Papers by Keyword: Morpholoy

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Authors: Wei Han, Yue Dan Wang, Yu Feng Zheng
Abstract: TiO2 nanomaterials with different dimensions(zero and one), sizes(20nm, 50nm and 100nm in diameter) and crystal structures(100% rutile, 100% anatase and combination of 20% rutile and 80% anatase) were confected to suspensions and ointment with varied concentrations and evaluated in animal model (Balb-c mouse). These mouse were divided into various groups randomly, with suspension intraperitoneally injected or ointment transdermally daubed. Heart, lung, liver and kidney were collected and prepared to HE sample after one week. Spectrophotometry was applied to study total antioxide capability and catalase activity of blood and tissues. It has been shown that all TiO2 nanomaterial groups had no effect on lives’ morphology and oxidative stress, with no obvious histopathological changes observed in heart, lung, liver and kidney, and these tissues presented no vacuolar degeneration, necrosis edema, engorgement and inflammation.
Authors: Kazutoshi Kojima, Hajime Okumura, Satoshi Kuroda, Kazuo Arai, Akihiko Ohi, Hiroyuki Akinaga
Abstract: Homoepitaxial growth was carried out on 4H-SiC on-axis substrate by horizontal hot wall chemical vapor deposition. By using carbon face substrate, specular surface morphology of a wide area of up to 80% of a 2-inch epitaxial wafer was obtained at a low C/Si ratio growth condition of 0.6. The Micropipe in on-axis substrate was indicated to be filled with spiral growth and to be dissociated into screw dislocations during epitaxial growth. It was found that the appearance of basal plane dislocations on the epitaxial layer surface can be prevented by using an on-axis substrate.
Authors: Kazutoshi Kojima, Tetsuo Takahashi, Yuuki Ishida, Satoshi Kuroda, Hajime Okumura, Kazuo Arai
Authors: Takashi Aigo, Wataru Ito, Hiroshi Tsuge, Hirokatsu Yashiro, Masakazu Katsuno, Tatsuo Fujimoto, Wataru Ohashi
Abstract: 4H-SiC epitaxial growth on 2˚ off-axis substrates using trichlorosilane (TCS) is presented. Good surface morphology was obtained for epilayers with C/Si ratios of 0.6 and 0.8 at a growth temperature of 1600°C. The triangle defect density was reduced to a level below 5 cm-2 at 1600°C and below 1 cm-2 at 1625°C for a C/Si ratio of 0.8. Photoluminescence (PL) measurements were carried out with band-pass filters of 420 nm, 460 nm, and 480 nm to detect stacking faults. A stacking fault density of below 5 cm-2 was achieved at 1600°C and 1625°C with a C/Si ratio of 0.8. The optimal conditions for TCS growth were a C/Si ratio of 0.8 and a growth temperature of 1600°C. The evaluation of stacking faults and etch pit density indicated that the use of 2˚ off-axis substrates and TCS is effective for reducing basal plane dislocations. Comparing these results to those using silane (SiH4) with HCl added, it was demonstrated that TCS is much more suitable for obtaining high-quality epilayers on 2º off-axis substrates.
Authors: Pieter Samyn, Alessandro Ledda, Jan Quintelier, Isabel Van Driessche, Gustaaf Schoukens, Patrick de Baets, Wim De Waele
Abstract: Polymer wear debris particles undergo a thermal and mechanical (shear) cycle since their generation and therefore contain information on the friction and wear processes, while it is often difficult to draw quantitative data from them relating to transitions in tribological behaviour. Results from thermal DTA/TGA analysis and morphological pattern spectra of debris are presented and related to a transition at 180°C sliding temperatures own to hydrolysis and imidisation.
Authors: Qing Ming Jia, Shao Yun Shan, Li Hong Jiang, Ya Ming Wang
Abstract: Polyaniline with different morphologies doped by nitric acid were prepared using rapid mixture method. Scanning electron microscopy analysis showed that morphologies of polyaniline can be changed from unequal particles to nanowires with increasing the molar ratio of aniline to ammonium peroxydisulfate. The adsorption of rhodamine B dye was carried out using the polyaniline with different morphologies, and the effect of morphologies was studied. The results proved that adsorption of rhodamine B from aqueous solutions using polyaniline is an effective and economical method, and morphologies of polyaniline obviously affect its adsorption performance. The polyaniline nanowires present the best adsorption performance for removal rhodamine B among polyaniline with the three kinds of morphologies.
Authors: Teng Fei Shen, Ying Juan Sun
Abstract: In this work, nanoAlumina particles (nanoAl2O3) have been synthesized via solid state reaction. Effect of quantity of surfactant on particle size has been investigated. nanoAl2O3 was modified using chloroform as solvent and fatty acid as modifier at room temperature. The advantage of this modification is that it can be proceed at room temperature and it can reduce energy consumption. The products were characterized by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
Authors: Yang Lei, Ying Zhang
Abstract: A vehicle plate location algorithm under complex scenes is presented that based on interest region extraction and morphology. First of all, extract the edge of the lane, obtain the driveway area from the edge of the road, confirm the region of interest with the experiences in the driveway area, it can reduce the scope for searching. Then preprocessing is used in the vehicle image, including gray, edge detection and binary transformation is used. Then a series of morphological operations are used to look for candidate regions that probably contain the characters in range of sizes. Finally, the vehicle license plate can be found according to the median filter.
Authors: Anna Zymla, Victor Zymla, Jean-Bernard Guillot
Authors: Hong Mei Wang, Lin Lu, Xiao Long Liu, Feng Gao
Abstract: Three kinds of lead-free soldering tin powder particles produced by means of ultrasonic vibration atomization were studied in this paper. For tin powder particles had higher edge angle and more irregular shape which were the two most key elements that may influence the quality of soldering paste, aspect ratio and fractal dimension of those particles were treated as the facts that could reflect the morphology of soldering tin powder particles. Geometrical projected images of those particles were acquired by optical microscope and image computing were processed by morphologic method. Since particles adhesion phenomenon often occurred in actual image processing of soldering tin powder particles, Roberts operator was used for edge detection and in the meantime, Erosion method and Dilation method in morphological operation were applied to segment those adhesive particles. It was shown that the morphologic method proposed in this paper could be applied to segment those images of adhesive particles.
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