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High-temperature self-powered X-ray detection in a bilayered hybrid ferroelectric halide perovskite

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Science China Chemistry 2025年

作者： Yingying Zheng Panpan Yu Yunpeng Yao Shihai You Zeng-kui zhu Junhua Luo School of Chemistry and Chemical Engineering Jiangxi Normal University Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal University School of Environmental and Material Engineering Yantai University Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China

X-ray detectors which convert X-ray irradiation into electrical signals play an important role in diverse applications including medical diagnosis, security examination, nondestructive inspection, personal X-ray dosimeters and fundamental research[1–5]. Recently, metal halide perovskites（MHP） have been developed as a promising family for X-ray detection contributing to their intrinsic advantages, e.g.,simple synthesis, efficient X-ray absorption and excellent semiconducting properties[5–10].

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Separation and enrichment mechanism of C54–TiSi_(2) from hypoeutectic Ti–65 wt.%Si alloy during directional solidification via alternating electromagnetic fields

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Journal of Iron and Steel Research International 2021年第1期28卷 29-37页

作者： kui‑song zhu Jing‑fei Hu Wen‑hui Ma kui‑xian Wei Yong‑nian Dai The National Engineering Laboratory for Vacuum Metallurgy State Key Laboratory of Complex Nonferrous Metal Resources Clean UtilizationKunming University of Science and TechnologyKunming 650093YunnanChina College of Vanadium and Titanium Panzhihua UniversityPanzhihua 617000SichuanChina Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Provincial UniversitiesKunming University of Science and TechnologyKunming 650093YunnanChina

The effects of directional solidification parameters and the coupling of directional solidification parameters and alternating electromagnetic fields on separation and enrichment of the C54–TiSi2 phase were investigated in a directionally solidified hypoeutectic Ti–65 wt.%Si *** results indicated that by increasing the pull-down velocity at a given position within the ingot,the cooling rate,growth rate,and temperature gradient of ingot could be *** a pull-down velocity near 5μm/s,the temperature gradient,cooling rate,and growth rate decreased with increasing the thickness of the C54–TiSi2-rich *** fields enhanced mass transfer at pull-down velocities of 5,10,15,and 20μm/s,with resulting enriched layer thicknesses of 15,10,10,and 5 mm,*** increasing the percentage of Ti in the Ti–Si alloy from 25 to 35 wt.%,the thickness of the C54–TiSi2-rich layer was increased from 2.5 to 3.3 ***,the maximum C54–TiSi2 content obtained experimentally in this layer decreased from 92.06 to 79.49 mass%.

关键词： Ti–Si alloy Directional solidification Electromagnetic field Separation C54–TiSi2

Primal-Dual ε-Subgradient Method for Distributed Optimization

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Journal of Systems Science & Complexity 2023年第2期36卷 577-590页

作者： zhu kui TANG Yutao School of Artificial Intelligence Beijing University of Posts and TelecommunicationsBeijing 100876China

This paper studies the distributed optimization problem when the objective functions might be nondifferentiable and subject to heterogeneous set *** existing subgradient methods,the authors focus on the case when the exact subgradients of the local objective functions can not be accessed by the *** solve this problem,the authors propose a projected primaldual dynamics using only the objective function’s approximate *** authors first prove that the formulated optimization problem can generally be solved with an error depending upon the accuracy of the available ***,the authors show the exact solvability of this distributed optimization problem when the accumulated approximation error of inexact subgradients is not too *** that,the authors also give a novel componentwise normalized variant to improve the transient behavior of the convergent *** effectiveness of the proposed algorithms is verified by a numerical example.

关键词： Constrained optimization distributed optimization e-subgradient primal-dual dynamics

Intraoperative management and early post-operative outcomes of patients with coronary artery disease who underwent orthotopic liver transplantation

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Hepatobiliary & Pancreatic Diseases International 2020年第1期19卷 12-16页

作者： Hai-Ying Kong xian Zhao kui-Rong Wang Department of Anesthesiology The First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China Department of Anesthesiology International HospitalZhejiang UniversityHangzhou 310000China

Background: Coronary artery disease (CAD) is frequently observed in aging end-stage liver disease (ESLD) patients who require orthotopic liver transplantation (OLT). This situation is challenging for both the pa- tients and the medical staff. Methods: We retrospectively studied the case records of 26 ESLD patients with CAD who underwent OLT with total clamping of the inferior vena cava between 2014 and 2018. We analyzed the details of the pre-operative evaluation, intraoperative anesthetic management and post-operative prognosis of these patients. Results: All patients tolerated the anhepatic stage well. Post-reperfusion syndrome (PRS) was observed in 13 patients (50%) and 2 of them were severe but corrected well. ST-segment depression was frequently observed during the anhepatic stage and reperfusion stage. No mortality due to cardiac-related events occurred among the patients during hospitalization. OLT with the modi ed piggyback technique could successfully be performed in ESLD patients with mild and moderate CAD. Conclusions: A thorough evaluation and optimization of recipients, strict monitoring and optimized man-agement of circulation, knowledge of the complicated changes during OLT procedures, and strategies to ameliorate post-reperfusion syndrome favorite the outcomes.

关键词： Orthotopic liver transplantation Coronary artery disease Post-reperfusion syndrome

Mechanism of primary Si and Fe-segregation for a hypereutectic 90 wt.%Si-Ti alloy melt in directional solidification via electromagnetism

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Journal of Iron and Steel Research International 2023年第4期30卷 726-735页

作者： kui-song zhu Li Cao Ying-tao Zhao Jun Wang xiang-kui Cheng College of Vanadium and Titanium Panzhihua UniversityPanzhihua 617000SichuanChina

The electromagnetic directional solidification(DS)phase separation experiments of high silicon 90 wt.%Si–Ti alloy were performed under various pulling-down *** results showed that Si enriched layer,Si+TiSi_(2)-rich layer and Si–Ti–Fe alloy layer appeared successively in axial direction of ingot after electromagnetic DS of 90 wt.%Si–Ti alloy melt at different pulling-down *** of primary Si and segregation mechanism of metal impurities(Fe)during the electromagnetic DS process were controlled by pulling-down speed of ingot and electromagnetic *** pulling-down speed was 5μm/s,minimum thickness of the Si enriched layer was 29.4 mm,and the highest content of primary Si in this layer was 92.46 wt.%;meanwhile,the highest removal rate of Fe as metal impurity was 92.90%.The type of inclusions in the Si enriched layer is determined by Fe content of segregated Si enriched *** the pulling-down speed was 5μm/s,the inclusions in the Si enriched layer were TiSi_(2).Finally,when the pulling-down speed reached greater than 5μm/s,the inclusions in the Si enriched layer evolved into TiSi_(2)+τ_(5).

关键词： High silicon Si-Ti alloy Primary Si Electromagnetic directional solidification Si enriched layer Impurity segregation

Experimental Evaluation on Grinding Texture on Flank Face in Chamfer Milling of Stainless Steel

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Chinese Journal of Mechanical Engineering 2018年第4期31卷 117-123页

作者： xian-Li Liu Jin-kui Shi Wei Ji Li-Hui Wang Harbin University of Science and Technology KTH Royal Institute of Technology

The surface quality of chamfer milling of stainless steel is closed related to the products of 3 C(Computer, Communication and Consumer electronics), where a cutter is a major part to achieve that. Targeting a high-quality cutter,an experimental evaluation is carried out on the influence of grinding texture of cutter flank face on surface *** mathematic models of chamfer cutter are established, and they are validated by a numerical simulation. Also the grinding data are generated by the models and tested by a grinding simulation for safety reasons. Then, a set of chamfer cutting tools are machined in a five-axis CNC grinding machine, and consist of five angles between the cutting edge and the grinding texture on the 1 st flank faces, i.e., 0°, 15°, 30°, 45° and 60°. Furthermore, the machined cutting tools are tested in a series of milling experiments of chamfer hole of stainless steel, where cutting forces and surface morphologies are measured and observed. The results show that the best state of both surface quality and cutting force is archived by the tool with 45° grinding texture, which can provide a support for manufacturing of cutting tool used in chamfer milling.

关键词： Grinding texture Chamfer cutter Cutting force Surface quality

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明代嘉鱼李憭与四邑公堤修筑始末考

湖北科技学院学报 2025年第1期45卷 10-18页

作者：朱志先张霞湖北科技学院人文与传媒学院湖北咸宁437100

从宋代开始,为解决长江水对江夏、嘉鱼、咸宁、蒲圻四地沿江造成的水患,四地主政者不断修筑江堤,各地利害关系不一,所修江堤效果不太理想。明代万历年间,在嘉鱼李憭的呼吁协调下,历时数年,加固老堤,修筑新堤,长达上百里,被誉为四邑公堤... 详细信息

从宋代开始,为解决长江水对江夏、嘉鱼、咸宁、蒲圻四地沿江造成的水患,四地主政者不断修筑江堤,各地利害关系不一,所修江堤效果不太理想。明代万历年间,在嘉鱼李憭的呼吁协调下,历时数年,加固老堤,修筑新堤,长达上百里,被誉为四邑公堤,有效抵制了江水泛滥所造成的危害。其间,李憭在四邑公堤的修筑筹备方面积极倡导和协调,在修筑制度方面采取因地制宜灵活变通的措施,在修筑经费方面据实情合理估算费用,保证四邑公堤顺利完工。

关键词：明代嘉鱼李憭四邑公堤水利

Development and application of a two-dimensional water quality model for the Daqinghe River Mouth of the Dianchi Lake

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Journal of Environmental Sciences 2009年第3期21卷 313-318页

作者： CHEN Qiuwen TAN kui zhu Chuanbao LI Ruonan Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Hydrological Bureau Ministry of Water Resources Beijing 100022 China

Water quality models are important tools to support the optimization of aquatic ecosystem rehabilitation programs and assess their efficiency. Basing on the flow conditions of the Daqinghe River Mouth of the Dianchi Lake, China, a two-dimensional water quality model was developed in the research. The hydrodynamics module was numerically solved by the alternating direction iteration （ADI） method. The parameters of the water quality module were obtained through the in situ experiments and the laboratory analyses that were conducted from 2006 to 2007. The model was calibrated and verified by the observation data in 2007. Among the four modelled key variables, i.e., water level, COD （in CODcr）, NH4＋-N and PO43-P the minimum value of the coefficient of determination （COD） was 0.69, indicating the model performed reasonably well. The developed model was then applied to simulate the water quality changes at a downstream cross-section assuming that the designed restoration programs were implemented. According to the simulated results, the restoration programs could cut down the loads of COD and PO43-P about 15%. Such a load reduction, unfortunately, would have very little effect on the NH4^＋-N removal. Moreover, the water quality at the outlet cross-section would be still in class V （3838-02）, indicating more measures should be taken to further reduce the loads. The study demonstrated the capability of water quality models to support aquatic ecosystem restorations.

关键词： two-dimensional water quality model parameter estimation restoration program evaluation Dianchi Lake

Influence of social capital on the livelihood strategies of farmers under China's rural revitalization strategy in poor mountain areas: A case study of the Liangshan Yi autonomous prefecture

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Journal of Mountain Science 2022年第4期19卷 958-973页

作者： HE Ren-wei GUO Shi-li DENG xian ZHOU kui Institute of City Situation Survey Research Beijing Academy of Social SciencesBeijing 100101China School of Resources and Environment Xichang CollegeXichang 615013China China Western Economic Research Center Southwestern University of Finance and EconomicsChengdu 611130China Office Service Center of Standing Committee of Neijiang Municipal People’s Congress Neijing 641000China

Social capital in the form of social resources or social networks is one of the most important livelihood capital of farmers, which can increase the labor productivity of poor households and increase income. It is important to explore the reasons underlying the livelihood strategy choices of farmers from the perspective of social capital under China’s rural revitalization strategy. In this study, the Liangshan Yi Autonomous Prefecture, a povertystricken mountainous area in southwestern China, was selected as the case study area, and multivariable linear regression models were constructed to analyze the influence of social capital on livelihood *** results are as follows:(1) Individual social capital had a positive effect on non-agricultural livelihood strategies. On average, with a one-unit increase in individual social capital, the ratio of farmers’ nonagricultural income to total productive income(Income_Rto) increased by 0.002% and 0.062%,respectively. Collective social capital, with the Peasant Economic Cooperation Organization(PECO) as the carrier, had a negative effect on the non-agricultural livelihood strategies of farmers;on average, with a oneunit increase in PECO, Income_Rto decreased by approximately 0.053%. However, this effect was only significant in the river valley area.(2) The income differences among the different livelihood strategy types were explained by the livelihood strategy choices of farmers. As non-agricultural work can bring more benefits, the labor force exhibited one-way migration from villages to cities, resulting in a lack of the subject of rural revitalization. It is necessary to implement effective measures to highlight the role of PECO in increasing agricultural income for farmers. Finally,based on the above conclusions,policy recommendations with respect to livelihood transformation of farmers and rural sustainable development are discussed.

关键词： Social capital Livelihood strategies Village types Rural revitalization Poor mountain areas Liangshan Yi Autonomous Prefecture