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Achieving strength–ductility synergy in novel paramagnetic Fe-based medium-entropy alloys through deep cryogenic deformation

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Rare Metals 2024年第9期43卷 4493-4507页

作者： Hu-Wen ma Yan-chun Zhao Li Feng Tian-Zeng Liu Zhi-Qi Yu Bo Jin Wang-chun Duan Peter K.Liaw Dong ma State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of Technology Wenzhou Pump and Valve Engineering Research Institute Lanzhou University of Technology Iron and Steel Research Institute Jiuquan Iron and Steel Corporation Lanzhou Resources and Environment Voc-Tech University Department of materials Science and Engineering The University of Tennessee Neutron Science center Songshan Lake Materials Laboratory

cryogenic pre-deformation treatment has been widely used to effectively improve the comprehensive mechanical properties of steels and novel metals. However,the dislocation evolution and phase transformation induced by different degrees of deep cryogenic deformation are not yet fully elucidated. In this study, the effects of multiple cryogenic pre-treatments on the mechanical properties and deformation mechanisms of a paramagnetic Fe63.3Mn14-Si9.1cr9.8c3.8medium-entropy alloy（MEA） were investigated, leading to the discovery of a pretreated MEA that exhibits exceptional mechanical properties, including a fracture strength of 3.0 GPa, plastic strain of 26.1% and work-hardening index of 0.57. In addition, X-ray diffraction（XRD） and transmission electron microscopy（TEM）analyses revealed that multiple cryogenic pre-deformation treatments significantly increased the dislocation density of the MEA(from 9 × 1015to 4 × 1016m-2after three pretreatments), along with a transition in the dislocation type from predominantly edge dislocations to mixed dislocations（including screw-and edge-type dislocations）. Notably, this pretreated MEA retained its paramagnetic properties（μrcture. Thermodynamic calculations showed that cryogenic pretreatment can significantly reduce the stacking fault energy of the MEA by a factor of approximately four(i.e., from 9.7 to2.6 m J·m-2), thereby activating the synergistic effects of transformation-induced plasticity, twinning-induced plasticity and dislocation strengthening mechanisms. These synergistic effects lead to simultaneous strength and ductility enhancement of the MEA.

关键词： Deep cryogenic transformation Dislocation evolution Iron-based medium-entropy alloys Phase transformation Stacking fault energy

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Targeting carnitine palmitoyl transferase 1A(cPT1A)induces ferroptosis and synergizes with immunotherapy in lung cancer

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Signal Transduction and Targeted Therapy 2024年第4期9卷 1675-1689页

作者： Lei ma chong chen chunxing Zhao Tong Li Lingyu ma Jiayu Jiang Zhaojun Duan Qin Si Tsung-Hsien chuang Rong Xiang Yunping Luo Department of Immunology Institute of Basic Medical SciencesChinese Academy of Medical SciencesSchool of Basic MedicinePeking Union Medical CollegeBeijing 100005China collaborative Innovation center for Biotherapy Institute of Basic Medical SciencesChinese Academy of Medical SciencesSchool of Basic MedicinePeking Union Medical CollegeBeijing 100005China Department of Lung cancer Surgery Tianjin Medical University General HospitalTianjin 300052China Immunology Research center National Health Research InstitutesZhunanMiaoliTaiwanROC Department of Immunology Nankai UniversityTianjin 300071China

Despite the successful application of immune checkpoint therapy,no response or recurrence is typical in lung *** stem cells(cScs)have been identified as a crucial player in immunotherapy-related ***,a form of cell death driven by iron-dependent lipid peroxidation,is highly regulated by cellular metabolism remolding and has been shown to have synergistic effects when combined with *** adaption of cscs drives tumor resistance,yet the mechanisms of their ferroptosis defense in tumor immune evasion remain ***,through metabolomics,transcriptomics,a lung epithelialspecific cptla-knockout mouse model,and clinical analysis,we demonstrate that cPT1A,a key rate-limiting enzyme of fatty acid oxidation,acts with L-carnitine,derived from tumor-associated macrophages to drive ferroptosis-resistance and cD8^(+)T cells inactivation in lung ***,cPT1A restrains ubiquitination and degradation of c-Myc,while c-Myc transcriptionally activates cPT1A *** cPT1A/c-Myc positive feedback loop further enhances the cellular antioxidant capacity by activating the NRF2/GPX4 system and reduces the amount of phospholipid polyunsaturated fatty acids through AcSL4 downregulating,thereby suppressing ferroptosis in ***,targeting cPT1A enhances immune checkpoint blockadeinduced anti-tumor immunity and tumoral ferroptosis in tumor-bearing *** results illustrate the potential of a mechanismguided therapeutic strategy by targeting a metabolic vulnerability in the ferroptosis of cscs to improve the efficacy of lung cancer immunotherapy.

关键词： immunotherapy metabolism peroxidation

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FDSc-YOLOv8:Advancements in Automated crack Identification for Enhanced Safety in Underground Engineering

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computer Modeling in Engineering & Sciences 2024年第9期140卷 3035-3049页

作者： Rui Wang Zhihui Liu Hongdi Liu Baozhong Su chuanyi ma Key Laboratory of computing Power Network and Information Security Ministry of EducationShandong Computer Science Center(National Supercomputer Center in Jinan)Qilu University of Technology(Shandong Academy of Sciences)Jinan250353China School of Qilu Transportation Shandong UniversityJinan250100China Geotechnical and Structural Engineering center Shandong UniversityJinan250061China Shandong Lairong High-Speed Railway co. Ltd.Weihai264200China Shandong High-Speed Group co. Ltd.Jinan250014China

In underground engineering,the detection of structural cracks on tunnel surfaces stands as a pivotal task in ensuring the health and reliability of tunnel ***,the dim and dusty environment inherent to under-ground engineering poses considerable challenges to crack *** paper proposes a crack segmentation algorithm termed as Focused Detection for Subsurface cracks YOLOv8(FDSc-YOLOv8)specifically designed for underground engineering structural ***,to improve the extraction of multi-layer convolutional features,the fixed convolutional module is replaced with a deformable convolutional ***,the model’s receptive field is enhanced by introducing a multi-branch convolutional module,improving the extraction of shallow features for small ***,the Dynamic Snake convolution module is incorporated to enhance the extraction capability for slender and weak ***,the convolutional Block Attention Module(cBAM)module is employed to achieve better target *** FDSc-YOLOv8s algorithm’s maP50 and maP50-95 reach 96.5%and 66.4%,according to the testing data.

关键词： crack segmentation improved YOLOv8 engineering applications feature extraction

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Tuning mechanical and electrical performances of B_(4)c-TiB_(2)ceramics in a two-step spark plasma sintering process

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Journal of Advanced ceramics 2024年第4期13卷 518-528页

作者： Jun Zhao Xingshuo Zhang Zongning ma Dong Wang Xing Jin Songlin Ran Advanced ceramics Research center School of Materials Science and EngineeringAnhui University of TechnologyMaanshan 243002China Anhui Engineering Research center for High Efficiency Intelligent Photovoltaic Module Chaohu UniversityHefei 238024China

B_(4)c–TiB_(2)is an advanced electrically conductive ceramic with excellent mechanical and electrical discharge machinable *** is challenging and rewarding to achieve highly conductive and hard B_(4)c–TiB_(2)composites at a minimum content of conductive TiB2 that has inferior hardness but double specific gravity of the B_(4)c matrix.A novel strategy was used to construct conductive networks in B_(4)c‒15 vol%TiB2 composite ceramics with B_(4)c,Tic,and amorphous B as raw materials by a two-step spark plasma sintering *** influences of particle size matching between B_(4)c and Tic on the conducting of the strategy and the microstructure were discussed based on the selective matrix grain growth *** mechanical and electrical properties were also systematically *** B_(4)c–15 vol%TiB2 composite ceramic prepared from 10.29µm B_(4)c and 0.05µm Tic powders exhibited a perfect three-dimensional interconnected conductive network with a maximum electrical conductivity of 4.25×10^(4)S/m,together with excellent mechanical properties including flexural strength,Vickers hardness,and fracture toughness of 691±58 MPa,30.30±0.61 GPa,and 5.75±0.32 MPa·m^(1/2),respectively,while the composite obtained from 3.12µm B_(4)c and 0.8µm Tic powders had the best mechanical properties including flexural strength,Vickers hardness,and fracture toughness of 827±35 MPa,32.01±0.51 GPa,and 6.45±0.22 MPa·m^(1/2),together with a decent electrical conductivity of 0.65×10^(4)S/m.

关键词： B_(4)c-TiB_(2) mechanical properties electrical conductivity conductive network

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In situ thermoresponsive supramolecular assembly for switchable circularly polarized luminescence

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Science china chemistry 2024年第7期67卷 2362-2372页

作者： Menghan Pan Gong Zhang Haotian ma Xiaoxiao cheng Jieai Li Wei Zhang State and Local Joint Engineering Laboratory for Novel Functional Polymeric materials Jiangsu Engineering Laboratory of Novel Functional Polymeric MaterialsSuzhou Key Laboratory of Macromolecular Design and Precision SynthesisCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China School of chemical and Environmental Engineering Anhui Polytechnic UniversityWuhu 241000China

The dynamic regulation of circularly polarized luminescence(cPL)holds profound significance in various fields,such as highlevel information storage and *** we developed a chiral amphiphilic molecule,cPSB-GLU-PEG350(cGP),composed of aggregation-induced emission(AIE)chromophores(Z)-4-(1-cyano-2-phenylvinyl)benzoic acid(cPSB),a chiral linker Glutamic acid and polyethylene glycol(PEG)thermoresponsive *** the self-assembled supramolecular system formed by cGP,we have achieved in-situ temperature-responsive chiral structures,facilitating the thermal control switch of the cPL *** dynamics simulations demonstrate the distinct behaviors of AIE and PEG units during the temperature-variable assembly ***,by co-assembling achiral dye molecules with cGP,we have expanded the color range of the temperature-responsive cPL assembly system in situ and confirmed the occurrence of circularly polarizedF?rster resonance energy transfer(c-FRET)phenomenon in this process,which successfully enriched the strategies for in-situ cPL control in aqueous *** addition,the contactless radiative energy transfer of cPL can also be realized in this system,exhibiting more flexible temperature regulation of the cPL *** study provides a convenient and universal strategy for the construction of dynamically smart chiroptical materials.

关键词： circularly polarized luminescence in-situ thermoresponsive supramolecular assembly energy transfer

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Synergistic effect and heterointerface engineering of cobalt/carbon nanotubes enhancing electromagnetic wave absorbing properties of silicon carbide fibers

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Nano Research 2024年第9期17卷 8479-8486页

作者： Zixiang Zhao Zheyipei ma Zizhao Ding Yanqiong Liu Mingwei Zhang chao Jiang Institute of Powder Metallurgy Research Central South UniversityChangsha 410083China

To improve the synergistic effect between dielectric and magnetic loss is a practical and effective way in optimizing electromagnetic wave absorbing *** composites of metal particles and carbon ligands derived from metal organic frameworks have gained wide *** this study,co particles and multiwalled carbon nanotubes(cNT)were successfully synthesized covering the surface of silicon carbide(Sic)fibers,and the morphology,interfaces and electromagnetic wave absorption performance were *** sample Sic@co/cNT,the minimum reflection loss value can reach-70.22 dB at 11.21 GHz with the thickness of 2.12 *** effective absorbing bandwidth can reach up to 6.03 GHz with the thickness of 1.71 mm,which covers the entire Ku *** brings more interfaces between co particles and cNTs as well as Sic fibers and co/c *** interfacial polarization has been hugely enhanced,and the microwave absorbing properties have been *** article reports on the impedance matching of magnetic and non-magnetic components and the heterointerface engineering,which can be effective strategy and inspiration to illustrate the relationship between components,structures and functions of electromagnetic wave absorbing materials.

关键词： metal organic frameworks co nanocrystals carbon nanotubes Schottky heterointerfaces synergistic effect

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A prompt-based approach to adversarial example generation and robustness enhancement

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Frontiers of computer Science 2024年第4期18卷 85-96页

作者： Yuting YANG Pei HUANG Juan cAO Jintao LI Yun LIN Feifei ma Key Lab of Intelligent Information Processing of chinese Academy of Sciences(cAS) Institute of Computing TechnologyCASBeijing 100190China School of computer Science and Technology University of Chinese Academy of SciencesBeijing 100049China Department of computer Science Stanford UniversityCA 94305USA School of computing National University of SingaporeSingapore 119077Singapore Laboratory of Parallel Software and computational Science Institute of SoftwareChinese Academy of SciencesBeijing 100190China

Recent years have seen the wide application of natural language processing(NLP)models in crucial areas such as finance,medical treatment,and news media,raising concerns about the model robustness and *** find that prompt paradigm can probe special robust defects of pre-trained language *** prompt texts are first constructed for inputs and a pre-trained language model can generate adversarial examples for victim models via *** results show that prompt paradigm can efficiently generate more diverse adversarial examples besides synonym ***,we propose a novel robust training approach based on prompt paradigm which incorporates prompt texts as the alternatives to adversarial examples and enhances robustness under a lightweight minimax-style optimization *** on three real-world tasks and two deep neural models show that our approach can significantly improve the robustness of models to resist adversarial attacks.

关键词： robustness adversarial example prompt learning pre-trained language model

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Direct enantioselective reduction of c=c bond of β-polyfluoro-alkylated enones via asymmetric photoredox catalysis

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Science china chemistry 2024年第6期67卷 2016-2021页

作者： Linghong Zhang Jin ma Xu Ban Xiaowei Zhao Yanli Yin Zhiyong Jiang Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province Henan UniversityKaifeng475004China School of chemistry and chemical Engineering Henan Normal UniversityPingyuan LaboratoryXinxiang453007China college of Advanced Interdisciplinary Science and Technology Henan University of TechnologyZhengzhou450001China

Direct enantioselective reduction of the c=c bond ofβ-polyfluoro-alkylated enones is an important but long-pending subject in asymmetric ***,we report on the viability of visible light-driven cooperative photoredox and chiral hydrogenbonding catalysis to effectively address this challenge,as a variety of products are obtained in high yields(up to 85%)with good to excellent enantioselectivities(up to 98%ee).The formation of thermodynamically favorable enol intermediates after double single-electron reduction represents the center of the ***,the utility of the current method is validated by the convenient regio-specific and-diverse synthesis of various deuterated derivatives for these products using inexpensive D_(2)O as the deuterium source.

关键词： photoredox catalysis Br?nsted acids asymmetric reduction enantioselective protonation azaarenes

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Rational design of new in situ reduction of Ni(II)catalytic system for low-cost and large-scale preparation of porous aromatic frameworks

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carbon Energy 2024年第5期6卷 105-113页

作者： Shanshan Wang Yue Wu Wenxiang Zhang Hao Ren Guangshan Zhu Heping ma School of chemical Engineering and Technology Xi'an Jiaotong UniversityXi'anChina State Key Laboratory of Inorganic Synthesis and Preparative chemistry College of ChemistryJilin UniversityChangchunChina college of chemistry Northeast Normal UniversityChangchunChina

Porous aromatic framework 1(PAF-1)is an extremely representative nanoporous organic framework owing to its high stability and exceptionally high surface ***,the synthesis of PAF-1 is catalyzed by the Ni(cOD)2/cOD/bpy system,suffering from great instability and high ***,we developed an in situ reduction of the Ni(II)catalytic system to synthesize PAF-1 in low cost and high *** active Ni(0)species produced from the Nicl_(2)/bpy/NaI/Mg catalyst system can effectively catalyze homocoupling of tetrakis(4-bromophenyl)methane at the room temperature to form PAF-1 with high Brunauer-Emmett-Teller(BET)-specific surface area up to 4948 m^(2) g^(−1)(Langmuir surface area,6785 m2 g−1).The possible halogen exchange and dehalogenation coupling mechanisms for this new catalytic process in PAF's synthesis are discussed in *** efficiency and universality of this innovative catalyst system have also been demonstrated in other PAFs'*** work provides a cheap,facile,and efficient method for scalable synthesis of PAFs and explores their application for high-pressure storage of Xe and Kr.

关键词： adsorption carbon material nickel catalysis porous aromatic framework porous organic polymer

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Synergy enhancement of co single atoms and asymmetric subnanoclusters for Fenton-like activation

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Nano Research 2024年第9期17卷 7935-7944页

作者： Ming ma Zhiyi Sun Ziwei Deng Xiang Li Fang Zhang Wenxing chen School of materials Key Laboratory of Cluster Science Ministry of EducationBeijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsAdvanced Technologies Research Institute(Jinan)Advanced Research Institute of Multidisciplinary ScienceSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China Energy and catalysis center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Analysis and Testing center Beijing Institute of TechnologyBeijing Institute of TechnologyBeijing 100081China

As a new water treatment technology,Fenton-like reaction has great *** this study,we successfully prepared an excellent Fenton-like catalyst,which is composed of cobalt monoatoms and asymmetric subnanoclusters(labeled coSA/clu-c_(2)N),and exhibits excellent peroxymonosulfate(PMS)activation *** directly comparing the catalytic properties of coSA-c_(2)N and coSA/clu-c_(2)N,the synergistic effects of coasymmetric co subclusters and co atoms on the activation of PMS and degradation of organic micropollutants were *** results showed that coSA/clu-c_(2)N had higher degradation rates of carbamazepine(cBZ),antipyrine(AT)and chlorobenzoic acid(cA)when combined with active oxidant *** cyclic frequency of cBZ was 5.4 min^(-1),which was twice as high as the catalytic constant of coSA-c_(2)N(2.4 min^(-1)).The results show that coSA/clu-c_(2)N cobalt subnanoclusters and cobalt single atom can synergistically improve the catalytic performance of activated PMS oxidation of micropollutants in *** addition,electron paramagnetic resonance(EPR)technology has proved that the introduction of co subnano clusters in coSA/clu-c_(2)N is conducive to the production of singlet oxygen(1O_(2)),thereby improving the efficiency of pollutant *** work lays a solid foundation for the future design of advanced multifunctional catalysts by carefully regulating and combining monmetallic atoms and metal subnanoclusters.

关键词： carbamazepine Fenton-like reaction co single atoms asymmetrical sub-nanoclusters peroxymonosulfate synergy enhancement

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