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Oxide formation mechanism of a corrosion-resistant CZ1 zirconium alloy

Journal of Materials Science & Technology 2023年第16期147卷 6-15页

作者： Jing Hu Weitong Lin Qingyang Lv Changyuan Gao Jun Tan China Nuclear Power Technology Research Institute Shenzhen 518000GuangdongChina

Tailoring microstructure and microchemistry by altering elemental compositions and thermomechanical treatment parameters enables superior corrosion performance in zirconium alloys for nuclear applications.However,our understanding of the relationship between various defects and the corrosion process remains limited in the newly developed zirconium alloys.Here we report the oxide formation mechanism of a CZ1 zirconium alloy with corrosion resistance surpassing many other zirconium alloy systems,such as Zircaloy-4 and Zr-1Nb-1Sn alloys.Autoclave experiments of CZ1 alloy and Zr1Nb-1Sn model alloy were performed in 360°C water for up to 820 d.We quantitively determined oxide phases by transmission Kikuchi diffraction(TKD)and examined lateral cracks,nano-porosity,and second-phase particles in oxide scales by transmission electron microscopy(TEM).Compared to the Zr-1Nb-1Sn model alloy,CZ1 alloy with lower Nb and Sn concentrations has shown smaller and lower-density lateral cracks but slightly larger oxide grains,reducing the diffusion route for oxidating species.Using analytical scanning and transmission electron microscopy,we demonstrate that due to the lower content of Sn(∼0.9 wt.%),there is less tetragonal ZrO_(2) phase formed in the oxide,and the level of tetragonal to the monoclinic phase transition is reduced.Although the Nb content(0.1 wt.%–0.3 wt.%)is lower than the solid solution limit of Nb in Zr,by introducing minor elements such as Fe,Cr,and Cu,there are still a reasonable number of second-phase particles to relieve the high stress associated with the metal-to-oxide transformation.These mechanisms have substantially changed the density and distribution of lateral cracks in the oxide,thus reducing the corrosion rate of zirconium alloys.

关键词： Zirconium alloy Corrosion Oxide microstructure Lateral crack Tetragonal phase Nano-porosity

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The asymptotic relation between the first crossing point and the last exit time of Gaussian order statistics sequences

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Applied Mathematics(A Journal of Chinese Universities) 2023年第4期38卷 545-561页

作者： NING Zi-jun tan Zhong-quan College of Data Science Jiaxing UniversityJiaxing 314001China

In this paper,we study the asymptotic relation between the first crossing point and the last exit time for Gaussian order statistics which are generated by stationary weakly and strongly dependent Gaussian sequences.It is shown that the first crossing point and the last exit time are asymptotically independent and dependent for weakly and strongly dependent cases,respectively.The asymptotic relations between the first crossing point and the last exit time for stationary weakly and strongly dependent Gaussian sequences are also obtained.

关键词： rst crossing point last exit time stationary Gaussian sequences Gaussian order statistic se-quences

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Survey on performance of vertical slot and nature-like fishways at Angu hydropower station, Southwest China

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Water Science and Engineering 2024年第1期17卷 83-91页

作者： jun-jian Sun Jia-yue Shi Qi Zhang Xiao-tao Shi jun-Jun Tan PowerChina Huadong Engineering Corporation Limited Hangzhou 311122China Hubei International Science and Technology Cooperation Base of Fish Passage China Three Gorges UniversityYichang 443002China

To restore dam-blocked natural fish migratory passages,a growing number of artificial fishways have been built in water conservancy and hydropower projects in China.The Angu hydropower station involved diverse important fish habitats in the lower reaches of the Daduhe River in Southwest China.Therefore,a vertical slot fishway(VSF)and a nature-like fishway(NLF)were built near the backwater area of the reservoir to connect the upstream and downstream habitats.Hydrodynamic and aquatic ecological surveys were conducted after the completion of the project to estimate the fish passing effect of the two fishways.The results indicated that both fishways were in effective operation and could maintain the desired hydrodynamic conditions and be used by several local fish species.During the survey,149 fish from 15 species and 111 fish from 17 species were captured by the traps in the VSF and NLF,respectively,while 1263 fish from 27 species were found in the downstream area.Some species captured in the VSF were not found in the NLF,and vice versa,which implied the different preferences of fish.Meanwhile,3789 signals including 2099 upward ones and 1690 downward ones were monitored with an ultrasonic fish detector at the inlet of the VSF.These findings revealed the characteristics of fish species observed in and near the fishways and provided valuable insights into the different fish passing capabilities of VSFandNLF.

关键词： Vertical slot fishway Nature-like fishway Aguatic ecological survey Fishwaymonitoring Statistical analysis

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The Macrophage IL-23/IL-17A Pathway:A New Neuro-Immune Mechanism in Female Mechanical Pain

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Neuroscience Bulletin 2022年第4期38卷 453-455页

作者： Zhi tan Zhen-Jia Lin Long-jun Wu Li-jun Zhou Department of Physiology and Pain Research Center Zhongshan School of MedicineSun Yat-sen UniversityGuangzhou 510080China Department of Neurology Mayo ClinicRochesterMN 55905USA

Considerable clinical evidence has demonstrated that the prevalence and severity of many chronic pain syndromes differ across sex,and are more predominant in womenthan inmen[l]But most preclinical research on chronic pain mechanisms has been performed primarily in male animals.It is generally understood that inflammatory responses in the peripheral and central nervous systems are critical for chronic pain[2,3],Given that sex dimorphism influences immunity in various diseases[4].

关键词： immunity clinical pain

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Imidodiphosphorimidates (IDPis): Catalyst Motifs with Unprecedented Reactivity and Selectivity

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Chinese Journal of Chemistry 2023年第6期41卷 685-694页

作者： jun Kee Cheng Shao-Hua Xiang Bin tan Shenzhen Grubbs Institute and Department of Chemistry Guangdong Provincial Key Laboratory of CatalysisSouthern University of Science and TechnologyShenzhenGuangdong 518055China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhenGuangdong 518055China

The conceptually designed imidodiphosphorimidates(IDPis)have emerged as one of the most potent classes of chiral acid catalysts.They are characterized by enzyme-like,highly confined active site and high acidity,which underlie their wide-reaching applications as Bronsted acid catalysts and as precatalysts for silylium Lewis acids.Many carbon-carbon and carbon-heteroatom bond formation reactions that were deemed intractable could now be attained with spectacular reactivity and selectivity.Substrates that are small,unbiased and/or possess insufficient reactivity such as simple alkenes could now be engaged.The high structural confinement is particularly invaluable to control stereo-and chemoselectivity.The well-defined steric environment offers unique opportunity to control high-energy but structurally unbiased cation intermediates such as the norbonyl cations.Beyond practical appeals such as good scalability as well as ease and modularity of preparation,the extremely low pre-catalyst loadings required to achieve high turnover and stereoselectivity have also come to define a new frontier in organocatalysis.

关键词： Bronsted acid catalyst Lewis acid catalyst Silylium ACDC Imidodiphosphorimidates Asymmetric organocatalysis

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Carbon Dot-Modified TiO_(2)@SiO_(2) Aerogel as an Anode for Lithium-Ion Batteries

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Nanomanufacturing and Metrology 2023年第2期6卷 1-10页

作者： Zanyu Chen Jiugang Hu Kuixing Ding Jun Tan Hongshuai Hou Xiaobo Ji College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

Titanium oxides have been considered promising anode materials for lithium-ion batteries(LIBs).However,the poor conductivity and low specific capacity of bulk titanium oxides limit their application.In this study,a carbon dot-modified TiO_(2)@SiO_(2)aerogel was successfully fabricated through a facile ambient pressure drying strategy and used as an anode material of LIBs.Benefiting from the crosslinking of carbon dots and the surface modification of SiO_(2),the as-prepared hierarchical aerogel exhibited a high initial discharge capacity of 974 mAh g^(−1)and maintained a capacity of 299 mAh g^(−1)after 100 cycles at 0.1 A g^(−1).It also retained a discharge capacity of 111 mAh g^(−1)with a CE of 99.9%at 3 A g^(−1).The carbon dot-modified cross-linking skeleton contributes to the structural integrity of the TiO_(2)@SiO_(2)aerogel during repeated insertion/extraction of lithium ions,guaranteeing outstanding cycling and high-rate performance.This ambient pressure drying strategy provides a facile and feasible way to produce high-performance aerogel anode materials for lithium-ion storage.

关键词： Aerogel Ambient pressure drying Titanium oxide Lithium-ion battery

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Aldolase B attenuates clear cell renal cell carcinoma progression by inhibiting CtBP2

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Frontiers of Medicine 2023年第3期17卷 503-517页

作者： Mingyue tan Qi Pan Qi Wu Jianfa Li jun Wang Department of Urology Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China Urology Center Shuguang HospitalShanghai University of Traditional Chinese MedicineShanghai 201203China Department of Urology The Sixth Affiliated Hospital of Wenzhou Medical University(The People’s Hospital of Lishui)Lishui 323000China

Aldolase B(ALDOB),a glycolytic enzyme,is uniformly depleted in clear cell renal cell carcinoma(ccRCC)tissues.We previously showed that ALDOB inhibited proliferation through a mechanism independent of its enzymatic activity in ccRCC,but the mechanism was not unequivocally identified.We showed that the corepressor C-terminal-binding protein 2(CtBP2)is a novel ALDOB-interacting protein in ccRCC.The CtBP2-to-ALDOB expression ratio in clinical samples was correlated with the expression of CtBP2 target genes and was associated with shorter survival.ALDOB inhibited CtBP2-mediated repression of multiple cell cycle inhibitor,proapoptotic,and epithelial marker genes.Furthermore,ALDOB overexpression decreased the proliferation and migration of ccRCC cells in an ALDOB-CtBP2 interaction-dependent manner.Mechanistically,our findings showed that ALDOB recruited acireductone dioxygenase 1,which catalyzes the synthesis of an endogenous inhibitor of CtBP2,4-methylthio 2-oxobutyric acid.ALDOB functions as a scaffold to bring acireductone dioxygenase and CtBP2 in close proximity to potentiate acireductone dioxygenase-mediated inhibition of CtBP2,and this scaffolding effect was independent of ALDOB enzymatic activity.Moreover,increased ALDOB expression inhibited tumor growth in a xenograft model and decreased lung metastasis in vivo.Our findings reveal that ALDOB is a negative regulator of CtBP2 and inhibits tumor growth and metastasis in ccRCC.

关键词： ALDOB kidney cancer cell proliferation

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Current progress in understanding the molecular pathogenesis of burn scar contracture

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Burns & Trauma 2017年第2期5卷 79-84页

作者： Jianglin tan jun Wu Institute of Burn Research State Key Laboratory of Trauma Burns and Combined Injuries Chongqing Key Laboratory for Disease ProteomicsSouthwest Hospital Third Military Medical University Chongqing 400038China Department of Burns First Affiliated Hospital of Sun Yat-sen University Guangzhou 510080 China

Abnormal wound healing is likely to induce scar formation, leading to dysfunction, deformity, and psychological trauma in burn patients. Despite the advancement of medical care treatment, scar contracture in burn patients remains a challenge. Myofibroblasts play a key role in scar contracture. It has been demonstrated that myofibroblasts, as well as inflammatory cells, fibroblasts, endothelial cells, and epithelial cells, secrete transforming growth factor-β1 (TGF-β1) and other cytokines, which can promote persistent myofibroblast activation via a positive regulation loop. In addition to the cellular contribution, the microenvironments, including the mechanical tension and integrin family, are also involved in scar contracture. Most recently, eukaryotic initiation factor 6 (eIF6), an upstream regulator of TGF-β1, has been demonstrated to be involved in myofibroblast differentiation and contraction in both in vitro fibroblast-populated collagen lattice (FPCL) and in vivo external mechanical stretch models. Moreover, the data showed that P311 could induce the transdifferentiation of epidermal stem cells to myofibroblasts by upregulating TGF-β1 expression, which mediated myofibroblast contraction. In this review, we briefly described the most current progress on the biological function of myofibroblasts in scar contracture and subsequently summarized the molecular events that initiated contracture. This would help us better understand the molecular basis of scar contracture as well as to find a comprehensive strategy for preventing/managing scar contracture.

关键词： Scar Contracture Burn Molecular pathogenesis

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Multiresidue determination and potential risks of emerging pesticides in aquatic products from Northeast China by LC-MS/MS

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Journal of Environmental Sciences 2018年第1期30卷 116-125页

作者： Lei Fu Xianbo Lu Jun Tan Longxing Wang Jiping Chen CAS Key Laboratory of Separation Science for Analytical Chemistry Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Belling 100049China

A simple method for determining 33 pesticides with a wide polarity range（log Kow0.6-4.5） in aquatic products was developed based on LC–MS/MS. The target analytes included three types of widely used pesticides： insecticides, fungicides and herbicides. Based on the optimization of ultrasonic assisted extraction and GPC clean-up procedures, the matrix effect, extraction recoveries and LOD were improved distinctively. LOQ of this method was below 0.5 ng/g for all pesticides, which is superior to values in the literature, and the matrix effect was reduced effectively（-14.7% to 7.5%）. The method was successfully applied to investigate the pesticide residue levels of twenty-five samples including seven common kinds of fishes from Northeast China. The results showed that all targeted pesticides were present in the fish samples; however, their levels were low, except for atrazine, linuron,ethoprophos, tetrachlorvinphos, acetochlor and fenthion. Atrazine and linuron caught our attention because the concentrations of atrazine in fish samples from Liaoning province were in the range of 0.5-8 ng/g（w/w） with mean concentration of 2.3 ng/g, which were far above those of other pesticides. The levels of linuron were in the range of 0.6-6 ng/g（mean concentration 2.8 ng/g）, which were the highest among all targeted pesticides in the Inner Mongolia. This is the first systematic investigation on the characteristics and levels of these pesticides in aquatic products from northeast China. Considering their toxicity and bioaccumulation, the potential risk of atrazine and linuron from consuming aquatic products should be paid more attention.

关键词： Pesticide residues Aquatic products LC-MS/MS Northeast China

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3D Printing of Next-generation Electrochemical Energy Storage Devices: from Multiscale to Multimaterial

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Energy & Environmental Materials 2022年第2期5卷 427-438页

作者： Xi Xu Yong Hao tan jun Ding Cao Guan Institute of Flexible Electronics Xi’an Key Laboratory of Flexible ElectronicsNorthwestern Polytechnical UniversityXi’an 710072China Department of Materials Science and Engineering Faculty of EngineeringNational University of SingaporeSingapore 117574Singapore NUS Graduate School for Integrative Sciences and Engineering National University of SingaporeSingapore 119077Singapore

The increasing energy requirements to power the modern world has driven active research into more advanced electrochemical energy storage devices(EESD)with both high energy densities and power densities.Wide range of newly discovered materials with promising electrochemical properties has shown great potential for next-generation devices,but their performance is normally associated with contradicting demands of thin electrodes and high mass loading that can be hardly achieved for practical applications.Design of three-dimensional(3D)porous electrodes can increase the mass loading while maintaining the effective charge transport even with thick electrodes,which has proven to be efficient to overcome the limitations.3D structures have also been demonstrated excellent structural stability to withstand strong strains and stresses generated during charge/discharge cycle.3D printing,which can fabricate various delicate and complex structural designs,thus offering brand-new opportunities for the rational design and facile construction of next-generation EESDs.The recent developments in 3D printing of next-generation EESDs with high performance are reviewed.Advanced/multiscale electrode structures,such as hierarchically porous structure that can be constructed via high-resolution 3D printing or with post-treatment,are further emphasized.The ability of current 3D printing techniques to fulfill multimaterial printing to fulfill simple packaging will be covered.

关键词： 3d printing electrochemical energy storage devices multimaterial multiscale

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