Abstract Background Microalgae are considered as a source of low pollution and renewable fuel due to their ability to synthesize an abundance of lipids. Conventional methods for lipid quantification are time consuming and chemically contaminated, while spectroscopic method combined with mathematical model is much more attractive due to its ability of qualitative and quantitative analysis of material composition, in this sense, terahertz technology provides not only timely and nondestructive testing without chemical pollution, but also provides information on the functional group vibration mode and structure of the measured components. Therefore，terahertz technology is utilized in our investigation and proposed for microalgae metabolism detection. Results The aim of this study was to use Terahertz spectroscopy to observe lipid content in Scenedesmus obliquus ( S. obliquus ). We collected the THz spectra of S. obliquus which were cultivated under nitrogen stress and terahertz spectroscopy was used to analyze changes in substance components (lipids, proteins, carbohydrates and β-carotene). The PLS algorithm was used to model the terahertz data to distinguish the different lipid content of S. obliquus under nitrogen stress. The correlation coefficient of the prediction results of the lipid characteristic band modeling was above 0.991, and the root mean square error was less than 0.132. It indicated that terahertz technology can be used to discriminate S. obliquus cells under different nitrogen stress effectively. The correlation between the terahertz characteristic peak (9.3 THz) and the total lipid content determined by gravimetry reaches 0.960. The final results were compared with the commonly used spectroscopic methods for lipid observation (Raman spectroscopy). Conclusions In this article, we demonstrated the effectiveness of terahertz spectroscopy to monitor changes in microalgae lipid content under nitrogen stress. Terahertz spectroscopy is more suitable for industrial production or ordinary laboratories which require intermediate result with low frequency screening. When quantifying microalgae lipids, the constraint of terahertz spectroscopy is far less than that of Raman spectroscopy, and it is easier for operator to accurately quantify microalgae lipid. In addition, it is still in early stage for the study of microalgae using terahertz spectroscopy technology, there is still much potential for us to explore.
Despite a sustainable research interest in home appliances, the understanding of cooker user experience has not been gained in a more holistic fashion.The present study aims to pinpoint the key attributes of user experience by examining online reviews and then define the main cultural differences between Chinese and American culture in this respect.To that end, 1,165 English online reviews on Amazon.com and 1,272 Chinese on JD. com were collected from January 2022 to January 2023.Topic modeling and a thematic analysis are combined to capture the key factors in user experience and to explore the underlying cultural differences.The findings suggest that user experience is made up of two Meta-factors-pragmatic and hedonic and culture plays a very important role in how these factors work out in overall user experience.Chinese users tend to be more collective, status-conscious while American users turn out to be more individualistic and equality-minded.Although the cooker users from these two countries both display high uncertainty avoidance, there is nuance difference in their perception.The managerial implications arising from this study is hoped to help enterprises or marketers from both countries to tailor their products or services culturally in the global market.
The article introduced the experience of mind innovation, service mode innovation and institution innovation in Shanghai Renji Hospital Group. Ownership right and management right was separated and principal management operation mode was selected. The internal management mechanism was reformed concurrent. The group researched and developed a series of management instruments and the scale and benefit of the group were both widened.
The empirical analysis on the farmer sports fitness project effectiveness construction promoting the farmer happy index is new domain research.The countryside sports services structure the goal of farmer participating in the farmer sports fitness project effectiveness construction is to raise farmer's physical and moral integrity level and the life quality,promote farmer's happy index,speed up the socialism new rural reconstruction service.Therefore,it's necessary todo research on farmer happy index under the new rural reconstruction and all-people body-building background,seek for the successful experience of promoting people happy index,guide farmers to form the healthy and civilized life style,enhance the farmer's enthusiasm to participate in the farmer sports fitness engineering construction,in order to promote physical and moral integrity development,provide the theory and the practice reference for the new countryside sports construction and the sports powerful nation construction.
Abstract Background Microalgae are considered as a source of low pollution and renewable fuel due to their ability to synthesize an abundance of lipids. Conventional methods for lipid quantification are time-consuming and chemically contaminated, while spectroscopic method combined with mathematical model is much more attractive due to its ability of qualitative and quantitative analysis of material composition, in this sense, terahertz technology provides not only timely and non-destructive testing without chemical pollution, but also provides information on the functional group vibration mode and structure of the measured components. Therefore, terahertz technology is utilized in our investigation and proposed for microalgae metabolism detection. Results The aim of this study was to use terahertz spectroscopy to observe lipid content in Scenedesmus obliquus ( S. obliquus ). We collected the THz spectra of S. obliquus which were cultivated under nitrogen stress and terahertz spectroscopy was used to analyze changes in substance components (lipids, proteins, carbohydrates and β-carotene). The PLS algorithm was used to model the terahertz data to distinguish the different lipid content of S. obliquus under nitrogen stress. The correlation coefficient of the prediction results of the lipid characteristic band modeling was above 0.991, and the root mean square error was less than 0.132. It indicated that terahertz technology can be used to discriminate S. obliquus cells under different nitrogen stress effectively. The correlation between the terahertz characteristic peak (9.3 THz) and the total lipid content determined by gravimetry reaches 0.960. The final results were compared with the commonly used spectroscopic methods for lipid observation (Raman spectroscopy). Conclusions In this article, we demonstrated the effectiveness of terahertz spectroscopy to monitor changes in microalgae lipid content under nitrogen stress. Terahertz spectroscopy is more suitable for industrial production or ordinary laboratories which require intermediate result with low-frequency screening. When quantifying microalgae lipids, the constraint of terahertz spectroscopy is far less than that of Raman spectroscopy, and it is easier for operator to accurately quantify microalgae lipid. In addition, it is still in early stage for the study of microalgae using terahertz spectroscopy technology, there is still much potential for us to explore.
'/%3e%3cuse xlink:href='%23a' transform='rotate(23.036 .093 25.536)'/%3e%3cuse xlink:href='%23a' transform='rotate(45.87 1.273 16.18)'/%3e%3cuse xlink:href='%23a' transform='rotate(69.945 .996 12.078)'/%3e%3cuse xlink:href='%23a' transform='rotate(20.66 -19.689 31.932)'/%3e%3c/svg%3e)