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Hot Deformation Behavior of a New 9%Cr Heat Resistant Steel G115

Journal of Iron and Steel Research International 2013年第9期20卷 73-79页

作者： YAN Peng liu Zheng-dong liu Wei BAO han-sheng WENG Yu-qing Key Laboratory of Advanced Material of Ministry of Eclucation of China School of Materials Science and EngineeringTsinghua University Institute for Special Steels China Iron and Steel Research Institute

The hot deformation behavior of a new heat resistant steel Gl15 designed for 650 ℃ ultra-supercritical （USC） power plants was experimentally studied. Hot compression test was carried out in the temperature range of 900-1 200 ℃ and the strain rate range of 0.1-20 s i by using Gleeble 3800 thermal-mechanical simulator, and the corresponding flow curves were obtained. Experimental results show that the flow stress increases with the decrease of deformation temperature and the increase of strain rate. The hot deformation activation energy of G115 steel was determined to be 494 kJ/mol and the constitutive equation was also obtained. For convenience of the practical applica-tion, a good approximate equation was obtained for calculating the peak stress values of Gl15 steel under different deformation conditions. At the strain value of 0.9, natural logarithm of the critical Zener Hollomon parameter Zc of Gl15 steel was determined to be in the scope of 49.67 and 50.65, above which there will be no dynamic recrystalliza-tion （DRX）. And natural logarithm of the critical Zener-Hollomon parameter Zc of Gl15 steel was determined to be in the scopes of 45.58 and 46.27, below which full DRX may occur. Then, the status diagram of dynamic micro structures of G115 steel was established. In addition, the strain rate sensitivity of Gl15 steel is not constant during the test temperature range and it increases linearly from 900 to 1 200 ℃. Therefore, hot deformation at higher tem- peratures would obtain better workability.

关键词： heat resistant steel G115 hot deformation dynamic recrystallization constitutive equation Zener Hol-lomon parameter

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Asymptotics for null-timelike boundary problems for general linear wave equations

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Science China Mathematics 2021年第1期64卷 111-128页

作者： qing han Lin Zhang Department of Mathematics University of Notre DameNotre DameIN46556USA Institute of Mathematics Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing100190China

We study the linear wave equation□gu=0 in Bondi-Sachs coordinates,for an asymptotically flat Lorentz metric *** consider the null-timelike boundary problem,where an initial value is given on the null surfaceτ=0 and a boundary value on the timelike surface r=*** obtain spacetime Hp-estimates of ru for r>r0 and derive an asymptotic expansion of ru in terms of 1/r as r→∞.

关键词： wave equations radiation field energy estimates asymptotic expansion

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Anomalous quality factor evolution of induced transparency in a virtualized coupled-oscillator system

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 148-155页

作者： Yunhan Yang han Jia Tuo liu Yuzhen Yang Jun Yang Key Laboratory of Noise and Vibration Research Institute of Acoustics Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Acoustics Institute of Acoustics Chinese Academy of Sciences

The phenomenon of induced transparency, characterized by a high quality(Q) factor, holds significant importance in the fields of high-precision sensing, energy storage and wave manipulation. Conventional transparency systems are often constrained by the limited experimentally accessible parameter space and the lack of independent control over intrinsic parameters, thereby hindering advanced research on high-Q effects. Here we propose a virtualized coupled-oscillator system that enables reconfigurable induced transparency in the reflection spectrum. By virtually incorporating a pair of coupled oscillators into an individual acoustic meta-atom, we achieve the manipulation of induced transparency in a decoupled, wide-ranging, and elaborate manner. Exploiting the diverse evolutions across the intrinsic parameter space, we show experimentally a counter-intuitive increase in the Q-factor of the transparency window, which is attributed to the enhanced dissipation of the bright ***, a constant group delay at the center frequency is observed accompanying this evolution. Our work demonstrates an intriguing platform as well as a novel strategy to engineer high-Q induced transparency phenomenon, and paves the way towards applications in programmable acoustic sensors, filters and slow-wave devices.

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A rare occurrence of a hereditary Birt-Hogg-Dubésyndrome:A case report

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World Journal of Clinical Cases 2021年第24期9卷 7123-7132页

作者： You-Ran Lu qing Yuan Jian liu Xue han Min liu qing-Quan liu Yu-Guang Wang Department of Respiration Beijing Traditional Chinese Medicine Hospital Affiliated to Capital Medical UniversityBeijing 100010China Department of Imaging Traditional Chinese Medicine Hospital Affiliated to Capital Medical UniversityBeijing 100010China Department of Pathology Traditional Chinese Medicine Hospital Affiliated to Capital Medical UniversityBeijing 100010China

BACKGROUND Birt-Hogg-Dubé(BHD)syndrome is a rare autosomal dominant disease caused by germline mutations in the folliculin(FLCN)protein gene,which usually manifests as cutaneous fibrofolliculoma,pulmonary cysts,renal cell carcinoma,and spontaneous *** SUMMARY A 26-year-old woman with no history of smoking was admitted to the Respiratory Department of our hospital due to intermittent wheezing that lasted for 8 *** had experienced recurrent spontaneous pneumothorax more than four times during the past 8 *** admission,the patient again suffered from left pneumothorax without a clear *** computed tomography(CT)showed multiple low-density cystic changes in both *** examination on admission revealed multiple white dome-shaped papules in the neck,the nape,and behind the *** addition,the patient had a family history of spontaneous *** mother had suffered from pneumothorax four times(at age 36,37,42,and 50 years).Her second maternal aunt had suffered from a right pneumothorax at the age of *** multidisciplinary diagnosis of BHD,which included the Respiratory Department,Radiology Department,Pathology Department,and Dermatological Department,was BHD and was later confirmed by family genetic *** same variation(FLCN gene)was found in the patient’s mother and *** This case highlights the importance of multidisciplinary diagnosis and a treatment platform for the diagnosis of BHD.

关键词： Birt-Hogg-Dubésyndrome Spontaneous pneumothorax Cystic lesions in the lungs Multidisciplinary diagnosis and treatment Germline mutations in the folliculin Case report

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Oxygen vacancies with localized electrons direct a functionalized separator toward dendrite-free and high loading LiFePO_(4)for lithium metal batteries

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Journal of Energy Chemistry 2022年第12期75卷 38-45,I0002页

作者： Qi An qing liu Shimin Wang Lixiang liu han Wang Yongjiang Sun Lingyan Duan Genfu Zhao Hong Guo School of Materials and Energy Yunnan UniversityNo.2Green Lake North RoadKunming 650091YunnanChina Institute for Integrative Nanosciences Leibniz IFW DresdenHelmholtzstraße 2001069 DresdenGermany

The pursuit of high energy density has promoted the development of high-performance lithium metal batteries(LMBs).However,the underestimated but non-negligible dendrites of Li anode have been observed to shorten battery ***,a composite separator(TiO_(2-x)@PP),in which TiO_(2)with electron-localized oxygen vacancies(TiO_(2-x))is coated on a commercial PP separator,is fabricated to homogenize lithium ion transport and stabilize the lithium anode *** the utilization of TiO_(2-x)@PP separators,the symmetric lithium metal battery displays enhanced cycle stability over 800 h under a high current density of 8 m A cm^(-2).Moreover,the LMBs assembled with high-loading LiFePO_(4)(9.24 mg cm^(-2))deliver a stable cycling performance over 900 cycles at a rate of 0.5 *** theoretical studies based on density functional theory(DFT)further unveil the *** favorable TiO_(2-x)is beneficial for facilitating fast Li+migration and impeding anions *** addressing the Li dendrite issues,the use of TiO_(2-x)@PP separator potentially provides a facile and attractive strategy for designing well-performing LMBs,which are expected to meet the application requirements of rechargeable batteries.

关键词： Oxygen vacancy Ionic transport regulation Dendrite-free Localized electrons High loading

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Deciphering the molecular mechanisms of Simiaowan in the treatment of hyperuricemia: in vivo and in silico approaches

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Traditional Medicine Research 2025年第2期10卷 37-54页

作者： Yong-Chang Zeng Jun-Hong Wu Dan-Dan Xu Kang He Chang-qing liu Li-Fei Song Zheng-Zhi Wu Qian-Qian Jiang Shao-Yu Liang Department of Neurology The First Affiliated Hospital of Shenzhen UniversityShenzhen 518020China Pharmaceutical Department The Affiliated TCM Hospital of Guangzhou Medical UniversityGuangzhou 510000China School of Pharmacy Guizhou University of Traditional Chinese MedicineGuiyang 550025China Guangzhou Zeli Medical Technology Co. Ltd.Guangzhou 510700China

Background:Simiaowan(SMW),a well-known traditional Chinese medicine,has been employed to treat hyperuricemia(HUA)and gout for ***,the bioactive components and underlying mechanisms have not been *** objective of this study was to identify the active components and potential mechanisms of SMW by integrating pharmacological experimentation,serum pharmacochemistry,network pharmacology and molecular ***:HUA rats modelling by high-fat/high-sugar diet and potassium oxonate/adenine oral administration were used to evaluate the pharmacodynamic effects of ***-Q-Exactive-MS/MS was employed to detect the bioactive components present in SMW-containing *** pharmacology and molecular docking were utilized to elucidate the potential targets and underlying ***:SMW effectively ameliorated HUA rats via the inhibition of uric acid(UA)production,promotion of UA excretion,improvement of lipid and glucose metabolic abnormalities,antioxidant,anti-inflammatory and anti-insulin resistance effects.A total of 73 compounds detected in SMW-containing serum were identified as potential active components,with alkaloids,flavonoids,organic acids,and terpenoids emerging as the primary active *** 203 corresponding targets were obtained as SMW anti-HUA/gout targets,which mainly participated in apoptosis,insulin resistance,TNF,PI3K-Akt,HIF-1,NF-κB,MAPK,IL-17 and TLR signaling *** docking indicated that active compounds(***,phellodendrine,quercetin,formononetin,ferulic acid)had superior binding abilities to the key targets(*** carrier family 22 member 12(URAT1),solute carrier family 22 member 6(OAT1),ATP-binding cassette sub-family G member 2(ABCG2),solute carrier family 2,facilitated glucose transporter member 9(GLUT9),xanthine dehydrogenase/oxidase(XDH),transcription factor p65(RELA),toll-like receptor 4(TLR4),prostaglandin G/H synthase 2(PTGS2),caspase-3(CASP3),insulin(INS)).Conclusion:S

关键词： hyperuricemia network pharmacology serum pharmacochemistry Simiaowan UPLC-Q-Exactive-MS/MS

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F+ Ion Implantation for Enhancing Surface Hydrophobicity of Medical Polymethylmethacrylate

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Chinese Physics Letters 1998年第9期15卷 662-664页

作者： liu Bao-jun LI De-jun GU han-qing Department of Physics Tianjin Normal UniversityTianjin 300074 Department of Materials Science and Engineering Tsinghua UniversityBeijing 100084 Institute of Uretic Surgery Tianjin 300211

The surface of medical polymethylmethacrylate intraocular lens was treated by F^(+) ion implantation at 80 keV with various *** test showed that contact angle was increased from 68.5ºto 83.5ºwith increasing *** appreciable changes in optical transparency and tensile strength were observed.X-ray photoelectron spectroscopy and electron spin resonance analysis indicated that F+ion implantation broke some original O-containing groups to form some new C-F bond and radicals on the surface.

关键词： implantation strength transparency

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Some nonlinear parameters of PP intervals of pulse main peaks

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第8期8卷 1256-1262页

作者： han qing-peng WANG Ping School of Biomedical Engineering and Instrument Science Zhejiang University Hangzhou 310027 China

The PP intervals of pulse main peaks from healthy and unhealthy people(arrhythmia) have different nonlinear char-acteristics. In this paper,the extraction of PP intervals of pulse main peaks is achieved by picking up P peaks of pulse wave with wavelet transform. Furthermore,several nonlinear parameters(correlative dimensions,maximum Lyapunov exponents,com-plexity and approximate entropy) of the PP intervals of pulse main peaks extracted from normal and unhealthy pulse signals are calculated,with the results showing that these nonlinear parameters calculated from the main wave interval signals are helpful for analyzing human's health state and diagnosing heart diseases.

关键词： PP intervals of pulse main peaks Phase space reconstruction Correlative dimension Lyapunov exponent Complexity Approximate entropy

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Effect of Dissolved and Precipitated Niobium in Microalloyed Steel on Deformation Induced Ferrite Transformation(DIFT)

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Journal of Iron and Steel Research International 2009年第4期16卷 67-71页

作者： liu qing-you DENG Su-huai SUN Xin-jun DONG han WENG Yu-qing Central Iron and Steel Research Institute Beijing 100081 China Chinese Society for Metal Beijing 100711 China

Hot deformation processing was designed to study the effects of niobium （Nb） on DIFT. A prestrain of 0.51 at 880 ℃ for different isothermal time was used for adjusting the deformed austenite constitution and Nb existing state, followed by a secondary heavy deformation at 780 ℃ for inducing the ferrite transformation. The volume fraction and grain size of deformation induced ferrite （DIF） obtained at different isothermal time between double hits were investigated. It was found that Nb dissolved in austenite is adverse to DIFT; however, the precipitation of Nb is beneficial to DIFT. As Nb plays the role in the conventional TMCP, Nb retards the recrystallization of deformed austenite and enhances the deformation stored energy in the multipass deformation, and in result, Nb promotes DIFT.

关键词： niobium precipitation recrystallization deformation induced ferrite transformation

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Experimental investigation into the salinity effect on the physicomechanical properties of carbonate saline soil

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第5期16卷 1883-1895页

作者： Jiejie Shen qing Wang Yating Chen Xuefei Zhang Yan han Yaowu liu College of Construction Engineering Jilin UniversityChangchun130026China Shandong Zhengyuan Geological Resources Exploration Co.Ltd. Jinan250013China China Renewable Energy Engineering Institute Beijing100120China

For engineering structures with saline soil as a filling material,such as channel slope,road subgrade,etc.,the rich soluble salt in the soil is an important potential factor affecting their safety *** study examines the Atterberg limits,shear strength,and compressibility of carbonate saline soil samples with different NaHCO3 contents in Northeast *** mechanism underlying the influence of salt content on soil macroscopic properties was investigated based on a volumetric flask test,a mercury intrusion porosimetry(MIP)test,and a scanning electron microscopic(SEM)*** results demonstrated that when NaHCO3 contents were lower than the threshold value of 1.5%,the bound water film adsorbed on the surface of clay particles thickened continuously,and correspondingly,the Atterberg limits and plasticity index increased rapidly as the increase of sodium ion ***,the bonding force between particles was weakened,the dispersion of large aggregates was enhanced,and the soil structure became ***,the compressibility increased and the shear strength(mainly cohesion)decreased by 28.64%.However,when the NaHCO3 content exceeded the threshold value of 1.5%,the salt gradually approached solubility and filled the pores between particles in the form of crystals,resulting in a decrease in soil *** cementation effect generated by salt crystals increased the bonding force between soil particles,leading to a decrease in plasticity index and an improvement in soil mechanical ***,this work provides valuable suggestions and theoretical guidance for the scientific utilization of carbonate saline soil in backfill engineering projects.

关键词： Carbonate saline soil Salt content Physicomechanical properties Bound water Microstructure

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