In Situ Fabrication of TiO2/Bi3.64Mo0.36O6.55 Nanocomposite with High Visible-Light-Driven Photocatalytic Efficiency

Zhiyuan Yang,Junjie Wang,Lu Chen,Mengjun Liang,Yulin Xu,Chentao Zou,Xiaoxia Liu,Shuijin Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.5

In this work, we developed a simple hydrothermal method toward the fabrication of TiO2/ Bi3.64Mo0.36O6.55 heterostructure, which had superior photocatalytic performance for degrading of RhB under visible light irradiation. The as-prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), high-resolution transmission electron microscopy (HRTEM), UV-Vis diffuse reflectance spectroscopy (DRS) and photoelectrochemical measurements. The optimal composite with 15 wt.% TiO2/Bi3.64Mo0.36O6.55 (TBMO3) exhibits a much higher photocatalytic activity than that of Bi3.64Mo0.36O6.55 and P25 by degradation of RhB under visible light irradiation within 20 min. The enhanced performance of TBMO3 is predominantly attributed to the synergistic effect both in the higher surface area and the improved separation of photogenerated charge carriers between the two semiconductors. Recycling experiments indicated that TiO2/Bi3.64Mo0.36O6.55 photocatalysts had excellent cycle performance and stability. The photocatalytic mechanism of nanocomposite photocatalysts was proposed, which is confirmed by the active species trapping experiments and photoluminescence tests.

Variation in Nanofiber-Collection Location Depending on Process Variables for Centrifugal Spinning System

Yang, Seong Baek,Sabina, Yeasmin,Deng, Yulin,Yeum, Jeong Hyun American Scientific Publishers 2018 Nanoscience and Nanotechnology Letters Vol.10 No.8

Deformation behaviours of SS304 tubes in pulsating hydroforming processes

Lianfa Yang,Ninghua Wang,Yulin He 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.60 No.1

Tube hydroforming (THF) under pulsating hydraulic pressures is a novel technique that applies pulsating hydraulic pressures that are periodically increased to deform tubular materials. The deformation behaviours of tubes in pulsating THF may differ compared to those in conventional non-pulsating THF due to the pulsating hydraulic pressures. The equivalent stress-strain relationship of metal materials is an ideal way to describe the deformation behaviours of the materials in plastic deformation. In this paper, the equivalent stress-strain relationships of SS304 tubes in pulsating hydroforming are determined based on experiments and simulation of free hydraulic bulging (FHB), and compared with those of SS304 tubes in non-pulsating THF and uniaxial tensile tests (UTT). The effect of the pulsation parameters, including amplitude and frequency, on the equivalent stress-strain relationships is investigated to reveal the plastic deformation behaviours of tubes in pulsating hydroforming. The results show that the deformation behaviours of tubes in pulsating hydroforming can be well described by the equivalent stress-stain relationship obtained by the proposed method. The amplitude and frequency of pulsating hydraulic pressure have distinct effects on the equivalent stress-strain relationships-the equivalent stress becomes augmented and the formability is enhanced with the increase of the pulsation amplitude and frequency.

Surveillance of Antimicrobial Susceptibility Patterns among Shigella Species Isolated in China during the 7-Year Period of 2005-2011

Haifei Yang,Guosheng Chen,Yulin Zhu,Yanyan Liu,Jun Cheng,Li-Fen Hu,Ying Ye,Jia-Bin Li 대한진단검사의학회 2013 Annals of Laboratory Medicine Vol.33 No.2

Background: Shigella is a frequent cause of bacterial dysentery in the developing world. Treatment with antibiotics is recommended for shigellosis, but the options are limited due to globally emerging resistance. This study was conducted to determine the frequency and pattern of antimicrobial susceptibility of Shigella in China. Methods: We studied the antimicrobial resistance profiles of 308 Shigella spp. strains (260S. flexneri, 40 S. sonnei, 5 S. boydii, and 3 S. dysenteriae) isolated from fecal samples of patients (age, from 3 months to 92 yr) presenting with diarrhea in different districts of Anhui,China. The antimicrobial resistance of strains was determined by the agar dilution method according to the CSLI guidelines. Results: The most common serogroup in the Shigella isolates was S. flexneri (n=260, 84.4%),followed by S. sonnei (n=40, 13.0%). The highest resistance rate was found for nalidixic acid (96.4%), followed by ampicillin (93.2%), tetracycline (90.9%), and trimethoprim/sulfamethoxazole (80.8%). Among the isolates tested, 280 (91.0%) were multidrug resistant (resistant to ≥2 agents). The most common resistance pattern was the combination of ampicillin,tetracycline, and trimethoprim/sulfamethoxazole (70.8%). Resistance to ampicillin and tetracycline were more common among S. flexneri than among S. sonnei isolates. Conclusions: S. flexneri is predominant in Anhui, China, and its higher antimicrobial resistance rate compared with that of S. sonnei is a cause for concern. Continuous monitoring of resistance patterns is necessary to control the spread of resistance in Shigella. The recommendations for antimicrobial treatment must be updated regularly based on surveillance results.

Molecular mapping of four blast resistance genes using recombinant inbred lines of 93-11 and nipponbare

Hongmei Yang,Melissa H Jia,Yulin Jia,Junjie Xing,Venu, R-C,Maria Bellizzi,Longping Yuan,Zhilong Wang,Chuanqing Sun,Guo-Liang Wang 한국식물학회 2013 Journal of Plant Biology Vol.56 No.2

Molecular mapping of new blast resistance genes is important for developing resistant rice cultivars using marker-assisted selection. In this study, 259 recombinant inbred lines (RILs) were developed from a cross between Nipponbare and 93-11, and were used to construct a 1165.8-cM linkage map with 131 polymorphic simple sequence repeat (SSR) markers. Four major quantitative trait loci (QTLs) for resistance to six isolates of Magnaporthe oryzae were identified: qPi93-1, qPi93-2, qPi93-3, and qPiN-1. For the three genes identified in 93-11, qPi93-1 is linked with SSR marker RM116 on the short arm of chromosome 11 and explains 33% of the phenotypic variation in resistance to isolate CHE86. qPi93-2 is linked with SSR marker RM224 on the long arm of chromosome 11 and accounts for 31% and 25% of the phenotypic variation in resistance to isolates 162-8B and ARB50, respectively. qPi93-3 is linked with SSR marker RM7102 on chromosome 12 and explains 16%, 53%, and 28% of the phenotypic variation in resistance to isolates CHE86, ARB52, and ARB94, respectively. QTL qPiN-1 from Nipponbare is associated with SSR marker RM302 on chromosome 1 and accounts for 34% of the phenotypic variation in resistance to isolate PO6-6. These new genes can be used to develop new varieties with blast resistance via marker-aided selection and to explore the molecular mechanism of rice blast resistance.

Organic Montmorillonite/Polyethersulfone/Polytetrafluoroethylene Ternary Nanocomposites: Characterization and Tribological Performance in Dry Sliding Condition

Zhen Zuo,Yulin Yang,Pengtao Yan,Laizhou Song,Xin Jin 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6

Polyethersulfone (PES)/polytetrafluoroethylene (PTFE) based composite were prepared with the nanofiller oforganic montmorillonite (OMMT). Compared with original OMMT, the interlayer spacing of OMMT in nanocomposites wasdecreased from 3.47 nm to 1.35 nm, attributing to the decomposition of interlayer quaternary ammonium salt. OMMTnanofiller was favorable to improve the thermal stability and abrasion resistance of PES/PTFE compounds. The preferablewear property of OMMT/PES/PTFE composite was mainly ascribed to the load bearing capacity of OMMT on the wornsurface of polymer composites. The OMMT/PES/PTFE compound with 10 wt% OMMT exhibited the lowest wear rate,owing to its densification morphology. Because of the absence of PTFE transfer film, the friction coefficient of OMMT/PES/PTFE compound with 10 wt% OMMT were higher than those of PTFE and PES/PTFE compounds.

Effect of sodium gluconate on dispersion of polycarboxylate superplasticizer with different grafting density in side chain

Fubing Zou,Hongbo Tan,Yulin Guo,Baoguo Ma,Xingyang He,Yang Zhou 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.55 No.-

Sodium gluconate is a commonly used retarder, and the incorporation of SG has been accepted as the most efficient way to improve the basic performance of polycarboxylate superplasticizer (PCE) system in real concrete. However, this improvement cannot be always achieved, and the main reason for this uncertainty is because the interaction between PCE and SG has not completely understood. In order to gain deeper insight into this interaction, adsorption behavior and dispersion mechanism of PCE-SG system involved in two kinds of PCE with different grafting density of carboxyl groups in side chain have been investigated. Specifically, the dispersion was assessed with the fluidity of the cement paste, and adsorption behavior was estimated with total organic carbon and zeta potential. The combination between PCE and SG was characterized with conductivity, dynamic light scattering, and X-ray photoelectron spectroscopy. Finally, several models were proposed to illustrate the mechanism behind. The results show that gluconate grafted as side chain of PCE and the increase in length of PEO chain caused by addition of SG can provide contribution to dispersion. Competitive adsorption between SG and PCE would take place to reduce the dispersion, and the declining degree depends on the relative adsorption between PCE and SG. Dispersion of PCE-SG is not only dependent on added dosage of SG, but also decided by molecular structure of PCE. This result provides guidance on how to promote the basic performance of the PCE-retarder system in real engineering practice.

Distribution of Phytic Acid and Associated Catabolic Enzymes in Soybean Sprouts and Indoleacetic Acid Promotion of Zn, Fe, and Ca Bioavailability

Xinkun Wang,Runqiang Yang,Xiaolin Jin,Yulin Zhou,Yongbin Han,Zhenxin Gu 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.6

Phytic acid is involved in storage of phosphorus and minerals in soybeans. The effects of 6 basic plant hormones on phytic acid degradation were investigated. After 6 days of germination, phytic acid contents in soybean sprouts decreased by 70%, compared with day 0 soybeans. Zn and Fe bioavailability of 6-day-old germinating soybean both significantly increased (p<0.05), by contrast, Ca bioavailability decreased compared with controls. Phytic acid was detectable only in cotyledons of soybean sprouts during germination. In germinating soybeans, 39.19-45.85% and 54.15-60.81% of phytase existed in embryos and cotyledons, respectively. Unlike phytase, acid phosphatase was present mainly in cotyledons (92.57-97.51%). Among the 6 hormones, 50 mg/L indoleacetic acid (IAA) brought the highest degradation value to phytic acid content, meanwhile, Zn, Fe, and Ca bioavailability of IAA-treated soybeans were significantly (p<0.05) improved, compared with that of the control, respectively.

Effect of Germination and Incubation on Zn, Fe, and Ca Bioavailability Values of Soybeans (Glycine max L.) and Mung Beans (Vigna radiate L.)

Xinkun Wang,Runqiang Yang,Xiaolin Jin,Zhijie Chen,Yulin Zhou,Zhenxin Gu 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.5

Phytase/phosphatase activities, the phytic acid content, and Zn, Fe, and Ca bioavailability values of 4-d-germinated soybeans and mung beans were investigated. Phytase and phosphatase activities of germinated soybeans and mung beans both increased, compared with raw beans. The phytic acid contents declined in germinated soybeans by 57.5% and in mung beans by 76.0%. Zn and Fe bioavailability values increased in germinated beans and Ca bioavailability decreased. For incubation, the highest bioavailability values of Zn, Fe, and Ca, respectively, were achieved using an exogenous phytase treatment in mung beans (47.6, 44.6, and 51.5%). Soybeans exhibited values of 64.7, 60.6, and 47.9%, respectively, after a combined treatment with endogenous and exogenous phytases. Germination improves Zn and Fe bioavailability values of beans by increasing enzyme activity, but is time-consuming. Incubation is more efficient for improvement of Zn, Fe, and Ca bioavailability values in a short period of time.

A new thinning-based INAR(1) process for underdispersed or overdispersed counts

Kang Yao,Wang Dehui,Yang Kai,Zhang Yulin 한국통계학회 2020 Journal of the Korean Statistical Society Vol.49 No.2

Underdispersed and overdispersed phenomena are often observed in practice. To deal with these phenomena, we introduce a new thinning-based integer-valued autoregressive process. Some probabilistic and statistical properties of the process are obtained. The asymptotic normality of the estimators of the model parameters, using conditional least squares, weighted conditional least squares and modified quasi-likelihood methods, are presented. One overdispersed real-data example and one underdispersed real-data example are given to show the flexibility and superiority of the new model.