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Precipitating thermally reinforcement phase in aluminum alloys for enhanced strength at 400℃

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journal of Materials Science & Technology 2024年第5期172卷 71-82页

作者： Xiang Su Yuan Lei Yang chen Hongjie Qu Zhixiang qi Gong Zheng Xu Liu Henggao Xiang Guang chen National Key Laboratory of Advanced casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China School of Aviation and Mechanical Engineering Changzhou Institute of TechnologyChangzhou 213032China

Heat-resistant aluminum alloys are widely used in aerospace and automotive fields for manufacturing hot components due to their advantages in lightweight design and energy ***,the high-temperature strength of existing cast aluminum alloys is always limited to about 100 MPa at 350℃due to coarsening and transformation of strengthening ***,we reveal that the yield strength and ultimate tensile strength of the T6 state Al-8.4cu-2.3ce-1.0Mn-0.5Ni-0.2Zr alloy at 400◦c increase by 34%and 44%after re-aging at 300℃for 100 h,and its thermal strength exhibits distinguished ad-vantage over traditional heat-resistant aluminum *** enhanced elevated-temperature strength is attributed to the reprecipitation of the Ni-bearing T-Al_(20)cu_(2)Mn_(3)phase,whose number density increases over one *** significant segregation of Ni,ce,and Zr elements at the interfaces helps improve the thermal stability of the T *** thermostable T phase effectively strengthens the matrix by in-hibiting dislocation ***,a highly interconnected 3D intermetallic network along the grain boundaries can still remain after long-term re-aging at 300℃,which is conducive to imposing a drag on the grain boundaries at high *** finding offers a viable route for enhancing the elevated-temperature strength of heat-resistant aluminum alloys,which could provide expanded opportunities for higher-temperature applications.

关键词： Aluminum alloys Precipitation Thermally reinforcement phase Re-aging treatment High-temperature strength

chiral quantum heating and cooling with an optically controlled ion

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Light(Science & Applications) 2024年第7期13卷 1393-1400页

作者： jin-Tao Bu jian-qi Zhang Ge-Yi Ding jia-chong Li jia-Wei Zhang Bin Wang Wen-qiang Ding Wen-Fei Yuan Liang chen qi Zhong Ali Keçebaş Şahin KÖzdemir Fei Zhou Hui jing Mang Feng State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsInnovation Academy of Precision Measurement Science and TechnologyChinese Academy of Sciences430071 WuhanChina. University of the chinese Academy of Sciences 100049 BeijingChina. Research center for Quantum Precision Measurement Guangzhou Institute of Industry Technology511458 GuangzhouChina. Department of Engineering Science and Mechanics and Materials Research InstitutePennsylvania State UniversityUniversity ParkState CollegePA 16802USA. Key Laboratory of Low-Dimensional Quantum Structures and Quantum control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal University410081 ChangshaChina. Department of Physics Zhejiang Normal University321004 JinhuaChina

Quantum heat engines and refrigerators are open quantum systems,whose dynamics can be well understood using a non-Hermitian formalism.A prominent feature of non-Hermiticity is the existence of exceptional points(EPs),which has no counterpart in closed quantum *** has been shown in classical systems that dynamical encirclement in the vicinity of an EP,whether the loop includes the EP or not,could lead to chiral mode ***,we show that this is valid also for quantum systems when dynamical encircling is performed in the vicinity of their Liouvillian EPs(LEPs),which include the effects of quantum jumps and associated noise—an important quantum feature not present in previous *** demonstrate,using a Paul-trapped ultracold ion,the first chiral quantum heating and refrigeration by dynamically encircling a closed loop in the vicinity of an *** witness the cycling direction to be associated with the chirality and heat release(absorption)of the quantum heat engine(quantum refrigerator).Our experiments have revealed that not only the adiabaticity breakdown but also the Landau–Zener–Stückelberg process play an essential role during dynamic encircling,resulting in chiral thermodynamic *** observations contribute to further understanding of chiral and topological features in non-Hermitian systems and pave a way to exploring the relation between chirality and quantum thermodynamics.

关键词： quantum chiral dynamical

Structure and dynamical properties during solidification of liquid aluminum induced by cooling and compression

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chinese Physics B 2024年第7期33卷 476-481页

作者：吴旻杨永琪王垚 college of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China Shaoxing Research Institute Zhejiang University of TechnologyShaoxing 312000China

The structural transformation from a liquid into a crystalline solid is an important subject in condensed matter physics and materials science. In the present study, first-principles molecular dynamics calculations are performed to investigate the structure and properties of aluminum during the solidification which is induced by cooling and compression. In the cooling process and compression process, it is found that the icosahedral short-range order is initially enhanced and then begin to decay, the face-centered cubic short-range order eventually becomes dominant before it transforms into a crystalline solid.

关键词： first-principles method molecular dynamics short-range order liquid aluminum

catalytic c-H activation-initiated transdiannulation:An oxygen transfer route to ring-fluorinated tricyclic γ-lactones

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chinese chemical Letters 2024年第9期35卷 145-149页

作者： qiuyun Li Yannan Zhu Yining Wang Gang qi Wen-juan Hao Kelu Yan Bo jiang School of chemistry and chemical Engineering Yancheng Institute of TechnologyYancheng 224051China School of chemistry&Materials Science Jiangsu Normal UniversityXuzhou 221116China Key Laboratory of Life-Organic Analysis of Shandong Province School of Chemistry and Chemical EngineeringQufu Normal UniversityQufu 273165China

catalytic c–H activation-initiated annulation reactions have emerged as a versatile strategy for the efficient construction of diverse ring structural units and complex cyclic molecules in synthetic ***,we describe a new Rh(Ⅲ)-catalyzed c–H activation-initiated transdiannulation reaction of N,Ndimethyl enaminones with gem-difluorocyclopropenes in the presence of H_(2)O,enabling a facile and oxygen transfer access to ring-fluorinated tricyclicγ-lactones with a 6-5 ring-junction tetrasubstituted *** approach features bond-forming/annulation efficiency,good functional group tolerance and complete regioselectivity,which may include a complex process consisting of Rh(Ⅲ)-catalyzed c(sp2)–H activation,cyclic alkene insertion,defluorinated ring-opening of gem-difluorocyclopropane,intramolecular oxygen transfer,intramolecular cyclization and oxidative hydration.

关键词： c-H bond activation Enaminones Transannulation Oxygen transfer Regioselectivity

Production of higher excited quarkonium pair at the super Z factory

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chinese Physics c 2024年第7期48卷 45-54页

作者：廖其力蒋军 chongqing college of Mobile Telecommunications Chongqing 401520China chongqing Key Laboratory of Public Big Data Security Technology Chongqing 401520China School of Physics Shandong UniversityJinan 250100China

The heavy constituent quark pair of the heavy quarkonium is produced perturbatively and subsequently undergoes hadronization into the bound state *** production of the heavy quarkonium is essential to testing our understanding of quantum chromodynamics(QcD)in both perturbative and non-perturbative *** electron-positron collider will provide a suitable platform for the precise study of the heavy *** higher excited heavy quarkonium may contribute significantly to the ground states,which should be considered for sound *** study the production rates of the higher excited states quarkonium pair in■at the future Z factory under the non-relativistic QcD(NRQcD)framework,where the■represents the color-singlet states■The differential angle distribution of cross sections■is *** also discuss the uncertainties of cross sections caused by the varying quark masses and the renormalization scaleμ.We show that significant numbers of events for pairs of higher excited state quarkonia can be generated at the super Z factory.

关键词： Z boson decays pair of higher excited quarkonia NRQcD D0I:10.1088/1674-1137/ad3c2e

Heterointerface engineering of rhombic Rh nanosheets confined on MXene for efficient methanol oxidation

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journal of Energy chemistry 2024年第6期93卷 419-428,I0011页

作者： qi Zhang Quanguo jiang Xiang Yang chi Zhang jian Zhang Lu Yang Haiyan He Guobing Ying Huajie Huang college of Materials Science and Engineering Hohai UniversityNanjing 210098JiangsuChina New Energy Technology Engineering Lab of jiangsu Province College of ScienceNanjing University of Posts&Telecommunications(NUPT)Nanjing 210023JiangsuChina School of Materials Science and Engineering Southeast UniversityNanjing 211100JiangsuChina

Although metallic rhodium(Rh)is regarded as a promising platinum-alternative anode catalyst of direct methanol fuel cell(DMFc),the conventional"particle-to-face"contact model between Rh and matrix largely limits the overall electrocatalytic performance due to their insufficient cooperative ***,we report a controllable and robust heterointerface engineering strategy for the bottom-up fabrication of rhombic Rh nanosheets in situ confined on Ti_3c_(2)T_x MXene nanolamellas(Rh NS/MXene)via a convenient stereoassembly *** unique design concept gives the resulting 2D/2D Rh NS/MXene heterostructure intriguing textural features,including large accessible surface areas,strong"face-toface"interfacial interactions,homogeneous Rh nanosheet distribution,ameliorative electronic structure,and high electronic *** a consequence,the as-prepared Rh NS/MXene nanoarchitectures exhibit exceptional electrocatalytic methanol oxidation properties in terms of a large electrochemically active surface area of 126.2 m~2 g_(Rh)~(-1),a high mass activity of 1056.9 mA mg_(Rh)-~1,and a long service life,which significantly outperform those of conventional particle-shaped Rh catalysts supported by carbon black,carbon nanotubes,reduced graphene oxide,and MXene matrixes as well as the commercial Pt nanoparticle/carbon black and Pd nanoparticle/carbon black catalysts with the same noble metal loading *** functional theory calculations further demonstrate that the direct electronic interaction at the well-contacted 2D/2D heterointerfaces effectively enhances the adsorption energy of Rh nanosheets and induces a left shift of the d-band center,thereby making the Rh NS/MXene configuration suffer less from cO *** work highlights the importance of rational heterointerface design in the construction of advanced noble metal/MXene electrocatalysts,which may provide new avenues for developing the next-generation DMFc devices.

关键词： Rhodium nanosheet Ti_(3)c_(2)T_(x)MXene Heterointerface Electrocatalyst Fuel cell

Neuroprotective effects of chaperone-mediated autophagy in neurodegenerative diseases

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Neural Regeneration Research 2024年第6期19卷 1291-1298页

作者： qi jia jin Li Xiaofeng Guo Yi Li You Wu Yuliang Peng Zongping Fang Xijing Zhang Department of Anesthesiology and Perioperative Medicine and Department of Intensive care Unit Xijing HospitalThe Fourth Military Medical UniversityXi’anShaanxi ProvinceChina Department of critical care Medicine Air Force Medical CenterBeijingChina Translational Research Institute of Brain and Brain-Like Intelligence Shanghai Fourth People’s HospitalSchool of MedicineTongji UniversityShanghaiChina

chaperone-mediated autophagy is one of three types of autophagy and is characterized by the selective degradation of ***-mediated autophagy contributes to energy balance and helps maintain cellular homeostasis,while providing nutrients and support for cell ***-mediated autophagy activity can be detected in almost all cells,including *** to the extreme sensitivity of neurons to their environmental changes,maintaining neuronal homeostasis is critical for neuronal growth and ***-mediated autophagy dysfunction is closely related to central nervous system *** has been shown that neuronal damage and cell death are accompanied by chaperone-mediated autophagy *** certain conditions,regulation of chaperone-mediated autophagy activity attenuates *** this paper,we review the changes in chaperone-mediated autophagy in neurodegenerative diseases,brain injury,glioma,and autoimmune *** also summarize the most recent research progress on chaperone-mediated autophagy regulation and discuss the potential of chaperone-mediated autophagy as a therapeutic target for central nervous system diseases.

关键词： chaperone-mediated autophagy neurodegenerative disease neuronal homeostasis neuroprotection

Trimethylamine oxide supplementation differentially regulates fat deposition in liver, longissimus dorsi muscle and adipose tissue of growing-finishing pigs

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Animal Nutrition 2024年第2期17卷 25-35页

作者： Andong Zha Wanquan Li jing Wang Ping Bai Ming qi Peng Liao Bie Tan Yulong Yin Laboratory of Animal Nutritional Physiology and Metabolic Process Key Laboratory of Agro-ecological Processes in Subtropical RegionNational Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry ProductionInstitute of Subtropical AgricultureChinese Academy of Sciences University of chinese Academy of Sciences college of Animal Science and Technology Hunan Agricultural University Yunnan Southwest Agriculture and Animal Husbandry Group co. Ltd.

Trimethylamine oxide(TMAO) is a microbiota-derived metabolite, and numerous studies have shown that it could regulate fat metabolism in humans and mice. However, few studies have focused on the effects of TMAO on fat deposition in growing-finishing pigs. This study aimed to investigate the effect of TMAO on fat deposition and intestinal microbiota in growing-finishing pigs. Sixteen growing pigs were randomly divided into 2 groups and fed with a basal diet with 0 or 1 g/kg TMAO for 149 d. The intestinal microbial profiles, fat deposition indexes, and fatty acid profiles were measured. These results showed that TMAO supplementation had a tendency to decrease lean body mass(P cantly increased backfat thickness(P ct growth performance. TMAO significantly increased total protein(TP) concentration, and reduced alkaline phosphatase(ALP) concentration in serum(P creased the a diversity of the ileal microbiota community(P ct the colonic microbial community. TMAO supplementation significantly increased acetate content in the ileum, and Proteobacteria and Escherichia-Shigella were significantly enriched in the TMAO group(P creased fat content, as well as the ratio of linoleic acid, n-6polyunsaturated fatty acids(PUFA), and PUFA in the liver(P contrary, TMAO increased intramuscular fat content of the longissimus dorsi muscle, whereas the c18:2n6c ratio was increased,and the n-6 PUFA:PUFA ratio was decreased(P cantly upregulated the expression of FASN and SREBP1 in c2c12 cells(P creased adipocyte area and decreased the cPT-1B expression in subcutaneous fat(P crobial composition and acetate production, and regulated fat distribution and fatty acid composition in growing-finishing pigs. These results

关键词： Growing-finishing pig Trimethylamine oxide Fat deposition Fatty acid composition Intestinal microbiota

Fully-light vector tetraquark states with explicit P-wave via QcD sum rules

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chinese Physics c 2024年第3期48卷 25-38页

作者：辛琦王志刚 Department of Physics North China Electric Power UniversityBaoding 071003China School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China

In this study,we apply the QcD sum rules to investigate the vector fully-light tetraquark states with an explicit P-wave between the diquark and antidiquark *** observed that the cγα⊗↔∂μ⊗γαc(or cγα⊗↔Dμ⊗γαc)type current with fully-strange quarks couples potentially to a tetraquark state with a mass 2.16±0.14GeV,which supports assigning Y(2175)/ϕ(2170)as the diquark-antidiquark type tetraquark state with jPc=1−−.The qsˉqˉs and ssˉsˉs vector tetraquark states with the structure cγμ⊗↔∂α⊗γαc+cγα⊗↔∂α⊗γμ(or cγμ⊗↔Dα⊗γαc+cγα⊗↔Dα⊗γμ)are consistent with X(2200)and X(2400),respectively,which lie in the region from 2.20 to *** central values of the masses of the fully-strange vector tetraquark states with an explicit P-wave are approximately 2.16−3.13GeV(or 2.16−3.16GeV).Predictions for other fully-light vector tetraquark states with and without hidden-strange are also presented.

关键词： fully-light tetraquark state QcD sum rules