将钇稳定氧化锆(3Y-PSZ)冷等静压素坯在原位测量仪中进行恒速无压烧结,升温速率分别为2、5、8℃/min,通过原位测量仪保存图像,并用软件Image-Pro Plus 6.0对图像进行处理,得到收缩数据,建立氧化锆的控制烧结曲线(MSC),成功计算出其烧结...将钇稳定氧化锆(3Y-PSZ)冷等静压素坯在原位测量仪中进行恒速无压烧结,升温速率分别为2、5、8℃/min,通过原位测量仪保存图像,并用软件Image-Pro Plus 6.0对图像进行处理,得到收缩数据,建立氧化锆的控制烧结曲线(MSC),成功计算出其烧结活化能Q为685.7 k J/mol。并对控制烧结曲线进行扩展(EMSCE),模拟出恒定加热速率下整个烧结过程中温度与相对密度的关系,而不仅仅是预测最终密度。该研究提供了一种预测材料烧结制度的可能性,确保了所选烧结时间和烧结温度的高精确度和可重复性。展开更多
Short-wavelength near infrared spectroscopy (SW-NIR) is a very rapid, versatile and precise technique, which can be used in many different situations and for very types of products and chemical compounds. Extended mul...Short-wavelength near infrared spectroscopy (SW-NIR) is a very rapid, versatile and precise technique, which can be used in many different situations and for very types of products and chemical compounds. Extended multiplicative signal correction (EMSC) is a modification of the standard MSC pre-processing method that allows the separation of physical light scattering effects from chemical (vibrational) light absorbance effects in spectra. In this paper, the EMSC is applied and compared with first derivate, second derivate, MSC and SNV in combination of PLSR to obtain robust models in terms of accuracy and predict ability with a reduced calibration data set using SW-NIR spectra of moisture in marzipan. The Extended Multiplicative Signal Correction—EMSC and combination methods provide the best results in terms of prediction ability and calibration SW-NIR spectra of moisture in marzipan. The best classification results were obtained by Extended Multiplicative Signal Correction followed by second derivates.展开更多
文摘目的:构建具有定向多通道的纤维蛋白支架,并探究该支架对外胚层间充质干细胞(ecto-mesenchymal stem cells,EMSCs)的生长行为及向神经分化的影响,为其用于脊髓损伤修复提供新思路。方法:通过人工造孔和冷冻干燥技术构建具有定向多通道的纤维蛋白支架,扫描电子显微镜(scanning electron microscope,SEM)观察支架内微观结构。大鼠鼻粘膜来源的EMSCs与该支架复合培养7d,倒置荧光显微镜和SEM评估该支架对EMSCs迁移的引导效果,并通过免疫荧光染色技术鉴定其对EMSCs向神经诱导分化的程度。结果:(1)SEM显示支架横截面上有若干通道空洞,支架纵截面显示通道的走向基本与支架长轴一致;(2)EMSCs粘附在定向通道的孔壁上,且沿着支架纵轴的方向延伸;(3)免疫荧光染色显示神经相关蛋白阳性。结论:EMSCs在定向多通道纤维蛋白支架上能够正常生长,且支架的定向多通道对其生长具有引导作用,利于EMSCs的粘附、迁移和向神经方向分化。
文摘将钇稳定氧化锆(3Y-PSZ)冷等静压素坯在原位测量仪中进行恒速无压烧结,升温速率分别为2、5、8℃/min,通过原位测量仪保存图像,并用软件Image-Pro Plus 6.0对图像进行处理,得到收缩数据,建立氧化锆的控制烧结曲线(MSC),成功计算出其烧结活化能Q为685.7 k J/mol。并对控制烧结曲线进行扩展(EMSCE),模拟出恒定加热速率下整个烧结过程中温度与相对密度的关系,而不仅仅是预测最终密度。该研究提供了一种预测材料烧结制度的可能性,确保了所选烧结时间和烧结温度的高精确度和可重复性。
文摘Short-wavelength near infrared spectroscopy (SW-NIR) is a very rapid, versatile and precise technique, which can be used in many different situations and for very types of products and chemical compounds. Extended multiplicative signal correction (EMSC) is a modification of the standard MSC pre-processing method that allows the separation of physical light scattering effects from chemical (vibrational) light absorbance effects in spectra. In this paper, the EMSC is applied and compared with first derivate, second derivate, MSC and SNV in combination of PLSR to obtain robust models in terms of accuracy and predict ability with a reduced calibration data set using SW-NIR spectra of moisture in marzipan. The Extended Multiplicative Signal Correction—EMSC and combination methods provide the best results in terms of prediction ability and calibration SW-NIR spectra of moisture in marzipan. The best classification results were obtained by Extended Multiplicative Signal Correction followed by second derivates.
