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Chinese Journal of Polymer Science 2021年第4期39卷 397-416,I0004页

作者： Feng Cai yu-xuan chen Wen-Zhong Wang Hai-Feng yu Department of Materials Science and Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of EngineeringPeking UniversityBeijing 100871China

The great potential of liquid-crystalline block copolymers(LCBCs)containing photoresponsive mesogens toward novel applications in photonics and nanotechnology has been attracting increasing attention,due to the combination of the inherent property of microphase separation of block copolymers and the hierarchically-assembled structures of liquid-crystalline polymers(LCPs).The periodically ordered nanostructures in bulk film of LCBCs can be acquired by supramolecular cooperative motion,derived from the interaction between liquid-crystalline elastic deformation and microphase separation,which are able to improve physical properties of polymer film toward advanced functional ***,various micro/nano-patterned structures have been fabricated via light manipulation of photoresponsive LCBCs with good reproducibility and mass *** to recent developments in synthesis and polymerization techniques,diverse azobenzene-containing LCBCs have been designed,resulting in the creation of a wide variety of novel *** review illustrates recent progresses in macroscopic regulation of hierarchical nanostructures in LCBCs towards functional *** existing challenges are also discussed,showing perspectives for future studies.

关键词： Liquid-crystalline block copolymers Microphase separation Hierarchical nanostructures Functional materials

A Liutex-based subgrid stress model for large-eddy simulation

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Journal of Hydrodynamics 2022年第6期34卷 1145-1150页

作者： yuan Ding Bi-yu Pang Bo-wen Yan Yi-qian Wang yu-xuan chen yue-hong Qian School of Mathematical Science Soochow UniversitySuzhou215006China Department of Computer Science and Technology Tsinghua UniversityBeijing100084China

The concept of vortex is crucial in both understanding and modeling of *** large eddy simulation(LES),the effect of small-scale eddies onto the large scales or the resolved flow field is modeled by subgrid stress *** though the rotating motions of fluids,i.e.,vortices or eddies are central in developing turbulent models,vortex identification methods are seldom used in these *** this study,we develop a new subgrid model based on the Liutex vector,a new quantity introduced to decompose fluid motions into rigid rotation,pure shear and stretching,and thus identify *** new model is then applied in a decaying homogeneous isotropic turbulence(DHIT)and a turbulent channel flow at Reynolds number Reτ=*** is shown that the new model can predict accurate energy spectra compared with experiments in DHIT and give a well-matched velocity profile in turbulent channel flow without changing the form of the *** directions include improvement of the Liutex based model,for example developing anisotropic subgrid models,and its applications in various turbulent flows.

关键词： Liutex large eddy simulation(LES) subgrid model homogeneous isotropic turbulence turbulent channel flow

In-situ synchrotron high energy X-ray diffraction study of spontaneous reorientation of R phase upon cooling in nanocrystalline Ti_(50)Ni_(45.5)Fe_(4.5)alloy

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Rare Metals 2022年第6期41卷 1948-1954页

作者： Zhi-yuan Ma yu-xuan chen Yang Ren Kai-yuan yu Da-Qiang Jiang Yi-Nong Liu Li-Shan Cui Department of Materials Science and Engineering China University of Petroleum(Beijing)Beijing 102249China Department of Physics City University of Hong KongHong Kong 999077China Centre for Neutron Scattering City University of Hong KongHong Kong 999077China Department of Mechanical Engineering The University of Western AustraliaPerthWA 6009Australia

This study investigated a peculiar phenomenon of self-reorientation of thermally formed R phase in nanocrystalline Ti_(50)Ni_(45.5)Fe_(4.5)by means of in-situ syn-chrotron high energy X-ray diffraction(HE-XRD).Two samples with different average grain sizes of 40 and 90 nm were investigated.R phase in the 40-nm grain size sample was found to self-reorient gradually upon cooling,whereas the same phenomenon did not occur in the 90-nm grain size *** self-reorientation process is attributed to the development and evolution of an internal stress anisotropy caused by the second order continuous lattice distortion of R phase upon further cooling in the small nanograined matrix,which lacks the self-accommodation mechanism for internal stress cancellation.

关键词： TiNiFe Martensitic transformation R phase reorientation Synchrotron diffraction Nanocrystalline material

Sn/n3O4-x heterostructure rich in oxygen vacancies with enhanced visible light photocatalytic oxidation performance

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International Journal of Minerals,Metallurgy and Materials 2021年第1期28卷 150-159页

作者： Rui-qi Yang Na Liang xuan-yu chen Long-wei Wang Guo-xin Song Yan-chen Ji Na Ren Ya-wei Lü Jian Zhang Xin yu Institute for Advanced Interdisciplinary Research(IAIR) University of JinanJinan 250022China School of physics and electronics Hunan UniversityChangsha 410082China Institute Charles Gerhardt UMR 5253CNRS-UM-ENSCMUniversitéde MontpellierPlace Eugène BataillonF-34095 Montpellier cedex 5France

Sn3O4, a common two-dimensional semiconductor photocatalyst, can absorb visible ***, owing to its rapid recombination of photogenerated electron-hole pairs, its absorption is not sufficient for practical *** this work, a Sn nanoparticle/Sn3O4-x nanosheet heterostructure was prepared by in situ reduction of Sn3O4 under a H2 *** Schottky junctions formed between Sn and Sn3O4-x can enhance the photogenerated carrier separation *** the hydrogenation process, a portion of the oxygen in the semiconductor can be extracted by hydrogen to form water, resulting in an increase in oxygen vacancies in the *** heterostructure showed the ability to remove Rhodamine *** cytocompatibility experiments proved that Sn/Sn3O4-x can significantly enhance cell compatibility and reduce harm to *** work provides a new method for the fabrication of a Schottky junction composite photocatalyst rich in oxygen vacancies with enhanced photocatalytic performance.

关键词： photocatalysis tin oxide oxygen vacancy Schottky junction photodegradation

Metal-to-insulator transition in platinum group compounds

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Rare Metals 2024年第8期43卷 3460-3474页

作者： yu-xuan Xia Jian-Gang He Nuo-Fu chen Ji-Kun chen School of New Energy North China Electric Power UniversityBeijing102206China School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China Key Laboratory of Advanced Materials and Devices for PostMoore Chips(Ministry of Education) School of Materials Science and EngineeringJniversity of Science and Technology BeijingBeijing 100083China

The metal-to-insulator transition(MIT) as usually achieved in 3d-orbital transitional metal(TM) compounds opens up a new paradigm in correlated electronics via triggering abrupt variations in their transportation *** to such 3d-orbital TM compounds,the MIT within the platinum group(Pg) element compounds based on the 4d-and 5d-orbital configurations is more complicated,owing to their elevation in the spinorbit coupling and meanwhile weakened intra-atomic Coulomb *** brings in a new freedom to regulate the balance in their metallic or semiconductive orbital configurations,while their MIT properties can be potentially combined with their spintronic properties to enable new electronic ***,we review the electronic transport and MIT behaviors within the existing family of Pg-containing compounds,particularly those showing first-order MIT behaviors that can be useful in correlated *** is also hoped that summarizing the presently reported Pg-containing MIT compounds will lead to the discovery of more new material families and/or new mechanisms associated with the Pg-containing compounds showing MIT properties.

关键词： Metal-to-insulator transition Platinum group compounds Electron correlation Spin-orbital coupling

Exosomes derived from stem cells as an emerging therapeutic strategy for intervertebral disc degeneration

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World Journal of Stem Cells 2020年第8期12卷 803-813页

作者： Zhi-Lei Hu Hai-Yin Li Xian Chang yue-Yang Li chen-Hao Liu Xiao-Xin Gao yu Zhai yu-xuan chen Chang-Qing Li Department of Orthopedics Xinqiao HospitalArmy Military Medical UniversityChongqing 400037China Center of Traumatic Orthopedics People's Liberation Army 990 HospitalXinyang 46400Henan ProvinceChina

Intervertebral disc(IVD)degenerative diseases are a common problem in the world,and they cause substantial social and economic burdens for *** current methods for treating IVD degenerative diseases mainly include surgery and conservative treatment,which cannot fundamentally restore the normal structure of the *** continuous research on the mechanism of degeneration and the development of regenerative medicine,rapid progress has been made in the field of regenerative medicine regarding the use of stem cell-derived exosomes,which are active biological substances used in intercellular communication,because they show a strong effect in promoting tissue *** study of exosomes in the field of IVD degeneration has just begun,and many surprising achievements have been *** paper mainly reviews the biological characteristics of exosomes and highlights the current status of exosomes in the field of IVD degeneration,as well as future developments regarding exosomes.

关键词： Exosomes Intervertebral disc degeneration Stem cells MicroRNA Regenerative medicine Biological characteristic

Capture Efficiency Analysis in the Circular Restricted Three-body Problem

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Research in Astronomy and Astrophysics 2024年第5期24卷 198-210页

作者： yu-xuan Miao Xi-yun Hou Department of Astronomy and Space Science Nanjing UniversityNanjing 210023China Institute of Space Environment and Astrodynamics Nanjing UniversityNanjing 210023China Key Laboratory of Modern Astronomy and Astrophysics Ministry of EducationNanjing 210023China

Temporary capture efficiency is studied in the framework of the circular restricted three-body problem in two ***, a non-uniform distribution of test particles around the secondary's orbit is obtained by fully accounting the secondary's gravitational influence. Second, the capture efficiency is computed based on the non-uniform distribution. Several factors influencing the result are discussed. By studying the capture efficiency in the circular restricted three-body problem of different mass ratios, a power-law relation between the capture efficiency(p) and the mass ratio(μ) is established, which is given by p ≈ 0.27 × μ^(0.53), within the range of 3.0035 ×10^(-6)≤ μ ≤ 3.0034 × 10^(-5). Taking the Sun–Earth system as an example, the influence from the orbit eccentricity of the secondary on the non-uniform distribution and the capture efficiency is studied. Our studies find that the secondary's orbit eccentricity has a negative influence on the capture efficiency.

关键词： methods numerical-celestial mechanics-planets and satellites dynamical evolution and stability

Microbiota in health and diseases

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Signal Transduction and Targeted Therapy 2022年第5期7卷 1491-1518页

作者： Kaijian Hou Zhuo-Xun Wu xuan-yu chen Jing-Quan Wang Dongya Zhang Chuanxing Xiao Dan Zhu Jagadish B.Koya Liuya Wei Jilin Li Zhe-Sheng chen Department of Endocrine and Metabolic Diseases Longhu HospitalThe First Affiliated Hospital of Medical College of Shantou UniversityShantouGuangdong 515000China Department of Pharmaceutical Sciences Institute for BiotechnologyCollege of Pharmacy and Health SciencesSt.John’s UniversityQueensNY 11439USA Microbiome Research Center Moon(Guangzhou)Biotech LtdGuangzhou 510535China School of Pharmacy Weifang Medical UniversityWeifangShandong 261053China Department of Cardiovascular The Second Affiliated Hospital of Medical College of Shantou UniversityShantouGuangdong 515000China

The role of microbiota in health and diseases is being highlighted by numerous studies since its *** on the localized regions,microbiota can be classified into gut,oral,respiratory,and skin *** microbial communities are in symbiosis with the host,contributing to homeostasis and regulating immune ***,microbiota dysbiosis can lead to dysregulation of bodily functions and diseases including cardiovascular diseases(CVDs),cancers,respiratory diseases.

关键词： diseases respiratory homeostasis

A prognostic four-gene signature and a therapeutic strategy for hepatocellular carcinoma:Construction and analysis of a circRNA-mediated competing endogenous RNA network

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Hepatobiliary & Pancreatic Diseases International 2024年第3期23卷 272-287页

作者： Hai-Yan Zhang Jia-Jie Zhu Zong-Ming Liu yu-xuan Zhang Jia-Jia chen Ke-Da chen Zhejiang Chinese Medical University Hangzhou 310053China Shulan International Medical College Zhejiang Shuren UniversityHangzhou 310015China State Key Laboratory for Diagnosis and Treatment of Infectious Diseases National Clinical Research Center for Infectious DiseasesNational Medical Center for Infectious DiseasesCollaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesThe First Affiliated HospitalZhejiang University School of MedicineHangzhou 310009China

Background:Hepatocellular carcinoma(HCC)has a poor long-term *** competition of circular RNAs(circRNAs)with endogenous RNA is a novel tool for predicting HCC *** on the alterations of circRNA regulatory networks,the analysis of gene modules related to HCC is ***:Multiple expression datasets and RNA element targeting prediction tools were used to construct a circRNA-microRNA-mRNA network in *** function,pathway,and protein interaction analyses were performed for the differentially expressed genes(DEGs)in this regulatory *** the proteinprotein interaction network,hub genes were identified and subjected to regression analysis,producing an optimized four-gene signature for prognostic risk stratification in HCC ***-HCC drugs were excavated by assessing the DEGs between the low-and high-risk groups.A circRNA-microRNA-hub gene subnetwork was constructed,in which three hallmark genes,KIF4A,CCNA2,and PBK,were subjected to functional enrichment ***:A four-gene signature(KIF4A,CCNA2,PBK,and ZWINT)that effectively estimated the overall survival and aided in prognostic risk assessment in the The Cancer Genome Atlas(TCGA)cohort and International Cancer Genome Consortium(ICGC)cohort was *** inhibitors,PI3K inhibitors,HDAC inhibitors,and EGFR inhibitors were predicted as four potential mechanisms of drug action(MOA)in high-risk HCC *** analysis has revealed that PBK,CCNA2,and KIF4A play a crucial role in regulating the tumor microenvironment by promoting immune cell invasion,regulating microsatellite instability(MSI),and exerting an impact on HCC ***:The present study highlights the role of the circRNA-related regulatory network,identifies a four-gene prognostic signature and biomarkers,and further identifies novel therapy for HCC.

关键词： Hepatocellular carcinoma circRNA-related ceRNA network Biomarker Least absolute shrinkage and selection operator Bioinformatics

Influence of ecological function protection zone on the water conservation in Gansu-Qinghai Contiguous Region of the upper Yellow River

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Journal of Mountain Science 2024年第4期21卷 1345-1357页

作者： TONG Huali chen Qingbo ZHANG xuan College of Geography and Environmental Science Northwest Normal UniversityLanzhou 730070China Gansu Province Land Use and Comprehensive Improvement Engineering Research Center Lanzhou 730070China

The implementation of Ecological Function Protection Zone(EFPZ)policy is significant for the ecological restoration and conservation of soil and water in the territory *** manuscript analyzed and quantified the impact of EFPZ on the regional water conservation function,based on land use data from 2005,2008,2010,2015 and 2020,by conducting a counterfactual simulation along with the GeoSOS-FLUS model and the InVEST *** results demonstrate that the delineation of EFPZ can significantly influence the water conservation.(1)From 2010 to 2020,as the EFPZ was implemented,the water conservation in the study area was increasing year by year,with a growth rate of 0.03×10^(8) m^(3)∙a^(-1).On the other hand,the simulated water conservation capacity without the implementation of EFPZ decreased year by year,with a decrease rate of 0.01×10^(8) m^(3)∙a^(-1).(2)The EFPZ accounts for only 23%of the total area,but the contribution rate of water conservation reaches 80%.The actual values of water conservation and average water yield per unit pixel in the EFPZ show an increasing trend both internally and externally,while the counterfactual simulation values exhibit a decreasing trend.(3)The water conservation is much higher within the EFPZ than without *** implementation of EFPZ has a significant effect on the improvement of the water conservation capacity in Maqu EFPZ and Yellow River Source *** protection effectiveness should be enhanced in Qilian Mountain EFPZ and afforestation activities need to be carefully considered in Loess Plateau EFPZ.

关键词： Water conservation function Ecological Function Protection Zone Counterfactual simulation Geo SOS-FLUS model InVEST model