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Unveiling the Contribution of Lactic Acid to the Passivation Behavior of ti-6Al-4V Fabricated by Laser Powder Bed Fusion in Hank’s Solution

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 102-118页

作者： Yu-Hang Chu Liang-Yu Chen Bo-Yuan Qin Wenbin Gao Fanmin Shang Hong-Yu yang Lina Zhang Peng Qin Lai-Chang Zhang School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212100China Foshan(Southern China)Institute for New Materials Foshan528200China Key Laboratory of Automobile Materials Ministry of Education and Department of Materials Science and EngineeringJilin UniversityChangchun130025China Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

In actual physiological environments,bacteria can activate the immune system and release lactic ***,the detailed contribution of lactic acid to the passivation behavior of titanium(ti)alloys is still *** current work investigated the in vitro passivation behavior of ti-6Al-4V(TC4)alloys fabricated by laser powder bed fusion in Hank's solution with and without adding lactic *** methods,inductively coupled plasma atomic emission spectrometer,and X-ray photoelectron spectroscopy were jointly *** lactic acid decreases the corrosion resistance of samples by degrading the formed passive *** film formed in the(lactic acid)-containing solution exhibits a higher level of oxygen vacancies and a lower thickness,attributed to the suppressed formation of ti^(4+)transformed from ti^(3+)and ti^(2+).Moreover,the presence of lactic acid would increase the open circuit potential,relieve the ions release,and hinder the deposition of calcium phosphates within 24 h immersion.

关键词： titanium alloy Corrosion behavior Passive film Lactic acid Laser powder bed fusion

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西方社会学消费理论的经济学评析

消费经济 2006年第1期22卷 89-92,94页

作者：杨天宇中国人民大学公共管理学院北京100872

与经济学中的“代表性消费者”假设不同,社会学强调从社会分层的角度研究消费问题。本文对社会学家韦伯的阶层地位消费假说、西美尔的模仿消费理论、凡勃伦的炫耀性消费理论、布迪厄的资本-场域-惯习分析框架进行了述评,指出了他们的缺... 详细信息

与经济学中的“代表性消费者”假设不同,社会学强调从社会分层的角度研究消费问题。本文对社会学家韦伯的阶层地位消费假说、西美尔的模仿消费理论、凡勃伦的炫耀性消费理论、布迪厄的资本-场域-惯习分析框架进行了述评,指出了他们的缺陷和对于经济学家的可资借鉴之处,并提出了经济学消费理论的进一步发展方向。

关键词：社会学消费理论社会分层

A facile strategy for large-scale production of 2D nanosheets exfoliated by three-roll milling

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Journal of Advanced Ceramics 2024年第1期13卷 11-18页

作者： Xin Wang yang Xia Juntong Huang Yao Su Zhi Chen Linlin Chen Zhaohui Wu Zhijun Feng Huiyong yang Xibao Li School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China

Two-dimensional(2D)nanomaterials,such as graphene,MoS_(2),and MAX,have attracted increasing research attention in recent years due to their unique structural and performance ***,their complex production processes and equipment requirements are significant issues affecting their widespread ***,with an exfoliation strategy using three-roll milling,we present a simple,cost-effective,and extensible method to produce multilayer graphene,BN,MoS_(2),and ti_(3)AlC_(2) *** roller and phenolic resin created three kinds of forces on the layered 2D materials,i.e.,shear forces,compressive forces,and adhesive forces,which exfoliated layered materials from their edges and surfaces into ***,the exfoliated materials were ultrasonically washed with alcohol,treated with ultrasonic vibration,and centrifuged to obtain 2D *** easy operation and high yield are attractive for research based on the construction of high-performance 2D nanosheet-based devices at low ***,the obtained multilayer graphene and MoS_(2) nanosheets were used as anode materials of sodium/potassium-ion batteries,respectively,to test their electrochemical *** performances are obtained compared with their primary bulk materials.

关键词： two-dimensional(2D)nanosheets exfoliation three-roll milling(TRM) sodium/potassium-ion batteries

Strong metal–support interaction boosts the electrocatalytic hydrogen evolution capability of Ru nanoparticles supported on titanium nitride

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Carbon Energy 2024年第1期6卷 245-254页

作者： Xin Wang Xiaoli yang Guangxian Pei Jifa yang Junzhe Liu Fengwang Zhao Fayi Jin Wei Jiang Haoxi Ben Lixue Zhang College of Chemistry and Chemical Engineering Collaborative Innovation Center for Hydrogen Energy Key Materials and Technologies of Shandong ProvinceQingdao UniversityQingdaoShandongChina State Key Laboratory of Bio-fibers and Eco-Textiles Qingdao UniversityQingdaoShandongChina Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of ScienceQingdaoShandongChina

Ruthenium(Ru)has been regarded as one of the most promising alternatives to substitute Pt for catalyzing alkaline hydrogen evolution reaction(HER),owing to its inherent high activity and being the cheapest platinum-group ***,based on the idea of strong metal–support interaction(SMSI)regulation,Ru/tiN catalysts with different degrees of tiN overlayer over Ru nanoparticles were fabricated,which were applied to the alkaline electrolytic *** reveal that the tiN overlayer would gradually encapsulate the Ru nanoparticles and induce more electron transfer from Ru nanoparticles to tiN support by the Ru–N–ti bond as the SMSI degree *** study shows that the exposed Ru–tiN interfaces greatly promote the H_(2) desorption ***,the Ru/tiN-300 with a moderate SMSI degree exhibits excellent HER performance,with an overpotential of 38 mV at 10 mA cm^(−2).Also,due to the encapsulation role of tiN overlayer on Ru nanoparticles,it displays super long-term stability with a very slight potential change after 24 *** study provides a deep insight into the influence of the SMSI effect between Ru and tiN on HER and offers a novel approach for preparing efficient and stable HER electrocatalysts through SMSI engineering.

关键词： electronic structure hydrogen evolution reaction ruthenium strong metal-support interaction titanium nitride

Interface sites on vanadia-based catalysts are highly active for NO_(x) removal under realistic conditions

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Journal of Environmental Sciences 2024年第2期136卷 523-536页

作者： Zhihui Lv Guangzhi He Wenshuo Zhang Jingjing Liu Zhihua Lian yang yang Zidi Yan Guangyan Xu Wenpo Shan Yunbo Yu Hong He State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou 341000China Ningbo Research Center for Urban Environment Chinese Academy of SciencesNingbo 315800China

tiO_(2)-supported V_(2)O_(5)catalysts are commonly used in NO_(x)reduction with ammonia due to their robust catalytic *** these catalysts,it is generally considered that the active species are mainly derived from the vanadia species rather than the intrinsic structure of V-O-ti entities,namely the interface *** reveal the role of V-O-ti entities in NH_(3)-SCR,herein,we prepared tiO_(2)/V_(2)O_(5)catalysts and demonstrated that V-O-ti entities were more active for NO_(x)reduction under wet conditions than the V sites(V=O)working *** the V-O-ti entities,kinetic measurements and first principles calculations revealed that NH_(3)activation exhibited a much lower energy barrier than that on V=O *** wet conditions,the V-O-ti interface significantly inhibited the transformation of V=O to V-OH sites thus benefiting NH_(3)*** wet conditions,meanwhile,the migration of NH_(4)^(+)from ti site neighboring the V-O-ti interface to ti site of the V-O-ti interface was exothermic;thus,V-O-ti entities together with neighboring ti sites could serve as channels linking NH_(3)pool and active centers for activation of NH_(4)^(+).This finding reveals that the V-O-ti interface sites on V-based catalysts play a crucial role in NO_(x)removal under realistic conditions,providing a new perspective on NH_(3)-SCR mechanism.

关键词： NO_(x)removal Vanadia-based catalysts V-O-ti entities Interface sites Reaction mechanism

A general descriptor for guiding the electrolysis of CO_(2)in molten carbonate

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Green Energy & Environment 2024年第4期9卷 748-757页

作者： Zhengshan yang Bowen Deng Kaifa Du Huayi Yin Dihua Wang School of Resource and Environmental Sciences Hubei International Scientific and Technological Cooperation Base of Sustainable Resource and EnergyWuhan UniversityWuhan430072China

Molten carbonate is an excellent electrolyte for the electrochemical reduction of CO_(2)to carbonaceous ***,the electrolyte–electrode-reaction relationship has not been well ***,we propose a general descriptor,the CO_(2)activity,to reveal the electrolyte–electrode-reaction relationship by thermodynamic calculations and experimental *** studies agree well with theoretical predictions that both cations(Li^(+),Ca^(2+),Sr^(2+)and Ba^(2+))and anions(BO_(2)^(-),ti_(5)O_(14)^(8-),SiO_(3)^(2-))can modulate the CO_(2)activity to control both cathode and anode reactions in a typical molten carbonate electrolyzer in terms of tuning reaction products and *** this regard,the reduction of CO_(3)^(2-)can be interpreted as the direct reduction of CO_(2)generated from the dissociated CO_(3)^(2-),and the CO_(2)activity can be used as a general descriptor to predict the electrode reaction in molten ***,the CO_(2)activity descriptor unlocks the electrolyte–electrode-reaction relationship,thereby providing fundamental insights into guiding molten carbonate CO_(2)electrolysis.

关键词： Molten carbonate CO_(2)activity CO_(2)RR Electrolyte engineering Carbon

不同土地利用情景下天津市生态系统服务及权衡与协同分析

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北京林业大学学报 2022年第5期44卷 77-85页

作者：王猛提杨王家栋赵秋璐胡志良栾晓峰北京林业大学生态与自然保护学院北京100083 天津市城市规划设计研究总院有限公司天津300110

【目的】土地利用变化是导致生态系统服务及其关系变化的重要影响因素,探讨土地利用变化对生态系统服务影响具有重要意义。【方法】本研究基于2000和2015年天津市土地利用数据,结合区域发展规划,采用GeoSOS-FLUS模型预测2030年3种不同... 详细信息

【目的】土地利用变化是导致生态系统服务及其关系变化的重要影响因素,探讨土地利用变化对生态系统服务影响具有重要意义。【方法】本研究基于2000和2015年天津市土地利用数据,结合区域发展规划,采用GeoSOS-FLUS模型预测2030年3种不同情景下的土地利用格局,并利用InVEST模型评估生态系统服务及权衡/协同关系。【结果】(1)2015-2030年,自然发展情景下城市继续扩张,建设用地增加27.68%,耕地下降11.47%。生态规划情景下城市扩张减缓,建设用地增加7.97%,林地、草地、水域和灌丛共增加2.02%。城市快速发展情景下建设用地和耕地基本保持稳定,水域面积增加4.78%。(2)2015-2030年不同情景下天津市综合生态系统服务指数均呈现下降趋势,其中自然发展、生态规划和城市快速发展情景下综合生态系统服务指数分别为0.172、0.181、0.180。(3)2015-2030年不同情景下4种生态系统服务的权衡/协同关系方向未变,但强弱发生了复杂的变化,总体上生态规划情景下协同关系更强,自然发展情景下协同关系更弱。【结论】本研究建议天津市未来应控制城市扩张速度、优化当前土地利用结构、增强生态环境建设。研究结果可为天津市生态系统管理提供理论基础。

关键词：天津市 GeoSOS-FLUS模型 InVEST模型生态系统服务权衡协同

Oxygen vacancy boosting Fenton reaction in bone scaffold towards fighting bacterial infection

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International Journal of Extreme Manufacturing 2024年第1期6卷 296-311页

作者： Cijun Shuai Xiaoxin Shi Feng yang Haifeng tian Pei Feng State Key Laboratory of Precision Manufacturing for Extreme Service Performance College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083People’s Republic of China Institute of Additive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013People’s Republic of China College of Mechanical Engineering Xinjiang UniversityUrumqi 830017People’s Republic of China

Bacterial infection is a major issue after artificial bone transplantation due to the absence of antibacterial function of bone scaffold,which seriously causes the transplant failure and even amputation in severe *** this study,oxygen vacancy(OV)defects Fe-doped ti O2(OV-FetiO2)nanoparticles were synthesized by nano tiO2and Fe3O4via high-energy ball milling,which was then incorporated into polycaprolactone/polyglycolic acid(PCLGA)biodegradable polymer matrix to construct composite bone scaffold with good antibacterial activities by selective laser *** results indicated that OV defects were introduced into the core/shell-structured OV-FetiO2nanoparticles through multiple welding and breaking during the high-energy ball milling,which facilitated the adsorption of hydrogen peroxide(H2O2)in the bacterial infection microenvironment at the bone transplant *** accumulated H2O2could amplify the Fenton reaction efficiency to induce more hydroxyl radicals(·OH),thereby resulting in more bacterial deaths through·OH-mediated oxidative *** antibacterial strategy had more effective broad-spectrum antibacterial properties against Gram-negative Escherichia coli(***)and Gram-positive Staphylococcus aureus(***).In addition,the PCLGA/OV-FetiO2scaffold possessed mechanical properties that match those of human cancellous bone and good biocompatibility including cell attachment,proliferation and osteogenic differentiation.

关键词： bacterial infection bone scaffold selective laser sintering Fenton reaction antibacterial properties

应用圆二色光谱研究电场对脂肪酶二级结构的影响

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光谱学与光谱分析 2006年第12期26卷 2311-2314页

作者：姚占全敖敦格日勒许强杨体强内蒙古大学理工学院

脂肪酶被不同强度的电场处理5min，用圆二色光谱（circular dichroism，CD）研究电场对脂肪酶（Lipase）二级结构的影响。研究结果表明：在0．5～6．0kV·cm^-1范围内，不同强度的电场对脂肪酶的α-螺旋、β-折叠、β-转角及无规卷曲相... 详细信息

脂肪酶被不同强度的电场处理5min，用圆二色光谱（circular dichroism，CD）研究电场对脂肪酶（Lipase）二级结构的影响。研究结果表明：在0．5～6．0kV·cm^-1范围内，不同强度的电场对脂肪酶的α-螺旋、β-折叠、β-转角及无规卷曲相对含量的影响程度不同。随场强的增加，各二级结构单元含量呈非单调变化。电场作用可使脂肪酶二级结构中α-螺旋、β-折叠、β-转角及无规卷曲发生转化。总体上，电场使脂肪酶的二级结构由α-螺旋、β-折叠向转角及无规卷曲转化。α-螺旋含量和β-折叠的含量降低幅度分别为4．6％～48．0％和13．2％～35．1％，β-转角含量与无规卷曲含量增加幅度分别为2．8％～33．3％和0．9％～48．1％。文章结果对研究电场处理植物种子的宏观生物效应作用机理提供了重要理论依据。

关键词：电场脂肪酶圆二色谱二级结构