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Given a database table with records that can be ranked, an interesting problem is to identify selection conditions for the table, which are qualified by an input record and render its ranking as high as possible among the qualifying tuples. In this paper, we study this standing maximization problem, which finds application in object promotion and characterization. After showing the hardness of the...
The optical generation rate and surface recombination velocity (SRV) increasing with the created nano-holes depth, width, and number on the emitter layer of a thin-film silicon solar cell are studied. The trade-off between the optical generation rate and surface recombination velocity was exhibit in short-circuit current density (Jsc), Open-circuit voltage (Voc), and conversion efficiency (η) using...
Impressive efficiency enhancement of 15.38% of crystalline-silicon solar-cell with Eu-doped silicate-phosphors and SiO2-layer using spin-on technique is demonstrated. Reflectance, external quantum efficiency, and photovoltaic I-V characteristics are used to examine the downshifting effectiveness.
Performance enhancement of the p-n junction silicon solar cells with ITO/Al2O3/TiO2 antireflective coating is experimentally demonstrated. The reflectivity of the ITO/Al2O3/TiO2 layer configuration with various thicknesses on Si wafer are simulated and characterized. Optical reflection and external quantum efficiency of the proposed MOS-structure Si solar cells are measured and compared with the changing...
In this study, the fabrication of thin porous anodic aluminum oxide (AAO) templates with controllable thickness of 400–1300 nm is demonstrated. One-step anodizing method is used to generate AAO template with hexagonal porous distributed profile. The pore diameter pore-widening and AAO barrier layer thinned down are investigated. The morphologies and pore structures of the fabricated AAO templates...
Flexible microelectrode array (MEA) has been widely used in neural prosthesis, such as artificial retinal chip. Specially, this sort of MEA for highly efficient electrical stimulation is more urgently required. In this work, a 3D flexible parylene-metal structure was fabricated by structure transfer technique. Silicon wafer was etched by deep reactive ion etching and isotropic wet etching sequentially...
A new family of single-phase four switches Z-source AC-AC converter are proposed, including voltage-fed and current-fed. Compared to the traditional ac-ac converters, they have unique features: providing a larger range of output ac voltage with buck-boost, reversing or maintaining phase angle, reducing in-rush and harmonic current. A new commutation strategy for single-phase four switches Z-source...
Two-phase convective flow in micro channels has numerous promising applications such as electronic cooling. This study investigates evaporation phenomena and capillary-driven heat in a rectangular micro channels structure with hydraulic diameters of 100 ~ 250nm and length of 75mm. The micro channels made of (110)-orientated silicon is fabricated by bulk micromachining. The temperature distributions...
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