A novel scheme for generating optical chaos is proposed and experimentally demonstrated,which supports to simultaneously produce two low-correlation chaotic signals with wideband spectrum and suppressed time-delay-sig...A novel scheme for generating optical chaos is proposed and experimentally demonstrated,which supports to simultaneously produce two low-correlation chaotic signals with wideband spectrum and suppressed time-delay-signature(TDS).In the proposed scheme,we use the output of an external-cavity semiconductor laser(ECSL)as the driving signal of a phase modulator to modulate the output of a CW laser.Then the phase-modulated continuous-wave(CW)light is split into two parts,one is injected back into the ECSL that outputs one chaotic signal,while the other part is passed through a dispersion module for generating another chaotic signal simultaneously.The experimental results prove that the proposed scheme has three merits.Firstly,it can improve the bandwidth of ECSL-based chaos by several times,and simultaneously generate another wideband flat-spectrum chaotic signal.Secondly,the undesired TDS characteristics of the simultaneously-generated chaotic signals can be efficiently suppressed to an indistinguishable level within a wide parameter range,as such the complexities of the chaotic signals are considerably high.Thirdly,the correlation coefficient between these two simultaneously-generated chaotic signals is smaller than 0.1.The proposed scheme provides an attractive solution for parallel multiple chaos generation,and shows great potential for multiple channel chaos communications and multiple random bit generations.展开更多
Whether habit stimulation is effective in DOC patient arousal has not been reported. In this paper, we analyzed the responses of DOC patients to habit stimulation. Nineteen DOC patients with alcohol consumption or smo...Whether habit stimulation is effective in DOC patient arousal has not been reported. In this paper, we analyzed the responses of DOC patients to habit stimulation. Nineteen DOC patients with alcohol consumption or smoking habits were recruited and 64-channel EEG signals were acquired both at the resting state and at three stimulation states. Wavelet transformation and nonlinear dynamics were used to extract the features of EEG signals and four brain lobes were selected to investigate the degree of EEG response to habit stimulation. Results showed that the highest degree of EEG response was from the callname stimulation, followed by habit and music stimulations. Significant differences in EEG wavelet energy and response coefficient were found both between habit and music stimulation, and between habit and call-name stimulation. These findings prove that habit stimulation induces relatively more intense EEG responses in DOC patients than music stimulation, suggesting that it may be a relevant additional method for eliciting patient arousal.展开更多
Rapid advances in flexible and wearable smart textiles demand low-cost,high-energy/power-density fiber-shaped supercapacitors(FSCs).The performance of FSCs is determined by the fabrication and assembly of fiber-shaped...Rapid advances in flexible and wearable smart textiles demand low-cost,high-energy/power-density fiber-shaped supercapacitors(FSCs).The performance of FSCs is determined by the fabrication and assembly of fiber-shaped electrodes(FSEs),where an active charge-storage material is always clad around flexible charge transmission current collectors.Inspired by the tissue structure of natural bamboo,wherein parenchyma cells(PCs)that store nutrients are clad around bamboo fibers(BFs),we propose a strategy for converting bamboo cells into FSEs using conductive BFs and activated PCs as current collectors and active materials,respectively.The assembled electrode has a high specific capacitance of 1454 mF cm^(−2) at 0.64 mA cm^(−2).A solid-state FSC with a pair of bamboo-structured electrodes exhibited a substantially high energy density.Its mechanical flexibility enabled the knitting of wearable wristbands to drive ultra-small voltmeter indicators.This lightweight,low cost,and high-energy-density bamboostructured FSC could enable numerous smart textile applications.展开更多
基金This work was supported by the National Natural Science Foundation of China(Grant no.62171087,61671119)the Sichuan Science and Technology Program(Grant no.2021JDJQ0023)the Fundamental Research Funds for the Central Universities(Grant no.ZYGX2019J003).
文摘A novel scheme for generating optical chaos is proposed and experimentally demonstrated,which supports to simultaneously produce two low-correlation chaotic signals with wideband spectrum and suppressed time-delay-signature(TDS).In the proposed scheme,we use the output of an external-cavity semiconductor laser(ECSL)as the driving signal of a phase modulator to modulate the output of a CW laser.Then the phase-modulated continuous-wave(CW)light is split into two parts,one is injected back into the ECSL that outputs one chaotic signal,while the other part is passed through a dispersion module for generating another chaotic signal simultaneously.The experimental results prove that the proposed scheme has three merits.Firstly,it can improve the bandwidth of ECSL-based chaos by several times,and simultaneously generate another wideband flat-spectrum chaotic signal.Secondly,the undesired TDS characteristics of the simultaneously-generated chaotic signals can be efficiently suppressed to an indistinguishable level within a wide parameter range,as such the complexities of the chaotic signals are considerably high.Thirdly,the correlation coefficient between these two simultaneously-generated chaotic signals is smaller than 0.1.The proposed scheme provides an attractive solution for parallel multiple chaos generation,and shows great potential for multiple channel chaos communications and multiple random bit generations.
基金supported by the National Natural Science Foundation of China(81671038)
文摘Whether habit stimulation is effective in DOC patient arousal has not been reported. In this paper, we analyzed the responses of DOC patients to habit stimulation. Nineteen DOC patients with alcohol consumption or smoking habits were recruited and 64-channel EEG signals were acquired both at the resting state and at three stimulation states. Wavelet transformation and nonlinear dynamics were used to extract the features of EEG signals and four brain lobes were selected to investigate the degree of EEG response to habit stimulation. Results showed that the highest degree of EEG response was from the callname stimulation, followed by habit and music stimulations. Significant differences in EEG wavelet energy and response coefficient were found both between habit and music stimulation, and between habit and call-name stimulation. These findings prove that habit stimulation induces relatively more intense EEG responses in DOC patients than music stimulation, suggesting that it may be a relevant additional method for eliciting patient arousal.
基金supported by the National Natural Science Foundation of China (No.31971738,32001380,32122058).
文摘Rapid advances in flexible and wearable smart textiles demand low-cost,high-energy/power-density fiber-shaped supercapacitors(FSCs).The performance of FSCs is determined by the fabrication and assembly of fiber-shaped electrodes(FSEs),where an active charge-storage material is always clad around flexible charge transmission current collectors.Inspired by the tissue structure of natural bamboo,wherein parenchyma cells(PCs)that store nutrients are clad around bamboo fibers(BFs),we propose a strategy for converting bamboo cells into FSEs using conductive BFs and activated PCs as current collectors and active materials,respectively.The assembled electrode has a high specific capacitance of 1454 mF cm^(−2) at 0.64 mA cm^(−2).A solid-state FSC with a pair of bamboo-structured electrodes exhibited a substantially high energy density.Its mechanical flexibility enabled the knitting of wearable wristbands to drive ultra-small voltmeter indicators.This lightweight,low cost,and high-energy-density bamboostructured FSC could enable numerous smart textile applications.
