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Preface to the "Theory and Applications of Flexoelectricity" Special Issue of Acta Mechanica Solida Sinica

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ACTA MECHANICA SOLIDA SINICA 2024年第4期37卷 519-520页

作者： Deng, Qian zheng, yue Shen, Shengping Huazhong Univ Sci & Technol Sch Aerosp Engn Wuhan 430074 Peoples R China Sun Yat Sen Univ Sch Phys Guangzhou 510275 Peoples R China Xi An Jiao Tong Univ Sch Aerosp Engn Xian 710049 Peoples R China

Flexoelectricity refers to the electric polarization generated by non-uniform mechanical strains within dielectric materials and *** intriguing effect bridges the fields of materials science,mechanical engineering,and applied physics,offering a promising avenue for innovation in sensor technology,energy harvesting,multiphysics field coupling,among others.

关键词： offering bridges harvesting

Domain Engineering the Flexoelectric Response of BaTiO3-SrTiO3 Binary Films: A Phase Field Study

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ACTA MECHANICA SOLIDA SINICA 2024年第4期37卷 590-597页

作者： Tao, Junyu Zhang, Fan Zhang, Jianyuan Chen, Weijin zheng, yue Sun Yat Sen Univ Sch Mat Shenzhen Campus Shenzhen 518107 Peoples R China Sun Yat Sen Univ Sch Phys Guangdong Prov Key Lab Magnetoelectr Phys & Device Guangzhou 510275 Peoples R China Sun Yat Sen Univ Sch Phys State Key Lab Optoelect Mat & Technol Guangzhou 510275 Peoples R China Sun Yat Sen Univ Ctr Phys Mech & Biophys Sch Phys Guangzhou 510275 Peoples R China Southern Marine Sci & Engn Guangdong Lab Zhuhai Zhuhai 519082 Peoples R China

The flexoelectric effect describes the interplay between material polarization and strain gradient. While much research has focused on control strategies for flexoelectricity, the impact of ferroelectric domain structure on the flexoelectric effect remains elusive. Through phase field simulations, we conduct a comparative study on the flexoelectric response of two types of BaTiO3-SrTiO3 binary films: BaTiO3-SrTiO3 multilayers and (Ba,Sr)TiO3 solid solutions. Our findings reveal that the flexoelectric response of these two systems, at the same Ba/Sr ratio, differs not only in magnitude but also in other aspects like temperature dependence, linearity, and hysteresis, due to their different ferroelectric domain structures and evolution dynamics. Our study deepens our current understanding of flexoelectricity in ferroelectrics and suggests "domain engineering" as a potential way to tailor this effect.

关键词： Ferroelectric Flexoelectricity Multilayers Solid solution Phase field POLARIZATION

Optimizing 2D-metal contact in layered Tin-selenide via native oxide modulation

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Nano Research 2024年第4期17卷 3014-3020页

作者： yue zheng Qi You Zhentian Yin Jian Tang Ke Jiang Zihao Xie Henan Li Cheng Han Yumeng Shi International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China

The discovery of two-dimensional(2D)semiconductor has opened up new avenues for the development of short-channel field-effect transistors(FETs)with desired electrical *** them,orthorhombic tin-selenide(SnSe)has garnered increasing attention due to its potential applications in a variety of electronic,optoelectronic,and thermoelectric ***,the realization of high-performance SnSe FETs with low contact resistance(Rc)remains a ***,we systematically investigate the contact of few-layer SnSe FETs through the modulation of native oxide on SnSe by using different *** is found that chromium(Cr)-contacted devices possess the best FET performance,such as electron mobility up to 606 cm^(2)/(V·s)at 78 K,current on/off ratio exceeding 1010,and saturation current of~550μA/μm,where a negligible Schottky barrier(SB)of~30 meV and a low contact resistance of~425Ωμm are achieved.X-ray photoelectron spectroscopy(XPS)and cross-sectional electron dispersive X-ray spectroscopy(EDX)results further reveal that the improved contact arises from the Cr-induced reduction of native oxide(SnOx)to Sn,which thins the tunneling barrier for efficient electron *** findings provide a deep insight into the 2D-metal contact of SnSe and pave the way for its applications in future nanoelectronics.

关键词： few-layer SnSe field-effect transistors(FETs) Cr contact native oxide contact resistance(Rc) Schottky barrier(SB)

Comprehensive prognostic and immune analysis of sterol Oacyltransferase 1 in patients with hepatocellular carcinoma

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World Journal of Hepatology 2024年第3期16卷 439-451页

作者： Chang-Jiao Gan yue zheng Bin Yang Li-Min Cao Development Research Department National Medical Products Administration Institute of Executive DevelopmentBeijing 100071China School of Medicine Nankai University Affiliated Third Center HospitalTianjin 300070China Tianjin Institute of Hepatobiliary Disease The Third Central Hospital of TianjinTianjin 300170China Department of Science and Technology Tianjin Third Central HospitalTianjin 300170China

BACKGROUND Sterol O-acyltransferase 1(SOAT1)is an important target in the diagnosis and treatment of liver ***,the prognostic value of SOAT1 in patients with hepatocellular carcinoma(HCC)is still not *** To investigate the correlation of SOAT1 expression with HCC,using RNA-seq and gene expression data of The Cancer Genome Atlas(TCGA)-liver hepatocellular carcinoma(LIHC)and *** The correlation between SOAT1 expression and HCC was *** hazard regression models were conducted to investigate the prognostic value of SOAT1 in *** survival and disease-specific survival were explored based on TCGA-LIHC *** processes and functional pathways mediated by SOAT1 were characterized by gene ontology(GO)analysis and the Kyoto Encyclopedia of Genes and Genomes(KEGG)analysis of differentially expressed *** addition,the protein-protein interaction network and co-expression analyses of SOAT1 in HCC were performed to better understand the regulatory mechanisms of SOAT1 in this *** SOAT1 and SOAT2 were highly expressed in unpaired samples,while only SOAT1 was highly expressed in paired *** area under the receiver operating characteristic curve of SOAT1 expression in tumor samples from LIHC patients compared with para-carcinoma tissues was 0.748,while the area under the curve of SOAT1 expression in tumor samples from LIHC patients compared with GTEx was *** with higher SOAT1 expression had lower survival *** from GO/KEGG and gene set enrichment analyses suggested that the PI3K/AKT signaling pathway,the IL-18 signaling pathway,the calcium signaling pathway,secreted factors,the Wnt signaling pathway,the Jak/STAT signaling pathway,the MAPK family signaling pathway,and cell–cell communication were involved in such ***1 expression was positively associated with the abundance of macrophages,Th2 cells,T helper cells,CD56bright natural killer cells,and Th1 cells,and negatively

关键词： Sterol O-acyltransferase 1 Hepatocellular carcinoma Prognostic Immune

Interlayer exciton dynamics of transition metal dichalcogenide heterostructures under electric fields

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Nano Research 2024年第5期17卷 4555-4572页

作者： Jian Tang yue zheng Ke Jiang Qi You Zhentian Yin Zihao Xie Henan Li Cheng Han Xiaoxian Zhang Yumeng Shi International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China Key Laboratory of Luminescence and Optical Information Ministry of EducationInstitute of Optoelectronic TechnologyBeijing Jiaotong UniversityBeijing 100044China

Stacking single layers of atoms on top of each other provides a fundamental way to achieve novel material systems and engineer their physical properties,which offers opportunities for exploring fundamental physics and realizing next-generation optoelectronic *** the two-dimensional(2D)-stacked systems,transition metal dichalcogenide(TMDC)heterostructures are particularly attractive because they host tightly-bonded interlayer excitons which possess various novel and appealing *** interlayer excitons have drawn significant research attention and hold high potential for the application in unique optoelectronic devices,such as polarization-and wavelength-tunable single photon emitters,valley Hall transistors,and possible high-temperature *** development of these devices requires a comprehensive understanding of the fundamental properties of these interlayer excitons and the impact of electric fields on their *** this review,we summarize the recent advances on the understanding of interlayer exciton dynamics under electric fields in TMDC *** put emphasis on the electrical modulation of interlayer excitons’emission,the valley Hall transport of charge carriers after the separation of interlayer excitons by an electric field,and the correlation physics of interlayer excitons and charges under electrical doping and *** and perspectives are finally discussed for the application of TMDC heterostructures in future optoelectronics.

关键词： interlayer exciton transition metal dichalcogenide(TMDC)heterostructures circular polarization valley Hall effect strong coupling

Support design method for deep soft-rock tunnels in non-hydrostatic high in-situ stress field

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Journal of Central South University 2024年第7期31卷 2431-2445页

作者： zheng Ke-yue SHI Cheng-hua ZHAO Qian-jin LEI Ming-feng JIA Chao-jun PENG Zhu National Engineering Research Center of High-speed Railway Construction Technology Changsha 410075China School of Civil Engineering Central South UniversityChangsha 410075China China Railway Group Co. Ltd.Beijing 100039China

Due to the long-term plate tectonic movements in southwestern China,the in-situ stress field in deep formations is *** passing through deep soft-rock mass under non-hydrostatic high in-situ stress field,tunnels will suffer serious asymmetric *** is no available support design method for tunnels under such a situation in existing studies to clarify the support time and support *** study first analyzed the mechanical behavior of tunnels in non-hydrostatic in-situ stress field and derived the theoretical equations of the ground squeezing curve(GSC)and ground loosening curve(GLC).Then,based on the convergence confinement theory,the support design method of deep soft-rock tunnels under non-hydrostatic high in-situ stress field was established considering both squeezing and loosening *** addition,this method can provide the clear support time and support stiffness of the second layer of initial *** proposed design method was applied to the Wanhe tunnel of the China-Laos railway in *** data indicated that the optimal support scheme had a good effect on controlling the tunnel deformation in non-hydrostatic high in-situ stress *** applications showed that the secondary lining could be constructed properly.

关键词： non-hydrostatic stress field high in-situ stress deep soft-rock tunnel squeezing pressure loosening pressure support design method

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拓扑半金属表面态的输运特性

科学通报 2024年第1期69卷 68-79页

作者：郑悦陈伟南京大学物理学院固体微结构物理国家重点实验室南京210093 人工微结构科学与技术协同创新中心南京210093

拓扑电子体系是近年来凝聚态物理学的研究前沿,它以非平庸的体态拓扑以及奇异的表面态为主要特征.输运测量是研究拓扑电子体系最常用和最有效的手段之一,输运研究与新奇物理效应的探索以及电子器件相关应用都有密切的联系.基于拓扑绝缘... 详细信息

拓扑电子体系是近年来凝聚态物理学的研究前沿,它以非平庸的体态拓扑以及奇异的表面态为主要特征.输运测量是研究拓扑电子体系最常用和最有效的手段之一,输运研究与新奇物理效应的探索以及电子器件相关应用都有密切的联系.基于拓扑绝缘体的输运研究已经广泛地开展,其中的输运信号仅由拓扑表面态贡献;而拓扑半金属中体态和表面态共存,这在给输运研究带来复杂性的同时,也预示着更为丰富的物理现象有望被发现.大多数针对拓扑半金属输运性质的研究集中于其体态,而其表面态的贡献通常被认为小到可以忽略.需要指出,通过巧妙构筑输运器件结构,表面态可以贡献很强的输运信号并导致新奇而丰富的输运性质.本文介绍了若干典型拓扑半金属体系中表面态导致的新奇输运性质,包括拓扑节线半金属中鼓面表面态导致的共振自旋翻转反射及其输运信号,外尔半金属中费米弧表面态的奇异安德烈夫反射、法布里-珀罗干涉和门电压调控的栗弗席兹相变,以及这些效应对外场的奇特响应.本文介绍的研究成果为拓扑半金属表面态的探测与调控提供了新的思路.

关键词：节线半金属外尔半金属表面态费米弧量子输运

《钦定同文韵统》蒙古文、满文阿礼嘎礼比较研究

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故宫博物院院刊 2024年第7期 127-138,143页

作者：正月内蒙古大学蒙古学学院

《钦定同文韵统》是一部多文种合璧阿礼嘎礼字书,有梵、藏、满、汉四体合璧与梵、藏、满、蒙、汉五体合璧版之区别。本文首先阐释“阿礼嘎礼”的概念和范畴,认为“阿礼嘎礼”有广义和狭义之别,在此基础上以五体合璧版《钦定同文韵统》... 详细信息

《钦定同文韵统》是一部多文种合璧阿礼嘎礼字书,有梵、藏、满、汉四体合璧与梵、藏、满、蒙、汉五体合璧版之区别。本文首先阐释“阿礼嘎礼”的概念和范畴,认为“阿礼嘎礼”有广义和狭义之别,在此基础上以五体合璧版《钦定同文韵统》为研究对象,阐释了蒙古文、满文阿礼嘎礼字型的来源和结构特征,并对其异同进行了比较研究。

关键词：《钦定同文韵统》阿礼嘎礼蒙古文满文

基于转轮除湿的蒸发式过冷水制取流态冰方法的研究

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制冷学报 2024年第1期45卷 90-100页

作者：岳峥张小松东南大学能源与环境学院南京210096

本文围绕蒸发式过冷水制取流态冰,提出了一种新型的基于转轮除湿的流态冰制取系统,通过转轮除湿营造低水蒸气分压力环境,实现水滴的管外过冷,避免了传统过冷水法的冰堵问题和真空法能耗高的问题,并且同溶液除湿型制冰方法相比,系统设备... 详细信息

本文围绕蒸发式过冷水制取流态冰,提出了一种新型的基于转轮除湿的流态冰制取系统,通过转轮除湿营造低水蒸气分压力环境,实现水滴的管外过冷,避免了传统过冷水法的冰堵问题和真空法能耗高的问题,并且同溶液除湿型制冰方法相比,系统设备简单且除湿效果更好,实现了水滴更大的过冷度,依靠系统自身的冷凝热即可满足转轮再生需求。构建了完整制冰系统并分别建立了转轮除湿模型、CO_(2)热泵模型和蒸发制冰模型,通过模拟分析初步验证了系统的可行性与高效性,并研究了主要运行参数对系统性能的影响。结果表明:在最佳运行工况下,新型流态冰制取系统的制冰性能系数比传统过冷水法提高了25.9%,单周期制冰量提高了4.3倍。

关键词：蒸发转轮除湿流态冰 CO_(2)热泵性能系数