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In situ anodic leaching of Nd-Fe-B sludge with fast leaching kinetics for selective recovery of rare-earth elements

Journal of Rare Earths 2025年第03期 603-611页

作者： xuan xu Xiaozheng Jia Peng Jing Yuanyuan Zhang Jianguo Cui Kristina Zuzek Sturm Saso Baocang Liu Jun Zhang School of Chemistry and Chemical Engineering Inner Mongolia University Inner Mongolia Kertixingyun Science&Technology Incubation Base Co. Ltd. The Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare Earths Department for Nanostructured Materials Jozef Stefan Institute School of Chemistry and Environmental Science Inner Mongolia Normal University

Neodymium-iron-boron（Nd-Fe-B） sludge is an important secondary resource of rare-earth elements（REEs）.However,the state-of-the-art recycling method,i.e.,HCl-preferential dissolution faces challenges such as slow leaching kinetics,excessive chemical consumption and wastewater *** this work,the in situ anodic leaching of Nd-Fe-B sludge was developed to selectively recover REEs with high *** leaching rates of the REEs are 2.4-9.0 times higher using the in situ anodic leaching at the current density from 10 to 40 mA/cm2than using conventional chemical leaching under the maintained pH of *** studies reveal that the anode-generated H+plays the key role during the in situ anodic leaching process that locally increases the H+concentration at the interface of sludge particles,accele rating the leaching *** achieving a total leaching efficiency of Nd-Fe-B sludge close to 100%and the Fe deposition efficiency in the range of 70.9%-74.3%,selective leaching of REEs is successfully realized and thus largely reduces chemical ***,a two-step recycling route involving electrolysis-selective precipitation was proposed that enables a stable REEs recovery of 92.2%with recyclable *** study provides a novel and environmentally-friendly strategy for the efficient recovery of REEs from secondary resources.

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Trends of alkaline phosphatase to prealbumin ratio in patients with hepatitis B linked to hepatocellular carcinoma development

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World Journal of Gastroenterology 2025年第2期31卷 42-51页

作者： Wen-Chong Zhen Jing Sun xue-Ting Bai Qian Zhang Zi-Han Li Yi-Xin Zhang Rong-xuan xu Wei Wu Zhi-Han Yao Chun-Wen Pu Xiao-Feng Li School of Public Health Dalian Medical UniversityDalian 116044Liaoning ProvinceChina Graduate School Dalian Medical UniversityDalian 116044Liaoning ProvinceChina Dalian Public Health Clinical Center Dalian Municipal Research Institute for Public HealthDalian 116001Liaoning ProvinceChina Department of Epidemiology and Health Statistics Dalian Medical UniversityDalian 116044Liaoning ProvinceChina

BACKGROUND Chronic hepatitis B often progresses silently toward hepatocellular carcinoma(HCC),a leading cause of mortality *** detection of HCC is crucial,yet *** To investigate the role of dynamic changes in alkaline phosphatase to prealbumin ratio(APR)in hepatitis B progression to *** Data from 4843 patients with hepatitis B(January 2015 to January 2024)were *** incidence rates in males and females were compared using the log-rank *** were evaluated using Kaplan–Meier *** Linear Mixed-Effects Model was applied to track the fluctuation of APR levels over ***,Joint Modeling of Longitudinal and Survival data was employed to investigate the temporal relationship between APR and HCC *** The incidence of HCC was higher in *** ensure the model’s normality assumption,this study applied a logarithmic transformation to APR,yielding *** levels were higher in females(t=5.26,P<0.01).A 1-unit increase in ratio correlated with a 2.005-fold higher risk of HCC in males(95%CI:1.653-2.431)and a 2.273-fold higher risk in females(95%CI:1.620-3.190).CONCLUSION Males are more prone to HCC,while females have higher APR *** no baseline APR link,rising APR indicates a higher HCC risk.

关键词： Alkaline phosphatase to prealbumin ratio Chronic hepatitis B patients Hepatocellular carcinoma Retrospective cohort study Linear Mixed-Effect Mode Joint Modelling of Longitudinal and Survival data

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Theoretical Studies on the Fe-M Interactions and 31p NMR in Fe（CO）3（EtPhPpy）2MX2 （X=NCS, SCN, CI; M=Zn, Cd, Hg）

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Chinese Journal of Chemical Physics 2008年第5期21卷 438-444页

作者： Xiao-xuan Huang xuan xu Mei-xiang Xie School of Chemistry and Environment Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities South China Normal University Guangzhou 510006 China

To study the Fe-M interactions and their effects on 31p NMR, the structures of Fe（CO）3（EtPhPpy）2 1, Fe（CO）3（EtPhPpy）2M（NCS）2 （2： M=Zn, 3： M=Cd, 4： M=Hg） and Fe（CO）3（EtPhPpy）2CdX2 （5： X=C1, 6： X=SCN） were investigated by density functional theory （DFT） PBE0 method. The stabilities S of complexes follow S（2）〉S（3）〉S（4） and S（3）,.~S（6）〉S（5）, indicating that 6 is stable and may be synthesized. The complexes with thiocyanate are more stable than that with chloride in Fe（CO）3（EtPhPpy）2CdX2. The strength I of Fe-M interactions follows I（2）≈I（3）〈I（4）. The Fe-Cd interactions of 3 and 6, which contain thiocyanate, are stronger than that of 5 with chloride. The charge-transfer, which enhances with the increasing of Fe-M interaction strength, comes from Et, Ph, py, CO groups towards P, Fe, and M atoms. Because the delocalization of thiocyanate disperses the charge of M2＋, the charge-transfer of the complexes with thiocyanate is stronger than that with chloride. There is a a-bond between Fe and Hg atoms in 4. However, in binuclear complexes except 4, the Fe-M interactions act as nFe→nM, σP-Fe→nM and σC-Fe→nM delocalization, and the N-M interactions mainly act as nN→nM delocalization. In binuclear complexes, due to the Fe→M interactions, the strong σFe--C→σ＊Fe--p or σFe-Hg→σ＊Fe--I2 delocalization and the charge-transfer, the electron density on P nucleus is increased, and thus upfield 31p chemical shifts are caused （compared with mononuclear complex 1）.

关键词： DFT 31p NMR Metal-metal interaction Nature bond orbital

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基于多分支增强和融合注意力机制的水下图像增强算法

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陕西科技大学学报 2025年第1期43卷 193-202页

作者：姚斌韩典芝徐轩李婉陕西科技大学电子信息与人工智能学院陕西西安710021

由于水对光的折射和吸收,水下图像通常会出现严重的退化,如色偏、模糊、能见度低等.为了提高水下图像的可视性,提出了一种基于多分支增强和融合注意力机制的水下图像增强网络MBFA-GAN.首先,通过分析水下图像的色彩退化和模糊因素,设计... 详细信息

由于水对光的折射和吸收,水下图像通常会出现严重的退化,如色偏、模糊、能见度低等.为了提高水下图像的可视性,提出了一种基于多分支增强和融合注意力机制的水下图像增强网络MBFA-GAN.首先,通过分析水下图像的色彩退化和模糊因素,设计了青品色温修复模块和模糊恢复模块对水下图像进行色彩矫正和模糊恢复.然后,基于对多个分支特征的互补性考虑,采用循环合并策略将多个分支增强的特征利用自适应融合模块进行融合,逐步增强图像细节.最后,设计了融合注意力模块,用于深度挖掘图像在通道维度和像素维度的相关性矩阵,以提高增强图像的真实性.实验结果表明,与现有算法相比,提出的水下图像增强算法去模糊效果较好且颜色更真实,可以有效改善水下图像色偏和模糊的问题.

关键词：水下图像增强多分支增强融合注意力生成对抗网络

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胫骨前肌临床12种常用训练方式的激活比较

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中国康复医学杂志 2025年第1期40卷 67-72,100页

作者：徐璇刘光磊段文婷孟繁媛唐欣周娅昆明医科大学康复学院云南省昆明市650500 云南省第三强制隔离戒毒所

目的:通过量化和比较临床康复训练常用的12种训练方式在胫骨前肌激活的肌电信号振幅变化,以确定胫骨前肌激活最佳方式。方法:研究选取16名健康大学生作为目标人群,借助表面肌电图量化受试者在12项运动时胫骨前肌的活动水平,使用单因素... 详细信息

目的:通过量化和比较临床康复训练常用的12种训练方式在胫骨前肌激活的肌电信号振幅变化,以确定胫骨前肌激活最佳方式。方法:研究选取16名健康大学生作为目标人群,借助表面肌电图量化受试者在12项运动时胫骨前肌的活动水平,使用单因素方差分析和独立样本t检验对标准化处理后的表面肌电图的积分肌电值(integrated electromyography,iEMG)、均方根值(root mean square,RMS)进行分析。结果:在12种针对胫骨前肌激活的训练中,最大激活方式为T2“双脚站立(泡沫垫)踝关节从零度位开始背屈到最大角度”,其次分别为T1“双脚站立(地板),踝关节从零度位开始背屈到最大角度”和T5“双脚站立(泡沫垫)踝关节从零度位”做“足背屈+内翻”到最大角度;激活最小为T12“受试者以自然步伐在地面上行走”;其次为T6“受试者从30cm高台阶跳到地板上”和T7“受试者从30cm高台阶跳到泡沫垫上”。在RMS比较中,T12、T6、T7与T2激活情况存在显著性差异(P<0.05);T12、T6与T1激活情况存在显著性差异(P<0.05)。在iEMG比较中,T12、T6、T7与T2、T1和T5激活相比存在显著性差异(P<0.05),T12、T6与T3激活相比存在显著性差异(P<0.05),其他测试之间未发现明显显著性差异。此外,在男女生之间对12个测试激活情况进行比较,发现男性胫骨前肌激活程度整体大于女性,但未发现明显差异。结论:增加负重、降低支撑面稳定性、增加肌肉初长度和选择与患者能力匹配的难度训练方式可以增加胫骨前肌激活,而功能性活动和平衡策略使用在健康人群中对胫骨前肌激活并不如其他针对性测试。其中,在健康受试者中对胫骨前肌激活最大的训练方式是双脚站立踝关节从零度位开始背屈到最大角度。本研究结果为临床康复治疗与损伤预防处方的选择提供了有关胫骨前肌在特定运动中相对激活情况信息,可作为运动处方制定的参考。

关键词：胫骨前肌激活表面肌电图

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Synthesis and characterization of three new solid polyoxometalates based on Wells-Dawson-derived sandwich-type polyanions [Co_(4)(H_(2)O)_(2)(P_(2)W_(15)O_(56))_(2)]^(16-)

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第3期25卷 268-274页

作者： Jjijie YE xuan xu Chuande WU Department of Chemistry Zhejiang UniversityHangzhou 310058China

Three polyoxometalate-based hybrid coordination materials,[Co_(8)(H_(2)O)_(34)(pz)_(2){Co_(4)(H_(2)O)_(2)P_(4)W_(30)O_(112)}]·16H_(2)O(compound 1),[H_(3)O]_(4)[Co_(6)(H_(2)O)_(22)(pz)_(2){Co_(4)(H_(2)O)_(2)P_(4)W_(30)O_(112)}]·21H_(2)(compound 2),and[H_(3)O]_(4)[Co_(6)(H_(2)O)_(22){Co_(4)(H_(2)O)_(2)P_(4)W_(30)O_(112)}]·29H_(2)O(compound 3)(pz-pyrazine),were built from the linkage of[Co_(4)(H_(2)O)_(2)(P_(2)W_(15)O_(56)_(2)]^(16-)-(abbreviated as{Co_(4)P_(4)W_(30})polyanions and pz and/or cobalt(II)*** compounds 1 and 2 consisted of the same components,their lamellar networks were quite *** inorganic lamellar network in compound 3 was constructed by connecting{Co_(4)P_(4)W_(30)}units with cobalt(I)*** work demonstrates that the coordination modes of{Co_(4)P_(4)W_(30)}are very sensitive to synthesis conditions,while the ring-belt tetrametals are easily substituted by different transition metal cations under mild reaction conditions.

关键词： Cobalt Crystal structure Cyclic voltammetry Hybrid Polyoxometalate

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Designing electrolytes for lithium metal batteries with rational interface stability

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Rare Metals 2021年第2期40卷 243-245页

作者： Chen-xuan xu Jian-Jun Jiang School of Physics and Electronics Hunan UniversityChangsha410082China

Lithium(Li)-ion batteries(LIBs)have promoted the development of portable electronics and electric vehicles[1,2].However,with the rapid increase in energy demand,it is increasingly urgent to develop batteries with high energy density[3].Li metal batteries(LMBs)are considered as the"Holy Grail"which have attracted much attention due to the high theoretical capacity(3860 mAh·g^(-1))and low redox potential(-3.040 V *** standard hydrogen electrode)[4,5].

关键词： lithium rational interface

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Electrolytes speed up development of zinc batteries

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Rare Metals 2021年第4期40卷 749-751页

作者： Chen-xuan xu Jian-Jun Jiang School of Physics and Electronics Hunan UniversityChangsha 410082China

Zinc (Zn) batteries have attracted great attention since Zn anode is cost-effective and safe,and also exhibit high capacity and low *** effort has been made to achieve superior battery performance,i.e.,structural design of cathodes,optimizing electrolytes,and modification of Zn anode [1-3].Zn batteries can apply aqueous electrolytes and non-aqueous ***,both of them also suffer from some obstacles in the practical applications.

关键词： battery potential. Zinc

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Non-isothermal Crystallization Kinetics and Isothermal Crystallization Kinetics in Supercooled Liquid Region of Cu–Zr–Al–Y Bulk Metallic Glass

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Acta Metallurgica Sinica(English Letters) 2018年第3期31卷 290-298页

作者： Ke Yang Xin-Hui Fan Bing Li Yan-Hong Li Xin Wang xuan-xuan xu School of Material and Chemical Engineering Xi'an Technological University

The crystallization kinetics of Cu43Zr48Al9 and（Cu43Zr48Al9）98Y2 bulk metallic glasses in non-isothermal and isothermal conditions was studied by differential scanning *** the non-isothermal and isothermal modes,the average activation energy of（Cu43Zra8Al9）98Y2 is larger than that of Cu43Zr48Al9,meaning the higher stability against crystallization of（Cu43Zr48Al9）*** addition,the average activation energies for Cu43Zr48Al9 and（Cu43Zr48Al9）98Y2 calculated using Arrhenius equation in isothermal mode are larger than the values calculated by Kissinger-Akahira-Sunose method in non-isothermal mode,indicating that the energy barrier is higher in isothermal *** Johnson-Mehl-Avrami model was used to analyze the crystallization kinetics in the non-isothermal and isothermal *** Avrami exponent n for Cu43Zr48Al9 is above 2.5,indicating that the crystallization is mainly determined by a diffusion-controlled three-dimensional growth with an increasing nucleation rate,while the Avrami exponent n for（Cu43Zr48Al9）98Y2 is in the range of 1.5-2.5 in the non-isothermal mode,implying that the crystallization is mainly governed by diffusion-controlled three-dimensional growth with decreasing nucleation ***,the Avrami exponents n for Cu43Zr48Al9 and（Cu43Zr48Al9）98Y2 are different in the non-isothermal and isothermal conditions,which imply different nucleation and growth behaviors during the crystallization processes.

关键词： Bulk metallic glass Yttrium addition Crystallization behavior Activation energy

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Combination of heterogeneous Fenton-like reaction and photocatalysis using Co–TiO_2 nanocatalyst for activation of KHSO_5 with visible light irradiation at ambient conditions

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Journal of Environmental Sciences 2014年第12期26卷 2440-2450页

作者： Qingkong Chen Fangying Ji Qian Guo Jianping Fan xuan xu School of River and Ocean Engineering Chongqing Jiaotong University Key Laboratory of Three Gorges Reservoir Region's Eco-Environment Ministry of Education Chongqing University National Centre for International Research of Low-carbon and Green Buildings Chongqing University T.Y.Lin International Engineering Consulting (China) Co. Ltd

A novel coupled system using Co–Ti O2 was successfully designed which combined two different heterogeneous advanced oxidation processes, sulfate radical based Fenton-like reaction（SR-Fenton） and visible light photocatalysis（Vis-Photo）, for degradation of organic contaminants. The synergistic effect of SR-Fenton and Vis-Photo was observed through comparative tests of 50 mg/L Rhodamine B（Rh B） degradation and TOC removal. The Rhodamine B degradation rate and TOC removal were 100% and 68.1% using the SR-Fenton/Vis-Photo combined process under ambient conditions, respectively. Moreover, based on XRD, XPS and UV-DRS characterization, it can be deduced that tricobalt tetroxide located on the surface of the catalyst is the SR-Fenton active site, and cobalt ion implanted in the Ti O2 lattice is the reason for the visible light photocatalytic activity of Co–Ti O2. Finally, the effects of the calcination temperature and cobalt concentration on the synergistic performance were also investigated and a possible mechanism for the synergistic system was proposed. This coupled system exhibited excellent catalytic stability and reusability,and almost no dissolution of Co2＋was found.

关键词： Fenton-like Photocatalysis Cobalt Sulfate radical Visible light

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