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Papers by STALIN S STALIN S
Physics Letters A
In this paper, we report a more general class of nondegenerate soliton solutions, associated with... more In this paper, we report a more general class of nondegenerate soliton solutions, associated with two distinct wave numbers in different modes, for a certain class of physically important integrable two component nonlinear Schrödinger type equations through bilinearization procedure. In particular, we consider coupled nonlinear Schrödinger (CNLS) equations (both focusing as well as mixed type nonlinearities), coherently coupled nonlinear Schrödinger (CCNLS) equations and long-wave-shortwave resonance interaction (LSRI) system. We point out that the obtained general form of soliton solutions exhibit novel profile structures than the previously known degenerate soliton solutions corresponding to identical wave numbers in both the modes. We show that such degenerate soliton solutions can be recovered from the newly derived nondegenerate soliton solutions as limiting cases.
Oceanography, 2017
We present a record of ambient sound obtained using a unique deep-ocean instrument package and mo... more We present a record of ambient sound obtained using a unique deep-ocean instrument package and mooring that was successfully deployed in 2015 at Challenger Deep in the Mariana Trench. The 45 m long mooring contained a hydrophone and an RBR™ pressure-temperature sensor. The hydrophone recorded continuously for 24 days at a 32 kHz sample rate. The pressure logger recorded a maximum pressure of 11,161.4 decibars, corresponding to a depth of 10,829.7 m, where actual anchor depth was 10,854.7 m. Observed sound sources included earthquake acoustic signals (T phases), baleen and odontocete cetacean vocalizations, ship propeller sounds, airguns, active sonar, and the passing of a Category 4 typhoon. Overall, Challenger Deep sound levels in the ship traffic band (20-100 Hz) can be as high as noise levels caused by moderate shipping, which is likely due to persistent commercial and military ship traffic in the region. Challenger Deep sound levels due to sea surface wind/waves (500 Hz to 1 kHz band) are as high as sea state 2, but can also be very low, equivalent to sea state 0. To our knowledge, this is the first long-term (multiday to week) broadband sound record, and only the fifth in situ measurement of depth, ever made at Challenger Deep. Our study indicates that Challenger Deep, the ultimate hadal (>6,000 m) environment, can be relatively quiet but is not as acoustically isolated as previously thought, and weatherrelated surface processes can influence the soundscape in the deepest parts of the ocean.
2012 Oceans - Yeosu, 2012
ABSTRACT Recent advances in deep-ocean tsunami measurement technology coupled with tsunami foreca... more ABSTRACT Recent advances in deep-ocean tsunami measurement technology coupled with tsunami forecast models have reliably demonstrated that tsunami impact can be predicted before the tsunami reaches the affected coastlines. These forecast models are based on observations that are typically 1000 km or more from the earthquake epicenter. The major challenge today is to forecast tsunamis in the near field where the tsunami wave is often overwhelmed by the seismic event. Nano-resolution pressure sensors have the necessary resolution to distinguish between tsunami and seismic signals and ocean noise in the near field. This study describes the results of a 17 month experiment that was initiated on June 30, 2010, at the Monterey Accelerated Research System (MARS) cabled observatory in Monterey Bay, California. The experiment compared a conventional pressure sensor and a nano-resolution pressure sensor at a depth of approximately 900 m. The results presented include examples of near- and far-field earthquakes and micro-tsunamis that were detected by the nano-resolution pressure sensor. Through wavelet analysis several micro-tsunamis were identified. The paper also describes additional testing planned by NOAA on the nano-resolution pressure sensors for potential application to the NOAA DART System.
Proceedings of the International Tsunami Symposium …, 2001
Physics Letters A
In this paper, we report a more general class of nondegenerate soliton solutions, associated with... more In this paper, we report a more general class of nondegenerate soliton solutions, associated with two distinct wave numbers in different modes, for a certain class of physically important integrable two component nonlinear Schrödinger type equations through bilinearization procedure. In particular, we consider coupled nonlinear Schrödinger (CNLS) equations (both focusing as well as mixed type nonlinearities), coherently coupled nonlinear Schrödinger (CCNLS) equations and long-wave-shortwave resonance interaction (LSRI) system. We point out that the obtained general form of soliton solutions exhibit novel profile structures than the previously known degenerate soliton solutions corresponding to identical wave numbers in both the modes. We show that such degenerate soliton solutions can be recovered from the newly derived nondegenerate soliton solutions as limiting cases.
Oceanography, 2017
We present a record of ambient sound obtained using a unique deep-ocean instrument package and mo... more We present a record of ambient sound obtained using a unique deep-ocean instrument package and mooring that was successfully deployed in 2015 at Challenger Deep in the Mariana Trench. The 45 m long mooring contained a hydrophone and an RBR™ pressure-temperature sensor. The hydrophone recorded continuously for 24 days at a 32 kHz sample rate. The pressure logger recorded a maximum pressure of 11,161.4 decibars, corresponding to a depth of 10,829.7 m, where actual anchor depth was 10,854.7 m. Observed sound sources included earthquake acoustic signals (T phases), baleen and odontocete cetacean vocalizations, ship propeller sounds, airguns, active sonar, and the passing of a Category 4 typhoon. Overall, Challenger Deep sound levels in the ship traffic band (20-100 Hz) can be as high as noise levels caused by moderate shipping, which is likely due to persistent commercial and military ship traffic in the region. Challenger Deep sound levels due to sea surface wind/waves (500 Hz to 1 kHz band) are as high as sea state 2, but can also be very low, equivalent to sea state 0. To our knowledge, this is the first long-term (multiday to week) broadband sound record, and only the fifth in situ measurement of depth, ever made at Challenger Deep. Our study indicates that Challenger Deep, the ultimate hadal (>6,000 m) environment, can be relatively quiet but is not as acoustically isolated as previously thought, and weatherrelated surface processes can influence the soundscape in the deepest parts of the ocean.
2012 Oceans - Yeosu, 2012
ABSTRACT Recent advances in deep-ocean tsunami measurement technology coupled with tsunami foreca... more ABSTRACT Recent advances in deep-ocean tsunami measurement technology coupled with tsunami forecast models have reliably demonstrated that tsunami impact can be predicted before the tsunami reaches the affected coastlines. These forecast models are based on observations that are typically 1000 km or more from the earthquake epicenter. The major challenge today is to forecast tsunamis in the near field where the tsunami wave is often overwhelmed by the seismic event. Nano-resolution pressure sensors have the necessary resolution to distinguish between tsunami and seismic signals and ocean noise in the near field. This study describes the results of a 17 month experiment that was initiated on June 30, 2010, at the Monterey Accelerated Research System (MARS) cabled observatory in Monterey Bay, California. The experiment compared a conventional pressure sensor and a nano-resolution pressure sensor at a depth of approximately 900 m. The results presented include examples of near- and far-field earthquakes and micro-tsunamis that were detected by the nano-resolution pressure sensor. Through wavelet analysis several micro-tsunamis were identified. The paper also describes additional testing planned by NOAA on the nano-resolution pressure sensors for potential application to the NOAA DART System.
Proceedings of the International Tsunami Symposium …, 2001