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Modelling of Intrinsic Defects in CaYAl₃O₇

100%
da C. Bispo G., Jackson R., Valerio M.
Acta Physica Polonica A
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2018
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vol. 133
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issue 4
781-784
EN
CaYAl₃O₇ presents a challenge for computer modelling techniques because of its site-occupancy disorder related to the Ca/Y shared site. Supercells were built to reproduce experimental results which have the best agreement and lowest lattice energy. The potential parameters were obtained by empirical fitting, and reproduced the structure to within 1.09%. Results obtained by supercell and the Mott-Littleton methods were compared. Both methods predict oxygen Frenkel defects are likely to be formed.
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Apparatus for studying behavior and learning in restrained rats

100%
Soltysik S., Jackson R., Jelen P.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 3
697-701
EN
A new treadmill/stand apparatus for a rat is described.It will be usefull in behavioral experiments when control of the animal's position in the training chamber is required while considerable freedom of movement, including locomotion, is desired.The position and distance relative to sources of stimuli are thus kept constant.The speed and the distance of ambulation are easily monitored.The rats are sufficiently restrained to enable easy recording of various measures such as EKG, EMG or EEG, etc.Classical and instrumental conditioning procedures are easily implemented.An example of the data from acquisition training during Pavlovian conditioning is shown.
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