmacology and Tianjin Key Laboratory of Inflammation BiologySchool of Basic Medical SciencesTianjin Medical UniversityTianjin300070China Tianjin Institute of Immunology Key Laboratory of Immune Microenvironment and Disease of the Ministry of EducationDepartment of ImmunologySchool of Basic Medical SciencesTianjin Medical UniversityTianjinChina Department of Molecular Pathobiology New York University College of DentistryNew YorkNY10010USA

Serine metabolism is reportedly involved in immune cell functions, but whether and how serine metabolism regulates macrophage polarization remain largely unknown. Here, we show that suppressing serine metabolism, either by inhibiting the activity of the key enzyme phosphoglycerate dehydrogenase in the serine biosynthesis pathway or by exogenous serine and glycine restriction, robustly enhances the polarization of interferon-γ-activated macrophages (M(IFN-γ)) but suppresses that of interleukin-4-activated macrophages (M(IL-4)) both in vitro and in vivo. Mechanistically, serine metabolism deficiency increases the expression of IGF1 by reducing the promoter abundance of S-adenosyl methionine-dependent histone H3 lysine 27 trimethylation. IGF1 then activates the p38-dependent JAK–STAT1 axis to promote M(IFN-γ) polarization and suppress STAT6-mediated M(IL-4) activation. This study reveals a new mechanism by which serine metabolism orchestrates macrophage polarization and suggests the manipulation of serine metabolism as a therapeutic strategy for macrophage-mediated immune diseases.

关键词： Serine metabolism PHGDH Macrophage polarization SAM IGF1 p38

Enhanced bed load sediment transport by unsteady flows in a degrading channel

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2018年第3期33卷 327-339页

作者： Zhijing Li Honglu Qian Zhixian Cao huaihan Liu Gareth Pender penghui hu State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Changjiang River Scientific Research Institute Yangtze River Waterway Bureau School of Energy Geoscience Infrastructure and Society Heriot-Watt University

Laboratory flume experiments were done to investigate bed load sediment transport by both steady and unsteady flows in a degrading channel. The bed, respectively composed of uniform sand, uniform gravel,or sand-gravel mixtures, always undergoes bulk degradation. It is found that both uniform and nonuniform bed load transport is enhanced greatly by unsteady flows as compared to their volumeequivalent steady flows. This enhancement effect is evaluated by means of an enhancement factor, which is shown to be larger with a coarser bed and lower discharges. Also, the fractional transport rates of gravel and sand in non-uniform sand-gravel mixtures are compared with their uniform counterparts under both steady and unsteady flows. The sand is found to be able to greatly promote the transport of gravel, whilst the gravel considerably hinders the transport of sand. Particularly, the promoting and hindering impacts are more pronounced at lower discharges and tend to be weakened by flow unsteadiness.

关键词： Bed load Gravel Sand Unsteady flow Enhancement effect

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

一种新型早强高强灌浆料的制备及性能研究

材料导报 2024年第S1期38卷 174-177页

作者：徐铜鑫胡鹏辉郑超周振兴中钢集团郑州金属制品研究院股份有限公司郑州450000

灌浆料作为一种常见的建筑材料,被广泛应用于建筑工程中,主要用于工程部位的支撑和固定。然而,传统的灌浆料存在一些问题,比如流动性易损失、强度发展缓慢以及后期强度不足等特点。本文通过研究不同水灰比、外加剂掺量以及矿物掺合料种... 详细信息

灌浆料作为一种常见的建筑材料,被广泛应用于建筑工程中,主要用于工程部位的支撑和固定。然而,传统的灌浆料存在一些问题,比如流动性易损失、强度发展缓慢以及后期强度不足等特点。本文通过研究不同水灰比、外加剂掺量以及矿物掺合料种类对灌浆料早强、高强性能的影响,并利用化学分析、XRD和SEM等方法对灌浆料进行检测分析。结果表明,灌浆料的水灰比在0.28、早强剂的掺量为0.1%以及硅灰和矿粉的掺量为5%、10%时,灌浆料的8 h、1 d、28 d抗折强度分别为11.5 MPa、14.4 MPa、16.8 MPa,抗压强度分别达到49.8 MPa、68.2 MPa、93.5 MPa,满足灌浆料早强、高强的性能要求。

关键词：水灰比矿物掺合料外加剂抗压强度抗折强度

在线全文

学校读者我要写书评

暂无评论

钛酸铝-堇青石复相陶瓷的制备和性能研究

硅酸盐通报 2024年第6期43卷 2241-2249页

作者：黄学辉陈文臻邓鹏辉胡祥奥武汉理工大学材料科学与工程学院武汉430070

本研究以MgO为稳定剂,以堇青石为增强剂,通过固相反应法成功制备了钛酸铝-堇青石复相陶瓷,并系统研究了MgO和堇青石以及烧结温度对复相陶瓷物相组成、显微结构、烧结性能和热力学性能的影响。结果表明,MgO的引入促进了钛酸铝晶粒的合成... 详细信息

本研究以MgO为稳定剂,以堇青石为增强剂,通过固相反应法成功制备了钛酸铝-堇青石复相陶瓷,并系统研究了MgO和堇青石以及烧结温度对复相陶瓷物相组成、显微结构、烧结性能和热力学性能的影响。结果表明,MgO的引入促进了钛酸铝晶粒的合成和长大,降低了烧结温度,并通过形成Mg_(x)Al_(2(1-x))Ti_((1+x))O_(5)固溶体提高了钛酸铝陶瓷的热稳定性。堇青石在烧结致密化和力学性能方面起着重要作用。在1325℃烧结条件下,MgO含量为8.00%、堇青石含量为15.00%的样品表现出良好的性能,体积密度为3.49 g/cm^(3),气孔率仅为2.2%,抗弯强度达到66.8 MPa,热膨胀系数为2.6×10^(-6)K^(-1)(室温至1000℃)。研究结果为设计和制备具备优异综合性能的高温结构陶瓷提供了新的思路。

关键词：钛酸铝堇青石复相陶瓷烧结温度抗弯强度热膨胀

基于FFRLS和ASR-UKF滤波算法的锂电池SOC估计

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

电源技术 2024年第2期48卷 299-305页

作者：邓丹刘胜永王顺利刘鹏辉胡聪广西科技大学自动化学院广西柳州545006 西南科技大学信息工程学院四川绵阳621010 桂林电子科技大学广西自动检测技术与仪器重点实验室广西桂林541004

锂电池在工作过程中,其内部参数易受多种因素影响,为提高锂电池在复杂环境下荷电状态(SOC)估计精度,以二阶戴维宁(Thevenin)等效模型为基础,结合遗忘因子递推最小二乘法(FFRLS)对模型参数进行在线辨识。针对传统卡尔曼滤波算法高度非线... 详细信息

锂电池在工作过程中,其内部参数易受多种因素影响,为提高锂电池在复杂环境下荷电状态(SOC)估计精度,以二阶戴维宁(Thevenin)等效模型为基础,结合遗忘因子递推最小二乘法(FFRLS)对模型参数进行在线辨识。针对传统卡尔曼滤波算法高度非线性及系统噪声不确定性等缺点,提出了一种自适应平方根无迹卡尔曼滤波(ASR-UKF)算法,该算法利用平方根算法处理均值和协方差,确保了状态协方差的半正定性和稳定性,并引入自适应滤波算法对噪声进行实时修正,消除了系统时变噪声影响。结果表明,FFRLS能有效解决数据饱和及算法矩阵计算量大的问题,等效模型精度高达98%。在混合动力脉冲特性(HPPC)测试和北京公交动态测试工况(BBDST)下,ASR-UKF算法SOC估计最大误差分别为3.264%和0.572%,具备更好的跟踪效果,验证了改进算法良好的收敛性与自适应性。

关键词：荷电状态二阶Thevenin模型遗忘因子递推最小二乘法自适应平方根无迹卡尔曼滤波算法

有氧运动对糖尿病大鼠学习记忆功能、海马突触可塑性及脂联素信号通路的影响

在线全文

学校读者我要写书评

暂无评论

中华老年医学杂志 2024年第3期43卷 348-353页

作者：田清华刘霞邓鹏辉季威李建平胡润东湖南师范大学体育学院体适能与运动康复湖南省重点实验室长沙410012

目的探讨有氧运动对糖尿病大鼠学习记忆功能、海马突触可塑性及脂联素信号通路的影响。方法6周龄雄性SD大鼠随机分为空白对照组(NC组)和高脂饮食组,以5周的高脂饮食联合腹腔灌注低剂量链脲佐菌素(STZ)喂养高脂饮食组大鼠,诱导糖尿病大... 详细信息

目的探讨有氧运动对糖尿病大鼠学习记忆功能、海马突触可塑性及脂联素信号通路的影响。方法6周龄雄性SD大鼠随机分为空白对照组(NC组)和高脂饮食组,以5周的高脂饮食联合腹腔灌注低剂量链脲佐菌素(STZ)喂养高脂饮食组大鼠,诱导糖尿病大鼠模型,造模成功后分为糖尿病组(DC组)和糖尿病有氧运动组(DM组)。并对DM组大鼠实施了8周有氧跑台锻炼。8周后,用Morris水迷宫试验测定各组大鼠的学习记忆功能,血清相关指标,用高尔基染色观察分析海马区突触的变化,用蛋白免疫印迹法(Western blot)检测大鼠海马组织脂联素、腺苷酸激活蛋白激酶(AMPK)、葡萄糖转运蛋白4(GLUT4)及突触可塑性相关蛋白(SYN)、突触后致密物(PSD-95)的蛋白质表达水平。结果糖尿病大鼠血清空腹血糖(FBG)、糖化血红蛋白(HBA1c)在8周有氧运动后降低(F=69.248、7.017,均P<0.01),血清脂联素和胰岛素在8周有氧运动后升高(F=14.315、6.740,均P<0.05)。海马高尔基染色海马CA3区树突棘数量(F=9.307,P=0.001)、树突棘密度(F=6.734,P=0.008)增加。糖尿病大鼠逃避潜伏期在8周有氧运动后降低(F=13.934,P<0.01),穿越平台次数增加(F=5.864,P=0.023)。糖尿病大鼠海马PSD-95、SYN、脂联素、p-AMPK、GLUT4蛋白表达水在平8周有氧运动后显著增加(F=5.415、15.137、9.687、9.298、27.761,均P<0.05)。结论8周有氧运动可改善糖尿病大鼠的学习记忆功能,其机制可能与运动诱导大鼠海马脂联素/AMPK/GLUT4信号通路的激活,导致其海马突触可塑性增强有关。

关键词：糖尿病脂联素学习记忆功能有氧运动突触可塑性