Photoelectrochemical energy conversion and electron storage were investigated on hybrid WnormalO3∕TinormalO2 film electrodes. Photoexcitation of WnormalO3∕TinormalO2 was observed to undergo charge accumulation, i.e., double injection of electrons and protons into WnormalO3 to form tungsten bronze by the oxidation of oxalic acid or methanol to form CnormalO2 . It was clearly indicated that hybrid WnormalO3∕TinormalO2 involving highly dispersed WnormalO3 (an amorphous-like WnormalO3 phase) exhibits more effective reversibility for photocharge-discharge processes than a hybrid involving a bulk polycrystalline WnormalO3 . The energy band structure and phase changes of WnormalO3 into tungsten bronze ( normalH0.23WnormalO3 and normalH0.33WnormalO3 ) by photocharge or electrocharge of the hybrid WnormalO3∕TinormalO2 have also been characterized.

Abstract:The local photovoltage of the pn-junction single-crystalline silicon solar cells observed by spot light scanning gradually decreases in the vicinity of edges.

No abstract

The market for used trading card games (TCG) has expanded rapidly in recent years. In the TCG market, the demand for used TCG cards tends to rise in tandem with the release of new products, driving up the prices. Unlike the regularly used market, the used TCG market has some challenges with price increases. We investigated the used market for "Magic: The Gathering," one of the TCGs, to forecast price increases. However, in terms of prediction, there are very few soaring products, almost all of which are classified as "not soaring" and they are of poor precision. Preliminary experiments also revealed that the recall and F1 values were extremely low, resulting in poor prediction performance. Dealing with imbalanced data using three handling techniques, we attempted to increase the recall in this research's predictions of TCG's skyrocketing price. As a result, the handling method improved recall of the methods' ability to predict price increases. Furthermore, we attempted to compare the recall of three methods for dealing with imbalanced data (oversampling, undersampling, and cost-aware learning approach). The outcome demonstrates that the costaware learning approach and random sampling were particularly effective handling methods.