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1
Content available Precise measurement of complex permittivity of materials for telecommunications devices
100%
Nakamura T. , Nikawa Y.
Journal of Telecommunications and Information Technology
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2001
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tom nr 3
66-71
EN
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.
2
Content available remote Measurement of Vector Hysteretic Property of Silicon Steel Sheets at Liquid Nitrogen Temperature
80%
Miyamoto M. , Matsuo T. , Nakamura T.
Przegląd Elektrotechniczny
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2011
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tom R. 87, nr 9b
111-114
EN
This article reports vector magnetic properties of non-oriented silicon steel sheets at the liquid nitrogen temperature of 77 K. The amplitude of magnetic field decreases at 77 K under alternating and rotational flux conditions when B is large. The iron loss increases at 77 K because of the increase in eddy-current loss due to the increase in electrical conductivity.
PL
W artykule przedstawiono badania blachy elektrotechnicznej niezorientowanej w temperaturze ciekłego azotu 77 K. Straty mocy w tej temperaturze wzrastają na skutek wzrostu prądów wirowych spowodowanego zwiększeniem przewodności elektrycznej.
3
Content available remote Impedance pharyngography for diagnosis of swallowing disorders
80%
Yamamoto Y. , Nakamura T. , Kusuhara T. , Mori K.
Biocybernetics and Biomedical Engineering
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2002
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tom Vol. 22, no. 4
97-103
EN
Swallowing disorders are a serious problem occurring in association with cerebrovascular disorder, nerve or muscle disease, laryngeal or esophageal disease, or advanced age. Unfortunately, it is difficult to evaluate swallowing disorders quantitatively. For this reason, we previously proposed a new method, impedance pharyngography (IPG), for evaluating swallowing disorders noninvasively by measuring neck electrical impedance during swallowing. In this study, the efficacy of this method was tested in a cohort of patients with IPG and healthy controls. The change of neck electrical impedance in the pharyngeal phase is mainly caused by the changes in the equivalent cross-sectional area of the near epiglottis. In addition, the increase in equivalent cross-sectional area due to raising of the larynx caused a decrease in neck electrical impedance in the pharyngeal phase. In the case of healthy subjects, IPG results were highly reproducible, and the patterns were simple and similar. In subjects with advanced age, IPG are delayed-action, slowly changing and less reproducible, and showed various patterns among the subjects. In subjects with swallowing disorders, IPG results were less reproducible and showed irregular variable patterns. We therefore conclude that the IPG pattern can be used effectively as a simple index of swallowing activity.
4
Content available Effect of robot utterances using onomatopoeia on collaborative learning
70%
Jimenez F. , Kanoh M. , Yoshikawa T. , Furuhashi T. , Nakamura T.
Journal of Artificial Intelligence and Soft Computing Research
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2014
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tom Vol. 4, No. 2
125--131
EN
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.
5
Content available Involvement of cyclooxygenase (COX)-2 products in acceleration of ulcer healing by gastrin and hepatocyte growth factor
51%
Brzozowski T. , Konturek P. C. , Konturek S. J. , Pajdo R. , Schuppan D. , Drozdowicz D. , Ptak A. , Pawlik M. , Nakamura T. , Hahn E. G.
Journal of Physiology and Pharmacology
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2000
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tom 51
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nr 4,1
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