OBSERVATION AND SIMULATION OF TSUNAMIS INDUCED BY THE 2003 TOKACHI-OKI EARTHQUAKE (M 8.0)

2015 ◽  
Vol 2 (3) ◽  
Author(s):  
Tatsuo Ohmachi ◽  
Shusaku Inoue ◽  
Tetsuji Imai
Keyword(s):  
Rayleigh Wave ◽  
Water Pressure ◽  
Near Field ◽  
Source Region ◽  
Tsunami Source ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Tsunami Simulation ◽  
Sea Bed ◽  
Band Pass

The 2003 Tokachi-oki earthquake (MJ 8.0) occurred off the southeastern coast of Tokachi, Japan, and generated a large tsunami which arrived at Tokachi Harbor at 04:56 with a wave height of 4.3 m. Japan Marine Science and Technology Center (JAMSTEC) recovered records of water pressure and sea-bed acceleration at the bottom of the tsunami source region. These records are first introduced with some findings from Fourier analysis and band-pass filter analysis. Water pressure disturbance lasted for over 30 minutes and the duration was longer than those of accelerations. Predominant periods of the pressure looked like those excited by Rayleigh waves. Next, numerical simulation was conducted using the dynamic tsunami simulation technique able to represent generation and propagation of Rayleigh wave and tsunami, with a satisfactory result showing validity and usefulness of this technique. Keywords: Earthquake, Rayleigh wave, tsunami, near-field

scholarly journals Spintronic RF-Direct on-off Keying Modulation Using a Frequency Division Multiplex

Electronics ◽  
2021 ◽  
Vol 10 (18) ◽  
pp. 2200
Author(s):  
Inn-Yeal Oh ◽  
Min-Soo Kang ◽  
Kun-Sik Kim ◽  
Chang-Ha Choi
Keyword(s):  
Transmission Rate ◽  
Near Field ◽  
Digital Data ◽  
Modulation Method ◽  
Spin Torque ◽  
Band Pass Filter ◽  
Frequency Division ◽  
Pass Filter ◽  
Modulation Technique ◽  
Band Pass

This paper presents the results of spintronic wireless communication using a new modulation method, spin RF-direct on-off keying modulation using a frequency division multiplex (FDM), which modulates amplitude and frequency simultaneously with a spin torque nano-oscillator (STNO) array. For the new modulation technique, each channel can be assigned to every STNO on the STNO array, and each STNO is simultaneously modulated by on-off keying with digital data directly. These modulation technologies have the advantage of increasing the data transmission rate by the number of operating STNOs. In recent years, efforts to increase the speed of transmission are important as the amount of data it sends increase. The receiver demodulates data on every channel through a band pass filter acquiring the frequency assigned to each channel, respectively. To initially confirm the possibility of realizing spin RF-direct on-off keying modulation using an FDM, we demonstrated the proposed modulation technique with two STNOs in an array, setting one STNO at 3.5 GHz frequency and the other at 4.2 GHz, and communicated wirelessly with a two-channel receiver in the near field. A data rate of up to 4 Mbps is obtained with the new modulation technique under 10 mm distance, and the DC power consumption is 0.18 mW per STNO in transmitter, including logic circuit operation.

A comparative study on the demodulation capability of a single loop optoelectronic oscillator with and without a dynamic band Pass filter

Optik ◽  
2021 ◽  
Vol 226 ◽  
pp. 165924
Author(s):  
Shantanu Mandal ◽  
Kousik Bishayee ◽  
Arindum Mukherjee ◽  
B N Biswas ◽  
Chandan Kumar Sarkar
Keyword(s):  
Comparative Study ◽  
Band Pass Filter ◽  
Optoelectronic Oscillator ◽  
Pass Filter ◽  
Single Loop ◽  
Band Pass

Switchable band-pass filter for terahertz waves using VO2-based metamaterial integrated with silicon substrate

2021 ◽  
Vol 28 (1) ◽  
pp. 92-98
Author(s):  
Ying Huang ◽  
Qicong He ◽  
Dongping Zhang ◽  
Yoshiaki Kanamori
Keyword(s):  
Silicon Substrate ◽  
Band Pass Filter ◽  
Terahertz Waves ◽  
Pass Filter ◽  
Band Pass
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