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Lingling Ren,Huimin Gu,Wei Wang,Shuai Wang,Chengde Li,Zhenbiao Wang,Yuchun Zhai,Peihua Ma 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.1
Despite showing considerable potential, wire arc additive manufacturing (WAAM) has been limited to producing Al–Mgalloys. As the addition of Sc can improve the mechanical properties of Al–Mg alloys, in this study, Al–Mg–Sc alloy depositswith different Sc contents were prepared by a WAAM process. The porosity, microstructure, and mechanical properties ofthe deposits were studied. At Sc contents less than 0.15%, Sc was completely dissolved in the Al matrix without grain refinement,and the mechanical properties were slightly improved. At a Sc content of 0.3%, the primary Al3Scphase precipitatedout of the as-deposited body, resulting in an abrupt change in the microstructure, significant grain refinement, significantlyincreased tensile strength and yield strength, with a tensile strength, yield strength, and elongation of 372 MPa, 270 MPa,and 22.5%, respectively. Following heat treatment at 350 °C for 1 h, the grain boundaries were refined and the secondaryAl3Scphase was precipitated. Furthermore, the tensile strength and yield strength were significantly increased to 415 MPaand 279 MPa, respectively, and elongation decreased to 18.5%. At a Sc content of 0.45%, due to the aggregated precipitatedphase, the coarsened grain boundaries and the limited solid solution amount of Sc in the α(Al) matrix (~ 0.25%), themechanical properties were not further improved compared with the deposit with Sc content of 0.3%. Thus, based on economicconsiderations, the optimal Sc content was 0.3%. Owing to their enhanced mechanical properties, WAAM-producedAl–Mg–Sc alloys are expected to have a wide range of applications in aviation, aerospace.
Eco-friendly Grafting of Chitosan as a Biopolymer onto Wool Fabrics Using Horseradish Peroxidase
Lingling Xu,Nan Zhang,Qiang Wang,Jiugang Yuan,Yuanyuan Yu,Ping Wang,Xuerong Fan 한국섬유공학회 2019 Fibers and polymers Vol.20 No.2
Chitosan and enzymes have been extensively used in modification of wool, due to their non-toxic and eco-friendly characteristics, as well as to reduce pollution in textile production. In the present work, chitosan was grafted onto wool fabrics using horseradish peroxidase (HRP) in order to endow wool with outstanding properties. The reaction mechanism, grafting percentage, and properties of chitosan-grafted pretreated wool fabric including wettability, dyeability, shrink resistance, and antibacterial activity were studied. P-hydroxyphenylacetamide (PHAD), as a model compound for tyrosine residues in wool,was used to study the mechanism of HRP-mediated grafting of chitosan onto wool. UV and FTIR analyses indicated that quinones, which are intermediate of HRP/H2O2-catalyzed PHAD, reacted with the amino groups of chitosan by Schiff base or Michael addition reactions. Scanning electron microscopy (SEM) showed that dichloroisocyanuric acid pretreatment had an etching effect and some substances were deposited onto the wool fiber. SEM and Fourier transform infrared (FTIR) spectroscopy further confirmed the covalent grafting of chitosan onto wool. Compared with chitosan-grafted unpretreatedwool, there was an obvious improvement in grafting efficiency of chitosan onto wool fabric, physical and mechanical properties after pretreatment and chitosan grafting on the wool. For chitosan-grafted pretreated wool fabrics, there was no observable change in the thermal behavior, while the hydrophilicity, dyeability, shrinkage resistance, and antibacterial activity were remarkably improved compared to that of untreated wool. The present work offers a new ecologically acceptable process of grafting chitosan on the wool.
Lingling ZHOU,Wenqi LI,Brian Sheng-Xian TEO,Siti Khalidah Md YUSOFF 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.1
Environmental protection has been infused into the development of numerous fields by the Chinese government. The government’s implementation of green development has also shifted its focus to green transformation and governance of highpolluting companies. In the context of green and sustainable development, this study employs DEA data envelopment analysis to compare the operating efficiency of listed firms that implemented Green Mergers and Acquisitions (M&A) in China in 2018. The conclusions of this study are as follows: First, China’s green M&A enterprises are unevenly dispersed among the country’s east, middle, and western regions. Second, compared to before the implementation of Green M&A, operational efficiency has improved in most industries. Third, the difference in Green M&A across industries is generally favorable, showing that most organizations have improved their operational performance as a result of Green M&A implementation. In 2018, however, the gap in operating efficiency is more negative. Fourth, whereas the eastern and western areas’ operational efficiency has improved as a result of Green M&A, the central region’s has not. Based on this conclusion, this study makes recommendations for China’s future sustainable development of heavily polluted firms.
Lingling Yan,Yiming Bai,Bo Yang,Nuofu Chen,Zhan'ao Tan,Tasawar Hayat,Ahmed Alsaedi 한국물리학회 2018 Current Applied Physics Vol.18 No.4
The efficient photon harvesting in near infrared wavelength range is still a challenging problem for high performance Cu(In1-x, Gax)Se2 (CIGS) solar cell. Herein, adjusting the energy band distribution of CIGS solar cell could provide significant academic guidance for devices with superior output electric power. To understand the role of each functional layer, the optimal 3000 nm CIGS absorber layer with 1.3 eV bandgap and 30 nm CdS buffer layer were firstly obtained via simulating the uniform band-gap structures. By introducing CIGS absorber layer with a double grading Ga/(GaþIn) profile, the power conversion efficiency of the double gradient band gap cell is superior to that of uniform band-gap cell through extending absorption of near-infrared wavelength range. Upon optimization, the best power conversion efficiency of CIGS with a double gradient band gap solar cell is improved significantly to 24.90%, among the best values reported in literatures, which is an 8.17% relative increase compared with that of the uniform band-gap cell. Our findings provide a theoretical guide toward the design of high performance solar cells and enrich the understandings of the energy band engineering for developing of novel semiconductor devices.
Lingling Liu,Shixian Chen,Anchang Xu,Guangming Cai 한국섬유공학회 2020 Fibers and polymers Vol.21 No.2
Adding nano silver wires (AgNWs) onto electrospun polyurethane (PU) nanofiber mat provide a new idea for developing wearable smart textiles. The excellent stretchability of PU and the excellent electrical conductivity of AgNWsenable wearable smart textiles to monitor human physiological data. In this study, PU nanofiber mat was prepared by electrospinning and subsequently was dip into AgNWs dispersion for conductivity. The PU nanofiber mats adsorbed with AgNWs were with both good stretching and electrical conductivity. The surface morphology and surface elements were analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The mechanical properties and the variation of electrical conductivity under static and dynamic stretching cycles were studied. In addition, it is accurately monitoring variation in electrical conductivity during finger bending and wrist movement. The experimental results show that the PU mat treated by AgNWs has the potential to be used as a wearable strain sensor for real-time monitoring of human motion.
Lingling Deng,Erli Zhang,Chang Chen 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.5
Cisplatin is a platinum-based compound that islargely employed as an effective antitumor drug against awide spectrum of solid neoplasms for many years. Despiteof its initial therapeutic success, cisplatin often results inhigh incidence of chemoresistance and high-dose cytotoxicity. Consequently, considerable efforts in hopes ofreducing the dose-dependent side effects of cisplatin whileretaining, or even enhancing, its antitumor properties havebeen undertaken throughout the past three decades. Nitricoxide (NO) is a small lipophilic free radical gas possessingversatile biological functions, including antitumor activities. However, NO, of itself, is difficult to be used, becauseof its extreme instability and short half-life. Previously, wehave reported a stable NO donor, b-galactosyl-pyrrolidinyldiazeniumdiolate (b-Gal-NONOate), which exerts tumorkilling effects through site-specific intracellular release ofexogenous NO. In this study, we further investigated thecombined inhibitory effect of b-Gal-NONOate and cisplatinagainst C6/LacZ, 9L/LacZ, and HeLa/LacZ tumorcells. It was shown that, in combination with b-Gal-NONOate, the antitumor effects of cisplatin against thesecommon tumor cell lines were increased in a dose-dependentmanner. Furthermore, the combination of thesechemicals resulted in a synergistic suppression on tumorgrowth, which was achieved under a much lower cisplatindosage. Collectively, our findings indicate that b-Gal-NONOate can synergistically improve the antitumor effectof cisplatin, and may therefore reduce its side effectscaused by high dose cisplatin monochemotherapies. Accordingly, b-Gal-NONOate is an important therapeuticassistant reagent with great potential of clinical applicability,and thus worth of continuous research in the comingfuture.