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Structural and Ferroelectric Transition in Few-Layer HfO_(2) Films by First Principles Calculations

Chinese Physics Letters 2024年第8期41卷 94-106页

作者： ruiling gao Chao Liu Bowen Shi Yongchang Li Bing Luo Rui Chen Wenbin Ouyang Heng gao Shunbo Hu Yin Wang Dongdong Li Wei Ren Materials Genome Institute State Key Laboratory of Advanced Special SteelShanghai Key Laboratory of High Temperature SuperconductorsInternational Center of Quantum and Molecular StructuresPhysics DepartmentInstitute for the Conservation of Cultural HeritageShanghai UniversityShanghai 200444China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Shanghai World Foreign Language Academy Shanghai 200233China Key Laboratory of Silicate Cultural Relics Conservation(Ministry of Education) Shanghai UniversityShanghai 200444China Hongzhiwei Technology(Shanghai)Co. Ltd.Shanghai 201206China Zhangjiang Laboratory Shanghai 201210China

The discovery of ferroelectricity in HfO_(2)-based materials with high dielectric constant has inspired tremendous research interest for next-generation electronic ***,films structure and strain are key factors in exploration of ferroelectricity in fluorite-type oxide HfO_(2) *** we investigate the structures and straininduced ferroelectric transition in different phases of few-layer HfO_(2) films(layer number𝑁=1–5).It is found that HfO_(2) films for all phases are more stable with increasing films *** them,the Pmn2_(1)(110)-oriented film is most stable,and the films of𝑁=4,5 occur with a𝑃21 ferroelectric transition under tensile strain,resulting in polarization about 11.8μC/cm^(2) along in-plane𝑎-*** ferroelectric transition is caused by the strain,which induces the displacement of Hf and O atoms on the surface to non-centrosymmetric positions away from the original paraelectric positions,accompanied by the change of surface Hf–O bond *** importantly,three new stable HfO_(2)2D structures are discovered,together with analyses of computed electronic structures,mechanical,and dielectric *** work provides guidance for theoretical and experimental study of the new structures and strain-tuned ferroelectricity in freestanding HfO_(2) films.

关键词： properties. ferroelectric positions

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ABC分类绩效管理法对医务人员服务质量、心理健康及工作满意度的影响

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中国健康心理学杂志 2024年第2期32卷 240-245页

作者：李聪艺高瑞玲河南省南阳市第一人民医院 473000 郑州市第一人民医院

目的:探究基于ABC分类绩效管理法对医务人员的影响。方法:选取2021年3月-2022年3月某院200名在职医务人员,随机分为对照组和观察组,各100例,对照组采用统一医院绩效管理模式,观察组给予基于ABC分类绩效管理法。比较两组服务质量[医疗服... 详细信息

目的:探究基于ABC分类绩效管理法对医务人员的影响。方法:选取2021年3月-2022年3月某院200名在职医务人员,随机分为对照组和观察组,各100例,对照组采用统一医院绩效管理模式,观察组给予基于ABC分类绩效管理法。比较两组服务质量[医疗服务质量量表(CQS)]、心理健康[焦虑自评表(SAS)和抑郁自评表(SDS)]、主观幸福感[主观幸福感量表(GWB)]、工作满意度[明尼苏达工作满意度问卷短式量表(MSQ)]及同情疲劳状况调查[职业生命质量量表中文版(ProQOL)]。结果:干预后与对照组相比,观察组CQS各维度评分明显较高(t=-6.944,-6.920,-7.220;P<0.05),SAS评分和SDS评分明显较低(t=4.894,4.145;P<0.05),GWB各维度评分明显较高(t=-8.548,-4.699,-5.972,-6.778,-9.472,-6.377;P<0.05),MSQ各维度评分明显较高(t=-7.939,-8.925,-7.151;P<0.05),ProQOL各维度评分明显较低(t=10.441,9.667,5.661;P<0.05)。结论:针对医务人员给予基于ABC分类绩效管理法,可明显改善其服务质量,促进心理健康,增加主观幸福感,提升工作满意度,改善同情疲劳状况。

关键词： ABC分类绩效管理法医务人员服务质量心理健康工作满意度

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Research progress of siloxane removal from biogas

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International Journal of Agricultural and Biological Engineering 2017年第1期10卷 30-39页

作者： gao ruiling Cheng Shikun Li Zifu School of Energy and Environmental Engineering Beijing Key Laboratory of Resource-oriented Treatment of Industrial PollutantsUniversity of Science and Technology BeijingBeijing 100083China

Siloxanes in biogas are detrimental to engine,turbine,fuel cell,etc.,thus it is necessary to remove siloxanes from biogas before biogas high-value *** present,there are few domestic researches and related reports in view of siloxanes removal from *** paper introduces the property of siloxanes as well as sampling and analysis method,and then presents the research progress of siloxanes removal from *** commercial technologies overseas are adsorption,absorption and cryogenic *** them,adsorption on activated carbon is the most widely used *** technologies,such as biological removal,catalytic processes,membranes,source controlling,*** under exploration and *** last,this paper summarizes the advantages and disadvantages of siloxanes removal technologies as well as the applicability and analyzes the future research trend and *** paper could provide a reference in the field of biogas high-value utilization.

关键词： biogas purification siloxane removal activated carbon adsorption physical and chemical absorption biological removal

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Online measurement of alkalinity in anaerobic co-digestion using linear regression method

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International Journal of Agricultural and Biological Engineering 2017年第1期10卷 176-183页

作者： Bai Xue Li Zifu Wang Xuemei He Xi Cheng Shikun Bai Xiaofeng gao ruiling School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants Beijing 100083China International Science and Technology Cooperation Base for Environmental and Energy Technology of MOST Beijing 100083China

Alkalinity is a reliable indicator of process stability in anaerobic digestion *** alkalinity(TA)and partial alkalinity(PA)are usually monitored offline as indicators for the status of anaerobic digestion *** order to online monitor TA and PA,the linear regression method was used as estimator to predict alkalinity via software sensor ***,namely,pH,oxidation and reduction potential(ORP),and electrical conductivity(EC),were used as input *** was the most significant parameter with TA and *** linear regression(MLR)models and simple linear regression models with EC were constructed to predict TA and PA in anaerobic co-digestion *** the basis of the evaluation of prediction accuracy,the applications of linear regression models were better for monitoring PA than *** models provided higher accuracy for alkalinity prediction than simple linear regression *** two MLR models based on single-phase anaerobic digestion system were also feasible to predict TA in anaerobic co-digestion ***,the accuracy of these models should be improved by calibrating for broad applications of linear regression method in online alkalinity measurement.

关键词： anaerobic digestion alkalinity online measurement model linear regression

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Defatted Hickory Meal Hydrolysate's Impact on Memory Impairment Induced by D-Galactose in Mice

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Food Science and Human Wellness 2024年

作者： Fanping Qin ruiling Liu Qi Kong Hangjun Chen Xiangjun Fang Huizhi Chen Weijie Wu Haiyan gao State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products Key Laboratory of Post-Harvest Vegetable Preservation and Processing (Co-construction by Ministry and Province) Ministry of Agriculture and Rural Affairs Key Laboratory of Light Industry Fruit and Vegetable Preservation and Processing Institute of Food Science Zhejiang Academy of Agricultural Sciences

Defatted hickory meal (DHM)， a by-product of hickory oil production， is a protein source rich in essential amino acids. In this study， the functional properties of DHM hydrolysate (DHMH) were assessed using in vitro and in vivo assays in context to its antioxidant and memory-enhancing effects. To induce memory impairment， D-galactose (D-gal) was administered to mice at a dose of 120 mg/kg body weight per day， and DHMH was orally administered at doses of 300， 600， and 1000 mg/kg body weight per day for 8 weeks. DHMH treatment led to improved memory performance in D-gal-induced memory-impaired mice， as observed in the Morris water maze test. Furthermore， DHMH mitigated the accumulation of amyloid beta 1-42 triggered by D-gal exposure. Notably， high-dose DHMH significantly reduced the elevation of pro-inflammatory markers， including tumor necrosis factor alpha， interleukin 1β， and interleukin 6. Additionally， DHMH prevented the decline in total superoxide dismutase activity， glutathione peroxidase activity， and glutathione levels， while reducing malondialdehyde content in D-gal-induced mice， indicative of its antioxidant properties. Moreover， DHMH treatment effectively prevented histological alterations in neurons within the hippocampal CA1 area induced by D-gal. Collectively， our findings suggest that DHMH may counteract memory dysfunctions resulting from oxidative stress injury in the brain， positioning it as a potential candidate for use as a functional food.

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Two-Dimensional Electron Gas in MoSi_(2)N_(4)/VSi_(2)N_(4)Heterojunction by First Principles Calculation

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Chinese Physics Letters 2022年第12期39卷 57-64页

作者：高瑞灵刘超方乐姚碧霞吴伟肖祁陵胡顺波刘禹高恒曹世勋宋广生孟祥建陈效双任伟 Physics Department State Key Laboratory of Advanced Special SteelMaterials Genome InstituteShanghai Key Laboratory of High Temperature SuperconductorsInternational Center of Quantum and Molecular StructuresShanghai UniversityShanghai 200444China Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials(Ministry of Education) Anhui University of TechnologyMaanshan 243002China State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China

Van der Waals(vdW)layered two-dimensional(2D)materials,which may have high carrier mobility,valley polarization,excellent mechanical properties and air stability,have been widely investigated *** explore the possibility of producing a spin-polarized two-dimensional electron gas(2DEG)in the heterojunction composed of insulators MoSi_(2)N_(4)and VSi_(2)N_(4)by using first-principles *** to the charge transfer effect,the 2DEG at the interface of the MoSi_(2)N_(4)/VSi_(2)N_(4)heterojunction is ***,for different kinds of stacking of heterojunctions,lattice strain and electric fields can effectively tune the electronic structures and lead to metal-to-semiconductor *** compressive strain or electric field parallel to c axis,the 2DEG disappears and band gap opening *** the contrary,interlayer electron transfer enforces the system to become metallic under the condition of tensile strain or electric field anti-parallel to c *** changes are mainly attributed to electronic redistribution and orbitals’*** addition,we reveal that MoSi_(2)N_(4)/VSi_(2)N_(4)lateral heterojunctions of armchair and zigzag edges exhibit different electronic properties,such as a large band gap semiconductor and a metallic *** findings provide insights into electronic band engineering of MoSi_(2)N_(4)/VSi_(2)N_(4)heterojunctions and pave the way for future spintronics applications.

关键词： heterojunction polarization metallic

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Thermal and mechanical behavior of casting copper alloy wheel during wheel and belt continuous casting process

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China Foundry 2024年第1期21卷 82-90页

作者： Kun gao Yan Peng School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

To investigate the thermal and mechanical behavior of casting wheel,a two-dimensional thermoelastic-plastic finite element model was used to predict the temperature,stress and distortion distribution of the casting wheel during the wheel and belt continuous casting *** effects of grinding thickness and casting speed on the thermal and mechanical behaviors of the center of the hot face of the casting wheel were discussed in *** each rotation,the casting wheel passes through four different spray *** results show that the temperature distribution of the casting wheel in different spray zones is similar,the temperature of the hot face is the highest and the temperature reaches the peak in the spray zoneⅢ.The stress and distortion depend on the temperature distribution,and the maximum stress and distortion of the hot face are 358.2 MPa and 1.82 mm,*** temperature at the center of the hot face decreases with increasing grinding thickness and increases with increasing casting speed.

关键词： casting wheel finite element model grinding thickness casting speed hot face spray zones

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Durable poly(binaphthyl-co-p-terphenyl piperidinium)-based anion exchange membranes with dual side chains

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Journal of Energy Chemistry 2024年第2期89卷 324-335,I0008页

作者： Weiting gao Xuelang gao Qiugen Zhang Aimei Zhu Qinglin Liu Department of Chemical&Biochemical Engineering Fujian Provincial Key Laboratory of Theoretical and Computational ChemistryThe College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005FujianChina Department of Chemistry Pohang University of Science and Technology(POSTECH)Pohang 790-784South Korea

Building well-developed ion-conductive highways is highly desirable for anion exchange membranes(AEMs).Grafting side chain is a highly effective approach for constructing a well-defined phaseseparated morphological structure and forming unblocked ion pathways in AEMs for fast ion *** of side chains can further enhance phase separation due to the superhydrophobic nature of fluorine ***,their electronic effect on the alkaline stability of side chains and membranes is rarely ***,fluorine-containing and fluorine-free side chains are introduced into the polyaromatic backbone in proper configuration to investigate the impact of the fluorine terminal group on the stability of the side chains and membrane *** poly(binaphthyl-co-p-terphenyl piperidinium)AEM(QBNp TP)has the highest molecular weight and most dimensional stability due to its favorable backbone arrangement among ortho-and meta-terphenyl based ***,by introducing both a fluorinated piperidinium side chain and a hexane chain into the p-terphenyl-based backbone,the prepared AEM(QBNp TP-QFC)presents an enhanced conductivity(150.6 m S cm^(-1))and a constrained swelling at 80℃.The electronic effect of fluorinated side chains is contemplated by experiments and *** results demonstrate that the presence of strong electro-withdrawing fluorine groups weakens the electronic cloud of adjacent C atoms,increasing OH^(-)attack on the C atom and improving the stability of piperidinium *** QBNp TP-QFC possesses a robust alkaline stability at 80℃(95.3%conductivity retention after testing in 2 M Na OH for 2160 h).An excellent peak power density of 1.44 W cm^(-2)and a remarkable durability at 80℃(4.5%voltage loss after 100 h)can be observed.

关键词： Anion exchange membranes Backbone structure Fluorinated side chain Alkaline stability

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On the core entropy of Newton maps

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Science China Mathematics 2024年第1期67卷 77-128页

作者： Yan gao Department of Mathematics Shenzhen UniversityShenzhen 518060China

In this paper,we define the core entropy for postcritically-finite Newton maps and study its continuity within this *** show that the entropy function is not continuous in this family,which is different from the polyn... 详细信息

关键词： core entropy extended Newton graph critical marking polynomial Newton map

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Segmental nature of the Red River fault revealed by seismic anisotropy and geological structures

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Science China Earth Sciences 2024年第8期67卷 2423-2443页

作者： Ying LI Yuan gao School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Key Laboratory of Earthquake Prediction Institute of Earthquake ForecastingChina Earthquake AdministrationBeijing 100036China

As the western boundary of the Sichuan-Yunnan block(SYB),the Red River fault(RRF)is a major fault that controls deep crustal movement and deformation in the southeast margin of the Tibetan Plateau and regulates middle-lower crustal *** data suggest that the RRF is segmented and exhibits distinct variations in seismicity,velocity structure and crustal deformation from north to *** anisotropy reveals a complex pattern of lateral spatial and vertical stratified distributions.(1)From the perspective of crustal stratification,in the upper crust,the fast wave polarization in the north segment of the RRF is complex and possibly influenced by the Sanjiang lateral collision zone and adjacent faults with varying *** fast wave polarization in the middle segment is in the NW-SE direction,indicating a localized area of closed down or locked up with consistent *** in the south segment,it presents a disordered pattern,signifying complex deep tectonics and stress conditions at the wedged intersection *** the middle-lower crust in the north and south segments of the RRF,the azimuthal anisotropy is strong and consistent with the spatial strike of the weak zone characterized by low-velocity and *** suggests a connection between the anisotropy and the material migration.(2)In the whole crustal scale,the fast wave directions in two sides of the RRF are consistent with the NW-SE tectonic *** indicates that the RRF,as a large fault potentially cutting through the whole crust,strongly controls the surrounding media.(3)In the lithospheric scale,the fast wave polarizations are oriented nearly E-W and independent of the fault strike,consistent with the low P-and S-wave velocity structures and positive radial anisotropy in the upper *** fast wave directions could be related to lithospheric olivine deformation and asthenospheric *** paper suggests a decoupling of deformation between the crust and the lithospheri

关键词： Red River fault Seismic anisotropy Geological structures Lithosphere Fault segmentation

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