In order to find the strains which can produce high ethanol yield as well as tolerate inhibitors on the lignocellulosic hydrolysates for developing the renewable bioenergy, the sepecial yeast must be explored. After acclimatizing 23 days and using five different acclimation media with sequential increase in the concentration of inhibitory compounds , a kind ofsaccharomyces cerevisiaestrain resistant to inhibitors was obtained . When the yeast resistant to drug and the parent strain grew in the same media which contained several inhibitory compounds 3.2 g/L acetic acid , 0.8 g/L furfural , 0.4 g/L formic acid , the new yeasts maximal ethanol yield can reach 0.428 g/g , up to 85.6% of theoretical ethanol yield. Compared with drug resistant yeast , the parent strains maximal ethanol production yield only can reach 0.246 g/g , up to 52.8% of theoretical ethanol yield . After 5 continuous ages , the average ability of producing ethanol was stable. Compared with parent strain, the yeast resistant to drug had good ability to ferment glucose and produce ethanol as well as tolerate inhibitors .The new yeast has extensive application prospect in the bioethanol production.
In the context of technological innovation promoting the long-term sustainable development of enterprises, how to better motivate senior executives to create greater value for an enterprise is being widely discussed. In particular, the COVID-19 outbreak has raised concerns about whether companies can deliver more value by holding large amounts of cash. However, although scholars have conducted a lot of research on topics such as innovation and firm value, how differentiated executive compensation incentives regulate the relationship between firm innovation and the value of cash holdings has hardly been explored. This paper selects the balanced panel data of 1470 A-share listed companies from 2012 to 2020 in China to explore the relationship between innovation investment, executive compensation, and the value of cash holdings. It is found that innovation investment has a positive impact on the value of the cash holdings. Based on Herzberg’s hygiene motivational factors, different types of executive compensation may have a hygiene effect or a motivational effect, which is different. As a result, the moderating effect of executive compensation on innovation investment and the value of cash holdings are significantly different. Executive equity compensation and in-service consumption are motivational attributes. They have a positive moderating effect on innovation investment and the value of cash holdings. The moderating effect of executive monetary compensation on innovation investment and the value of cash holdings changes with the change in monetary compensation. When monetary compensation is lower than the threshold value, monetary compensation is reflected as a hygiene attribute, so it has no significant positive moderating effect on innovation investment and the value of cash holdings. When monetary compensation is higher than the threshold value, monetary compensation is reflected as a motivational attribute, so it has a significant positive moderating effect on innovation investment and the value of cash holdings. Meanwhile, it is tested that monetary compensation is not manipulated by executive compensation defense behavior when it is reflected as motivational attributes.
With the increasing concern of all sectors of society about climate change, enterprises have become an important subject to undertake environmental protection. At the same time, enterprises have to seek survival and development under the background of economic policy uncertainty. Therefore, companies need to not only fulfill their environmental responsibilities but also find ways to respond to changes in economic policies through innovation. In the study, a three-variable time-varying vector autoregressive (TVP-VAR) model with stochastic volatility was used to investigate the nonlinear dynamic effects of economic policy uncertainty and low-carbon economic transition on enterprise innovation in China. It is found that the influence of economic policy uncertainty on enterprise innovation is time-varying and asymmetrical, especially with the 2008 financial crisis as the turning point. After the financial crisis, the positive impact of economic policy uncertainty on enterprises has been weakening, and in 2015, the positive impact turned into a negative impact. In general, economic policy uncertainty is not conducive to the transition to low-carbon economic transition, and with the outbreak of the financial crisis in 2008, the negative impact reached a negative peak. The low-carbon economic transition has a significant crowding-out effect on enterprise innovation, while enterprise innovation has a significant spillover effect on low-carbon economic transition. The conclusion can provide the scientific basis for enterprises to adapt to the change in the economic environment to complete low-carbon economic transition and formulate innovation strategies, which is conducive to the sustainable development of the ecological environment and economic society.
For the cholesteric liquid crystal (hereinafter short for Ch-LC) possesses special optical properties, it has specific applications in the area of liquid crystal displays and optoelectronic devices. Specimens of Ch-LCs in planar and focal conic texture stably are prepared. The photographs of textures are shot by polarizing microscope and transmittance spectrums of different textures are measured by spectrophotometer. It is found that the specimen in focal conic texture with large crystal domains has the well transmission property. The experiment has an important significance for applications of liquid crystals.
An analytical expression of the threshold pump power of the fiber laser with three-energy-level dopants has been obtained from rate equations including loss coefficients of the pump and laser radiations. And the rate equations describing the threshold pumped fiber lasers have been analytically solved following the derivation of the implicit expression specifying the pump variation along the fiber and expressions of the position dependent population densities on the three energy levels in terms of the pump variation.
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