Wyniki wyszukiwania - BazTech

1

Electromagnetic compatibility of wireless medical telemetry systems and light-emitting diode (LED) lamps

Ishida K., Arie S., Gotoh K., Hanada E., Hirose M., Matsumoto Y.

Przegląd Elektrotechniczny

|

2018

|

R. 94, nr 2

25--28

EN

Light-emitting diode (LED) lamps have been widely introduced in clinical settings for energy conservation and cost reduction However, LED lamps radiate electromagnetic noise and they cause poor reception of broadcasting and wireless communications. In this study, we investigated the effects of LED lamp use on the electromagnetic environment surrounding wireless medical telemetry systems and discuss the safe installation of LED lamps in a clinical settings.

PL

Oświetlenie LED jest szeroko stosowane w klinikach medycznych, pozwalając na oszczędność energii i redukcję kosztów. Źródła światła bazujące na diodach LED emitują szum elektromagnetyczny powodując pogorszenie komunikacji bezprzewodowej. Artykuł przedstawia badania wpływu lamp LED na elektromagnetyczne środowisko obejmujące bezprzewodowe systemy telemetrii medycznej i omawia zasady instalacji lamp LED w obiektach medycznych.

2

Re-examination of manus-only and manus-dominated sauropod trackways from Morocco

Ishigaki S., Matsumoto Y.

Geological Quarterly

|

2009

|

Vol. 53, No 4

441-448

EN

Manus-only and manus-dominated trackways of sauropods previously reported from the Iouaridene Basin of Morocco are relocated and re-examined. One trackway, interpreted as a manus-only trackway, was a misinterpretation of a poorly preserved trackway of a large theropod that walked in the opposite direction to that previously inferred. Two previously described manus-dominated trackways could be underprints. One previously described manus-only trackway and a newly discovered manus-only trackway could also be underprints. However, if the true im printing surface is not identified, an "underprint origin" cannot be accepted as firm evidence that the were imprinted on land, and a swimming or submerged sauropod might have left similar underprints under the contact layer. Kinematic investigations might help to reconstruct the origin of the trackway. The two manus-only trackways from the Iouaridene tracksite apparently show alternating pace lengths which suggests semi-galloping to galloping gait patterns by the trackmakers. Such a galloping gait pattern has never been reported from regular sauropod trackways, and it is unclear as to whether such a trackway pattern repre sents rapid locomotion. A partly submerged sauropod could perhaps register such galloping gait manus-only trackway patterns as a result of swimming behavior.

3

Hybrid stabilization of discrete-time LTI systems with two quantized signals

Zhai G., Matsumoto Y., Chen X., Imae J., Kobayashi T.

International Journal of Applied Mathematics and Computer Science

|

2005

|

Vol. 15, no 4

509-516

EN

We consider stabilizing a discrete-time LTI (linear time-invariant) system via state feedback where both the quantized state and control input signals are involved. The system under consideration is stabilizable and stabilizing state feedback has been designed without considering quantization, but the system’s stability is not guaranteed due to the quantization effect. For this reason, we propose a hybrid quantized state feedback strategy asymptotically stabilizing the system, where the values of the quantizer parameters are updated at discrete time instants. We also extend the result to the case of static output feedback.

4

Three-dimensional structure of cornstarch-oxygen two-phase detonation in a circular tube

Tsuboi N., Hayashi A. K., Matsumoto Y.

Archivum Combustionis

|

2001

|

Vol. 21 nr 2

101-116

EN

Numerical simulations were performed with a parallel computer to solve for the behaviour of the three-dimensional gas-solid two-phase detonation. The numerical method is a second-order modified Harten-Yee TVD upwind scheme and time integration uses a first order Euler integration. A two-step chemical reaction model represents the reaction of constarch-particles and oxygen. The numerical results show that a periodic two-headed detonation appears with a three-dimensional propagation mechaism before and after a triple point collisions. A comparison between the numerical and experimental results reveals that detonation velocity of numerical results agrees well with that of experimental results.