Papers by Keyword: Micro-Morphology

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Authors: Qi Wang, Qian Wang, Xiao Lin Qiu, Tian Ma Wang
Abstract: Dot is the smallest structural unit of image printing. Micro-characteristic of each printing dot such as spreading area, dot shape and three-dimensional shape which are formed on the surface of substrates affect the image replication quality directly. It is significant to accurately extract and analyze dot microstructure in the process of image transfer for evaluating the quality of image replication .Different shapes of printing dots from the standard offset proof are extracted through microscopic test system. The optimal threshold segmentation algorithm was determined by experiment which gets accurate microscopic quantitative value of the dot, the obtained two-dimensional and three-dimensional shape of printing dot became the basis to evaluate the quality of image replication. The between-cluster variance method is used for dot image segmentation. The research was carried on to track image edge after image threshold and to extract the characteristic parameters to accurately characterize the two-dimensional shape, thus characterizing the image replication quality of dot plane form accordingly; on the basis of collected dot two-dimensional data, the experiment was conducted to combine with gray value differences of single dot caused from ink accumulation within its shape areas. Besides, dot density contour and three-dimensional data were quantized by programming in order to restore three-dimensional shape of printing dot on the surface of substrates quantitatively and intuitively. It shows that quality of dot micro-morphology is the fundamental guarantee of image replication quality. The changes of dot shape, area as well as three-dimensional shape in the process of image replication affect the printing quality. Extraction and analysis dot microstructure can detect dot replication quality intuitively which becomes new method to evaluate image replication quality.
Authors: Hua Rong Shen, Yang Jiang, Wei Zhong He
Abstract: List The active of MgO was produced from magnesite tailings under certain conditions. The effect of calcinations temperature on the crystal structure of MgO was analyzed by XRD and SEM. Crystal particle of MgO was calculated according to Scherrer formula. The microstructural differences between the MgO agglomerates were examined by SEM at different temperatures. The activity of MgO was evaluated though conductivity which was measured by the conductivity meter. The activity of MgO effected by calcinations temperature was studied. The result showed that magnesite tailings was fully decomposed when that was calcined for 60min with the calcinations temperature of 1050°C, and the activity of MgO was very high. Established a hydration and expansion model of MgO is proposed to explain the activity of MgO.
Authors: Fu Xing Wang, Guo Zhong Li, Juan Chen
Abstract: The effect of admixtures on the mechanical properties of recycled fine aggregate cement mortar was studied. The result indicated that compared with blank samples the 28d flexural strength, the compressive strength and osmotic pressure of cement mortar were increased by 15.6%, 35.5%, 41.1% respectively when adding silicone waterproofing agent 0.2wt%, naphdalin series water reducer 1.0wt%, polycarboxylate superplasticizer 0.8wt%. The micro-morphology and hydration products of mortar specimens was observed by SEM, XRD respectively.
Authors: Zhao Mei Xu, Jian Zhong Zhou, Yin Bo Zhu
Abstract: The theory of laser milling ceramics was analyzed. Experiments of laser milling were done on Al2O3 ceramics with Nd:YAG laser. The influence law on the amounts of laser milling and milling surface quality with different parameters were studied systematically and the micro-morphology of the milling surface was analyzed. The optimal parameters were obtained according to the experimental results.
Authors: W. Zhu, Jian Zhong Zhou, M Wang, Shu Huang, Deng Hui Wei, Yu Jie Fan
Abstract: Micro-scale laser shock peening (μLSP) is a flexible and precise process that can potentially be applied to metallic structures in micro devices to improve strength and reliability performance. In order to understand the mechanism of μLSP process, a typical experiment was carried out for copper foils specimen with various process parameters. Surface morphology, deformation and hardness of the specimens were observed and characterized by 3D microscope system and situ nano-mechanical test system respectively. It was found that overlapping rate of laser spot has a little effect on microscopic deformation depth which increases slowly with the increasing of laser energy, and micro-hardness of the laser treated specimens was improved significantly.
Authors: Fu Xing Wang, Guo Zhong Li, Juan Chen
Abstract: A modification of using fly ash grout of different levels was adapted to treat the surface of recycled fine aggregate (RFA).The physical properties of RFA before and after modification and the effect on the mechanical performance of cement mortar was studied.The result indicated that the modification of RFA could strengthen the enhancement effect on mechanical performance when modified by 15wt% fly ash grout. After modification, water absorption of RFA was 6.12% and decreased by 47.5%. The 28d flexural strength was increased by 17.4% and compressive strength was increased by 24.2% of RFA cement mortar compared with the reference samples. The superficial microstructure and sectional morphology of RFA was observed by scanning electron microscopy (SEM). The modification mechanism was carried out.
Authors: Jing Zhang, Jiang Long Yu, Huan Zhao, Jun Shuai Liu
Abstract: β-Sialonwhiskers which the molecular structuralformula of β-Sialonis Si3Al3O3N5(z = 3) were synthesized from fly ash and graphite under appropriate technological conditions by carbothermal reduction–nitridation process. The effects of carbon content, reaction temperature and reaction time on synthesis ofβ-Sialonwere analysed by XRD, SEM techniques. The results proved that, the condition of the carbon content over 80% is the best parameter to promote theβ-Sialon powder production. Compared to other kinds of temperature, 1430 °C is the optimal temperature to promoteβ-Sialon powder generation. Compared to 3h, holding time of 6h is promoting theβ-Sialon powder generation.The main morphology of β-Sialon was rod-like whisker.
Authors: Ning Dong, You Qiang Wang, Qian Liu, Xing Bao Huang
Abstract: The elastohydrodynamic lubrication numerical analysis of water-lubricated tenmat bearing with single sine-type peak, single V-type valley and single rectangular-type valley was carried out by using the Reynolds equation. The results show that, for the bearing with single peak, the partial pressure peak appears and the corresponding film thickness increases rapidly and then decreases; With the increase of the amplitude of the sine function, the partial pressure of the lubricating film is also increased, the partial film thickness is decreased, as the wavelength increases, the pressure and the film thickness of the convex portion widened, the peak remains substantially unchanged. For the bearing with single V-type valley and single rectangular-type valley, the partial pressure are decreased, the partial film thickness are increased; with the amplitude of the roughness function increases, the partial pressure are decreased, on the contrary ,the partial film thickness are increased; with the wavelength increases, the pressure and the film thickness of the convex portion widened.
Authors: Wei Fu, Xiao Rong Huang, Hong Yi Chen, Hu Jie Niu, Meng Li Yang
Abstract: To understand the nickel supergene enrichment mechanism in the lateritic process, we have conducted a preliminary analysis of the micro-morphology and micro-area chemical characteristics of the nickel-carrying minerals of garnierite, sampled from the Kolonodale area of Sulawesi Island in Indonesia. The SEM + EDS analysis shows that, the main nickel-carrying minerals in garnierite are serpentine and talc. The micro-morphology of the talc is fragmented and in piling structure. The micro-morphology of serpentine manifested tubular, fibrous, plate-like and other morphologies, showing the staggered and twisted, mesh-cross and sheet-interwoven structures, etc. The EPMA line scan analysis shows that the mineral types of garnierite samples are mainly of serpentine, talc, olivine and pyroxene debris, containing small amount of quartz, chrome spinel, etc. The Ni content varies a lot in the different minerals, and the nickel-carrying level sorting from high to low is: talc> secondary serpentine> iddingsite > residual serpentine> residual spinel> secondary quartz.
Authors: Qiang Hua Zhang, Ying Ying Shi, Qin Zhong
Abstract: The goal of this paper was to study the micro-morphology and mineral composition of PM10 in Nan jing typical areas were studied using scanning electronic microscopy and energy dispersive spectrometer (SEM/EDS). Samples were collected as PM10 for 24 h using high-volume air sampler from Dachang and Shanxilu area. The SEM/EDS analysis showed that mineral particles with regular shapes were popular in PM10 in Dachang District, and mineral particles with irregular shapes were popular in PM10 in Shanxilu area respectively. The composition of mineral particles with regular shapes were mainly carbon ates, sulphates, and aluminosilicates, while mineral particles with irregular shapes were mainly soot aggregates, biomass and primitive minerals.
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