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Additional file 1: Supplementary Figure 1. The detailed process of data analysis in this study.

Additional file 2: Supplementary Figure 2. The potassium levels in people with different types of salt added at table.

The LED night vision imaging detection has been widely used in many fields, such as vehicle mounted night vision auxiliary driving system and urban surveillance. The LED array as light source has advantages of low costs and small size. However, due to the influence of atmospheric turbulence, absorption and scattering by aerosol particles, and the limitation of imaging equipment, image quality is severely degraded. Therefore, the presented effort calculated the modulation transfer function (MTF) of degradation through the quantization of light beam transmitting in the night air as well as the influence of atmospheric turbulence and aerosol. Using the degradation model as priori knowledge, the target image is recovered by model-based image processing algorithms, results of which are compared and evaluated. The experimental results verified the effectiveness of the proposed degradation model for LED night vision imaging.

Direct writing techniques for the printing of colloidal multiwalled carbon nanotubes (CNTs) embedded in polydimethylsiloxane (PDMS) were developed herein to fabricate complex structures including woodpiles, tetragonal scaffolds, and gradient mesh structures. The multiwalled CNTs served as a conductive filler and thickening agent for the printing ink. A suitable rheological behavior was obtained by mixing the CNTs with PDMS dissolved in an isopropyl alcohol solvent. A 7 wt % CNT loading in the PDMS was optimum for printing gap-spanning features at a nozzle moving speed of 20 mm/s. The printed structures, including a woodpile and gradient mesh structure, were capable of detecting changes in external mechanical pressure. Printed CNT/PDMS strips exhibit electrical actuation with good mechanical performance (strain of 8.9%) at a low actuation voltage (60 V). The performance characterization and application display demonstrated the possibility of developing custom complex CNT/PDMS structures for a broad range of applications, including soft robots and flexible electronic devices.

For the application of Time Domain Reflectometry (TDR) technology in landslide monitoring, a new mountain landslide slip amount calculation model based on TDR technology is put forward. This article describes the basic principles of TDR landslide monitoring and the theory of electromagnetic pulse propagation in a coaxial cable. Deduced calculation model of landslides slippage, conducted a laboratory simulation tests landslides, and discussed the landslides slippage effect on TDR waveform, get and verify specific calculation model by the test. The results showed that, TDR reflected voltage with the landslide slip amount is increasing, the different deformation point of the reflective voltage with the shift to a linear relationship. The two errors between calculation model slip and the actual slip are not more than 2 mm.