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Fractionation of refractory and lithophile elements during planetary evaporation

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Fractionation of refractory and lithophile elements during p...

2019年中国地球科学联合学术年会

作者：卢文华 rick weber 汪方跃 Emma Clark 杜治学李元中国科学院广州地球化学研究所同位素地球化学国家重点实验室 Materials Development Inc. 合肥工业大学资源与环境工程学院

Planetary evaporation, resulted from planetesimals collision and/or Al decay, may be a significant process to modify the chemical and isotopic compositions of Earth in the early solar system（Ringwood, 1992;Sossi et al., 2019;Young et al., 2019）. Earth's heavy Mg isotope composition and depleted moderately volatile elements pattern could

关键词： BSE Fractionation of refractory and lithophile elements during planetary evaporation

Experimental Evidence for the Differentiation of Refractory and Lithophile Elements During Planetary Evaporation

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Experimental Evidence for the Differentiation of Refractory ...

中国矿物岩石地球化学学会第17届学术年会

作者：卢文华 rick weber Emma Clark 汪方跃杜治学李元中国科学院广州地球化学研究所同位素地球化学国家重点实验室

＜正＞How to explain the non-chondritic compositions of some refractory and lithophile elements（RLEs） in the bulk silicate Earth （BSE）（e.g. super-chondritic Mg/Si and sub-chondritic Nb/Ta） is an open question. C...

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Elemental and isotopic fractionation of Si, Mg, Ca, Nb, and Ta during planetary evaporation

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Elemental and isotopic fractionation of Si, Mg, Ca, Nb, and ...

2020年中国地球科学联合学术年会

作者：卢文华 rick weber Emma Clark 马琳张兆峰汪方跃杜治学李元中国科学院广州地球化学研究所 Materials Development Inc.Arlington Heights 中国科学院地质与地球物理研究所合肥工业大学

Planetary evaporation was intrinsic to the planetary formation in the early solar system due to the Al decay and/or the ***-chondritic Mg/Si ratio and heavy isotopic enrichments of Si and Mg in Earth were attributed to the planetary *** how to couple the isotopic fractionation with the mass loss is a *** investigate the elemental and isotopic fractionation caused by evaporation,

关键词： and Ta during planetary evaporation Elemental and isotopic fractionation of Si

Optimizing calcination of coal by-products for maximizing REE leaching recovery and minimizing Al,Ca,and Fe contamination

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Journal of Rare Earths 2024年第7期42卷 1354-1365,I0006页

作者： Tushar Gupta Ahmad Nawab rick Honaker MP Materials Mountain Pass Mine 67750 Bailey RoadMountain PassCA92366USA Department of Mining Engineering University of KentuckyLexingtonKY40506USA

High-temperature calcination is effective in improving the leaching characteristics of rare earth elements(REEs)from conventional REE-bearing minerals by transforming them into more leachable ***,the recovery of contaminants such as Al,Fe,and Ca also increases *** objective of the study was to maximize the REE extraction while minimizing the concentration of contaminant ions(Al,Ca,and Fe)in the leach *** density fractions of the coarse refuse from the Baker and Fire Clay seam coal refuse were pulverized to a top size of 180μm and used as a feedstock for the *** the samples generated from thermal treatment were leached at 1%(w/v)using 1.2 mol/L sulfuric acid at 75℃ for 2 *** results from a parametric program based on a Box-Behnken design were used for modeling and optimization of three operating parameters associated with the lab-scale calcination *** parameters included temperature(400-800℃),ramp rate(2-10℃/min)and holding time(0-120 min).It was determined that the calcination temperature was the most significant parameter influencing REE *** majority of the heavy rare earth elements(HREEs)were found to be present in an insoluble form in the calcination products and were marginally affected by thermal treatment.A strong correlation between light rare earth elements recovery(LREEs)and Al suggested a possible association with *** optimum operating conditions for high REE recovery with comparatively lower contaminant concentration for 1.6 specific gravity float and 2.2 sink fractions of Baker and Fire Clay seam material were determined to be at 776,800℃ and 407,800℃,calcining temperatures,respectively.A higher optimum temperature of 1.6 float fraction of Baker seam relative to Fire Clay seam material was due to elevated pyrite concentration in Baker seam *** treatment at 400℃ converted pyrite into a soluble intermedium iron oxide,resulting in a high Fe content in the ***

关键词： Calcination Optimization Rare earth elements Coal refuse

Impaired glucocorticoid receptor expression and mitochondrial metabolism in MDSCs contribute to glucocorticoid resistance in immune thrombocytopenia

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Cellular & Molecular Immunology 2022年第7期19卷 858-860页

作者： rick Kapur Sanquin Research Department of Experimental ImmunohematologyAmsterdam and Landsteiner LaboratoryAmsterdam UMCUniversity of AmsterdamAmsterdamThe Netherlands

In this issue of Cellular&Molecular Immunology,Hou and coworkers provide novel insights into glucocorticoid(GC)treatment refractoriness in immune thrombocytopenia(ITP),reporting that myeloid-derived suppressor cells(MDSCs)contribute to GC resistance in ITP via impairments in their glucocorticoid receptor(GR)expression and mitochondrial metabolism[1].

关键词： metabolism glucocorticoid Immunology

Nanobubble generation and its applications in froth flotation(part Ⅱ):fundamental study and theoretical analysis

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Mining Science and Technology 2010年第3期20卷 159-177页

作者： TAO Daniel HONAKER rick Department of Mining Engineering University of Kentucky

Froth flotation is a commonly employed technology to improve the quality of raw coal and *** and minerals particle size and surface hydrophobicity are two main parameters that affect three key steps in froth flotation process:particle-bubble collision,adhesion,and *** paper fundamentally investigated the effects of nanobubble on coal and phosphate *** has been found that the presence of nanobubble in flotation pulp could widen the coal and phosphate flotation particle size range,increase the particle surface hydrophobicity,and thus improve the coal and phosphate froth flotation recovery.

关键词： coal phosphate froth flotation cavitation nanobubble Zeta potential

Inclusion engineering and metallurgy of calcium treatment

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Journal of Iron and Steel Research International 2018年第2期25卷 133-145页

作者： Sunday Abraham rick Bodnar Justin Raines Yufeng Wang SSAB Americas Muscatine IA 52761 USA

Although a great deal of research has been done in the area of inclusion control during steelmaking, a complete description of the process of inclusion modification and shape control cannot be found in literatures. As a result, the terms ＂inclusion modification＂ and ＂shape control＂ are often used loosely in the technical community. To utilize the full potential offered by a calcium treatment, it is important to understand why an inclusion whose composition has been modified may not necessarily have its shape modified. With the purpose of decoupling the process of inclusion phase change from inclusion shape control, and to provide a complete description of the metallurgy of calcium treatment, a detailed literature survey has been performed on the subject. By coupling the survey with a new concept developed to tailor the cleanliness of steels to the intended applications, the hope is to provide the reader with valuable information on calcium treatment for inclusion modification and shape control.

关键词： Nonmetallic inclusion Cleanliness Calcium treatment Inclusion modification Inclusion shape control

Sporophytic nondisjunction of the maize B chromosome at high copy numbers

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Journal of Genetics and Genomics 2010年第1期37卷 79-84页

作者： rick E.Masonbrink James A.Birchler Division of Biological Sciences University of Missouri

It has been known for decades that the maize B chromosome undergoes nondisjunction at the second pollen *** in-situ hybridization （FISH） was used to undertake a quantitative study of maize plants with differing numbers of B chromosomes to observe if instability increases by increasing B dosage in root tip tissue.B chromosome nondisjunction was basically absent at low copy number,but increased at higher B ***,B nondisjunction rates are dependent on the dosage of B＇s in the *** in nondisjunction were also documented between odd and even doses of the *** plants that have inherited odd numbered doses of the B chromosome,B loss is nearly twice as likely as B gain in a somatic *** comparing plants with even doses of B＇s to plants with odd doses of B＇s,plants with even numbers had a significantly higher chance to increase in ***,the B＇s nondisjunctive capacity,previously thought to be primarily restricted to the gametophyte,is present in sporophytic cells.

关键词： maize Zea mays B chromosome nondisjunction odd-even effect

Organ-on-a-chip platforms for evaluation of environmental nanoparticle toxicity

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Bioactive Materials 2021年第9期6卷 2801-2819页

作者： rick Xing Ze Lu Milica Radisic Institute of Biomedical Engineering University of TorontoTorontoONCanada Department of Chemical Engineering and Applied Chemistry University of TorontoTorontoONCanada Toronto General Research Institute University Health NetworkTorontoONCanada The Heart and Stroke/Richard Lewar Centre of Excellence TorontoONCanada

Despite showing a great promise in the field of nanomedicine,nanoparticles have gained a significant attention from regulatory agencies regarding their possible adverse health effects upon environmental *** those nanoparticles are generated through intentional or unintentional means,the constant exposure to nanomaterials can inevitably lead to unintended consequences based on epidemiological data,yet the current understanding of nanotoxicity is insufficient relative to the rate of their emission in the environment and the lack of predictive platforms that mimic the human *** calls for a development of more physiologically relevant models,which permit the comprehensive and systematic examination of toxic properties of *** the advancement in microfabrication techniques,scientists have shifted their focus on the development of an engineered system that acts as an intermediate between a well-plate system and animal models,known as *** ability of organ-on-a-chip models to recapitulate in vivo like microenvironment and responses offers a new avenue for nanotoxicological *** this review,we aim to provide overview of assessing potential risks of nanoparticle exposure using organ-on-a-chip systems and their potential to delineate biological mechanisms of epidemiological findings.

关键词： Organ-on-a-chip Toxicity Nanoparticles