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Assessment of internal quality of billets using ultrasonic three-dimensional layered characterization

Journal of Iron and Steel Research International 2024年第11期31卷 2727-2739页

作者： Yan-bo Liu Min Li Zheng Zhao Zhong-xin Wang de-bin yang School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China

To address the challenge of visualizing internal defects within castings, ultrasonic nondestructive testing technology has been introduced for the detection and characterization of internal defects in castings. Ultrasonic testing is widely utilized for detecting and characterizing internal defects in materials, thanks to its strong penetration ability, wide testing area, and fast scanning speed. However, traditional ultrasonic testing primarily relies on one-dimensional waveforms or two-dimensional images to analyze internal defects in billets, which hinders intuitive characterization of defect quantity, size, spatial distribution, and other relevant information. Consequently, a three-dimensional (3D) layered characterization method of billets internal quality based on scanning acoustic microscope (SAM) is proposed. The method starts with a layered focus scanning of the billet using SAM and pre-processing the obtained sequence of ultrasonic images. Next, the ray casting is employed to reconstruct 3D shape of defects in billets, allowing for characterization of their quality by obtaining characteristic information on defect spatial distributions, quantity, and sizes. To validate the effectiveness of the proposed method, specimens of 42CrMo billets are prepared using five different processes, and the method is employed to evaluate their internal quality. Finally, a comparison between the ultrasonic image and the metallographic image reveals a difference in dimensional accuracy of only 2.94%. The results indicate that the new method enables visualization of internal defect information in billets, serving as a valuable complement to the traditional method of characterizing their internal quality.

关键词： Internal quality of billets Ultrasonic testing Scanning acoustic microscope Layered characterization Three-dimensional reconstruction

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Value of superb micro-vascular imaging in predicting ischemic stroke in patients with carotid atherosclerotic plaques

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World Journal of Clinical Cases 2019年第7期7卷 839-848页

作者： de-bin yang Jie Zhou Lan Feng Rong Xu Ying-Chun Wang department of Ultrasonic Imaging Jiading District Central Hospital Affiliated Shanghai University of Medicine & Health Sciences

BACKGROUND Unstable carotid atherosclerotic plaques are prone to cause ischemic ***-enhanced ultrasound(CEUS) is the primary method of assessing plaque stability, but CEUS cannot be a method for screening for unstable plaque. The emergence of superb micro-vascular imaging(SMI) offers the possibility of clinically screening for unstable plaque AIM To investigate the value of SMI in predicting ischemic stroke in patients with carotid atherosclerotic *** Patients with carotid atherosclerotic plaques(luminal stenosis of 50%-70%) were enrolled into the present study. All patients received conservative *** patient's clinical baseline data, serological data, CEUS and SMI data were analyzed. All patients underwent a 3-year follow-up. The follow-up endpoint was the occurrence of ischemic stroke and patients were divided into stroke group and non-stroke group according to whether the prognosis occurred or ***, the difference in clinical data was compared, the correlation of SMI and CEUS was analyzed, and multiple Cox regression and receiver operating characteristic curve were applied to investigate the value of SMI and CEUS in predicting cerebral arterial thrombosis in three *** In this study, 43 patients were enrolled in the stroke group and 82 patients were enrolled in the non-stroke group. Cox regression revealed that SMI level(P =0.013) and enhancement intensity(P = 0.032) were the independent factors influencing ischemic stroke. There was a positive correlation between SMI level and enhancement intensity(r = 0.737, P = 0.000). The area under curve of SMI level predicting ischemic stroke was 0.878. The best diagnostic point was ≥ level Ⅱ, and its sensitivity and specificity was 86.05% and 79.27%. The area under curve of enhancement intensity predicting ischemic stroke was 0.890. The best diagnostic point was 9.92 db, and its sensitivity and specificity was 88.37% and89.02%. As the SMI level gradually increased, the

关键词： Superb micro-vascular imaging Contrast-enhanced ultrasound Carotid atherosclerotic plaques Ischemic stroke

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Role of shear wave elastography in the evaluation of the treatment and prognosis of supraspinatus tendinitis

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World Journal of Clinical Cases 2020年第14期8卷 2977-2987页

作者： Jie Zhou de-bin yang Jing Wang Hui-Zhang Li Ying-Chun Wang department of Ultrasonic Imaging Jiading District Central Hospital Affiliated Shanghai University of Medicine and Health SciencesShanghai 201800China department of Orthopaedics Jiading District Central Hospital Affiliated Shanghai University of Medicine and Health SciencesShanghai 201800China

BACKGROUND Supraspinatus tendinitis recurs easily after *** of the main reasons is the lack of objective tools for the efficacy *** wave elastography(SWE)can quantitatively analyze the tissue elasticity of region of interest by measuring the Young’s modulus(YM)*** To explore the role of SWE in the efficacy and prognostic evaluation of supraspinatus *** Eighty-seven patients with supraspinatus tendinitis treated in Jiading District Central Hospital Affiliated Shanghai University of Medicine and Health Sciences were *** 30 healthy volunteers were enrolled as the control *** visual analogue scale(VAS)and Constant-Murley Score(CMS)were recorded before *** participants were scanned by SWE scan,and the YM value of the region of interest were *** correlation analysis was performed on YM values with VAS and *** repeated measures analysis of variance was used to calculate the changing trend of VAS,CMS and SWE under different treatment *** treatment,the patients were further grouped based on who achieved significantly effective and curative *** patients in the continued treatment group continued to receive treatment according to the YM value,and the remaining patients who stopped receiving treatment were included in the stopped treatment *** patients were followed up for 1 year,and the difference in recurrence rates between the continued treatment group and the stopped treatment group were *** The SWE images of supraspinatus muscle in healthy volunteers were mainly blue,while those of patients with supraspinatus tendinitis showed regional red and green *** average YM value of the supraspinatus muscle in healthy volunteers was 26.12±4.03 *** average YM value of patients with supraspinatus muscle was greater than that of healthy volunteers(average YM=60.61±11.53 kPa,t=26.344,P<0.001).The YM value was positively correlated with VAS(r

关键词： Supraspinatus tendinitis Shear wave elastography Young’s modulus value Visual analog score Constant-Murley score Recurrence

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Crust–mantle interaction recorded by Early Cretaceous volcanic rocks within the southern margin of the North China Craton

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Geoscience Frontiers 2022年第6期13卷 75-90页

作者： An-Qi Wang de-bin yang Hao-Tian yang Mao-Song Mu Yi-Kang Quan Xiang-Yu Yan Le-Ran Hao Wen-Liang Xu College of Earth Sciences Jilin UniversityChangchun 130061China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Natural ResourcesChangchun 130061China

This study presents new geochronological and geochemical data for Early Cretaceous volcanic rocks in the southern margin of the North China Craton(NCC),to discuss the crust–mantle *** studied rocks include pyroxene andesites from Daying Formation,hornblende andesites and andesites from Jiudian Formation,and rhyolites from a hitherto unnamed *** rocks formed in Early Cretaceous(138–120 Ma),with enrichment in light rare earth elements(REE),depletion in heavy REE and arc-like trace elements *** andesites show low SiO_(2) contents and enriched Sr–Nd–Pb–Hf isotopic compositions,with orthopyroxene phenocryst and Paleoproterozoic(2320–1829 Ma)inherited zircons,suggesting that they originated from lithospheric mantle after metasomatism with NCC lower crustal *** andesites have low SiO_(2) contents and high Mg#(Mg#=100 Mg/(Mg+Fe^(2+)))values,indicating a lithospheric-mantle *** the distinct wholerock Sr isotopic compositions we divide them into two *** them,the low(^(87)Sr/^(86)Sr)iandesites possess amount inherited Neoarchean to Neoproterozoic(2548–845 Ma)zircons,indicating the origin of lithospheric mantle with addition of yangtze Craton(YC)and NCC *** comparison,the high(^(87)Sr/^(86)Sr)iandesites,with abundant Neoarchean–Paleozoic inherited zircons(3499–261 Ma),are formed by partial melting of lithospheric mantle with incorporation of NCC supracrustal rocks and YC *** have extremely high SiO_(2)(77.63–82.52 wt.%)and low total Fe_(2)O_(3),Cr,Ni contents and Mg#values,combined with ancient inherited zircon ages(2316 and 2251 Ma),suggesting an origin of NCC lower continental *** the presence of resorption texture of quartz phenocryst,we propose a petrogenetic model of’crystal mushes’for rhyolites prior to their *** constraints record the intense crust–mantle interaction in the southern margin of the *** the regional data and spatial d

关键词： Early Cretaceous Volcanic rocks Sr–Nd–Pb–Hf isotopes Crust–mantle interaction North China Craton

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Comparative Analysis on Genomes from Oryza alta and Oryza latifolia by C_0t-1 DNA

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Rice science 2010年第3期17卷 185-191页

作者： WANG de-bin WANG yang Wu Qi ZHAO Hou-ming LI Gang QIN Rui WANG Chun-tai LIu Hong Engineering Research Centre for the Protection and Utilization of Bioresource in Ethnic Area of Southern China South-CentralUniversityfor Nationalities Wuhan 430074 China

In order to reveal the origin and evolutionary relationship between two CCDD genome species, Oryza alta and Oryza latifolia, fluorescence in situ hybridization （FISH） was adopted to analyze the genomes of the two species with C0t-1 DNA from O. alta as a probe. Karyotype was also comparatively analyzed between O. alta and O. latifolia based on their similar band patterns of the hybridization signals. There were a high homology and close relationship between O. alta and O. latifolia, however, the distinction between the hybridization signals was also clear. C0t-1 DNA was proved to be species- and genome type-specific. It is suggested that C0t-1 DNA-FISH could be more efficient to analyze the genomic relationship between different species. According to the comparative analysis of highly and moderately repetitive DNA sequences between the two allotetraploidy species, O. alta and O. latifolia, the possible origin and evolutionary mechanism of allotetraploidy of Oryza were discussed.

关键词： Oryza alta Oryza latifolia fluorescence in situ hybridization chromosomal repeat sequence karyotype phylogenetic relation

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Metal nanoparticles decorated CoFe-(oxy)hydroxysulfides nanosheets fabricated by a general strategy for electrocatalytic water splitting

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Journal of Energy Chemistry 2025年第1期100卷 26-38页

作者： Xiaodong yang Haochen Shen Xiaoming Xiao Zhichao Li Qi Zhou Wei yang bin Jiang Yongli Sun Luhong Zhang Zhenhua Yan School of Chemical Engineering and Technology Tianjin University Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University

This study presents a novel method to fabricate metal-decorated,sulfur-doped layered double hydroxides （M/SLDH） through spontaneous redox and sulfurization *** developed Ag/SLDH and Pt/SLDH catalysts with abundant heterogeneous interfaces and hierarchical nanostructures demonstrated outstanding oxygen evolution reaction （OER） and hydrogen evolution reaction （HER） performance,achieving low overpotentials of 212 and 35 mV at 10 mA cm-2in 1 M KOH,*** both anode and cathode in water splitting,they required only 1.47 V to reach 10 mA cm-2and exhibited high structural robustness,maintaining stability at 1000 mA cm-2for 300 ***-situ Raman analysis revealed that the synergistic effects of metal nanoparticles and S doping significantly promote the transformation into the S-Co1-xFexOOH layer,which serves as the active phase for water ***,ultraviolet photoelectron spectroscopy （UPS） and density functional theory （DFT） analyses indicated that incorporating metal nanoparticles and S doping increase electron density near the Fermi level and reduce reaction energy barriers,thus enhancing intrinsic OER and HER *** study provides a scalable strategy for synthesizing high-performance electrocatalysts for water splitting,with promising potential for broader applications.

关键词： LDH Spontaneous reaction Metal nanoparticles Water splitting

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A cellulose-based lithium-ion battery separator with regulated ionic transport and high thermal stability for extreme environments

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Nano Research 2025年第1期18卷 315-322页

作者： Kun-Peng yang Song Xie Zi-Meng Han Hao-Cheng Liu Chong-Han Yin Wen-bin Sun Zhang-Chi Ling Huai-bin yang de-Han Li Qing-Fang Guan Shu-Hong Yu department of Chemistry New Cornerstone Science LaboratoryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Institute of Innovative Materials Department of Materials Science and EngineeringDepartment of ChemistrySouthern University of Science and TechnologyShenzhen 518055China

Separators play a critical role in lithium-ion ***,the restrictions of thermal stability and inferior electrical performance in commercial polyolefin separators significantly limit their applications under harsh ***,we report a cellulose-assisted self-assembly strategy to construct a cellulose-based separator massively and *** an ultrahigh ionic conductivity in electrolytes of 3.7 mS·cm^(-1) and the ability to regulate ion transport,the obtained separator is a promising alternative for high-performance lithium-ion *** addition,integrated with high thermal stability,the cellulose-based separator endows batteries with high safety at high temperatures,greatly expanding the application scenarios of energy storage devices in extreme environments.

关键词： lithium-ion batteries bio-inspired materials battery separators cellulose nanofiber ultrahigh ionic conductivity high safety

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山区农村居民点空间分布特征与空间重构研究

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长江流域资源与环境 2017年第2期26卷 238-246页

作者：卢德彬杨建毛婉柳禹真王祖静白彬铜仁学院旅游与地理系贵州铜仁554300 华东师范大学地理科学学院上海200241

梵净山地区地属喀斯特山区,其核心区为国家级自然保护区,村庄规划布局的制约因素较多。为实现农村居民点的空间优化,综合评价了农村居民点的空间位置、自然资源和区位条件对农村居民点分布的影响,利用主成分分析法综合各影响指标,求出... 详细信息

梵净山地区地属喀斯特山区,其核心区为国家级自然保护区,村庄规划布局的制约因素较多。为实现农村居民点的空间优化,综合评价了农村居民点的空间位置、自然资源和区位条件对农村居民点分布的影响,利用主成分分析法综合各影响指标,求出农村居民点规模值,在此基础上通过基于断裂点的加权Voronoi图分割其作用范围,结合"居住场势"分类,找出需要搬迁的农村居民点。结果表明:1研究区共有农村居民点23 046个,面积14 342.78 hm^2,居民点多沿道路支线和河流分布于山间河谷地带,布局散乱。2区域内有零星居民点7 871个,面积为2 641.75 hm^2,占18.42%;需保留居民点10 288个,面积为5 680.46 hm^2,占39.6%;中心居民点4 887个,面积为6 020.57 hm^2,占41.98%。3空间布局优化后的农村居民点共15 175个,总面积不变,主要应将西部和梵净山保护区内的零散聚落向东部水源充沛、交通发达的集镇地区搬迁。研究成果可为梵净山地区新农村规划的科学编制提供理论参考。

关键词：农村居民点主成分分析加权Voronoi图空间重构

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压气机转子的表面造型及等温精密成形工艺

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推进技术 2003年第5期24卷 474-477页

作者：刘芳单德彬吕炎杨玉英哈尔滨工业大学材料科学与工程学院黑龙江哈尔滨150001

采用NURBS方法生成了转子叶片的表面模型,并对其进行了延伸和裁剪,将叶片模型和转子的二次表面模型组合,得到转子锻件和模具镶块的表面模型。以此为基础设计了一套组合式模具,模具的凹模由23块镶块组合而成。最后采用等温锻造的方法成... 详细信息

采用NURBS方法生成了转子叶片的表面模型,并对其进行了延伸和裁剪,将叶片模型和转子的二次表面模型组合,得到转子锻件和模具镶块的表面模型。以此为基础设计了一套组合式模具,模具的凹模由23块镶块组合而成。最后采用等温锻造的方法成形转子锻件,模具和坯料的加热温度均为430℃。经检测,转子锻件的尺寸精度及组织性能均符合设计要求。

关键词：压气机转子表面造型 NURBS方法等温成形方案设计

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Effect of Nb-V microalloying on the hot deformation behavior of medium Mn steels

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 360-368页

作者： Yumeng Wang Qinyi Guo bin Hu Haiwen Luo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The influence of Nb-V microalloying on the hot deformation behavior and microstructures of medium Mn steel(MMS)was investigated by uniaxial hot compression *** establishing the constitutive equations for simulating the measured flow curves,we successfully constructed deformation activation energy(Q)maps and processing maps for identifying the region of flow *** concluded the following consequences of Nb-V alloying for MMS.(i)The critical strain increases and the increment diminishes with the increasing deformation temperature,suggesting that NbC precipitates more efficiently retard dynamic recrystallization(DRX)in MMS compared with solute Nb.(ii)The deformation activation energy of MMS is significantly increased and even higher than that of some reported high Mn steels,suggesting that its ability to retard DRX is greater than that of the high Mn content.(iii)The hot workability of MMS is improved by narrowing the hot processing window for the unstable flow stress,in which fine recrystallized and coarse unrecrystallized grains are present.

关键词： medium manganese steel niobium-vanadium microalloying flow behavior dynamic recrystallization hot workability

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