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Lead-free hybrid two-dimensional double perovskite with switchable dielectric phase transition

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Chinese Chemical Letters 2024年第6期35卷 176-179页

作者： Tian Yang Yi Liu Lina Hua Yaoyao Chen Wuqian Guo Haojie Xu xi Zeng Changhao Gao Wenjing Li Junhua Luo Zhihua Sun College of Chemistry Fuzhou UniversityFuzhou 350108China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Molecular dielectric switches constitute a type of intelligent materials that are highly coveted for their distinctive advantages of switchable dielectric responses,lightweight,and mechanical ***(2D)hybrid perovskites have demonstrated excellent promise for assembling dielectric switches,in which the dynamic motions of organic moieties afford driving force to trigger switchable dielectric phase ***,we successfully assembled a new lead-free hybrid double perovskite,(CHA)4Cu bi Br8(1,CHA=cyclohexylammonium),adopting a typical 2D structural motif,which shows dielectric anisotropy and bistable behaviors during the reversible phase transition near T_(c)=378 K(the Curie temperature).That is,its dielectric constants could be switched and tuned between high-dielectric and low-dielectric *** analyses reveal that the ordered-disordered transformation of the organic CHA+moiety and distortion of inorganic framework account for its phase *** result will stimulate further exploration of molecular dielectric switches in this 2D environmentally friendly family.

关键词： Dielectric switch Lead-free Double perovskite Phase transition Symmetry breaking

Trilogy of drug repurposing for developing cancer and chemotherapy-induced heart failure co-therapy agent

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Acta Pharmaceutica Sinica B 2024年第2期14卷 729-750页

作者： xin Chen xianggang Mu Lele Ding xi Wang Fei Mao Jinlian Wei Qian Liu Yixiang Xu Shuaishuai Ni Lijun Jia Jian Li State Key Laboratory of bioreactor Engineering Shanghai Frontiers Science Center of Optogenetic Techniques for Cell MetabolismFrontiers Science Center for Materiobiology and Dynamic ChemistryShanghai Key Laboratory of New Drug DesignSchool of PharmacyEast China University of Science and TechnologyShanghai 200237China Cancer Institute Longhua HospitalShanghai University of Traditional Chinese MedicineShanghai 200032China College of Pharmacy Jinan UniversityGuangzhou 510632China

Chemotherapy-induced complications,particularly lethal cardiovascular diseases,pose significant challenges for cancer *** intertwined adverse effects,brought by cancer and its complication,further complicate anticancer therapy and lead to diminished clinical *** supplementation of cardioprotective agents falls short in addressing these *** bifunctional co-therapy agents provided another potential solution to consolidate the chemotherapy and reduce cardiac events *** repurposing was naturally endowed with co-therapeutic potential of two indications,implying a unique chance in the development of bi-functional ***,we further proposed a novel“trilogy of drug repurposing”strategy that comprises function-based,targetfocused,and scaffold-driven repurposing approaches,aiming to systematically elucidate the advantages of repurposed drugs in rationally developing bi-functional *** function-based repurposing,a cardioprotective agent,carvedilol(CAR),was identified as a potential neddylation inhibitor to suppress lung cancer *** target-focused SAR studies and scaffold-driven drug design,we synthesized 44 CAR derivatives to achieve a balance between anticancer and ***,optimal derivative 43 displayed promising bi-functional effects,especially in various self-established heart failure mice models with and without ***,the present study validated the practicability of the“trilogy of drug repurposing”strategy in the development of bi-functional cotherapy agents.

关键词： Anticancer Heartfailure Complication Drug repurposing bi-functional drug

A high-entropy spinel ceramic oxide as the cathode for proton-conducting solid oxide fuel cells

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Journal of Advanced Ceramics 2022年第5期11卷 794-804页

作者： Yangsen XU xi XU Lei bi School of Resource Environment and Safety Engineering University of South ChinaHengyang 421001China Department of Materials Imperial College London SW72BPUK

A high-entropy ceramic oxide is used as the cathode for the first time for proton-conducting solid oxide fuel cells(H-SOFCs).The Fe_(0.6)Mn_(0.6)Co_(0.6)Ni_(0.6)Cr_(0.6)O_(4)(FMCNC)high-entropy spinel oxide has been successfully prepared,and the in situ chemical stability test demonstrates that the FMCNC material has good stability against CO_(2).The first-principles calculation indicates that the high-entropy structure enhances the properties of the FMCNC material that surpasses their individual components,leading to lower O_(2)adsorption energy for FMCNC than that for the individual *** HSOFC using the FMCNC cathode reaches an encouraging peak power density(PPD)of 1052 mW·cm^(-2)at 700℃,which is higher than those of the H-SOFCs reported *** comparison was made between the high-entropy FMCNC cathode and the traditional Mn_(1.6)Cu_(1.4)O_(4)(MCO)spinel cathode without the high-entropy structure,revealing that the formation of the high-entropy material allows the enhanced protonation ability as well as the movement of the O p-band center closer to the Fermi level,thus improving the cathode catalytic *** a result,the high-entropy FMCNC has a much-decreased polarization resistance of 0.057Ω·cm^(2)at 700℃,which is half of that for the traditional MCO spinel cathode without the high-entropy *** excellent performance of the FMCNC cell indicates that the high-entropy design makes a new life for the spinel oxide as the cathode for HSOFCs,offering a novel and promising route for the development of high-performance materials for H-SOFCs.

关键词： proton-conducting oxides high-entropy oxides cathode solid oxide fuel cells(SOFCs)

平钢板-UHPC组合桥面板纵向抗负弯性能试验研究

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工程力学 2024年第3期41卷 91-105页

作者：李传习肖和育贺龙飞施宇冯浩轩裴必达长沙理工大学桥梁工程安全控制教育部重点实验室湖南长沙410114 长沙理工大学土木工程学院湖南长沙410114

某大桥次边跨及中跨主梁为钢-UHPC组合梁,钢-UHPC组合梁的桥面板首次采用一种通过PBL剪力键将8 mm平钢板与15 cm的UHPC层连接起来的新型组合桥面体系。为了探究该桥新型钢-UHPC组合桥面板抗负弯矩性能与安全性,完成了2块足尺模型的静力... 详细信息

某大桥次边跨及中跨主梁为钢-UHPC组合梁,钢-UHPC组合梁的桥面板首次采用一种通过PBL剪力键将8 mm平钢板与15 cm的UHPC层连接起来的新型组合桥面体系。为了探究该桥新型钢-UHPC组合桥面板抗负弯矩性能与安全性,完成了2块足尺模型的静力性能试验,进行了桥梁整体受力和桥面板局部受力计算,以及桥面板抗负弯矩极限承载力构成分析。结果表明:UHPC名义开裂强度达8.90 MPa以上,其值远大于实桥荷载作用下UHPC层上缘的纵桥向最大拉应力,组合桥面板负弯矩抗裂性能良好,能满足工程需求;组合桥面板抗负弯承载力的计算,UHPC受拉本构宜采用三折线模型,抗负弯承载力简化计算的UHPC受拉区等效均布应力折减系数可取0.76,抗负弯承载力状态的受压钢板受力仍处于线弹性阶段,抗负弯破坏模式与抗正弯明显不同,为受拉钢筋拉断;PBL剪力键能保证了钢板与UHPC板整体共同受力;组合桥面板在负弯矩作用下的延性良好,裂宽增长缓慢,UHPC的名义极限强度达名义开裂强度的4.1倍以上,到达极限荷载后,组合板承载力没有明显下降。

关键词：平钢板-UHPC组合桥面板纵向受弯有限元足尺模型试验界面滑移 UHPC特征强度极限承载力构成

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Light-induced stepped thermal relaxation in a Hofmann-type metal-organic framework

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Science China Chemistry 2024年第6期67卷 1983-1989页

作者： Wen Cui Wei-Wei Wu Ze-Yu Ruan Yan-Cong Chen Guang-Jun Zeng Guan-xi Chen Si-Guo Wu Zhao-Ping Ni Ming-Liang Tong Key Laboratory of bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistryInstitute of Green Chemistry and Molecular EngineeringGuangdong Basic Research Center of Excellence for Functional Molecular EngineeringSun Yat-sen UniversityGuangzhou510275China

Spin-crossover(SCO)materials with light-induced multistability have potential applications in multi-addressable opto-magnetic memory devices and multiple ***,we reported a three-dimensional Hofmann-type metal-organic framework(MOF)[Fe(bpy){Pt(CN)_(4)}]·coumarin(1·coumarin,bpy=4,4′-bipyridine),which exhibits an incomplete and hysteretic SCO *** importantly,the light-induced stepped thermal relaxation(LISTR)with obvious magnetic plateau for a hidden intermediate spin state is firstly *** hidden spin state is also observed for the first time in the thermal relaxation after light-assisted spin state annealing(LASSA).Meanwhile,an extremely rare bi-directional light-induced excited spin-state trapping(LIESST)with the highest reverse-LIESST temperature is ***,five spin states can be captured in 1·coumarin and the tristability can be modulated below 102 K through the excitation-relaxation ***,the light-and temperatureinduced multistability provides a new strategy for developing multistable materials.

关键词： light magnetic multistability iron metal-organic framework spin-crossover

基于DFD-DBSCAN的高速列车电池组多故障诊断方法

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铁道科学与工程学报 2024年第7期21卷 2980-2988页

作者：向超群席振左明洁毕福亮成庶于天剑中南大学交通运输学院湖南长沙410075 中车长春轨道客车股份有限公司吉林长春130062

高速列车电池作为备用电源,被广泛应用于辅助供电系统以维持高速列车控制系统的正常运转,其可靠性涉及行车安全。列车频繁起停、频繁加减速以及震动等多种复杂运行环境易导致电池单体故障和连接故障。为了保证高速列车的安全运行,高速... 详细信息

高速列车电池作为备用电源,被广泛应用于辅助供电系统以维持高速列车控制系统的正常运转,其可靠性涉及行车安全。列车频繁起停、频繁加减速以及震动等多种复杂运行环境易导致电池单体故障和连接故障。为了保证高速列车的安全运行,高速列车电池组的状态检测与多故障诊断研究备受关注。目前,针对高速列车电池组的多故障诊断方法的研究尚属空白,提出一种基于改进离散弗雷歇距离(Discrete Fréchet Distance, DFD)和自适应密度聚类(Density-Based Spatial Clustering of Applications with Noise, DBSCAN)的高速列车电池组的实时多故障诊断方法,以准确识别电池组的连接故障和单体故障。以高速列车电池作为研究对象,通过设计适用于高速列车电池组的电压交叉测量方法,使得电池电压和连接板电压与不同的电压传感器相关联,并通过DFD算法对电池组的故障特征进行提取,将电压偏移率与DFD共同作为故障诊断模型的参数输入以提高算法的鲁棒性与可靠性,接着引入DBSCAN算法自动对故障诊断并定位。为了保证算法的实时性,利用基于滑动窗口的遗忘机制实时地对采样数据进行诊断。通过实验对所提出的方法进行验证,结果表明该方法可及时有效地诊断电池组的单体故障与连接故障并准确定位,弥补了高速列车电池组多故障诊断方法研究的缺失,对提高轨道列车的行车安全具有工程实用意义。

关键词：高速列车电池组故障诊断弗雷歇距离 DBSCAN算法

Wear-resistant Ag-MAX phase 3D interpenetrating-phase composites:Processing,structure,and properties

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Nano Research 2024年第2期17卷 806-819页

作者： Yu Guo xi xie Zengqian Liu Longchao Zhuo Jian Zhang Shaogang Wang Qiqiang Duan Qing Jia Dake Xu Weihai Xue Deli Duan Filippo Berto Zhefeng Zhang Rui Yang Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China Electrobiomaterials Institute Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)Northeastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Department of Chemical Engineering Materials and EnvironmentSapienza University of RomeRoma 00185Italy

Electrical contact materials are generally Ag-or Cu-based composites and play a critical role in ensuring the reliability and efficiency of electrical equipments and electronic *** MAX(M is an early transition metal,A is an element from III or IV main groups,and X is carbon or/and nitrogen)phase ceramics display a unique combination of properties and may serve as an ideal reinforcement phase for electrical contact *** biological materials evolved in nature generally exhibit three-dimensional(3D)interpenetrating-phase architectures,which may offer useful inspiration for the architectural design of electrical contact ***,a series of bi-continuous Ag-Ti_(3)SiC_(2) MAX phase composites with high ceramic contents exceeding 50 vol.%and having micron-and ultrafine-scaled 3D interpenetrating-phase architectures,wherein both constituents were continuous and mutually interspersed,were exploited by pressureless infiltration of Ag melt into partially sintered Ti_(3)SiC_(2) *** mechanical and electrical properties as well as the friction and wear performance of the composites were investigated and revealed to be closely dependent on the ceramic contents and characteristic structural *** composites exhibited a good combination of properties with high hardness over 2.3 GPa,high flexural strength exceeding 530 MPa,decent fracture toughness over 10 MPa·m^(1/2),and good wear resistance with low wear rate at an order of 10^(-5)mm^(3)/(N·m),which were much superior compared to the counterparts made by powder metallurgy *** particular,the hardness,electrical conductivity,strength,and fracture toughness of the composites demonstrated a simultaneous improvement as the structure was refined from micron-to ultrafine-scales at equivalent ceramic *** good combination of properties along with the facile processing route makes the Ag-Ti_(3)SiC_(2)3D interpenetrating-phase composites appealing for electrical contact applicatio

关键词： three-dimensional(3D)interpenetrating-phase architecture Ag-MAX(M=early transition metal A=element from III or IV main groups and X=carbon or/and nitrogen)phase composites melt infiltration electrical contact materials mechanical

上覆软弱路基加固对既有地铁隧道沉降的影响规律

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科学技术与工程 2024年第7期24卷 2947-2955页

作者：卢华喜刘甦宇罗青峰吴必涛华东交通大学土木建筑学院南昌330013 华东交通大学轨道交通基础设施性能监测与保障国家重点实验室南昌330013 南昌理工学院建筑工程学院南昌330044

为研究道路施工引起下方既有地铁隧道的沉降问题,在地铁隧道上方斜穿施工道路的基础上,进行了现场隧道沉降变形实测研究,分析了道路在路基注浆加固、路床和路面结构层施工阶段中地铁隧道的沉降曲线。建立地铁隧道-土体-道路模型对道路... 详细信息

为研究道路施工引起下方既有地铁隧道的沉降问题,在地铁隧道上方斜穿施工道路的基础上,进行了现场隧道沉降变形实测研究,分析了道路在路基注浆加固、路床和路面结构层施工阶段中地铁隧道的沉降曲线。建立地铁隧道-土体-道路模型对道路施工的注浆加固过程及路床和路面结构层施工进行模拟,通过比较地铁隧道沉降计算结果与现场实测值,验证了该精细化模型的准确性。基于此,分析了路床和路面结构层总施工厚度、道路土体性质、隧道下卧土层、隧道衬砌强度等关键参数对地铁隧道的沉降影响规律。结果表明:地铁隧道的沉降值与施工厚度呈正相关关系;道路的存在对隧道的沉降影响越小,其弹性模量和泊松比对地铁隧道沉降几乎没有影响;卧土层的弹性模量越大,土层越不易变形,且地铁隧道沉降越小;衬砌弹性模量增大对地铁隧道沉降影响反而越小。

关键词：道路施工地铁隧道沉降施工厚度土体性质衬砌强度

鄂尔多斯盆地悦乐地区长6段储层特征及主控因素分析

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成都理工大学学报（自然科学版） 2024年第4期51卷 531-542,560页

作者：张慧芳魏钦廉陈曦毕岭魏雪珂西安石油大学地球科学与工程学院西安710065 陕西省油气成藏地质学重点实验室西安710065 延长油田股份有限公司定边采油厂陕西定边717111

为明确鄂尔多斯盆地悦乐地区三叠系延长组长6段储层发育特征及控制因素,以悦乐地区长6段砂岩储层为研究对象,结合岩心资料、薄片鉴定、扫描电镜、高压压汞与地球物理测井解释等技术方法,从岩石学特征、物性特征及孔隙结构特征多个方面,... 详细信息

为明确鄂尔多斯盆地悦乐地区三叠系延长组长6段储层发育特征及控制因素,以悦乐地区长6段砂岩储层为研究对象,结合岩心资料、薄片鉴定、扫描电镜、高压压汞与地球物理测井解释等技术方法,从岩石学特征、物性特征及孔隙结构特征多个方面,探讨了沉积作用和成岩作用在储层储集性能方面的重要意义。结果表明:悦乐地区长6段岩性以岩屑长石砂岩和长石岩屑砂岩为主,孔隙类型主要以粒间孔和长石溶孔为主。悦乐地区长6段孔隙度均值为9.27%;渗透率均值为0.142×10^(-3)μm^(2),以特低孔-超低渗储层为主;根据储层分类评价标准,长6段储层由好到差依次分为Ⅰ,Ⅱ,Ⅲ类。沉积环境为研究区长6储层提供物质基础,成岩作用是研究区目的层形成致密储层的关键因素。胶结作用一定程度上充填孔隙、堵塞孔喉,降低储层物性,而溶蚀作用对于改善储层物性具有积极的作用。该研究成果为研究区进一步勘探开发提供借鉴。

关键词：鄂尔多斯盆地悦乐地区长6段储层特征沉积作用成岩作用

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