Papers by Keyword: Impurity

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Authors: Jing Shu Yuan, Guang Sheng Cao, Ping Chen, Yang Gao
Abstract: Aiming at plugging removal issues of polymer flooding well, first of all, the mechanism of formation plugging is analyzed, and then, we discuss the reasons of bottom borehole block in polymer water flooding well and block laws. Finally, some typical indoor experiments are designed, during testing; some chemicals are tested, such as CJN-x, sodium nitrite, sodium sulfite etc. are tested. Through these experiments, these different effect of materials reducing viscosity is compared, among them, the CJN-1x and hydrogen peroxide possess better effect of plugging removal for polymer flooding wells.
Authors: Xiao Bo Wang, Chuan Sheng Wang
Abstract: Distinguishing carton black and impurity is important for evaluating carton black’s dispersion in rubber. There are two types of impurities, filamentous impurity and scratch. According to the characteristics of filamentous impurity, the ratio of perimeter to solidity of region and hole’s area were calculated to distinguish this type of impurity. If hole’s area was larger than 3 or the value of the ratio larger than 160, the region was regarded as filamentous impurity. Scratch was very like line, which could be identified by the way of hough translation. The treatment of impurities based on morphology is helpful for improving the accuracy of detecting carton black and calculating carton black’s dispersion.
Authors: Ping Yu Tsia, Huang Liang Li, Jen Chi Fu, Kuo Ching Chiou, Yung Tang Shen, Cheng Chih Liu, Ching I Wu, Cheng Kai Weng
Abstract: The purpose of the study was to explore if there was a significant effect on debasing impurity, current and pH value by four common aquatic plants: Taros, Water Hyacinth, Water Spinach, and Water Cabbage. The duration of the experiment was 31 days. The researchers observed and recorded the change of impurity, current and pH value. Furthermore, the researchers utilized MANOVA to analyze the data collected and to explore if there was a significant effect on purifying polluted water by four aquatic plants. According to the results, there was a significant difference on debasing impurity and pH value among the four aquatic plants. These four aquatic plants were able to debase impurity in order as Water Cabbage, Water Hyacinth, Water Spinach and Taros. The effects of debasing impurity were in order as Water Hyacinth, Water Cabbage, Taros, and Water Spinach.
Authors: Aukkaravittayapun Suparerk, Je Sik Shin, G.H. Lee, Zin Hyoung Lee, K.I. Bang, K.S. Lim
Authors: Duc Nguyen-Manh
Abstract: Ab-initio calculations have been performed to investigate systematically defect-impurity interaction in Tungsten and other bcc transition metals. It is found that the most stable configuration of C and N atoms is the octahedral interstitial site whereas O and H atoms are located in the tetrahedral configuration. For the particular case of bcc-W, the binding energies formed by the carbon and nitrogen atoms located at octahedral sites, and mono-vacancy on a nearest neighbor site are very large, 1.39 eV and 1.91 eV, respectively. Implication of these results of diffusion of point defects in tungsten is discussed and compared with the case of bcc-Fe.
Authors: I.J. Bae, S. Baik
Authors: Hee Gon Bang, Jun Ho Song, Sang Yeup Park
Abstract: During the sintering process, the onset of abnormal grain growth is depend on various factors. The abnormal grain growth behavior, however, was focused only the growth stage compared to nucleation stage. Because most of abnormal grain growth occurred to a rapid mode, the observation of abnormal grain growth was impossible. In this study, we intend to in-situ observe the nucleation stage of abnormal grain using porous alumina. As a result, the liquid phase due to unintended impurities plays a main role for the formation of abnormal nuclei by the rearrangement of small grains due to the capillary force.
Authors: Dmitri A. Molodov, U. Czubayko, Günter Gottstein, Lasar S. Shvindlerman
Authors: Musbah Mahfoud, Daryoush Emadi
Abstract: Aluminum has experienced significant growth in several sectors over the last decade as a result of its properties and performance attributes. Aluminum is being recognized by different sectors such as automotive, construction, aerospace, etc. as a one of the best candidate material for various applications. Increasing demand for aluminum-based products and further globalization of the aluminum industry have contributed significantly to the higher consumption of aluminum scrap for re-production of aluminum alloys. In automotive applications, for example, the opportunities for continued growth in powertrain and suspension applications plus lightweighting of body structures offer the potential for considerable further growth. Today, a large amount of the aluminum going into new products is coming from recycled products. This represents a growing "energy bank" of aluminum that will become available for recycling at the end of vehicles' lives, and thus recycling is becoming a major issue, and it is essential to tackle this problem before it is too late. The future growth offers opportunity for new recycling technologies and practices to maximize scrap quality, improve efficiency and reduce cost. The present paper highlights some of the current development work in recycling, the challenges facing the implementation of recycling technologies and the future prospective of the idea.
Authors: Zheng Bin Xu, Yong Zhi Zou, Wen Chao Wang, Xing Zhi Pang, Jian Min Zeng
Abstract: The scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to characterize samples prepared from the surface scum of melt, the middle flake residues on the furnace wall and the “bottom bulk” after the A357 alloy pouring. The morphology and impurities composition of these features were investigated. Some of particles and regions in samples during the analyses were also studied in detail. The results of analyses show that the surface scum of melt include Al2O3, MgO or MgAl2O4; the impurities of the middle flake residues is comprised of Al2O3, MgO or MgAl2O4, as well as SiO2 particle, Al9Fe2Si2 compound and dimple like C-rich areas; the bottom bulk contains C-rich impurities such as Al4C3 or some of unknown phase or elemental carbon.
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