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Excellent strength-ductility combination of Cr_(26)Mn_(20)Fe_(20)Co20Ni_(14) high-entropy alloy at cryogenic temperatures

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Journal of Materials Science & technology 2023年第23期154卷 166-177页

作者： Xuzhou Gao Wei Jiang Yiping Lu Zhigang Ding Jizi Liu Wei Liu Gang Sha tongming Wang tingju Li isaac t.h.chang Yonghao Zhao Nano and heterogeneous Materials Center School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Key Laboratory of Solidification Control and Digital Preparation technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China herbert Gleiter Institute of Nanoscience Nanjing University of Science and Technology Nanjing 210094 China Metallurgy and head of Liquid Metal Engineering (LiME) Doctoral training Centre Brunel Centre for Advanced Solidification Technology (BCAST) Brunel University London Uxbridge UB8 3PH UK

In the present study,a face-centered cubic non-equiatomic Cr_(26)Mn_(20)Fe_(20)Co20Ni_(14) high-entropy alloy(hEA)with a low stacking fault energy of 17.6 mJ m^(−2) was prepared by vacuum induction melting,forging and annealing *** recrystallized sample is revealed to exhibit an excellent combination of strength and ductility over a wide temperature range of 4.2–293 *** decreasing temperature from 293 to 77 K,the ductility and ultimate tensile strength(UtS)gradually increase by 30% to 95% and 137% to 1020 MPa,*** the lowest temperature of 4.2 K,the ductility keeps 65% and the UtS increases by 200% to 1300 MPa,which exceed those published in the literature,including conventional 300 series stainless *** microstructural analyses of this alloy reveal a change of deformation mechanisms from dislocation slip and nano-twinning at 293 K to nano-phase transformation at 4.2 *** cooperation and competition of multiple nano-twinning and nano-phase transformation are responsible for the superior tensile properties at cryogenic *** study provides experimental evidence for potential cryogenic applications of hEAs.

关键词： high-entropy alloys Strength and ductility Cryogenic temperature twinning Phase transformation

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Solution of the Center Problem for a Class of Polynomial Differential Systems

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Acta Mathematica Sinica,English Series 2024年第7期40卷 1685-1696页

作者： chang Jian Liu Jaume Llibre Rafael Ramírez Valentín Ramírez School of Mathematics(Zhuhai) Sun Yat-sen UniversityZhuhai519086P.R.China Departament de Matemàtiques Universitat Autònoma de Barcelona08193BellaterraBarcelonaCataloniaSpain Departament d’Enginyeria Informàtica i Matemàtiques Universitat Rovira i VirgiliAvinguda dels Paiïsos Catalans 2643007TarragonaCataloniaSpain

Consider the polynomial differential system of degree m of the form x=-y(1+μ(a_(2)x-a_(1)y))+x(v(a_(1)x+a_(2)y)+Ω_(m-1)(x,y)),y=x(1+μ(a_(2)x-a_(1)y))+y(v(a_(1)x+a_(2)y)+Ω_(m-1)(x,y)),whereμandνare real numbers such that(μ^(2)+v^(2))(μ+v(m-2))(a_(1)^(2)+a_(2)^(2))≠m>2 andΩ_(m−1)(x,y)is a homogenous polynomial of degree m−1.A conjecture,stated in *** Equations 2019,suggests that whenν=1,this differential system has a weak center at the origin if and only if after a convenient linear change of variable(x,y)→(X,Y)the system is invariant under the transformation(X,Y,t)→(−X,Y,−t).For every degree m we prove the extension of this conjecture to any value ofνexcept for a finite set of values ofμ.

关键词： Center problem polynomial differential system

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Photoelectrochemical Iron-Catalyzed C(sp^(3))-h Borylation of Alkanes in a Position-Selective Manner

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CCS Chemistry 2024年第6期6卷 1430-1438页

作者： Wen Wei Bin Wang Simon L.homölle Jinbin Zhu Yanjun Li tristan von Münchow isaac Maksso Lutz Ackermann Institut für Organische und Biomolekulare Chemie Georg-August-Universität Göttingen37077 Göttingen

Catalytic C-h borylation is of prime topical importance,since easily available feedstock chemicals can thereby be transformed into valuable transient functional groups in the absence of directing ***,we disclose an iron-catalyzed C(sp^(3))-h borylation of simple,non-prefunctionalized alkanes,providing access to value-added products in a single step by means of *** power of merging photo-and electrochemistry was mirrored by ample scope and exceedingly mild reaction ***,an outstanding position-selectivity in favor of primary C(sp^(3))-h proved viable within the photoelectrochemical borylation through a chemo-selective anodic overoxidation *** ferro-photoelectrochemistry strategy avoids toxic precious transition metals,enabling C(sp^(3))-h borylations in a site-selective fashion.

关键词： photoelectrocatalysis C(sp^(3))-h borylation iron catalysis position-selectivity chlorine radical

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Rhodium-catalyzed enantioselective in situ C(sp^(3))-h heteroarylation by a desymmetrization approach

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Chinese Chemical Letters 2024年第10期35卷 218-222页

作者： Yujia Shi Yan Qiao Pengfei Xie Miaomiao tian Xingwei Li Junbiao chang Bingxian Liu State Key Laboratory of Antiviral Drugs NMPA Key Laboratory for Research and Evaluation of Innovative DrugSchool of Chemistry and Chemical EngineeringHenan Normal UniversityPingyuan LaboratoryXinxiang 453007China Department of Pathophysiology School of Basic Medical SciencesZhengzhou UniversityZhengzhou 450001China

A rhodium-catalyzed desymmetrization reaction for enantioselective methyl C-h arylation is achieved by utilizing an in situ arylating reagent via nucleophilic cyclization of o-aminoaryl *** reaction results in chiral indoles containing all-carbon quaternary stereocenters under atmospheric conditions,with a wide range of substrates exhibiting good enantioselectivity(44 examples).Mechnism and DFt studies show that the stereocontrol is reasonably achieved through the collaborative control of a large silicon substituted chiral ligand and C-h···π,LP···πinteractions between aryl rings of the carboxylate group and the *** experiments demonstrate that Rh-aryl bond formation via in situ nucleophilic cyclization is more critical for reaction efficiency than via C-h activation of the nucleophilic cyclization byproduct.

关键词： heteroarylation C(sp^(3))-h activation Enantioselective Desymmetrization πInteractions

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Using MsfNet to Predict the ISUP Grade of Renal Clear Cell Carcinoma in Digital Pathology Images

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Computers, Materials & Continua 2024年第1期78卷 393-410页

作者： Kun Yang Shilong chang Yucheng Wang Minghui Wang Jiahui Yang Shuang Liu Kun Liu Linyan Xue College of Quality and technical Supervision Hebei UniversityBaoding071002China National and Local Joint Engineering Research Center of Metrology Instrument and System Hebei UniversityBaoding071002China hebei technology Innovation Center for Lightweight of New Energy Vehicle Power System Hebei UniversityBaoding071002China

Clear cell renal cell carcinoma(ccRCC)represents the most frequent form of renal cell carcinoma(RCC),and accurate International Society of Urological Pathology(ISUP)grading is crucial for prognosis and treatment *** study presents a new deep network called Multi-scale Fusion Network(MsfNet),which aims to enhance the automatic ISUP grade of ccRCC with digital histopathology pathology *** MsfNet overcomes the limitations of traditional ResNet50 by multi-scale information fusion and dynamic allocation of channel *** model was trained and tested using 90 hematoxylin and Eosin(h&E)stained whole slide images(WSIs),which were all cropped into 320×320-pixel patches at 40×*** achieved a micro-averaged area under the curve(AUC)of 0.9807,a macro-averaged AUC of 0.9778 on the test *** Gradient-weighted Class Activation Mapping(Grad-CAM)visually demonstrated MsfNet’s ability to distinguish and highlight abnormal areas more effectively than *** t-Distributed Stochastic Neighbor Embedding(t-SNE)plot indicates our model can efficiently extract critical features from images,reducing the impact of noise and redundant *** results suggest that MsfNet offers an accurate ISUP grade of ccRCC in digital images,emphasizing the potential of AI-assisted histopathological systems in clinical practice.

关键词： Renal cell carcinoma computer-aided diagnosis pathology image deep learning machine learning

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Patients’experiences with‘sludge’(administrative burden)in the cancer screening process and its relationship with screening completion,experience and health system distrust

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Family Medicine and Community health 2024年第S2期12卷 8-17页

作者： Michelle S Rockwell Brianna chang Vivian Zagarese Jamie K turner Ally Southworth YingXing Wu Paul Yeaton Li Li Jeffrey S Stein Sarah h Parker John W Epling Department of Family and Community Medicine Virginia Tech Carilion School of MedicineRoanokeVirginiaUSA Department of Family and Community Medicine Carilion ClinicRoanokeVirginiaUSA Virginia tech Carilion School of Medicine RoanokeVirginiaUSA Department of health Systems and Implementation Science Virginia Tech Carilion School of MedicineRoanokeVirginiaUSA Graduate Program in translational Biology Medicineand HealthVirginia TechRoanokeVirginiaUSA health Analytics Research team Carilion ClinicRoanokeVirginiaUSA Division of Gastroenterology Department of Internal MedicineCarilion ClinicRoanokeVirginiaUSA Department of Family Medicine University of Virginia School of MedicineCharlottesvilleVirginiaUSA Center for health Behaviors Research Fralin Biomedical Research Institute at VTCRoanokeVirginiaUSA

Objective‘Sludge’refers to administrative burdens or frictions that preclude people from getting what they want or need(eg,duplicative forms,complicated instructions,long waiting times).this mixed methods study evaluated patients’perceptions of sludge in the colorectal cancer(CRC)screening process and some impacts of this *** We employed an exploratory sequential mixed methods study design that comprised patient interviews and a patient *** interviews informed final survey revisions and captured contextual data about patients’experiences with *** transcripts were inductively and deductively analysed to identify overarching *** survey quantified sludge,delayed or forgone screenings,screening experience(Net Promoter Score)and health system distrust(health System Distrust Scale).We usedχ2 or t-tests for univariable comparisons and logistic or linear regressions to evaluate the association between cumulative sludge score and delayed or forgone screenings,screening experience and health system *** were integrated for *** Southeastern United *** Patients who were 45–75 years of age,at average risk for CRC and had either completed or been referred for CRC screening(colonoscopy or stool-based test)within the previous 12 *** 22 interview participants and 255 survey participants completed the study.38(15%)survey participants rated their screening experience as poor(Net Promoter Score=0–7 out of 10).the mean(SD)health System Distrust Scale score was 22.4(6.3)out of 45 possible points(higher score=greater distrust).Perceptions of sludge in the CRC screening process varied,with long waiting times and burdensome communication being the most common sources(58%and 35%of participants,respectively).Sludge was positively associated with delayed or forgone screenings(OR=1.42,95%CI 1.28,1.57,phealth system distrust(β=0.47,p

关键词： sludge screening burden

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Synergy of inside doped metals–Outside coated graphene to enhance hydrogen storage in magnesium-based alloys

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Journal of Magnesium and Alloys 2024年第6期12卷 2462-2471页

作者： Kun Zhang Yu chang Jingjing Lei Jing Chen tingzhi Si Xiaoli Ding Ping Cui hai-Wen Li Qingan Zhang Yongtao Li School of Materials Science and Engineering&Low-Carbon New Materials Research Center Anhui University of TechnologyMaanshanAnhui 243002China Institute of Nuclear and New Energy technology Tsinghua UniversityBeijing100084 hefei General Machinery Research Institute HefeiAnhui 230031China Key Laboratory of Green Fabrication and Surface technology of Advanced Metal Materials of Ministry of Education Anhui University of TechnologyMaanshan 243002China

Grain growth of magnesium(Mg)and its hydride is one of the main reasons for kinetic and capacity degradation during the hydrogen absorption and desorption *** solve this problem,herein we propose a novel method involving synergistic effect of inside embedded metals and outside coated graphene to limit the growth of Mg and its hydride *** graphene coated Mg-Y-Al alloys were selected as a model system for demonstrating this positive effect where the Mg_(91)Y_(3)Al_(6)alloy was first prepared by rapidly solidified method and then high-pressure milled with 5 wt%graphene upon 5 MPa hydrogen gas for obtaining in-situ formed YAl_(2)and Yh_(3)embedded in the Mgh_(2)matrix with graphene shell(denoted as Mgh_(2)-Y-Al@GR).In comparison to pure Mgh_(2),the obtained Mgh_(2)-Y-Al@GR composites deliver much better kinetics and more stable cyclic *** instance,the Mgh_(2)-Y-Al@GR can release about 6.1 wt%h_(2)within 30 min at 300℃ but pure Mgh_(2)only desorbs∼1.5 wt%h_(2).the activation energy for desorption of Mgh_(2)-Y-Al@GR samples is calculated to be 75.3±9.1 kJ/mol that is much lower than approximately 160 kJ/mol for pure Mgh_(2).Moreover,its capacity retention is promoted from∼57%of pure Mgh_(2)to∼84%after 50th cycles without obvious particle agglomeration and grain *** synergistic effect of outside graphene coating with inside embedded metals which could provide a huge number of active sites for catalysis as well as inhibit the grain growth of Mg and its hydride is believed to be responsible for these.

关键词： Energy hydrogen storage Mg alloys Synergy effect

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Synthesis of Long-Chain Oligomeric Donor and Acceptors via Direct Arylation for Organic Solar Cells

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Chinese Journal of Chemistry 2024年第5期42卷 523-532页

作者： Yu Wu Xin-Yu he Xu-Min huang Ling-Jun Yang Peng Liu Na Chen chang-Zhi Li Shi-Yong Liu Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry College of MaterialsMetallurgical and ChemistryJiangxi University of Science and TechnologyGanzhouJiangxi341000 China Department of Polymer Science and Engineering Zhejiang UniversityHangzhouZhejiang310027 China

the rapid synthesis of structurally complicated electron donors&acceptors still remains a major challenge in organic solar cells(OSC).In this work,we developed a highly efficient strategy to access long-chain oligomeric donor and acceptors for OSC applications.A series of cyclopentadithiophene(CPDt)and benzothiadiazole(Bt)-basedπ-conjugated oligomers,i.e.,three oligomeric acceptors(BtDt)n-IC(n=1—3)and one long-chain oligomeric donor(BtDt)4-RD,are facilely synthesized by an atom-and step-economical,and labor-saving direct C—h arylation(DACh)reaction(i.e.,C—h/C—Br cross coupling).Note that(BtDt)4-RD involving five CPDt,four Bt and two rhodamine(RD)building blocks is the longest oligomeric donor in the fullerene-free OSC devices ever *** dependence of the structure-property-performance correlation of(BtDt)n-IC(n=1—3)and(BtDt)4-RD on theπ-conjugation lengths is thoroughly investigated by opto-electrochemical measurements,bulk heterojunction(BhJ)OSC devices and ***(BtDt)1-IC:PBDB-t and(BtDt)4-RD:Y6 BhJs achieve power conversion efficiencies of 9.14%and 4.51%,*** findings demonstrate that DACh reaction is a powerful tool to tune the opto-electronic properties and device performances by regulating the lengths ofπ-conjugated oligomers with varied numbers of repeating units.

关键词： Long-chainπ-conjugated oligomer Organic solar cells Direct arylation Atom-economical synthesis Cyclopentadithiophene Benzothiadiazole C—h activation Conjugation Oligomers

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Intermediate phase-assisted growth of CsPbBr_(3) for high performance of carbon-based perovskite solar cells

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Rare Metals 2024年第5期43卷 2222-2229页

作者： Bo-Yan Liu he-Ming Yang Yu-Dong Zuo Zhi-hao tao Jun-Chun Li Ya-Jing chang Guo-Qing tong Yang Jiang School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China State Key Laboratory of Pulsed Power Laser technology National University of Defense TechnologyHefei 230037China

CsPbBr_(3)inorganic perovskites have been regarded as the promising materials in the field of photo-voltaics because of the high tolerance against *** high energy barrier of phase transition from lead bromide(PbBr_(2))to CsPbBr_(3)perovskite and low solubility of perovskite in organic solvent impede the further improvement of device performance in terms of CsPbBr_(3)solar ***,an intermediate phase-assisted growth of CsPbBr_(3)perovskite was proposed by introducing tetraphenylphosphonium bromide(tPPB)as *** tPPB is expected to react with PbBr_(2)in organic solvent to form an intermediate phase of[***]-PbBr_(2),which not only effectively improves the crystallinity of PbBr2 crystals,but also greatly reduces the phase transition energy barrier,leading to uniform and compact CsPbBr_(3)perovskite films with large grain size and high *** combination with carbon electrode,the CsPbBr_(3)solar cells yield a champion device performance of 9.57%in comparison of pristine CsPbBr_(3)solar cells showing a low efficiency of 8.17%.Furthermore,the intermediate phaseassisted growth of CsPbBr_(3)-based solar cells displays an outstanding storage over720 h.

关键词： CsPbBr_(3) Perovskite solar cells Carbon electrode hole transport layer free Intermediate phase

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Identification of P-type plasma membrane h^(+)-AtPases in common wheat and characterization of tahA7 associated with seed dormancy and germination

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Journal of Integrative Agriculture 2024年第7期23卷 2164-2177页

作者： Bingli Jiang Wei Gao Yating Jiang Shengnan Yan Jiajia Cao Litian Zhang Yue Zhang Jie Lu Chuanxi Ma Cheng chang haiping Zhang Key Laboratory of Wheat Biology and Genetic Improvement on Southern Yellow&huai River Valley Ministry of Agriculture and Rural Affairs/College of AgronomyAnhui Agricultural UniversityHefei 230036China

the P-type plasma membrane(PM)h^(+)-AtPases(hAs)are crucial for plant development,growth,and *** hAs have been thoroughly characterized in many different ***,despite their importance,the functions of hAs in germination and seed dormancy(SD)have not been validated in ***,we identified 28 tahA genes(tahA1-28)in common wheat,which were divided into five *** examination of gene expression in strong-and weak-SD wheat varieties led to the discovery of six candidate genes(tahA7/-12/-14/-16/-18/-20).Based on a single nucleotide polymorphism(SNP)mutation(C/t)in the tahA7 coding region,a CAPS marker(hA7)was developed and validated in 168 wheat varieties and 171 Chinese mini-core collections that exhibit diverse germination and SD *** further verified the roles of the two allelic variations of tahA7 in germination and SD using wheat mutants mutagenized with ethyl methane sulphonate(EMS)in‘Jimai 22’and‘Jing 411’backgrounds,and in transgenic Arabidopsis ***7 appears to regulate germination and SD by mediating gibberellic acid(GA)and abscisic acid(ABA)signaling,metabolism,and *** results presented here will enable future research regarding the tahAs in wheat.

关键词： wheat P-type plasma membrane h^(+)-AtPase seed dormancy abscisic acid gibberellin

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