Silver/titanium dioxide composite nanoparticles imbedded in polyacrylonitrile (PAN) nanofibers and converted into carbon nanofibers by stabilization and calcination was obtained and tested for capacitive deionization ...Silver/titanium dioxide composite nanoparticles imbedded in polyacrylonitrile (PAN) nanofibers and converted into carbon nanofibers by stabilization and calcination was obtained and tested for capacitive deionization technology. First, the silver ions were converted to metallic silver nanoparticles, through reduction of silver nitrate with dilute solution of PAN. Second, the TiO2 precursor (Titanium Isopropoxide) was added to the solution to form Ag/TiO2 composites imbedded in the PAN polymer solution. Last step involves electrospinning of viscous PAN solution containing silver/TiO2 nanoparticles, thus obtaining PAN nanofibers containing silver/TiO2 nanoparticles. Scanning electron microscopy (SEM) revealed that the diameter of the nanofibers ranged between 50 and 300 nm. Transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) showed silver/TiO2 nanoparticles dispersed on the surface of the carbon nanofibers. The obtained fiber was fully characterized by measuring and comparing the FTIR spectra and thermogravimetric analysis (TGA) diagrams of PAN nanofiber with and without imbedded nanoparticles, in order to show the effect of silver/TiO2 nanoparticles on the electrospun fiber properties.展开更多
Fundus diagnosis is an important part of the whole body examination that may provide rich clinical information to doctors for diagnostic reference. Manual fundus vessel extraction is helpful to quantitative measuremen...Fundus diagnosis is an important part of the whole body examination that may provide rich clinical information to doctors for diagnostic reference. Manual fundus vessel extraction is helpful to quantitative measurement of diseases but obviously it is a tough work for physicians. This paper presents an automatic method by using Gabor filter bank to extract the artery and vein separately in the ocular fundus images. After preprocessing steps that include gray-scale transform, gray value inversion and contrast enhancement, the Gabor filter bank is applied to the extraction of the artery and vein in the ocular fundus images. Finally these two different width types of vessels are selected by post-processing methods such as labeling, corrosion, binarization, etc. Evaluation results show an accurate rate of 90% in vein and 82% in artery from 20 cases, that indicates the effectiveness of our proposed segmentation method.展开更多
A novel polyolefin called poly(styrene-block-isobutylene-block-styrene)(“SIBS”)originated from Joseph P.Kennedy’s laboratory at the University of Akron(Akron,Ohio,United States)and was developed as a biomaterial fo...A novel polyolefin called poly(styrene-block-isobutylene-block-styrene)(“SIBS”)originated from Joseph P.Kennedy’s laboratory at the University of Akron(Akron,Ohio,United States)and was developed as a biomaterial for long-term implant applications by the author.SIBS has no cleavable groups on its backbone or sidechains,is comprised predominantly of alternating secondary and quaternary carbons on its backbone,which prevents embrittlement and cracking under flexion,and undergoes multiple purification steps which renders it extremely biocompatible and well-suited for long-term applications in the eye.This article explores two ophthalmic devices;1)the PRESERFLO®MicroShunt(Santen Pharmaceutical Co.Ltd.,Osaka,Japan)made from SIBS that lowers intraocular pressure to thwart progression of vision loss from glaucoma,and 2)a novel intraocular lens(IOL)made from crosslinked polyisobutylene,which is under-development by Xi’an Eyedeal Medical Technology Co.,Ltd.(Xi’an,China)that does not glisten nor cloud over time,as do most conventional IOLs.展开更多
文摘Silver/titanium dioxide composite nanoparticles imbedded in polyacrylonitrile (PAN) nanofibers and converted into carbon nanofibers by stabilization and calcination was obtained and tested for capacitive deionization technology. First, the silver ions were converted to metallic silver nanoparticles, through reduction of silver nitrate with dilute solution of PAN. Second, the TiO2 precursor (Titanium Isopropoxide) was added to the solution to form Ag/TiO2 composites imbedded in the PAN polymer solution. Last step involves electrospinning of viscous PAN solution containing silver/TiO2 nanoparticles, thus obtaining PAN nanofibers containing silver/TiO2 nanoparticles. Scanning electron microscopy (SEM) revealed that the diameter of the nanofibers ranged between 50 and 300 nm. Transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) showed silver/TiO2 nanoparticles dispersed on the surface of the carbon nanofibers. The obtained fiber was fully characterized by measuring and comparing the FTIR spectra and thermogravimetric analysis (TGA) diagrams of PAN nanofiber with and without imbedded nanoparticles, in order to show the effect of silver/TiO2 nanoparticles on the electrospun fiber properties.
基金Supported by National Natural Science Foundation of China(Nos.61262027,45627390)Research Foundation Project of the Guangxi Ministry of Education(No.200810MS048)
文摘Fundus diagnosis is an important part of the whole body examination that may provide rich clinical information to doctors for diagnostic reference. Manual fundus vessel extraction is helpful to quantitative measurement of diseases but obviously it is a tough work for physicians. This paper presents an automatic method by using Gabor filter bank to extract the artery and vein separately in the ocular fundus images. After preprocessing steps that include gray-scale transform, gray value inversion and contrast enhancement, the Gabor filter bank is applied to the extraction of the artery and vein in the ocular fundus images. Finally these two different width types of vessels are selected by post-processing methods such as labeling, corrosion, binarization, etc. Evaluation results show an accurate rate of 90% in vein and 82% in artery from 20 cases, that indicates the effectiveness of our proposed segmentation method.
文摘A novel polyolefin called poly(styrene-block-isobutylene-block-styrene)(“SIBS”)originated from Joseph P.Kennedy’s laboratory at the University of Akron(Akron,Ohio,United States)and was developed as a biomaterial for long-term implant applications by the author.SIBS has no cleavable groups on its backbone or sidechains,is comprised predominantly of alternating secondary and quaternary carbons on its backbone,which prevents embrittlement and cracking under flexion,and undergoes multiple purification steps which renders it extremely biocompatible and well-suited for long-term applications in the eye.This article explores two ophthalmic devices;1)the PRESERFLO®MicroShunt(Santen Pharmaceutical Co.Ltd.,Osaka,Japan)made from SIBS that lowers intraocular pressure to thwart progression of vision loss from glaucoma,and 2)a novel intraocular lens(IOL)made from crosslinked polyisobutylene,which is under-development by Xi’an Eyedeal Medical Technology Co.,Ltd.(Xi’an,China)that does not glisten nor cloud over time,as do most conventional IOLs.
