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With the increasing size of the wind farms, the impact of the wake effect on the energy yields and lifetime consumption of wind turbine can no longer be neglected. In this paper, the affecting factors like the wind speed and wind direction are investigated in terms of the single wake and multiple wakes. As the power converter is the most fragile component among the turbine system, its lifetime estimation...
In this paper, the physical mechanism and models of oxide-based resistive-switching random access memory (RRAM) and the optimization of the devices and arrays are addressed and reviewed. The review focuses on our research achievements on the unified physical mechanism, physical-based models including switching and reliability behaviors, and the optimization design issues of the oxide-based RRAM.
High quality fiber-optic-connector termination is challenging for automation due to difficulty in handling variety of cable-types. Commscope has overcome this hurdle by developing a ferrule-stub-assembly process that is fusion-spliced to a cable by machine automated-process.
White tin (or β-Sn) has a body-center tetragonal (BCT) crystal structure with lattice parameters of a = b = 5.83 Å and c = 3.18 Å. We found that the orientation of the β-Sn phase strongly correlated with the Ag content in the Sn-Ag-Cu solder joints. When the Ag content is equal to or greater than 3 wt.%, the Sn grains display a strong preferred orientation of the c-axes in the direction parallel with...
Conventional assessment of solder joint reliability uses either ball shear test or solder ball pull test. The test results are reported in terms of materials strength in either shear or tensile mode, and the strength values are size-dependent. Therefore these test results are largely useful only for qualitative comparison and qualification of the products. In the current effort, we aim at developing...
The thermal fatigue data of two Sn-based Pb-free solders (Sn95.4/Ag3.9/Cu0.7, Sn96.5/Ag3.5) are presented. The test vehicles (LCCC mounted on FR-4 PCB) are subjected to various thermal cycling conditions; a constant temperature excursion (T = 100degC) with different cyclic mean temperatures and dwell times. The results are compared with the results of Sn63/Pb37. The results show that the two Pb-free...
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