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Effect of Zr on undissolved phases and carbide precipitation in Ti microalloyed low-carbon steel

Journal of Iron and Steel Research International 2019年第7期26卷 720-732页

作者： peng-cheng liu Jian-chun Cao Shu-biao Yin Yin-hui Yang peng Gao Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming 650093 Yunnan China Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 Yunnan China

The undissolved phases and carbide precipitation in Ti and Ti-Zr microalloyed low-carbon steels were investigated by scanning electron microscopy, transmission electron microscopy and energy-dispersive X-ray spectrometry. At 1225℃, the replacement of Ti by Zr formed Zr2CS and (Zr, Ti)N (the Ti/Zr atomic ratio is 0.11) and reduced the consumption of Ti. At 925℃, it was identified that TiC phases were precipitated at first and Zr was incorporated into the TiC lattice in the subsequent precipitation process, which promoted the precipitation of titanium carbide. The calculation of the interaction coefficient between Ti, C, N and Zr showed that Zr reduced the activity of Ti and C and increased the activity of N in the iron matrix. Therefore, with the addition of Zr, the solubility of Ti was increased, and the consumption of Ti was reduced at high temperature in Ti microalloyed low-carbon steel. The thermodynamic calculation of carbide precipitation transformation showed that the replacement of Ti by Zr increased the nucleation driving force and the nucleation rate of titanium carbide, while the critical core size and the critical nuclear energy were reduced. As the holding time was extended, the Zr/ Ti atomic ratio increased and the size of the precipitates also increased. When the Zr/Ti atomic ratio reached a certain level, the size of the precipitates did not increase with further increase in atomic ratio. When the Zr/Ti atomic ratio in (Ti, Zr)C was 0.05-0.17,(Ti, Zr)C was the most stable carbide and the easiest to nucleate at 925℃. There was more of the (Ti, Zr)C phase than TiC at 925 ℃ after 50 and 100 s, and the time to complete the coarsening behavior of (Ti, Zr)C was shorter than that of TiC.

关键词： Ti-Zr microalloyed steel Undissolved phase Carbide precipitation Zirconium Thermodynamics

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Influence of chromium on the initial corrosion behavior of low alloy steels in the CO_2–O_2–H_2S–SO_2 wet–dry corrosion environment of cargo oil tankers

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International Journal of Minerals,Metallurgy and Materials 2015年第8期22卷 829-841页

作者： Qing-he Zhao Wei liu Jie Zhao Dong Zhang peng-cheng liu Min-xu Lu Institute for Advanced Materials and Technology University of Science and Technology Beijing Marine Product Management Department China Classification Society Headquarters

The influence of Cr on the initial corrosion behavior of low-alloy steels exposed to a CO2–O2–H2S–SO2 wet–dry corrosion environment was investigated using weight-loss measurements, scanning electron microscopy, N2 adsorption tests, X-ray diffraction analysis, and electrochemical impedance spectroscopy. The results show that the corrosion rate increases with increasing Cr content in samples subjected to corrosion for 21 d. However, the rust grain size decreases, its specific surface area increases, and it becomes more compact and denser with increasing Cr content, which indicates the enhanced protectivity of the rust. The results of charge transfer resistance(Rct) calculations indicate that higher Cr contents can accelerate the corrosion during the first 7 d and promote the formation of the enhanced protective inner rust after 14 d; the formed protective inner rust is responsible for the greater corrosion resistance during long-term exposure.

关键词： low alloy steels corrosion rate chromium rust oil

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Increasing leaching rate of gold cyanide of two-stage calcination generated from refractory ore containing arsenopyrite and pyrrhotite

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Rare Metals 2016年第10期35卷 804-810页

作者： Xiao-E Dang Wen-Shuai Ke Chen Tang Jun Lv Xue Zhou cheng-peng liu Key Laboratory for Gold and Resources of Shaanxi Xi'an University of Architecture and Technology Jin Rui Mining Technology Development Co. Ltd

For the gold locked within hematite in the two- stage calcination, which leads to a low gold leaching rate, the present work is aiming at pretreating the calcination to selectively dissolve hematite. The calcination was pre- treated by sulfuric acid with cosolvent B. The factors in- fluencing the hematite dissolution rate were studied, and the pretreatment parameters considered were H2SO4 con- tent, B dosage and added time, leaching temperature and time. Simultaneously, mineralogy analysis of the calcination, H2SO4 pretreatment residue and cyanide leaching residue were also carried out. Results indicate that the hematite dissolution rate is quicker, the dissolution tem- perature is lower and the dissolution time is shorter in the role of cosolvent B than without B. At the same time, the gold locked within hematite is effectively released, so the leaching rate of gold cyanide increases about 10 % than that in actual factory production. The results have an actual significance in guiding industrial production.

关键词： Locked gold Hematite Pretreatment Two-stage calcination Cosolvent B

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Repair of a severe palm injury with anterolateral thigh and ilioinguinal flaps: A case report

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World Journal of Clinical Cases 2021年第2期9卷 502-508页

作者： Hong-Yang Gong Xi-Guang Sun Lai-Jin Lu peng-cheng liu Xin Yu Hand and Foot Surgery The First Hospital of Jilin UniversityChangchun 130021Jilin ProvinceChina

BACKGROUND In daily life and work,there are more and more patients with trauma to the hand,which often results in skin and soft tissue *** there are many repair methods,the function and appearance of the fingers will be adversely affected if the repair is *** SUMMARY In the present report we describe an 18-year-old male patient whose right hand was mangled by a machine.X-ray imaging showed that a right hand bone(middle finger)was absent and the alignment was *** hospitalization,he was diagnosed with a severe right hand injury,skin and soft tissue defects,partial finger defects,and a skin degloving *** underwent reconstructive surgery with anterolateral thigh and ilioinguinal *** two repair operations,satisfactory results were obtained,including good fracture healing,good skin flap shape,and good wrist joint *** This case highlights the good effect of anterolateral thigh and ilioinguinal flaps repair technique on severe palm injury.

关键词： Palm injury Mechanical damage Anterolateral thigh flap Ilioinguinal flap Case report

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Research on focal nodular hyperplasia with MSCT and postprocessing

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World Journal of Gastroenterology 2009年第38期15卷 4838-4843页

作者： Yuan-Jian liu Wei-Jun Fan Zhi-Dong Yuan peng-cheng liu Chun-Rong Wang Wei-Qiang Yan Su-Mei Wang Jun-Hui Chen Zheng liu Imaging Center Peking University Shenzhen HospitalShenzhen 518036 Guangdong Province China State Key Laboratory of Oncology in Southem China Imaging and Interventional Center Cancer Center Sun Yat-sen University Guangzhou 510060 Guangdong Province China

AIM： To investigate and evaluate the pathological features and diagnostic value of focal nodular hyperplasia （FNH） with multiection spiral computed tomography （MSCT） and postprocessing. METHODS： A total of 25 patients with FNH who had undergone MSCT and postprocessing were included in the investigation. All patients had been pathologically or clinically confirmed with FNH. A number of 75 cases of hepatic carcinomas, hemangiomas and adenomas were randomly selected at a same period for a comparative study. RESULTS： There was a single focus in 22 cases and multiple foci in 3 cases. On the plain scan, 17 lesions showed hypodensity, 7 isodensity and 4 hyperdensity （the case with fatty liver）. With contrast, 28 lesions were enhanced evenly or in the nodules in the arterial phase; 13 lesions still showed hyperdensity, 11 lesions isodensity and 4 lesions hypodensity in the parenchymatous phase; in the delayed phase only 5 lesions showed hyperdensity but 9 lesions showed isodensity or slight hypodensity and 14 lesions showed hypodensity. Twelve lesions of 28 had central asteroid scars. Thickened feeding arteries in postprocessing were seen in 24 lesions, and were integrated into the parenchymatous lesions with a gradual and smooth course. On the contrary, there were no artery penetrated into the lesion found in any of comparative hepatic tumors. CONCLUSION： Doctors could make a correct diagnosis and differentiation of FNH on evaluation of the characteristic appearance on MSCT with postprocessing,

关键词： Angiography Computer-assisted imageprocessing Focal nodular hyperplasia Liver diseases X-ray Computed tomography

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Classification of EEG-based single-trial motor imagery tasks using a B-CSP method for BCI

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Frontiers of Information Technology & Electronic Engineering 2019年第8期20卷 1087-1099页

作者： Zhi-chuan TANG Chao LI Jian-feng WU peng-cheng liu Shi-wei cheng Industrial Design Institute Zhejiang University of TechnologyHangzhou310014China College of Computer Science and Technology Zhejiang UniversityHangzhou310027China Lincoln Centre for Autonomous Systems University of LincolnLincoln LN57DHUK College of Computer Science&Technology Zhejiang University of TechnologyHangzhou310014China

Classifying single-trial electroencephalogram(EEG)based motor imagery(MI)tasks is extensively used to control brain-computer interface(BCI)applications,as a communication bridge between humans and ***,the low signal-to-noise ratio and individual differences of EEG can affect the classification results *** this paper,we propose an improved common spatial pattern(B-CSP)method to extract features for alleviating these adverse ***,for different subjects,the method of Bhattacharyya distance is used to select the optimal frequency band of each electrode including strong event-related desynchronization(ERD)and event-related synchronization(ERS)patterns;then the signals of the optimal frequency band are decomposed into spatial patterns,and the features that can describe the maximum differences of two classes of MI are extracted from the EEG *** proposed method is applied to the public data set and experimental data set to extract features which are input into a back propagation neural network(BPNN)classifier to classify single-trial MI *** two conventional feature extraction methods,original common spatial pattern(CSP)and autoregressive(AR),are used for *** improved classification performance for both data sets(public data set:91.25%±1.77%for left hand *** and84.50%±5.42%for left hand *** hand;experimental data set:90.43%±4.26%for left hand ***)verifies the advantages of the B-CSP method over conventional *** results demonstrate that our proposed B-CSP method can classify EEG-based MI tasks effectively,and this study provides practical and theoretical approaches to BCI applications.

关键词： Electroencephalogram(EEG) Motor imagery(MI) Improved common spatial pattern(B-CSP) Feature extraction Classification

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Multiferroic monolayers VOX(X = Cl, Br, I): Tunable ferromagnetism via charge doping and ferroelastic switching

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Chinese Physics B 2023年第6期32卷 602-607页

作者：杨洪超刘鹏程穆鎏羽李英德韩锴邱潇乐 School of Physics and Electronic Information Weifang UniversityWeifang 261061China

The fascinating properties arising from the interaction between different ferroic states of two-dimensional(2D) materials have inspired tremendous research interest in the past few *** the first-principles calculations,we predict the coexistence of antiferromagnetic and ferroelastic states in VOX(X=Cl,Br,I) *** results illustrate that the VOX monolayers exhibit indirect bandgap characteristics,i.e.,their gaps decrease with the halide elements changing from Cl to *** ground states of all these VOX monolayers are antiferromagnetic(AFM) with the magnetic moments contributed by the V 3d ***,the magnetic ground state changing from AFM to ferromagnetism(FM) can be realized by doping *** addition,the moderate ferroelastic transition barrier and reversible switching signal ensure their high performances of nonvolatile memory *** findings not only offer an ideal platform for investigating the multiferroic properties,but also provide candidate materials for potential applications in spintronics.

关键词： antiferromagnetic ferroelastic carrier doping multiferroic states

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颗粒形状对不良级配碎石集料剪切特性的影响

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岩土力学 2017年第8期38卷 2198-2202,2212页

作者：王鹏程刘建坤北京交通大学土木建筑工程学院北京100044 中国铁道科学研究院铁道建筑研究所北京100081

碎石颗粒的形状对于集料的整体剪切性能有很大的影响,而现有的研究缺乏对于不规则块体颗粒形状的定量评价指标。利用离散元软件PFC2D(Particle flow code,2D)研究,提出了不规则块体的生成方法,建立了平面双轴剪切试验条件,通过对比室内... 详细信息

碎石颗粒的形状对于集料的整体剪切性能有很大的影响,而现有的研究缺乏对于不规则块体颗粒形状的定量评价指标。利用离散元软件PFC2D(Particle flow code,2D)研究,提出了不规则块体的生成方法,建立了平面双轴剪切试验条件,通过对比室内试验结果完成了对模型的验证以及细观参数的选择。通过对块体进行分割后得到的多边形相邻顶角的差值进行分析,改进了棱角度指数的概念,在此基础上分析了颗粒形状对于级配不良的碎石集料的力学性质的影响,研究结果表明:棱角度指数受划分边界数的影响较大,随着划分密度的增加,棱角度指数不断减小并趋于稳定;随着轴向应变的增加,碎石集料的剪应力呈现出明显的非线性增加,曲线的形态受颗粒形状影响较大,除球形颗粒外,其他形状颗粒集料均呈现出应变硬化的特性。在棱角度指数较低时,抗剪强度和内摩擦角缓慢增加,而当棱角度较大时,抗剪强度指标则增加较快,可以通过幂函数进行拟合。

关键词：颗粒形状剪切特性棱角度指数离散元

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Application of antibody-conjugated small intestine submucosa to capture urine-derived stem cells for bladder repair in a rabbit model

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Bioactive Materials 2022年第8期7卷 443-455页

作者： Yu-Ting Song Yan-Qing Li Mao-Xuan Tian Jun-Gen Hu Xiu-Ru Zhang peng-cheng liu Xiu-Zhen Zhang Qing-Yi Zhang Li Zhou Long-Mei Zhao Jesse Li-Ling Hui-Qi Xie Laboratory of Stem Cell and Tissue Engineering Orthopedic Research InstituteMed-X Center for MaterialsState Key Laboratory of BiotherapyWest China HospitalSichuan UniversityChengduSichuan610041China Department of Aesthetic Surgery The People’s Hospital of PengzhouChengduSichuan611930China Surgery of Spine and Spinal Cord Henan Provincial People’s HospitalZhengzhouHenan450000China Department of Burn and Plastic Surgery West China HospitalSichuan UniversityChengduSichuan610041China Research Core Facility of West China Hospital Sichuan UniversityChengduSichuan610041China Department of Medical Genetics and Prenatal Diagnosis West China Second HospitalSichuan UniversityChengduSichuan610041China

The need for bladder reconstruction and side effects of cystoplasty have spawned the demand for the development of alternative material *** such as submucosa of small intestine(SIS)have been widely used as patches for bladder repair,but the outcomes are not fully *** capture stem cells in situ has been considered as a promising strategy to speed up the process of re-cellularization and *** this study,we have developed an anti-CD29 antibody-conjugated SIS scaffold(AC-SIS)which is capable of specifically capturing urine-derived stem cells(USCs)in situ for tissue repair and *** scaffold has exhibited effective capture capacity and sound *** vivo experiment proved that the AC-SIS scaffold could promote rapid endothelium healing and smooth muscle *** endogenous stem cell capturing scaffolds has thereby provided a new revenue for developing effective and safer bladder patches.

关键词： Regenerative medicine Bladder tissue engineering Scaffold Antibody-conjugated

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Modification strategies on nickel-based electrocatalysts for energyefficient anodic reactions

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Nano Research 2025年第1期18卷 50-75页

作者： Jingwen Yu Yunliang liu Naiyun liu Yaxi Li Yuanyuan cheng peng Cao Yixian liu Xinya Yuan Xinyue Zhang Haitao Li Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China

Electrocatalytic chemical oxidation(ECO)is an energy-efficient anodic reaction alternative to the oxygen evolution reaction(OER).ECO lowers the reaction potential and yields higher-value fine chemicals at the *** catalyst material plays a crucial role in influencing and determining ECO *** catalyst performance encompasses aspects such as activity,stability,selectivity and *** electrocatalysts have garnered significant attention for their exceptional performance and widespread use in ECO *** modifying nickel-based electrocatalysts,the formation of NiOOH active centers can be *** such as adjusting size and morphology,doping,introducing defects and constructing heterojunctions are advantageous for enhancing *** the rapid advancements in related research fields,it is imperative to comprehend the mechanisms of nickel-based electrocatalysts in ECO and develop innovative *** article provides an overview of the modification strategies of nickel-based electrocatalysts,as well as their applications and mechanisms in ECO.

关键词： anodic reactions electrocatalytic chemical oxidation nickel-based electrocatalysts NiOOH modification strategies

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