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Recent progress in single crystal perovskite X-ray detectors

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Science China(Information Sciences) 2024年第3期67卷 5-19页

作者： Xiao LIU Jun REN Yu-ang CHEN Xiangshun Geng Dan XIE Tian-ling REN School of Integrated Circuits Tsinghua University Beijing National Research Center for Information Science and Technology (BNRist)

Perovskites have attracted extensive attention as radiation detection material due to their long carrier diffusion length and lifetime, high absorption coefficient, and flexible manufacturing process. Compared with polycrystalline structures, single crystal perovskites improve the performance of optoelectronic devices due to their low defect state density, better photoelectric characteristics, and chemical ***, we review the recent progress of single crystal perovskite X-ray detectors. First, we briefly introduced the basic concepts, detection mechanisms, figure of merits of perovskite X-ray detectors, and the preparation methods of single crystal perovskites. Then, we summarized the significant advancements in single crystal perovskite X-ray detectors in recent times. Finally, we discussed the critical challenges and some practicable solutions for developing high-performance X-ray detectors.

关键词： single crystal perovskites carrier transport radiation detection X-ray detectors X-ray imaging

Proposal for valleytronic materials:Ferrovalley metal and valley gapless semiconductor

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Frontiers of physics 2024年第2期19卷 131-139页

作者： San-Dong Guo Yu-ling Tao Guangzhao Wang Shaobo Chen Dong Huang Yee Sin ang School of Electronic engineering Xi’an University of Posts and TelecommunicationsXi’an 710121China Key Laboratory of Extraordinary Bond engineering and Advanced Materials Technology of Chongqing School of Electronic Information EngineeringYangtze Normal UniversityChongqing 408100China College of Electronic and Information engineering Anshun UniversityAnshun 561000China Science Mathematics and Technology(SMT)Singapore University of Technology and Design(SUTD)8 Somapah RoadSingapore 487372Singapore

Valleytronic materials can provide new degrees of freedom to future electronic *** this work,the concepts of the ferrovalley metal(FVM)and valley gapless semiconductor(VGS)are proposed,which can be achieved in valleytronic bilayer systems by electric field *** valleytronic bilayer systems,the interaction between out-of-plane ferroelectricity and A-type antiferromagnetism can induce layer-polarized anomalous valley Hall(LP-AVH)*** K and−K valleys of FVM are both metallic,and electron and hole carriers simultaneously *** the extreme case,the FVM can become VGS by analogizing spin gapless semiconductor(SGS).Moreover,it is proposed that the valley splitting enhancement and valley polarization reversal can be achieved by electric field engineering in valleytronic bilayer *** the bilayer RuBr_(2)as an example,our proposal is confirmed by the first-principle *** FVM and VGS can be achieved in bilayer RuBr_(2)by applying electric *** appropriate electric field range,increasing electric field can enhance valley splitting,and the valley polarization can be reversed by flipping electric field *** effectively tune valley properties by electric field in bilayer systems,the parent monolayer should possess out-of-plane magnetization,and have large valley *** results shed light on the possible role of electric field in tuning valleytronic bilayer systems,and provide a way to design the ferrovalley-related material by electric field.

关键词： valleytronics electric field bilayer

Nestin在视神经横断大鼠视网膜Müller细胞上的诱导表达

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国际眼科杂志 2009年第3期9卷 433-436页

作者：薛黎萍丁鹏吴开力江春光胡竹林肖丽波刘海 eng-ang ling 云南省第二人民医院眼科中国云南省昆明市650031 中山大学中山眼科中心国家重点实验室中国广东省广州市510060 昆明医学院第一附属医院神经外科中国云南省昆明市650021 新加坡国立大学解剖学系 117597

目的:探讨中间丝蛋白nestin在视神经横断大鼠视网膜神经胶质细胞中的表达情况及可能的意义。方法:制作大鼠视神经横断模型,分别于术后1,3,7d取材,制作视网膜矢状位冰冻切片,进行GS/nestin,免疫荧光双标。提取视网膜总RNA行nestin Real-t... 详细信息

目的:探讨中间丝蛋白nestin在视神经横断大鼠视网膜神经胶质细胞中的表达情况及可能的意义。方法:制作大鼠视神经横断模型,分别于术后1,3,7d取材,制作视网膜矢状位冰冻切片,进行GS/nestin,免疫荧光双标。提取视网膜总RNA行nestin Real-time PCR半定量分析。结果:正常大鼠视网膜中几乎看不到nestin阳性染色。术后1d,在Müller细胞上出现nestin的诱导表达,术后3d,nestin在Müller细胞上的表达进一步增强,术后1wk,nes-tin在Müller细胞上的表达保持在较高水平,Real-time PCR半定量分析与以上结果吻合。结论:视神经横断后nestin在Müller细胞上的诱导表达是Müller细胞对视网膜损伤产生的一种反应,Nestin的表达量在一定时间内与病程进展相一致。Nestin在Müller细胞上的诱导表达尤其在足板处的强烈表达可能对视网膜神经节细胞具有保护作用。

关键词：视神经横断 Müller细胞 nestin

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Cardiovascular health awareness,risk perception,behavioural intention and INTERHEART risk stratification among middle-aged adults in Malaysia

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Asian Pacific Journal of Tropical Medicine 2024年第2期17卷 61-70页

作者： Siew-Keah Lee ang-Lim Chua Clement Heng Yew Fong Ban Hao Brian Cong Wen ling Ng Jing Feng Kong Yik-ling Chew Kai Bin Liew Yang Shao M.Kandiah Faculty of Medicine and Health Sciences Universiti Tunku Abdul RahmanMalaysia Faculty of Medicine Universiti Teknologi MARAMalaysia Faculty of Pharmaceutical Sciences UCSI UniversityMalaysia Faculty of Pharmacy University of CyberjayaMalaysia The First Affiliated Hospital of Hainan Medical University China

Objective:To investigate the interrelationship between cardiovascular health awareness,risk perception,behavioural intention,and INTERHEART risk stratification in a middle-aged adult population in ***:A cross-sectional survey with convenience sampling was conducted during November 2022 and January *** completed validated questionnaires assessing cardiovascular health awareness,risk perception of cardiovascular diseases,behavioural intention towards adopting healthy habits,and INTERHEART risk stratification score(IHRS)based on established risk factors.A total of 602 respondents were included in the final *** were analysed with independent t-test/one-way ANOVA or Mann-Whitney/Kruskal-Wallis to test the differences,Pearson correlation or linear regression test to analyze the association of independent and dependent ***:There was a significant positive correlation between medical knowledge related to cardiovascular disease(CVD)and knowledge related to CVD risk prevention,risk perception,behavioural intention and IHRS(P<0.05,Pearson correlation).Notably,individuals with higher IHRS tended to have lower knowledge related to CVD and CVD risk prevention,risk perception,and behavioural ***,laborers,active/former smokers,individuals with lower household income and educational levels,those involved in occupations not related to the healthcare sector,and those who did not receive the CVD health brochure or are unaware of health self-assessment tools are likely to have lower levels of knowledge,risk perception,and poorer behavioural intention regarding cardiovascular health(P<0.05,one-way ANOVA).While educational level,smoking status,awareness about CVD poster,self-assessment tools were repeatedly significantly associated with knowledge related to CVD and CVD risk prevention,risk perception,behavioral intention and/or IHRS(P<0.05,linear regression).Conclusions:These findings underscore the importance of promoting car

关键词： Cardiovascular risk Knowledge Risk perception Behavioural intention INTERHEART Middle-aged Lifestyle Physical activity Psychosocial stress

Dynamic recrystallization mechanism, texture evolution development and mechanical characteristics of a Mg–8.7Gd–4.18Y–0.42Zr magnesium alloy by ECAP

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Progress in Natural Science:Materials International 2024年第02期34卷 376-388页

作者： ling Zhang Yinglong Li School of Materials Science and engineering Northeastern University School of Mechanical and engineering Ningxia Institute of Science and Technology

Equal channel angle pressing is recognized for its ability to refine alloy grains and alter grain orientation, thereby achieve better mechanical performance of the magnesium alloy. This study investigates the microstructures,dynamic recrystallization mechanism, texture development, and mechanical performance of GW94K(Mg–8.7Gd–4.18Y–0.42Zr wt. %) Mg alloy following ECAP-4 passes at 400°C and 3 mm/min. Results show that when high-temperature deformation is undertaken, twin formation is suppressed while dislocation slip is facilitated, increasing dislocation density during deformation. Following ECAP deformation, the sample displayed higher fracture elongation, TYS, and UTS than the as-solutioned GW94K alloy. In particular, the GW94K alloy performed well mechanically after ECAP-4 passes, with an ultimate TYS of 231 MPa, an UTS of 290 MPa, and an elongation of 14.8 %. DDRX and shear bands induce CDRX, both of which are important in plastic deformation. as well as in modifying microstructure and grain orientation during ECAP deformation.

关键词： Dynamic recrystallization mechanism Equal channel angular pressing Magnesium alloy Mechanical performance Mg-Gd-Y-Zr alloy Texture development

Eigenvalues for the Clamped Plate Problem of L_(ν)^(2) Operator on Complete Riemannian Manifolds

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Acta Mathematica Sinica,english Series 2024年第9期40卷 2223-2243页

作者： ling Zhong Zeng Jiangxi Provincial Center for Applied Mathematics&School of Mathematics and Statistics Jiangxi Normal UniversityNanchang 330022P.R.China

L_(ν) operator is an important extrinsic differential operator of divergence type and has profound geometric *** this paper,we consider the clamped plate problem of L_(ν)^(2)operator on a bounded domain of the complete Riemannian manifolds.A general formula of eigenvalues of L_(ν)^(2) operator is *** this general formula,we obtain some estimates for the eigenvalues with higher order on the complete Riemannian *** several fascinating applications,we discuss this eigenvalue problem on the complete translating solitons,minimal submanifolds on the Euclidean space,submanifolds on the unit sphere and projective *** particular,we get a universal inequality with respect to the L_(II) operator on the translating ***,it is very difficult to get universal inequalities for weighted Laplacian and even Laplacian on the complete Riemannian ***,this work can be viewed as a new contribution to universal estimate.

关键词： Mean curvature flows L_(ν)^(2)operator clamped plate problem eigenvalues Riemannian manifolds translating solitons

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MODIFIED STOCHASTIC EXTRAGRADIENT METHODS FOR STOCHASTIC VARIATIONAL INEQUALITY

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Journal of Computational Mathematics 2024年第2期42卷 390-414页

作者： ling Zhang lingling Xu School of Management and Economic Beijing Institute of TechnologyBeijing 100081China School of Mathematical Sciences Nanjing Normal UniversityNanjing 210023China School of Mathematical Sciences and Jiangsu Key Laboratory for NSLSCS Nanjing Normal UniversityNanjing 210023China

In this paper,we consider two kinds of extragradient methods to solve the pseudo-monotone stochastic variational inequality ***,we present the modified stochastic extragradient method with constant step-size(MSEGMC)and prove the convergence of *** the strong pseudo-monotone operator and the exponentially growing sample sequences,we establish the R-linear convergence rate in terms of the mean natural residual and the oracle complexity O(1/ǫ).Second,we propose a modified stochastic extragradient method with adaptive step-size(MSEGMA).In addition,the step-size of MSEGMA does not depend on the Lipschitz constant and without any line-search ***,we use some numerical experiments to verify the effectiveness of the two algorithms.

关键词： Stochastic variational inequality Pseudo-monotone Modified stochastic ex-tragradient methods Adaptive step-size

Efficacy and safety of low-dose tetracycline,amoxicillin quadruple therapy in Helicobacter pylori infection:A retrospective single center study

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World Journal of Gastroenterology 2024年第39期30卷 4295-4304页

作者： Yi-Ru Zhao Xin-Jie Wang Meng-Jia Zhu ang-Li Chen Dian Zhang Qin Du John J Kim Wei-ling Hu Department of Gastroenterology Sir Run Run Shaw HospitalMedical SchoolZhejiang UniversityHangzhou 310016Zhejiang ProvinceChina Department of Gastroenterology The First Affiliated HospitalMedical SchoolZhejiang UniversityHangzhou 310003Zhejiang ProvinceChina Department of Gastroenterology The Second Affiliated Hospital of Zhejiang University School of MedicineHangzhou 310000Zhejiang ProvinceChina Keck School of Medicine University of Southern CaliforniaLos AngelesCA 90089-9021United States Institute of Gastroenterology Zhejiang UniversityHangzhou 310016Zhejiang ProvinceChina

BACKGROUND Helicobacter pylori(***)eradication rates have declined with the rise of antibiotic-resistant strains in recent *** highly effective with a low prevalence of resistance,standard dose tetracycline is associated with frequent adverse *** efficacy and safety of low-dose tetracycline as part of tetra-cycline and amoxicillin-containing bismuth quadruple therapy are not well *** To compare the efficacy and safety of low-dose compared to standard dose tetracycline with combined amoxicillin-containing bismuth quadruple therapy in patients with *** *** Consecutive patients with *** infection receiving tetracycline,amoxicillin,proton pump inhibitor,and bismuth for 14 days at Sir Run Run Shaw Hospital(1/2022-6/2023)were *** low-dose tetracycline group received tetracycline 500 mg twice daily(bid)while the standard dose group received 750 mg bid or 500 mg three times daily(tid).Primary endpoints were *** eradication rate and treatment-related adverse events.

关键词： Helicobacter pylori Tetracycline Amoxicillin Eradication Adverse events Bismuth quadruple therapy

Space telescope set to open a new chapter in China's solar research

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National Science Review 2024年第1期11卷 225-227页

作者： ling Xin 机构不祥

One year after China launched its first dedicated space telescope to study the Sun, the Advanced Space-based Solar Observatory(ASO-S) is now fine-tuned and ready for discoveries during the activity peak of this solar cycle. ‘ASO-S has completed its in-orbit tests, and all instruments are in stable operation. Some early results are already in the pipeline,’ said the mission’s chief scientist, Gan Weiqun, as the telescope was officially delivered to his co-workers at the Purple Mountain Observatories,

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