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Effect of Heat Treatment on Microstructure and Mechanical Behavior of Cu-Bearing 316L Stainless Steel Produced by Selective Laser Melting

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 169-180页

作者： Huan yang Ying Liu Jianbo Jin Kunmao Li Junjie yang Lingjian meng Chunbo Li Wencai Zhang Shengfeng Zhou Sino-German College of Intelligent Manufacturing Shenzhen Technology UniversityShenzhen518118China Institute of Advanced Wear and Corrosion Resistance and Functional Materials Jinan UniversityGuangzhou510632China Department of Orthopedics First Affiliated Hospital of Jinan UniversityGuangzhou510632China

Cu-bearing stainless steels(SSs)with high strength,excellent plasticity,and effective antimicrobial properties hold significant potential for applications in the marine *** this study,Cu-bearing SSs with copper ranging from 0 to 6.0 wt%were successfully prepared using selective laser melting(SLM)*** the Cu-bearing SSs with different copper contents,the effect of heat treatment on the microstructural and mechanical behaviors was studied *** observations revealed that the subgrain size of Cu-bearing SSs increased with heat treatment at 500℃ and 700℃ for 6 ***,the tensile strength and elongation increased after the heat treatment temperature due to the combined effect of dislocations,twins,andε-Cu precipitated ***,after heat treatment at 700℃,the SLM4.5Cu sample exhibited an abnormal rise in tensile strength and *** finding suggests that the diffusion strengthening caused byε-Cu precipitates exceeded the stacking fault ***,the tensile strength and elongation reached 693.32 MPa and 56.94%,*** work provides an efficient approach for preparing Cu-bearing SSs with exceptional strength and plasticity.

关键词： Selective laser melting Cu-bearing stainless steel(SS) Heat treatment Mechanical properties

Ultra-thin robust CNT@GC film integrating effective electromagnetic shielding and flexible Joule heating

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Nano Research 2024年第5期17卷 3462-3471页

作者： Ding Zhang Chunhui Wang meng Li Weixue meng Shipeng Zhang mengdan yang Xinguang Huang Yingjiu Zhang Yuanyuan Shang Anyuan Cao Key Laboratory of Materials Physics(Ministry of Education) School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou450052China Electron Microscopy Center Yunnan UniversityKunming650091China School of Materials Science and Engineering Peking UniversityBeijing100871China

The demand for lightweight,thin electromagnetic interference(EMI)shielding film materials with high shielding effectiveness(SE),excellent mechanical properties,and stability in complex environments is particularly pronounced in the realm of flexible and portable electronic ***,we developed an ultra-thin film(CNT@GC)in which the glassy carbon(GC)layer wrapped around and welded carbon nanotubes(CNTs)to form a core-shell network structure,leading to exceptional tensile strength(327.2 MPa)and electrical conductivity(2.87×10^(5) S·m^(−1)).The CNT@GC film achieved EMI SE of 60 dB at a thickness of 2µm after post-acid treatment and high specific SE of 3.49×10^(5) dB·cm^(2)·g^(−1),with comprehensive properties surpassing those of the majority of previous shielding ***,the CNT@GC film exhibited Joule heating capability,reaching a surface temperature of 135℃at 3 V with a fast thermal response of about 0.5 s,enabling anti-icing/de-icing *** work presented a methodology for constructing a robust CNT@GC film with high EMI shielding performance and exceptional Joule heating capability,demonstrating immense potential in wearable devices,defense,and aerospace applications.

关键词： core-shell structure ultra-thin lightweight film robust film electromagnetic shielding Joule heating

Comparative studies between humans and golden Syrian hamsters via thromboelastography

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Animal Models and Experimental Medicine 2024年第4期7卷 570-577页

作者： ze yang Lili Xie Jingjing Ba Simin Zan Letong Zhang Xinyi Zhang yang Yu School of Laboratory Animal&Shandong Laboratory Animal Center Shandong First Medical University&Shandong Academy of Medical SciencesJinanChina The Second Affiliated Hospital of Shandong First Medical University TaianChina

Background:Thromboelastography(TEG)is a widely utilized clinical testing method for real-time monitoring of platelet function and the thrombosis *** metab-olism disorders are crucial risk factors for *** lipid metabolism charac-teristics of hamsters resemble those of humans more closely than mice and rats,and their relatively large blood volume makes them suitable for studying the mechanisms of thrombosis related to plasma lipid *** blood samples from golden Syrian hamsters and healthy humans were obtained following standard clinical *** was employed to evaluate coagulation factor function,fibrinogen(Fib)function,platelet function,and the fibrinolytic ***:The whole blood from hamster or healthy human was isolated following the clinical procedure,and TEG was employed to evaluate the coagulation factor func-tion,Fib function,platelet function,and fibrinolytic *** analysis used ACLTOP750 automatic coagulation analysis *** routine testing used XN-2000 automatic blood ***:TEG parameters revealed that hamsters exhibited stronger coagulation fac-tor function than humans(reaction time[R],p=0.0117),with stronger Fib function(alpha angle,p<0.0001;K-time[K],p<0.0001).Platelet function did not differ signifi-cantly(maximum amplitude[MA],p=0.077).Hamsters displayed higher coagulation status than humans(coagulation index[CI],p=0.0023),and the rate of blood clot dissolution in hamsters differed from that in humans(percentage lysis 30 min after MA,p=0.02).Coagulation analysis parameters indicated that prothrombin time(PT)and activated partial thromboplastin time(APTT)were faster in hamsters than in hu-mans(PT,p=0.0014;APTT,p=0.03),whereas the Fib content was significantly lower in hamsters than in humans(p<0.0001).No significant difference was observed in thrombin time(p=0.1949).Conclusions:In summary,TEG could be used to evaluate thrombosis and bleeding parameters in whole blood samples

关键词： platelet function Syrian hamster thromboelastography(TEG) thrombosis

Energy Storage Operation Modes in Typical Electricity Market and Their Implications for China

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Energy Engineering 2024年第9期121卷 2409-2434页

作者： Junhui Liu Yihan Zhang Zijian meng meng yang Yao Lu Zhe Chai Zhaoyuan Wu State Grid Henan Economic Research Institute Zhengzhou450052China School of Electrical and Electronic Engineering North China Electric Power UniversityBeijing102206China

As the Chinese government proposes ambitious plans to promote low-carbon transition,energy storage will play a pivotal role in China’s future power ***,due to the lack of a mature electricity market environment and corresponding mechanisms,current energy storage in China faces problems such as unclear operational models,insufficient cost recovery mechanisms,and a single investment entity,making it difficult to support the rapid development of the energy storage *** contrast,European and American countries have already embarked on certain practices in energy storage operation *** exploration of key issues such as investment entities,market participation forms,and cost recovery channels in both front and back markets,a wealth of mature experiences has been ***,this paper first summarizes the existing practices of energy storage operation models in North America,Europe,and Australia’s electricity markets separately from front and back markets,finding that perfect market mechanisms and reasonable subsidy policies are among the main drivers for promoting the rapid development of energy storage ***,combined with the actual development of China’s electricity market,it explores three key issues affecting the construction of costsharing mechanisms for energy storage under market conditions:Market participation forms,investment and operation modes,and cost recovery ***,in line with the development expectations of China’s future electricitymarket,suggestions are proposed fromfour aspects:Market environment construction,electricity price formation mechanism,cost sharing path,and policy subsidy mechanism,to promote the healthy and rapid development of China’s energy storage industry.

关键词： Electricity market energy storage operational mode cost-sharing mechanism

Effectiveness of colonoscopy,immune fecal occult blood testing,and risk-graded screening strategies in colorectal cancer screening

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World Journal of Gastrointestinal Surgery 2024年第7期16卷 2270-2280页

作者： Ming Xu Jing-Yi yang Tao meng Department of Colorectal Surgery Qilu Hospital(Qingdao)Cheeloo College of MedicineQingdao 266000Shandong ProvinceChina Department of Gastrointestinal Surgery The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052Henan ProvinceChina

BACKGROUND Colorectal cancer(CRC)is one of the most common malignant tumors,and early screening is crucial to improving the survival rate of *** combination of colonoscopy and immune fecal occult blood detection has garnered significant attention as a novel method for CRC *** and fecal occult blood tests,when combined,can improve screening accuracy and early detection rates,thereby facilitating early intervention and ***,certain risks and costs accompany it,making the establishment of a risk classification model crucial for accurate classification and management of screened *** To evaluate the feasibility and effectiveness of colonoscopy,immune fecal occult blood test(FIT),and risk-graded screening strategies in CRC *** Based on the randomized controlled trial of CRC screening in the population conducted by our hospital May 2020 to May 2023,participants who met the requirements were randomly assigned to a colonoscopy group,an FIT group,or a graded screening group at a ratio of 1:2:2(after risk assessment,the high-risk group received colonoscopy,the low-risk group received an FIT test,and the FITpositive group received colonoscopy).The three groups received CRC screening with different protocols,among which the colonoscopy group only received baseline screening,and the FIT group and the graded screening group received annual follow-up screening based on baseline *** primary outcome was the detection rate of advanced tumors,including CRC and advanced *** population participation rate,advanced tumor detection rate,and colonoscopy load of the three screening programs were *** A total of 19373 subjects who met the inclusion and exclusion criteria were enrolled,including 8082 males(41.7%)and 11291 females(58.3%).The mean age was 60.05±6.5 *** them,3883 patients were enrolled in the colonoscopy group,7793 in the FIT group,and 7697 in the graded screening *** rounds

关键词： Colorectal tumor Immune fecal occult blood testing Colonoscopy Hierarchical screening Risk assessment

Evolution of inclusions in vacuum induction melting of superalloys containing 70%return material

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Journal of Iron and Steel Research International 2024年第3期31卷 719-728页

作者： Jin-guo Gao Shu-lei yang Shu-feng yang Jing-she Li Wei Liu meng-jing Zhao An-ren Wang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Metallurgical and Building Materials Business Department China International Engineering Consulting CorporationBeijing 100048China

The variation law of inclusions type and size in the vacuum induction melting process and ingot of Ni-based superalloy containing 70%return material was studied by industrial test sampling,and the mechanism of inclusions formation was analyzed with thermodynamic *** results show that there are mainly two types of composite inclusions in the vacuum induction melting of Ni-based superalloys,which are nitride-and oxide-based composite inclusions,like Al_(2)O_(3)-SiO_(2)-Cr_(2)O_(3),TiN-(Mo,Nb)C,*** type and proportion of inclusions from the center to the edge of the vacuum induction ingot did not change *** number density of inclusions from the center to the edge of the ingot varied less,and the size of inclusions became smaller from the center to the *** addition,thermodynamic calculations show that oxides(M_(2)O_(3))are present in the liquid phase and mainly contain Al,Ti,Cr,Fe and O *** nitride consists mainly of Ti and N and contains small amounts of Cr,C,Nb,and Mo *** is consistent with the results of industrial *** the temperature decreases,the precipitation phases such as M_(2)O_(3),MN,γ,MC,δ,γ'andμphases are gradually precipitated,where oxides and nitrides are present in the liquid *** contents of O and N elements are the main influencing factors for the inclusions content and precipitation temperature;when the nitrogen content is reduced to below 0.0015%,it can make MN precipitate below the liquid-phase line.

关键词： Ni-based superalloy Vacuum induction melting Return material Inclusion Thermodynamic

Robustness of the octupole collectivity in 144Ba within the cranking covariant density functional theory in 3D lattice

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Nuclear Science and Techniques 2024年第8期35卷 124-131页

作者： ze‑Kai Li Yuan‑Yuan Wang Mathematics and Physics Department North China Electric Power UniversityBeijing 102206China Hebei Key Laboratory of Physics and Energy Technology North China Electric Power UniversityBaoding 071000China

The octupole deformation and collectivity in octupole double-magic nucleus 144Ba are investigated using the Cranking covariant density functional theory in a three-dimensional lattice *** reduced B(E3)transition probability is implemented for the first time in semiclassical approximation based on the microscopically calculated electric octupole *** available data,including the I-ωrelation and electric transitional probabilities B(E2)and B(E3)are well ***,it is shown that the ground state of 144Ba exhibits axial octupole and quadrupole deformations that persist up to high spins(I≈24h).

关键词： Octupole collectivity Cranking covariant density functional theory Rotational spectrum Electric transitional probabilities

Characterization of Polymer Aging:A Review

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Chinese Journal of Polymer Science 2024年第11期 1642-1660页

作者： Xuan Liu Rui yang Zhi-Ping Xu Yan Ye Guo-Shuo Tang Min Zhao Qian Zhang Xiang-ze meng School of Chemical and Pharmaceutical Engineering Hefei Normal University Department of Chemical Engineering Tsinghua University

Polymer aging under environmental conditions causes deterioration of service *** the aging behavior and mechanism is important not only for lifetime prediction,but also for material improvement and ***,comprehensive characterization of polymer materials during aging is *** this review,various analytical methods for characterization of chemical changes,physical changes and service properties are *** on that,methods for stabilization evaluation and lifetime prediction,especially sensitive evaluation methods are *** changes include molecular weight changes by chain scission and crosslinking,functional group changes on the surface and in the bulk,formation of free radicals,formation of small molecular species as the degradation products,and chemical distribution by heterogeneous aging and additives *** changes include crystallization changes (post-or chemi-crystallization)and morphology changes (cracking,debonding,etc.).Service property changes include deterioration of processability,mechanical properties,electrical properties and *** the end,existing problems and future research perspective are proposed,including relationship between chemical/physical changes and service properties,introduction of modern mathematical and computer tools.

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Bionic immunoactivator copresenting autophagy promoting and costimulatory molecules for synergistic cancer immunotherapy

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Nano Research 2024年第3期17卷 1710-1724页

作者： Yiwei Peng Yiliang yang Zhenzhen yang Datong Gao Jiajia Li Qi Sun Yitian Du meng Lin Xianrong Qi Beijing Key Laboratory of Molecular Pharmaceutics and New Drug Delivery System School of Pharmaceutical SciencesPeking UniversityBeijing 100191China

Immunotherapy has great promise in improving malignant tumor ***,the efficacy of existing strategies is often limited by the immunosuppressive ***,we demonstrate an in situ bionic immunoactivator,PLT-Bec1/DTA-1,with possessed natural advantages of platelets for tumor recruitment and activation,on which DTA-1(CD357 monoclonal antibody)and Bec1 were tethered as combined immune ***-Bec1/DTA-1,as a self-triggered release repository,can deliver the pre-tethered Bec1 and DTA-1 deeply through the secretion of platelet microparticles(PMPs),thereby cooperate tacitly and exhibit superiority in immune activation of dendritic cells(DCs)and T cells via autophagy inducibility,coupled with glucocorticoid-induced tumor necrosis factor receptor(GITR)-triggered T_(Reg) suppression,remodeled the immunosuppressive network of tumor ***-Bec1/DTA-1 promoted antigen presentation and T cell proliferation,and alleviated the low activity state of bone marrow-derived dendritic cells(BMDCs)in tumor suppressive ***-Bec1/DTA-1 inhibited tumor recurrence(5-and 13-fold lower of control group in tumor volume)and CD8^(+)T/T_(Reg) ratio(6.3-and 8.8-fold *** group)in mouse tumor model after intravenous or subcutaneous ***,PLT-Bec1/DTA-1 prevented tumor colonization in lung through in situ immune activation,and was slightly superior to the combined of Bec1 and *** findings highlight the promise of delivering immunostimulatory payloads via bionic carriers,eliciting automatic in situ activation of effector immune cells in tumor microenvironment for tumor *** these results provide promising prospects into the application of immunoactivator in improving cancer synergistic immunotherapy to overcome the bottlenecks in clinic.

关键词： in situ bionic immunoactivator autophagy glucocorticoid-induced tumor necrosis factor receptor(GITR)agonist platelets and platelet microparticles cancer immunotherapy