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Microwave-assisted functionalization of polyurethane surface for improving blood compatibility
Deqiang You,Mei Tu,Rong Zeng,Hao Liang,Weizhong Mai,Jianhao Zhao,Zhengang Zha 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
In order to improve the hemocompatibility of polyurethane (PU), we report a rapid and efficient two-step approach to graft poly(ethylene glycol) (PEG) onto PU surface by a microwave-assisted method,involving diphenylmethane diisocyanate (MDI) – functionalization and subsequent PEG coupling. Compared with conventional heating, the effects of solvent, time and MDI concentrations on the microwave-assisted MDI-functionalization, and the effect of time on the microwave-assisted PEG coupling were studied. PEGs with different molecular weights were successfully grafted onto PU surface under the optimum microwave-assisted conditions within only 20 min, and characterized by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and chemical titration. The hydrophilicity and in vitro blood compatibility of the surfaces were evaluated by water contact angle measurements, blood coagulation time (whole blood clotting time and prothrombin time) and platelet adhesion tests, respectively. All the PU-PEG surfaces had improved surface wettability and hemocompatibility. The results suggested that microwave-assisted functionalization may be a promising method for rapidly and effectively decorating polyurethane surfaces.
Wenqiang Sun,Deqiang Zhang,Xiang Chen,Keyan Wang,Jiqing Zhang,Yunjie Jia 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2
Cold work dies (of Cr12MoV) surface of the WC/Ni composite coating prepared by laser cladding can be used to quickly repair worn areas of dies. The composition, hardness, fracture morphology, microstructure, and shear strength of the coating were characterized by microhardness tester, universal tensile testing machine, XRD, EDS, and SEM. The results show that the main phase of the coating is composed are M 23 C 6 , FeNi 3 , Cr 7 C 3 , WC, W 2 C, Cr 2 B, Fe 2 B, and W 2 B. The change of scanning speed only changes the diffraction peak, but has little effect on the internal structure and strengthening mechanism of the coating. With the decrease of scanning speed, the powder deposition density per unit time increases, and a large number of pores and unmelted particles are mixed in the coating, which weakens the bonding strength between the coating and the substrate, and the fracture mechanism of the coating changes from quasi-cleavage fracture to brittle fracture.
Low-Rank Representation-Based Image Super-Resolution Reconstruction with Edge-Preserving
( Rui Gao ),( Deqiang Cheng ),( Jie Yao ),( Liangliang Chen ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.9
Low-rank representation methods already achieve many applications in the image reconstruction. However, for high-gradient image patches with rich texture details and strong edge information, it is difficult to find sufficient similar patches. Existing low-rank representation methods usually destroy image critical details and fail to preserve edge structure. In order to promote the performance, a new representation-based image super-resolution reconstruction method is proposed, which combines gradient domain guided image filter with the structure-constrained low-rank representation so as to enhance image details as well as reveal the intrinsic structure of an input image. Firstly, we extract the gradient domain guided filter of each atom in high resolution dictionary in order to acquire high-frequency prior information. Secondly, this prior information is taken as a structure constraint and introduced into the low-rank representation framework to develop a new model so as to maintain the edges of reconstructed image. Thirdly, the approximate optimal solution of the model is solved through alternating direction method of multipliers. After that, experiments are performed and results show that the proposed algorithm has higher performances than conventional state-of-the-art algorithms in both quantitative and qualitative aspects.
The Waves of Social Justice and Peace in American Adult Education
Fujuan Tan,DeQiang Zhang 사단법인 한국평화연구학회 2010 평화학연구 Vol.10 No.3
Political and socio-economic factors have evoked continuous debates and concerns about justice and peace in American adult education since early 20thcentury.Challengestowardstheissuesofrace,class,gender,amongothers,havebecomebothsubjectsandthemesofmanyadulteducatorsandtheorists’pursuits.Eliminationofinequalitycausedbyrace,class,andgenderdiscriminationsthrougheducationhasalwaysbeenoneofthemajorgoalsofadulteducation.Thishasbeenhelpingpeoplemarginalizedinvariousrespectsfindhopeandfaith,andcontributingtomaintainapeacefulsocietyandworld.ThispaperfocusesonintroducingthewavesonbehalfofsocialjusticeandpeaceinAmericanadulteducationrepresentedbytheinfluentialfigures,aswellastheprofoundinfluenceofrace,class,andgenderissuesinmodernAmericanadulteducation
Filtration and regeneration behavior of polytetrafluoroethylene membrane for dusty gas treatment
Weidong Zhang,Deqiang Jiang,Junteng Liu,Zhongqi Ren,Wang Geng 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4
With micron talcum particles and nano-CaCO3 powder as test dust, a series of experiments have been carried out to systematically study the gas filtration and regeneration behavior of polytetrafluoroethylene membrane, and some comparisons were made with common filter media. The experimental results showed that the PTFE membrane had a filtration efficiency of above 99.99% for micron particles, and excellent regeneration behavior was obtained, though a much higher initial pressure drop existed. Based on the results, it was concluded that the PTFE membrane is an excellent surface-filtration media for micron particles. Effects of operation parameters, including airflow velocity, particle concentration and particle characteristics were also investigated. To better understand the evolution of pressure drop during the filtration process, a mathematical model with operation parameters and characteristics of particles was derived from the gas-solid two-phase flow theories. A novel method on the determination of regeneration period of the filter media was put forward based on the analysis of the pressure drop according to this model
Collaborative Sub-channel Allocation with Power Control in Small Cell Networks
( Guang Yang ),( Yewen Cao ),( Deqiang Wang ),( Jian Xu ),( Changlei Wu ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.2
For enhancing the coverage of wireless networks and increasing the spectrum efficiency, small cell networks (SCNs) are considered to be one of the most prospective schemes. Most of the existing literature on resource allocation among non-cooperative small cell base stations (SBSs) has widely drawn close attention and there are only a small number of the cooperative ideas in SCNs. Based on the motivation, we further investigate the cooperative approach, which is formulated as a coalition formation game with power control algorithm (CFG-PC). First, we formulate the downlink sub-channel resource allocation problem in an SCN as a coalition formation game. Pareto order and utilitarian order are applied to form coalitions respectively. Second, to achieve more availability and efficiency power assignment, we expand and solve the power control using particle swarm optimization (PSO). Finally, with our proposed algorithm, each SBS can cooperatively work and eventually converge to a stable SBS partition. As far as the transmit rate of per SBS and the system rate are concerned respectively, simulation results indicate that our proposed CFG-PC has a significant advantage, relative to a classical coalition formation algorithm and the non-cooperative case.
Yizao Wan,Zhonghong Lin,Deqiang Gan,Teng Cui,Meirong Wan,Fanglian Yao,Quanchao Zhang,Honglin Luo 한국섬유공학회 2019 Fibers and polymers Vol.20 No.8
Graphene-based nanomaterials have been used as biomaterials to enhance cell adhesion, growth, anddifferentiation. However, the effect of graphene materials on cancer cell behavior has not been thoroughly investigated. Herein, we have incorporated graphene oxide (GO) into cellulose acetate (CA) to develop nanofibrous scaffolds for in vitrocancer cell culture, which is a crucial step for drug screening and cancer research. The GO/CA scaffolds were seeded withbreast cancer cells and cell viability, proliferation, adhesion, infiltration, and morphology were assessed. Mechanicalcharacterization demonstrated that the mechanical properties of GO/CA scaffolds were significantly better than bare CAscaffold and improved with increasing GO content. More importantly, the in vitro cell studies showed that the cancer cells onGO/CA scaffolds had significantly higher viability and better cell adhesion and growth than bare CA. Our results confirm animportant role of GO in improving mechanical properties and cancer cell performance on GO/CA scaffolds. These resultssuggest the potential of the GO/CA scaffolds as a promising candidate for in vitro cancer models.