Autor: Nakamura, T. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Precise measurement of complex permittivity of materials for telecommunications devices
Autorzy:: Nakamura, T.
Nikawa, Y.
Powiązania:: https://bibliotekanauki.pl/articles/309568.pdf
Data publikacji:: 2001
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: perturbation method
TLM method
cavity resonator
simulation model
temperature dependence of complex permittivity
microwave measurement
Opis:: In order to obtain precise complex permittivity of the dielectric materials obtained from the perturbation method a correction curve is made using the electromagnetic field simulator which applies transmission line modeling (TLM) method. In this experiment, generated microwave power with the frequency of 2.45 GHz is applied to heat dielectric material while measuring temperature dependence of complex permittivity of dielectric material. To obtain these objectives cavity resonator with cooling system is designed. It is found from the result that the accurate temperature dependence of complex permittivity of the materials can be obtained by the method presented here.
Źródło:: Journal of Telecommunications and Information Technology; 2001, 3; 66-71
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Effect of robot utterances using onomatopoeia on collaborative learning
Autorzy:: Jimenez, F.
Kanoh, M.
Yoshikawa, T.
Furuhashi, T.
Nakamura, T.
Powiązania:: https://bibliotekanauki.pl/articles/91733.pdf
Data publikacji:: 2014
Wydawca:: Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:: robot
onomatopoeia
collaborative learning
Opis:: We investigated the effect of robot’s utterances using onomatopoeia in collaborative learning. The robot was designed to provide encouragement using onomatopoeia when students are given problems to be solved issued by a learning system. Eight college students used a mathematics learning system with a robot for three weeks and then took exams. The results indicated that the robot using utterances with onomatopoeia could comfort learners more than the robot without onomatopoeia. It suggests that the robot that praises or comforts using onomatopoeia helps learners maintain their motivation in collaborative learning.
Źródło:: Journal of Artificial Intelligence and Soft Computing Research; 2014, 4, 2; 125-131
2083-2567
2449-6499
Pojawia się w:: Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Micro-Raman Study of $BiFeO_3$ Thin Films Fabricated by Chemical Solution Deposition Using Different Bi/Fe Ratio Precursors
Autorzy:: Nakamura, T.
Fukumura, H.
Hasuike, N.
Harima, H.
Nakamura, Y.
Kisoda, K.
Nakashima, S.
Okuyama, M.
Powiązania:: https://bibliotekanauki.pl/articles/1807821.pdf
Data publikacji:: 2009-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.30.Hv
63.20.D-
78.30.-j
Opis:: $BiFeO_3$ thin films were grown by chemical solution deposition using precursors with different elemental ratios, Bi/Fe = 1.1/1.0, 1.0/1.0 and 1.0/1.1. All the samples consisted of two easily distinguishable components of crystalline and amorphous phases. We have found that the electric properties of $BiFeO_3$ thin films are closely connected to the crystallinity of the films.
Źródło:: Acta Physica Polonica A; 2009, 116, 1; 72-74
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Synthesis and Characterization of Mn-Doped $BiFeO_3$ Nanoparticles
Autorzy:: Fukumura, H.
Matsui, S.
Tonari, N.
Nakamura, T.
Hasuike, N.
Nishio, K.
Isshiki, T.
Harima, H.
Kisoda, K
Powiązania:: https://bibliotekanauki.pl/articles/1807808.pdf
Data publikacji:: 2009-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.30.Hv
63.20.D-
78.30.-j
Opis:: $BiFeO_3$ is a multiferroic material showing antiferromagnetic ordering and ferroelectric behavior simultaneously. Here, Mn-doped $BiFeO_3$ nanoparticles were synthesized up to 10% of Mn composition by a sol-gel process. The samples showed high crystallinity with no secondary phase up to 2% of Mn doping. A phonon peak at 1250 $cm^{-1}$ in undoped $BiFeO_3$ showed anomalous intensity enhancement in the magnetically ordered phase below $T_N$ = 643 K due to a spin-phonon coupling. This behavior was less pronounced in the Mn-doped samples, suggesting a suppression of magnetic ordering between $Fe^{3+}$ spins by Mn doping.
Źródło:: Acta Physica Polonica A; 2009, 116, 1; 47-50
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki