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A high-Nb-TiAl alloy with ultrafine-grained structure fabricated by cryomilling and spark plasma sintering

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Rare Metals 2023年第5期42卷 1678-1685页

作者： Hao Deng Yong-Qiang Wei Jun Tang Ai-Jun chen long-qing chen Zu-Xi Xia Key Laboratory of Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu610064China The Second Research Institute of Civil Aviation Administration of China(CAAC) Chengdu610064China

In this work,an ultrafine-grained high-Nb-TiAl alloy with a nominal composition of Ti-45Al-8Nb-0.2W-0.2B(at%)was prepared by cryomilling and subsequent spark plasma sintering(SPS)*** chemical composition,particle size,morphology and crystallite size of cryomilled powder were *** is found that cryomilling can effectively reduce the particle size and enhance grain *** ingots sintered at 900 and 1000℃ show an equiaxed near-γmicrostructure with grain sizes<700 nm,while the sample sintered at 1100℃exhibits duplex ***,the one sintered at 1000℃ has excellent mechanical properties,whose compression yield strength,fracture strength,bending strength and plastic strain achieve 1310,2174,578 MPa and 16.8%,*** reasons for the effect of cryomilling and the mechanical behavior of sintered ingots were *** is suggested that cryomilling in combination with SPS is an effective way to synthesize high-NbTiAl alloy with ultrafine-grained structure.

关键词： Cryomilling Spark plasma sintering Titanium aluminide Ultrafine-grained structure

Analytical and numerical modeling of optical second harmonic generation in anisotropic crystals using #SHAARP package

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npj Computational Materials 2022年第1期8卷 2343-2354页

作者： Rui Zu Bo Wang Jingyang He Jian-Jun Wang Lincoln Weber long-qing chen Venkatraman Gopalan Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA Materials Science Division Lawrence Livermore National LaboratoryLivermoreUSA Department of Engineering Science and Mechanics The Pennsylvania State UniversityUniversity ParkPA16802USA Department of Mathematics The Pennsylvania State UniversityUniversity ParkPA16802USA Department of Physics Pennsylvania State UniversityUniversity ParkPA16802USA

Electric-dipole optical second harmonic generation(SHG)is a second-order nonlinear process that is widely used as a sensitive probe to detect broken inversion symmetry and local polar *** modeling of the SHG polarimetry of a nonlinear optical material is essential to extract its point group symmetry and the absolute nonlinear *** literature on SHG analysis involves numerous approximations and a wide range of(in)*** have developed an open-source package called the Second Harmonic Analysis of Anisotropic Rotational Polarimetry(♯***)which derives analytical and numerical solutions of reflection SHG polarimetry from a single interface(.si)for bulk homogeneous crystals with arbitrary symmetry group,arbitrary crystal orientation,complex and anisotropic linear dielectric tensor with frequency dispersion,a general SHG tensor and arbitrary light polarization.♯*** enables accurate modeling of polarimetry measurements in reflection geometry from highly absorbing crystals or wedge-shaped transparent *** package is extendable to multiple interfaces.

关键词： arbitrary symmetry harmonic

Dynamical phase-field model of coupled electronic and structural processes

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npj Computational Materials 2022年第1期8卷 1223-1229页

作者： Tiannan Yang long-qing chen Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA

Many functional and quantum materials derive their functionality from the responses of both their electronic and lattice subsystems to thermal,electric,and mechanical stimuli or *** we propose a dynamical phase-field model for predicting and modeling the dynamics of simultaneous electronic and structural processes and the accompanying mesoscale pattern evolution under static or ultrafast external *** an illustrative example of application,we study the transient dynamic response of ferroelectric domain walls excited by an ultrafast above-bandgap light *** discover a two-stage relaxational electronic carrier evolution and a structural evolution containing multiple oscillational and relaxational components across picosecond to nanosecond *** phase-field model offers a general theoretical framework which can be applied to a wide range of functional and quantum materials with interactive electronic and lattice orders and phase transitions to understand,predict,and manipulate their ultrafast dynamics and rich mesoscale evolution dynamics of domains,domain walls,and charges.

关键词： electronic structural phase

Designing Proportional-Integral Consensus Protocols for Second-Order Multi-Agent Systems Using Delayed and Memorized State Information

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 878-892页

作者： Honghai Wang qing-long Han the College of Information Science and Engineering State Key Laboratory of Synthetical Automation for Process IndustriesNortheastern UniversityShenyang 110819China the School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyMelbourneVIC 3122Australia

This paper is concerned with consensus of a secondorder linear time-invariant multi-agent system in the situation that there exists a communication delay among the agents in the network.A proportional-integral consensus protocol is designed by using delayed and memorized state *** the proportional-integral consensus protocol,the consensus problem of the multi-agent system is transformed into the problem of asymptotic stability of the corresponding linear time-invariant time-delay *** that the location of the eigenvalues of the corresponding characteristic function of the linear time-invariant time-delay system not only determines the stability of the system,but also plays a critical role in the dynamic performance of the *** this paper,based on recent results on the distribution of roots of quasi-polynomials,several necessary conditions for Hurwitz stability for a class of quasi-polynomials are first *** allowable regions of consensus protocol parameters are *** necessary and sufficient conditions for determining effective protocol parameters are *** designed protocol can achieve consensus and improve the dynamic performance of the second-order multi-agent ***,the effects of delays on consensus of systems of harmonic oscillators/double integrators under proportional-integral consensus protocols are ***,some results on proportional-integral consensus are derived for a class of high-order linear time-invariant multi-agent systems.

关键词： Consensus protocol Hurwitz stability multi-agent systems quasi-polynomials time delay

The diagnostic value of tenascin-C in acute aortic syndrome

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Journal of Geriatric Cardiology 2024年第3期21卷 359-368页

作者： Ming MA Wei chen Hai-long CAO Jun PAN qing ZHOU Xin-long TANG Dong-Jin WANG Department of Thoracic and Cardiovascular Surgery Nanjing Drum Tower Hospital Clinical College of Nanjing Medical UniversityNanjingChina Department of Thoracic and Cardiovascular Surgery Nanjing Drum Tower HospitalAffiliated Hospital of Medical SchoolNanjing UniversityNanjingChina Department of Thoracic surgery Kunshan Hospital of Traditional Chinese MedicineJiangsuChina

OBJECTIVES Misdiagnosis of acute aortic syndrome(AAS)significantly increases ***-C(TN-C)is an extracellular matrix glycoprotein related to cardiovascular *** elevation of TN-C in AAS and whether it can discriminate suddenonset of acute chest pain in Chinese remains *** We measured the plasma concentration of TN-C by ELISA in a cohort of 376 patients with chest or back *** to discriminate AAS from acute coronary syndrome(ACS)were compared and *** From October 2016 to September 2021,376 undiagnosed patients with chest or back pain were enrolled.166 of them were finally diagnosed as AAS,100 were ACS and 110 without cardiovascular diseases(NCV).TN-C was significantly elevated in AAS at 18.18 ng/mL(IQR:13.10–27.68)compared with 7.51 ng/mL(IQR:5.67–11.38)in ACS(P<0.001)and 3.68 ng/mL(IQR:2.50–5.29)in NCV(P<0.001).There was no significant difference in TN-C level among the subtypes of *** the 166 AAS patients,the peaked level of TN-C was at acute stage(P=0.012),then a slight of decrease was observed at subacute *** area under receiver operating characteristic curve for AAS patients versus NCV was 0.979(95%CI:0.964-0.994)for *** a cutoff level of 11.474 ng/mL,TN-C has a sensitivity of 76.0%,specificity of 85.5%,accuracy of 82.0%,positive predictive value(PPV)of 76.0%,negative predictive value(NPV)of 85.5%.Diagnostic performance of TN-C was superior to D-dimer and *** The concentration of serum TN-C in AAS patients was significantly higher than that in ACS patients and ***-C could be a new biomarker to distinguish AAS patients in the early stage after symptoms onset from other pain diseases.

关键词： acute cardiovascular elevated

Privacy Protection for Blockchain-Based Healthcare IoT Systems: A Survey

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IEEE/CAA Journal of Automatica Sinica 2024年第8期11卷 1757-1776页

作者： Minfeng Qi Ziyuan Wang qing-long Han Jun Zhang Shiping chen Yang Xiang School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyHawthorn3122VictoriaAustralia Faculty of Data Science City University of MacaoMacaoChina CSIRO Data61 SydneyNew South WalesAustralia

To enable precision medicine and remote patient monitoring,internet of healthcare things(IoHT)has gained significant interest as a promising *** the widespread use of IoHT,nonetheless,privacy infringements such as IoHT data leakage have raised serious public *** the other side,blockchain and distributed ledger technologies have demonstrated great potential for enhancing trustworthiness and privacy protection for IoHT *** this survey,a holistic review of existing blockchain-based IoHT systems is conducted to indicate the feasibility of combining blockchain and IoHT in privacy *** addition,various types of privacy challenges in IoHT are identified by examining general data protection regulation(GDPR).More importantly,an associated study of cutting-edge privacy-preserving techniques for the identified IoHT privacy challenges is ***,several challenges in four promising research areas for blockchain-based IoHT systems are pointed out,with the intent of motivating researchers working in these fields to develop possible solutions.

关键词： Blockchain internet of healthcare things(IoHT) privacy-preserving techniques(PPTs).

Phase-field method and Materials Genome Initiative(MGI)

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Chinese Science Bulletin 2014年第15期59卷 1641-1645页

作者： long-qing chen Department of Materials Science and Engineering Penn State University University Park PA 16802 USA

Predicting and controlling the microstructure evolution within a material are considered as the‘‘holy grail’’of materials science and *** important engineering materials are designed by controlling their phase transformations and microstructure *** include the improvement of mechanical properties through solid-state precipitation reactions in Nibased superalloys and age-hardened Al alloys,the useful dielectric properties and electro-mechanical coupling effects by manipulating the phase transitions in ferroelectric crystals,and the memory effect of shape-memory alloys by utilizing martensitic ***-field method has become the method of choice for modeling three-dimensional microstructure evolution for a wide variety of materials *** short article briefly discusses the potential roles that phase-field method can play in the Materials Genome Initiative.

关键词：材料科学与工程基因组计划相场方法马氏体相变超耐热合金组织演变形状记忆合金工程材料

Machine learning in energy storage materials

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Interdisciplinary Materials 2022年第2期1卷 175-195页

作者： Zhong-Hui Shen Han-Xing Liu Yang Shen Jia-Mian Hu long-qing chen Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and DevicesWuhan University of TechnologyWuhanChina International School of Materials Science and Engineering Wuhan University of TechnologyWuhanChina State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijingChina Department of Materials Science and Engineering University of Wisconsin-MadisonMadisonWisconsinUSA Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPennsylvaniaUSA

With its extremely strong capability of data analysis,machine learning has shown versatile potential in the revolution of the materials research ***,taking dielectric capacitors and lithium‐ion batteries as two representa-tive examples,we review substantial advances of machine learning in the research and development of energy storage ***,a thorough discussion of the machine learning framework in materials science is ***,we summarize the applications of machine learning from three aspects,including discovering and designing novel materials,enriching theoretical simulations,and assisting experimentation and ***,a brief outlook is highlighted to spark more insights on the innovative implementation of machine learning in materials science.

关键词： dielectric capacitor energy storage lithiumion battery machine learning

Geometric phase-encoded stimuli-responsive cholesteric liquid crystals for visualizing real-time remote monitoring:humidity sensing as a proof of concept

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Light(Science & Applications) 2024年第2期13卷 283-293页

作者： Shi-long Li Zhao-Yi chen Peng chen Wei Hu Chaohong Huang Sen-Sen Li Xuejia Hu Yan-qing Lu Lu-Jian chen Department of Electronic Engineering School of Electronic Science and EngineeringXiamen University361005 XiamenChina College of Engineering and Applied Sciences Nanjing University210093 NanjingChina Fujian Key Laboratory of Ultrafast Laser Technology and Applications Xiamen University361005 XiamenChina

Liquid crystals are a vital component of modern photonics,and recent studies have demonstrated the exceptional sensing properties of stimuli-responsive cholesteric liquid ***,existing cholesteric liquid crystal-based sensors often rely on the naked eye perceptibility of structural color or the measurement of wavelength changes by spectrometric tools,which limits their practical ***,developing a platform that produces recognizable sensing signals is *** this study,we present a visual sensing platform based on geometric phase encoding of stimuli-responsive cholesteric liquid crystal polymers that generates real-time visual patterns,rather than frequency *** demonstrate this platform’s effectiveness,we used a humidity-responsive cholesteric liquid crystal polymer film encoded with a q-plate pattern,which revealed that humidity causes a shape change in the vortex beam reflected from the encoded cholesteric liquid crystal ***,we developed a prototype platform towards remote humidity monitoring benefiting from the high directionality and long-range transmission properties of laser beams carrying orbital angular *** approach provides a novel sensing platform for cholesteric liquid crystals-based sensors that offers promising practical *** ability to generate recognizable sensing signals through visual patterns offers a new level of practicality in the sensing field with stimuli-responsive cholesteric liquid *** platform might have significant implications for a broad readership and will be of interest to researchers working in the field of photonics and sensing technology.

关键词： humidity visual liquid