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Revealing the oxidation growth mechanism and crack evolution law of novel Si-HfO 2 /Yb 2 Si 2 O 7 /Yb 2 SiO 5 environmental barrier coatings during thermal cycling

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JOURNAL OF ADVANCED CERAMICS 2024年第10期13卷 1677-1696页

作者： Liu, Ruixiang Liang, Wenping Miao, Qiang Zhao, Hui Zhang, Xiaofeng Zhang, Meng yan, rongxue Ramasubramanian, Brindha Ramakrishna, Seeram Nanjing Univ Aeronaut & Astronaut Coll Mat Sci & Technol Nanjing 210016 Peoples R China Natl Univ Singapore Dept Mech Engn Singapore City 117575 Singapore Guangdong Acad Sci Inst New Mat Natl Engn Lab Modern Mat Surface Engn Technol Guangzhou 510651 Peoples R China

The development of Si-HfO 2 /Yb 2 Si 2 O 7 /Yb 2 SiO 5 environmental barrier coatings (EBCs) aims to improve the operational temperature and longevity of ceramic matrix composites (CMCs) in turbine environments. Nevertheless, several critical questions remain unanswered, including the oxidation mechanism of Si-HfO2 bond coating, the compatibility of its mixed thermally grown oxide (m-TGO) with adjacent layers during thermal cycling, and the evolution pattern of vertical mud- cracks that impact the overall performance in service. Using plasma spraying physical vapor deposition (PS-PVD), we fabricated these EBCs on a CMC substrate, and thermal cycling tests at 1400, 1450, and 1500 degrees C revealed that their durability reached 200 h. m-TGO growth followed a parabolic model, with the oxygen diffusion activation energy being 133.69 kJ/mol between 1400 and 1450 degrees C and 101.47 kJ/mol from 1450 to 1500 degrees C, emphasizing that the transport of molecular oxygen is key to controlling the oxidation of m-TGO in this EBC system. Although residual stresses and stored elastic strain energy build up between m-TGO and adjacent layers, especially around the cristobalite phase transition temperature, causing interlaminar crack formation in later thermal cycles, the stored elastic strain energy remains lower than that of the silicon oxide-thermally grown oxide (SiO2-TGO) formed in Si bond coating system. In addition to [110] dislocations, (001) twinning and interaction zones between twinning and dislocations were discovered for the first time, driving the bifurcation of mud cracks. Notably, controlling the mud-crack density is vital for protection of Yb2SiO5 layer, as bifurcated mud-crack tips may converge with adjacent mud-cracks.

关键词： environmental barrier coatings (EBCs) thermal cycling oxidation crack propagation defects

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环氧树脂/活性炭复合材料的力学与隔声性能

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平顶山学院学报 2021年第2期36卷 33-38页

作者：施雪军闫荣学杜祥祥曹可生平顶山学院化学与环境工程学院河南平顶山467036 华中科技大学化学与化工学院湖北武汉430074

以疏松多孔的活性炭为功能填料,环氧树脂为基体,甲基六氢苯酐为固化剂,2-乙基-4-甲基咪唑为固化促进剂,制备环氧树脂/活性炭复合材料,并研究活性炭含量变化对环氧树脂/活性炭复合材料力学性能和隔声性能的影响.当样品厚度为3 mm,添加体... 详细信息

以疏松多孔的活性炭为功能填料,环氧树脂为基体,甲基六氢苯酐为固化剂,2-乙基-4-甲基咪唑为固化促进剂,制备环氧树脂/活性炭复合材料,并研究活性炭含量变化对环氧树脂/活性炭复合材料力学性能和隔声性能的影响.当样品厚度为3 mm,添加体积分数为2.4的活性炭时,复合材料的平均隔声量由纯环氧树脂的17.2 dB增加到42.6 dB.同时,力学测试结果表明少量活性炭可提高复合材料的力学性能,而高含量的活性炭不利于复合材料力学性能的提高.

关键词：环氧树脂活性炭复合材料隔声性能

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Solar cycles during the seventeenth century revealed by equatorial aurora records

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Earth and Planetary Physics 2025年第1期9卷 182-187页

作者： Yong Wei LiMei yan Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

Solar cycles are fundamental to astrophysics,space exploration,technological infrastructure,and Earth's climate.A better understanding of these cycles and their history can aid in risk mitigation on Earth,while also deepening our knowledge of stellar physics and solar system *** the solar cycles between 1600 and 1700-especially the post-1645 Maunder Minimum,characterized by significantly reduced solar activity-poses challenges to existing solar activity *** study utilizes a new red equatorial auroral catalog from ancient Korean texts to establish solar cycle patterns from 1623 to ***,a further reevaluation of the solar cycles between 1610 and 1755 identified a total of 13 cycles,diverging from the widely accepted record of 12 cycles during that *** research enhances our understanding of historical solar activity,and underscores the importance of integrating diverse historical sources into modern analyses.

关键词： solar cycle Maunder Minimum solar activity red equatorial aurora West Pacific geomagnetic anomaly

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数字化转型、新质生产力与企业创新绩效

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海南大学学报（人文社会科学版） 2025年第1期43卷 86-96页

作者：金鑫孙群力金荣学中南财经政法大学财政税务学院湖北武汉430073

在大数据与互联网时代,企业数字化转型是企业发展的必然趋势,转型过程也将对企业创新绩效产生影响。利用2015—2021年中国上市公司企业微观数据,实证分析发现:企业数字化转型将显著提升企业创新绩效水平,并通过企业科技研发投入和企业... 详细信息

在大数据与互联网时代,企业数字化转型是企业发展的必然趋势,转型过程也将对企业创新绩效产生影响。利用2015—2021年中国上市公司企业微观数据,实证分析发现:企业数字化转型将显著提升企业创新绩效水平,并通过企业科技研发投入和企业创新专利产出来体现。采用一系列稳健性检验和内生性方法分析后,模型结论依旧成立。异质性分析发现,国有企业、非重污染企业以及处在东南部区域企业数字化转型对企业创新绩效的影响效应更强。机制分析发现,企业数字化转型可通过提升企业新质生产力来提高企业的创新绩效水平。最后,从企业本身、监管机构以及政府三个角度对数字化转型和企业创新发展提出展望。

关键词：数字化转型创新绩效新质生产力

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水稻新生多肽结合复合体α链基因家族的表达分析

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华北农学报 2016年第4期31卷 1-6页

作者：王晓静孙林静马忠友孙玥李军玲张融雪闫双勇孙卫宁天津市农作物研究所天津300384 中国科学院上海生命科学研究院植物生理生态研究所上海200032

水稻新生多肽结合复合体α链(Osα-NAC)基因家族共有3个成员,分别位于第1,3,5号染色体。为研究Osα-NAC基因家族在逆境环境中的生物学功能,利用RT-q PCR和Western Blot技术,详细分析了Osα-NAC基因家族在不同组织中的表达情况,并进一步... 详细信息

水稻新生多肽结合复合体α链(Osα-NAC)基因家族共有3个成员,分别位于第1,3,5号染色体。为研究Osα-NAC基因家族在逆境环境中的生物学功能,利用RT-q PCR和Western Blot技术,详细分析了Osα-NAC基因家族在不同组织中的表达情况,并进一步研究了Osα-NAC基因家族对非生物胁迫的应答模式。结果表明,在高盐和模拟干旱条件下,Os1g NAC和Os5g NAC基因表达上调,Os3g NAC基因表达下调,提示Osα-NAC基因家族各成员在水稻响应非生物胁迫的过程中发挥不同的作用。上述试验结果初步阐明该基因家族在非生物胁迫下的表达特性,为今后更深入研究该基因家族的功能提供了理论依据。

关键词： α-NAC 基因表达蛋白表达逆境胁迫

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Silk damping in scalar-induced gravitational waves: a novel probe for new physics

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 79-85页

作者： yan-Heng Yu Sai Wang Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences School of Physics University of Chinese Academy of Sciences

Silk damping is well known in the study of cosmic microwave background（CMB） and accounts for suppression of the angular power spectrum of CMB on large angular multipoles. In this article, we study the effect of Silk damping on the scalar-induced gravitational waves（SIGWs）. Resulting from the dissipation of cosmic fluid, the Silk damping notably suppresses the energydensity spectrum of SIGWs on scales comparable to a diffusion scale at the decoupling time of weakly-interacting particles. The effect offers a novel observable for probing the underlying particle interaction, especially for those mediated by heavy gauge bosons beyond the standard model of particles. We anticipate that pulsar timing arrays are sensitive to gauge bosons with mass ～10～3-10～4 GeV, while space-and ground-based interferometers to those with mass ～10～7-1012GeV, leading to essential complements to on-going and future experiments of high-energy physics.

关键词： scalar-induced gravitational waves Silk damping new physics

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Neural Regeneration Research 2025年第2期20卷 366-377页

作者： Samuel Abokyi Dennis yan-yin Tse School of Optometry The Hong Kong Polytechnic UniversityKowloonHong Kong Special Administrative RegionChina Research Center for SHARP Vision The Hong Kong Polytechnic UniversityKowloonHong Kong Special Administrative RegionChina Center for Eye and Vision Research Sha TinHong Kong Special Administrative RegionChina

Retinal aging has been recognized as a significant risk factor for various retinal disorders,including diabetic retinopathy,age-related macular degeneration,and glaucoma,following a growing understanding of the molecular underpinnings of their *** comprehensive review explores the mechanisms of retinal aging and investigates potential neuroprotective approaches,focusing on the activation of transcription factor *** meta-analyses have demonstrated promising outcomes of transcription factor EB-targeted strategies,such as exercise,calorie restriction,rapamycin,and metformin,in patients and animal models of these common retinal *** review critically assesses the role of transcription factor EB in retinal biology during aging,its neuroprotective effects,and its therapeutic potential for retinal *** impact of transcription factor EB on retinal aging is cell-specific,influencing metabolic reprogramming and energy homeostasis in retinal neurons through the regulation of mitochondrial quality control and nutrient-sensing *** vascular endothelial cells,transcription factor EB controls important processes,including endothelial cell proliferation,endothelial tube formation,and nitric oxide levels,thereby influencing the inner blood-retinal barrier,angiogenesis,and retinal ***,transcription factor EB affects vascular smooth muscle cells,inhibiting vascular calcification and *** retinal pigment epithelial cells,transcription factor EB modulates functions such as autophagy,lysosomal dynamics,and clearance of the aging pigment lipofuscin,thereby promoting photoreceptor survival and regulating vascular endothelial growth factor A expression involved in *** cell-specific functions of transcription factor EB significantly impact retinal aging mechanisms encompassing proteostasis,neuronal synapse plasticity,energy metabolism,microvasculature,and inflammation,ultimately offering pro

关键词： age-related macular degeneration anti-aging interventions autophagy calorie restriction diabetic retinopathy exercise glaucoma neuromodulation phagocytosis photoreceptor outer segment degradation retinal aging transcription factor EB

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Autophagy-targeting modulation to promote peripheral nerve regeneration

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Neural Regeneration Research 2025年第7期20卷 1864-1882页

作者： yan Chen Hongxia Deng Nannan Zhang Department of Obstetrics and Gynecology West China Second HospitalSichuan UniversityChengduSichuan ProvinceChina Key Laboratory of Birth Defects and Women and Children’s Diseases Ministry of EducationSichuan UniversityChengduSichuan ProvinceChina Laboratory of Reproductive Endocrinology and Reproductive Regulation Sichuan UniversityChengduSichuan ProvinceChina National Center for Birth Defect Monitoring West China Second University HospitalSichuan UniversityChengduSichuan ProvinceChina

Nerve regeneration following traumatic peripheral nerve injuries and neuropathies is a complex process modulated by diverse factors and intricate molecular *** studies have focused on factors that stimulate axonal outgrowth and myelin ***,recent studies have highlighted the pivotal role of autophagy in peripheral nerve regeneration,particularly in the context of traumatic ***,autophagy-targeting modulation has emerged as a promising therapeutic approach to enhancing peripheral nerve *** current understanding suggests that activating autophagy facilitates the rapid clearance of damaged axons and myelin sheaths,thereby enhancing neuronal survival and mitigating injury-induced oxidative stress and *** actions collectively contribute to creating a favorable microenvironment for structural and functional nerve regeneration.A range of autophagyinducing drugs and interventions have demonstrated beneficial effects in alleviating peripheral neuropathy and promoting nerve regeneration in preclinical models of traumatic peripheral nerve *** review delves into the regulation of autophagy in cell types involved in peripheral nerve regeneration,summarizing the potential drugs and interventions that can be harnessed to promote this *** hope that our review will offer novel insights and perspectives on the exploitation of autophagy pathways in the treatment of peripheral nerve injuries and neuropathies.

关键词： autophagy autophagy related genes Charcot–Marie–Tooth diseases diabetic peripheral neuropathy metformin myelination peripheral nerve injury Schwann cells sciatic nerve Wallerian degeneration

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Glucocorticoid receptor signaling in the brain and its involvement in cognitive function

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Neural Regeneration Research 2025年第9期20卷 2520-2537页

作者： Chonglin Su Taiqi Huang Meiyu Zhang yanyu Zhang yan Zeng Xingxing Chen Brain Science and Advanced Technology Institute Hubei Province Key Laboratory of Occupational Hazard Identification and ControlSchool of MedicineWuhan University of Science and TechnologyWuhanHubei ProvinceChina

The hypothalamic-pituitary-adrenal axis regulates the secretion of glucoco rticoids in response to environmental *** the brain,a nuclear receptor transcription fa ctor,the glucocorticoid recepto r,is an important component of the hypothalamicpituitary-a d renal axis's negative feedback loop and plays a key role in regulating cognitive equilibrium and *** glucoco rticoid receptor influences cognitive processes,including glutamate neurotransmission,calcium signaling,and the activation of brain-derived neurotrophic factor-mediated pathways,through a combination of genomic and non-genomic *** interactions within the central nervous system can alter the expression and activity of the glucocorticoid receptor,there by affecting the hypothalamic-pituitary-a d renal axis and stress-related cognitive *** appropriate level of glucocorticoid receptor expression can improve cognitive function,while excessive glucocorticoid receptors or long-term exposure to glucoco rticoids may lead to cognitive *** with cognitive impairment-associated diseases,such as Alzheimer's disease,aging,depression,Parkinson's disease,Huntington's disease,stroke,and addiction,often present with dysregulation of the hypothalamic-pituitary-adrenal axis and glucocorticoid receptor *** review provides a comprehensive overview of the functions of the glucoco rticoid receptor in the hypothalamic-pituitary-a d renal axis and cognitive *** emphasizes that appropriate glucocorticoid receptor signaling fa cilitates learning and memory,while its dysregulation can lead to cognitive *** provides clues about how glucocorticoid receptor signaling can be targeted to ove rcome cognitive disability-related disorders.

关键词： brain-derived neurotrophic factor calcium signaling glucocorticoid receptor glucocorticoid glutamate transmission hypothalamic-pituitary-adrenal axis long-term potentiation neurocognitive disorders neuroplasticity stress

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An Artificial Intelligence-Assisted Flexible and Wearable Mechanoluminescent Strain Sensor System

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NANO-MICRO LETTERS 2025年第1期17卷 1-15页

作者： Dong, yan An, Wenzheng Wang, Zihu Zhang, Dongzhi China Univ Petr East China Coll Control Sci & Engn Qingdao 266580 Peoples R China

The sandwich-structured flexible mechanoluminescent sensor (SFLC) film shows great application potential as wireless wearable strain sensor and encryption ***-level integration of SFLC film with deep learning-based artificial intelligence enables fast and accurate interpretation of color data to strain values with automatic correction of errors caused by varying color *** smart glove wearable sensor based on the SFLC film combined with deep learning neural network enables fast and accurate hand gesture recognition. The complex wiring, bulky data collection devices, and difficulty in fast and on-site data interpretation significantly limit the practical application of flexible strain sensors as wearable devices. To tackle these challenges, this work develops an artificial intelligence-assisted, wireless, flexible, and wearable mechanoluminescent strain sensor system (AIFWMLS) by integration of deep learning neural network-based color data processing system (CDPS) with a sandwich-structured flexible mechanoluminescent sensor (SFLC) film. The SFLC film shows remarkable and robust mechanoluminescent performance with a simple structure for easy fabrication. The CDPS system can rapidly and accurately extract and interpret the color of the SFLC film to strain values with auto-correction of errors caused by the varying color temperature, which significantly improves the accuracy of the predicted strain. A smart glove mechanoluminescent sensor system demonstrates the great potential of the AIFWMLS system in human gesture recognition. Moreover, the versatile SFLC film can also serve as a encryption device. The integration of deep learning neural network-based artificial intelligence and SFLC film provides a promising strategy to break the "color to strain value" bottleneck that hinders the practical application of flexible colorimetric strain sensors, which could promote the development of wearable and flexible strain sensors from laboratory research to

关键词： Mechanoluminescent Strain sensor Flexible Deep learning Wireless

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