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Realizing the excellent oxidation resistance of an environmental barrier coating through aluminum surface modification

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Journal of Advanced Ceramics 2024年第7期13卷 976-986页

作者： Lin Dong wen-qi yang Lin Chen Guan-Jun yang Chang-Jiu Li State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Xi’an Aerospace Engine Company Limited in China Aerospace Science and Technology Corporation Xi’an 710065China

The lifetime of Si-based environmental barrier coatings(EBCs)is constrained by thermally grown SiO_(2)oxidelayer(SiO_(2)-TGO),which can cause premature cracking and *** address this issue,a new approach for surfacemodification using aluminum is *** oxidation performance was examined in a 50 vol%H_(2)O-50 vol%O_(2)environment at 1350℃for up to 300 *** results indicate that a dense ytterbium aluminum garnet(YbAG)layer wasformed after modification,decreasing the porosity by 80%.Due to the elimination of fast diffusion channels and the lowoxygen permeability of YbAG,aluminum modification significantly reduced the growth rate of SiO_(2)-TGO by nearly twoorders of ***,its thickness decreased by more than 70%after 300 h of exposure.A diffusioncontrolled oxidation mechanism indicates that the modified dense surface is equivalent to an initial SiO_(2)layer with a specificthickness,causing a shift in the oxidation time and increasing the oxidation *** research provides valuableinsights for designing Si-based EBC with improved lifetimes.

关键词： environmental barrier coating(EBC) oxidation modification diffusion cracking

Durable dual-state duplex Si-HfO_(2)with excellent oxidation and cracking resistance

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Journal of Advanced Ceramics 2024年第3期13卷 388-401页

作者： Lin Chen Jing-Chuan Luo wen-qi yang Chang-Jiu Li Guan-Jun yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Xi’an Aerospace Engine Company Limited in CASC Xi’an 710065China

The lifetime of Si bond coatings in environmental barrier coatings is constrained by phase-transition-induced cracking of the SiO_(2)*** this study,Si-HfO_(2)dual-state duplex composite materials are proposed to address this issue by partially forming HfSiO_(4)and minimizing the SiO_(2)*** as-prepared composite exhibited a structure comprising discrete HfO_(2)“bricks”embedded in a continuous Si“mortar”,while the oxidized state transformed into discrete HfSiO_(4)“bricks”within continuous thin SiO_(2)“mortars”.The results indicate that continuous thin SiO_(2)contributes to reducing the oxidation rate to a level comparable to that of pure Si,and discrete HfSiO_(4)particles aid in relieving phase transition-induced stress and inhibiting crack propagation,thereby enhancing oxidation and cracking resistance ***,the composite with 20 mol%HfO_(2)and a mean particle size of~500 nm at 1370℃exhibited a service lifetime 10 times greater than that of pure *** research provides valuable insights for designing Si-based bond coatings with improved service lifetime.

关键词： oxidation environmental barrier coatings(EBCs) phase transition cracking bond coatings

Mesh-supported V2O5-WO3/TiO2 nanosheet array catalysts for efficient removal of NOx

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Tungsten 2025年第1期7卷 100-111页

作者： Zhi-qi Zhang Liu yang wen Luo Vladimir An Jing Li Bao-Dan Liu School of Materials Science and Engineering Northeastern University Foshan Graduate School of Innovation Northeastern University Kizhner Research Center School of Advanced Manufacturing Technologies Tomsk Polytechnic University

The design and synthesis of vanadium-based denitration catalysts with low-temperature activity pose significant challenges in the field of toxic gas *** this study,we have developed a novel approach to fabricate highly efficient V2O5-WO3/TiO2monolithic mesh catalysts for NOxreduction at low ***,TiO2nanosheets with strong adhesion and large surface area were grown on Ti mesh using plasma electrolytic oxidation technology and hydrothermal ***,super-small traces of WO3and V2O5active nano-species were subsequently deposited on TiO2nanosheets using the deposition-precipitation *** to traditional ceramic-based V2O5-WO3/TiO2catalysts,our V2O5-WO3/TiO2monolithic mesh catalyst exhibits superior mechanical performance,excellent thermal conductivity,lower pressure drop,higher utilization of active components,and stronger synergistic ***,the V2O5-WO3/TiO2monolithic mesh catalysts exhibited excellent low-temperature catalytic activity with 98% of NOxconversion at 220℃,and remarkable long-term SO2tolerance and water resistance in the selective catalytic reduction（SCR） of NOxwith *** SCR reaction of tiny V2O5and WO3active species supported on TiO2nanosheets directly demonstrated to follow the Eley-Rideal mechanism by in situ infrared spectra.

关键词： Low temperature activity Monolithic mesh catalysts NH3-SCR SO2 tolerance V2O5-WO3/TiO2

Differential distribution of PINK1 and Parkin in the primate brain implies distinct roles

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Neural Regeneration Research 2025年第4期20卷 1124-1134页

作者： Yanting Liu Wei Huang Jiayi wen Xin Xiong Ting Xu qi Wang Xiusheng Chen Xianxian Zhao Shihua Li Xiaojiang Li Weili yang Guangdong Key Laboratory of Non-human Primate Research Key Laboratory of CNS Regeneration(Ministry of Education)Guangdong-Hongkong-Macao CNS Regeneration Institute of Jinan UniversityJinan UniversityGuangzhouGuangdong ProvinceChina

The vast majority of in vitro studies have demonstrated that PINK1 phosphorylates Parkin to work together in mitophagy to protect against neuronal ***,it remains largely unclear how PINK1 and Parkin are expressed in mammalian *** has been difficult to address because of the intrinsically low levels of PINK1 and undetectable levels of phosphorylated Parkin in small *** this issue is critical for elucidating the in vivo roles of PINK1 and ***,we showed that the PINK1 kinase is selectively expressed as a truncated form(PINK1–55)in the primate *** the present study,we used multiple antibodies,including our recently developed monoclonal anti-PINK1,to validate the selective expression of PINK1 in the primate *** found that PINK1 was stably expressed in the monkey brain at postnatal and adulthood stages,which is consistent with the findings that depleting PINK1 can cause neuronal loss in developing and adult monkey ***1 was enriched in the membrane-bound fractionations,whereas Parkin was soluble with a distinguishable *** double staining experiments showed that PINK1 and Parkin did not colocalize under physiological conditions in cultured monkey astrocytes,though they did colocalize on mitochondria when the cells were exposed to mitochondrial *** findings suggest that PINK1 and Parkin may have distinct roles beyond their well-known function in mitophagy during mitochondrial damage.

关键词： neurodegeneration Parkin Parkinson’s disease PINK1 subcellular distribution

Clinical and Laboratory Characteristics of Patients with Nontuberculous Mycobacterium Bloodstream Infection in a Tertiary Referral Hospital in Beijing, China

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Chinese Medical Journal 2016年第18期129卷 2220-2225页

作者： Sai-Nan Bian Li-Fan Zhang Yue-qiu Zhang qi-wen yang Peng Wang Ying-Chun Xu Xiao-Chun Shi Xiao-qing Liu Department of Infectious Diseases Peking Union Medical College Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100730 China Clinical Epidemiology Unit International Epidemiology Network Peking Union Medical College Beijing 100730 China Laboratory Department Peking Union Medical College Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100730 China

Background： Nontuberculous Mycobacterium （NTM） bloodstream infection （BSI） is relatively rare. We aimed in this study to evaluate the clinical characteristics, laboratory evaluation, and outcomes of patients with NTM BSI. Methods： We retrospectively reviewed the clinical records of inpatients with NTM BSI at our institution between January 2008 and January 2015 and recorded clinical parameters including age, gender, underlying disease, clinical manifestation, organs involved with NTM disease, species of NTM, laboratory data, treatment and outcome of these patients. We also reviewed the reported cases and case series ofNTM BSI by searching PubMed, EMBASE, and Wanfang databases. Data of normal distribution were expressed by mean ~ standard deviation （SD）. Data of nonnormal distribution were expressed by median and interquartile range （IQR）. Results： Among the ten patients with NTM BSI, the median age was 51 years （IQR 29-57 years） and three patients were males. Eight patients were immunocompromised, with underlying diseases including human immunodeficiency virus （HIV） infection （one patient）, rheumatic diseases （two patients）, breast cancer （one patient）, myelodysplastic syndrome （two patients）, and aplastic anemia （two patients）. Other organ（s） involved were lung （two patients）, endocardium （two patients）, brain, spinal cord, and soft tissue （one each patient）. The median lymphocyte was 0.66 x 109/L （IQR 0.24-1 .93 × 10^9/L）. The median cluster of differentiation 4 （CD4） cell count was 179/ mm^3 （IQR 82-19/mm^3）. Five patients died （three with hematological diseases, one with breast cancer, and one with rheumatic disease）, three recovered, and two were lost to follow-up. Conclusions： We reported all cases in our hospital diagnosed with bloodstream NTM infection that was rarely reported. In this group of patients, patients usually had a high fever and could have multiple organ involvements. All patients with poor prognosis had underlying diseases.

关键词： Bloodstream Infection Hematogenous Disseminated Nontuberculous Mycobacterium

根系作用下的基材土–岩接触面原位剪切试验研究

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岩土工程学报 2016年第11期38卷 2107-2113页

作者：丁瑜夏振尧许文年杨奇三峡库区生态环境教育部工程研究中心湖北宜昌443002 三峡地区地质灾害与生态环境湖北省协同创新中心湖北宜昌443002 三峡大学三峡库区地质灾害教育部重点实验室湖北宜昌443002 中国电建集团贵阳勘测设计研究院有限公司贵州贵阳550081

采用自制原位剪切仪,对不同粗糙度、不同多花木蓝根系密度的基材土–岩接触面进行原位剪切试验,研究了基材土–岩接触面的剪切变形特征。研究表明,基材土–岩接触面剪切应力–位移具有典型的软化特性;受根系加筋、锚固作用影响,含根试... 详细信息

采用自制原位剪切仪,对不同粗糙度、不同多花木蓝根系密度的基材土–岩接触面进行原位剪切试验,研究了基材土–岩接触面的剪切变形特征。研究表明,基材土–岩接触面剪切应力–位移具有典型的软化特性;受根系加筋、锚固作用影响,含根试样的剪切破坏面粗糙、破碎。根系作用对土–岩接触面峰值剪切强度、峰值剪切位移及残余剪切强度影响明显,对比发现,不同粗糙度下,相同根系面积比对提高界面峰值剪切强度的贡献率差异较小;根系面积比较小时,增强界面峰值剪切强度的贡献率低于粗糙度,随着根系面积比增大,根系提高界面强度的作用更为明显,其贡献率显著增加。

关键词：生态护坡基材土–岩接触面原位剪切试验根系剪切软化

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老化SBS改性沥青再生与机理分析

长安大学学报（自然科学版） 2017年第3期37卷 1-8页

作者：李立寒张明杰祁文洋同济大学道路与交通工程教育部重点实验室上海201804 上海公路桥梁(集团)有限公司上海201804

为了探究老化SBS改性沥青的有效再生措施,设计2种方案对3种不同老化程度的SBS改性沥青进行再生,方案1为添加再生剂或基质沥青,方案2为添加再生剂+SBS类改性沥青。采用针入度、延度及反映SBS与基质沥青交联作用强弱的韧性SBC指标评价其... 详细信息

为了探究老化SBS改性沥青的有效再生措施,设计2种方案对3种不同老化程度的SBS改性沥青进行再生,方案1为添加再生剂或基质沥青,方案2为添加再生剂+SBS类改性沥青。采用针入度、延度及反映SBS与基质沥青交联作用强弱的韧性SBC指标评价其再生效果,并通过微观相态结构、红外光谱及凝胶渗透色谱分析,探究老化沥青再生的微观机理。研究结果表明:添加再生剂或基质沥青后,老化沥青中沥青质和CO基团含量减少,胶质和轻质组分含量增大,沥青的针入度和延度增大,但SBS与基质沥青间的交联作用无法恢复,韧性SBC改善效果不明显,甚至因为再生剂和基质沥青的软化作用,导致轻度老化沥青的韧性SBC降低;对于老化较严重的SBS改性沥青,在添加再生剂的基础上,添加SBS类改性沥青后,沥青质和CO基团含量进一步减少,胶质含量增大,而轻质组分含量略有减少,使得针入度降低,而延度增大,SBS与基质沥青间的交联作用也因为SBS改性剂的补充而恢复,韧性SBC大幅度提高。与SBS改性沥青相比,添加高黏度沥青后,再生沥青的针入度较小,延度和韧性SBC较大,因此,在进行轻度老化SBS改性沥青再生时,不宜添加过多的再生剂或基质沥青,否则会使沥青软化,SBS与基质沥青间的交联作用减弱,韧性降低;对于老化较严重的SBS改性沥青,宜采用添加再生剂+SBS类改性沥青的方法进行再生,使其针入度、延度和韧性尽量接近原样SBS改性沥青的水平。

关键词：道路工程再生方法微观机理 SBS改性沥青老化