Papers by Keyword: Cr

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Authors: Hong Li Zhao, Jing Hui Fan, Shu Chang Fu, Xiao Fang Guo
Abstract: Interferometric baseline plays a very important role in InSAR data processing, and it will directly affect the accuracy of interferometric result. Shuping area is covered by all of vegetation, so the coherence is very low. In Shuping area, it is very difficulty to generate clearly residue stripe to use the FFT method and to find natural coherence pixels points as GCP to refine the baseline to meet the need of monitoring the deformation accurately. But through CR stability phase information can be got. So It is also highlights to the apply CR in this region to refine the baseline parameters. In this article, the baseline got from coarse orbit file is regarded as initial value, and that got from precise orbit file is regarded as True. By comparing and analyzing the parameters of refined baseline with that of the precise baseline, it can be concluded that the refined method based on CRs is correct and feasible.
Authors: Xin Gong Tang, Xing Bing Xie, Liang Jun Yan
Abstract: Complex resistivity (CR) is one of an electromagnetic method which plays an important role in the exploration of oil and gas, underground water as well as solid mineral resources in recent years. Nowadays China is under fast developing and there is still a big gap between the supply and demand of mineral resources. As an effective controlled source electromagnetic method, CR method can be easily used to judge the content of resources, determine the target reservoir and select a favorable drilling area. In this paper, an introduction to CR method and its application in copper mine exploration in west China is present. The result shows that CR is an effective electromagnetic method in the exploration of deep mineral resources.
Authors: B. Perumal, M. Pallikonda Rajasekaran
Abstract: Medical imaging is important in trendy medical aid that gives diagnostic info for clinical management of patients and designing of treatment. Every year, terabytes of medical image data’s square measure used through advanced imaging modalities like Positron Emission Tomography (PET) Magnetic Resonance Imaging (MRI), Computed Tomography (CT), and lots of additional new methodology of medical imaging. Advances in technology have created the chance for radiology systems to use complicated compression algorithms to scale back the file size of every image in an attempt to partly offset the rise in knowledge volume created by new or additional complicated modalities whereas protective the numerous diagnostic info. This paper outlines the various compression strategies like Discrete Cosine Transform (DCT), Fractal Compression and Set Partitioning In hierarchical Trees (SPIHT) applied to numerous medical pictures. Experimental results show that the projected SPIHT approach achieves the next Compression Ratio (CR), Bits Per Pixel (BPP) and Peak Signal to Noise Ratio (PSNR) with less Mean square Error (MSE) in comparison with DCT methodology.
Authors: Shamsuddin Saidatulakmar, Shamsul Baharin Jamaludin, Zuhailawati Hussain, Zainal Arifin Ahmad
Abstract: Fe-Cr matrix composite reinforced with alumina with mean powder sizes of 13, 23, 24 and 64 μm was successfully obtained through powder metallurgy method. The powder mixture were blended at a rotating speed of 250 rpm for thirty minutes and uni-axially pressed at a pressure of 750 MPa. Samples identified as J13, J23, J24 and J64 according to alumina particles size were sintered in a vacuum furnace under 10-2 Torr at a temperature of 1100°C for two hours with 10°C/minutes heating rate. The peaks of XRD patterns have been identified as belonging to the phases of Fe, Cr and alumina. The EDX analysis confirms the existence of Fe, Cr, Al and O. Reinforcing the Fe-Cr matrix with alumina particles bigger than 13 µm deteriorated the microstructure and mechanical properties of the composites. The wear coefficient for sample reinforced with 13 µm alumina particles is 2.46 × 10-11 with compressive strength of 278 MPa. Meanwhile for sample reinforced with 64 µm alumina particles its wear coefficient is 5.09 × 10-11 and compressive strength is 81 MPa. It is found that reinforcing smaller alumina particles sizes to Fe-Cr matrix resulted in better wear and strength properties of the composites.
Authors: Hua Wang, Mei Li Du, Guo Tao Zhang
Abstract: The concentration and distribution of Cr, Pb and Zn in 22 Jurassic coals from northern Shaanxi,and Ningxi, China were studied. The samples were collected from eight coal mines of five different region, including Yuyang Region, Hengshan, Shenmu, Huangling and Lingwu. Comparing with Chinese coals, American coals and coal Clarke value: Pb showed different degree enrichment in the study region except Ningxia ; Cr was enriched in Shenmu coals, Huangling coals and Hengshan coals; whereas the content of Zn in the study region coals was lower than in American coals. Horizontal variation of the three elements in the study region indicated that different elements showed different variation trend. Based on statistical analyses, Pb showed a moderate relationship with ash yield, whereas Cr had a high correlation coefficients with total sulfur.
Authors: Jin Ming Liang, Di Tang, Peng Cheng Zhang, Hui Bin Wu, Hong Yan Mao, Xiao Tong Liu
Abstract: This paper focus on the development of low-alloy anti-corrosion steel for the upper deck of COT(cargo oil tank), and the corrosion behavior of Cr-containing low-alloy steels in O2-CO2-SO2-H2S moisture were studied using homemade COT corrosion simulation device. After the corrosion experiment, related corrosion data was measured, and macro morphology and structure of corrosion scale were observed by SEM(Scanning Electron Microscope). The phase and chemical composition of corrosion product film were analyzed by XRD(X-ray diffraction) and EDS(energy dispersive spectroscopy). The effect of misorientation distribution on anti-corrosion property of steel was investigated by EBSD(electron backscattered diffraction). Based on the results, corrosion scale of COT on the upper deck consist of α-FeOOH, γ-FeOOH, FeS2, S and Fe1-xS, and the type of corrosion is mainly general corrosion. Cr enrichment was found on the inner corrosion product film, the addition of Cr leads to the increasing of low-angle grain boundaries and sub-grain structure which is conducive to the improvement of corrosion resistance.
Authors: Marek Betiuk
Abstract: The formation of anti-wear coatings on the inner surface of steel cylinders and pipes presents a difficult process-related problem for PA PVD methods. This problem is associated with a strictly limited geometry of the reaction space and dimensions of plasma sputtering-sources. Among the main factors behind physical and chemical phenomena occurring the reaction space, formed within a low-temperature plasma and at its boundaries with a solid object, there are type, concentration, unobstructed path for reacting substances, as well as values and geometry of electrical/magnetic/thermal fields [1-5]. In the research on the plasma-based technology in confined space, the lowest possible distance between the surface being modified and the source of ions of metallic and gaseous elements is taken into account.
Authors: Lan Wu
Abstract: A Multi-quantum-well (MQW) spatial light modulator (SLM) was developed and tested. The test results shows that CR could reach 1.7,the swing of driving voltage is 1.5 under the conditions of room temperature while the wavelength is 847.6nm,and the CR could reach 5.1,the swing of driving voltage is 3.2 under the conditions of the temperature of -15.4oC while the wavelength is 846nm. A programmable driving circuit is also developed to aim at this SLM. The chip of this driving circuit, with 64×64 array, adopted the 0.35µm CMOS technique. The test results show that, the resolution of driving voltage is alterable and could up to 256-level with only 65*65µm2 pixel estate. The driving voltage swing is from 0 to VDD. It could be flip-chip bounded with Multi-quantum-well (MQW) spatial light modulator (SLM). The driving circuit meets all the requirements of the Multi-quantum-well (MQW) spatial light modulator (SLM).
Authors: Hee Joon Sung, Yeon Baeg Goo, Kyeong Ju Kim, Kee Young Choi
Abstract: Chemical composition effect on the weld properties for low temperature steel was evaluated. The alloy elements of interest at the weld metal were Cr and Mo, which come from the steel plate and welding wire, respectively. Both side one run SAW process was carried out in a Ygroove butt joint. Microstructure of the weld metal is strongly dependent on the chemical composition of the steel plate and the welding wire, due to high dilution. The microstructure of the weld metal became fine acicular ferrite by increasing Cr and Mo content because of high hardenability effect. The weld metal having Cr and Mo possessed the highest impact toughness at low temperatures among the weld metals studied. Cr seems to have more effect than Mo on the toughness of the weld metal.
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