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Influence of heat treatments on incipient melting structures of DD5 nickel-based single crystal superalloy

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中国铸造:英文版 2023年第5期20卷 395-402页

作者： Zhi-hong Jia Chen-yang Li Wen-xiang Jing Xiang-feng Liang ze-kun zhang Jia-le Xiao Yu-tao Zhao School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

The evolution of microstructure and formation mechanism of incipient melting microstructure of DD5 single crystal superalloy during solution heat treatment were studied by scanning electron microscopy(SEM),electron probe microanalysis(EPMA),and energy dispersive spectroscopy(EDS).The solidus and liquidus of single crystal alloy were obtained by differential scanning calorimetry(DSC).Results show that the mosaic-like eutectic and fan-like eutectic are dissolved at first,and the coarseγ'phase is dissolved later during the solution heat treatment of 1,390°C/2 h+1,310°C/4 h+1,320°C/10 h+air cooling(AC).The composition segregations of Al,Ta,W and Re are 0.99,0.96,1.04 and 1.16,respectively,which close to *** incipient melting is caused by the low local temperature of the alloy,and the micropore region with a lower melting point is the preferred position for incipient melting.

关键词： superalloy solution heat treatment eutectic composition segregation incipient melting

Understand the Temperature Sensing Behavior of Solid-state Polymerized PEDOT Hybrid Based on X-ray Scattering Studies

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Chinese Journal of Polymer Science 2024年第1期42卷 105-112,I0010页

作者： Zhen-Hang He Guang-Feng Liu ze-kun Zhou Zhen Liu Yi-Shu zeng Peng zhang School of Materials Science and Engineering Key Laboratory for Polymeric Composite and Functional Materials of Ministry of EducationSun Yat-sen UniversityGuangzhou 510275China Shanghai Advanced Research Institute(zhangjiang Laboratory) Chinese Academy of SciencesShanghai 201204China

Poly(3,4-ethylenedioxythiophene)(PEDOT) is one of the most successful conductive polymers that recently has been used in wearable sensors for human health monitoring. In this work, we prepared a series of PEDOT hybrids consisting of PEDOT, sodium poly(styrene sulfonate)(PSSNa) and polyethylene oxide(PEO), and their preparation could be scaled-up via an adapted solid-state polymerization process. The resistance of the as-prepared PEDOT:PSS/PEO hybrid shows clear temperature response, i.e., it decreases almost linearly with the temperature increase. To understand this phenomenon, the in situ synchrotron radiation wide-and small-angle X-ray scattering(WAXS/SAXS) characterizations were undertaken to study the temperature-dependent microstructure change of the PEDOT:PSS/PEO hybrid. It demonstrated that PEDOT formed conductive paths in the hybrids, which were not destroyed by the PEO crystallization. As temperature increased, the PEO crystals' melting and the accompanying reorganization of PEDOT chains endowed the hybrid sample temperature responsiveness. Based on these fundamental knowledges, the hybrid materials were used to fabricate flexible wearable sensor that showing temperature sensing performance with an accuracy of 1 ℃. These findings shed lights on the scalable manufacturing of wearable sensors for body temperature monitoring.

关键词： Solid-state polymerization PEDOT hybrid Structure-property correlation X-ray scattering

Effect of complete revascularization in acute coronary syndrome after 75 years old:insights from the BleeMACS registry

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Journal of Geriatric Cardiology 2023年第10期20卷 728-736页

作者： Ge WANG Xiu-Huan CHEN Si-Yi LI ze-kun zhang Wei GONG Yan YAN Shao-Ping NIE JoséP.Henriques on behalf of the BleeMACS registry investigators Center for Coronary Artery Disease Beijing Anzhen HospitalCapital Medical UniversityBeijingChina Department of Cardiology Amsterdam University Medical CenterAmsterdamthe Netherlands 不详

BACKGROUND The prognostic benefit of complete revascularization in elderly patients(aged over 75 years)with multi-vessel disease and acute coronary syndrome(ACS)is currently *** study aimed to determine the long-term prognostic impact of complete revascularization in this *** We conducted this study using data obtained from the BleeMACS(Bleeding complications in a Multicenter registry of patients discharged after an Acute Coronary Syndrome)registry,which was carried out from 2003 to *** objective was to categorize older patients diagnosed with ACS into two groups:those who underwent complete revascularization and those who did *** score matching and the Kaplan-Meier analysis were employed to examine differences in one-year clinical *** primary endpoint was major adverse cardiovascular event(MACE),which encompassed a combination of all-cause mortality and myocardial *** Out of 1263 patients evaluated,445 patients(35.2%)received complete *** who underwent complete revascularization had a higher prevalence of hypertension and prior percutaneous coronary intervention compared to those who did *** the one-year follow-up period,complete revascularization was associated with a significantly decreased risk of MACE[13.7%vs.20.5%,hazard ratio(HR)=0.63,95%CI:0.45–0.88,P=0.007]and a lower risk of myocardial infarction(5.9%vs.9.9%,HR=0.55,95%CI:0.33–0.92,P=0.02).However,it was not linked to a lower risk of all-cause death(9.5%vs.13.5%,HR=0.68,95%CI:0.45–1.02,P=0.06).Similar results were observed in the subgroup *** Long-term clinical improvements were observed in ACS patients aged over 75 years with multi-vessel disease who achieved complete ***,adhering to guidelines for complete revascularization should be recommended for elderly patients.

关键词： coronary revascularization acute

Solar evaporation for simultaneous oil-water separation and electricity generation with Janus wood-based absorbers

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Frontiers of Environmental Science & Engineering 2024年第2期18卷 13-23页

作者： Yue Yang ze Fu Qi zhang Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science&TechnologyNanjing 210094China Key Laboratory of Industrial Ecology and Environmental Engineering(Ministry of Education) School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced MicrostructuresCollege of Engineering and Applied SciencesKey Laboratory of Intelligent Optical Sensing and Manipulation(Ministry of Education)Jiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210093China

Oily wastewater from ocean oil spills endangers marine ecosystems and human health. Therefore, developing an effective and sustainable solution for separating oil-water mixtures is urgent. Interfacial solar photothermal evaporation is a promising approach for the complete separation of two-phase mixtures using only solar energy. Herein, we report a carbonized wood-based absorber with Janus structure of comprising a hydrophobic top-layer and an oleophobic bottom-layer for simultaneous solar-driven oil-water separation and electricity generation. Under sunlight irradiation, the rapid evaporation of seawater will induce a separation of oil-water mixtures, and cause a high salt concentration region underlying the interface, while the bottom “bulk water” maintains in a low salt concentration, thus forming a salinity gradient. Electricity can be generated by salinity gradient power. Therefore, oil-water separation efficiency of > 99% and derived extra electricity power of ~0.1 W/m2 is achieved under solar radiation, demonstrating the feasibility of oil-water separation and electricity production synchronously directly using solar energy. This work provides a green and cost-effective path for the separation of oil-water mixtures.

关键词： Oily wastewater Carbonized wood Salinity gradient Electricity generation Solar irradiation

Mild haemoglobin drop and clinical outcomes in acute coronary syndrome patients:finding from the BleeMACS registry

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Journal of Geriatric Cardiology 2022年第12期19卷 981-989,1016页

作者： ze-kun zhang Yan YAN Si-Yi LI Sergio Raposeiras-Roubín Emad Abu-Assi JoséPHenriques Fabrizio D’Ascenzo Jorge Saucedo Wei GONG Shao-Ping NIE on behalf of the BleeMACS registry investigators Center for Coronary Artery Disease Division of CardiologyBeijing Anzhen HospitalCapital Medical UniversityBeijingChina National Clinical Research Center for Cardiovascular Diseases BeijingChina Beijing Institute of Heart Lungand Blood Vessel DiseasesBeijingChina Department of Cardiology Álvaro Cunqueiro University HospitalVigoSpain Department of Cardiology Amsterdam University Medical CenterAmsterdamthe Netherlands Division of Cardiology Department of Medical ScienceUniversity of TurinTurinItaly Division of Cardiovascular Medicine Medical College of WisconsinWisconsinUSA 不详

BACKGROUND Haemoglobin drop is common in acute coronary syndrome(ACS)patients and correlates with poor ***,the association between mild haemoglobin drop and adverse clinical outcome remains insufficiently *** study aimed to examine the association between in-hospital haemoglobin drop and risk for adverse clinical outcomes in ACS patients,especially those with mild *** Included patients from the BleeMACS(Bleeding complications in a Multicenter registry of patients discharged after an Acute Coronary Syndrome)registry were categorized into three groups by the presence and amount of in-hospital haemoglobin drop(non-drop,mild drop and severe drop).The cut-off point between mild drop and severe drop is≥3 g/*** Cox regression was used to assess the association between haemoglobin drop and major adverse cardiac endpoints(MACE).Patients taking potent P2Y_(12) inhibitors were selected for the additional *** score matching was used to avoid selective bias in the additional *** Of 6911 patients,4949 patients(71.6%)experienced in-hospital haemoglobin *** with non-drop group,patients with haemoglobin drop had higher risk of MACE[adjusted hazard ratio(HR)=1.36,95%CI:1.03–1.80 for mild drop group;adjusted HR=1.70,95%CI:1.07–2.68 for severe drop group].Patients in mild drop group were less likely to receive potent P2Y_(12) inhibitors at discharge(mild drop group *** drop group ***-drop group:10.9%vs.10.7%vs.23.8%).After propensity score matching adjustment among patients with potent P2Y_(12) inhibitors,patients in mild drop group were not associated with an increased risk of MACE than those in non-drop group(adjusted HR=1.52,95%CI:0.49–4.72).CONCLUSIONS In-hospital haemoglobin drop was common in ACS patients and associated with a higher risk for adverse *** prescription for potent P2Y_(12) inhibitors may be responsible for poor prognoses among patients with mild haemoglobin dro

关键词： patients clinical coronary

A Fair and Trusted Trading Scheme for Medical Data Based on Smart Contracts

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Computers, Materials & Continua 2024年第2期78卷 1843-1859页

作者： Xiaohui Yang kun zhang School of Cyber Security and Computer Hebei UniversityBaoding071000China

Data is regarded as a valuable asset,and sharing data is a prerequisite for fully exploiting the value of ***,the current medical data sharing scheme lacks a fair incentive mechanism,and the authenticity of data cannot be guaranteed,resulting in low enthusiasm of participants.A fair and trusted medical data trading scheme based on smart contracts is proposed,which aims to encourage participants to be honest and improve their enthusiasm for *** scheme uses zero-knowledge range proof for trusted verification,verifies the authenticity of the patient’s data and the specific attributes of the data before the transaction,and realizes privacy *** the same time,the game pricing strategy selects the best revenue strategy for all parties involved and realizes the fairness and incentive of the transaction *** smart contract is used to complete the verification and game bargaining process,and the blockchain is used as a distributed ledger to record the medical data transaction process to prevent data tampering and transaction ***,by deploying smart contracts on the Ethereum test network and conducting experiments and theoretical calculations,it is proved that the transaction scheme achieves trusted verification and fair bargaining while ensuring privacy protection in a decentralized *** experimental results show that the model improves the credibility and fairness of medical data transactions,maximizes social benefits,encourages more patients and medical institutions to participate in the circulation of medical data,and more fully taps the potential value of medical data.

关键词： Blockchain data transactions zero-knowledge proof game pricing

Learning the imaging mechanism directly from optical microscopy observations

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Photonics Research 2024年第1期12卷 7-26页

作者： ze-HAO WANG LONG-kun SHAN TONG-TIAN WENG TIAN-LONG CHEN XIANG-DONG CHEN zhang-YANG WANG GUANG-CAN GUO FANG-WEN SUN CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China University of Texas at Austin AustinTexas 78705USA Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

The optical microscopy image plays an important role in scientific research through the direct visualization of the nanoworld,where the imaging mechanism is described as the convolution of the point spread function(PSF)and *** on a priori knowledge of the PSF or equivalent PSF,it is possible to achieve more precise exploration of the ***,it is an outstanding challenge to directly extract the PSF from microscopy ***,with the help of self-supervised learning,we propose a physics-informed masked autoencoder(PiMAE)that enables a learnable estimation of the PSF and emitters directly from the raw microscopy *** demonstrate our method in synthetic data and real-world experiments with significant accuracy and noise *** outperforms DeepSTORM and the Richardson–Lucy algorithm in synthetic data tasks with an average improvement of 19.6%and 50.7%(35 tasks),respectively,as measured by the normalized root mean square error(NRMSE)*** is achieved without prior knowledge of the PSF,in contrast to the supervised approach used by DeepSTORM and the known PSF assumption in the Richardson–Lucy *** method,PiMAE,provides a feasible scheme for achieving the hidden imaging mechanism in optical microscopy and has the potential to learn hidden mechanisms in many more systems.

关键词： optical emitter mechanism

Integrated Active Suspension and Anti-Lock Braking Control for Four-Wheel-Independent-Drive Electric Vehicles

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Chinese Journal of Mechanical Engineering 2024年第1期37卷 87-98页

作者： ze Zhao Lei zhang Xiaoling Ding Zhiqiang zhang Shaohua Li Liang Gu National Engineering Research Center for Electric Vehicles Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China

This paper presents an integrated control scheme for enhancing the ride comfort and handling performance of a four-wheel-independent-drive electric vehicle through the coordination of active suspension system(ASS)and anti-lock braking system(ABS).First,a longitudinal-vertical coupled vehicle dynamics model is established by integrating a road input *** the coupling mechanisms between longitudinal and vertical vehicle dynamics are *** ASS-ABS integrated control system is proposed,utilizing an H∞controller for ASS to optimize load transfer effect and a neural network sliding mode control for ABS ***,the effectiveness of the proposed control scheme is evaluated through comprehensive tests conducted on a hardware-in-loop(HIL)test *** HIL test results demonstrate that the proposed control scheme can significantly improve the braking performance and ride comfort compared to conventional ABS control methods.

关键词： Four-wheel-independent-drive electric vehicles Active suspension system(ASS) Anti-lock braking system(ABS) Vertical-longitudinal vehicle dynamics

Interplay between the atomic structures and superconductivity of two-monolayer Pb films

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 90-98页

作者： kun Xie ze Huang Pengju Li Yumin Xia Desheng Cai Yitong Gu Yuzhou Liu Fangliang Cai Runxiao zhang Haohao Shi Ping Cui Shengyong Qin International Center for Quantum Design of Functional Materials(ICQD) University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Superconductors with reduced dimensionality have been widely explored for their exotic superconducting ***,at the two-dimensional limit,two-monolayer Pb films with two types of structures provide an ideal platform to unveil the underlying superconducting mechanism[Science 324,1314(2009)].Here,by combining scanning tunneling microscopy(STM)with the first-principle calculations,we successfully identify that these two types have different atomic lattice structures with varying stacking phases,which further enables us to calculate the phonon spectrum and electron phonon coupling strength of each *** theoretical calculations are in good agreement with tunneling spectroscopy measurements of the superconducting transition temperatures(T_(c)),which established a correlation between atomic structures and ***,it was observed that the higher T_(c)of these two types also possess higher out-of-plane upper critical magnetic fields(Hc2).These findings will provide important new insights into two-dimensional superconductivity at the atomic level.

关键词： 2 ML Pb films superconductivity atomic structure scanning tunneling microscopy first-principle calculations