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Piezoelectric-enhanced n-TiO2/baTiO3/p-TiO2 heterojunction for highly efficient photoelectrocatalysis

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Green Energy & Environment 2024年第9期9卷 1466-1476页

作者： Minhua Ai Zihang Peng Xidi Li Faryal Idrees Xiangwen Zhang ji-Jun Zou Lun Pan Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and Technology Tianjin University Collaborative Innovative Center of Chemical Science and Engineering (Tianjin) Haihe Laboratory of Sustainable Chemical Transformations Department of Physics University of the Punjab Quaid-e-Azam Campus

Charge separation is critical for achieving efficient solar-to-hydrogen conversion,whereas piezoelectric-enhanced photoelectrochemical（PEC） systems can effectively modulate band bending and charge ***,we design an n-Ti O2/ba Ti O3/p-Ti O2（TBTm） heterojunction in which the piezoelectric ba Ti O3layer is sandwiched between n-Ti O2and p-Ti *** built-in electric field of TBTm can provide a strong driving force to accelerate carrier separation and prolong carrier ***,the TBT3 achieves a prominent photocurrent density,as high as 2.13 m A cm-2at 1.23 V versus reversible hydrogen electrode （RHE）,which is 2.4-and 1.5-times higher than Ti O2and Ti O2–ba Ti O3heterojunction,*** by mechanical deformation,the induced dipole polarization can further regulate built-in electric fields,and the piezoelectric photocurrent density of TBT3-800 is 2.84 times higher than Ti O2at 1.23 V *** due to the construction of *** work provides a piezoelectric polarization strategy for modulating the built-in electric field of heterojunction for PEC system.

关键词： Photoelectrochemical Piezoelectric polarization Heterojunction Charge separation

基于FK-FE混合方法的位错点源作用下全过程结构地震反应模拟

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工程力学 2024年第4期41卷 184-198页

作者：巴振宁鲁世斌付继赛梁建文芦燕中国地震局地震工程综合模拟与城乡抗震韧性重点实验室天津300354 天津大学土木工程系天津300354

基于区域缩减思想,集整基于精确动力刚度矩阵的频率波数域(FK)半解析方法和有限元(FE)数值方法各自优势(FK精确高效模拟一维波速结构地震波传播;FEM具有丰富单元和本构类型,可精细模拟工程结构地震反应),提出了一种从震源到工程结构全... 详细信息

基于区域缩减思想,集整基于精确动力刚度矩阵的频率波数域(FK)半解析方法和有限元(FE)数值方法各自优势(FK精确高效模拟一维波速结构地震波传播;FEM具有丰富单元和本构类型,可精细模拟工程结构地震反应),提出了一种从震源到工程结构全过程地震反应模拟的FK-FE混合方法。并将FK代码作为插件二次开发到大型商业有限元软件AbaQUS中,实现了AbaQUS平台下从震源到工程结构的全过程宽频地震反应物理模拟。验证了FK-FE混合方法正确性,进而将其应用于位错点源作用下美国SAC机构设计的9层Benchmark抗弯钢框架结构全过程0 Hz~15 Hz宽频地震反应模拟,重点探讨了地壳层波速结构和近地表场地条件对框架结构地震反应的影响。研究表明:地壳层速度结构和场地类别对该结构的地震反应均有显著影响,地壳层速度结构3(较硬)相比速度结构1(较软),结构最大位移和层间位移角分别减小了22.7%和62.0%;Ⅱ类场地相较于Ⅳ类场地,结构最大位移和层间位移角分别减小了22.3%和44.7%。

关键词：地震反应位错点源 FK-FE混合方法区域缩减全过程模拟

Correlation between hydration properties and electrochemical performances on Ln cation size effect in layered perovskite for protonic ceramic fuel cells

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Journal of Energy Chemistry 2024年第1期88卷 1-9,I0001页

作者： Inhyeok Cho jiwon Yun Boseok Seong Junseok Kim Sun Hee Choi Ho-Il ji Sihyuk Choi Department of Mechanical Engineering Kumoh National Institute of TechnologyGumi 39177GyeongbukRepublic of Korea Department of Aeronautics Mechanical and Electronic Convergence EngineeringKumoh National Institute of TechnologyGumi 39177GyeongbukRepublic of Korea Center for Energy Materials Research Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Center for Hydrogen and Fuel Cell Research Clean Technology Research DivisionKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Energy and Environmental Engineering University of Science and TechnologySeoul 02792Republic of Korea Nanomaterials Science and Engineering Korea University of Science and Technology(UST)KIST CampusSeoul 02792Republic of Korea

Prba_(0.5)Sr_(0.5)Co_(1.5)Fe_(0.5)O_(5+δ)(PrBSCF) has attracted much research interest as a potential triple ionic and electronic conductor(TIEC) electrode for protonic ceramic fuel cells(PCFCs). The chemical formula for Pr BSCF is AA'B_(2)O_(5+δ), with Pr(A-site) and ba/Sr(A'-site) alternately stacked along the c-axis. Due to these structural features, the bulk oxygen ion diffusivity is significantly enhanced through the disorder-free channels in the PrO layer;thus, the A site cations(lanthanide ions) play a pivotal role in determining the overall electrochemical properties of layered perovskites. Consequently, previous research has predominantly focused on the electrical properties and oxygen bulk/surface kinetics of Ln cation effects,whereas the hydration properties for PCFC systems remain unidentified. Here, we thoroughly examined the proton uptake behavior and thermodynamic parameters for the hydration reaction to conclusively determine the changes in the electrochemical performances depending on Lnba_(0.5)Sr_(0.5)Co_(1.5)Fe_(0.5)O_(5+δ)(LnBSCF,Ln=Pr, Nd, and Gd) cathodes. At 500 ℃, the quantitative proton concentration of PrBSCF was 2.04 mol% and progressively decreased as the Ln cation size decreased. Similarly, the Gibbs free energy indicated that less energy was required for the formation of protonic defects in the order of Pr BSCF date the close relationship between hydration properties and electrochemical performances in LnBSCF cathodes, PCFC single cell measurements and analysis of the distribution of relaxation time were further investigated.

关键词： Protonic ceramic fuel cell Cathode Triple ionic and electronic conductor Hydration property Proton uptake Gibbs free energy

Impacts of Aggregation Methods and Trophospecies Number on the Structure and Function of Marine Food Webs

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Journal of Ocean University of China 2024年第1期23卷 190-198页

作者： LI Pengcheng ZHANG Chongliang XU Binduo ji Yupeng LI Fan REN Yiping XUE Ying Laboratory of Fisheries Ecosystem Monitoring and Assessment College of FisheriesOcean University of ChinaQingdao 266003China Field Observation and Research Station of Haizhou bay Fishery Ecosystem Ministry of EducationQingdao 266003China Shandong Marine Resources and Environment Research Institute Shandong Provincial Key Laboratory of Restoration for Marine EcologyYantai 264006China Laboratory for Marine Fisheries Science and Food Production Processes Laoshan LaboratoryQingdao 266237China

Aggregation of species with similar ecological properties is one of the effective methods to simplify food web ***,species aggregation will affect not only the complexity of modeling process but also the accuracy of models’*** of aggregation methods and the number of trophospecies are the keys to study the simplification of food *** this study,three aggregation methods,including taxonomic aggregation(ta),structural equivalence aggregation(SEA),and self-organizing maps(SOM),were analyzed and compared with the linear inverse model–Markov Chain Monte Carlo(LIM-MCMC)*** of aggregation methods and trophospecies number on food webs were evaluated based on the robustness and unitless of ecological net-work *** showed that aggregation method of SEA performed better than the other two methods in estimating food web structure and function *** effects of aggregation methods were driven by the differences in species aggregation principles,which will alter food web structure and function through the redistribution of energy *** to the results of mean absolute percentage error(MAPE)which can be applied to evaluate the accuracy of the model,we found that MAPE in food web indices will increase with the reducing trophospecies number,and MAPE in food web function indices were smaller and more stable than those in food web structure ***,trade-off between simplifying food webs and reflecting the status of ecosystem should be con-sidered in food web *** findings highlight the importance of aggregation methods and trophospecies number in the analy-sis of food web *** study provided a framework to explore the extent to which food web models are affected by dif-ferent species aggregation,and will provide scientific basis for the construction of food webs.

关键词： LIM-MCMC model species aggregation trophospecies number aggregation methods food web indices

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页岩中结核类型及成因研究

中国矿业 2024年第S1期33卷 631-633页

作者：秦凤蕊季少聪巴俊杰中国地质科学院岩溶地质研究所广西桂林541004 自然资源部广西岩溶动力学重点实验室广西桂林541004 联合国教科文组织国际岩溶研究中心广西桂林541004 广西岩溶资源环境工程技术研究中心广西桂林541004

结核是页岩中十分常见又复杂的一种沉积构造,其成分、结构、颜色等与围岩截然不同,在揭示构造活动、古环境、古物源和成岩作用等方面具有重要意义。因此,通过对结核的概念、页岩中结核类型、成因及地质意义等方面进行总结,为页岩成因研... 详细信息

结核是页岩中十分常见又复杂的一种沉积构造,其成分、结构、颜色等与围岩截然不同,在揭示构造活动、古环境、古物源和成岩作用等方面具有重要意义。因此,通过对结核的概念、页岩中结核类型、成因及地质意义等方面进行总结,为页岩成因研究提供参考。

关键词：黑色页岩结核成因

Thermodynamics-directed bulk/grain-boundary engineering for superior electrochemical durability of Ni-rich cathode

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Journal of Energy Chemistry 2024年第10期97卷 321-331页

作者： Kangyu Zou Mingzhu jiang Tianxiang Ning Lei tan Junchao Zheng jiexi Wang Xiaobo ji Lingjun Li School of Materials Science and Engineering Changsha University of Science and Technology School of Metallurgy and Environment Central South University National Engineering Research Centre of Advanced Energy Storage Materials College of Chemistry and Chemical Engineering Central South University

Introducing high-valence ta element is an essential strategy for addressing the structu ral deterioration of the Ni-rich LiNi1-x-yCoxMnyO2（NCM） cathode,but the enlarged Li/Ni cation mixing leads to the inferior rate capability originating from the hindered Li+*** that the non-magnetic Ti4+ion can suppress Li/Ni disorder by removing the magnetic frustration in the transition metal ***,it is still challenging to directionally design expected ta/Ti dual-modification,resulting from the complexity of the elemental distribution and the uncertainty of in-situ formed coating compounds by introducing foreign ***,a LitaO3grain boundary（GB） coating and bulk Ti-doping have been successfully achieved in LiNi0.834Co0.11Mn0.056O2cathode by thermodynamic guidance,in which the structural formation energy and interfacial binding energy are employed to predict the elemental diffusion discrepancy and thermodynamically stable coating *** to the coupling effect of strengthened structural/interfacial stability and improved Li+diffusion kinetics by simultaneous bulk/GB engineering,the ta/Ti-NCM cathode exhibits outstanding capacity retention,reaching 91.1% after 400 cycles at 1 *** elaborate work contributes valuable insights into rational dual-modification engineering from a thermodynamic perspective for maximizing the electrochemical performances of NCM cathodes.

关键词： Bulk doping Dual-modification Grain boundary coating Ni-rich layered cathode Thermodynamic perspective

基于地质建造的岷江上游干旱河谷区下段土壤特征和植被时空变化

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现代地质 2024年第3期38卷 660-673页

作者：周雪妮巴仁基肖成志曹亚廷计扬中国地质调查局军民融合地质调查中心四川成都610036 自然资源要素耦合过程与效应重点实验室北京100055 成都理工大学环境与土木工程学院四川成都610059 中国地质大学(武汉)地球物理与空间信息学院湖北武汉430074

为探讨岷江上游干旱河谷区地质建造对土壤性质的控制以及对植被分布的制约,支撑生态保护修复分区治理工作,本文以岷江上游干旱河谷区下段为研究区,采用地质建造调查、元素分析测试和遥感解译方法,结合土地利用数据,从地质建造类型、土... 详细信息

为探讨岷江上游干旱河谷区地质建造对土壤性质的控制以及对植被分布的制约,支撑生态保护修复分区治理工作,本文以岷江上游干旱河谷区下段为研究区,采用地质建造调查、元素分析测试和遥感解译方法,结合土地利用数据,从地质建造类型、土壤特征、土地利用和植被覆盖度方面分析地质建造单元对土壤和植被的影响。结果表明:第四纪松散堆积建造区土壤层厚、养分丰富,由于人类活动改造作用较强,区内植物种类以经济作物为主;三叠纪复理石建造区土壤层较厚,养分丰富,基岩构造裂隙较发育,富水性较好,适宜灌木和少量乔木生长,该区植被覆盖度高;泥盆纪泥页岩-碳酸盐岩建造土壤层较厚、土壤钙等养分含量高,分布大量喜钙侧柏;志留纪泥砂质-碳酸盐建造区区发育非贯穿性裂隙,受构造作用影响浅表层的岩石风化破碎程度高,水土极易流失,以低矮灌木和草地为主;元古宙中酸性岩浆岩建造区土壤层薄,裂隙发育,土壤中磷等养分含量较高,土壤层含水率最低,以灌丛植物生长为主;中元古代火山岩-熔岩建造区发育闭合状裂隙,含水性差,仅适合灌草丛生长,植被覆盖度偏低。

关键词：地质建造土壤特征植被覆盖度时空演变干旱河谷

Opinions of Students on the Contribution of the DIVA 3D Virtual Dissection table to the Teaching of Anatomy at the Faculty of Medicine and Odontostomatology of bamako

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Forensic Medicine and Anatomy Research 2024年第2期12卷 13-25页

作者： Abdoulaye Kanté tata Touré Ousmane Toumany Chérif Haidara Uhl Jean François Mariam daou Mamadou A. Keita bakary Keïta Bréhima Bengaly Drissa Traoré Adégné Togo Nouhoum Ongoïba Faculty of Medicine and Odontostomatology of bamako Bamako Mali University of Paris Descartes Paris France Department of Neurology The Gabriel Tour&#233 University Hospital Bamako Mali Department of General Surgery The Kati Health Center Bamako Mali Anesthesia-Resuscitation Service Commune I Reference Health Center Bamako Bamako Mali Department of General Surgery The Gabriel Tour&#233 University Hospital Bamako Mali

Objective: Study the contribution of the DIVA 3D dissection table in the teaching of anatomy at the Faculty of Medicine and Odontology of bamako. Material and Methods: This was a qualitative study carried out from November 1 to December 30, 2023 at the clinical and morphological anatomy laboratory of the Faculty of Medicine and Odontostomatology of bamako. Included in this study were students who participated in practical and tutorial sessions. The variables studied during this study were: the previous performance of dissection on a cadaver by the students, the opinion of the students on dissection on a cadaver, the replacement of dissection on a cadaver by virtual dissection in the absence of a body, the level student satisfaction. Results: We surveyed 130 participants. The average age was 22 ± 0.2 years with extremes of 17 and 29 years. 95.3% of participants were students. According to 66.7% of participants, virtual dissection is a good palliative in the absence of a corpse. 95.3% of participants found using the virtual dissection table easy with an average of 7.88 ± 1.4. The overall assessment was well rated by 99.3% of participants. Conclusion: According to the results of this study, the virtual dissection table should be improved by integrating commented videos. The use of the DIVA 3D virtual dissection table during practical and tutorial sessions is well appreciated by the students. We believe that the teaching of anatomy using 3D digital technology should be included in the study programs of the Faculty of Medicine and Odontostomatology.

关键词： Student Opinion Contribution DIVA 3D Virtual Dissection table Anatomy Teaching FMOS

摩尔比对MMOS水泥力学性能和变形行为的影响及机理

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建筑材料学报 2024年第8期27卷 733-743页

作者：巴明芳马哲洋纪璐鑫崔嘉铭柳俊哲宁波大学土木工程与地理环境学院浙江宁波315211 青岛农业大学建筑工程学院山东青岛266109

研究了原材料摩尔比(n(MgO)∶n(MgSO_(4))∶n(H_(2)O))对改性硫氧镁(MMOS)水泥力学性能和变形行为的影响,并采用X射线衍射仪(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱(FTIR)及热重分析(TG)等测试技术对其机理进行分析.结果表明:MMOS水... 详细信息

研究了原材料摩尔比(n(MgO)∶n(MgSO_(4))∶n(H_(2)O))对改性硫氧镁(MMOS)水泥力学性能和变形行为的影响,并采用X射线衍射仪(XRD)、扫描电镜(SEM)、傅里叶变换红外光谱(FTIR)及热重分析(TG)等测试技术对其机理进行分析.结果表明:MMOS水泥的抗压强度和抗折强度随着水硫比和氧硫比的提高均呈提升趋势.其中原材料摩尔比为10∶1∶12时,水泥力学性能最优.不同摩尔比MMOS水泥在56d龄期内均呈膨胀变形,其中总变形随水硫比和氧硫比的提高呈减小趋势;自收缩变形随水硫比的提高而减小,随氧硫比的提高呈先增后减趋势.这主要是由于硬化后不同摩尔比MMOS水泥中的水化产物Mg(OH)_(2)和5·1·7相(5Mg(OH)_(2)·MgSO_(4)·7H_(2)O)含量各有不同.当Mg(OH)_(2)含量减少,而5·1·7相含量增加时,MMOS水泥的膨胀变形量降低,同时其抗折强度和抗压强度有所提升.

关键词：摩尔比改性硫氧镁水泥力学性能体积变形机理分析