Tertiary Amination/Hydroxypropylsulfonation of Cornstarch to Improve the Adhesion-to-Fibers and Film Properties for Warp Sizing

Wei Li,Zhenzhen Xu,Zongqian Wang,Changlong Li,Quan Feng,Yanan Zhu 한국섬유공학회 2018 Fibers and polymers Vol.19 No.7

To investigate the effects of tertiary amination/hydroxypropylsulfonation on the adhesion-to-fibers and film properties of corn starch for warp sizing, a series of tertiary aminated and hydroxypropylsulfonated corn starch (TAHPSS) samples were prepared by the tertiary amination and hydroxypropylsulfonation of acid-hydrolyzed corn starch (AHS) with 2- dimethylaminoethyl chloride hydrochloride (DMC-HCl) and 3-chloro-2-hydroxy-1-propanesulfonic acid sodium salt (CHPS-Na) simultaneously. The adhesion was evaluated by measuring the bonding force of starch to the fibers. The film properties were investigated in terms of tensile strength, breaking elongation, degree of crystallinity, and moisture regain. The results showed that tertiary amination/hydroxypropylsulfonation was able to increase bonding forces of starch to cotton and polyester fibers, enhance breaking elongation and moisture regain of the starch film and to decrease the tensile strength and degree of crystallinity of the film, thereby improving the adhesion and reducing film brittleness. Increasing the level of tertiary amination/hydroxypropylsulfonation was favorable for gradually improving the adhesion and decreasing the brittleness. The TAHPSS showed potential for use in cotton warp sizing.

Effect of naphthalene quinoline and H2S on DBT hydrodesulfurization over unsupported NiMoW catalyst

Changlong Yin,Haonan Zhang,Tongtong Wu,Zhuyan Wu,Kunpeng Li,Yan Kong,Chengwu Dong,Chenguang Liu 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.12

Unsupported catalysts have attracted much attention for high activity in comparison with the traditional supported catalyst. Meanwhile, the clear structure of unsupported catalysts is helpful for the recognition of active phase for conducting the industry production. The NiMoW unsupported catalyst was prepared by hydrothermal synthesis and characterized by BET, XRD and HRTEM. The effects of naphthalene, quinoline and H2S on the hydrodesulfurization reactivity of dibenzothiophene (DBT) were investigated in both a batch autoclave and a continuous 10 ml fixed bed micro-reactor over NiMoW and supported catalyst for comparison. The results showed that the hydrogenation reaction and the hydrogenolysis reaction occurred on different active sites. For supported catalyst, the inhibition was relatively weaker, and the inhibition of the hydrodesulfurization pathway was much higher than the direct desulfurization pathway. Although unsupported catalyst was very sensitive to quinoline and H2S in this experiment, the HDS ratio on the unsupported catalyst was maintained at a high level above 99.7%, which is attributed to the very high active site density of unsupported catalysts.

Identifification and development of a core set of informative genic SNP markers for assaying genetic diversity in Chinese cabbage

Peirong Li,Tongbing Su,Shuancang Yu,Huiping Wang,Weihong Wan,Yangjun Yu,Deshuang Zhang,Xiuyun Zhao,Changlong Wen,Fenglan Zhang 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.3

Rapid, economical, and reliable genotyping is an important requirement for germplasm analysis and cultivar identifi cationin crop species. Chinese cabbage ( Brassica rapa L. subsp. pekinensis (Lour.) Hanelt) originated in China and is now aneconomically important vegetable crop worldwide, especially in East Asia. In this study, we evaluated 1167 single nucleotidepolymorphisms (SNPs) among 166 representative Chinese cabbage inbred lines using a KASP genotyping assay. Onthe basis of polymorphisms and principal component analysis, we selected 60 core SNPs distributed on all Brassica rapachromosomes with allele frequencies suffi ciently balanced so as to provide adequate information for genetic identifi cation. The core set of SNPs was used for construction of a neighbor-joining dendrogram, in which the 166 inbred lines wereclustered into spring, summer, and autumn ecotype groups. Clustering of the ecotype groups was better resolved than thatachieved with 1167 and 360 polymorphic SNP datasets. Stability and resolution of the core SNP markers were tested using178 commercial hybrid Chinese cabbage cultivars to confi rm their utility in genetic identifi cation. The set of 60 informativeand stable SNP markers showed high discriminatory power and relatively uniform genomic distribution (4–9 markers perchromosome). The SNPs represent a cost-effi cient and accurate marker set for germplasm analysis and cultivar identifi cationand are suitable for molecular marker-assisted breeding in Chinese cabbage.

Accuracy modeling, analysis and radical error distribution of 3-RPR planar parallel mechanism

Jian Ding,Changlong Ye,Suyang Yu,Jianguang Li,Jinguo Liu,Guangbo Hao 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.11

Output accuracy performance is directly determined by geometric errors and working poses of a mechanism. Accuracy sensitivity as geometric error transmission coefficient, closely relates to pose configuration and geometric parameters. This research focuses on accuracy of a 3-RPR planar parallel mechanism: firstly, established 3 models in an analytic form, to describe relationship between output errors and geometric ones, then they are mutually verified statistically. Secondly, the anisotropy and periodic fluctuation of position errors, independently contributed by each category of geometric errors, are illustrated; and mirror symmetric trajectories and poses generating output errors with mirror symmetry, are also revealed by numerical simulation. Finally, the radical accuracy model in an analytic form, was established through variance and covariance analysis on output errors. We concluded that the radical error of the movable platform in central symmetric poses, follows Rayleigh distribution pattern. Through statistical comparison with Monte Carlo simulation, the radical error model was demonstrated, that provided a reference for accuracy design for other planar parallel mechanism.

1-Aminoanthraquinone Diazonium Salt on the Coupling Modification Dyeing of Silk Fibroin with Enhanced Color Fastness

Zongqian Wang,Changlong Li,Hulin Zhang,Zhi Liu 한국섬유공학회 2018 Fibers and polymers Vol.19 No.10

Chromophore incorporated into the protein chains through residue modification on silk fibroin will be an important way to get new dyeing technology with improved color fastness. Herein, 1-aminoanthraquinone diazonium salt was prepared and used for the modified dyeing on tyrosine of silk fibroin. The silk after modified dyeing was measured by UV-Vis, FTIR, MS, 1H-NMR, Data color, and other testing techniques. Interestingly, the resulting silk showed excellent rub and wash fastness. The enhanced color fastness is contributed by an electrophilic substitution reaction between 1- aminoanthraquinone diazonium salt and the ortho position of phenolic hydroxyl in tyrosine molecular. Moreover, the mechanical property of silk was protected effectively by the mild coupling modified dyeing, better than the traditional acid dyeing under high temperature for a long time. This facile strategy provides an alternative approach to silk dyeing and benefits the silk applications.

Fuzzy adaptive PID control method for multi-mecanum-wheeled mobile robot

Guoqiang Cao,Xinyu Zhao,Changlong Ye,Suyang Yu,Bangyu Li,Chunying Jiang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.4

Mecanum-wheeled mobile robots are widely used because they can easily realize omnidirectional movement and have flexible movement characteristics. However, existing mecanum-wheeled robots generally have problems of low movement accuracy and poor stability. Structural optimization method can improve the movement accuracy and stability of mecanum-wheeled robots, but it cannot solve the problem fundamentally. In this study, the method of geometric modeling is applied to deduce the parameters kinematic error e, slip factor μ, and overturning angle λ, all of which have an effect on the movement accuracy and stability of the robot. Combined with the advantages of PID and fuzzy control, a fuzzy adaptive PID control method is proposed. The experimental prototype of the eight-mecanum-wheeled omnidirectional mobile robot is built to carry out the trajectory tracking control experiment, and the superiority in the fuzzy adaptive PID control method is verified.

라인 페어 검색 기반 지문인식 알고리즘

김원진(WeonJin Kim),김장룡(Changlong Jin),이경수(Qiongxiu Li),김정민(JungMin Kim),김학일(Hakil Kim) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6

Line pair search based fingerprint matching algorithm is aimed at finding the corresponding pattern between probe image and gallery image based on the line pair search in the candidate line pairs which share similar length and orientation difference. The advantage of line pair search based fingerprint matching algorithm is the improvement of colp based on the one in Bozorth3, new colp structure contains less candidates which can save searching time and apply efficient search. The minutiae screening in the beginning can make sure the robustness of the minutiae, which is of great importance to the accuracy and also the processing time.

Durable Antibacterial and UV Protective Properties of Cotton Fabric Coated with Carboxymethyl Chitosan and Ag/TiO2 Composite Nanoparticles

Qingbo Xu,Peng Wang,Yanyan Zhang,Changlong Li 한국섬유공학회 2022 Fibers and polymers Vol.23 No.2

Immobilizing inorganic particles such as zinc oxide (ZnO), titanium dioxide (TiO2), silver nanoparticles (Ag NPs)or grafting special biopolymer such as chitosan on cotton fabrics is the main method to prepare antibacterial and ultraviolet(UV) protective cotton fabrics. However, poor durability and complex finishing methods are still of the main defects ofantibacterial and UV protective fabric samples. In the present work, the Ag/TiO2 colloid solution was prepared with using thecarboxymethyl chitosan (CMC) as a stabilizer, then the CMC and Ag/TiO2 composite nanoparticles were coated on the fabricvia finishing technology of pad-dry-cure. As a result, the modified fabric showed excellent antibacterial and UV protectiveproperties, with the values of bacterial reduction (BR) and ultraviolet protection factor were reached at 99.5 % and 79.0,respectively. Moreover, even after 50 washing cycles, these properties of the finished fabrics were not obviously reduced. These results demonstrated that the finished fabric sample has durable antibacterial and UV protective properties which couldhas a great potential application in the field of medical and outdoor apparel.