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RISS 인기검색어
- 검색키워드
- 저자 : Guiping Ma (검색결과 5 건)
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Effect of Light Intensity on Close-Range Photographic Imaging Quality and Measurement Precision
Kaifeng Ma,Ximin Cui,Guiping Huang,Debao Yuan 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.2
To test the effectiveness of flash intensity in digital close-range photogrammetry, test methods for the light intensity adjustment of a ring-flash on close-range photographic imaging quality and measuring precision were researched respectively. First, according to the efficiency of the flash, the imaging characteristics, and the gray distribution of the mark points of the image, the identified method of the image gray value for subjective visual analysis was presented, and a quality standard for the close-range photographic image was provided. Then, as a precondition to obtaining the best image quality, based on the estimation theory governing measurement adjustment precision, the changes in measuring precision under conditions of different light intensity and different photographic distances were analysed, and the relationships between measurement precision and light intensity, or photographic distance, were obtained. Finally, the globally optimal imaging quality and measurement precision for any given light intensity were quantified. Experimental results indicated that the root mean square (RMS) errors of the measurement adjustment precision were 0.028 mm, 0.039 mm, and 0.085 mm: the RMS errors in the measuring precision and the corresponding coordinate repeatability were 0.038 mm, 0.053 mm, and 0.118 mm. The best imaging quality was achieved at photographic distances of 3 m, 5 m, and 7 m, with corresponding output light intensities of 1/64, 1/32, and 1/16 under certain conditions, respectively. This can satisfy the precision requirements for large-scale coordinate measurement, and provides a basis for formulating a reasonable light intensity output from a ring-flash in the digital close-range photogrammetry.
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Xiao-lei Zhu,Hongwei Zhang,Jun Nie,Guiping Ma 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
pH-sensitive drug loaded core shellfibers were fabricated by a combination of electrospinning and UVphoto-polymerization. Combretastatin A4 (CA4) was selected as the model drug loaded in PLA to test thepH-sensitivity property of the core shellfibers. The morphology of thefibers was studied by scanningelectron microscopy (SEM), and the core shell structure of thefibers was confirmed by transmissionelectron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The drug release assay wastested via the UV–vis spectrophotometer, and the pH-sensitivity of core shellfibers was tested by drugrelease assay under pH 5.0 and 7.4.
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Qijian Niu,Xueyan Mu,Jun Nie,Guiping Ma 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.38 No.-
Fluoride compounds could migrate to the surface in a blending solution because of their low surfaceenergy. In order to prepare a photo-sensitive nanofiber, a diphenyl-ketone photoinitiator with afluorinated aliphatic chain was synthesized, and its structure was characterized using 1H NMR and 19FNMR, UV–vis absorbance spectroscopy, and fourier transform infrared (FT-IR). A blending solution ofpolyacrylonitrile (PAN) and photoinitiator containing fluorine with dimethylformamide (DMF) as thesolvent was electrospun to prepare a photo-sensitive nanofiber. The photo-sensitive nanofiber was usedto fabricate a polymer brush grafted on the nanofiber by initiating the polymerization of tripropyleneglycol diacrylate (TPGDA) and hydroxyethyl acrylate (HEA) monomers via UV irradiation. Thedistribution of the photoinitiator on the surface of the nanofibers before and after photopolymerizationwas measured using UV–vis absorbance spectroscopy. The kinetics of the photopolymerization of TPGDAand HEA monomers on the surface of the nanofibers was studied using real-time infrared spectroscopy(RT-IR). The size and morphology of the nanofibers were investigated using scanning electronmicroscopy (SEM). The internal core–shell structure and the surface composition of nanofibers werefurther studied using transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS),and attenuated total reflectance-infrared spectroscopy (ATR-IR). It was suggested that the photoinitiatoron the nanofiber surface could cause the polymerization of the TPGDA and HEA monomers under UVirradiation. The solubility of the nanofibers polymerized with TPGDA on the surface was alsoinvestigated in water, DMF and acetone. The experimental results indicated that the nanofiber wasenriched with the photoinitiator on its surface and that the nanofiber had potential for application in thepreparation of functional core–shell nanofibers.
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Xinwen Gong,Dongxue Yang,Nannan Wang,Shian Sun,Jun Nie,Guiping Ma 한국섬유공학회 2020 Fibers and polymers Vol.21 No.10
In order to improve the adsorption capacity of chitosan to organic dyes, the amino rich functionalized chitosanelectrospun nanofibers membrane was prepared. In the process of high efficiency synthesis, PGMA and PEI were grafted onthe surface of CS NFMs in turn. By means of XRD, ATR-FTIR and XPS, the successful introduction of amino group into CSwas confirmed. The selective adsorption capacity of CS-PGMA-PEI NFMs for anionic dyes was studied. The adsorptionkinetics analysis shows that the adsorption process of CS-PGMA-PEI NFMs is mainly pseudo second-order model. Itsadsorption isotherms can be described by the Langmuir model and it conforms to monolayer adsorption. The maximumadsorption capacity of Congo red calculated by Langmuir model is 657.47 mg/g. CS-PGMA-PEI NFMs has selectiveadsorption capacity for Congo red/methylene blue mixture. CS-PGMA-PEI NFMs also showed good circulation stability. This study provides a method for the synthesis of water purification membrane.
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Qijian Niu,Lingwang Zeng,Xueyan Mu,Jun Nie,Guiping Ma 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
The objective of this work is to demonstrate the feasibility of preparation of core-shell nanofibers byelectrospinning combined with in situ UV photopolymerization. The thiol-ene monomer with Si atomand the initiator can migrate to the surface with the evaporation of the solvent during the process ofelectrospinning, which caused phase separation due to the great migration ability of small molecule andlow surface energy. Then photo induced polymerization and cross-linking reaction took placesimultaneously during the electrospinning process, which formed shell of the nanofibers. Themorphology and structure of electrospun nanofibers were investigated by SEM and TEM. Thecomposition of the shell layer was determined by ATR-IR and XPS. Moreover, the nanofiber mats weretested by WCA test, and the hydrophobic ability of PVP nanofibers was improved because of theprotection of the shell layer with Si atom. The most important thing is that the technology whichcombined electrospinning with in situ photopolymerization provides a simple method for preparation ofcore-shell nanofibers.
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