Fabrication and characterization of polypyrrole coatings by embedding antimony modified SnO2 nanoparticles

Zhihao Chen,Yijie Jin,Wenzhong Yang,Bin Xu,Yun Chen,Xiaoshuang Yin,Ying Liu 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.75 No.-

Polypyrrole (PPy) coatings were successfully electrosynthesized on the carbon steel by embedding SnO2and Sb-SnO2 nanoparticles (NPs). The associated structural, morphology, hydrophobic, physicalproperties, anti-corrosion and self-healing performance of these coatings were systematically studiedby several tests. XRD results showed that SnO2 had a tetragonal rutile structure and the lattice parametersindicated that Sb ions were successful substituted into SnO2 lattice. The average size of SnO2 NPs wasdecreased by the incorporation of Sb-SnO2 NPs, which were found through TEM images. The contactangle test showed that the hydrophobic of PPy coatings was greatly enhanced by the incorporation of Sb-SnO2 NPs. SEM results revealed that Sb-SnO2/PPy coating exhibited a more compact and uniform surfacethan SnO2/PPy coating, hence the physical barrier effect was significantly strengthened. Theelectrochemical measurements confirmed the excellent anti-corrosion and self-healing ability of Sb-SnO2/PPy coating for a long immersion time in HCl solution. The superior anti-corrosion performance ofSb-SnO2/PPy coating was ascribed to the synergistic effects of the anodic protection combined with theself-healing effect, the excellent physical barrier effect with compact, smooth and hydrophobic coatingsurface as well as the formation of p-n junction with decreased charge transfer.

Preparation of anthocyanin-rich mulberry juice by microwave-ultrasonic combined pretreatment

Kaiqian Xu,Gong-Jian Fan,Cai-e Wu,Andi Suo,Zhihao Wu 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.12

The work aims to study the process of microwave-ultrasonic combined treatment to obtain anthocyanin-rich mulberry juice. A Box-Behnken design was employed to analyze the effects of microwave time and citric acid content on the total phenol content, total anthocyanin content, hue, color intensity, DPPH and ABTS radical scavenging activities. Under the optimum conditions (microwave time of 46 s, citric acid addition of 273 mg/kg), the total phenol content, total anthocyanin content, the DPPH and ABTS radical scavenging activities reached 4.24 mg GAE/mL, 3.29 mg C3G/mL, 4.59 mg TE/mL and 11.90 mg TE/mL, respectively. Subsequently, the mulberry juice was processed with ultrasound of different frequencies. It was found that low-frequency ultrasonic treatment (25 kHz) could significantly reduce the loss of total phenolic and anthocyanin monomers and improve the antioxidant capacity of mulberry juice during storage for five weeks. Overall, mulberry juice with microwave-ultrasonic pretreatment is a natural antioxidant.

A Path Planning Method for Unmanned Surface Vessels in Dynamic Environment

Jiabin Yu,Zhihao Chen,Zhiyao Zhao,Jiping Xu,Yang Lu 제어·로봇·시스템학회 2024 International Journal of Control, Automation, and Vol.22 No.4

A path planning method for unmanned surface vessels (USV) in dynamic environment is proposed to address the impact of dynamic environments on path planning results and the lack of dynamic obstacle avoidance capabilities. First, the considering ocean current rapidly exploring random tree (RRT*) (COC-RRT*) algorithm was proposed for global path planning. The RRT* algorithm has been enhanced with the integration of the virtual field sampling algorithm and ocean current constraint algorithm. The COC-RRT* algorithm optimizes the global planning path by adjusting the path between the parent nodes and child nodes. Second, according to the limitations of the International Regulations for Preventing Collisions at Sea (COLREGs), the improved dynamic window approach (DWA) is applied for local path planning. To enhance the ability of avoid dynamic obstacles, the dist function in the DWA algorithm has been improved. Simulation experiments were conducted in three scenarios to validate the proposed algorithm. The experimental results demonstrate that, in comparison with other algorithms, the proposed algorithm effectively avoids dynamic obstacles and mitigates the influence of the space-varying ocean current environment on the path-planning outcome. Additionally, the proposed algorithm exhibits high efficiency and robustness. The results verified the effectiveness of the proposed algorithm in dynamic environments.

Smooth Path Planning Method for Unmanned Surface Vessels Considering Environmental Disturbance

Jiabin Yu,Zhihao Chen,Zhiyao Zhao,Xiaoyi Wang,Yuting Bai,Jiguang Wu,Jiping Xu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.10

To solve the problems of unsmooth path planning, insufficient dynamic obstacle avoidance ability, and environmental disturbance effect on the path planning result, this paper proposes a smooth path planning method for unmanned surface vessels (USVs) considering environmental disturbance. First, an improved A* algorithm, which uses the path smoothing method based on the minimum turning radius of a USV, is proposed for global path planning. The binary tree method is used instead of the enumeration method to select a relatively optimal path in the current situation to improve algorithm efficiency. In addition, the dynamic window approach (DWA) with the Convention on the International Regulation for Preventing Collision at Sea (COLREGs) constraints is used for local path planning. The dist function in the DWA algorithm is improved to enhance the DWA algorithm’s ability to avoid dynamic obstacles. Finally, the environmental disturbance function is derived and added to the A* and DWA algorithms to handle the effect of environmental disturbances, such as water flow, on the path planning result, which can significantly improve the path-planning ability of the algorithm in the presence of environmental disturbances. Simulation experiments are performed in three scenarios to verify the proposed algorithm. The experimental results show that compared with the other algorithms, the proposed algorithm can effectively avoid dynamic obstacles and reduce the impact of environmental disturbance on the path planning result. At the same time, the proposed algorithm has high efficiency and strong robustness.

Perovskite oxides as transparent semiconductors: a review

He Haiying,Yang Zhihao,Xu Yonghang,Smith Andrew T.,Yang Guangguang,Sun Luyi 나노기술연구협의회 2020 Nano Convergence Vol.7 No.32

Traditional transparent conducting oxides (TCOs) have been widely used for various optoelectronic applications, but have the trade-off between conductivity and transmittance. Recently, perovskite oxides, with structural and chemical stability, have exhibited excellent physical properties as new TCOs. We focus on ­SrVO 3 -based perovskites with a high carrier concentration and ­BaSnO 3 -based perovskites with a high mobility for n-type TCOs. In addition, p-type perovskites are discussed, which can serve as potential future options to couple with n-type perovskites to design full perovskite based devices.

Corrosion inhibition properties of two imidazolium ionic liquids with hydrophilic tetrafluoroborate and hydrophobic hexafluorophosphate anions in acid medium

Yangyang Guo,Bin Xu,Ying Liu,Wenzhong Yang,Xiaoshuang Yin,Yun Chen,Jinxun Le,Zhihao Chen 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-

The ionic liquids, 1-vinyl-3-aminopropylimidazolium hexafluorophosphate ([VAIM][PF6]) and 1-vinyl-3-aminopropylimidazolium tetrafluoroborate ([VAIM][BF4]) acted as the corrosion inhibitors. Weight lossmeasurements showed the corrosion inhibition efficiencies of [VAIM][PF6] and [VAIM][BF4] were 90.53%and 54.01% at 45 C, respectively. The ILs were mix-type inhibitors. Raising the temperature can have adecreased inhibition efficiency of [VAIM][BF4], while [VAIM][PF6] presented an opposite trend. Inaddition, [VAIM][PF6] obeyed Langmuir monolayer adsorption isotherm, while [VAIM][BF4] obeyed EIAwadykinetic-thermodynamic adsorption for blocking active sites. Moreover, Molecular DynamicSimulations showed that [VAIM][PF6] owned a higher adsorption energy, which may be responsible forthe more adsorption groups of [VAIM][PF6].

관비재배시 토마토 생육과 품질에 미치는 폐양액과 기존 비료의 효과

장성호(Cheng Hao Zhang),서지호(Zhihao Xu),강호민(Ho-Min Kang),김일섭(Il Seop Kim) 한국원예학회 2010 원예과학기술지 Vol.28 No.4

일본원시배양액을 공급한 토마토의 펄라이트 배지경에서 배출된 폐양액의 EC는 1.9-2.4dS?m?¹, pH는 5.7-7.1의 범위였으며 다량 원소의 농도는 NH₄?-N가 감소하였을 뿐 대부분 공급양액과 큰 차이가 없었다. 관비용 양액인 Megasol 및 BHF(풍년비료)과 수경재배 폐양액 처리간에 토마토의 초장과 경경 등의 생육에는 차이가 없었으며, 엽록소 함량은 폐양액 처리에서 가장 높았다. 또한 토마토 식물의 생체중과 건물증도 2가지 관비와 폐양액간에 차이는 없이 대조구보다 높은 수치를 나타내었다. 토마토 잎의 무기물 함량도 대조구에 비해 3가지 처리에서 높게 나타났으며, 처리에 따른 차이에 일정한 경향은 없었다. 토마토의 수량과 평균 과중 그리고 과수에서는 폐양액에서 가장 많았으며, 다음으로 Megasol, BHF 그리고 대조구의 순이었는데, 3가지 관비처리간 유의성 있는 차이는 없었다. 특히 배꼽썩음과 발생율은 대조구에 비해 3가지 관비처리에서 모두 낮았는데, 관비처리중 폐양액과 BHF가 가장 낮았다. 토마토 잎의 증산속도는 대조구가 가장 높았으며, 다음으로 BHF, 폐양액, Megasol의 순서였으나 증산속도가 낮았던 관비처리에선 과실의 크기는 오히려 증가하였고, 당도가 증가하는 결과를 가져왔다. 토마토 과실의 당도는 대조구에 비해 관리처리에서 모두 높았으며 관비처리간 차이에 통계적 유의성은 없었다. 수경재배의 폐양액을 이용한 토마토 관비재배에서 생육, 수량, 그리고 품질면에서 기존 관비용 양액에 뒤지지 않는 우수한 결과를 나타내었다. Waste nutrient solution (WNS) that was the drained nutrient solution of Horticultural Research Institute of Japan for culture tomato in perlite hydroponics showed 1.9-2.4 dSㆍm?¹ of EC and 5.7-7.1 pH from April to July. Although NH₄?-N concentration of WNS decreased remarkably, the other nutrients did not change significantly, as compared with supplied solution. There were no significant differences in plant height, stem diameter, and the other growth characteristics of tomato plants grown by 2 fertigation nutrient solutions; BHF (Bountiful Harvest Fertilizer, 10% of N, 13% of PO₄, 13% of K, 0.05% of B, 0.05% of Zn, and 0.0023% of Cu that made in Korea) and Megasol (11% of N, 8% of PO₄, 34% of K, 0.032% of Mn, 0.002% of B, 0.048% of Fe, 0.0122% of Zn, and 0.0023% of Cu that made in Belgium.); however, the chlorophyll content of tomato leaf was highest in WNS. The fresh and dry weight of tomato plants were higher in 3 fertigation treatments than irrigation of tap water, while there were no significant differences in fresh and dry weight among the 3 fertigation treatments. The mineral content of tomato leaf also did not show any differences among the 3 fertigation treatments and any regular tendency in all minerals. Total yield, fruit weight and fruit numbers of tomato were higher in WNS, followed by Megasol, BHF and control, although there were not any difference among the 3 fertigation nutrient solution treatments. BER(blossom-end rot)of tomato fruits decreased in fertigation treatments, especially, fruits grown in WNS and BHF showed lower BER. However, the transpiration rate of leaf was higher in control, followed by BHF, WNS and Megasol, The fruit size and soluble solids content was higher in 3 fertigation nutrient treatments than control. These results suggest that WNS can be used for fertigation solution in tomato because yield and quality of tomato fruit grown in WNS fertigation treatment were similar to those in 2 fertigation nutrient solutions treatments(BHF, Megasol).

The technical analysis and study of decommissioning and abandonment of offshore oil field surface facilities and subsea system

Lu, Guihua,Li, Hongsheng,Xiao, Jianjun,Li, Zhihao,Xu, Minhang Techno-Press 2016 Ocean systems engineering Vol.6 No.3

With more than 100 years exploration and development of offshore oil, more and more offshore oil fields will gradually lose the economic profit to operate. In this article, to take the target oil field for example, the procedure of decommissioning for FPSO, TCMS, subsea system and well abandonment have been analyzed. Meanwhile, the environment impact and mitigation measure have been proposed. The successful project experience will provide a guide line for the offshore facilities decommissioning and abandonment.

DeepPTP: A Deep Pedestrian Trajectory Prediction Model for Traffic Intersection

( Zhiqiang Lv ),( Jianbo Li ),( Chuanhao Dong ),( Yue Wang ),( Haoran Li ),( Zhihao Xu ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.7

Compared with vehicle trajectories, pedestrian trajectories have stronger degrees of freedom and complexity, which poses a higher challenge to trajectory prediction tasks. This paper designs a mode to divide the trajectory of pedestrians at a traffic intersection, which converts the trajectory regression problem into a trajectory classification problem. This paper builds a deep model for pedestrian trajectory prediction at intersections for the task of pedestrian short-term trajectory prediction. The model calculates the spatial correlation and temporal dependence of the trajectory. More importantly, it captures the interactive features among pedestrians through the Attention mechanism. In order to improve the training speed, the model is composed of pure convolutional networks. This design overcomes the single-step calculation mode of the traditional recurrent neural network. The experiment uses Vulnerable Road Users trajectory dataset for related modeling and evaluation work. Compared with the existing models of pedestrian trajectory prediction, the model proposed in this paper has advantages in terms of evaluation indicators, training speed and the number of model parameters.

Physicochemical Properties of Low-Phytate Rice Cultivar, Sang-gol

Chun-Ying Li,He Li,Jae-Keun Choi,Hee-Woong Kim,홍순관,Zhihao Xu,이해익 한국응용생명화학회 2012 Applied Biological Chemistry (Appl Biol Chem) Vol.55 No.1

Phytic acid in grains affects the bioavailability of minerals and nutrients in monogastric animals. Physicochemical properties of Sang-gol, a low-phytate rice cultivar developed to decrease anti-nutrient effect of phytic acid, were compared with those of its parent rice cultivar Il-pum. The amylose content of Sang-gol was lower, but its crude protein content was not significantly different compare with Il-pum. Texture profiles of cooked rice, except for hardness, adhesiveness and chewiness, did not show any differences. The hardness, adhesiveness and chewiness of the Sang-gol were lower than that of Il-pum. Pasting characteristics, peak viscosity, trough, and final viscosity of Sanggol were higher, and breakdown was lower, as compared to Ilpum. Setback of Il-pum was significantly (p <0.01) lower than Ilpum. The pasting temperatures of Sang-gol and Il-pum were very similar (68.1 and 68.0oC), respectively.