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Antibacterial and Hydrophilic Modification of PET Fabrics by Electron Beam Irradiation Process
Shumin Zhang,Fang Ding,Yingfeng Wang,Xuehong Ren,Tung-Shi Huang 한국섬유공학회 2020 Fibers and polymers Vol.21 No.5
Electron beam (EB) irradiation has been utilized to modify materials for various applications due to its remarkableadvantages. As an efficient and environmental-friendly way for antibacterial and hydrophilic purposes, EB irradiation wasapplied to modify polyethylene terephthalate (PET) fabrics by grafting with a N-halamine precursor monomer 3-allyl-5,5-dimethylhydantoin (ADMH) and acrylic acid (AA) in this study. The grafted PET fabrics were loaded with silver ions tofurther enhance the antimicrobial efficacy. The hydrophilicity of the modified PET fabrics was evaluated by testing the watercontact angles with different contact times. The breaking strength and thermal stability of the modified swatches werestudied. The UVA light stability results showed the chlorine loading of the modified PET fabrics decreased with the extensionof UVA exposure time, and most chlorine loading could be recovered by re-chlorination. The antibacterial test showed thatthe modified PET swatches can inactivate all inoculated S. aureus and E. coli with short contact times.
Shumin Zhang,Fang Ding,Zhiguang Li,Xuehong Ren,Tung-Shi Huang 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10
The numerous functional groups and dendritic structure of hyperbranched polymers render them for a wide rangeof applications. In this study, hyperbranched polymer Boltorn H20, containing abundant hydroxyl groups, was modified toprepare quaternary ammonium functionalized hyperbranched polymers, QAS-HPs. The synthesized QAS-HPs were coatedon polyethylene terephthalate (PET) fabrics by electron beam radiation. The PET fabrics were endowed antimicrobial andhydrophilic properties after modification. The water contact angles of the modified PET fabrics were tested, and the resultsshowed significant improvement in hydrophilicity. The results of antibacterial efficacy tests showed that the modified PETfabrics could inactivate 100 % of Staphylococcus aureus (S.aureus) and 90.8 % of Escherichia coli O157:H7 (E. coliO157:H7) with 30 min of contact time.
Decision diagram based methods and reliability analysis for k-out-of-n: G systems
Shumin Li,Shudong Sun,Shubin Si,Shuai Zhang,Hongyan Dui 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10
Binary k-out-of-n systems are commonly used reliability models in engineering practice. Many authors have extended the concept ofk-out-of-n system to multi-state k-out-of-n systems. This paper proposes a binary decision diagram (BDD) based approach for binary kout-of-n: G system and a multi-state multi-valued decision diagram (MMDD) based approach for multi-state k-out-of-n: G system. BDDand MMDD have been extensively used for representing and manipulating logic functions in many areas, including reliability modelingand analysis. In this paper, patterns of BDD/MMDD for binary/multi-state k-out-of-n: G system are summarized and proved, a two-stepalgorithmic process is proposed for modeling the BDD/MMDD and three case studies are implemented to demonstrate the presentedmethods. Complexity analysis shows that the presented method is more computationally efficient than the traditional algorithms for kout-of- n: G system.
Wang Shumin,Dong Kaiye,Zhang Ji,Chen Chaochao,Shuai Hongyan,Yu Xin 한국영양학회 2023 Nutrition Research and Practice Vol.17 No.6
BACKGROUND/OBJECTIVES: Inonotus obliquus has been used as antidiabetic herb around the world, especially in the Russian and Scandinavian countries. Diabetes is widely believed to be a key factor in Alzheimer’s disease (AD), which is widely considered to be type III diabetes. To investigate whether I. obliquus can also ameliorate AD, it would be interesting to identify new clues for AD treatment. We tested the anti-AD effects of raw Inonotus obliquus polysaccharide (IOP) in a mouse model of AD (3×Tg-AD transgenic mice). MATERIALS/METHODS: SPF-grade 3×Tg-AD mice were randomly divided into three groups (Control, Metformin, and raw IOP groups, n = 5 per group). β-Amyloid deposition in the brain was analyzed using immunohistochemistry for AD characterization. Gene and protein expression of pertinent factors of the ubiquitin-proteasome system (UPS) was determined using real-time quantitative polymerase chain reaction and Western blotting. RESULTS: Raw IOP significantly reduced the accumulation of amyloid aggregates and facilitated UPS activity, resulting in a significant reduction in AD-related symptoms in an AD mouse model. The presence of raw IOP significantly enhanced the expression of ubiquitin, E1, and Parkin (E3) at both the mRNA and protein levels in the mouse hippocampus. The mRNA level of ubiquitin carboxyl-terminal hydrolase isozyme L1, a key factor involved in UPS activation, also increased by approximately 50%. CONCLUSIONS: Raw IOP could contribute to AD amelioration via the UPS pathway, which could be considered as a new potential strategy for AD treatment, although we could not exclude other mechanisms involved in counteracting AD processing.
Qiang Cao,Shumin He,Yuanyuan Deng,Dapeng Zhu,Xiaodong Cui,Guolei Liu,Huai-Jin Zhang,Shishen Yan,Yanxue Chen,Liangmo Mei 한국물리학회 2014 Current Applied Physics Vol.14 No.5
Raman scattering spectroscopy has been performed on high quality Co-doped ZnO epitaxial films, which were grown on Al2O3 (0001) by oxygen-plasma assisted molecular beam epitaxy. Raman measurements revealed two local vibration modes (LVMs) at 723 and 699 cm1 due to the substitution of Co2þ in wurtzite ZnO lattice. The LVM at 723 cm1 is found to be an elemental sensitive vibration mode for Co substitution. The LVM at 699 cm1 can be attributed to enrichment of Co2þ bound with oxygen vacancy, the cobalteoxygen vacancyecobalt complexes, in Zn1xCoxO films associated with ferromagnetism. The intensity of LVM at 699 cm1, as well as saturated magnetization, enhanced after the vacuum annealing and depressed after oxygen annealing.
Xin Zhao,Dandan Ke,Shumin Han,Yuan Li,Hongming Zhang,Ying Cai 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.11
By adding surfactant polyvinyl alcohol (PVA) and controlling the preparation process, we successfully synthesized Co–Mo catalysts. For further improving the dispersion, reduced graphene oxide sheets as catalyst carrier were introduced to synthesize Co–Mo@rGO composite catalyst as highly efficient catalysts for hydrolytic dehydrogenation of ammonia borane. The introduction of Mo for preparing Co–Mo@rGO catalyst helped to form alloy catalyst with better structure, better dispersity and smaller particle size. When the molar ratio of Co and Mo was 0.75 : 0.25, the bimetallic composite catalyst exhibited superior activity with TOF value of 16.29 mol H2 · min -1 · mol Co-Mo -1. The activation energy of the reaction was calculated to be 43.72 kJ · mol -1. Furthermore, the reusability tests reveal that waxberry-like Co–Mo still show good catalytic activity with 80.3 % of their initial activity in five successive runs. The enhanced catalytic activities were due to the synergistic interaction between graphene sheets and waxberry-like Co–Mo NPs, which was beneficial to improve the dispersion and stability of bimetallic NPs. Also, ligand effects on the formation of waxberry-like structure and amorphous state further promoted the catalytic activity.
Optimal Timing Control of Discrete-Time Linear Switched Stochastic Systems
Xiaomei Liu,Kanjian Zhang,Shumin Fei,Haikun Wei,Shengtao Li 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.4
Optimal switch-time control is the study that investigates how best to switch between different modes. In this paper, we investigate the optimal switch-time control problem for discrete-time linear switched stochastic systems. In particular, under the assumption that the sequence of active subsystems is pre-specified, we focus on the problem where the objective is to minimize a cost functional defined on the states and the switching times are the only control variables. For systems with one switching time, using calculus of variations, we firstly derive the difference formulae of the cost functional with respect to the switching time, which can be directly used to find the optimal switching instant. Then, a method is presented to deal with the problem with multiple switching times case. Finally, the viability of the proposed method is illustrated through two numerical examples.
Zheng Liu,Shuangcheng Gao,Shumin Zhang,Shangjun Yang,Ning Sun 한국유전학회 2014 Genes & Genomics Vol.36 No.1
An RNAi construct for silencing FtsZ genefunctioning on plastid division in higher plants was transformedinto tobacco genome. Sequencing of the flankingsequences of the T-DNA insertion site in a positive transgenicplant 2-3, which showed wildtype phenotype,revealed that the construct had rearranged, resulting inconvergent transcription of nptII gene by 35S promoter andnos promoter with both transcripts expressing at low level. Although it is possible that the sense and antisense transcriptscan form dsRNA, they did not trigger silencing ofnptII gene derived from a FtsZ silenced plant 2-12 in thecrossed plant 2-392-12. Furthermore, although smallinterfering RNA can trigger DNA methylation of thesilencing locus, our investigation revealed that the crossedplant 2-392-12 showed partial methylation of the nonsilencingtransgene locus but full methylation of the nonrearrangedsilencing locus, suggesting that the efficiency ofRNA-directed DNA methylation is associated with itsoriginal DNA locus.
Jinzhen Ma,Liyuan Hou,Ping Li,Shumin Zhang,Xiangyu Zheng 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.2
To explore cheap, easily available and high adsorption performance bioadsorbent is still an important task for azo dye pollution control. In this study, the Methyl orange (MO) adsorption capacity by a novel bioadsorbent obtained from lychee and longan pericarps via simple modification was investigated. Prepared pericarps were modified by PEI at 30˚C and 65˚C, which improved the adsorption performance confirmed by batch adsorption experiments. The characteration of modified pericarps by X-ray diffraction, scanning electron microscopy and zeta potential indicated that the enhanced adsorption performance may be due to the abundant amines and imines and stronger electropositivity. The maximum adsorption capacity (349.37 mg/g) was observed for LC@PEI-65 at 45˚C and pH 4. Freundlich isotherm model fitted pretty well with the isotherm experiment data, and the isotherm experimental data were preferably described by pseudo-second order model indicating the chemical adsorption process, and the intra-particle diffusion also involved in the adsorption process. Characterization and adsorption tests suggested electrostatic interaction played a key role in MO removal, accompanied by intermolecular hydrogen bond, π-π dispersion interaction and pore filling collectively. The present study show that the cost-effective PEI modified pericarps could possess a hopeful application for azo dye removal from wastewater.