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On the mechanism of Si-promoted destabilization of Tic_(x)particles in Al alloys

Journal of Materials Science & Technology 2023年第34期165卷 17-26页

作者： H.Dong y.c.guo y.Z.chen F.Xia Q.Q.guo Q.chen G.L.Li J.y.Zhao y.Zhong J.P.Li School of Materials and chemical Engineering Xi’an Technological UniversityXi’an 710021China State Key Lab.of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China School of Science Xi’an University of Science and TechnologyXi’an 710054China

Tic_(x)is an excellent composite strengthening particle and grain refiner for Al ***,the stability of Tic_(x)is poor when solute Si exists in Al alloy melts,which significantly depresses its strengthening and grain refining *** this work,the destabilization mechanisms of the Tic_(x)particles in Al-Si alloy melt with a composition of Al-7Si-7.5Tic were explored via experiments,first-principles calculations and thermodynamic *** experimental results show that Si atoms diffuse into Tic_(x)and Ti atoms are released into the Al melt to form a Ti-rich transition zone during the insulation of Tic_(x)in Al-Si melt,and the TiAlySiz and Al_(4)c_(3)phases are solidified in the Ti-rich zone and at Ti-rich zone/Tic_(x)interface,*** first principles calculations show that the low formation energy of c vacancies facilitates the rapid diffusion of Si atoms in Tic_(x),while the doping of Si atoms reduces the energy barrier of diffusion of Ti atoms in Tic_(x)and promotes the formation of Ti-rich *** thermodynamic calculations show that the wide crystallization temperature range of the destabilized product TiAlySiz phase is the key to continuous decomposition of Tic_(x)*** addition,the driving force of the main destabilization reaction of Tic_(x)in the Al-Si alloys is about 44 times higher than that in the Al alloys without Si *** indicates that the presence of solute Si remarkably promotes the subsequent decomposition process of Tic_(x)in the Al-Si alloy melts.

关键词： Al-Si alloy Tic_(x)particles Destabilization First principles calculations Thermodynamics

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cognition on oxidation behavior of Ni-based superalloy GH4742 when exposed to water vapor

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Journal of Materials Science & Technology 2024年第7期174卷 15-22页

作者： H.Xu S.F.yang E.H.Wang c.y.guo y.S.Liu X.M.Hou y.L.Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Institute for carbon Neutrality University of Science and Technology BeijingBeijing 100083China

The oxidation behavior of Ni-based superalloy GH4742 exposed to water vapor was investigated at 900-1100℃for 50 h in Ar+20%H_(2)O,with Ar+20%O_(2)included for *** presence of H_(2)O is adverse to formation of continuous cr_(2)O_(3)oxide layer but contributes to generation of big *** on this,Ni^(2+)and co^(2+)are more easily to diffuse towards the outermost oxide layer(OOL),forming non-protective Ni-and co-rich oxides with high *** leads to a higher weight gain in Ar+20%H_(2)O than that in Ar+20%O_(2).At elevated temperatures,the spallation of oxide scale occurs while the consumption of cr is reduced in Ar+20%H_(2)O,and the contents of Ni-and co-rich oxides at this moment are reduced in the *** oxidation mechanism was also discussed.

关键词： GH4742 Superalloy H_(2)O Diffusion Oxidation Mechanism

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Heavy fermions in high magnetic fields

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chinese Physics B 2019年第1期28卷 25-38页

作者： M Smidman B Shen c y guo L Jiao X Lu H Q yuan center for correlated Matter and Department of Physics Zhejiang UniversityHangzhou 310058China collaborative Innovation center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Heavy fermion materials are prototypical strongly correlated electron systems, where the strong electron–electron interactions lead to a wide range of novel phenomena and emergent phases of matter. Due to the low energy scales, the relative strengths of the Ruderman–Kittel–Kasuya–yosida(RKKy) and Kondo interactions can often be readily tuned by non-thermal control parameters such as pressure, doping, or applied magnetic fields, which can give rise to quantum criticality and unconventional superconductivity. Here we provide a brief overview of research into heavy fermion materials in high magnetic fields, focussing on three main areas. Firstly we review the use of magnetic fields as a tuning parameter,and in particular the ability to realize different varieties of quantum critical behaviors. We then discuss the properties of heavy fermion superconductors in magnetic fields, where experiments in applied fields can reveal the nature of the order parameter, and induce new novel phenomena. Finally we report recent studies of topological Kondo systems, including topological Kondo insulators and Kondo–Weyl semimetals. Here experiments in magnetic fields can be used to probe the topologically non-trivial Fermi surface, as well as related field-induced phenomena such as the chiral anomaly and topological Hall effect.

关键词： heavy fermions high magnetic fields quantum phase transitions heavy fermion superconductivity topological Kondo systems

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Acquired sensorineural hearing loss,oxidative stress,and microRNAs

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Neural Regeneration Research 2025年第9期20卷 2513-2519页

作者： Desmond A.Nunez Ru c.guo Division of Otolaryngology–Head&Neck Surgery Department of SurgeryFaculty of MedicineThe University of British ColumbiaVancouverBCCanada Division of Otolaryngology–Head&Neck Surgery Gordon&Leslie Diamond Health Care CentreVancouver General HospitalVancouverBCCanada Faculty of Medicine–The University of British columbia VancouverBCCanada

Hearing loss is the third leading cause of human ***-related hearing loss,one type of acquired sensorineural hearing loss,is largely responsible for this escalating global health ***-induced,ototoxic,and idiopathic sudden sensorineural are other less common types of acquired hearing *** etiology of these conditions is complex and multi-fa ctorial involving an interplay of genetic and environmental *** stress has recently been proposed as a likely linking cause in most types of acquired sensorineural hearing *** non-coding RNA sequences known as microRNAs(miRNAs)have increasingly been shown to play a role in cellular hypoxia and oxidative stress responses including promoting an apoptotic *** hair cell death is a central histopathological finding in sensorineural hearing *** these cells do not regenerate in humans,it underlies the irreversibility of human age-related hearing *** EMBASE,Ovid MEDLINE,Web of Science core collection,and *** databases over the period August 1,2018 to July 31,2023 were searched with"hearing loss,""hypoxamiRs,""hypoxia,""microRNAs,""ischemia,"and"oxidative stress"text words for English language primary study publications or registered clinical *** red clinical trials known to the senior author we re also assessed.A total of 222studies were thus *** excluding duplicates,editorials,retra ctions,secondary research studies,and non-English language articles,39 primary studies and clinical trials underwent full-text *** resulted in 11 animal,in vitro,and/or human subject journal articles and 8 registered clinical trial database entries which form the basis of this narrative *** miR-34a and miR-29b levels increase with age in *** miRNAs were demonstrated in human neuroblastoma and murine cochlear cell lines to target Sirtuin 1/peroxisome proliferato r-activated receptor gamma coactivator-1-alpha(SIRT1/P Gc-1α),SIRT

关键词： hearing loss hypoxia microRNAs oxidative stress sensorineural

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永续洪水滞流池地表及地下系统

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中国水利水电科学研究院学报 2006年第2期4卷 101-106页

作者：郭纯园许守靖郑炎杰科罗拉多大学丹佛 Parsons Brinckerhoff Inc. Aurora市科罗拉多

近年来运用最佳都市排水管理实践(Best Management Practices or BMPs)开发出许多新排水系统设计方法并开始广泛应用,例如使用高透水率的路面都市绿带、干井、渗透式集水池、沟渠、湿地以及滞流池等。这些设施均具有有效的滞流功能。多... 详细信息

近年来运用最佳都市排水管理实践(Best Management Practices or BMPs)开发出许多新排水系统设计方法并开始广泛应用,例如使用高透水率的路面都市绿带、干井、渗透式集水池、沟渠、湿地以及滞流池等。这些设施均具有有效的滞流功能。多年来,不当积水、延长排水和下水道堵塞等,造成了一些都市排水的失败。事实证明,许多问题的产生常常是因为滞流池设计方法只考虑地表水文学而忽略地下水层的种种因素。结果,当地下水层渗流无法接纳表面渗透时,导至整个滞流系统无法良好运作。本文提出一个新概念,在设计洪水滞流池时,应考虑地表水文及地下水文对系统运作的影响,并通过3个实例说明了设计滞流池容量、几何形状及其永续运作的持续力的计算方法。

关键词：地下水滞洪池系统渗透式集水池湿地滞流池

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cLINIcAL APPLIcATION OF ANTITAcHycARDIA PAcEMAKER: A REPORT OF 6 cASES

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中华医学杂志(英文版) 1988年第10期101卷 736-736页

作者： R L Sun c y guo S J Hu P Z yu R G Tian X chen Institute of cardiovascular Diseases and Fu Wai Hospital Chinese Academy of Medical Sciences Beijing

Antitachycardia pacemaker is one of the new developments in pacing technique. It can be used to control paroxysmal supraventricular tachycardia (PSVT) due to circus movement. The pacer emits pulses according to the preset program to terminate the tachycardia. clinical experiences in six patients are reported. All are men, aged 23-61. Five had atrioventricular re-entrant tachycardia and the other one had atrioventricular nodal re-entrant tachycardia. PASAR 4171 was used in five patients and Intertach 262-12 in one. Atrial electrode was used in five while ventricular electrode in the other one due to intermittent paroxysmal atrioventricular block. The results are satisfactory. Before implantation they all had very frequent episodes of PSVT that could not be effectively controlled by antiarrhythmia drugs. In an average follow-up period of 11 months after implantation, none of the patients had sustained PSVT and needed antiarrhythmia drugs except one who had occasional atrial fibrillation and amiodaronc was used. clinical application of antitachycardia pacemaker was discussed.

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caH2-promoted activity of Ni-carbonate interface for cO2 methanation

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Journal of Energy chemistry 2025年第1期100卷 522-532页

作者： Jin-Peng Wang guo-cui Mao Hui-Lin Jiang Bao-Xia Dong yun-Lei Teng School of chemistry and chemical Engineering Yangzhou University

Transition metal-carbonate interfaces often act as active sites in heterogeneous catalytic *** interface between transition metal and metal carbonate exhibits a dynamic equilibrium during the cO2hydrogenation reaction,involving surface carbonate hydrogenation and ***,there have been few reports on engineering the activity of the interface between transition metal and alkaline earth metal carbonate for catalytic *** work demonstrated that the incorporation of caH2in Ni/cacO3enhances the cO2methanation activity of the *** cO2conversion for Ni/caH2-cacO3reached 68.5%at 400°c,which was much higher than that of the Ni/cacO3（31.6%） and Ni/caH2-caO （42.4%） ***,the Ni/caH2-cacO3catalysts remained stable during the stability test for 24 h at 400°c and 8 *** research revealed that caH2played a crucial role in promoting the activity of the Ni-carbonate interface for ***2could modify the electronic structure of Ni and tune the structural properties of cacO3to generate medium basic sites （OH groups）,which are favorable for the activation of H2and ***-situ Fourier transform infrared spectroscopy （FTIR） analysis combined with density functional theory calculations demonstrated that cO2activation occurs at the hydroxyl group （OH） on the caH2-modified Ni-carbonate surface,leading to the formation of cO3H****,our study has confirmed that cO2methanation over the Ni/caH2-cacO3catalysts proceeds via the formate pathway.

关键词： Metal hydride Ni catalysts carbonate Metal-carbonate interface

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多序列MRI全肿瘤纹理分析预测软组织肉瘤新辅助放疗和靶向治疗的病理完全缓解

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国际医学放射学杂志 2023年第4期 493-493页

作者： L.Miao y.cao L.J.Zuo H.T.Zhang c.y.guo Z.y.yang 陈繁

摘要目的建立基于多序列MRI全肿瘤纹理分析的软组织肉瘤（STS）病人新辅助放疗（RT）和靶向治疗的有效预测模型。方法对前瞻性Ⅱ期试验中所纳入的30例四肢或躯

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Defect Engineering with Rational Dopants Modulation for High-Temperature Energy Harvesting in Lead-Free Piezoceramics

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NANO-MIcRO LETTERS 2025年第1期17卷 1-15页

作者： Xi, Kaibiao guo, Jianzhe Zheng, Mupeng Zhu, Mankang Hou, yudong Beijing Univ Technol Coll Mat Sci & Engn Key Lab Adv Funct Mat Minist Educ Beijing 100124 Peoples R China

High temperature piezoelectric energy harvester (HT-PEH) is an important solution to replace chemical battery to achieve independent power supply of HT wireless sensors. However, simultaneously excellent performances, including high figure of merit (FOM), insulation resistivity (rho) and depolarization temperature (T-d) are indispensable but hard to achieve in lead-free piezoceramics, especially operating at 250 degrees c has not been reported before. Herein, well-balanced performances are achieved in BiFeO3-BaTiO3 ceramics via innovative defect engineering with respect to delicate manganese doping. Due to the synergistic effect of enhancing electrostrictive coefficient by polarization configuration optimization, regulating iron ion oxidation state by high valence manganese ion and stabilizing domain orientation by defect dipole, comprehensive excellent electrical performances (T-d = 340 degrees c, rho(250) (degrees c) > 10(7) Omega cm and FOM2(50 degrees c) = 4905 x 10(-15 )m(2) N-1) are realized at the solid solubility limit of manganese ions. The HT-PEHs assembled using the rationally designed piezoceramic can allow for fast charging of commercial electrolytic capacitor at 250 degrees c with high energy conversion efficiency (eta = 11.43%). These characteristics demonstrate that defect engineering tailored BF-BT can satisfy high-end HT-PEHs requirements, paving a new way in developing self-powered wireless sensors working in HT environments.

关键词： Lead-free piezoceramic Defect engineering Dopants modulation High-temperature Piezoelectric energy harvester

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Microstructural evolution during the progressive transformation-induced plasticity effect in a Fe-0.1c-5Mnmedium manganese steel

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 369-379页

作者： Mei Zhang Wenhao Li yangfei chen yang Jiang Xiaofei guo Han Dong School of Materials Science and Engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

The microstructural evolution of a cold-rolled and intercritical annealed medium-Mn steel(Fe-0.10c-5Mn)was investigated during uniaxial tensile ***-situ observations under scanning electron microscopy,transmission electron microscopy,and X-ray diffraction analysis were conducted to characterize the progressive transformation-induced plasticity process and associated fracture initiation *** findings were discussed with the local strain measurements via digital image *** results indicated that Lüders band formation in the steel was limited to 1.5%strain,which was mainly due to the early-stage martensitic phase transformation of a very small amount of the less stable large-sized retained austenite(RA),which led to localized stress concentrations and strain hardening and further retardation of *** small-sized RA exhibited high stability and progressively transformed into martensite and contributed to a stably extended Portevin-Le chatelier *** volume fraction of RA gradually decreased from 26.8%to 8.2%prior to *** the late deformation stage,fracture initiation primarily occurred at the austenite/martensite and ferrite/martensite interfaces and the ferrite phase.

关键词： medium-Mn steel retained austenite progressive transformation-induced plasticity effect local strain fracture initiation

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