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Fluidization behavior and reducibility of iron ore fines during hydrogen-induced fluidized bed reduction

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Particuology 2020年第5期18卷 36-46页

作者： daniel Spreitzer Johannes Schenk Chair of Ferrous Metallurgy Montanuniversitaet LeobenFranz-Josef-Straβe 188700 LeobenAustria

A laboratory fluidized bed reactor was used to investigate the fluidization behavior and reducibility of various iron ore *** was chosen as a reducing agent across a temperature range of 873-1073 *** magnetite ore used exhibited strong sticking behavior after the initiation of metallic iron *** other tested ores fluidized sufficiently well when subjected to the same high reduction *** kinetic analysis was conducted using a previously developed model to include three rate-limiting step *** trend of apparent activation energy was correlated with the degree of ***,the influence of varying the specific gas rate was *** results show the variation in reducibility as a result of different interactions,which influence the rate-limiting mechanisms of nucleation and the undertaken chemical reactions,which vary as a function of temperature and degree of *** apparent activation energies,determined from the reduction of wtistite to metallic iron,were in the range of 15-60 kJ/mol,depending on the iron ore used and the degree of *** change in apparent activation energy deriving from the increased specific gas rate can be explained by an increasing nucleation effect,especially at lower reduction temperatures.

关键词： Fluidized bed Iron ore reduction Hydrogen Fluidization behavior Kinetic analysis

Interplay of transport processes and interfacial chemistry affecting chromium reduction and reoxidation with iron and manganese

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Frontiers of Environmental Science & Engineering 2020年第5期14卷 55-63页

作者： Chao Pan daniel Giammar Department of Energy Environmentaland Chemical EngineeringWashington University in St.LouisSt.LouisMO 63130USA Present affiliation:Glenn *** Institute Physical&Life SciencesLawrence Livermore National LaboratoryLivermoreCA 94550USA

Hexavalent chromium(Cr(Ⅵ))is a water-soluble pollutant in soil and groundwater,the mobility,bioavailability,and toxicity of which can be controlled by transforming to less mobile and more environmentally benign Cr(Ⅲ)by ways of *** review focused on recent advances in identifying the reaction pathways,kinetics,and products of iron-based techniques for Cr(Ⅵ)*** also examines new information regarding remobilization of Cr(Ⅲ)in the existence of complexing ligands and manganese(Mn)of different oxidation states.A range of iron-based techniques can remove Cr(Ⅵ)from water by adsorption or reduction-coprecipitation ***,the success of a chromium treatment or remediation strategy requires the stability of the Cr(Ⅲ)-containing solids with respect to solubilization or reoxidation in the settings they are *** is ubiquitous in aquatic and terrestrial environments,and the redox cycling of manganese may greatly influence the fate,transport,and distribution of *** of redox reactions of chromium,iron,and manganese involves reaction pathways not only in the aqueous phase but also at solid-aqueous *** provide a quantitative understanding of these processes,it is essential to develop mechanistically based kinetic and transport *** research should be made on iron-based treatment of Cr(Ⅵ)-contaminated water and soils and the stability of the subsequently produced Cr(Ⅲ)-containing solids at environmentally relevant conditions,which will support improved predictions of chromium's environmental fate and transport and aid in decision-making for remediation and treatment of Cr contamination.

关键词： Chromium(Ⅵ)contamination Redox reaction Iron oxide Manganese oxide Modeling

Neuronal circuitry reconstruction after stem cell therapy in damaged brain

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Neural Regeneration Research 2022年第9期17卷 1959-1960页

作者： daniel Tornero Department of Biomedical Sciences Institute of Neuroscience and Production and Validation Center of Advanced Therapies(Creatio)University of Barcelona August Pi I Sunyer Biomedical Research Institute(IDIBAPS) Network Center for Biomedical Research in Neurodegenerative Diseases(CIBERNED) BarcelonaSpain

Transplantation of neuronal precursors derived from human pluripotent stem cells is a promising therapy for the treatment of neurological disorders associated with neuronal loss,such us neurodegenerative diseases,brain trauma and *** functional integration of grafted neurons differentiated from stem cells into the host injured neuronal circuitry has been a major challenge in cell therapy strategies for brain repair(Palma-Tortosa et al.,2021).Even though other cell types or mechanisms may provide modest clinical improvements,neuronal replacement and reconstruction of the damaged area are crucial for an optimal and long-term recovery.

关键词： diseases damaged

Expansion of Small Terrestrial Mammals and Their Parasites into the Barun Valley (Makalu Mt. Region, Nepal Himalaya) Linked with Changes in Glaciation and Human Activities

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Journal of Mountain Science 2015年第1期12卷 14-29页

作者： Milan daniel National Institute of Public Health ?robárova 48 100 42 Prague 10 Czech Republic

The article is based on collection of small terrestrial mammals(Soriculus nigrescens,Episoriculus caudatus, Neodon sikimensis,Alticola stoliczkanus, Niviventer eha and Ochotona roylei) collected in the Barun Valley, east Nepal in the pre-monsoon period of *** and ecological characteristics and altitudinal stratification of these species are analysed, depending both on abiotic(geomorphological and climatic) and biotic(vegetation, and human presence and activities)factors. All the captured mammals were examined for ecto- and endoparasities. Infestations of Trombiculid mites and Ixodid ticks were tightly linked to the local habitat where these ectoparasites must survive during their nonparasitic phase. Analysis of their occurrence completes the reconstruction of migration routes during the expansion of small mammals into the Barun Valley and the exacerbating influence of human activities(summer pasturing,mountaineering expeditions and trekking parties).An indicator of anthropogenic influence was the occurrence of synantropic flies. The potential medical importance of these findings is *** is assumed a possible occurrence of arboviruses transmitted by ticks and also rickettsioses(transmitted by ticks and chigger mites). As far bacteriological infections, plague cannot be excluded.

关键词： Himalaya Barun Makalu region Small mammal Parasite Ecology Medicalimportance

Co-located quantitative trait loci mediate resistance to Agrobacterium tumefaciens, Phytophthora cinnamomi,and *** in Juglans microcarpa×*** hybrids

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Horticulture Research 2021年第1期8卷 1363-1373页

作者： Ramesh K.Ramasamy Ming-Cheng Luo Charles A.Leslie Dianne Velasco Natalia Ott Ali McClean Abhaya M.Dandekar Mallikarjuna Aradhya Patrick J.Brown Gregory T.Browne daniel A.Kluepfel Andreas westphal Jan Dvorak Department of Plant Sciences University of CaliforniaDavisUSA USDA-ARS Crops Pathology and Genetics Research Unit Department of Plant PathologyUniversity of CaliforniaDavisUSA National Clonal Germplasm Repository USDA-ARSUniversity of CaliforniaDavisUSA Department of Nematology University of CaliforniaRiversideUSA

Soil-borne plant pathogens represent a serious threat that undermines commercial walnut(Juglans regia)production *** gall,caused by Agrobacterium tumefaciens,and Phytophthora root and crown rots,caused by various Phytophthora spp.,are among the most devastating walnut soil-borne diseases.A recognized strategy to combat soil-borne diseases is adoption of resistant ***,resistance to ***,***,and *** is mapped in the genome of Juglans microcarpa,a North American wild relative of cultivated ***-sib *** mother trees DJUG 31.01 and DJUG 31.09 were crossed with *** ***,producing 353 and 400 hybrids,*** propagated hybrids were genotyped by sequencing to construct genetic maps for the two populations and challenged with the three *** to each of the three pathogens was mapped as a major QTL on the long arm of *** chromosome 4D and was associated with the same haplotype,designated as haplotype b,raising the possibility that the two mother trees were heterozygous for a single Mendelian gene conferring resistance to all three *** deployment of this haplotype in rootstock breeding will facilitate breeding of a walnut rootstock resistant to both crown gall and Phytophthora root and crown rots.

关键词： breeding regia soil

Gauge Inverse Monoids

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Algebra Colloquium 2020年第2期27卷 181-192页

作者： Emil daniel Schwab Department of Mathematical Sciences The University of Texas at El Paso El PasoTexas 79968USA

The paper introduces a class of inverse(sub)monoids which contains Jones-Lawson’s gauge inverse(sub)*** aim is to give examples and the basic properties of these ***-Lawson’s gauge inverse monoid,as an inverse submonoid of the polycyclic monoid,is the prototype in our development *** generalization leads also to Mea-kin-Sapir type results involving bijections between special congruences and special wide inverse submonoids.

关键词： inverse semigroup gauge inverse monoid polycyclic monoid

A pharmacologist's journey in medical education:a personal history

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Acta Pharmacologica Sinica 2004年第9期25卷 102-106页

作者： E E daniel AB T6G 2H7 Canada Department of Pharmacology Room 9-10 Edmonton MSB University of Alberta

My journey as an educator in Pharmacology began in 1949, when, after finishing my MA in Biology at Johns Hopkins, Ⅰ decided that Ⅰ wanted to be involved in science with more relevance to humans. Ⅰhad been chasing f... 详细信息

关键词： ACE A pharmacologist’s journey in medical education

Barriers to Insurance as a Flood Risk Management Tool:Evidence from a Survey of Property Owners

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International Journal of Disaster Risk Science 2020年第3期11卷 263-273页

作者： Jason Thistlethwaite daniel Henstra Craig Brown daniel Scott School of Environment Enterprise and DevelopmentUniversity of WaterlooWaterlooON N2L 3G1Canada Department of Political Science University of WaterlooWaterlooON N2L 3G1Canada Climate Change and Health Adaptation Planning Vancouver Coastal HealthVancouverBC V5Z 4C2Canada Department of Geography and Environmental Management University of WaterlooWaterlooON N2L 3G1Canada

By using risk-adjusted price signals to transfer responsibility for property-level flood protection and recovery from governments to property owners,flood insurance represents a key tenet of the flood risk management(FRM)*** Government of Canada has worked with insurers to introduce flood insurance for the first time as a part of a broader shift towards FRM to limit the growing costs of *** viability of flood insurance in Canada,however,has been questioned by research that disputes the utility of purchasing coverage by property *** study tested this assumption by drawing on public opinion survey data to assess factors that influence decisions about the utility of *** findings reveal that Canadians have limited knowledge of flood insurance coverage,exhibit a low willingness-to-pay for both insurance and property-level flood protection measures,and expect governments to shoulder much of the financial burden of flood recovery through disaster assistance.

关键词： Flood insurance Flood risk management Risk-sharing Willingness-to-pay

A limit equilibrium fracture zone model to investigate seismicity in coal mines

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International Journal of Mining Science and Technology 2018年第5期28卷 745-753页

作者： daniel Malan John Napier Department of Mining Engineering Faculty of Engineering Built Environment and IT University of Pretoria

This paper explores possible synergies between techniques used to minimise seismicity in deep South African gold mines and their applicability to control coal bumps. The paper gives a summary of the techniques used in the deep gold mines and a critical appraisal if these are useful in coal mines. The techniques typically include control of mining rate, preconditioning, optimisation of extraction sequences and centralised blasting. Of particular interest to the coal bump problem is an experimental limit equilibrium fracture zone model implemented in a displacement discontinuity code. This was recently developed for the gold mines to enable the interactive analysis of complex tabular mine layout extraction sequences. The model specifically accommodates energy dissipation computations in the developing fracture zone near the edges of these excavations. This allows the released energy to be used as a surrogate measure of ongoing seismic activity and addresses a number of the weaknesses in the traditional usage of this quantity as a criterion for the design of seismically active layouts. This paper investigates the application of the model to a hypothetical coal longwall layout and the specific problem of coal bumps.

关键词： Coal bumps Limit equilibrium model Mining rate Seismicity