We fabricated a microfluidic chip with simple structure and good sealing performance, and studied the influence of the electric field on THz absorption intensity of liquid samples treated at different times by using THz time domain spectroscopy system. The tested liquids were deionised water and CuSO4, CuCl2, NaHCO3, Na2CO3 and NaCl solutions. The transmission intensity of the THz wave increases as the standing time of the electrolyte solution in the electric field increases. The applied electric field alters the dipole moment of water molecules in the electrolyte solution, which affects the vibration and rotation of the whole water molecules, breaks the hydrogen bonds in the water, increases the number of single water molecules and leads to the enhancement of the THz transmission spectrum.
Corporate alliances have become an important way for firms to share the resources and costs of innovation. However, whether corporate technology alliances can effectively enhance the ambidextrous green innovation (AGI) capabilities of firms is a question that still needs to be answered. Building networks of corporate technology alliances based on joint patent application data from the China National Intellectual Property Administration (CNIPA) for the period of 2015–2019, this study investigated the impact of network centrality and structural hole characteristics on exploitative green innovation (IGI) and exploratory green innovation (RGI) from the perspective of internal and external pressures. The empirical results showed that (1) network centrality and structural holes could promote AGI and that the impact on IGI was greater than that on RGI. However, an examination based on lagged effects found a greater impact on RGI. (2) The impact of alliance networks on AGI was positively moderated by internal and external pressures. (3) There were complementary effects between the internal and external pressures. Our study emphasized that it was important to balance AGI to win short-term and long-term competition.
Sodium carboxymethyl cellulose is a type of macromolecular chemical substance that is widely used in the industry for food thickening. In this study, terahertz and microfluidic technologies were combined, and a microfluidic chip with a channel depth of 50 μm was fabricated to carry samples. The terahertz characteristics of the sodium carboxymethyl cellulose colloid were studied at different concentrations and applied electric fields. The obtained results showed that different concentrations of sodium carboxymethyl cellulose have different time-domain spectra; with an increase in concentration, the terahertz transmittance of sodium carboxymethyl cellulose decreased. Under the applied electric field treatment, the longer the electric field acting time is, the higher the terahertz transmission intensity is. This approach is a safe and reliable new method for the determination of sodium carboxymethyl cellulose concentration, which provides technical support for the in-depth study of sodium carboxymethyl cellulose.
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