The Experts below are selected from a list of 30606 Experts worldwide ranked by ideXlab platform
Chunhway Hsueh - One of the best experts on this subject based on the ideXlab platform.
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effects of sn grain orientation on Substrate dissolution and intermetallic precipitation in solder joints under electron current stressing
Scripta Materialia, 2014Co-Authors: T.c. Huang, J-h Ke, Tsunglin Yang, Chunhway HsuehAbstract:Electron current stressing of Ni/Sn3Ag/Ni solder joints was conducted in a straight-line configuration to avoid the complication of current crowding. It was confirmed that Sn grain orientation dominated the dissolution of the Ni Substrate and the precipitation of intermetallic inside Sn3Ag. Current crowding played no role here. Additionally, it was found that the direction of serrated cathode dissolution exhibited a strong correlation with Sn grain orientation. These effects were explained in terms of the extreme aNisotropy of Ni diffusion in Sn.
Zhi Yang - One of the best experts on this subject based on the ideXlab platform.
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one step electrodeposition of Nickel cobalt sulfide nanosheets on Ni nanowire film for hybrid supercapacitor
Electrochimica Acta, 2018Co-Authors: Shusheng Xu, Chen Su, Tao Wang, Jun Hu, Jing Hu, Nantao Hu, Yanjie Su, Yafei Zhang, Zhi YangAbstract:Abstract Bimetallic metal sulfides have been intensely studied as electrode materials for energy storage. However, the synthesis methods are often multi-step. Herein, we proposed a simple one-step electrodeposition of Nickel cobalt sulfide nanosheets on 3D Ni nanowires film. The as-synthesized Ni@Ni–Co–S was directly employed as electrode for supercapacitor. Taking advantages of 3D conductive nanostructure for Ni Substrate and mesoporous nanosheets nature for active material Ni–Co–S, the as-fabricated electrode exhibits a high capacity of 392.8 C cm −3 at 0.5 A cm −3 and excellent rate capability. A hybrid supercapacitor based on Ni@Ni–Co–S positive electrode and rGO-CNTs negative electrode was fabricated for practical supercapacitor application. Our device demonstrated a high energy density of 18.4 mWh cm −3 at a power density of 254.5 mW cm −3 and excellent long term cycle performance with 90.5% capacitance retention after 10000 cycles.
M Toparli - One of the best experts on this subject based on the ideXlab platform.
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transient thermal stress analysis of ceo2 thin films on Ni Substrates using fiNite element methods for ybco coated conductor
Materials & Design, 2007Co-Authors: Erdal Celik, M ToparliAbstract:Abstract The effect of residual stresses of CeO2 buffer layers on Ni Substrate for YBCO coated conductors is considered. CeO2 films were fabricated on Ni tape Substrate from the solutions prepared from alkoxide precursors, solvent, chelating agent and modifying liquid material by using a reel-to-reel sol–gel techNique. SEM observation showed that CeO2 buffer layers had crack-free, pinhole-free and continuous structures and the characteristic feature of the films was grain boundary grooves. FiNite element method (FEM) was used to compute the temperature and stress fields of the sample with CeO2/Ni configuration. The solution was obtained by ANSYS 5.4 analysis programme. The effect of time and residual stresses of the films with different thickness was examined in terms of the FEM results. It was found that the positions of the improved temperature and thermal stresses were considerably affected material properties, time and film thickness for CeO2 buffer layers and the thermal stresses values increased upon increasing the film thickness.
Xia Yu - One of the best experts on this subject based on the ideXlab platform.
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one pot solvothermal synthesis and properties of 1d Nise and Nise Ni3s2 alloyed compound nanorod arrays
ChemInform, 2014Co-Authors: Xia YuAbstract:NiSe nanorod arrays on a Ni Substrate are prepared from Se powder and hexadecyltrimethyl ammoNium bromide dissolved in N2H4·H2 in an autoclave contaiNing a Ni foil (140 °C, 12 h).
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one pot solvothermal synthesis and properties of 1d Nise and Nise Ni3s2 alloyed compound nanorod arrays
New Journal of Chemistry, 2014Co-Authors: Xia YuAbstract:A general one-pot solvothermal route was adopted to produce well-aligned NiSe and NiSe–Ni3S2 compound nanorod arrays on an Ni Substrate. Metal foil was used as Nickel source, and it also favored the uNidirectional diffusion of metal ions, resulting in the vertical growth of one dimensional nanostructures on the Substrate. Elemental mapping showed that the NiSe–Ni3S2 composite was an alloyed nanoheterostructure, which had paramagnetic behavior. Luminescence properties at room temperature indicated that the ultraviolet luminous intensity of the alloy materials could be sigNificantly enhanced through doping Ni3S2 into the NiSe sample.
Erdal Celik - One of the best experts on this subject based on the ideXlab platform.
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Thermal Stress Analysis in ZrO2 Insulation Coatings on Cr-Ni Substrates During Cooling Process
Mathematical and Computational Applications, 2011Co-Authors: Ahmet Okur, Recep Yiğit, Erdal Celik, Onur SaymanAbstract:In this study, thermal stresses analysis of ZrO2 insulation coatings on Cr-Ni Substrate during the cooling process was investigated. A transient thermal analysis was performed using fiNite element method (FEM) via ANSYS software. The temperature versus the time curve obtained from FEM solution was controlled with the temperaturetime diagram measured by a thermocouple. The results obtained from the numerical calculations were improved by the experimental measurement. Additionally, residual stresses were calculated by FEM solutions and they were compared in different points. The compressive and tensile stresses occurred in ZrO2 coating and Cr-Ni Substrate owing to the different thermal expansion coefficients in each material, respectively.
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transient thermal stress analysis of ceo2 thin films on Ni Substrates using fiNite element methods for ybco coated conductor
Materials & Design, 2007Co-Authors: Erdal Celik, M ToparliAbstract:Abstract The effect of residual stresses of CeO2 buffer layers on Ni Substrate for YBCO coated conductors is considered. CeO2 films were fabricated on Ni tape Substrate from the solutions prepared from alkoxide precursors, solvent, chelating agent and modifying liquid material by using a reel-to-reel sol–gel techNique. SEM observation showed that CeO2 buffer layers had crack-free, pinhole-free and continuous structures and the characteristic feature of the films was grain boundary grooves. FiNite element method (FEM) was used to compute the temperature and stress fields of the sample with CeO2/Ni configuration. The solution was obtained by ANSYS 5.4 analysis programme. The effect of time and residual stresses of the films with different thickness was examined in terms of the FEM results. It was found that the positions of the improved temperature and thermal stresses were considerably affected material properties, time and film thickness for CeO2 buffer layers and the thermal stresses values increased upon increasing the film thickness.