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Wettability and corrosion behavior between alkaline slag from sodium smelting of vanadium-titanium magnetite and refractory substrates

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Journal of Iron and Steel Research International 2024年第6期31卷 1399-1410页

作者： Fei Zhao Zhi-wei Bian Hong-xin Zhao De-sheng Chen zhang-fu yuan Yu-lan Zhen Li-na Wang Tao Qi Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China National Engineering Research Center of Green Recycling for Strategic Metal Resources Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Hebei Zhongke Tongchuang Vanadium&Titanium Technology Co. Ltd.Hengshui 053000HeheiChina

The sodium smelting of vanadium-titanium magnetite can achieve the comprehensive utilization of Fe,V,and ***,the generation of alkaline slag during this process may cause damage to refractory *** wettability and corrosion behavior of alkaline slag on three types of refractory(MgO-C,SiC,and high alumina refractory)substrates were investigated at temperatures up to 1200℃.The effects of duration on the wettability of molten slag on SiC substrates were also *** showed that the high alumina refractory exhibited better wettability with the molten slag than the others,and thus,it is easier to be *** results of scanning electron microscopy coupled with energy dispersive spectroscopy showed that MgO-C and high alumina refractory substrates were severely *** was a visible and regular interfacial reaction layer between the slag and SiC refractory substrate,which was produced by the redox reaction between the metal oxides in the slag and the SiC refractory *** the increase in holding time,the interface layer expands and silico-ferrite phases are generated at the *** redox reaction between Fe_(2)O_(3) and SiC substrate is the main reason for the *** comparing the differences in wettability and corrosion behavior between the alkaline slag from sodium smelting of vanadium-titanium magnetite and MgO-C,SiC and high alumina refractories,it is concluded that SiC refractory has good corrosion resistance to the *** oxides in the slag accelerate the oxidation rate of SiC refractory.

关键词： Wettability Corrosion Alkaline slag-Contact angle Vanadium-titanium magnetite Refractory

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Dissolutive wetting process and interfacial characteristic of molten Sn–17Bi–0.5Cu alloy on copper substrate

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Rare Metals 2013年第6期32卷 537-543页

作者： Bing-Sheng Xu Li-Kun Zang zhang-fu yuan Yan Wu Zhou Zhou Beijing Key Laboratory for Solid Waste Utilization and Management Department of Energy and Resources EngineeringCollege of Engineering Peking University Department of Chemistry School of Chemistry and Biology EngineeringUniversity of Science and Technology Beijing Beijing Key Laboratory for Solid Waste Utilization and Management Department of Energy and Resources Engineering College of Engineering Peking University Beijing Key Laboratory for Solid Waste Utilization and Management Department of Energy and Resources Engineering College of Engineering Peking University

The reactive spreading processes of Sn–17Bi–0.5Cu melt alloy on Cu substrate were studied by sessile drop method in the temperature range of 523–673 *** contact angles between the solder and Cu substrate at different times were recorded with high-resolution CCD digital *** smallest contact angle was observed at623 and 673 *** spreading radius does not increase monotonously with the temperature *** can be attributed to the strong dissolution of Cu substrate into the liquid solder,which hinders the solder from *** line area configuration of the Sn–17Bi–0.5Cu/Cu system was discussed by the description of the equilibrium *** calculated results based on experiments of the tension balances along each of the three interfaces show good agreement with theoretical *** compounds at the Sn–17Bi–0.5Cu/Cu interface are identified as Cu6Sn5adjacent to the solder and Cu3Sn adjacent to the Cu substrate,*** results are of practical interest for composite lead-free solders’preparations and joining of Sn–17Bi–0.5Cu to Cu substrate.

关键词： Lead-free solder Reactive wetting Sessile drop method Interfaces

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CTX-M-14, CTX-M-24 and resistance in Escherichia coli and Klebsiella pneumoniae clinical isolates

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Chinese Medical Journal 2006年第2期119卷 160-164页

作者： XIONG Zi-zhong ZHU De-mei WANG fu zhang Ying-yuan Institute of Antibiotics Huashan Hospital Fudan University Shanghai 200040 China

Extended-spectrum β-lactamases （ESBLs） are the main cause of resistance to the third and forth-generation cephalosporins in Enterobacteriaceae, which are mediated by plasmids and can hydrolyze oxyiminoaminothiazolyl cephalosporins and monobactams. Most of ESBLs are mutants of the classical TEM and SHV types, with one or more amino-acid substitution（s） in the active site.

关键词： extended-spectrum β-lactamases CTX-M-14 CTX-M-24 Escherichia coli Klebsiella pneumoniae

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Roughness-dependent wetting and surface tension of molten lead on alumina

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Transactions of Nonferrous Metals Society of China 2021年第8期31卷 2511-2521页

作者： Zhen QI Liang LIAO Rong-yue WANG Yan-gang zhang zhang-fu yuan Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China

Surface roughness is an important factor that affects the wetting of molten metal on *** effect of surface roughness of the alumina substrate on the contact angle,contact diameter,drop height and surface tension of molten lead was investigated in the temperature range of 923-1123 *** microstructure of the lead/substrate interface was observed by *** surface free energy of alumina substrates was calculated by the geometrical average *** the surface roughness of the substrate increased from 0.092 to 2.23μm,the surface free energy increased gradually,ranging from 13.356 to 39.998 mJ/m^(2).The contact diameter of lead droplets decreased from 9.111 to 7.19 *** lead drop height increased from 3.41 to 3.85 *** contact angle increased from 113.05°to 137.15°.Moreover,the surface depression of the alumina substrate was filled with lead,and no obvious change was *** results demonstrated that the wetting of lead drop on alumina substrates was consistent with the Wenzel state.

关键词： surface roughness wetting surface free energy surface tension alumina

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瘤胃源粪臭素降解菌的分离鉴定及其降解特性研究

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生物技术通报 2024年第3期40卷 305-311页

作者：王璐刘梦雨张富源纪守坤王云张英杰段春辉刘月琴严慧河北农业大学动物科技学院保定071000 河北农业大学食品科技学院保定071000

【目的】旨在从绵羊瘤胃中分离粪臭素降解菌,并评估其粪臭素降解能力和生长性能,以期开发适用于反刍动物降臭的直接饲喂微生物。【方法】以绵羊瘤胃液为分离来源,使用含有粪臭素的MSM培养基进行富集和分离,通过细菌菌落形态观察进行初... 详细信息

【目的】旨在从绵羊瘤胃中分离粪臭素降解菌,并评估其粪臭素降解能力和生长性能,以期开发适用于反刍动物降臭的直接饲喂微生物。【方法】以绵羊瘤胃液为分离来源,使用含有粪臭素的MSM培养基进行富集和分离,通过细菌菌落形态观察进行初步分类;应用16S rRNA基因扩增、测序及系统发育分析进行物种鉴定;绘制菌株生长曲线,通过HPLC技术测定粪臭素降解曲线。【结果】从绵羊瘤胃液中分离出25株粪臭素降解菌,经菌落形态鉴定选出11株代表菌株进行后续研究。物种鉴定结果显示,MSML2和MSML6属于枯草芽孢杆菌(Bacillus subtilis),MSML4、MSML5、MSML7和MSML10属于阿氏普里斯特氏菌(Priestia aryabhattai),MSML3和MSML11属于污染伯克霍尔德氏菌(Burkholderia contaminans),MSML1、MSML8和MSML9属于成都假单胞菌(Pseudomonas chengduensis)。其中,MSML5生长速度最快,在约12 h后进入稳定期,稳定期菌体浓度最高;MSML3和MSML8在前16 h生长缓慢,32 h后进入稳定期。在粪臭素降解方面,MSML2粪臭素降解效率最高,48 h内的降解率达到23.03%,其次是MSML7、MSML8和MSML10,降解率均超过20%。【结论】成功从绵羊瘤胃中分离获得25株粪臭素降解菌,涉及4个物种,首次报道了具备粪臭素降解能力的枯草芽孢杆菌、阿氏普里斯特氏菌和成都假单胞菌,为直接饲喂反刍动物的菌剂开发提供了宝贵的菌株资源。

关键词：瘤胃粪臭素降解率生物降解分离鉴定枯草芽孢杆菌直接饲喂微生物

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Wear-resistant coating spraying technique for wear-proofing cover of coke dry quenching furnace

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Journal of Iron and Steel Research International 2019年第2期26卷 123-129页

作者： zhang-fu yuan Shan-shan Xie Xiang-tao Yu Jian Liu Ping Du Zhi-hua Li Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China Jiangsu Shagang Iron and Steel Research Institute Co. Ltd.Suzhou 215625JiangsuChina

During the operation of a coke dry quenching system of coking plant, wear-proofing cover of the boiler was seriously eroded, and even the ceiling tube of the boiler was worn and torn. Thus, attentions were paid to the research, development and application of the wear-resistant coating spraying technique for wear-proofing cover of the coke dry quenching furnace. The Cr3C2–NiCr coatings for wear-proofing cover were fabricated via supersonic arc spraying process, and the residual coating of wear-proofing cover would be sampled for being analyzed after two years. The coating presents a dense microstructure with few pores and micro-cracks (the porosity is 4.65%). After thermal spraying of the wear-proofing cover, the hardness and the wear resistance of the surface are improved. The remaining coating is continuous and compact, with an average thickness of about 147μm. Transverse micro-cracks parallel to the spreading direction of the coating surface are displayed on different areas of the coating, which demonstrates its serious erosion wear effect. The main chemical component of white zone is Fe–18Cr–Ni. The Cr level of light gray phase is about 77.57 wt.% and the O level is 22.43 wt.%. And the main chemical components of dark gray phase are C, O, Al, Si and Ca. X-ray diffraction patterns were adopted to implement phase analysis on the surface of coating sample, which indicated that the coating was composed of a large amount of Cr3O2 and a small amount of metal Cr.

关键词： Coke dry quenching Wear-proofing cover Thermal spraying technique Coating property Cr3C2-NiCr coating

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Local corrosion mechanism of SiO2-based refractories caused by slag movement near solid–liquid–gas interface in different slag systems

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Transactions of Nonferrous Metals Society of China 2019年第9期29卷 1975-1982页

作者： zhang-fu yuan Shan-shan XIE Xiang-tao YU Yan-gang zhang Rong-yue WANG Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China

Slag movement on SiO2-based prism refractories in different slag systems was observed. The cross section shape evolution mechanism was discussed. Two types of shape evolution appear. For PbO-SiO2 slag whose surface tension improves with SiO2 concentration, slag film flows up along four edges under axial Marangoni shear force and wettability. Then, it flows down along four lateral faces under gravity. Corrosion rate at edges is larger than that on lateral faces due to different SiO2 solubilities of ascending and descending flow. Prism cross section shape changes from square to round. For FetO-SiO2 slag whose surface tension reduces with the increase of SiO2 concentration, slag film flows up under the inflence of wettability. Then, it flows down under Marangoni shear force and gravity. Compared to four edges, slag is mainly up and down on four lateral faces due to larger surface tension and size. So, prism cross section shape keeps square.

关键词： Marangoni convection slag film local corrosion solid-liquid-gas interface SiO2-based refractories

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Development of component stiffness equations for thread-fixed one-side bolt connections to an enclosed rectangular hollow section column under tension

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Frontiers of Structural and Civil Engineering 2024年第4期18卷 568-586页

作者： fu-Wei WU yuan-Qi LI Department of Structural Engineering Tongji UniversityShanghai 200092China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China

The derivation and validation of analytical equations for predicting the tensile initial stiffness of threadfixed one-side bolts(TOBs),connected to enclosed rectangular hollow section(RHS)columns,is presented in this *** unknown stiffness components are considered:the TOBs connection and the enclosed RHS ***,the trapezoidal thread of TOB,as an equivalent cantilevered beam subjected to uniformly distributed loads,is analyzed to determine the associated *** on the findings,the thread-shank serial-parallel stiffness model of TOB connection is *** analysis of the tensile stiffness of the enclosed RHS face due to two bolt forces,the four sidewalls are treated as rotation constraints,thus reducing the problem to a two-dimensional plate *** to the load superposition method,the deflection of the face plate is resolved into three components under various boundary and load *** to the plate deflection theory of Timoshenko,the analytical solutions for the three deflections are derived in terms of the variables of bolt spacing,RHS thickness,height to width ratio,***,the validity of the above stiffness equations is verified by a series of finite element(FE)models of T-stub *** proposed component stiffness equations are an effective supplement to the component-based method.

关键词： initial stiffness component based method thread-fixed one-side bolt rectangular hollow sections analytical equation

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ZmMYC7转录因子调控玉米抗病相关功能的初步研究

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农业生物技术学报 2024年第1期32卷 1-10页

作者：王永桂李薇崔婷茹张福源杨文皓许荡非邢继红曹宏哲董金皋河北农业大学华北作物改良与调控国家重点实验室/河北省植物生理与分子病理学重点实验室保定市气象局张家口市林业工作总站

玉米(Zea mays)是全球最重要的粮食作物之一，病原菌引起的玉米病害直接影响玉米生产，导致巨大的经济损失。转录因子MYC2在植物抗病领域发挥重要作用。本实验室前期获得拟南芥(Arabidopsis thaliana) AtMYC2在玉米中的同源基因ZmMYC7(Z... 详细信息

玉米(Zea mays)是全球最重要的粮食作物之一，病原菌引起的玉米病害直接影响玉米生产，导致巨大的经济损失。转录因子MYC2在植物抗病领域发挥重要作用。本实验室前期获得拟南芥(Arabidopsis thaliana) AtMYC2在玉米中的同源基因ZmMYC7(Zm00001d030028)。为了探究转录因子ZmMYC7在调控玉米抗病过程中的功能，本研究检测ZmMYC7突变体对4种玉米真菌病害的敏感性，利用qRT-PCR技术检测ZmMYC7突变对病程相关蛋白(pathogenesis-related protein, PR)基因表达的影响。结果显示，ZmMYC7与高粱(Sorghum bicolor) SbMYC2的同源性最高(90%);ZmMYC7在玉米的叶和花药中表达水平较高，紫外照射和禾谷镰刀菌(fusarium graminearum)侵染会上调ZmMYC7基因表达；ZmMYC7突变后，玉米对叶和茎部病害的敏感性显著增加，病程相关蛋白基因ZmPRs的表达显著下调(P<0.01)。上述结果提示ZmMYC7可能在玉米抗病过程中发挥作用。本研究为深入解析ZmMYC7调控玉米抗病的分子机制提供基础资料。

关键词： ZmMYC7 病程相关蛋白(PR) 病原体禾谷镰刀菌转录因子

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Cofitness network connectivity determines a fuzzy essential zone in open bacterial pangenome

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mLife 2024年第2期3卷 277-290页

作者： Pan zhang Biliang zhang yuan-yuan Ji Jian Jiao Ziding zhang Chang-fu Tian State Key Laboratory of Plant Environmental Resilience and College of Biological SciencesChina Agricultural UniversityBeijingChina MOA Key Laboratory of Soil Microbiology and Rhizobium Research CenterChina Agricultural UniversityBeijingChina Shenzhen Institute of Synthetic Biology Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenChina State Key Laboratory of Livestock and Poultry Biotechnology Breeding and College of Biological SciencesChina Agricultural UniversityBeijingChina

Most in silico evolutionary studies commonly assumed that core genes are essential for cellular function,while accessory genes are dispensable,particularly in nutrient-rich ***,this assumption is seldom tested genetically within the pangenome *** this study,we conducted a robust pangenomic Tn-seq analysis of fitness genes in a nutrient-rich medium for Sinorhizobium strains with a canonical open *** evaluate the robustness of fitness category assignment,Tn-seq data for three independent mutant libraries per strain were analyzed by three methods,which indicates that the Hidden Markov Model(HMM)-based method is most robust to variations between mutant libraries and not sensitive to data size,outperforming the Bayesian and Monte Carlo simulation-based ***,the HMM method was used to classify the fitness *** genes,categorized as essential(ES),advantage(GA),and disadvantage(GD)genes for growth,are enriched in core genes,while nonessential genes(NE)are over-represented in accessory *** ES/GA genes showed a lower fitness effect than core ES/GA *** degrees in the cofitness network decrease in the order of ES,GD,and GA/*** addition to accessory genes,1599 out of 3284 core genes display differential essentiality across test *** the pangenome core,both shared quasi-essential(ES and GA)and strain-dependent fitness genes are enriched in similar functional *** analysis demonstrates a considerable fuzzy essential zone determined by cofitness connectivity degrees in Sinorhizobium pangenome and highlights the power of the cofitness network in understanding the genetic basis of ever-increasing prokaryotic pangenome data.

关键词： cofitnessnetwork pangenome Tn-seq

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