The Experts below are selected from a list of 6651 Experts worldwide ranked by ideXlab platform
Soo-jin Park - One of the best experts on this subject based on the ideXlab platform.
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Formation and properties of polyester/copolyester conjugate fibers prepared by ultra-high-speed melt Spinning Technique
Polymer Engineering and Science, 2011Co-Authors: Yo-seung Ho, Soo-jin ParkAbstract:In this study, three types of conjugate fibers, sea-islands type, orange split type, and side by side type, were prepared by using an on-line steaming process through a high-speed Spinning Technique in order to improve the processibility, efficiency, and properties of the fibers. It was found that the weight reduction ratios of orange split and sea-island polyester/copolyester fibers were higher than that of polyester fibers. The SEM results indicate that the split time was shortened by using the ultra-high-speed melt Spinning process. The nozzle-draft increased and elongation decreased for side by side conjugate fibers after the spin speed was increased. The elasticity and crimp ratio of side by side conjugate fibers were significantly affected by the drawing temperature. POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers
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Effects of Spinning Conditions on Properties of Polyester Yarn Prepared using an Ultra-high-speed Melt Spinning Technique Equipped with a Steam Chamber
Bulletin of The Korean Chemical Society, 2010Co-Authors: Yo-seung Ho, Soo-jin ParkAbstract:‡In this study, the effects of the various parameters of Spinning and drawing processes on the properties of polyester full drawn yarn (FDY) prepared by steam processing during high-speed Spinning were investigated using several Techniques. The wet shrinkage ratio of the FDY was able to be manipulated by controlling the temperature and draw ratio. The FDY made using the steam high speed Spinning Technique exhibited identical properties (such as tenacity, elongation, and wet shrinkage ratio) to that of regular FDY, made using the spin-draw process. FDY prepared using the steam process during high-speed Spinning showed excellent dyeability. The dye pick-up of the polyester yarn spun at high-speed Spinning was found to be improved when dyed under an atmospheric pressure of 100 o C. This result was the same as regular FDY dyed under a high pressure of 130 o C.
Q A Zhang - One of the best experts on this subject based on the ideXlab platform.
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hydrogen storage properties of the supersaturated mg12yni solid solution
Journal of Alloys and Compounds, 2010Co-Authors: T Z Si, Y F Liu, Q A ZhangAbstract:Abstract A supersaturated Mg 12 YNi solid solution was successfully prepared by melt-Spinning Technique and its hydrogenation behavior and hydrogen absorption/desorption properties were investigated in detail. It was found that the hydrides of Mg 2 Ni and Y are formed accompanying the formation of MgH 2 during the hydrogenation process at 473–573 K. The hydrides of Mg 2 Ni and Y have a catalytic effect on the subsequent hydrogen absorption/desorption. Thus, the supersaturated Mg 12 YNi solid solution has a good activation property and an improved kinetics of hydrogen absorption/desorption.
Gang Xiao - One of the best experts on this subject based on the ideXlab platform.
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martensitic transformation and shape memory effect in ferromagnetic heusler alloy ni2fega
Applied Physics Letters, 2003Co-Authors: Zhuhong Liu, Yanxiang Cui, Yongli Zhou, Xixiang Zhang, M.-h. Zhang, Wanyan Wang, G H Wu, Gang XiaoAbstract:We have synthesized ferromagnetic Heusler alloy Ni2FeGa using the melt-Spinning Technique. The Ni2FeGa ribbon, having a high chemical ordering L21 structure, exhibits a thermoelastic martensitic transformation from cubic to orthorhombic structure at 142 K and a premartensitic transformation. The alloy has a relatively high Curie temperature of 430 K, a magnetization of 73 Am2/kg, and a low saturated field of 0.6 T. The textured samples with preferentially oriented grains show a completely recoverable two-way shape memory effect with a strain of 0.3% upon the thermoelastic martensitic transformation.
Qingjie Zhang - One of the best experts on this subject based on the ideXlab platform.
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Unique nanostructures and enhanced thermoelectric performance of melt-spun BiSbTe alloys
Applied Physics Letters, 2009Co-Authors: Wenjie Xie, Yonggao Yan, Xinfeng Tang, Qingjie Zhang, Terry M. TrittAbstract:We report a melt Spinning Technique followed by a quick spark plasma sintering procedure to fabricate high-performance p -type Bi 0.52 Sb 1.48 Te 3 bulk material with unique microstructures. The microstructures consist of nanocrystalline domains embedded in amorphous matrix and 5–15 nm nanocrystals with coherent grain boundary. The significantly reduced thermal conductivity leads to a state-of-the-art dimensionless figure of merit Z T ∼ 1.56 at 300 K, more than 50% improvement of that of the commercial Bi 2 Te 3 ingot materials.
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Nanostructure and thermoelectric properties of p-type Bi 0.5 Sb 1.5 Te 3 compound prepared by melt Spinning Technique
2007 26th International Conference on Thermoelectrics, 2007Co-Authors: Xinfeng Tang, G. Chen, Qingjie ZhangAbstract:P-type Bi0.5Sb1.5Te3 bulk material with fine nanostructure has been prepared by combining melt Spinning Technique with spark plasma sintering (SPS), and the effects of microstructure on the thermoelectric transport properties are investigated. Bi0.5Sb1.5Te3 ribbons with fine nanostructure are obtained during the melt Spinning process and the grain sizes of Bi0.5Sb1.5Te3 are about 5-15 nm observed by High-resolution transmission electron microscopy. Such structure has great influence on thermoelectric transport properties of Bi0.5Sb1.5Te3 compound. Compared with zone melting and directing SPS samples, the lattice thermal conductivity of the sample processed by melt Spinning decreases significantly due to the intensive phonon scattering induced by the fine nanostructure. The greatest thermoelectric figure of merit (ZT) of 1.20 is obtained at 300K for the sample which is prepared by melt Spinning with roller linear speed of 10 m/s.
Xiaofang Bi - One of the best experts on this subject based on the ideXlab platform.
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high temperature soft magnetic property of the nanocrystalline fe44co44zr7b5 alloy arising from ge addition
Scripta Materialia, 2009Co-Authors: Yao Sun, Li Zhong, Xiaofang BiAbstract:Melt Spinning Technique was used to prepare FeCoZrBGe, FeCoZrBCu and FeCoZrB alloys. High-resolution electron transmission microscopy observations reveal that the annealed alloys exhibit a typical two-phase microstructure characterized by FeCo nanocrystallites of 10 nm embedded in an amorphous phase. The addition of Ge in the FeCoZrB alloy is found to increase the stability of the residual amorphous phase, resulting in the suppression of grain growth and lower coercivity at elevated temperatures with respect to the Ge-free alloys.
