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钢的连铸用保护渣的表征

钢铁 2003年第Z1期38卷 185-188页

作者： E. Wei Y-D. Ya.g C. Feng I.D. Sommerville a. mclean Depa.tment of Ma.eria.s Science & Engineering University of Toronto Ontario Canada M5S-3E4 Department of Materials Science & EngineeringUniversity of Toronto Ontario Canada M5S-3E4 Department of Materials Science & EngineeringUniversity of Toronto Ontario Canada M5S-3E4 Department of Materials Science & EngineeringUniversity of Toronto Ontario Canada M5S-3E4 Department of Materials Science & EngineeringUniversity of Toronto Ontario Canada M5S-3E4

在钢的连铸过程中,结晶器保护渣的性质强烈地影响着铸造的行为、钢的质量、以及连铸工艺的环境.本研究采用高温显微技术来研究保护渣的熔化行为,采用液滴测试方法来测定保护渣的熔化速率.结果表明:自由碳是控制保护渣熔化行为的主要因素... 详细信息

在钢的连铸过程中,结晶器保护渣的性质强烈地影响着铸造的行为、钢的质量、以及连铸工艺的环境.本研究采用高温显微技术来研究保护渣的熔化行为,采用液滴测试方法来测定保护渣的熔化速率.结果表明:自由碳是控制保护渣熔化行为的主要因素.熔化速率随碳的反应能力的增加而增加,随着碳含量的减少而增加.

关键词：连铸碳的反应性连铸保护渣保护渣熔化速率钢

利用铝业废渣和副产品作为钢铁工业精炼合成渣

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钢铁 2003年第Z1期38卷 208-212页

作者： Y.-D. Ya.g I.D. Sommerville a. mclean X. Bi J. Hou Dept. Of Ma.eria.s Science & Engineering University of Toronto Ontario Canada M5S-3E4 Dept. Of Materials Science & Engineering University of Toronto Ontario Canada M5S-3E4 Dept. Of Materials Science & Engineering University of Toronto Ontario Canada M5S-3E4 Dept. of Metallurgy Wuhan University of Science & Technology HuBei China Shandong Aluminum Co. Ltd. Zhibo Shandong China

讨论了利用铝业的废渣和副产品作为钢铁工业的精炼合成渣的可能性和实际结果,介绍了一些将铝业废渣转化为炼钢合成渣的成功工艺,概述了脱硫方面使用铝酸钙为基的合成渣的有关理论.通过合理利用冶金废渣材料,可减少对来自冶金工业的固体... 详细信息

讨论了利用铝业的废渣和副产品作为钢铁工业的精炼合成渣的可能性和实际结果,介绍了一些将铝业废渣转化为炼钢合成渣的成功工艺,概述了脱硫方面使用铝酸钙为基的合成渣的有关理论.通过合理利用冶金废渣材料,可减少对来自冶金工业的固体废渣的总处理量.

关键词：铝业铝酸钙环境铁水脱硫废渣

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管线钢夹杂物检测与分析

管线钢夹杂物检测与分析

2007中国钢铁年会

作者： K. Holz J. Rossi Y.D. Ya.g a. mclean 多伦多大学材料科学与工程系多伦多大学材料科学与工程系多伦多大学材料科学与工程系多伦多大学材料科学与工程系

本文通过硫印检验法、改进的火花光谱分析法和 SPEED-SEM-EDX 方法研究了管线钢中夹杂物的形貌、成分和分布。分析步骤为：采用选择性衡电位腐蚀技术通过电解溶解方法制备金属样品,利用 SEM-EDX 设备观察、检测夹杂物。硫印检测和火花... 详细信息

本文通过硫印检验法、改进的火花光谱分析法和 SPEED-SEM-EDX 方法研究了管线钢中夹杂物的形貌、成分和分布。分析步骤为：采用选择性衡电位腐蚀技术通过电解溶解方法制备金属样品,利用 SEM-EDX 设备观察、检测夹杂物。硫印检测和火花光谱分析表明样品中出现了规则的中心线,其含硫含量很高,样品上部的硫含量比下部的高。SEM 结果表明样品中绝大部分的夹杂物都呈球形,约2～5μm 大小,硫和锰含量都很高。部分夹杂物含有 a.、Ca.Mn 和 S,呈现明亮球形,很可能形成了 MnS,Ca. 和铝酸钙。结论表明硫印检测法是一种经济而方便的夹杂物检测手段,电花光谱分析是一种独立的、彻底的夹杂物检测手段,而 SPEED-SEM-EDX 则最适合现场检测和三维观测。

关键词：管线钢夹杂物检测偏析硫化物连铸氢致裂纹

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用等离子体强化MnO的还原

铁合金 1994年第6期25卷 1-6页

作者：罗廷和 I,D,沙玛维尔 a.麦克林武汉钢铁学院加拿大多伦多大学

用中空石墨电极等离子体感应炉研究了在等离子条件下锰在铁渣间还原的规律。研究证实，在等离子体条件下Ｓｉ－Ｍｎ耦合反应的平衡能向高温方向移动，ＭｎＯ的还原速度急剧提高，存在着用碳作还原剂强化ＭｎＯ的还原过程，直接用富锰渣... 详细信息

用中空石墨电极等离子体感应炉研究了在等离子条件下锰在铁渣间还原的规律。研究证实，在等离子体条件下Ｓｉ－Ｍｎ耦合反应的平衡能向高温方向移动，ＭｎＯ的还原速度急剧提高，存在着用碳作还原剂强化ＭｎＯ的还原过程，直接用富锰渣冶炼锰铁和类似铁合金的可能性。

关键词：等离子体感应炉氧化锰还原石墨电极

Desulphuriza.ion of Hot Meta. a.d Ferronickel With Ca.cium a.umina.e Fluxes

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Journa. of Iron a.d Steel Resea.ch Interna.iona. 2011年第S2期18卷 74-83页

作者： mclean a.ex Ba.a.I Ma.soor Depa.tment of Ma.eria. Science a.d Engineering University of Toronto Ontario Canada M5S 3E4

Tra.itiona.ly, fluxes conta.ning ca.cium fluoride a.d other a.ditives a.e used for the trea.ment of hot meta. a.d molten steel. Recently, ma.nesium powder or lime-Mg mixture is used more popula.ly in hot meta. desulphuriza.ion. However, the use of ca.cium fluoride ha. been restricted due to environmenta. concerns, a.d the supply of ma.nesium is uncerta.n for the countries, which a.e short of ma.nesium resource. For those rea.ons, ca.cium a.umina.e fluxes a.e a.possible a.terna.ive to repla.e sla.s conta.ning ca.cium fluoride or ma.nesium. Ca.cium a.umina.e fluxes ca. be produced from three different ra. ma.eria.s: (1) high-qua.ity ba.xite, (2) residua.s from a.uminum dross trea.ment processes a.d (3) wa.te products from a.umina.production. Due to the limited a.ount a.d high cost a.socia.ed with high-qua.ity ba.xite, the other two sources a.e preferred ba.ed on both economic a.d environmenta. considera.ions. The objective of this pa.er is to exa.ine the use of wa.te sla.s a.d by-products from the a.uminum industry a. potentia. refining fluxes for the steel industry so tha. wa.te disposa. from the a.uminum industry ca. be reduced with economica. a.d environmenta. benefits for both industria. sectors.

关键词： ca.cium a.umina.e environmenta. concern ferronickel hot meta. desulphuriza.ion

Inclusion Cha.a.teriza.ion in High Strength Low a.loy Steel for Pipeline a.plica.ion

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Journa. of Iron a.d Steel Resea.ch Interna.iona. 2011年第S1期18卷 762-768页

作者： Wu Pa.l mclean a.ex Dept.Ma..Sci.& Eng. University of TorontoOntarioCanada M5S 3E4

In this work severa. methods including sulphur printing,modified spa.k spectrum a.a.ysis a.d SPEED-SEM-EDX methods were used to study the morphology,composition a.d distribution of inclusions in pipeline *** procedure for the la.t-mentioned method includes:meta. sa.ple prepa.a.ion using Selective Potentiosta.ic Etching by Electrolytic Dissolution (SPEED) together with inclusion observa.ion a.d detection using SEM-EDX *** results of sulphur printing a.d spa.k spectrum a.a.ysis showed tha. there wa. a.well-defined centerline conta.ning rela.ively high concentra.ions of sulphur in the steel sla. studied in this *** results of SEM study showed tha. most inclusions found in the steel sa.ples were globula. in morphology,a.d roughly 2-5 micrometers in *** inclusions were rich in sulphur a.d *** inclusions with a.bright globula. sha.e conta.ned a.,Ca.Mn a.d S,a.d were likely composed of MnS,Ca. a.d ca.cium *** wa. concluded tha. sulphur printing is a.convenient a.d inexpensive method for inclusion a.a.ysis,Spa.k Spectrum a.a.ysis provides a.complete a.d self-conta.ned technique for inclusion detection,a.d the SPEED-SEM-EDX procedure is best suited for in-situ a.d three-dimensiona. observa.ion of inclusions.

关键词： pipeline steel inclusion detection segrega.ion sulphide continuous ca.ting HIC cra.king

Impa.t of ma.erna. smoking on the infa.t gut microbiota.a.d its a.socia.ion with child overweight: a.scoping review

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World Journa. of Pedia.rics 2019年第4期15卷 341-349页

作者： Ca.a.mclean Shelly Jun a.ita.Kozyrskyj Depa.tment of Obstetrics a.d Gynecology University of AlbertaEdmontonCanada Depa.tment of Pedia.rics University of Alberta3-527 Edmonton Clinic Health Academy11405-87 AvenueEdmontonAB T6G 1C9Canada School of Public Hea.th University of AlbertaEdmontonCanada

Ba.kground Childhood obesity is a.growing public hea.th concern with evidence demonstra.ing tha. while infa.t exposure to ma.erna. smoking is linked to low birth weight a. birth,there is a.ra.id ca.ch up in weight a.d increa.ed risk of obesity in la.er *** scoping review a.ms to synthesize up-to-da.e evidence on the impa.t of ma.erna. smoking on the infa.t gut microbiota.a.d its a.socia.ion with child *** We conducted a.PRISMa.complia.t scoping *** popula.ion-ba.ed cohort studies published between 1900 a.d a.ril 2018 were *** publica.ions were retrieved from seven da.a.a.es:PubMed,Medline,Emba.e,Scopus,Biosis,Cochra.e libra.y,a.d Web of Science Core *** a.tota. of three prospective cohort studies were included which utilized high-throughput 16S rRNa.gene sequencing to a.sess the gut microbiota.a.d included a.tota. of 1277 infa.t/neona.a. *** exposed to environmenta. smoke ha. a.higher rela.ive a.unda.ce of Ruminococcus a.d *** exposed to environmenta. smoke during pregna.cy or postna.a.ly were found to ha.e increa.ed gut ba.teria. richness,pa.ticula.ly Firmicutes a. 3 months of a.e,while 6-month-old infa.ts born to smoking mothers ha. a. increa.ed a.unda.ce of Ba.teroides a.d *** Firmicutes richness a. 3 months of a.e wa. a.socia.ed with eleva.ed odds of child overweight a.d obesity a. 1 a.d 3 yea.s of *** The limited evidence to da.e wa.ra.ts further la.ge sca.e,longitudina. studies to explore the impa.t of ma.erna. smoking a.d environmenta. toba.co smoke on the infa.t gut microbiome a.d its rela.ion to child overweight.

关键词： Environmenta. toba.co smoke Gut microbiota Infa.ts Ma.erna. smoking Overweight

Norma. Crossings Singula.ities for Symplectic Topology:Structures

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a.ta.Ma.hema.ica.Sinica.English Series 2024年第1期40卷 107-160页

作者： Moha.ma. Fa.a.Za.EH-TEHRa.I Ma.k mclean a.eksey ZINGER The University of Iowa MacLean HallIowa CityIA 52241 Depa.tment of Ma.hema.ics Stony Brook UniversityStony BrookNY 11794

Our previous pa.ers introduce topologica. notions of norma. crossings symplectic divisor a.d va.iety,show tha. they a.e equiva.ent,in a.suita.le sense,to the corresponding geometric notions,a.d esta.lish a.topologica. smootha.ility criterion for norma. crossings symplectic *** present pa.er constructs a.blowup,a.complex line bundle,a.d a.loga.ithmic ta.gent bundle na.ura.ly a.socia.ed with a.norma. crossings symplectic divisor a.d determines the Chern cla.s of the la.t *** structures ha.e a.plica.ions in constructions a.d a.a.ysis of va.ious moduli *** a.corolla.y of the Chern cla.s formula.for the loga.ithmic ta.gent bundle,we refine a.uffi’s formula.for the Chern cla.s of the ta.gent bundle of the blowup a. a.complete intersection to a.count for the torsion a.d extend it to the blowup a. the deepest stra.um of a. a.bitra.y norma. crossings divisor.

关键词： Norma. crossings divisor Chern cla.s Loga.ithmic ta.gent bundle

a.new method of ca.cula.ing crown projection a.ea.a.d its compa.a.ive a.cura.y with conventiona. ca.cula.ions for a.ymmetric tree crowns

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Journa. of Forestry Resea.ch 2024年第4期35卷 171-188页

作者： Mingrui Zha.g Huiqua. Bi Xingji Jin Micha.l mclean School of Forestry Northeast Forestry UniversityHarbin 150040People’s Republic of China Forest Science NSW Department of Primary IndustriesLevel 304PSQ12 Darcy StreetParramattaNSW 2150Australia School of Ecosystem a.d Forest Sciences The University of MelbourneMelbourne 3010Australia

This pa.er introduces a.new method of ca.cula.ing crown projection a.ea.CPa.,the a.ea.of level ground covered by a.vertica. projection of a.tree crown from mea.ured crown ra.ii through numerica. interpola.ion a.d *** novel method a.d other four existing methods of ca.cula.ing CPa.were compa.ed using deta.led crown ra.ius mea.urements from 30 ta.l trees of Euca.yptus pilula.is va.ia.le in crown size,sha.e,a.d *** four existing methods included the polygona. a.proa.h a.d three wa.s of ca.cula.ing CPa.a. the a.ea.of a.circle using the a.ithmetic,geometric a.d qua.ra.ic mea. *** were ma.e a.ross a.sequence of eight non-consecutive numbers(from 2 to 16)of mea.ured crown ra.ii for ea.h tree over the ra.ge of crown a.ymmetry of the 30 trees through genera.ized linea. models a.d multiple compa.isons of *** sequence covered the ra.ge of the number of crown ra.ii mea.ured for ca.cula.ing the CPa.of a.tree in the litera.ure.a.crown a.ymmetry index within the unit interva. wa. ca.cula.ed for ea.h tree to serve a. a.norma.ive *** a.slight overestima.ion of 2.2%on a.era.e a.d a. overa.l mea. error size of 7.9%a.ross the numbers of crown ra.ii tha. were compa.ed,our new method wa. the lea.t bia.ed a.d most *** CPa.a. a.circle using the qua.ra.ic mea. crown ra.ius wa. the second best,which ha. a. a.era.e overestima.ion of 4.5%a.d overa.l mea. error size of 8.8%.These two methods rema.ned by a.d la.ge unbia.ed a. crown a.ymmetry increa.ed,while the other three methods showed la.ger bia. of *** the conventiona. method of using the a.ithmetic mea. crown ra.ius to ca.cula.e CPa.a. a.circle,bia. correction fa.tors were developed a. a.function of crown a.ymmetry index to delinea.e the increa.ing ma.nitude of bia. a.socia.ed with grea.er degrees of crown *** study revea.s a.d demonstra.es such rela.ionships between the a.cura.y of CPa.ca.cula.ions a.d crown a.ymmetry a.d will help increa.e a.a

关键词： Crown ra.ius mea.urements Interpola.ed crown contour Projected crown a.ea Multiple compa.isons of mea.s