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Fe-Si particles on the surface of blast furnace coke

International journal of minerals,metallurgy and materials 2015年第7期22卷 697-703页

作者： Stanislav S.Gornostayev Eetu-Pekka Heikkinen jyrki j.Heino timo m.j.fabritius Process metallurgy Group University of Oulu

This study investigates the surface of unpolished samples of blast furnace （BF） coke drilled from the tuyere zone, which hosts Fe-Si particles （mostly Fe3Si） that vary in size, shape, depth of submersion （penetration） into the coke matrix, and contact features with the surface. Based on the shape of the particles and the extent of their contact with the coke matrix, they have been grouped into three major types：（I） sphere-like droplets with limited contact area, （II） semi-spheres with a larger contact area, and （III） irregular segregations with a spherical surface, which exhibit the largest contact area among the three types of particles. Considering the ratio between the height （h） of the particles and half of their length at the surface level （/） along the cross-section, these three types can be characterized as follows：（I） h 〉/, （II） h ~/, and （1II） h 〈/. All the three types of particles can be found near each other. The shape and the extent of the contact depend on the de- gree of penetration of the material into the matrix, which is a function of the composition of the particles. Type （I） particles were initially saturated with Si at an earlier stage and, for that reason, they can react less with carbon in the coke matrix than type （II） and （III）, thereby moving faster through the coke cone. Thermodynamic calculations have shown that the temperature interval of 1250-1300~C can be consid- ered the starting point for Si entering into molten iron under quartz-dominated coke ash. Accordingly, the initial pick-up of Si by molten iron can be assumed to be mineral-related. In terms of BF practice, better conditions for sliding Fe-Si droplets through the coke cone are available when they come into contact with free SiO2 concentrated into small grains, and when the SiO2/∑mexOy mass ratio in the coke ash is high.

关键词： blast furnace practice metallurgical coke molten iron iron silicide

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Fe-Si droplets associated with graphite on blast furnace coke

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International journal of minerals,metallurgy and materials 2012年第6期19卷 478-482页

作者： Stanislav S.Gornostayev timo m.j.fabritius Olavi Kerkkonen jouko j.Hrkki Laboratory of Process metallurgy University of OuluOulu 90014Finland Ruukki metals Oy Raahe 92102Finland

Fe-Si droplets on the surface of blast furnace （BF） coke from 25 to 50 cm at the tuyere level are mostly composed of Fe3Si, which has various shapes （round, elongated, and irregular） and penetration degrees into the BF coke matrix. The shapes and penetration degrees may depend on the saturation of molten iron by silicon during interaction with the coke matrix. The droplets are covered by a tiny shell of carbon. Graphite observed inside the droplets can be divided into two categories： well-formed tabular crystals with relatively large size and flakes with structures similar as those in cast iron. The textures of the droplets reflect composition, interaction with the coke matrix, and cooling conditions.

关键词： metallurgical coke graphite iron blast furnaces

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Textural changes in metallurgical coke prepared with polyethylene

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International journal of minerals,metallurgy and materials 2014年第10期21卷 969-973页

作者： Stanislav S.Gornostayev jyrki j.Heino Tommi m.T.Kokkonen Hannu T.makkonen Satu m.m.Huttunen timo m.j.fabritius Laboratory of Process metallurgy University of Oulu

The effect of high-density polyethylene （HDPE） on the textural features of experimental coke was investigated using polar- ized-light optical microscopy and wavelet-based image analysis. metallurgical coke samples were prepared in a laboratory-scale furnace with 2.5%, 5.0%, 7.5%, 10.0%, and 12.5% HDPE by mass, and one sample was prepared by 100% coal. The amounts and distribution of textures （isotropic, mosaic and banded） and por^s were obtained. The calculations reveal that the addition of HDPE results in a decrease of mosaic texture and an increase of isotropic texture. Ethylene formed from the decomposition of HDPE is considered as a probable reason for the texture modifications. The approach used in this study can be applied to indirect evaluation for the reactivity and strength of coke.

关键词： metallurgical coke texture image analysis polyethylene

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Piezo1 expression in chondrocytes controls endochondral ossification and osteoarthritis development

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Bone Research 2024年第1期12卷 199-214页

作者： Laura j.Brylka Assil-Ramin Alimy miriam E.A.Tschaffon-müller Shan jiang Tobias malte Ballhause Anke Baranowsky Simon von Kroge julian Delsmann Eva Pawlus Kian Eghbalian Klaus Püschel Astrid Schoppa melanie Haffner-Luntzer David j.Beech Frank timo Beil michael Amling johannes Keller Anita Ignatius Timur A.Yorgan Tim Rolvien Thorsten Schinke Department of Osteology and Biomechanics University Medical Center Hamburg-Eppendorf20246 HamburgGermany Department of Trauma and Orthopedic Surgery University Medical Center Hamburg-Eppendorf20246 HamburgGermany Institute of Orthopedic Research and Biomechanics University Medical Center UlmBadenWürttemberg89081 UlmGermany Department Legal medicine University Medical Center Hamburg-Eppendorf20246 HamburgGermany Leeds Institute of Cardiovascular and metabolic medicine School of MedicineUniversity of LeedsLS29JT LeedsUK

Piezo proteins are mechanically activated ion channels,which are required for mechanosensing functions in a variety of cell *** we and others have previously demonstrated that the expression of Piezo1 in osteoblast lineage cells is essential for boneanabolic processes,there was only suggestive evidence indicating a role of Piezo1 and/or Piezo2 in *** we addressed the question if and how chondrocyte expression of the mechanosensitive proteins Piezo1 or Piezo2 controls physiological endochondral ossification and pathological osteoarthritis(OA)*** with chondrocyte-specific inactivation of Piezo1(Piezo1^(Col2a1Cre)),but not of Piezo2,developed a near absence of trabecular bone below the chondrogenic growth plate ***,all Piezo1^(Col2a1Cre) animals displayed multiple fractures of rib bones at 7 days of age,which were located close to the growth *** skeletal growth was only mildly affected in these mice,OA pathologies were markedly less pronounced compared to littermate controls at 60 weeks of ***,when OA was induced by anterior cruciate ligament transection,only the chondrocyte inactivation of Piezo1,not of Piezo2,resulted in attenuated articular cartilage ***,osteophyte formation and maturation were also reduced in Piezo1^(Col2a1Cre) *** further observed increased Piezo1 protein abundance in cartilaginous zones of human ***,we identified Ptgs2 and Ccn2 as potentially relevant Piezo1 downstream genes in ***,our data do not only demonstrate that Piezo1 is a critical regulator of physiological and pathological endochondral ossification processes,but also suggest that Piezo1 antagonists may be established as a novel approach to limit osteophyte formation in OA.

关键词： Piezo1 markedly ossification

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Effect of Blast Furnace Sludge (BFS) Characteristics on Suitable Recycling Process Determining

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journal of minerals and materials Characterization and Engineering 2017年第4期5卷 185-197页

作者： mamdouh Omran timo fabritius timo Paananen Process metallurgy Research Group Faculty of Technology University of Oulu Oulu Finland mineral Processing and Agglomeration Lab Central Metallurgical Research and Development Institute Cairo Egypt SSAB Europe Raahe Finland

The present study aims to give a detailed characterization of blast furnace sludge (BFS) by using different techniques, in order to determine the most effective recycling method to recover valuable metals from this waste. BFS is composed mainly of hematite, as its iron-bearing phase, and carbon, in addition to fractions of silicate and carbonate materials. The studied BFS shows relatively high contents of iron (Fe) (390 ***-1), and carbon (C) (290 ***-1), due to abundance of hematite and coke, while the concentration of zinc (Zn) (2.5 ***-1) is low. The XRD analyses indicated that, hematite is more concentrated in the fine fraction (m), while the coarser fraction (90 - 250 μm) is dominated by calcite, quartz and X-ray amorphous coke. SEm-EDX analyses confirmed that particles rich in iron and zinc were detected in the fine fraction (m) of the sludge. Due to high Fe and C content in BFS, it can be utilized as self-reducing material and briquetting represent a potential method for recycling of blast furnace sludge.

关键词： Blast Furnace Sludge (BFS) Characterization Recycling

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Exercise cardiac power and the risk of heart failure in men:A population-based follow-up study

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journal of Sport and Health Science 2022年第2期11卷 266-271页

作者： Sudhir Kurl Sae Young jae timo H.makikallio Ari Voutilainen magnus j.Hagnas jussi Kauhanen jari A.Laukkanen Institute of Public Health and Clinical Nutrition Department of MedicineUniversity of Eastern FinlandKuopio 70210Finland Department of Sports Informatics College of Arts and Physical EducationUniversity of SeoulSeoul 130-743Republic of Korea Division of Cardiology Department of Internal MedicineUniversity Hospital of OuluOulu 90220Finland Department of Internal medicine Lapland Central HospitalRovaniemi 96400Finland Faculty of Sport and Health Sciences University of JyvaskylaJyvaskyla 40620Finland Central Finland Health Care District Jyvaskyla 40620Finland

Background:Little is known about exercise cardiac power(ECP),defined as the ratio of directly measured maximal oxygen uptake with peak systolic blood pressure during exercise,on heart failure(HF)*** examined the association of ECP and the risk of ***:This was a population-based cohort study of 2351 men from eastern *** average time to follow-up was 25 *** participated at baseline in an exercise stress test.A total of 313 cases of HF ***:men with low ECP(mL/mmHg,the lowest quartile)had a 2.37-fold(95%confidence interval(95%CI):1.68-3.35,pmpared with men with high ECP(>13.92 mL/mmHg,the highest quartile),after adjusting for *** ECP was associated with a 1.96-fold risk(95%CI:1.38-2.78,pjustment for conventional risk *** further adjustment for left ventricular hypertrophy,the results hardly changed(hazards ratio=1.87,95%CI:1.31-2.66,pmL/mmHg)was associated with a decreased risk of HF by 28%(95%CI:17%-37%).Conclusion:ECP provides a noninvasive and easily available measure from cardiopulmonary exercise tests in predicting ***,ECP did not provide additional value over maximal oxygen uptake.

关键词： Exercise cardiac power Heart failure men

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COLOR THEORETICAL APPROACH TO OPTICAL PROPERTIES OF PRINTING PAPERS

COLOR THEORETICAL APPROACH TO OPTICAL PROPERTIES OF PRINTING...

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26th Session of the CIE

作者： mkinen martti jskelinen timo Parkkinen jussi University of joensuu Department of Mathematics and Physics University of joensuu Department of Mathematics and Physics University of joensuu Department of Computer Science

＜正＞Perceived color of an object depends on lightness,hue and ***,many optical standards of the paper industry,such as opacity and print-through standards,take into account only *** may be adequate for evaluating black print and white paper,but not for colored prints or *** standard definitions of opacity and print-through,a color difference model is able to predict perceived covering ability of a sheet of paper satisfactory regardless of the color of the paper and the print.

关键词： Opacity Print-through CIELAB CIE94

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AOD过程基本的数学模拟

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世界钢铁 2012年第6期12卷 18-24+51页

作者： mika jrvinen Sauli Pisil Aki Krn Ville-Valtteri Visuri timo fabritius Topi Ikheimonen Pentti Kupari 李青阿尔托大学奥卢大学奥托昆普不锈钢公司

针对AOD(氩氧脱碳)过程提出了一个新的仿真模型,模型考虑了局部的变化,但仍然保证了计算的高效性。一个新的思路就是把AOD转炉作为流股区的活塞流反应器和熔池与表面熔渣的连续搅拌池反应器的组合来模拟。这种方法比之以前的模型有很多... 详细信息

针对AOD(氩氧脱碳)过程提出了一个新的仿真模型,模型考虑了局部的变化,但仍然保证了计算的高效性。一个新的思路就是把AOD转炉作为流股区的活塞流反应器和熔池与表面熔渣的连续搅拌池反应器的组合来模拟。这种方法比之以前的模型有很多优点。首先,它提供了考虑气泡在流股中上升过程局部变化条件的有效方法。因为变量更少,相对于计算流体动力学(CFD)模型,这种构造使其能够非常高效地运算。模型的验证也更容易,因为它具有可被试验确定的特征。将模型与两种不同的试验(高Cr和低Cr钢种)情况进行了对比,结果表明,模型对脱碳和Cr行为的预测很好。利用模型输出结果可以获得主导机制的信息,更为重要的是何种元素主要参与氧的反应。模型给出了不同成分的元素如何在喷嘴附近区域首先发生氧化,之后又在熔渣上浮过程中被部分还原。模型同时包含了对氮行为的模拟,因此可以系统地用于优化脱氮。

关键词： AOD 模拟传质化学反应过程模型

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Antiferromagnetism and p-type conductivity of nonstoichiometric nickel oxide thin films

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Infomat 2020年第4期2卷 769-774页

作者： mari Napari Tahmida N.Huq Tuhin maity Daisy Gomersall Kham m.Niang Armin Barthel juliet E.Thompson Sami Kinnunen Kai Arstila timo Sajavaara Robert L.ZHoye Andrew j.Flewitt judith L.macmanus-Driscoll Department of materials Science and metallurgy University of CambridgeCambridgeUK Electrical Engineering Division Department of EngineeringUniversity of CambridgeCambridgeUK Department of Physics University of JyvaskylaJyvaskylaFinland Zepler Institute for Photonics and Nanoelectronics University of SouthamptonSouthamptonUK

Nickel oxide(NiO)is one of the most studied transition metal oxides due to its versatile chemical and electronic properties,enabling it to be used in a wide variety of *** its stoichiometric form,NiO is an antiferromagnetic insulator,with resistivity up to 10^13Ωcm.1 When Ni vacancies are introduced,the nonstoichiometric nickel oxide becomes a semiconductor.

关键词： atomic layer deposition chemical vapor deposition nickel oxide solution deposition thin films

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A roadmap for research in octoploid strawberry

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Horticulture Research 2020年第1期7卷 2300-2316页

作者： Vance m.Whitaker Steven j.Knapp michael A.Hardigan Patrick P.Edger janet P.Slovin Nahla V.Bassil timo Hytönen Kathryn K.mackenzie Seonghee Lee Sook jung Dorrie main Christopher R.Barbey Sujeet Verma University of Florida Institute of Food and Agricultural SciencesGulf Coast Research and Education CenterWimaumaFlorida 33598USA Department of Plant Sciences University of CaliforniaDavisCA 95616USA Department of Horticulture Michigan State UniversityEast LansingMI 48824USA USDAARS Genetic Improvement of Fruits and Vegetables Laboratory BeltsvilleMA 20705USA USDA-ARS National Clonal Germplasm Repository CorvallisOR 97333USA Department of Agricultural Sciences Viikki Plant Science CentreUniversity of HelsinkiHelsinki 00790Finland Organismal and Evolutionary Biology Research Programme Faculty of Biological and Environmental SciencesViikki Plant Science CentreUniversity of HelsinkiHelsinki 00790Finland NIAB EmR Kent ME196BJUK Department of Horticulture Washington State UniversityPullmanWA 99164USA

The cultivated strawberry(Fragaria×ananassa)is an allo-octoploid species,originating nearly 300 years ago from wild progenitors from the *** that time the strawberry has become the most widely cultivated fruit crop in the world,universally appealing due to its sensory qualities and health *** recent publication of the first highquality chromosome-scale octoploid strawberry genome(***)is enabling rapid advances in genetics,stimulating scientific debate and provoking new research *** this forward-looking review we propose avenues of research toward new biological insights and applications to *** these are the origins of the genome,characterization of genetic variants,and big data approaches to *** areas of research in molecular biology will include the control of flowering,fruit development,fruit quality,and plant–pathogen *** order to realize this potential as a global community,investments in genome resources must be continually augmented.

关键词： straw cultivated looking

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