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Corrosion behavior of Gd_(2)Zr_(2)O_(7)thermal barrier coatings under Fe-containing environmental sediment attack

Journal of Advanced Ceramics 2024年第4期13卷 447-462页

作者： Lei Guo yanyan Li kai yan School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Advanced Joining Technology Key Lab of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin 300072China Key Laboratory of Special Equipment Safety and Energy-saving for State Market Regulation China Special Equipment Inspection&Research InstituteBeijing 100029China

Environmental sediments mainly consisting of CaO–MgO–Al_(2)O_(3)–SiO_(2)(CMAS)corrosion are a serious threat to thermal barrier coatings(TBCs),in which Fe element is usually ignored.Gd_(2)Zr_(2)O_(7)TBCs are famous for their excellent CMAS resistance.In this study,the characteristics of Fe-containing environmental sediments(CMAS-Fe)and their corrosiveness to Gd_(2)Zr_(2)O_(7)coatings were investigated.Four types of CMAS-Fe glass with different Fe contents were fabricated.Their melting points were measured to be 1322–1344℃,and the high-temperature viscosity showed a decreasing trend with increasing Fe contents.The corrosion behavior of four types of CMAS-Fe to Gd_(2)Zr_(2)O_(7)coatings at 1350℃was investigated.At the initial corrosion stage(0.1 h),anorthite was precipitated in CMAS-Fe with a high Ca:Si ratio,while Fe-garnet was formed in the melt with the highest Fe content.Prolonging the corrosion time resulted in the formation of a reaction layer,which exhibited an interpenetrating network composed of Gd-oxyapatite,ZrO_(2),and residual CMAS-Fe.Some spinel was precipitated within the reaction layer.After 1 h or even longer time,the reaction layers tended to be stable and compact,which had comparable hardness and fracture toughness to those of Gd_(2)Zr_(2)O_(7)coatings.Under the cyclic CMAS-Fe attack,the residual CMAS-Fe in the interpenetrating network provided a pathway for the redeposited CMAS-Fe infiltration,resulting in the continuous growth of the reaction layer.As a result,the Gd_(2)Zr_(2)O_(7)coatings had a large consumption in the thickness,degrading the coating performance.Therefore,the Gd_(2)Zr_(2)O_(7)coatings exhibit unsatisfactory corrosion resistance to CMAS-Fe attack.

关键词： thermal barrier coatings(TBCs) Gd_(2)Zr_(2)O_(7) Fe-containing CaO-MgO-Al2O3-SiO_(2)(CMAS) corrosion resistance reaction layer

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Self-templating synthesis of biomass-based porous carbon nanotubes for energy storage and catalytic degradation applications

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Green Energy & Environment 2024年第3期9卷 584-595页

作者： Manman Xu Shiqi Fu Yukai Wen Wei Li Qiongfang Zhuo Haida Zhu Zhikeng Zheng Yuwen Chen Anqi Wang kai yan Research Centre for Eco-Environmental Engineering School of Environment and Civil EngineeringDongguan University of TechnologyDongguan523808China School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou510275China

Dwindling energy sources and a worsening environment are huge global problems,and biomass wastes are an under-exploited source of material for both energy and material generation.Herein,self-template decoction dregs of Ganoderma lucidum-derived porous carbon nanotubes(ST-DDLGCs)were synthesized via a facile and scalable strategy in response to these challenges.ST-DDLGCs exhibited a large surface area(1731.51 m^(2)g^(-1))and high pore volume(0.76 cm^(3)g^(-1)),due to the interlacing tubular structures of precursors and extra-hierarchical porous structures on tube walls.In the ST-DDLGC/PMS system,the degradation efficiency of capecitabine(CAP)reached~97.3%within 120 min.Moreover,ST-DDLGCs displayed high catalytic activity over a wide pH range of 3–9,and strong anti-interference to these typical and ubiquitous anions in wastewater and natural water bodies(i.e.,H_(2)PO_(4)^(-),NO_(3)^(-),Cl^(-) and HCO_(3)^(-)),in which a ^(1)O_(2)-dominated oxidation was identified and non-radical mechanisms were deduced.Additionally,ST-DDLGC-based coin-type symmetrical supercapacitors exhibited outstanding electrochemical performance,with specific capacitances of up to 328.1 F g^(-1)at 0.5 A g^(-1),and cycling stability of up to 98.6%after 10,000 cycles at a current density of 2 A g^(-1).The superior properties of ST-DDLGCs could be attributed to the unique porous tubular structure,which facilitated mass transfer and presented numerous active sites.The results highlight ST-DDLGCs as a potential candidate for constructing inexpensive and advanced environmentally functional materials and energy storage devices.

关键词： Ganoderma lucidum residue Porous carbon nanotubes Self-template method Wastewater treatment Supercapacitor electrode

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Evaluating the thermal environment of urban land surfaces in Yakutsk,a city located in a region of continuous permafrost

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Advances in Climate Change Research 2024年第1期15卷 113-123页

作者： Xiang-Long LI Ze ZHANG Jin-Xin LU Anatoli BROUCHKOV Qing-kai yan Qi-Hao YU Sheng-Rong ZHANG Andrey MELNIKOV School of Civil Engineering and Transportation Institute of Cold Regions Science and EngineeringPermafrost InstituteNortheast Forestry UniversityHarbin150040China China Railway Qinghai-Tibet Group Company Xining 810000China Department of Geocryology Faculty of GeologyLomonosov Moscow State UniversityMoscow 119234Russian Federation State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco Envi ronment and Re sourcesChinese Academy of SciencesLanzhou 730000China Melnikov Permafrost Institute Siberian BranchRussian Academy of ScienceYakutsk 677010Russian Federation

Rapid urbanization has led to changes in the urban land surface thermal environment.However,there are still much unknown about the urban land surface thermal conditions in permafrost regions.Permafrost is a unique geological environment,changes in the urban land surface thermal environment may trigger geological disasters caused by permafrost degradation.This study utilized remote sensing data and geographic de-tectors to identify the dynamic changes in land surface temperature(LST)and land use/land cover(LU/LC)in Yakutsk,as well as the potential factors contributing to LST variations.Between 1992 and 2020,the built-up area in Yakutsk increased by 36%,and the annual average LST in Yakutsk has risen by 6.67℃,accompanied by an expansion of high-temperature areas.Despite ongoing greening efforts,rapid urbanization poses a threat to these green spaces.Changes in the normalized difference built-up index(NDBI)and land use transfer(LDT)were identified as the primary drivers of urban LST changes.By integrating geographic detector technology and artificial neural network models,we optimized the selection of input factors in the prediction model and used it to explore the future changes in LST in Yakutsk.The average LST in Yakutsk is expected to reach 23.4℃ and 25.1℃ in 2030 and 2040,respectively,with a further increase in high-temperature areas.This study provides a reference for ecological,hydrological,and geological assessments of cities in permafrost regions.

关键词： Remote sensing Land surface temperature Land use/Land cover Permafrost Yakutsk

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Understanding Bridging Sites and Accelerating Quantum Efficiency for Photocatalytic CO_(2) Reduction

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Nano-Micro Letters 2024年第1期16卷 68-84页

作者： Kangwang Wang Zhuofeng Hu Peifeng Yu Alina M.Balu Kuan Li Longfu Li Lingyong Zeng Chao Zhang Rafael Luque kai yan Huixia Luo School of Materials Science and Engineering State Key Laboratory of Optoelectronic Materials and TechnologiesGuangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesKey Lab of Polymer Composite and Functional MaterialsSun Yat-Sen UniversityNo.135Xingang Xi RoadGuangzhou 510275People’s Republic of China School of Environmental Science and Engineering Sun Yat-Sen UniversityNo.135Xingang Xi RoadGuangzhou 510275People’s Republic of China Departamento de Química Orgánica Universidad de CórdobaCampus Universitario de RabanalesEdificio Marie Curie(C3)14014 CórdobaSpain Center for Refining and Advanced Chemicals King Fahd University of Petroleum and Minerals31261 DhahranSaudi Arabia Universidad ECOTEC Km 13.5 SamborondónEC092302 SamborondónEcuador

We report a novel double-shelled nanoboxes photocatalyst architecture with tailored interfaces that accelerate quantum efficiency for photocatalytic CO_(2) reduction reaction(CO_(2)RR)via Mo–S bridging bonds sites in S_(v)–In_(2)S_(3)@2H–MoTe_(2).The X-ray absorption near-edge structure shows that the formation of S_(v)–In_(2)S_(3)@2H–MoTe_(2) adjusts the coordination environment via interface engineering and forms Mo–S polarized sites at the interface.The interfacial dynamics and catalytic behavior are clearly revealed by ultrafast femtosecond transient absorption,time-resolved,and in situ diffuse reflectance–Infrared Fourier transform spectroscopy.A tunable electronic structure through steric interaction of Mo–S bridging bonds induces a 1.7-fold enhancement in S_(v)–In_(2)S_(3)@2H–MoTe_(2)(5)photogenerated carrier concentration relative to pristine S_(v)–In_(2)S_(3).Benefiting from lower carrier transport activation energy,an internal quantum efficiency of 94.01%at 380 nm was used for photocatalytic CO_(2)RR.This study proposes a new strategy to design photocatalyst through bridging sites to adjust the selectivity of photocatalytic CO_(2)RR.

关键词： Quantum efficiency Electronic structure Steric interaction Bridging sites CO_(2)reduction

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Effects of Exogenous Plant Hormones on Growth Status and Secondary Metabolism of Houttuynia cordata Thunb.

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Medicinal Plant 2024年第1期15卷 1-7,12页

作者： Xitao WANG kai yan Tianhua YU Zhannan yanG Shiqiong LUO Key Laboratory for Information System of Mountainous Areas and Protection of Ecological Environment of Guizhou Province/School of Life Sciences Guizhou Normal UniversityGuiyang 550081China Liupanshui Normal University Liupanshui 553004China

[Objectives]To improve the yield and secondary metabolite content of medicinal plants and to further develop and utilize the medicinal and other functions of medicinal plants.[Methods]We used the sterile tissue culture method with Houttuynia cordata Thunb.as the research object.Different concentrations of 1-naphthalene acetic acid(NAA),auxin(indole-3-acetic acid,IAA)and gibberellin acid(GA_(3))were added to the group culture medium of H.cordata to investigate the effects of exogenous plant hormones on plant height,root length,fresh weight,morphological characteristics,four phenolics and 20 volatile compounds.[Results]The results showed that the exogenous plant hormone of 3 mg/L GA_(3)significantly increased plant height by 79.9%over the control;the exogenous plant hormone of 3 mg/L IAA significantly increased root length by 52.6%over the control;and the exogenous plant hormone of 1 mg/L GA_(3)significantly increased fresh weight of single plant by 458.2%over the control.In the treatment group of 1 mg/L NAA,chlorogenic acid content was significantly increased by 52.6%compared with the control;in the treatment group of 1 mg/L IAA,chlorogenic acid,rutin,isodendrin and quercetin content were significantly increased by 109.1%,100.6%,173.8%,and 198.7%compared with the control,respectively;in the treatment of 3 mg/L GA_(3),chlorogenic acid,rutin,isoquercitin,and quercitin content were significantly increased by 65.3%,104.9%,139.0%and 191.2%over the control.In addition,the content of volatile compounds was significantly higher in all H.cordata treated with exogenous plant hormones of 2 mg/L NAA,1 mg/L IAA,and 3 mg/L GA_(3);however,the content of volatile compounds was lower in all of the treatments with 2 mg/L GA_(3).[Conclusions]Different exogenous plant hormones have certain effects on the growth morphology and secondary metabolic content of H.cordata,which provides theoretical basis and technical support for the development and utilization of medicinal plants.

关键词： 1-Naphthaleneacetic acid(NAA) Auxin(IAA) Gibberellic Acid(GA_(3)) Phenols Volatiles

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Effects of Fungi Fusarium sp. to Rhizosphere Soil and Physiological Characteristics of Camellia oleifera Abel.

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Asian Agricultural Research 2024年第2期16卷 22-30页

作者： Xuejin WANG kai yan Tianhua YU Zhannan yanG Shiqiong LUO Key Laboratory for Information System of Mountainous Areas and Protection of Ecological Environment of Guizhou Province Guizhou Normal UniversityGuiyang 550025China School of Life Science Guizhou Normal UniversityGuiyang 550025China Liupanshui Normal University Liupanshui 553004China

[Objectives]To study the effects of fungi Fusarium sp.to rhizosphere soil and physiological characteristics of Camellia oleifera Abel.[Methods]We investigated the effects of Fusarium sp.to rhizosphere soil nutrient element content and metabolites of C.oleifera.C.oleifera was inoculated with the suspension of Fusarium sp.in pot experiments and ammonium-N,available phosphorus,available potassi-um,organic matter,enzymes and pH of rhizosphere soil,MDA content,activity of SOD,POD of C.oleifera leaves were analyzed.[Results]Fusarium sp.stress significantly inhibited soil enzyme activities and significantly reduced available phosphorus content,especially for phospha-tase and sucrase.Antioxidant enzyme activities in C.oleifera tissues showed that Fusarium sp.stress significantly increased MDA and SOD enzyme activities and decreased POD enzyme activity.Especially,SOD enzyme activity was elevated by 53.86%compared with the CK group.In addition,analysis of the content of major metabolites in C.oleifera leaves showed that Fusarium sp.stress significantly reduced the content of total flavonoids,quercetin,isoquercitrin and isoquercitrin in C.oleifera leaves by 7.80%,50.00%and 75.90%,respectively.[Conclusions]Our results are an important step which showed strong resistance of C.oleifera and can give a novel insight for researches on the effects in the rhizosphere soil enzyme,soil nutrient elements and metabolites of C.oleifera under the Fusarium sp.too.

关键词： Camellia oleifera Abel. Fusarium sp. Antioxidant enzymes Soil enzymes Soil quality

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引入国有资本对民营企业经营绩效的影响及作用机制分析

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上海经济研究 2024年第5期 86-98页

作者：沈开艳刘莎上海社会科学院经济研究所 200020

本文利用2004-2020年间A股上市公司相关数据,使用多期双重差分模型实证研究了引入国有资本对民营企业经营绩效的影响及其作用机制。本文实证结果显示,引入国有资本对民营企业经营绩效具有提升作用;机制分析表明,民营企业通过引入国有资... 详细信息

本文利用2004-2020年间A股上市公司相关数据,使用多期双重差分模型实证研究了引入国有资本对民营企业经营绩效的影响及其作用机制。本文实证结果显示,引入国有资本对民营企业经营绩效具有提升作用;机制分析表明,民营企业通过引入国有资本,优化了与国有金融机构以及政府的关系,通过缓解融资约束、降低融资成本以及获取财政补助等机制形成的“资源效应”,产生了对经营绩效的提升作用。本文的进一步研究发现,引入国有资本后,控制权转移与否会对企业经营绩效表现产生影响,具体来说,在引入国有资本股东后,仍然为非国有股东控股的情形下,引入国有资本对企业经营绩效有更为显著的正向影响。本文的研究为引入国有资本对民营企业经营绩效的影响提供了经验证据,也为在我国现有金融体制及财政体制下,推进混合所有制改革,促进各种类型经济组织更好地利用要素资源,提供了参考。

关键词：混合所有制改革引入国有资本民营企业经营绩效资源效应

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COASTAL AND PORT ENGINEERING IN CHINA

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China Ocean Engineering 1989年第1期4卷 1-38页

作者： yan, kai Hohai Univ China

In this paper, a brief account of the characteristic features of the coast of China is given, followed by the present status and future prospects of coastal and port engineering in China, experiences gained and problems encountered. China has attached much importance to the rehabilitation and modernization of war damaged existing ports and the construction of new ports, as well as the maintenance and strengthening of coast protection works.

关键词： Coastal Zones Ports and Harbors Rivers Estuaries

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全球价值链重构下产业政策的多元化目标取向:一个理论分析框架

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经济学家 2024年第4期 78-87页

作者：徐雅卿沈开艳上海社会科学院经济研究所

本文基于全球价值链重构下多元化的产业政策目标——产业转型升级、战略自主、增强韧性、科技创新和绿色转型,分析了各目标的理论依据(主要是市场失灵和系统失灵)以及对应的产业政策工具,形成两大产业政策模式——部门导向型产业政策和... 详细信息

本文基于全球价值链重构下多元化的产业政策目标——产业转型升级、战略自主、增强韧性、科技创新和绿色转型,分析了各目标的理论依据(主要是市场失灵和系统失灵)以及对应的产业政策工具,形成两大产业政策模式——部门导向型产业政策和使命导向型产业政策。研究发现,产业转型升级、战略自主、增强韧性的产业政策目标与部门导向型产业政策相匹配;科技创新和绿色转型目标与使命导向型产业政策相匹配,两种模式相辅相成,促进产业政策在全球价值链重构中实现发展和安全并举。

关键词：全球价值链重构产业政策市场失灵系统失灵

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大黄素对脂多糖诱导的胆管上皮细胞炎症反应的影响

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中国临床药理学杂志 2024年第3期40卷 368-372页

作者：闫凯刘旭呈东南大学附属中大医院肝胆胰中心江苏南京210009 南京市第二医院胃肠治疗中心江苏南京210000

目的探讨大黄素对脂多糖(LPS)诱导的肝内胆管上皮细胞的影响及其作用机制。方法用LPS方法建立肝内胆管上皮细胞炎症模型。将细胞随机分为对照组(正常培养),模型组(20μg·mL^(-1) LPS),低、中、高剂量实验组(20μg·mL^(-1) LPS+5、10... 详细信息

目的探讨大黄素对脂多糖(LPS)诱导的肝内胆管上皮细胞的影响及其作用机制。方法用LPS方法建立肝内胆管上皮细胞炎症模型。将细胞随机分为对照组(正常培养),模型组(20μg·mL^(-1) LPS),低、中、高剂量实验组(20μg·mL^(-1) LPS+5、10、20μg·mL^(-1)大黄素)和pcDNA-TLR4组(转染pcDNA-TLR4质粒+20μg·mL^(-1) LPS+20μg·mL^(-1)大黄素)。用蛋白质印迹法检测Toll-样受体4(TLR4)、磷酸化核转录因子κB(p-NF-κB)、增殖细胞核抗原(PCNA)、上皮细胞钙黏蛋白(E-cadherin)的表达情况,用细胞计数试剂盒8(CCK-8)实验检测细胞增殖活性,用5-乙炔基-2’-脱氧尿苷(Edu)实验检测细胞增殖情况,用酶联免疫吸附试验法检测炎性因子水平。结果对照组、模型组、低剂量实验组、中剂量实验组、高剂量实验组和pcDNA-TLR4组的TLR4蛋白相对表达水平分别为0.21±0.02、0.92±0.11、0.74±0.09、0.61±0.06、0.39±0.04和1.37±0.09,p-NF-κB蛋白相对表达水平分别为0.33±0.03、1.03±0.11、0.80±0.08、0.66±0.05、0.41±0.06和0.85±0.08,E-cadherin蛋白相对表达水平分别为1.20±0.10、0.41±0.04、0.58±0.07、0.79±0.06、0.91±0.05和0.58±0.05,Edu阳性细胞率分别为(22.11±1.18)%、(51.78±2.35)%、(43.20±3.76)%、(33.19±3.58)%、(26.96±2.31)%和(41.40±2.74)%,白细胞介素-6(IL-6)水平分别为(9.79±1.35)、(38.69±3.99)、(29.80±3.41)、(25.48±1.50)、(15.63±0.91)和(27.75±3.61) pg·mL^(-1)。对照组的上述指标与模型组比较,各剂量实验组的上述指标与模型组比较,pcDNA-TLR4组的上述指标与高剂量实验组比较,在统计学上差异均有统计学意义(均P<0.05)。结论大黄素可能通过抑制TLR4/NF-κB/c-myc通路抑制细胞过度增殖和上皮间质转化进而改善LPS诱导的胆管上皮细胞炎性反应。

关键词：大黄素原发性胆汁性胆管炎脂多糖胆管上皮细胞上皮间质转化

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