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Evolution of plasticized MnO–Al2O3–SiO2-based nonmetallic inclusion in 18wt%Cr-8wt% Ni stainless steel and its properties during soaking process

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International Journal of Minerals,Metallurgy and Materials 2020年第3期27卷 328-339页

作者： jing guo Xing-run Chen Shao-wei Han Yan Yan Han-jie guo 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 Jiuquan Iron and Steel Group Corporation Jiayuguan 735100China Beijing Shougang Co.Ltd. Qian'an 064400China

The properties of MnO–Al2O3–SiO2-based plasticized inclusion are likely to change during soaking process due to its low melting point. In this study, the evolution of the MnO–Al2O3–SiO2-based inclusion of 18 wt%Cr-8 wt%Ni stainless steel under isothermal soaking process at 1250°C for different times was investigated by laboratory-scale experiments and thermodynamic analysis. The results showed that the inclusion population density increased at the first stage and then decreased while their average size first decreased and then increased. In addition, almost no Cr2O3-concentrated regions existed within the inclusion before soaking, but more and more Cr2O3 precipitates were formed during soaking. Furthermore, the plasticity of the inclusion deteriorated due to a decrease in the amount of liquid phase and an increase in the high-melting-pointphase MnO–Cr2O3 spinel after the soaking process. In-situ observations by high-temperature confocal laser scanning microscopy(CLSM) confirmed that liquid phases were produced in the inclusions and the inclusions grew rather quickly during the soaking process. Both the experimental results and thermodynamic analysis conclude that there are three routes for inclusion evolution during the soaking process. In particular, Ostwald ripening plays an important role in the inclusion evolution, i.e., MnO–Al2O3–SiO2-based inclusions grow by absorbing the newly precipitated smaller-size MnO–Cr2O3 inclusions.

关键词： nonmetallic inclusion soaking process Ostwald ripening stainless steel

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Efficient and Stable Photoassisted Lithium-Ion Battery Enabled by Photocathode with Synergistically Boosted Carriers Dynamics

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NANO-MICRO LETTERS 2025年第1期17卷 1-15页

作者： Ma, Zelin Wang, Shiyao Ma, Zhuangzhuang Li, Juan Zhao, Luomeng Li, Zhihuan Wang, Shiyuan Shuang, Yazhou Wang, Jiulong Wang, Fang Xia, Weiwei Jian, jie He, Yibo Wang, Junjie guo, Pengfei Wang, Hongqiang Northwestern Polytech Univ Ctr Nano Energy Mat State Key Lab Solidificat Proc Sch Mat Sci & Engn Xian 710072 Peoples R China NPU Shaanxi Joint Lab Graphene Xian 710072 Peoples R China Northwestern Polytech Univ Sch Mat Sci State Key Lab Solidificat Proc Xian 710072 Peoples R China Northwestern Polytech Univ Engn Dept Xian 710072 Peoples R China Northwestern Polytech Univ Ctr Adv Lubricat & Seal Mat Sch Mat Sci & Engn State Key Lab Solidificat Proc Xian 710072 Peoples R China Northwestern Polytech Univ Shenzhen Res & Dev Inst Shenzhen 518063 Peoples R China Shaanxi Normal Univ Key Lab Appl Surface & Colloid Chem Shaanxi Engn Lab Adv Energy Technol Shaanxi Key Lab Adv Energy DevicesSch Mat Sci & E Xian 710119 Peoples R China

Efficient and stable photocathodes with versatility are of significance in photoassisted lithium-ion batteries (PLIBs), while there is always a request on fast carrier transport in electrochemical active photocathodes. Present work proposes a general approach of creating bulk heterojunction to boost the carrier mobility of photocathodes by simply laser assisted embedding of plasmonic nanocrystals. When employed in PLIBs, it was found effective for synchronously enhanced photocharge separation and transport in light charging process. Additionally, experimental photon spectroscopy, finite difference time domain method simulation and theoretical analyses demonstrate that the improved carrier dynamics are driven by the plasmonic-induced hot electron injection from metal to TiO2, as well as the enhanced conductivity in TiO2 matrix due to the formation of oxygen vacancies after Schottky contact. Benefiting from these merits, several benchmark values in performance of TiO2-based photocathode applied in PLIBs are set, including the capacity of 276 mAh g(-1 ) at 0.2 A g(-1 )under illumination, photoconversion efficiency of 1.276% at 3 A g(-1 ), less capacity and Columbic efficiency loss even through 200 cycles. These results exemplify the potential of the bulk heterojunction strategy in developing highly efficient and stable photoassisted energy storage systems.

关键词： Photoassisted lithium-ion batteries Bulk heterojunction Carrier dynamics TiO2 nanofiber Plasmonic metal nanocrystals

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上矢状窦血栓形成的临床诊治

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中国基层医药 2010年第11期17卷 1492-1494页

作者：晏广李百升祝刚荆国杰惠州市中心人民医院神经外科广东省惠州516001

目的探讨上矢状窦血栓形成的临床诊治策略.方法回顾性分析7例经确诊为上矢状窦血栓形成病例的临床资料,对之早期诊断及治疗措施进行归纳、总结.结果本组7例病例中有3例为产褥期妇女,其余4例患者无特殊病史,7例患者头颅CT扫描均显示... 详细信息

目的探讨上矢状窦血栓形成的临床诊治策略.方法回顾性分析7例经确诊为上矢状窦血栓形成病例的临床资料,对之早期诊断及治疗措施进行归纳、总结.结果本组7例病例中有3例为产褥期妇女,其余4例患者无特殊病史,7例患者头颅CT扫描均显示不同程度脑水肿,表现脑沟变窄（7例）,局部脑池受压（5例）甚至消失（2例）,平扫检查显示高密度三角征2例,额叶多发小软化灶3例,合并蛛网膜下腔出血2例.DSA检查上矢状窦不显影2例、显影不均4例,动静脉循环时间延长7例,侧支循环血管扩张迂曲5例.7例患者经治疗后临床症状体征均得到改善,生活可自理,随访3年无死亡病例,无新脑出血病例.结论早期诊断治疗可降低上矢状窦血栓形成的病死率和致残率,明显改善患者预后,对于无合并脑出血的上矢状窦血栓形成患者早期行肝素钙抗凝治疗是一种有效并且安全的治疗方案.

关键词：上矢状窦血栓形成诊断治疗

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Experimental validation of sound quality simulation and optimization of a four-cylinder diesel engine

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第5期14卷 341-352页

作者： jie MAO Zhi-yong HAO Kang ZHENG guo-xi jing Department of Energy Engineering Zhejiang University

A novel sound quality simulation approach was proposed to optimize the acoustic performance of a four-cylinder diesel *** element analysis,single-input and multiple-output technology,flexible multi-body dynamics,and boundary element codes were used to acquire the hexahedron-element model,experimental modal frequencies,vibration velocities,and structurally radiated noise of the block,*** simulated modal frequencies and vibration velocities agreed well with the experimental data,which validated the finite-element *** acoustic response showed that considerable acoustic power levels existed in 1500-1900 Hz and 2300-2800 Hz as the main frequency ranges to optimize the block ***,the optimal block is determined in accordance with the novel approach,which reduces the overall value,high-frequency amplitudes,and peak values of acoustic power;thus,the loudness,sharpness,and roughness decline to make the sound quieter,lower-pitched,and smoother,***,the optimal block was cast and *** results reveal that the sound quality of the optimal-block engine is substantially improved as numerically expected,which verifies the effectiveness of the research approach.

关键词： Diesel engine Flexible multi-body dynamics Sound quality simulation Block optimization Sound quality improvement

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Distribution of oxide inclusions in H13 castings under super-gravity field with multi-stage rotation speeds

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Journal of Iron and Steel Research International 2024年第1期31卷 121-133页

作者： Shao-ying Li Xiao-jun Xi Xing-ming Zhao Han-jie guo jing guo School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials Beijing100083China Beijing Beiye Functional Materials Corporation Beijing100192China Shandong Tianwu Forming Technology Co. Ltd.Liaocheng252024ShandongChina

The 42 kg industrial H13 castings were prepared by different super-gravity fields with multi-rotation speeds,and the distribution of oxide inclusions in the castings was *** addition,the inward movement Reynolds number and inward movement time of oxide inclusions as well as the solidification time of molten steel at different positions in the castings were calculated to clarify the removal mechanism of oxide inclusions in super-gravity *** results show that the large size(i.e.,greater than 10μm)oxide inclusions are mainly concentrated in the inner and outer parts of the super-gravity castings with constant rotation speed(500 r min^(-1))and five-stage rotation speeds(500,600,750,850,and 950 r min^(-1)),respectively,while there are no large oxide inclusions in the super-gravity castings with three-stage rotation speeds(500,600,and 750 r min^(-1)).Although an increase in the particle size of inclusion and the rotation speed in super-gravity field is conducive to the increase in the inward movement Reynolds number of oxide inclusions and reduction in the inward movement time of oxide inclusions,it will reduce the local solidification time of molten *** the range of the rotation speed studied,the super-gravity field with three-stage rotation speeds has the best effect on the removal of inclusions in H13 molten steel.

关键词： Distribution Oxide inclusion H13 casting Super-gravity field Rotation speed

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Efficacy and safety of subthreshold micropulse laser in the treatment of acute central serous chorioretinopathy

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International Journal of Ophthalmology(English edition) 2023年第6期16卷 921-927页

作者： Jian-jie guo Xiu-Juan Li jing-jing Wan Department of Ophthalmology the First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450000Henan ProvinceChina

·AIM:To analyze the efficacy and safety of subthreshold micropulse laser(SML)in the treatment of acute central serous chorioretinopathy(CSC).·METHODS:This is a retrospective case analysis *** 58 eyes of 58 patients were enrolled,and they were divided into different *** 39 patients were treated with SML(SML group)and 19 patients were only observed(observation group).The follow-up period was 3mo after *** best corrected visual acuity(BCVA),central retinal thickness(CRT),superficial retinal vascular density(SRVD),deep retinal vascular density(DRVD),the superficial and deep foveal avascular zone(FAZ)area,retinal light sensitivity(RLS),perfusion area of choroidal capillary layer(CCL),subfoveal choroidal thickness(SFCT)and fundus autofluorescence(FAF)were investigated.·RESULTS:The BCVA,CRT,SRVD,DRVD,the superficial and deep FAZ area,RLS,SFCT of SML group were significantly improved at 3mo(all P0.05).At the last follow-up,the BCVA and RLS in the SML group were better than those in the observation group,and CRT was lower,SRVD and DRVD,perfusion area of CCL were larger(all P<0.05).On FAF,no change of treatment spots was found after *** structural laser damage was observed on optical coherence tomography(OCT)and optical coherence tomography angiography(OCTA),and no choroidal neovascularization was observed.·CONCLUSION:SML treatment of acute CSC can improve BCVA,RLS,and perfusion area of CCL,reduce CRT,increase SRVD and DRVD,and is safe.

关键词： central serous chorioretinopathy subthreshold micropulse laser optical coherence tomography angiography microperimetry

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Effect of slag composition on kinetic behavior of deep deoxidation of 5 wt.% Si high-silicon austenitic stainless steel

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Journal of Iron and Steel Research International 2024年第8期31卷 1873-1885页

作者： Guan-xiong Dou Han-jie guo jing guo Xue-cheng Peng Qing-yun Chen School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing 100083China Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials Beijing 100083China

Based on a thermodynamic study of 5 wt.%Si high-silicon austenitic stainless steel(SS-5Si)smelting using CaF_(2)-CaO-Al_(2)0_(3)-Mg-Si0_(2) slag to obtain a low oxygen content of less than 10×10^(-4) wt.%,a kinetic mass transfer model for deep deoxidation was established through laboratory studies,and the effects of slag components and temperature on deoxidation during the slag-steel reaction process of sS-5Si were systematically *** experimental data verified the accuracy of the model *** results showed that the final oxygen content in the steel at 1873 K was mainly controlled by the oxygen content derived from the activity of SiO_(2) regulated by the[Si]-[O]equilibrium reaction in the slag system;in particular,when the slag basicity R(R=w(CaO)/w(SiO2),where w(CaO)and w(SiO_(2))are the contents of CaO and SiO_(2) in the slag,respectively)is 3,the Al2O3 content in the slag needs to be less than 2.7%.The mass transfer rate equation for the kinetics of the deoxidation reaction revealed that the mass transfer of oxygen in the liquid metal is the rate-controlling step under different slag conditions at 1873 K,and the oxygen transfer coefficient ko.m increases with increasing the slag basicity from 4.0×10^(-6)m s^(-1)(R=1)to 4.3×10^(-5) m s^(-1)(R=3).ko.m values at R=2 and R=3 are almost the same,indicating that high slag basicity has little *** integral of the mass transfer rate equation for the deoxidation reaction of SS-5Si under different slag conditions is *** total oxygen content of the molten steel decreases with increasing basicity from an initial content of 22×10^(-4) to 3.2×10^(-4) wt.%(R=3),consistent with the change in ko.m with slag *** R=2,the slag-steel reaction takes 15 min to reach equilibrium(w[O]=5.5×10^(-4) wt.%),whereas at R=3,the slag-steel reaction takes 30 min to reach equilibrium(w[0]=3.2×10^(-4) wt.%).Considering the depth of deoxidation and reaction time of SS-5Si smelting,it is recommended the slag b

关键词： Slag-steel reaction Kinetics Rate-controlling step Deep deoxidation Transfer coefficient

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Functionalized Metal-organic Frameworks for White Light Emission and Highly Sensitive Sensing of PA and Fe^(3+)/Al^(3+)

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Chinese Journal of Structural Chemistry 2022年第3期41卷 30-39,I0007页

作者： HUANG jing-jing ZHAO Dan YIN guo-jie Luoyang Institute of Science and Technology Luoyang 471023China

Three isomorphic Ln-MOFs[Ln(bcbob)(H_(2)O)(DMF)](Ln=Tb for 1,Eu for 2,Gd for 3;DMF=N,N-dimethylformamide)have been constructed from a semi-rigid V-shaped organic linker 3,5-bis((4'-carboxyl-benzyl)oxy)benzoilate acid(H3bcbob)under solvothermal conditions.X-ray single-crystal diffraction analysis re-veals that they exhibit a two-dimensional(2D)layered *** 1~3 show the characteristic green and red emissions of Ln^(3+)and blue emission arising from the organic ligand,*** on their photo-luminescence properties,the white-light emitting materials 4 and 5 with longer fluorescence lifetime(ms grade)and higher quantum yield(e.g.40.61%for 4)are ***,1 exhibits good sensing ability on ni-troaromatic compounds,especially for picric acid(PA).In addition,1 is still a highly selective sensing material for Fe^(3+)and Al^(3+).

关键词： lanthanide organic frameworks aromatic carboxylic acid fluorescence doping chemical sensingdiiron

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Metal organic framework(ZIF-67)-derived Co nanoparticles/Ndoped carbon nanotubes composites for electrochemical detecting of tert-butyl hydroquinone

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Rare Metals 2021年第2期40卷 478-488页

作者： jing Tang Sheng-Biao Zheng Si-Xun Jiang jie Li Teng guo Jia-Hao guo College of Chemistry and Material Engineering Anhui Science and Technology UniversityBengbu233030China

In this work,the framework of Co nanoparticles and nitrogen-doped carbon nanotubes(Co/NCNTs)derived from metal-organic frameworks(MOFs)through solid pyrolysis was successfully synthesized in the atmosphere of H2 and Ar *** Co/NCNTs composites exhibited superior electrocatalytic performance for tert-butyl hydroquinone(TBHQ)oxidation due to the synergistic effect between chemical composition and the specific structure of Co nanoparticles and nitrogen-doped carbon *** was found that the reaction underwent a quasi-reversible redox reaction with 37-fold higher anodic current for TBHQ at Co/NCNT-modified electrode when compared to bare glassy carbon electrode(GCE).In optimal condition,Co/NCNTs/GCE exhibited a linear range of0.05-80.00μmol·L^(-1) for detecting TBHQ,and the limit of detection(LOD)was estimated to be as low as10 nmol·L^(-1)(signal/noise of S/N=3).Moreover,the asobtained modified electrode was successfully used to assay the content of TBHQ in edible oil samples.

关键词： Nitrogen-doped carbon nanotubes(NCNTs) ZIF-67 Tert-butyl hydroquinone Modified electrode

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盐酸多奈哌齐对轻、中型脑外伤患者认知障碍的治疗作用

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热带医学杂志 2008年第7期8卷 678-680页

作者：李雪松邬建斌荆国杰刘干忠惠州市中心人民医院神经外科惠州516001 惠州市龙门县人民医院神经外科惠州516000

目的探讨盐酸多奈哌齐对轻、中型脑外伤患者认知障碍及临床预后的影响。方法78例轻、中型脑外伤并认知障碍患者被随机分成治疗组和对照组,治疗组应用盐酸多奈哌齐10mg/d,对照组应用吡拉西坦8mg,一日3次服用,两组的治疗周期为12周。治疗... 详细信息

目的探讨盐酸多奈哌齐对轻、中型脑外伤患者认知障碍及临床预后的影响。方法78例轻、中型脑外伤并认知障碍患者被随机分成治疗组和对照组,治疗组应用盐酸多奈哌齐10mg/d,对照组应用吡拉西坦8mg,一日3次服用,两组的治疗周期为12周。治疗前及治疗后12周,分别应用简明精神状态检测量表(MMSE)、国人修订成人韦氏智利量表(WAIS-RC)和格拉斯哥预后评分(GOS)评价疗效。结果两组在治疗后12周,MMSE和WAIS-RC评分均较治疗前提高(P<0.05)。治疗后12周,治疗组MMSE和WAIS-RC评分较对照组高(P<0.05),治疗组GOS预后优良率明显优于对照组(P<0.05)。结论盐酸多奈哌齐对轻、中型脑外伤后认知障碍有积极治疗作用,并能改善临床预后。

关键词：创伤性脑损伤认知障碍临床预后多奈哌齐

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