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Luminescence properties of calcium tungstate activated by lanthanide(Ⅲ) ions

journal of Rare Earths 2014年第3期32卷 221-225页

作者： Z.Piskula j.czajka K.Staninski S.Lis Faculty of Chemistry Adam Mickiewicz University Faculty of Chemical Technology and Engineering University of Technology and Life Sciences in Bydgoszcz

Calcium tungstate phosphors activated by the Ln3＋ ions （Ln-Pr, Nd, Tb, Yb） were synthesized by a traditional high-temperature solid-state method. The crystal structures and morphologies of the products were characterized by scanning electron microscopy （SEM）, X-ray powders diffraction （XRD） and infrared spectra （FT-1R）. The samples were fotmd to show luminescence properties （down-conversion, DC, at excitation wavelength 254 nm and up-conversion, UC, at excitation wavelength 980 nm）. CaWO4 doped with Tb3＋/yb3＋ showed green DC and UC luminescence characteristic of Tb（Ⅲ） ion in the range of 470-660 nm, cor- responding to the 5D4→7F6,5,4,3,2 electronic transition. CaWO4 doped with Pr3＋/Yb3＋ showed week blue, green and red （DC and UC） luminescence of Pr（Ⅲ） ion, in the wavelength region of 450-700 nm. Emission peaks were ascribed to the 3P1→3H4,5,6, 3P0→3H4,5,6, 3P1→3F2 and 3P0→3F2 transitions, respectively. CaWO4 doped with Nd3＋/yb3＋ phosphor emitted orange UC luminescence at 450-690 nm （2p3/2→4I15/2, 4G7/2→419/2,11/2,13/2） and strong near-infrared UC luminescence at 720-900 nm （4F7/2＋4S3/2→4419/2, 4F5/2＋2H3/2→419/2, 4F3/2→4I9/2） which is the characteristic of Nd（Ⅲ） ion.

关键词： lanthanides calcium tungstate up-conversion luminescence rare earths

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Autumn migration of Ospreys from two distinct populations in Poland reveals partial migratory divide

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Avian Research 2021年第4期12卷 442-451页

作者： Dariusz Anderwald Łukasz czajka Sławomir Rubacha Michal Zygmunt Pawel Mirski Forest Experimental Station in Rogów Akademicka 2095-063 RogówPoland Eagle Conservation Committee Niepodległości 53/5510-044 OlsztynPoland Faculty of Biology University of BiałystokCiołkowskiego 1J15-245 BiałystokPoland.

Background:Long-term ringing and telemetry studies show that the Osprey(Pandion haliaetus)is a broad-front migrant following different migratory flyways,depending on the geographical location of their breeding *** have investigated two distinct and declining populations of Osprey in Poland,separated by only a few hundred kilometres,and hypothesised they may exhibit two different migration *** followed mortality causes,comparing them between migration and stationary phases of annual cycle,as well as between two distinct ***:Nineteen Ospreys,both juveniles and adults,were equipped with GPS loggers in 2017-2020 in two populations in western and eastern Poland and followed on their autumn *** calculated the distance they covered on the migration,number of stopover days,migration duration,daily distances covered and departure dates to compare them between age and sex classes and between the eastern and western ***:Ospreys from the western and eastern populations showed a partial migratory *** the first migrated through a western flyway,the second followed a central flyway,resulting in crossing the Mediterranean Sea in distant passes that affected the distance *** mortality reached at least 67%in juveniles and at least 57%in ***:We showed that two distinct Osprey populations in Poland revealed a partial migratory divide,with one covering greater distances over sea and deserts over the central *** might affect individual survival rates and contribute to a steeper decline in one of the *** order for this to be confirmed,more individuals still have to be followed.

关键词： GPS telemetry Mortality Pandion haliaetus Stopover

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不伴有视网膜静脉阻塞的猪眼作放射状视神经切开

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美国医学会眼科杂志（中文版） 2005年第2期17卷 124-124页

作者： Marcin P. czajka Thomas j. Cummings Brooks W. McCuen H Cynthia A. Toth Hoang Nguyen Sharon Fekrat 陆遥（译）

目的：证实猪眼在放射状视神经切开（RON）后无静脉阻塞发生时的组织病理学改变。

关键词：视网膜静脉阻塞视神经放射状切开组织病理学改变猪

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