25 research outputs found
Two⁃dimensional correlation infrared spectroscopy and hyperspectral imaging to detect the changes of polysaccharide during the drying process of Polygonatum sibiricum
No full textObjectiveTo study the changes of polysaccharide in the drying process of "one steam and one preparation" of Polygonatum sibiricum.MethodsThe slices were steamed by atmospheric pressure water isolation steaming, and then dried by heat pump at 60 ℃. Near infrared spectroscopy (NIR), hyperspectral imaging (HSI) and middle and far infrared spectroscopy were used to analyze the characteristic spectra of the drying process of Polygonatum sibiricum, and the changes of polysaccharide during the drying process were studied by combining two-dimensional correlation infrared spectroscopy (2D-IR) analysis method.ResultsThe content of polysaccharide was 3.39% after steam heating for 11 h, and 6.67% after drying for 11 h. The content of polysaccharide showed a gradual increase during the drying process. Through two-dimensional correlation analysis, it was showed that the characteristic functional groups of polysaccharides were constantly changing. And at 1 016 cm-1, the sequence of functional group changes was C—H stretching of —CH2 → stretching and deformation of O—H group in water → stretching vibration of N—H group → combination of O—H stretching and C—O stretching → combination of C—H stretching and C—C stretching → glucopyranoside. HSI technology combined with chemometrics, PLSR was used to establish the spectral prediction model of polysaccharide, and the Rp2 of the model was 0.903.ConclusionInfrared spectroscopy, HSI technology combined with 2D-IR technology can well monitor the changes of polysaccharide in the drying process of Polygonatum sibiricum
Crafting Careers: Unraveling the Impact of Career Crafting on Career Outcomes and the Moderating Role of Supervisor Career Support Mentoring
No full textWith rapidly advancing artificial intelligence and digital transformation, career development is becoming increasingly uncertain and complex. A key strategy for individuals to adapt to dynamic environments is career crafting; however, research on how employees use it to enhance their career outcomes remains limited. Based on the conservation of resources theory and career construction theory, this study posits that career crafting enhances employees’ sense of control by helping them cope with career and environmental changes. This increased sense of control fosters greater career engagement and reduces career turnover intentions. Furthermore, we examine supervisor career support mentoring as a key contextual element shaping career crafting effectiveness. We collected three-wave data at one-week intervals from 232 hospitality frontline employees. Employees reported their career crafting, supervisor career support mentoring, and demographic information at Time 1; sense of control at Time 2; and career engagement and career turnover intentions at Time 3. The results indicate that career crafting improves employees’ sense of control, which enhances career engagement and reduces career turnover intentions. Additionally, supervisor career support mentoring strengthens the indirect effect of career crafting on career engagement and career turnover intentions through its impact on the sense of control. This study enriches our understanding of career crafting and of effectively leveraging its positive effects in organizational management
The mechanical properties of TCP phase of rapidly cooled molybdenum
No full textThe rapidly-cooling of pure molybdenum (Mo) at 1010 Ks−1 and the uniaxial tensile of the solid at a strain rate of 2 × 10 s−1 were studied by molecular dynamics simulation; then the structure evolution was investigated in terms of pair distribution function and the largest standard cluster analysis. It is found that Mo melt was cooled into a complex crystal with multiple characteristic lengths. Further analysis revealed that it is a mixture topological close packing (TCP) crystal composed of the dominated A15 phase (Mo-A15) and the less Z phase, with H phase as twin grain boundary. The Phonon spectrum, potential energy, and cohesion energy revealed that Mo-A15 is stable slightly inferior to Mo-bcc. Compared to the prevailing bcc Mo, Mo-A15 holds much higher Young’s modulus, ultimate tensile strength, and Yield strength, being a representative material for barrier layer with high hardness
SH wave structure of the crust and upper mantle in southeastern margin of the Tibetan Plateau from teleseismic Love wave tomography
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Lithospheric structure of the southeastern margin of the Tibetan Plateau from Rayleigh wave tomography
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