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Transactions of Nonferrous Metals Society of China 2010年第8期20卷 1488-1493页

作者：雷良奇宋慈安谢襄漓李艳红王飞 School of Earth science Guilin University of Technology Key Laboratory of geological Engineering centre of Guangxi Province Guilin University of Technology

The issues of acid mine drainage （AMD） and heavy metals contamination in the metal sulfide mine in the add district were explored, through studying the acidification and the heavy metals distribution and evolution of groundwater in the black swan （BS） nickel sulfide mine （Western Australia）. The groundwater samples were collected from the drilling holes situated in the vicinity of tailings storage facility （TSF） and in the background of the mine （away from TSF）, respectively, and the pH and electric conductivity （Ec） were measured in site and the metal contents were analysed by ICP-MS and ICP-AES, quarterly in one hydrological year. The results disclose that the TSF groundwater is remarkably acidified （.pHmean=5, pHmin=3）, and the average contents of heavy metals （Co, Cu, Zn, Cd） and Al, Mn are of 1-2 orders of magnitude higher in TSF groundwater than in background groundwater. It may be due to the percolation of tailings waste water from miU process, which leads the tailings to oxidize and the deep groundwater to acidify and contaminate with heavy metals. Besides, the heavy metals concentration in groundwater may be controlled by pH mainly.

关键词： nickel ore tailings acid mine drainage heavy metals groundwater contamination

Synthesis,microstructure,mechanical properties and luminescence of a ceramics Gd(Nb_(x)Ta_(1-x))O_(4)

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Journal of Advanced Dielectrics 2020年第1期10卷 93-99页

作者： O.B.Shcherbina S.M.Masloboeva N.I.Steblevskaya M.V.Belobeletskaya V.V.Efremov M.V.Smirnov M.N.Palatniko Tananaev institute of Chemistry-Subdivision of the Federal Research centre“kola science centre of the Russian Academy of sciences Russia institute of Chemistry Far East Branch of the Russian Academy of SciencesRussia

Ceramic solid solutions GdNb_(x)Ta_(1-x)O_(4)(x=0-1)were synthesized by *** particularities of microstructure were studied,strength characteristics(Young’s modulus)and stress intensity factor for mode I K_(IC)were *** latter is a criterion of crack resistance of the *** properties of solid solutions GdNb_(x)Ta_(1-x)O_(4)were researched under UV exciting radiation.A comparatively small addition of Ta(x=0.9)was shown to increase luminescence intensities of centers Nb^(4+)-O^(-).An addition of Ta to GdNbO_(4)leads to creation of solid solution GdNb_(0.9)Ta_(0.1)O_(4).Intensity of these centers is 3-6.5 times larger than that of GdNbO_(4)and GdTaO_(4).

关键词： Ceramics luminescence solid solutions microstructure

Optoelectronic and electrochemical behaviour of γ-CuI thin films prepared by solid iodination process

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Progress in Natural science:Materials International 2019年第5期29卷 533-540页

作者： Karthik Kumar Chinnakutti Vengatesh Panneerselvam Durai Govindarajan Ajith kumar Soman Kuppusami Parasuraman Shyju Thankaraj Salammal centre of Excellence for Energy Research Sathyabama Institute of Science and Technology centre for Nanoscience and Nanotechnology Sathyabama Institute of Science and Technology

A simple and efficient solid iodination method has been proposed for the fabrication of p-type γ-CuI thin *** structural,morphological,optical,electrical and electrochemical properties have been investigated in order to serve as an effective hole-transporting layer in solid-state solar *** fabricated films exhibited p-type conductivity with resistivity of 7.0×10;Ωcm,the hole concentration of ～1.13×10;cm;and the mobility of 18.34 cm;V;s;.The cyclic voltammetry result shows a maximum specific capacitance of 43 mF/cm;at a scan rate of 10 mV/*** cyclic stability and capacitance retention were found to be 99.7%.These findings demonstrate that γ-CuI film can be a potential candidate for multiple applications,such as a hole transporting material for solid-state solar cells and electrochemical supercapacitor.

关键词： Copper iodide Solid iodination Hole mobility Cyclic voltammetry

Decline and fall of aging astrocytes:the human perspective

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Neural Regeneration Research 2025年第6期20卷 1713-1714页

作者： Alexei Verkhratsky Alexey Semyanov Faculty of Biology Medicine and HealthThe University of ManchesterManchesterUK Department of Neurosciences University of the Basque Country UPV/EHU and CIBERNEDLeioaSpain Department of Forensic Analytical Toxicology School of Forensic MedicineChina Medical UniversityShenyangLiaoning ProvinceChina Department of Stem Cell Biology State Research Institute Centre for Innovative MedicineVilniusLithuania International Collaborative Center on Big science Plan for Purinergic Signalling Chengdu University of Traditional Chinese MedicineChengduSichuan ProvinceChina Department of Physiology Jiaxing University College of MedicineJiaxingZhejiang ProvinceChina

“Last scene of all that ends this strange,eventful history,is second childishness and mere oblivion.I am sans teeth,sans eyes,sans taste,sans everything.”William Shakespeare‘As You Like It'Act 2,Sc.7,l.139Aging of the human brain is characterized by a progressive decline of its functional capacity;this decline however varies widely,and cognitive longevity differs substantially between individuals.

关键词： aging teeth progressive

Carburization of ferrochromium metals in chromium ore fines containing coal during voluminal reduction by microwave heating

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Journal of Central South University 2009年第1期16卷 43-48页

作者：陈津赵晶张猛晏泓周剑雄 College of Materials science and Engineering Taiyuan University of Technology institute of Mineral Resource Chinese Academy of Geological Science

Chromium ore fines containing coal (COFCC) can be rapidly heated by microwave to conduct the voluminal reduction, which lays a foundation of getting sponge ferrochromium powders with a lower content of C. Under the conditions of COFCC with n(O)-n(C) (molar ratio) as 1.00-0.84 and n(SiO2)-n(CaO) as 1.00-0.39, the samples were heated by 10 kW microwave power to reach the given temperatures and held for different times respectively. The results show that the low-C-Cr ferrochromium metal phase in the reduced materials forms before the high-C-Cr ferrochromium metal phase does. With increasing temperature the C content of ferrochromium metals is in a positive correlation with the content of Cr. The C content of ferrochromium metal in reduced materials is 0-10.07% with an average value of 4.68%. With the increase of holding time the Cr content in ferrochromium metals is in a negative correlation with the content of C, while the content of Fe changes in the contrary way. In the microwave field the kinetic conditions of carburization are closely related with the temperature of microwave heating, holding time and carbon fitting ratio.

关键词： chromium ore fines containing coal (COFCC) ferrochromium metal microwave heating voluminal reduction carburization

Separation and purification of tantalum from plumbomicrolite of amazonite deposit in kola Peninsula by acid leaching and solvent extraction

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Journal of Central South University 2021年第1期28卷 72-88页

作者： S M MASLOBOEVA L G ARUTYUNYAN M N PALATNIKOV D V MANUKOVSKAYA Tananaev institute of Chemistry–Subdivision of the Federal Research centre Kola Science Centre of the Russian Academy of SciencesApatity 184209Russia

A plumbomicrolite concentrate(PMC)was leached with the mixture of HF and H2SO4,HF and HNO3 acids,*** conditions ensuring high recovery of tantalum and niobium(up to 99%)into solution,and radionuclides into insoluble residue were ***-sulfuric acid and fluoride-nitric acid schemes were proposed for PMC leaching by an extractive separation of tantalum form niobium,lead and impurities,and production of high-purity tantalum ***-1 was used as an *** conditions for production of high-purity tantalum strip solutions were defined for all stages(extraction-scrubbing-stripping).Produced tantalum compounds,such as tantalum pentoxide and potassium heptafluotanthalate,comply with the norms for high-purity substances in terms of impurities *** choice of the PMC processing scheme is determined by its profitability.

关键词： mineral plumbomicrolite tantalum niobium acid leaching radioactivity solvent extraction

Pole to Equator Temperature Gradient for Coniacian Time,Late Cretaceous:Oxygen and Carbon Isotopic Data on the Koryak Upland and Hokkaido

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Journal of Earth science 2012年第1期23卷 19-32页

作者： Yuri D Zakharov Olga P Smyshlyaeva Alexander M Popov Tatiana A Velivetskaya Tamara B Afanasyeva Kazushige Tanabe Yasunari Shigeta Haruyoshi Maeda Far Eastern geological institute Russian Academy of Sciences Far Eastern Branch geological institute University of Tokyo Department of Geology National Museum of Nature and Science Department of Earth and Planetary sciences Graduate School of Science

The purpose of this study was to estimate the Coniacian latitudinal thermal gradient in the Northern Hemisphere. Both hemipelagic （ammonoids） and benthic （brachiopods and bivalves） δ18O and δ^13C records were used. They originated from Coniacian shallow-water sequences across a wide range of paleolatitudes, from the Koryak upland （northern Kamchatka, Russian Far East） in the north, to Hokkaido （Japan） in the south. Among Coniacian ammonoids, both migrants from Hokkaido living in high latitudes （Kamchatka） and endemic forms dwelling in middle-low latitudes （Hokkaido） indicate seemingly close optimal growth temperatures. Nevertheless, certain differences in climatic conditions, prevailing during high-latitude coldest seasons, undoubtedly provoked growth cessation in some groups of ammonites. Our isotopic study suggests latitudinal temperature changes of only 0.12 ℃ per degree of latitude for the Northern Hemisphere in Coniacian times, while the average annual temperature in North Kamchatka seems about 3.3 ℃ lower than that in Hokkaido.

关键词： Coniacian oxygen and carbonisotope paleotemperature Kamchatka Hok-kaido.

SHRIMP Zircon U-Pb Ages of the Manketouebo Formation in the Southern Manzhouli Area,Northeast China

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Acta Geologica Sinica(English Edition) 2019年第2期93卷 487-488页

作者： MI Kuifeng CHENG Shaobo ZHAO Shengjin Development and Research centre China Geological Survey School of Earth sciences and Resources China University of Geosciences China Deep Exploration Center-SinoProbe Center Chinese Academy of Geological Science No.10 institute of geological Exploration Inner Mongolia Bureau of Geology and Mineral Resources

Objective The Great Xing’an Range is located in the eastern Central Asian Orogenic Belt and contains a Mesozoic volcanic belt that crops out over an area of 100, 000 km^2,dominating the Mesozoic stratigraphy of the G... 详细信息

关键词： Pb Th Ages Manketouebo Formation

SHRIMP zircon U-Pb age and Nd isotopic study on the Nyainqêntanglha Group in Tibet

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science China Earth sciences 2005年第9期48卷 1377-1386页

作者： HU Daogong1, WU Zhenhan1, JIANG Wan1, SHI Yuruo2, YE Peisheng1 & LIU Qisheng1 1. institute of Geomechanics, Chinese Academy of geological sciences, Beijing 100081, China 2. institute of Geology, Chinese Academy of geological sciences, Beijing SHRIMP centre, Beijing 100037, China 1. institute of Geomechanics Chinese Academy of Geological Sciences 100081 Beijing China 2. institute of Geology Chinese Academy of Geological Sciences Beijing SHRIMP Centre 100037 Beijing China

The Nyainqêntanglha Group is traditionally viewed as the oldest metamorphic basement in the Lhasa block, but its formation age and tectonic setting remain debate. Zircons extracted from the metamorphic sequence of volcanics and intrusions of the Nyainqêntanglha Group, 10 km west of Nam Co in northern Lhasa block, have been investigated by cathodolu- minescence (CL), backscattered (BSE) and dated by ion microprobe (SHRIMP). We conclude that the U-Pb age of 787±9 Ma of zircons from the trondhjemite imposes a constraint on maxi- mum protolith age, and minimum formation age of the Nyainqêntanglha Group is constrained by U-Pb age of 748±8 Ma of zircons from the granite. The formation age of the Nyainqêntanglha Group is consistent with sedimentary age of Greater Himalayan rocks, showing that they devel- oped coevally in an arc-basin tectonic setting of Neoproterozoic active continental margin along the northern margin of the India shield. The inherited zircons from the tholetiite and granite give older 207Pb/206Pb ages from 947 to 1766 Ma. The positive εNd( t ) value indicates that the mafic rocks were derived from the depleted mantle, but contaminated by the older continental crustal material. Integrated Nd model age and U-Pb age data provide excellent evidence for the exis- tence of Mesoproterozoic basement in the Lhasa block during Neoproterozoic time.

关键词： Nyainqêntanglha Group, SHRIMP dating, Nd isotope, Neoproterozoic, Tibet.

Porphyry Cu deposits linked to episodic growth of an underlying parental magma chamber

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science China Earth sciences 2020年第11期63卷 1807-1816页

作者： Yuanchuan ZHENG Lu WANG Chuandong XUE Bo XU Abdul GHAFFAR Zhusen YANG Yongjun LU Limin ZHOU William L.GRIFFIN Zengqian HOU State Key Laboratory of geological Processes and Mineral Resources and School of Earth Science and ResourcesChina University of GeosciencesBeijing 100083China ARC centre of Excellence for Core to Crust Fluid Systems(CCFS)-GEMOC Macquarie UniversityNew South Wales 2109Australia Department of Earth sciences Kunming University of Science and TechnologyKunming 650093China institute of Mineral Resources Chinese Academy of Geological SciencesBeijing 100037China geological Survey of Western Australia East Perth 6004Australia centre for Exploration Targeting and Australian Research Council centre of Excellence for Core to Crust Fluid Systems(CCFS) School of Earth Sciencesthe University of Western AustraliaCrawley 6009Australia National Research centre for Geoanalysis Chinese Academy of Geological SciencesBeijing 100037China institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

Saindak is one of the typical porphyry Cu deposits(PCDs)in the Chagai magmatic arc in ***-forming porphyries at Saindak PCD are mainly composed of ***,we use geochemistry of apatite enclosed in plagioclase phenocrysts from the ore-forming tonalite to constrain the releasing and recharging processes of S and Cl in the underlying parental magma chamber during PCD *** apatite inclusions have homogeneous intra-grain S and Cl compositions,there is significant inter-grain S and Cl variations in apatite inclusions located from core to rim in the hosting *** inter-grain S and Cl variation in apatites are coupled with the core-to-rim trends of An,FeO and Mg contents of the hosting plagioclase *** indicates that the Saindak PCD likely formed by episodic injection of primitive magmas during the growth of an underlying magma chamber,rather than by one major injection or by addition of mafic melt derived from different source *** primitive melt injection introduced essential ore-forming materials such as S and Cl,which were rapidly and effectively released to the coexisting fluids,causing *** primitive melt injection stops,signaling the end of growth of underlying magma chamber,mineralization will cease quickly although the hydrothermal system can still survive for a long ***,the later released fluids are relatively depleted in ore-forming materials,and thus have lower capability to generate ***,predominant porphyry-type mineralizations occurred during the growth rather than waning stage of a magmatic system.

关键词： Apatite Plagioclase Episodic injection Parental magma chamber Porphyry Cu deposit