No abstract

One-pot method for the preparation of wellordered periodic mesoporous ethylenesilica functionalized in-situ with sulfonic groups (pr-SO 3 H-PMO) was deployed successfully. The sulfonic groups have been used as a Brønsted acid to catalyze the carbon-carbon coupling reaction of α-electron-withdrawing group (EWG) ketene dithioacetal derivatives and benzhydrol. Meanwhile, this series of materials exhibit excellent catalytic performance in the CÀ C coupling reaction and pr-SO 3 H-PMO(0.39) possesses highly efficient catalytic performance among the prepared materials, over which the conversion of ketene dithioacetals achieved 98.3% and the yield of the coupling products reached 93.4%. In addition, evidence is presented that the catalytic activity of pr-SO 3 H-PMO(0.39) material has been recycled up to five times without a significant reduction.

In this paper, a special 6-PUS parallel manipulator (PM) is utilized as a shaking table. Unlike the existing results about 6-PUS PMs, we make the actuator direction collinear with the linkage direction at neutral position. With respect to the application background, a further analysis of the special PM is carried out from the perspective of motion/force transmissibility, natural frequency and acceleration capability. Specially, the complete dynamics model is established based on the Kane method. Then, generalized transmission indices based on the screw theory are utilized to reflect its motion ability, and a model of natural frequency is proposed with the axial stiffness of linkages considered. Finally, the effect of the angle between the actuator direction and the linkage direction α on various performances is analyzed, and other results are included to illustrate its feasibility and usability.

Using natural dye Ginkgo leaves as raw materials, the dye liquid was extracted by microwave method, water bath method and ultrasonic extraction method, and the suck photometric of this three extraction liquid were tested. The 25 tex cannabis/mulberry fiber/wool 60/20/20 blended yarn was dyed by the extracted liquid. The four factors of pH value, dyeing temperature, mordant dosage, and penetration agent dosage were used to analyze dyeing effect. On the basis of the above four factors, three level of orthogonal experiment was designed to dye the blended yarn, the color fastness of the orthogonal samples were tested. The results showed that the absorbance of the pigment extracted by microwave-assisted extraction method was the highest, and the best dying techniques as: osmotic dosage of 1.5ml, and mordant 15ml dye pH 10, dyeing temperature of 60 degrees centigrade. The color fastness and wet fastness cannabis/mulberry fiber blended yarn after dyeing achieve level 3 or above.