This article explores treatment method of waste fountain solution from sheet-fed offset printing. First calcium chlorate is used to have a oxidation treatment for the waste water, then it is dealt with composite coagulants polyaluminium chloride (PAC) and cation polyacrylamide (CPAM) under different pH value. The results show that quality of the waste fountain solution could reach the national second-grade standard of sewage comprehensive discharge through the above treatment (GB 8978--1996) when treating with 0.7 g/L calcium hypochlorite and then sinking with PAC 4.0 g/L, CPAM 75.0 mg/L under the pH value of 8.0 for about 10 minutes. With the optimum treatment conditions removal rates of COD, ammonia nitrogen, phosphate and hexavalent chromium are above 90%, 94%, near to 98% and above 99% respectively.
Recently, DNA-CTMA lipid complex as the environmentally-friendly materials has been investigated extensively in novel functional optical and electronic devices. We have previously reported that the hysteresis mechanism of the nonvolatile transistor memory device in lower temperature region from -150 ~ -20 o C (L. Liang et al. Organic Electronics 28, 2016, 294-298). In this study, the hysteresis mechanism in the high temperature region range from 25 ~ 150 o C has been investigated through studying the temperature dependence of transfer characteristics, X-ray diffraction patterns (XRD), differential scanning calorimetry (DSC) as well as the dielectric performance of DNA-CTMA complex. The result indicates that the dipoles inside the DNA-CTMA stacking crystalline structure contribute to the appearance of hysteresis in bio-OTFT device at the high temperature.
A variety of friction exists during gravure printing machine run-time. The friction between gravure roller and scraping blade has a great effect on the printing quality and gravure printing endurance. In this article, the friction between gravure roller and scraping blade is studied from the micro-contact perspective. The qualitative research of the factors that affect the friction between gravure roller and scraping blade is done, in order to confirm the effect law of the printing speed, scraping blade angle and gravure printing machine vibration on the friction between gravure roller and scraping blade.
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