In this study, we developed the first linear Joint North Sea Wave Project(JONSWAP) spectrum(JS), which involves a transformation from the JS solution to the natural logarithmic scale. This transformation is convenient...In this study, we developed the first linear Joint North Sea Wave Project(JONSWAP) spectrum(JS), which involves a transformation from the JS solution to the natural logarithmic scale. This transformation is convenient for defining the least squares function in terms of the scale and shape parameters. We identified these two wind-dependent parameters to better understand the wind effect on surface waves. Due to its efficiency and high-resolution, we employed the airborne Light Detection and Ranging(LIDAR) system for our measurements. Due to the lack of actual data, we simulated ocean waves in the MATLAB environment, which can be easily translated into industrial programming language. We utilized the Longuet-Higgin(LH) random-phase method to generate the time series of wave records and used the fast Fourier transform(FFT) technique to compute the power spectra density. After validating these procedures, we identified the JS parameters by minimizing the mean-square error of the target spectrum to that of the estimated spectrum obtained by FFT. We determined that the estimation error is relative to the amount of available wave record data. Finally, we found the inverse computation of wind factors(wind speed and wind fetch length) to be robust and sufficiently precise for wave forecasting.展开更多
Health risk associated with exposure to high-charge and -energy (HZE) particles in outer space has been discusseda lot mainly because its accurate assessment is complex and multifactorial[1??3]. Exponentially growing ...Health risk associated with exposure to high-charge and -energy (HZE) particles in outer space has been discusseda lot mainly because its accurate assessment is complex and multifactorial[1??3]. Exponentially growing cells are themost widely used in vitro model for risk assessment. However, majority of the cells in human body stay quiescent(in G0 phase) even though some cells, such as liver cells and stem cells, can resume cell cycle and enter G1 phase inresponse to exogenous stimuli such as injury[4]. Therefore, it is reasonable to use G0 cells as an in vitro experimentalmodel for risk assessment of space radiation.展开更多
基金supported by the Scientific Instruments Development Program of NSFC (No.615278010)the National Key Basic Research Program of China (973 program) under grant No.2014CB845301/2/3
文摘In this study, we developed the first linear Joint North Sea Wave Project(JONSWAP) spectrum(JS), which involves a transformation from the JS solution to the natural logarithmic scale. This transformation is convenient for defining the least squares function in terms of the scale and shape parameters. We identified these two wind-dependent parameters to better understand the wind effect on surface waves. Due to its efficiency and high-resolution, we employed the airborne Light Detection and Ranging(LIDAR) system for our measurements. Due to the lack of actual data, we simulated ocean waves in the MATLAB environment, which can be easily translated into industrial programming language. We utilized the Longuet-Higgin(LH) random-phase method to generate the time series of wave records and used the fast Fourier transform(FFT) technique to compute the power spectra density. After validating these procedures, we identified the JS parameters by minimizing the mean-square error of the target spectrum to that of the estimated spectrum obtained by FFT. We determined that the estimation error is relative to the amount of available wave record data. Finally, we found the inverse computation of wind factors(wind speed and wind fetch length) to be robust and sufficiently precise for wave forecasting.
文摘Health risk associated with exposure to high-charge and -energy (HZE) particles in outer space has been discusseda lot mainly because its accurate assessment is complex and multifactorial[1??3]. Exponentially growing cells are themost widely used in vitro model for risk assessment. However, majority of the cells in human body stay quiescent(in G0 phase) even though some cells, such as liver cells and stem cells, can resume cell cycle and enter G1 phase inresponse to exogenous stimuli such as injury[4]. Therefore, it is reasonable to use G0 cells as an in vitro experimentalmodel for risk assessment of space radiation.
