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As和MgO的加入对铜冶炼渣中砷玻璃化的影响

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Transactions of Nonferrous Metals Society of China 2024年第6期34卷 2020-2033页

作者：金哲男王保仁杨洪英赵前飞符岩东北大学多金属矿生态冶金教育部重点实验室沈阳110819 东北大学冶金学院沈阳110819

研究FeO−SiO_(2)−Fe_(2)O_(3)−B_(2)O_(3)−CaO−Al_(2)O_(3)−(MgO)体系铜冶炼渣中砷(As)的玻璃化。通过XRD、SEM、FTIR和XPS分析手段系统地研究As玻璃化机制。结果表明,As与铁硅酸盐炉渣表现出良好的相容性。FTIR和XPS分析结果表明,As可以部分替代硅形成Si—O—As结构,从而提高熔体的聚合度。[BO_(3)]^(3−)结构单元随着As含量的增加而趋于减少,而加入MgO后则观察到相反的行为。此外,MgO增加了熔体的非桥氧数量(NBO)。TCLP、SPLP和pH依赖性测试结果表明,As的浸出毒性随着As含量的增加而增加,但随着MgO的加入而降低。DSC分析结果表明,As和MgO的加入均可以改善含As玻璃的热稳定性。

关键词：玻璃化砷氧化镁铜冶炼渣炉渣结构

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仿生天然高分子水凝胶在医用材料方面的应用

高分子通报 2024年第2期37卷 162-173页

作者：刘志华林依洋陈爽韩顺玉姜男哲延边大学工学院延吉133002

天然高分子水凝胶具有高度水合的三维网络结构,显示出独特的粘附性,能有效地控制出血,减少二次感染,且生物相容性和生物降解性好,是一种理想的医用粘合剂材料。近年来,鉴于目前医用粘合剂研发制备中对水下湿粘性以及生物降解性能等要求... 详细信息

天然高分子水凝胶具有高度水合的三维网络结构,显示出独特的粘附性,能有效地控制出血,减少二次感染,且生物相容性和生物降解性好,是一种理想的医用粘合剂材料。近年来,鉴于目前医用粘合剂研发制备中对水下湿粘性以及生物降解性能等要求越来越严格,具有耐水粘附性、生物安全性和形状可控性的新型粘附材料成为研究的热点和难点。自然界生物对各种基质的粘附性主要取决于其组成或结构,利用天然高分子水凝胶材料进行仿生,可以使其兼具优异的组织粘附性、止血抑菌性和形状可控性等特性,是解决上述问题的有效策略。本文概述了两种类型的仿生天然高分子水凝胶材料粘附机制,针对性地讨论了贻贝、藤壶、牡蛎的组成特性和咸水鱼、细胞外基质(extracellular matrix)的结构特点以及粘附机理,并介绍了相应仿生天然高分子水凝胶材料在组织愈合、伤口止血及药物递送方面的研究进展。最后,对仿生天然高分子水凝胶在未来的发展方向进行展望并为其提供相应的建议。

关键词：医用粘合剂仿生设计水凝胶天然聚合物

Numerical simulation of broken pin effects on the flow field and cooling performance of a double-wall cooling configuration

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Chinese Journal of Aeronautics 2021年第2期34卷 358-375页

作者： Wenjing GAO Honglin LI Lei LI zhe’nan ZHAO Zhufeng YUE Department of Engineering Mechanics Northwestern Poly technical UniversityXian 710129China

In this paper, the flow characteristics of the double wall structure are presented and the effect of the broken pin size on the cooling performance and flow field of the double wall configuration is investigated. A periodic plate model with seven units is adopted, and there are an impingement hole and a film hole in each unit. Under five blowing ratios, six different sizes of the broken pin are compared, and the double wall configuration without broken pins is taken as the *** results show that if the broken pins height is too small, the cooling effectiveness usually cannot be improved. With the presence of broken pins with a height of more than 0.4, the effectiveness is improved due to the enhancement of reattachment and recirculation of coolant. With the increase of the broken pin height, the cooling effectiveness increases. However, the increase of the diameter does not always improve the cooling performance, since the limiting effect of the wall jet. In this study, Case 6 with the largest broken pin always has the best cooling performance, but also the largest flow resistance. In Case 6 temperature is reduced by almost 15 K compared to the baseline, and more areas have relatively higher cooling effectiveness.

关键词： Broken pin Computational Fluid Dynamics Cooling performance Double wall configuration Turbine blades

Corrosion mechanism of magnesia-chromite refractories by ZnO-containing fayalite slags: Effect of funnel glass addition

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International Journal of Minerals,Metallurgy and Materials 2019年第12期26卷 1604-1616页

作者： zhe-nan Jin Jian-fang Lv Hong-ying Yang Zhi-yuan Ma Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China Guangdong Institute of Resource Comprehensive Utilization Guangdong Academy of SciencesGuangzhou 510650China State Key Laboratory of Separation and Comprehensive Utilization of Rare Metals Guangzhou 510650China Guangdong Provincial Key Laboratory of Development and Comprehensive Utilization of Mineral Resources Guangzhou 510650China

An efficient approach for lead extraction from waste funnel glass through the lead smelting process has been proposed. To clarify the effect of funnel glass addition on the degradation of magnesia-chromite refractories by ZnO-containing fayalite slag, the corrosion behavior of magnesia-chromite refractories in lead smelting slags with different funnel glass additions from 0wt% to 40wt% was tested. Scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) was used to acquire the microstructural information of the worn refractory samples. Experimental results showed that the corrosion of magnesia-chromite refractory consisted predominantly of the dissolution of MgO into slag. ZnO and FeO reacted with periclase and chromite to form (Zn,Fe,Mg)O solid solution and (Zn,Fe,Mg)(Fe,Al,Cr)2O4 spinel, respectively. With the addition of funnel glass, the solubility of MgO increased whereas ZnO levels remained stable, thereby resulting in a reduced Mg content and an elevated Zn and Fe content in the (Zn,Fe,Mg)O solid solution and the (Zn,Fe,Mg)(Fe,Al,Cr)2O4 spinel. Considering the stability of the (Zn,Fe,Mg)O solid solution layer and the penetration depth of the slag, the optimal funnel glass addition for lead smelting was found to be 20wt%.

关键词： funnel glass zinc-containing fayalite slag magnesia-chromite refractory corrosion

Amino acid metabolism in health and disease

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Signal Transduction and Targeted Therapy 2023年第10期8卷 4597-4628页

作者： zhe-nan Ling Yi-Fan Jiang Jun-nan Ru Jia-Hua Lu Bo Ding Jian Wu Division of Hepatobiliary and Pancreatic Surgery Department of SurgeryThe First Affliated HospitalZhejiang University School of Medicine79 Qingchun RoadHangzhouZhejang Province 310o03P.R.China NHC Key Laboratory of Combined Multi-organ Transplantation HangzhouZhejiang ProvincePR.China Key Laboratory of the Diagnosis and Treatment of Organ Transplantation Research Unit of Collaborative Diagnosis and Treatment For Hepatobiliary and Pancreatic CancerChinese Academy of Medical Sciences(2019RU019)HangzhouZhejiang ProvinceP.R.China Key Laboratory of Organ Transplantation Research Center for Diagnosis and Treatment of Hepatobiliary DiseasesHangzhouZhejiang ProvinceP.R.China

Amino acids are the building blocks of protein *** are structural elements and energy sources of cells necessary for normal cell growth,differentiation and *** acid metabolism disorders have been linked with a number of pathological conditions,including metabolic diseases,cardiovascular diseases,immune diseases,and *** the case of tumors,alterations in amino acid metabolism can be used not only as clinical indicators of cancer progression but also as therapeutic strategies.

关键词： synthesis. function. metabolism

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支撑失效对变压器绕组短路动力学特性的影响

变压器 2024年第7期61卷 22-28页

作者：张海军王鑫宫瑞磊龙荣简哲楠纯电动汽车动力系统设计与测试湖北省重点实验室湖北文理学院湖北襄阳441053 山东泰开高压开关有限公司山东泰安271000

本文中作者以110kV电力变压器为例,结合理论分析和有限元方法对考虑局部支撑失效影响的变压器绕组短路动力学特性进行了数值仿真研究,建立了短路条件下的变压器绕组电磁-结构耦合动力学分析模型,并利用三维有限元方法计算了短路电流作... 详细信息

本文中作者以110kV电力变压器为例,结合理论分析和有限元方法对考虑局部支撑失效影响的变压器绕组短路动力学特性进行了数值仿真研究,建立了短路条件下的变压器绕组电磁-结构耦合动力学分析模型,并利用三维有限元方法计算了短路电流作用下漏磁场与电磁力分布。对不同垫块、撑条支撑失效情况进行了模拟,比较分析了局部支撑失效对绕组幅向和轴向振动位移特性。结果表明:支撑失效后的绕组局部线饼位移都出现了剧烈显著变化,相比正常绕组的最大振动位移增加168%,将为研究真实工况下的电力变压器绕组变形以及短路动力学关联特征提供重要参考。

关键词：变压器绕组支撑失效磁-固耦合短路计算

Effect of the CaO/SiO2 mass ratio and FeO content on the viscosity of CaO–SiO2–“FeO”–12wt%ZnO–3wt%Al2O3 slags

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International Journal of Minerals,Metallurgy and Materials 2017年第7期24卷 756-767页

作者： Jian-fang Lü zhe-nan Jin Hong-ying Yang Lin-lin Tong Guo-bao Chen Fa-xin Xiao School of Metallurgy Northeastern University Shenyang 110819 China

An effective process for recycling lead from hazardous waste cathode ray tubes（CRTs） funnel glass through traditional lead smelting has been presented previously. The viscous behavior of the molten high lead slag, which is affected by the addition of funnel glass, plays a critical role in determining the production efficiency. Therefore, the viscosities of the CaO–SiO_2–＂FeO＂–12wt%ZnO–3wt%Al_2O_3 slags were measured in the current study using the rotating spindle method. The slag viscosity decreases as the CaO/SiO_2 mass ratio is increased from 0.8 to 1.2 and also as the FeO content is increased from 8wt% to 20wt%. The breaking temperature of the slag is lowered substantially by the addition of FeO, whereas the influence of the CaO/SiO_2 mass ratio on the breaking temperature is complex. The structural analysis of quenched slags using Fourier transform infrared（FTIR） spectroscopy and Raman spectroscopy reveals that the silicate network structure is depolymerized with increasing CaO/SiO_2 mass ratio or increasing FeO content. The [FeO_6]-octahedra in the slag melt increase as the CaO/SiO_2 mass ratio or the FeO content increases. This increase can further decrease the degree of polymerization（DOP） of the slag. Furthermore, the activation energy for viscous flow decreases both with increasing CaO/SiO_2 mass ratio and increasing FeO content.

关键词： lead smelting slag viscosity basicity ferrous oxide slag structure

Surgical therapy for hemangioma of the azygos vein arch under thoracoscopy: A case report

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World Journal of Clinical Cases 2021年第11期9卷 2655-2661页

作者： zhen-Xing Wang Liang-Liang Yang zhe-nan Xu Pei-Yun Lv Yue Wang Department of Thoracic Surgery China-Japan Union Hospital of Jilin UniversityChangchun 130033Jilin ProvinceChina

BACKGROUND Azygos vein aneurysms are extremely rare,and their pathogenesis is not *** overwhelming majority of patients have no obvious clinical symptoms and are found to have the disease by physical examination or by *** are few reports on the diagnosis of and treatment strategy for this ***,the choice of therapeutic schedule and the treatment window are *** SUMMARY We report a case of azygos vein arch aneurysm in a 53-year-old *** patient had symptoms of back pain,chest tightness,and *** chest computed tomography showed a soft-tissue mass in the right posterior mediastinum,which was connected to the superior vena *** enhancement degree in the venous phase was the same as that of the superior vena *** patient received video-assisted thoracoscopic *** the operation,her back pain disappeared,and her dysphagia and chest tightness were also significantly *** postoperative pathology confirmed *** patient was discharged on the seventh day after surgery without any *** Some patients with hemangioma of the azygos vein arch may experience dysphagia and chest tightness caused by the tumor compressing the esophagus and *** computed tomography scanning is vital for the diagnosis of azygos vein *** addition,despite the difficulty and risk of surgery,thoracoscopic surgery for azygos vein aneurysms is completely feasible.

关键词： Azygos vein aneurysm Hemangioma of the azygos vein arch Mediastinal tumor Thoracoscopic surgery Case report

Unveiling the mechanisms of Fe(Ⅲ)-loaded chitosan composite(CTS-Fe)in enhancing anaerobic digestion of waste activated sludge

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Journal of Environmental Sciences 2024年第4期138卷 200-211页

作者： Boaiqi Zhang Ziwen Zhao RuiMa nan Chen zhe Kong Zhongfang Lei zhenya Zhang Graduate School of Life and Environmental Sciences University of Tsukuba1-1-1 TennodaiTsukubaIbaraki 305-8572Japan The Key Laboratory of Water and Sediment Sciences Ministry of Education/State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems/College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China South China Institute of Environmental Sciences Ministry of Ecology and EnvironmentGuangzhou 510345China School of Water Resources and Environment China University of Geosciences(Beijing)Beijing 100083China School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China

Anaerobic digestion(AD)of waste activated sludge(WAS)is usually limited by the low generation efficiency of ***(Ⅲ)-loaded chitosan composite(CTS-Fe)have been reported to effectively enhanced the digestion of WAS,but its role in promoting anaerobic sludge digestion remains *** present study,the effects of CTS-Fe on the hydrolysis and methanogenesis stages of WAS anaerobic digestion were *** addition of CTSFe increased methane production potential by 8%-23%under the tested conditions with the addition of 5-20 g/L ***,the results demonstrate that the addition of CTS-Fe could effectively promote the hydrolysis of WAS,evidenced by lower protein or polysaccharides concentration,higher soluble organic carbon in rector adding CTS-Fe,as well as the increased activity of extracellular hydrolase with higher CTS-Fe ***,the enrichment of Clostridia abundance(iron-reducing bacteria(IRBs))was observed in CTS-Fe adding reactor(8.9%-13.8%),which was higher than that in the control reactor(7.9%).The observation further suggesting the acceleration of hydrolysis through dissimilatory iron reduction(DIR)process,thus providing abundant substrates for ***,the presence of CTS-Fe was inhibited the acetoclastic and hydrogenotrophic methanogenesis process,which could be ascribed to the Fe(Ⅲ)act as electron acceptor coupled to methane for anaerobic ***,coenzyme F420 activity in the CTS-Fe added reactor was 34.9% lower than in the blank,also abundance of microorganisms involved in hydrogenotrophic methanogenesis was *** from this study could provide theoretical support for the practical applications of CTS-Fe.

关键词： Chitosan-Fe(Ⅲ)composite Methanogenesis Dissimilatory iron reduction Enzyme activity Microbial community structure