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Laser ablation(in situ)Lu-Hf dating of magmatic fluorite and hydrothermal fluorite-bearing veins

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Geoscience Frontiers 2023年第6期14卷 142-154页

作者： Stijn Glorie Jacob Mulder Martin Hand adrian Fabris Alexander Simpson Sarah Gilbert Department of Earth Sciences University of AdelaideSA 5005Australia Geological Survey of South Australia Department for Energy and MiningAdelaideSA 5005Australia Adelaide Microscopy University of AdelaideSA 5005Australia

Fluorite(CaF_(2))is a common hydrothermal mineral,which precipitates from fluorine-rich fluids with an exceptional capacity to transport metals and Rare Earth Elements(REEs).Hence,the ability to date fluorite has important implications for understanding the timing of metal transport in hydrothermal *** we present,for the first time,fluorite Lu-Hf dates from fluorite-carbonate veins from the Olympic Cu-Au Province in South *** fluorite dates were obtained in situ using the recently developed LA-ICP-MS/MS Lu-Hf dating method.A fluorite-calcite age of 1588±19 Ma was obtained for the Torrens Dam prospect,consistent with the timing of the formation of the nearby Olympic Dam iron-oxide copper gold Breccia *** in the overlying Neoproterozoic successions were dated at 502±14 Ma,indicating a temporal link between Cu-sulphide remobilisation and the Delamerian ***,we present a multi-session reproducible date for magmatic fluorite from a monzogranite in the Pilbara Craton(Lu-Hf age of 2866±19 Ma).This age is consistent with a garnet Lu-Hf age from the same sample(2850±12 Ma)and holds potential to be developed into a secondary reference material for future fluorite Lu-Hf dating.

关键词： Reaction-cell ICP-MS In-situ geochronology Fluorite-calcite veins Iron oxide copper-gold Critical mineral exploration Rare Earth Elements

Development of an analytical method based on solid-phase extraction and LC-MS/MS for the monitoring of current-use pesticides and their metabolites in human urine

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Journal of Environmental Sciences 2022年第1期34卷 153-163页

作者： Beibei Gao Giulia Poma Govindan Malarvannan Catalina Dumitrascu Michiel Bastiaensen Minghua Wang adrian Covaci Toxicological Centre University of AntwerpWilrijk 2610Belgium Department of Pesticide Science College of Plant ProtectionState and Local Joint Engineering Research Center of Green Pesticide Invention and ApplicationNanjing Agricultural UniversityNanjing 210095China

Pyrethroids,organophosphorus pesticides and fipronil have been listed as priority chemicals in human biomonitoring studies because of their wide use and potential health effects in *** determination of 13 pesticides,including pyrethroids(deltamethrin,cypermethrin,permethrin,cyfluthrin,bifenthrin),organophosphorus(chlorpyrifos,chlorpyrifosmethyl,and malathion),fipronil,neonicotinoids(imidacloprid,acetamiprid and thiacloprid)and triazole(prothioconazole),together with 13 corresponding metabolites in human urine samples was achieved by solid-phase extraction and analysis by liquid chromatography coupled to tandem mass *** targeted compounds,except malathion dicarboxylic acid,were measured with a mean within-accuracy(n=5)of 71%–114%(RSD:1%–14%)and between-run(n=15)accuracy of 80%–118%(RSD:2%–14%).Limits of quantitation of the targeted analytes ranged from 0.1 to 16 pg/m *** detection result of urine samples from 25 volunteers indicated that the detection frequencies of 3,5,6-trichloro-2-pyridinol(median:448 pg/m L),6-chloropyridine-3-carboxylic acid(median:193 pg/m L),2-methyl-3-phenylbenzoic acid(median:181 pg/m L),3-phenoxybenzoic acid(median:99 pg/m L),2-isopropyl-6-methyl-4-pyrimidinol(median:77 pg/m L),cyfluthrin(median:59 pg/m L),cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid(cis-DCCA,median:53 pg/m L),trans-DCCA(median:25 pg/m L),prothioconazole(median:21 pg/m L),imidacloprid(median:7 pg/m L),and prothioconazole-desthio(median:1 pg/m L)were>50%.The obtained results show that the validated method is suitable for the human biomonitoring of these currentuse pesticides and their metabolites.

关键词： Pyrethroids Organophosphorus Fipronil Neonicotinoids Urine Biomonitoring

Encapsulated peracetic acid as a valid broad‑spectrum antimicrobial alternative,leading to beneficial microbiota compositional changes and enhanced performance in broiler chickens

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畜牧与生物技术杂志:英文版 2023年第5期14卷 2128-2142页

作者： Salvatore Galgano Leah Conway Nikki Dalby adrian Fellows Jos G.MHoudijk Monogastric Science Research Centre Scotland’s Rural CollegeWest Mains RoadEdinburgh EH93JGScotlandUK Aga2tech Ltd HalifaxUK Centre for Innovation Excellence in Livestock YorkUK

Background Antimicrobial alternatives are urgently needed,including for poultry production *** this study,we tested the potential broad-range antimicrobial alternative peracetic acid,delivered in feed via the hydrolysis of encapsulated precursors through a 28-day study using 375 Ross 308 broiler *** tested two peracetic acid concentrations,30 and 80 mg/kg on birds housed on re-used litter,and we evaluated the impact of both levels on gut microbial communities,bacterial concentration,antimicrobial resistance genes relative abundance and growth performance when compared to control birds housed on either clean or re-used *** Body weight gain and feed conversion ratio improved in peracetic acid fed *** d 28,birds given 30 mg/kg of peracetic acid had a decreased Firmicutes and an increased Proteobacteria abundance in the jejunum,accompanied by an increase in Bacillus,Flavonifractor and Rombustia in the caeca,and a decreased abundance of tetracycline resistance *** given 80 mg/kg of peracetic acid had greater caecal abundance of macrolides lincosamides and streptogramins resistance *** performance on clean litter was reduced compared to reused litter,which concurred with increased caecal abundance of Blautia,decreased caecal abundance of Escherichia/Shigella,Anaerostipes and Jeotgalicoccus,and greater gene abundance of vancomycin,tetracycline,and macrolides resistance *** Peracetic acid could be used as a safe broad-spectrum antimicrobial alternative in *** precursors were able to reduce the bacterial concentration in the jejunum whilst promoting the proliferation of probiotic genera in the caeca,especially at the low peracetic acid concentrations tested,and improve growth ***,our findings offer further insights on potential benefits of rearing birds on re-used litter,suggesting that the latter could be associated with better performance and reduced antimicrobial resistance

关键词： Antimicrobial alternative Antimicrobial resistance Broiler chicken Microbiota Peracetic acid Performance 16S rRNA gene

Measurement and Modeling for Magnetic Properties of Amorphous Alloy Material

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Measurement and Modeling for Magnetic Properties of Amorphou...

作者： Lukas adrian Karim 厦门理工学院

学位级别：硕士

非晶态金属也称为金属玻璃或玻璃金属,是一种固体金属材料,通常是合金,具有无序的原子尺度结构。大多数金属在固态状态下都是结晶的,这意味着它们有高度有序的原子排列。非晶态合金目前最重要的应用是在工频和一些高频变压器、高效率、... 详细信息

非晶态金属也称为金属玻璃或玻璃金属,是一种固体金属材料,通常是合金,具有无序的原子尺度结构。大多数金属在固态状态下都是结晶的,这意味着它们有高度有序的原子排列。非晶态合金目前最重要的应用是在工频和一些高频变压器、高效率、低磁化损耗的变压器中。非晶态合金材料因其技术应用前景广阔而受到人们的关注。本文采用二维单片测试仪和数据采集装置,测量了一维交变和二维旋转磁场中磁通密度B与磁场强度H的关系。提出了一种测量非晶合金材料中磁通量和磁场强度分量的方法。本文在50赫兹频率的不同外加磁场激励下,对非晶合金样品的B和H进行了测量。通过对测量结果的对比分析发现:在低通量密度(0.35 T)下的测量中,Bx-Hx和ByHy磁滞回线的形状几乎相同,在增加励磁电流后,两个方向的磁滞行为发生了变化。在测量磁通密度达到0.88 T时,这种现象更加明显,直到在y方向的磁通密度达到1.85T和X方向1.73 T,材料达到磁饱和值。本文采用Jiles-Atherton磁滞模型模拟了非晶态合金的磁滞特性。主要工作涉及用交变磁场模拟磁滞特性并与交变磁场测量B-H结果进行对比。仿真结果表明,JilesAtherton模型具有足够的精度,可以模拟该材料的一维磁滞特性。

关键词：非晶合金材料二维磁性磁通密度磁场 B-H测量和磁滞回线

Pitfalls of acid leaching method for determining organic and inorganic carbon contents in marine sediments

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Acta Oceanologica Sinica 2020年第8期39卷 96-102页

作者： Chen Ling Zhifei Liu Jingwen Zhang Yulong Zhao Yanwei Zhang adrian RFernandez State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China

Organic and inorganic carbon contents of marine sediments are important to reconstruct marine productivity,global carbon cycle, and climate change. A proper method to separate and determine organic and inorganic carbons is thus of great necessity. Although the best method is still disputable, the acid leaching method is widely used in many laboratories because of its ease-of-use and high accuracy. The results of the elemental analysis of sediment trap samples reveal that organic and inorganic carbon contents cannot be obtained using the acid leaching method, causing an infinitely amplified error when the carbon content of the decarbonated sample is 12%±1% according to a mathematical derivation. Acid fumigation and gasometric methods are used for comparison, which indicates that other methods can avoid this problem in organic carbon analysis. For the first time, this study uncovers the pitfalls of the acid leaching method, which limits the implication in practical laboratory measurement, and recommends alternative solutions of organic/inorganic carbon determination in marine sediments.

关键词： marine sediments organic carbon inorganic carbon acid leaching method limitation

New Dimensions for a Challenging Security Environment:Growing Exposure to Critical Space Infrastructure Disruption Risk

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International Journal of Disaster Risk Science 2018年第4期9卷 555-560页

作者： adrian V.Gheorghe Alexandru Georgescu Olga Bucovetchi Marilena Lazar Cezar Scarlat Department of Engineering Management and Systems Engineering Old Dominion UniversityNorfolkVA 23529USA Romanian Association for Space Technology and Industry(ROMSPACE) 061126 BucharestRomania University Politehnica of Bucharest 060042 BucharestRomania Military Equipment and Technologies Research Agency of the Romanian Ministry of Defense(METRA) 077025 ClinceniIlfov CountyRomania

Space systems have become a key enabler for a wide variety of applications that are vital to the functioning of advanced societies. The trend is one of quantitative and qualitative increase of this dependence, so much so that space systems have been described as a new example of critical infrastructure. This article argues that the existence of critical space infrastructures implies the emergence of a new category of disasters related to disruption risks. We inventory those risks and make policy recommendations for what is, ultimately, a resilience governance issue.

关键词： Complex systems Infrastructure disruption Resilience governance Space infrastructure System interdependencies

Cloud economy and its relationship with China’s economy—a capital market-based approach

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Financial Innovation 2022年第1期8卷 1001-1022页

作者： Lichao Lin adrian Cheung Wai Kong Faculty of Finance City University of MacaoTaipaMacaoChina

Through the lens of the stock market,we examine whether and how the cloud economy affects China’s *** review the literature on cloud computing and related concepts and propose a definition of the cloud *** on this new definition,we create a China Cloud Economy Index(CCEI)and its *** stock market data from 2012 to 2020,we analyze the basic characteristics of these indices,their validity,and their relationship with the overall stock *** robustness of the new index is also *** find that the relationship between the CCEI and the stock market had been getting stronger but weakened somewhat after January 11,2019 plausibly because of the availability of recent cloud-related policies that have widened the gap between the market performance of CCEI and that of the stock market.

关键词： market indices economy

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新天鹅护理休闲区,本特利,澳大利亚

世界建筑 2024年第6期 66-71页

作者：无 adrian Iredale Finn Pedersen Martyn Hook Tom See Hoo Rebecca Angus Mary McAree Rebecca Hawkett Catherine Dupuy Gian Tonossi Jordan Blagaich Jake Gethin Daniel Martin Peter Bennetts(摄影) 伊代尔-佩德森-霍克建筑事务所不详

新天鹅护理休闲区旨在通过减少隔离、鼓励安全的活动和社交互动来改善居民的健康和福祉,并欢迎朋友、家人和周边居民的到来。Iph建筑事务所挑战了之前的总体规划,将车辆和道路从中心空间移除,取而代之的是一条宽阔、笔直且清静的人行林... 详细信息

新天鹅护理休闲区旨在通过减少隔离、鼓励安全的活动和社交互动来改善居民的健康和福祉,并欢迎朋友、家人和周边居民的到来。Iph建筑事务所挑战了之前的总体规划,将车辆和道路从中心空间移除,取而代之的是一条宽阔、笔直且清静的人行林荫道。林荫大道从天鹅护理中心的主要入口街道(阿迪苑)延伸至新的休闲区,并继续通向到远处的老年人关怀设施。一条蜿蜒曲折的小路与林荫大道相接,方便人们慢步闲逛。随着总体规划逐渐深化,这些小路将继续延伸,为老年痴呆症患者提供安全的活动空间。

关键词：护理中心建筑事务所主要入口林荫大道本特利休闲区蜿蜒曲折林荫道

Diversity of endophytes across the soil-plant continuum for Atriplex spp. in arid environments

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Journal of Arid Land 2016年第2期8卷 241-253页

作者： Mohammad E TAHTAMOUNI Sa'eb KHRESAT Mary LUCERO Jesus SIGALA adrian UNC New Mexico State University Department of Plant & Environmental Sciences Las Cruces NM 88003 USA Jordan University of Science and Technology Department of Natural Resources and Environment Irbid 22110 Jordan Seco Spice Chamberino NM 88027 USA Boreal Ecosystems Research Initiative Memorial University of Newfoundland Corner Brook A2H 5G4 Canada University of Leeds School of Geography Leeds LS2 9JT UK

Endophytes are hypothesized to be transferred across the soil-plant continuum, suggesting both the transfers of endophytes from environment to plant and from plant to soil. To verify this hypothesis and to assess the role of locality, we evaluated the similarity of microbial communities commonly found both in soils and endophytic communities in three arid regions, i.e. the Jornada LTER （Long Term Ecological Research） site in New Mexico, USA, and the research station of Jordan University of Science and Technology （JUST） and Khanasd research station in Badia region of Jordan. Rhizosphere and non-rhizosphere soils, leaves and seeds of Atriplex spp. were sampled. Diversity and distribution of bacteria and fungi across the soil-plant continuums were assessed by tag-encoded FLX amplicon pyrosequencing and sequence alignment. Of the total bacterial OTUs （operational taxonomic units）, 0.17% in Khanasri research station, 0.16% in research station of JUST, and 0.42% in Jornada LTER site were commonly found across all the plant and soil compartments. The same was true for fungi in two regions, i.e. 1.56% in research station of JUST and 0.86% in Jornada LTER site. However, in Khanasri research station, 12.08% of total fungi OTUs were found in at least one soil compartment and one plant compartment. Putative Arthrobacter, Sporosarcina, Cladosporium and members of Proteobacteria and Actinobacteria were found across all the soil-plant continuums. Ascomycota, mainly including Didymellaceae, Pleosporaceae and Davidiellaceae were present across all the soil-plant continuums. Microbial communities in two regions of Jordan were similar to each other, but both of them were different from the Jornada LTER site of USA. SIMPER （similarity percentage） analysis of bacterial and fungal taxa for both soil and endophyte communities revealed that dissimilarities of two bacterial genera （Arthrobacter and Sporosarcina） and two fungal genera （Cladosporium and Alternaria） are very high, so they play

关键词： endophytes microbial diversities soil-plant continuum pyrosequencing Atriplex spp.