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A new polarity sensitive fluorescent probe CO-DBD with deepred to near-infrared emission was designed and synthesized. CO-DBD consists of β-diketone-boron difluoride and coumarin moieties, showing higher fluorescence intensity and shorter emission wavelength in low-polarity solvent. Notably, CO-DBD gives high absolute fluorescence quantum yield of 0.631 in toluene. Theoretical calculation results verify that the polarity response is attributed to intramolecular charge transfer and twisted intramolecular charge transfer process. Further experimental data demonstrate that CO-DBD displays high selectivity, sensitivity and excellent stability. The precise polarity of binary mixture can be quantified by ratio fluorescence intensity of CO-DBD. Moreover, this probe is successfully applied for live cell imaging with high contrast.

In order to facilitate the adjustment of process parameters for tufting machine, a coordinated control system of tufting carpet machines using AC servo motor to feed yarn and backing cloth has been developed. The system adopt adjusting speed of the servo motors which directly connected with the according axis to fulfill the adjustment of yarn delivery and backing cloth feeding instead of adjustment of conventional mechanical transmission chain.According to the actual requirements of control system, designed and developed the control system software and hardware. The system through the program interface to set and adjust the yarn and backing cloth feeding ratios, and send the parameters through CAN bus down to the two axes motion control board which was designed based on DSP microchip, after set the start signal, the DSP control board can adjust the servo motors' speeds coordinate with the monitored spindle's speed and fulfill the yarn and backing cloth feeding speeds in accordance with the spindle's.Through test in prototype machine, the process parameter of yarn and backing cloth feeding ratio could be changed in a short time.

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