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Identification of secondary raw materials in mold powders and their melting behavior

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Journal of Iron and Steel Research International 2019年第4期26卷 403-411页

作者： Irmtraud Marschall Nathalie Kolbl Harald Harmuth christina Atzenhofer KI-MET GmbH 8700 LeobenAustria Department Mineral Resources Engineering Chair of CeramicsMontanuniversitaet Leoben8700 LeobenAustria

Commercial mold powders use a limited number of main mineral constituents,but may differ significantly in chemical *** main mineral raw materials of specimens investigated here are quartz,fluorite and free carbon,as well as wollastonite and *** investigations revealed the use of secondary raw materials like blast furnace slag,fly ash,glass scrap and phosphorous slag as further *** the formation of cuspidine was one major point of interest,the influence of the silica source on its formation was identified.A replacement of wollastonite by blast furnace slag reduced the temperature of the first precipitation of cuspidine by about 100℃;the dissociation of sodium carbonate was lowered by-40℃.The lowest temperature of the first Na2CO3 dissociation could be achieved by using fluorine in combination with blast furnace *** formation from the melt is further decreased if sodium and fluorine are both *** use of glass scrap and phosphorous slag strongly reduced the temperature of first melt formation and enhanced cuspidine formation.

关键词： Mold powder Cuspidine Melting Crystallization behavior

Ethylene and Cytokinin:Partners in Root Growth Regulation

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Molecular Plant 2019年第10期12卷 1312-1314页

作者： christina Artner Eva Benkova Institute of Science and Technology Austria Am Campus 1KlosterneuburgAustria

Ethylene and cytokinin,two plant hormones with essential functions throughout the plant's life cycle,contribute to a wide spectrum of physiological,biochemical,and developmental *** the last decades,the molecular mechanisms underlying their biosynthesis and metabolism as well as pathways mediating their perception and signal transduction have been *** machineries controlling the activities of these two central hormonal regulators appear robust and autonomous,in the ever-changing environmental conditions that plants face,survival is dependent on their tight communication and mutually balanced activities.A recent work by Zdarska et al.(2019)is trying to address the challenging question regarding the mechanisms underlying the cytokinin and ethylene *** study reveals an intriguing,multilayered nature of hormonal interaction,in which the EHYLENE RESISTANT 1(ETR1)receptor upon perceiving an ethylene signal activates a multistep phosphorelay(MSP)cytokinin transduction cascade,integrating ethylene and cytokinin in the control of root apical meristem *** parallel,activation of canonical ethylene signaling adjusts the responsiveness of the cytokinin pathway by transcriptional upregulation of one of its key signaling components,the ARR10 response regulator(Figure 1).Importantly,unlike the canonical ethylene transduction machinery,ethylene input into the MSP is dependent on histidine kinase activity of ETR1 receptor.

关键词： Ethylene Root metabolism

Enhancing China＇s National Image Through Culture Festivals： A Case Study of China Culture Years in Europe

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Fudan Journal of the Humanities and Social Sciences 2014年第1期7卷 33-55页

作者： christina Maags Gmeneburgplatz 1 60323 Frankfurt am Main Germany

Since the mid-2000s, the PRC has increasingly focused on pursuing cultural diplomacy abroad to improve its national image and enhance cultural soft power. Although China＇s cultural ＂Charm Offensive＂ has not gone unnoticed, a variety of specific activities have not been subject to research so far. This paper, therefore, attempts to fill this research gap by analyzing Chinese state-level cultural diplomacy through a comparative case study of three China Culture Year events held in France （2004）, Italy （2010）, and Germany （2012）. These findings are subsequently compared to the China Culture Year in Australia （2012）, thereby allowing the identification of spatial variations. I argue that the Chinese government applies a general approach of organizing the events abroad by making use of local institu- tions. At the same time, through the strategic selection of events, the festivals portray distinct national images that transmit particular narratives of self-presentation to the European audience and take into account country-specific preferences.

关键词： China Europe Cultural diplomacy - Soft power National images China Culture Year

Textures and mineral compositions of the Xinjie layered intrusion,SW China:Implications for the origin of magnetite and fractionation process of Fe-Ti-rich basaltic magmas

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Geoscience Frontiers 2013年第5期4卷 503-515页

作者： Huan Dong Changming Xing christina Yan Wang Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of GeochemistryChinese Academy of Sciences University of Chinese Academy of Sciences

The Xinjie layered intrusion in the Panxi region,SW China,hosts both Fe-Ti oxide and platinum-group element（PGE） sulfide *** intrusion can be divided,from the base upward,into UnitsⅠ,ⅡandⅢ,in terms of mineral ***ⅠandⅡare mainly composed of wehrlite and clino-pyroxenite, whereas UnitⅢis mainly composed of *** sulfide-rich layers mainly occur in Unit I, whereas thick Fe-Ti oxide-rich layers mainly occur in UnitⅢ.An ilmenite-rich layer occurs at the top of UnitⅠ.Fe-Ti oxides include magnetite and *** amounts of cumulus and intercumulus magnetite occur in UnitsⅠandⅡ.Cumulus magnetite grains are commonly euhedral and enclosed within olivine and *** have high Cr2O3 contents ranging from 6.02 to 22.5 wt.%,indicating that they are likely an early crystallized phase from *** magnetite that usually displays ilmenite exsolution occupies the interstices between cumulus olivine crystals and coexists with interstitial clinopyroxene and *** magnetite has Cr2O3 ranging from 1.65 to 6.18 wt.%, lower than cumulus *** intercumulus magnetite may have crystallized from the trapped *** amounts of magnetite in UnitⅢcontains Cr2O3（＆lt;0.28 wt.%） much lower than magnetite in UnitsⅠandⅡ.The magnetite in UnitⅢis proposed to be accumulated from a Fe-Ti-rich *** Fe-Ti-rich melt is estimated to contain 35.9 wt.%of SiO2,26.9 wt.%of FeOt,8.2 wt.%of TiO2,13.2 wt.%of CaO, 8.3 wt.%of MgO,5.5 wt.%of Al2O3 and 1.0 wt.%of *** composition is comparable with the Fe-rich melts in the Skaergaard and Sept Iles *** non-reactive microstructures,granophyre pockets and ilmenite-rich intergrowths,are representative of Si-rich melt and Fe-Ti-rich melt,and are the direct evidence for the existence of an immiscible Fe-Ti-rich melt that formed from an evolved ferro-basaltic magma.

关键词： Geochemistry Fe-Ti oxides Mineral composition The Xinjie layered mafic-ultramafic intrusion Emeishan large igneous province

Climatic niche shift of an invasive shrub (Ulex europaeus): a global scale comparison in native and introduced regions

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Journal of Plant Ecology 2020年第1期13卷 42-50页

作者： Mathias christina Fawziah Limbada Anne Atlan UMR ISPA INRA71 Avenue Edouard Bourlaux33140 Villenave-d’ornonFrance UMR ECOBIO CNRS/UniversitéRennes 1Avenue du Général LeclercCampus de Beaulieu35042 RennesFrance UPR AIDA CIRAD40 Chemin Grand Canal97490 Sainte-ClotildeLa RéunionFrance UMR ESO CNRS/UniversitéRennes 2Place du Recteur Henri Le Moal35043 RennesFrance

Aims Invasive species,which recently expanded,may help understand how climatic niche can shift at the time scale of the current global ***,we address the climatic niche shift of an invasive shrub(common gorse,Ulex europaeus)at the world and regional scales to assess how it could contribute to increasing *** Based on a 28187 occurrences database,we used a combination of 9 species distribution models(SDM)to assess regional climatic niche from both the native range(Western Europe)and the introduced range in different parts of the world(North-West America,South America,North Europe,Australia and New Zealand).Important Findings Despite being restricted to annual mean temperature between 4℃ and 22℃,as well as annual precipitation higher than 300 mm/year,the range of bioclimatic conditions suitable for gorse was very *** on a native versus introduced SDM comparison,we highlighted a niche expansion in North-West America,South America and to a lesser degree in Australia,while a niche displacement was assessed in North *** niche changes induced an increase in potential occupied areas by gorse by 49,111,202 and 283%in Australia,North Europe,North-West America and South America,*** the contrary,we found no evidence of niche change in New Zealand,which presents similar climatic condition to the native environment(Western Europe).This study highlights how niche expansion and displacement of gorse might increase invasibility at regional *** change in gorse niche toward new climatic conditions may result from adaptive plasticity or genetic evolution and may explain why it has such a high level of *** into account the possibility of a niche shift is crucial to improve invasive plants management and control.

关键词： plant invasion invasibility niche shift species distribution models ecological niche

Response of nephelometric turbidity to hydrodynamic particle size of fine suspended sediment

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International Journal of Sediment Research 2020年第5期35卷 444-454页

作者： christina Bright Sarah Mager Sophie Horton School of Geography University of Otago

Turbidity is used as a surrogate for suspended sediment concentration(SSC),and as a regulatory tool for indicating land use disturbance and environmental *** relates linearly to suspended material,however,can show non-linear responses to particulate organic matter(POM),concomitant with changes in particle size distribution(PSD).In the paper the influence of ultra-fine particulate matter(UFPM) on specific turbidity and its association with POM in suspended sediment are shown for alpine rivers in the Southern Alps of New *** approach was two-fold:a field-based investigation of the relations between SSC,POM,and turbidity sampled during event flow;and experimental work on hydrodynamic particle size effects on SSC POM,PSD,and *** turbidity changes over event flow and are sensitive to increasing proportional amounts of sand,UFPM,and POM in ***,the UFPM is the size fraction(<6 μm) where POM *** implications of the current study are that the slopes of turbidity-SSC relations are undesirable in locations that may be dominated by cyclic release of POM or distinct pulses of fine-grained *** locations where the turbidity-SSC slopes approximate 2,the POM proportion is usually <10% of the total suspended ***,when turbidity-SSC slopes are <1 this is likely caused by high amounts of side-scatter from UFPM concomitant with higher proportions of ***,the use of turbidity as a proxy for determining SSC may have serious consequences for the measurement of representative suspended sediment data,particularly in locations where POM may be a significant contributor to overall suspended load.

关键词： Turbidity Nephelometry Suspended sediment concentration Particle size distribution Particulate organic matter

Dysfunctions of the Iga system:a common link between intestinal and renal diseases

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Cellular & Molecular Immunology 2011年第2期8卷 126-134页

作者： christina Papista Laureline Berthelot Renato C Monteiro NSERM U699 Paris 75018France Universite´Paris Diderot Paris 75018France

Immunoglobulin A(Iga)-isotype antibodies play an important role in immunity owing to their structure,glycosylation,localization and receptor *** in this system can lead to multiple types of *** review describes the characteristics of Iga and discusses the involvement of abnormalities in the Iga system on the development of celiac disease and Iga nephropathy.

关键词： celiac disease Iga nephropathy immunoglobulin A receptors

Impacts of COVID-19 on tourism and management response from Banff National Park,Canada

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林业研究:英文版 2023年第5期34卷 1229-1244页

作者： christina Dehui Geng Howie WHarshaw Wanli Wu Guangyu Wang Department of Forest Resources Management Faculty of ForestryUniversity of British ColumbiaVancouverCanada Faculty of Kinesiology Sportand RecreationUniversity of AlbertaEdmontonCanada

The COVID-19 pandemic posed challenges to the tourism sector *** investigated changes in visitor demographics,satisfaction level,and its determinants pre-and *** were collected using questionnaire surveys in 2019 and 2021 within Banff National Park(BNP).The data analyses were based on a sample size of 1183 respondents by conducting factor analysis,correlation analysis and stepwise regression *** highlight that there were fewer international visitors and more local and domestic visitors during the *** attributes were evaluated at a higher satisfaction level *** quality of the Park facilities and services were the most important satisfaction determinants pre-and peri-COVID-19,and all the Park COVID-19 measures and actions received positive experience from *** research fills this knowledge gap by developing a better understanding in the change of visitor demographics and satisfaction level in BNP under the context of the *** also provides implication for both scholars and practitioners to understand the impacts of the pandemic on Park *** study can provide insights for utilizing the pandemic as a transformative strength and for mitigating its negative impact on tourism industry.

关键词： National park COVID-19 pandemic Visitor experience Tourism management Visitor perception

Highly N-doped carbon with low graphitic-N content as anode material for enhanced initial Coulombic efficiency of lithium-ion batteries

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Carbon Energy 2023年第2期5卷 236-249页

作者： Yihua Tang Jingjing Chen Zhiyong Mao christina Roth Dajian Wang Department of Electrochemical Process Engineering Universitat BayreuthBayreuthGermany Chair of Electrochemical Process Engineering Bavarian Center for Battery Technology(BayBatt)BayreuthGermany Tianjin Key Laboratory for Photoelectric Materials and Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjinPR China

N-doped carbons as one of the most prominent anode materials to replace standard graphite exhibit outstanding Li+storage ***,N-doped carbon anodes still suffer from low N-doping levels and low initial Coulombic efficiency(ICE).In this study,high N-doped and low graphitic-N carbons(LGNCs)with enhanced ICE were synthesized by taking advantage of a denitrification strategy for graphitic carbon nitride(g-C_(3)N_(4)).In brief,more than 14.5 at%of N from g-C_(3)N_(4)(55.1 at%N)was retained by reacting graphitic-N with lithium,which was subsequently *** graphitic-N is largely responsible for the irreversible capacity,the anode's performance was significantly *** to general N-doped carbons with high graphitic-N proportion(>50%)and low N content(<15 at%),LGNCs delivered a low proportion of 10.8%-17.2% within the high N-doping content of 14.5-42.7 at%,leading to an enhanced specific capacity of 1499.9mAh g^(-1) at an ICE of 93.7% for the optimal sample of LGNC(4:1).This study provides a facile strategy to control the N content and speciation,achieving both high Li+storage capacity and high ICE,and thus promoting research and application of N-doped carbon materials.

关键词： denitrification graphitic carbon nitride graphitic-N lithium-ion batteries N-doped carbon