Nickle nanoparticles highly dispersed on reduced graphene oxide for ammonia decomposition to hydrogen

Tao Meng,Tie-Zhen Ren,Qian-Qian Xu,Yin-Tao Li,Jian-Li Chang,Zhong-Yong Yuan 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-

The Ni/reduced graphene oxide catalysts are synthesized by an in situ hydrothermal method, using thegraphene oxide as the support precursor. The textural and structural properties of the prepared Ni/reduced graphene oxide catalysts are characterized by X-ray diffraction, scanning and transmissionelectron microscopy, thermogravimetric analysis, H2-Temperature-programmed reduction, andelectrochemical impedance spectroscopy. The catalytic performances of the prepared Ni/reducedgraphene oxide catalysts for ammonia decomposition display the enhanced activity. The effect ofreduced graphene oxide support and the influence of nickel content on catalytic activity are evaluated,and the Ni/reduced graphene oxide catalysts exhibit higher catalytic activity than reduced grapheneoxide support and the pure NiO. The ammonia has a conversion of 81.9% and 27.4 mmol/min gcat H2 rateat 700 8C when the 10%-Ni/reduced graphene oxide catalyst used.

Retrofitted built-up steel angle members for enhancing bearing capacity of latticed towers: Experiment

Jian-Tao Wang,Xiao-Hong Wu,Bin Yang,Qing Sun 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.41 No.5

Many existing transmission or communication towers designed several decades ago have undergone nonreversible performance degradation, making it hardly meet the additional requirements from upgrades in wind load design codes and extra services of electricity and communication. Therefore, a new-type non-destructive reinforcement method was proposed to reduce the on-site operation of drilling and welding for improving the quality and efficiency of reinforcement. Six built-up steel angle members were tested under compression to examine the reinforcement performance. Subsequently, the cyclic loading test was conducted on a pair of steel angle tower sub-structures to investigate the reinforcement effect, and a simplified prediction method was finally established for calculating the buckling bearing capacity of those new-type retrofitted built-up steel angles. The results indicates that: no apparent difference exists in the initial stiffness for the built-up specimens compared to the unreinforced steel angles; retrofitting the steel angles by single-bolt clamps can guarantee a relatively reasonable reinforcement effect and is suggested for the reduced additional weight and higher construction efficiency; for the substructure test, the latticed substructure retrofitted by the proposed reinforcement method significantly improves the lateral stiffness, the non-deformability and energy dissipation capacity; moreover, an apparent pinching behavior exists in the hysteretic loops, and there is no obvious yield plateau in the skeleton curves; finally, the accuracy validation result indicates that the proposed theoretical model achieves a reasonable agreement with the test results. Accordingly, this study can provide valuable references for the design and application of the non-destructive upgrading project of steel angle towers.

Analytical behavior of built-up square concrete-filled steel tubular columns under combined preload and axial compression

Jian-Tao Wang,Fa-Cheng Wang 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.38 No.6

This paper numerically investigated the behavior of built-up square concrete-filled steel tubular (CFST) columns under combined preload and axial compression. The finite element (FE) models of target columns were verified in terms of failure mode, axial load-deformation curve and ultimate strength. A full-range analysis on the axial load-deformation response as well as the interaction behavior was conducted to reveal the composite mechanism. The parametric study was performed to investigate the influences of material strengths and geometric sizes. Subsequently, influence of construction preload on the full-range behavior and confinement effect was investigated. Numerical results indicate that the axial load-deformation curve can be divided into four working stages where the contact pressure of curling rib arc gradually disappears as the steel tube buckles; increasing width-to-thickness (B/t) ratio can enhance the strength enhancement index (e.g., an increment of 1.88% from B/t=40 to B/t=100), though ultimate strength and ductility are decreased; stiffener length and lip inclination angle display a slight influence on strength enhancement index and ductility; construction preload can degrade the plastic deformation capacity and postpone the origin appearance of contact pressure, thus making a decrease of 14.81%~27.23% in ductility. Finally, a revised equation for determining strain εscy corresponding to ultimate strength was proposed to evaluate the plastic deformation capacity of built-up square CFST columns.

Path following of a surface ship sailing in restricted waters under wind effect using robust H∞ guaranteed cost control

Jian-qin Wang,Zao-jian Zou,Tao Wang 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.1

The path following problem of a ship sailing in restricted waters under wind effect is investigated based on Robust H∞ Guaranteed Cost Control (RHGCC). To design the controller, the ship maneuvering motion is modeled as a linear uncertain system with norm-bounded time-varying parametric uncertainty. To counteract the bank and wind effects, the integral of path error is augmented to the original system. Based on the extended linear uncertain system, sufficient conditions for existence of the RHGCC are given. To obtain an optimal robust H∞ guaranteed cost control law, a convex optimization problem with Linear Matrix Inequality (LMI) constraints is formulated, which minimizes the guaranteed cost of the close-loop system and mitigates the effect of external disturbance on the performance output. Numerical simulations have confirmed the effectiveness and robustness of the proposed control strategy for the path following goal of a ship sailing in restricted waters under wind effect.

Moving Object Detection and Identification Method Based on Vision

TAO Jian-Ping,LV Xiao-lan,LIU Jun 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.3

In traffic monitoring system, moving object monitor is the key part of monitoring system. This paper proposed a non-reference background detection method based on the reference background model for the poor detection effect of Gaussian background modeling. The model utilizes a series of sampling values to estimate the probability model of observed pixels before current pixels; Then binaryzation moving object detection based on the probability model. In terms of moving object identification, this paper proposed several features, and being trained and identified through BP neural network. The experimental result indicated that this background model can detect the foreground moving object effectively, and achieved satisfied effect on pedestrians and vehicles target recognition rate.

Remarkably efficient hydrolysis of cinnamaldehyde to natural benzaldehyde in amino acid ionic liquids

Duan-Jian Tao,Xiang-Shu Chen,Shu Xu,Feng-Feng Chen,Yan Zhou,Xin Zhao,Li-Li Yu,Kuan Huang 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.12

The hydrolysis of cinnamaldehyde to natural benzaldehyde was investigated systematically using tetramethylammonium- based amino acid ionic liquids as homogeneous catalysts. The results indicated that tetramethylammonium prolinate ([N1111][Pro]) can be a powerful catalyst for the highly efficient hydrolysis of cinnamaldehyde, in which natural benzaldehyde was obtained with almost 94% yield and over 99% selectivity in 1 h. Moreover, kinetic study showed that compared with other catalysts, the catalytic system of [N1111][Pro] has a lower activation energy of 38.30 kJ·mol−1 in the hydrolysis reaction, indicating superior catalytic performance of [N1111][Pro]. Quantum-mechanical calculations further manifested that such high performance originates from the cooperative catalysis of the secondary amino and carboxyl group in the anion [Pro].

Relationships of uPA and VEGF Expression in Esophageal Cancer and Microvascular Density with Tumorous Invasion and Metastasis

Jiang, Jian-Tao,Zhang, Lan-Fang,Zhou, Bin,Zhang, Shun-Qun,Li, Shao-Min,Zhang, Wei,Zhang, Jin,Qiao, Zhe,Kong, Ran-Ran,Ma, Yue-Feng,Chen, Sheng Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.7

Objective: To investigate uPA and VEGF expression in esophageal cancer and relations with tumorous invasion and metastasis. Methods: Immunohistochemistry was used to detect uPA and VEGF expression in the normal epithelial tissue of esophageal mucosa and cancer tissue and detect CD34 labeled micrangium and analyze the relationships with clinical pathological features and tumor angiogenesis. Results: Positive rates for uPA and VEGF protein expression were significantly greater in esophageal cancer than normal epithelial tissue (P < 0.05), the two being linked (P <0.05). In addition, uPA and VEGF protein expression of the high microvessel density (MVD) group was significantly lower than in the low MVD group (P < 0.05), with relation to clinical pathological staging, differentiation and lymph node metastasis (P < 0.05). Conclusion: In esophageal cancer tissue, uPA and VEGF proteins are overexpressed and promote tumor angiogenesis, indicative of a poor prognosis.

Path following of a surface ship sailing in restricted waters under wind effect using robust H_∞ guaranteed cost control

Wang, Jian-qin,Zou, Zao-jian,Wang, Tao The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.1

The path following problem of a ship sailing in restricted waters under wind effect is investigated based on Robust $H_{\infty}$ Guaranteed Cost Control (RHGCC). To design the controller, the ship maneuvering motion is modeled as a linear uncertain system with norm-bounded time-varying parametric uncertainty. To counteract the bank and wind effects, the integral of path error is augmented to the original system. Based on the extended linear uncertain system, sufficient conditions for existence of the RHGCC are given. To obtain an optimal robust $H_{\infty}$ guaranteed cost control law, a convex optimization problem with Linear Matrix Inequality (LMI) constraints is formulated, which minimizes the guaranteed cost of the close-loop system and mitigates the effect of external disturbance on the performance output. Numerical simulations have confirmed the effectiveness and robustness of the proposed control strategy for the path following goal of a ship sailing in restricted waters under wind effect.

Fine mapping and candidate gene analysis of the dwarf gene d162(t) in rice (Oryza sativa L.)

Fan-tao Zhang,Xiao-ling Gao,Ping-rong Wang,Chang-hui Sun,Bing Wang,Xiu-lan Li,Jian-qing Zhu,Xiao-jian Deng 한국유전학회 2011 Genes & Genomics Vol.33 No.1

In our previous study, d162(t), a single recessive gene, which caused rice dwarf mutant, had been mapped on the short arm of chromosome 3. In this study, the d162(t) gene was fine mapped to a confined region about 0.82 cM by RM14641 and RM3134, and co-segregated with InDel361-2, InDel361-3,InDel361-5, RM14645, RM1022 and RM14643, where no known gene involved in plant height has been identified. Based on the annotation results of TIGR, dozens of open reading frames (ORFs) were predicted in this region, among them,five ORFs were the most possible genes related to the phenotype. In these ORFs, Os03g13010, related to U-box domain containing protein, had a 62bp segment deletion in the coding region in 162d (mutant type, MT). The results of RT-PCR showed that the transcriptional level of Os03g13010was significantly different between Shuhui162 (wild type, WT)and 162d (MT). Therefore, the gene (Os03g13010) encoding a U-box domain containing protein was considered as the candidate gene of d162(t).

Tuning the acidity of sulfonic functionalized ionic liquids for highly efficient and selective synthesis of terpene esters

Duan-Jian Tao,Yan Dong,Zhi-Jun Cao,Feng-Feng Chen,Xiang-Shu Chen,Kuan Huang 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.41 No.-

A series of sulfonic functionalized ionic liquids (SFILs) with different acidity were designed and preparedfor the synthesis of terpene esters (e.g. geranyl acetate). The effect of acidity of SFILs on their performancewas investigated systematically. It is found that tuning the acidity of SFILs to an appropriate value resultsin not only high conversion of geraniol but also superior selectivity of geranyl acetate. The SFILs can beeasily separated from products byfiltration under room temperature, thus showing good reusability. Furthermore, the kinetics for SFILs in the esterification of geraniol were determined as the basis for futureprocess design.