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Oxidation resistant low-alloyed Ti alloys with good ductility

Rare Metals 2024年第8期43卷 3921-3936页

作者： Meng Li Zhang-Zhi Shi jun-yi xu Fu-Zhi Dai Xiang-Min Li Zi-Lin Li Lu-Ning Wang Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advance Metals and MaterialsSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

Oxidation resistance enhancement of pure Ti often comes at the cost of reduced ductility,which is frequently the problem through alloying with sole Al,Si,W,Mo and *** overcome the short coming of single element alloying,this paper proposes a multi-element low-alloying strategy to take advantage of synergistic effects and resolve the conflict between oxidation resistance and *** demonstrates that the addition of a small quantity of Ta(0.51wt%)can boost both oxidation resistance and ductility in comparison to pure ***,the combined addition of a small amount(0.54 wt%)of Ta,Nb and Si not only preserves good ductility of pure Ti,but also reduces mass gains to 14%-67%of pure Ti during 100 h oxidation at 650-850℃in *** indicates even better oxidation resistance than that obtained through the use of Ta,Nb,or Nb+Ta *** Ta+Nb+Si alloying creates an oxide layer that is less porous and more resistant to stratification and ***,a 3-μm N-rich layer can form in the Ti substrate beneath the oxide scale,in which phase transformation generates coherent Ti_(2)N with(0001)_(Ti)as the habit plane,with N atoms prefers to diffuse along■than along[0001]_(Ti).The completely transformed Ti_(2)N region or partially transformed Ti+Ti_(2)N region can effectively impede oxygen ***,the multielement low-alloying strategy is promising for enhancing both oxidation resistance and mechanical properties of metallic materials in the future.

关键词： Ti alloys Multi-element Co-alloying Oxidation resistance Mechanical properties

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Prediction of pathological complete response and prognosis in locally advanced rectal cancer

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World Journal of Gastrointestinal Oncology 2024年第6期16卷 2520-2530页

作者： yi-jun xu Dan Tao Song-Bing Qin Xiao-Yan xu Kai-Wen Yang Zhong-xu Xing Ju-ying Zhou Yang Jiao Li-Li Wang Department of Radiation Oncology The First Affiliated Hospital of Soochow UniversitySuzhou 215006Jiangsu ProvinceChina Department of Radiation Oncology The Fourth Affiliated Hospital of Soochow UniversitySuzhou 215006Jiangsu ProvinceChina School of Radiation Medicine and Protection Medical College of Soochow UniversitySuzhou 215123Jiangsu ProvinceChina

BACKGROUND Colorectal cancer is currently the third most common malignant tumor and the second leading cause of cancer-related death *** chemoradiotherapy(nCRT)is standard for locally advanced rectal cancer(LARC).Except for pathological examination after resection,it is not known exactly whether LARC patients have achieved pathological complete response(pCR)before *** date,there are no clear clinical indicators that can predict the efficacy of nCRT and patient *** To investigate the indicators that can predict pCR and long-term outcomes following nCRT in patients with *** Clinical data of 128 LARC patients admitted to our hospital between September 2013 and November 2022 were retrospectively *** were categorized into pCR and non-pCR *** analysis(using the χ^(2) test or Fisher’s exact test)and logistic multivariate regression analysis were used to study clinical predictors affecting *** 5-year disease-free survival(DFS)and overall survival(OS)rates were calculated using Kaplan-Meier analysis,and differences in survival curves were assessed with the log-rank *** Univariate analysis showed that pretreatment carcinoembryonic antigen(CEA)level,lymphocyte-monocyte ratio(LMR),time interval between neoadjuvant therapy completion and total mesorectal excision,and tumor size were correlated with *** results showed that CEA≤5 ng/mL(P=0.039),LMR>2.73(P=0.023),and time interval>10 wk(P=0.039)were independent predictors for *** analysis demonstrated that patients in the pCR group had significantly higher 5-year DFS rates(94.7%vs 59.7%,P=0.002)and 5-year OS rates(95.8%vs 80.1%,P=0.019)compared to the non-pCR *** deposits(TDs)were significantly correlated with shorter DFS(P=0.002)and OS(P<0.001).CONCLUSION Pretreatment CEA,LMR,and time interval contribute to predicting nCRT efficacy in LARC *** pCR demonstrates longer DFS and *** correlate with poor pr

关键词： Locally advanced rectal cancer Neoadjuvant chemoradiotherapy Pathological complete response Carcinoembryonic antigen Inflammation-related markers Tumor deposit Prognosis

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Forecasting of mechanical properties of covered electrode containing La/CeO_2 based on fuzzy neutral network

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Rare Metals 2018年第2期37卷 161-166页

作者： yi-jun xu Yong-Huan Guo Hui Fan School of Mechanical and Electrical Engineering Jiangsu Normal University

In order to improve the mechanical properties of deposited metal of ilmenite type welding electrode, CeO2/La rare earth elements were added into electrodes based on E4301 electrode, then electrodes were produced, test plates were welded, and mechanical properties were tested based on National Standards of China. For the sake of solving the problems of large amount of mechanical properties tests, long test cycle and high test cost during the conventional production process of electrode, a prediction model of the mechanical properties of deposited metal based on Takagi-Sugeno （T-S） fuzzy neural network was established. Mn, Si and C contents of medium manganese in electrode, CeO2, and La contents of electrode and welding speed were selected as input variables of the prediction model, and the tensile strength, lower yield strength, elongation, impact energy and hardness of de- posited metal were selected as output variables. Finally, predicting experiment was done under test samples, and results show that average relative prediction error of the tensile strength, lower yield strength, elongation and hardness are 0.91%, 2.57 %, 4.94 % and 1.94 %, respec- tively, which reach the need of actual production. The re- sults of prediction show that the mechanical properties of deposited metal of electrode containing rare earth can be forecasted accurately through material composition of electrode and welding parameters based on T-S fuzzy neural network model.

关键词： Covered electrode Rare earth element Fuzzyneural network Mechanical properties Prediction model

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Suzuki cross-coupling reactions over engineered AuPd alloy nanoparticles by recycling scattered light

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Nano Research 2022年第12期15卷 9967-9975页

作者： Ming-Yu Qi Hua-Kun Wu Masakazu Anpo Zi-Rong Tang yi-jun xu College of Chemistry State Key Laboratory of Photocatalysis on Energy and EnvironmentFuzhou UniversityFuzhou350116China Department of Applied Chemistry Osaka Prefecture UniversityOsaka599-8531Japan

Photocatalyzed organic transformations have spurred immense interest in synthetic chemistry for the efficient conversion of solar energy into chemical ***,the crucial roles of support,which fixes catalytic sites and improves the light-harvesting ability,are often ignored in photoredox ***,we report the utilization of spherical SiO2 support to engineer AuPd alloy particles(denoted as AuPd/SiO2),conceptually different from traditional methods for tuning optical absorption of plasmonic Au or AuPd particles,to manipulate light-harvesting ability of AuPd particles for highly selective and efficient photocatalytic Suzuki cross-coupling *** this deliberately designed system,typically without the size and shape alternation of AuPd particles,the supported AuPd particles recycle the scattering light from spherical SiO2 support and achieve the significant broad light-harvesting ability instead of the surface plasmon resonance *** engineered AuPd/SiO2 composites by the use of near-field scattering-promoted optical absorption showcase the remarkably enhanced activity for visible-light-induced photocatalytic Suzuki cross-coupling reactions in comparison with that using commercial SiO2 support,highlighting the spherical-support-effect induced efficient utilization of scattered *** work highlights the feasibility of manipulating the light-harvesting capability of bimetallic particles by the near-field scattering-promoted optical absorption model toward efficient photo-driven Suzuki cross-coupling reaction and other C-C coupling organic synthesis to produce high value-added chemicals.

关键词： photocatalysis AuPd alloy particles Suzuki cross-coupling light harvesting surface plasmon resonance

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Determination of La/CeO_2 content in ilmenite electrode coating

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Rare Metals 2015年第7期34卷 505-509页

作者： Yong-Huan Guo Xi-ying Fan Liang Zhang Hui Fan yi-jun xu College of Mechanical and Electrical Engineering Jiangsu Normal University xuzhou Hongyuan Automation Technology Limited Company

The ilmenite welding electrode has advantages of low cost and excellent welding technological ***, the welding quality is affected adversely by its poor crack *** solve this problem, 12 kinds of rare earths coating formulas were optimized by means of orthogonal test design and curve *** the powders containing La/Ce O2 were extruded into ilmenite welding electrode through screw-type pressing–scribbling *** that, a series of mechanical properties tests were conducted according to national ***, the mechanical properties data were analyzed comprehensively by analyzing variance, boxplot as well as Minitab 3D surface *** results show that compared with the formula without rare earth, the deposited metal’s impact toughness,the lower yield strength, the tensile strength, and the hardness are increased by 54.44 %, 9.25 %, 6.37 %, and4.27 %, *** other words, Electrode 6 with the La/Ce O2 amount of 0.5 %/0.1 % in coating has better mechanical properties.

关键词： Ilmenite-type electrode Lanthanum/cerium oxide Var

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Valorization of Biomass-Derived Platform Molecules via Photoredox Sustainable Catalysis

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Transactions of Tianjin University 2020年第5期26卷 325-340页

作者： Qiong Lin Yue-Hua Li Zi-Rong Tang yi-jun xu State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116China College of Chemistry New CampusFuzhou UniversityFuzhou 350116China

The conversion of biomass into valuable chemicals has promise for application in ***-driven photoredox catalysis,with the typical features of green route and operation under mild conditions,is considered a promising strategy for renewable biomass or biomass-derived intermediates conversion into high-value-added chemical *** this review,we strongly emphasize the recent advances in photocatalytic valorization of lignin model compounds and biomassderived *** briefl y summarize the advances in photocatalytic cleavage of theβ-O-4 bond or C–C bond into usable chemicals in the lignin *** the other hand,we clarify not only the hybrid system for cooperative biomass-relevant alcohols oxidation and hydrogen(H2)evolution but also the tunable accessibility to variation of the target products from the same alcohol reactant by catalyst design and optimization of reaction *** is hoped that this review will inspire the rational design of photoredox catalysis-based systems toward efficient biomass-derived platform molecules valorization to obtain target-oriented valuable products.

关键词： Biomass Photoredox catalysis Value-added chemicals Selective oxidation

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Interfacial engineering of CdS for efficient coupling photoredox

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Chinese Chemical Letters 2023年第7期34卷 260-264页

作者： Ming-Hui Sun Ming-Yu Qi Chang-Long Tan Zi-Rong Tang yi-jun xu College of Chemistry State Key Laboratory of Photocatalysis on Energy and EnvironmentFuzhou UniversityFuzhou 350116China

Ternary composites of reduced graphene oxide(GR)-CdS-Pd have been successfully synthesized via solvothermal and photodeposition methods for photocatalytic selective conversion of benzyl alcohol(BA)coupled with hydrogen(H_(2))production, which exhibit significantly improved photoactivity and selectivity than bare CdS. Mechanistic studies unveil that the cooperative effect of the close interface contact and matched energy level alignment between electrical conducting GR nanosheets(NSs) and CdS nanoparticles(NPs) in GR-CdS-Pd composite not only benefits the separation and transfer of photogenerated carriers but also improves the photocorrosion resistance of CdS. The photodeposited Pd NPs further promote the photogenerated charge separation and accelerate the formation of intermediate products(α-hydroxybenzyl radicals), thereby contributing to enhanced conversion of BA. This work would facilitate the rational design of GR as cocatalyst to construct an efficient and stable CdS-based composite photocatalyst for cooperative coupling of fine chemical synthesis and H_(2) evolution.

关键词： CdS Reduced graphene oxide Pd Coupling photoredox reaction Hydrogen Alcohol oxidation

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Synthesis of BiVO_4 nanosheets-graphene composites toward improved visible light photoactivity

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Journal of Energy Chemistry 2014年第5期23卷 564-574页

作者： Qianqian Yu Zi-Rong Tang yi-jun xu College of Chemistry New Campus Fuzhou University State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University

Two-dimensional （2-D） BiVO4 nanosheets-graphene （GR） composites with different weight addition ratios of GR have been prepared via a facile wet chemistry process. X-ray diffraction （XRD）, Raman spectra, X-ray photoelectron spectra （XPS）, UV-vis diffuse reflectance spectra （DRS）, field-emission scanning electron microscopy （FE-SEM）, transmission electron microscopy （TEM）, nitrogen adsorption-desorption, transient photocurrent response and photoluminescence （PL） spectra were employed to determine the properties of the samples. It is found that BiVO4 nanosheets could pave well on the surface of graphene sheets. BiVO4 nanosheets-GR composites with a proper addition amount of GR exhibited higher photocatalytic activity than bare BiVO4 nanosheets toward liquid-phase degradation of rhodamine B （RhB） and methyl orange （MO） under visible light irradiation. The enhancement of photocatalytic activities of BiVO4 nanosheets-GR composites can be attributed to the effective separation of photoexcited electron-hole pairs. This work not only provides a simple strategy for fabricating specific 2-D semiconductor-2-D GR composites, but also opens a new window of such 2-D semiconductor-2-D GR composites as visible light photocatalysts toward an improved visible light photoactivity in purifying polluted water resources.

关键词： graphene BiVO4 liquid-phase degradation rhodamine B methyl orange visible light

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Experimental analysis of matrix moveable oil saturation in tight sandstone reservoirs of the south Ordos Basin,China

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Energy Geoscience 2024年第1期5卷 184-195页

作者： Ting xu jun Pu xuejie Qin yi Wei Science and Technology Development Department Petroleum Exploration&Production Research InstituteSINOPECBeijing100083China Center Research Department of North China Petroleum Exploration&Production Research Institute SINOPECBeijing100083China Oil Field Development Department Petroleum Exploration&Production Research InstituteSINOPECBeijing100083China

Tight oil reservoirs in the south Ordos Basin are characterized by fractured,heterogeneous oil-bearing strata(an oil saturation of less than 55%on average),normal pressure(0.8±)and extra-low permeability(less than 0.3 mD).In the Chang 8 tight sandstone reservoir in Honghe oilfield,micro-and nanopores,especially those with a pore-throat radius of less than 1 mm,account for more than 90%.Fluid flow in the matrix is non-linear and crude oil flow rates are very low under normal pressure *** improved understanding of oil mobility in a tight matrix is key to further development of normalpressure tight-oil resources in the continental *** this study,constant-velocity and high-pressure mercury injection experiments were conducted using samples of typical tight sandstone cores obtained from the south of Ordos Basin.A new method for reconstructing the full-scale pore-throat distribution characteristics of tight sandstone reservoirs was established successfully,based on which multistage centrifugal tests,tests of low-pressure differential displacement of oil by water,and nuclear magnetic resonance tests were conducted in order to obtain the distribution characteristics of moveable fluid in different *** moveable oil saturation(MOS)and degree of oil recovery(*** of accumulative oil production to producing geologic reserves)of the core samples under different differential pressures for displacement were *** for the tight oil reservoirs in the south Ordos Basin,the moveable fluids are mainly stored in sub-micron(0.10-0.5 mm)*** Type I reservoirs(k>0.1 mD),the volume percentage of moveable fluid in pores with a radius larger than 0.5 mm is relatively high(greater than 40%).The degree of oil recovery of water flooding serves as the basis for forecasting recoverable reserves for tight oil *** reserves under water flooding,mainly occur in pores with a radius greater than 0.5 *** contribution of Type I reserves to oil pro

关键词： Tight reservoir Pore-throat structure Moveable fluid volume Moveable oil saturation(MOS) Waterflooding oil recovery South Ordos basin

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In Situ High-Temperature Reaction-Induced Local Structural Dynamic Evolution of Single-Atom Pt on Oxide Support

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Precision Chemistry 2023年第5期1卷 299-308页

作者： Dongxu Yan Yanxia Gao Ming-Yu Qi Hongpeng Jia yi-jun xu Xiamen Key Laboratory of Materials for Gaseous Pollutant Control Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116China

The dynamic evolution of active site coordination structure during a high-temperature reaction is critically significant but often difficult for the research of efficient single-atom catalysts(SACs).Herein,we for the first time report the in situ activation behaviors of the local coordination structure of Pt single atoms(Pt_(1))during the high-temperature oxidation of light *** distinctly enhanced activity of the catalyst is attributed to the in situ evolved Pt_(1)−oxygen vacancy(Pt_(1)−OV)combination ensemble as an efficient and stable active *** calculations reveal that the lattice oxygen adjacent to Pt_(1)and the H dissociated from CH4 constitute the lattice hydroxyl,which is the initial step in the formation of the Pt_(1)−OV ***_(1)and nearby unsaturated Mn can donate the charge back to O−O to promote the dissociation of O_(2).This work provides molecular-level insight into the in situ reaction-induced evolution of a single-atom coordination environment for designing efficient SACs under harsh conditions.

关键词： Pt single atom in situ reaction high temperature coordination structure alkane

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