The supercritical fluid is used extensively, especially in substance extraction. The extraction of many substances has reached the economic-scale industrial bulk production stage. However, the research on the wastewat...The supercritical fluid is used extensively, especially in substance extraction. The extraction of many substances has reached the economic-scale industrial bulk production stage. However, the research on the wastewater-free dyeing technique replacing water as dissolvent is still at a development stage. This study introduced the development situation of supercritical fluid dyeing technique, and described the evolution of stock dyeing, measurement of solubility of dye, studies of dyeing kinetics and instrument application studies, in order to provide related data for relevant studies in further development of this technique.展开更多
Reactive dyes are the main dyes in printing and dyeing of cellulosic fibers.Reactive dyes fixation rate is a vital indicator to measure the degree of the covalent bond between cellulose and reactive dyes.However,the d...Reactive dyes are the main dyes in printing and dyeing of cellulosic fibers.Reactive dyes fixation rate is a vital indicator to measure the degree of the covalent bond between cellulose and reactive dyes.However,the determination of the fixation rate is tedious and time-consumptive.Based on the theory of reactive dyes dyeing and application of modern computer color matching technology,the relationship between K/S value and the fixation rate with the reactive dyes on cotton fabric was studied.The feasibility of K/S value instead of the traditional washing method for the determination of reactive dyes fixation rate was proved.In this study,the K/S value of the fabric has an excellent linear relationship to the reactive dyes fixation rate obtained by the washing method.The reactive dyes fixation rate can be obtained through the K/S correction value.展开更多
The effect of five dihydric alcohols on the fixation rate and K/S value of reactive dyes on cotton fabrics was investigated.Results show that the more primary hydroxyl groups are contained in the isomeric dihydric alc...The effect of five dihydric alcohols on the fixation rate and K/S value of reactive dyes on cotton fabrics was investigated.Results show that the more primary hydroxyl groups are contained in the isomeric dihydric alcohols,the greater activity of reacting with the reactive dye.Longer carbon chain also increases the reactivity of dihydric alcohols with reactive dyes.This study provides a theoretical basis for the selection of suitable dihydric alcohols in preparation reactive dye inkjet printing ink.展开更多
空间飞行器主要采用双频GPS精密定轨技术提高轨道预报精度,但需对双频GPS导航系统的观测数据进行预存储,为星载固存的存储资源增加负担;为此,文章提出了针对星载GPS观测数据的压缩方法,该方法引入稀疏表示理论,采用K奇异值分解(K-SVD,k-...空间飞行器主要采用双频GPS精密定轨技术提高轨道预报精度,但需对双频GPS导航系统的观测数据进行预存储,为星载固存的存储资源增加负担;为此,文章提出了针对星载GPS观测数据的压缩方法,该方法引入稀疏表示理论,采用K奇异值分解(K-SVD,k-singular value decomposition)字典学习方法构建出压缩字典,GPS导航系统将采集的观测数据时间序列稀疏分解到K-SVD压缩字典中,达到数据压缩目的;通过地面仿真验证,该方法不仅具有高压缩比、低失真率等特点,还能够降低GPS观测数据的噪声水平,从而提升了0.2~0.36 mm的精密定轨精度,并且该方法适合不同轨道高度的低轨飞行器应用。展开更多
文摘The supercritical fluid is used extensively, especially in substance extraction. The extraction of many substances has reached the economic-scale industrial bulk production stage. However, the research on the wastewater-free dyeing technique replacing water as dissolvent is still at a development stage. This study introduced the development situation of supercritical fluid dyeing technique, and described the evolution of stock dyeing, measurement of solubility of dye, studies of dyeing kinetics and instrument application studies, in order to provide related data for relevant studies in further development of this technique.
文摘Reactive dyes are the main dyes in printing and dyeing of cellulosic fibers.Reactive dyes fixation rate is a vital indicator to measure the degree of the covalent bond between cellulose and reactive dyes.However,the determination of the fixation rate is tedious and time-consumptive.Based on the theory of reactive dyes dyeing and application of modern computer color matching technology,the relationship between K/S value and the fixation rate with the reactive dyes on cotton fabric was studied.The feasibility of K/S value instead of the traditional washing method for the determination of reactive dyes fixation rate was proved.In this study,the K/S value of the fabric has an excellent linear relationship to the reactive dyes fixation rate obtained by the washing method.The reactive dyes fixation rate can be obtained through the K/S correction value.
文摘The effect of five dihydric alcohols on the fixation rate and K/S value of reactive dyes on cotton fabrics was investigated.Results show that the more primary hydroxyl groups are contained in the isomeric dihydric alcohols,the greater activity of reacting with the reactive dye.Longer carbon chain also increases the reactivity of dihydric alcohols with reactive dyes.This study provides a theoretical basis for the selection of suitable dihydric alcohols in preparation reactive dye inkjet printing ink.
文摘空间飞行器主要采用双频GPS精密定轨技术提高轨道预报精度,但需对双频GPS导航系统的观测数据进行预存储,为星载固存的存储资源增加负担;为此,文章提出了针对星载GPS观测数据的压缩方法,该方法引入稀疏表示理论,采用K奇异值分解(K-SVD,k-singular value decomposition)字典学习方法构建出压缩字典,GPS导航系统将采集的观测数据时间序列稀疏分解到K-SVD压缩字典中,达到数据压缩目的;通过地面仿真验证,该方法不仅具有高压缩比、低失真率等特点,还能够降低GPS观测数据的噪声水平,从而提升了0.2~0.36 mm的精密定轨精度,并且该方法适合不同轨道高度的低轨飞行器应用。
