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64篇 您的检索式:作者名="Janne K"
    题名 作者 年代 出处 被引量
1Electronic structure of the SrAl_2O_4:Eu^(2+) persistent luminescence material显示文摘The electronic structure of the strontium aluminate (SrAl2O4:Eu2+) materials was studied with a combined experimental and theoretical approach. The UV-VUV synchrotron radiation was applied in the experimental study while the electronic structure of the non-optimized and optimized crystal structure were investigated theoretically by using the density functional theory. The structure of the va- lence and conduction bands as well as the band gap energy of the material together with the position of the Eu2+ 4f7 8S7/2 ground state were calculated. The calculated band gap energy (6.4 eV) agreed well with the experimental value of 6.6 eV. The valence band consisted mainly of oxygen states whereas the bottom of the conduction band of strontium states. In agreement with the experimental results, the calculated 4f7 8S7/2 ground state of Eu2+ lies in the energy gap of the host. The position of the 4f7 ground state depended on the Coulomb repulsion strength. The position of the 4f7 ground state with respect to the valence and conduction bands was discussed using theoretical and experimental evidence available.Jorma Hls Taneli Laamanen Mika Lastusaari Janne Niittykoski Pavel Novák 2009Journal of Rare Earths2009,27,4:9
2Synchrotron radiation investigations of the Sr_2MgSi_2O_7:Eu^(2+),R^(3+) persistent luminescence materials显示文摘The electronic and defect energy level structure of polycrystalline Sr2MgSi2O7:Eu2+,R3+ persistent luminescence materials were studied with thermoluminescence and different synchrotron radiation spectroscopies (UV-VUV emission and excitation, X-ray absorption near-edge spectroscopy (XANES) and extended X-ray absorption fine structure (EXAFS)). Special attention was paid on the effect of the R3+ co-dopants on the persistent luminescence properties of the materials. Theoretical calculations using the density functional theory (DFT) were carried out simultaneously with the experimental work. The experimental band gap energy (Eg) value of ca. 7.1 eV agreed very well with the DFT value of 6.7 eV. The variation of the Eg value was attempted to relate with the trap structure as well as with the different properties of the R3+ co-dopants. The trap level energy distribution depended strongly on the R3+ co-dopant except for the shallowest trap energy above the room temperature remaining practically the same, however. The different processes in the mechanism of persistent luminescence from Sr2MgSi2O7:Eu2+,R3+ were assembled and their contributions discussed.Tuomas Aitasalo Jukka Hassinen Jorma Hls Taneli Laamanen Mika Lastusaari Marja Malkamki Janne Niittykoski Pavel Novák 2009Journal of Rare Earths2009,27,4:5
3From deception to frankness: Benefits of ontogenetic shift in the anti-predator strategy of alder moth Acronicta alni larvae显示文摘Janne K VALKONEN Ossi NOKELAINEN Marianne JOKIMAKI Elviira KUUSINEN Mirva PALORANTA Maiju PEURA Johanna MAPPES 2014Current Zoology2014,60,1:2
4Theta burst TMS increas- es cerebral blood flow in the primary motor cortex during motor performance as assessed by arterial spin labeling (ASL) 显示文摘Orosz A Jann K Wirth M 2012Neuroimage2012,61,3:1
5Maternal characteristics and lifestyle factors and the risk of delivering high birth weight infants显示文摘Janne O Tine B H Ulrik K 2003Obstetrics& Gynecology2003,102,1:1
6Semantic memory involvement in the default mode network: a functional neuroimaging study using independent component analysis 显示文摘Wirth M Jann K Dierks T 2011Neuroimage2011,54,4:1
7Resetting semiactives tiffness damper for seismic response control 显示文摘Jann N Y Kim J H Anil K A 2000ASCE Journal of Structural Engineering2000,126,14:1
8Optimization of electricity retailer's contract portfolio subject to risk preferences显示文摘Janne K Ahti S Derek W B 2010IEEE Transactions on Power Systems2010,25,1:1
9Isolation, characterization, molecular gene cloning and sequencing of a novel phytase from Bacillus sublilis 显示文摘JANNE K 1998Applied and Environmental Microbiology1998,64,6:1
10Epileptogenic developmental venous anomaly: insights from simultaneous EEG/fMRI显示文摘Scheidegger O Wiest R Jann K 2013Clin EEG Neurosci2013,44,2:1
11Modeling air combat by a moving ho- rizon influence diagram game显示文摘Kai V Janne K Tuomas R 2006Journal of Guidance Control and Dynamics2006,29,5:1
12Comparison of nearest point algorithms by genetic algorithms显示文摘Janne K J 2011Expert Systems with Applications2011,38,10:1
13IL-17 Immunity in Hu- man Type 1 Diabetes显示文摘Jarno H Janne K Gao NR 2010J Immunol2010,185,3:1
14Epileptogenic developmental venous anomaly:insights from simultane- ous EEG/fMRI 显示文摘Scheidegger O Wiest R Jann K 2013Clin EEG Neurosci2013,44,2:1
15Near-optimal missile avoidance traj- ectories via receding horizon control 显示文摘Janne K Kai V Tuomas R 2007Journal of Guidance Control and Dynamics2007,30,5:1
16Alcohol drinking pattern and risk of alcoholic liver cirrhosis: A prospective cohort study显示文摘Gro Askgaard Morten Gr?nb?k Mette S. Kj?r Anne Tj?nneland Janne S. Tolstrup 2015Journal of Hepatology2015,,5:1
17Bacterial lipopolysaccharide extraction with phenol-water and further applications of the procedure显示文摘Westphal O Jann K 1965Methods Carbohydr Chem1965,5,:1
18Phytase Production by High Cell Density Culture of Recombinant Bacillus Subtilis显示文摘 NIKLAS V W JANNE K 2001Biotechnology Letters2001,23,10:1
19Lack of a pharmacokinetic drug-drug interaction with venlafaxine extended-release/indinavir and desvenlafaxine extended-release/indinavir 显示文摘Jann MW Spmtlin V Momary K 2012Euro J Clin Pharmacol2012,68,5:1
20Bacterial lipopolysaccharides:extraction with phenol-water and further applications of the procedure显示文摘Westphal O Jann K 1965Methods in Carbohydrae Chemistry1965,,5:1
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