High performance fractional motion estimation in h.264/avc based on one-step algorithm and 8×4 element block processing

In this work, reduced graphene oxide (rGO) nanocomposites doped with nitrogen (N), sulfur (S) and transitional metal (Ni, Co, Fe) were synthesized by using a simple one-step in-situ hydrothermal approach. Electrochemical characterization showed that rGO-NS-Ni was the most prominent catalyst for glucose oxidation. The current density of the direct glucose alkaline fuel cell (DGAFC) with rGO-NS-Ni as the anode catalyst reached 148.0 mA/cm2, which was 40.82% higher than the blank group. The DGAFC exhibited a maximum power density of 48 W/m2, which was more than 2.08 folds than that of blank group. The catalyst was further characterized by SEM, XPS and Raman. It was speculated that the boosted performance was due to the synergistic effect of N, S-doped rGO and the metallic redox couples, (Ni2+/Ni3+, Co2+/Co3+ and Fe2+/Fe3+), which created more active sites and accelerated electron transfer. This research can provide insights for the development of environmental benign catalysts and promote the application of the DGAFCs.

Download Full-text

A One-Step Visual-Inertial Ego-Motion Estimation using Photometric Feedback

IEEE/ASME Transactions on Mechatronics ◽

10.1109/tmech.2021.3057887 ◽

2021 ◽

pp. 1-1

Author(s):

Shixin Tan ◽

Shangkun Zhong ◽

Pakpong Chirarattananon

Keyword(s):

Motion Estimation ◽

One Step

Download Full-text

Facile Synthesis of Uniform Mesoporous Nb2O5 Micro-Flowers for Enhancing Photodegradation of Methyl Orange

Materials ◽

10.3390/ma14143783 ◽

2021 ◽

Vol 14 (14) ◽

pp. 3783

Author(s):

Jian-Qing Qiu ◽

Huan-Qing Xie ◽

Ya-Hao Wang ◽

Lan Yu ◽

Fang-Yuan Wang ◽

...

Keyword(s):

Methyl Orange ◽

Active Sites ◽

High Performance ◽

Diffuse Reflectance Spectroscopy ◽

X Ray Diffraction ◽

Flower Structure ◽

Electron Microscopies ◽

Bet Method ◽

One Step ◽

Catalytic Active Sites

The removal of organic pollutants using green environmental photocatalytic degradation techniques urgently need high-performance catalysts. In this work, a facile one-step hydrothermal technique has been successfully applied to synthesize a Nb2O5 photocatalyst with uniform micro-flower structure for the degradation of methyl orange (MO) under UV irradiation. These nanocatalysts are characterized by transmission and scanning electron microscopies (TEM and SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) method, and UV-Vis diffuse reflectance spectroscopy (DRS). It is found that the prepared Nb2O5 micro-flowers presents a good crystal phases and consist of 3D hierarchical nanosheets with 400–500 nm in diameter. The surface area is as large as 48.6 m2 g−1. Importantly, the Nb2O5 micro-flowers exhibit superior catalytic activity up to 99.9% for the photodegradation of MO within 20 mins, which is about 60-fold and 4-fold larger than that of without catalysts (W/O) and commercial TiO2 (P25) sample, respectively. This excellent performance may be attributed to 3D porous structure with abundant catalytic active sites.

Download Full-text