Effect of metal oxide partial substitution of V2O5 in V2O5–WO3/TiO2 on selective catalytic reduction of NO with NH3

Qing-mao Zhang,Chong-lin Song,Gang Lv,Feng Bin,Hua-ting Pang,Jin-ou Song 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-

After partial substitution of V2O5 in V2O5–WO3/TiO2 by metal oxide (MxOy, M = Fe, Co, Ni, Cu, Sr, La, and Ce), the NO conversions for the MxOy–V2O5–WO3/TiO2 catalysts (M-VW) showed the following sequence: Co–VW > Fe–VW > Sr-VW Ce-VW La-VW > VW > Ni-VW > Cu-VW. The reduction activities for almost all the M-VW catalysts were enhanced at reaction temperature >400 8C, but only the Co-VW catalyst showed an increased activity at temperature <400 8C. Among the M-VW catalysts tested, the Co-VW sample had the highest catalytic activity with a temperature range of 300–550 8C for more than 90% NO removal at a GHSV of 60 000 h1. Moreover, the Co-VW sample exhibited high space- velocity, H2O and SO2 resistance, and low N2O yield. Co partial substitution for V in the VW led to more Lewis acid sites and Brønsted acid sites, and an obvious increase in the ratio of the adsorbed oxygen to the lattice oxygen from 12.74% for VW to 36.73% for Co-VW. The increased adsorbed oxygen and Lewis and Brønsted acid sites contributed to the improved SCR activity of the Co-VW sample.

On functionally-graded crashworthy shape of conical structures for multiple load cases

Tong Pang,Yinfeng Li,Hehe Kang,Guangyong Sun,Jianguang Fang,Qing Li 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.6

Many studies on energy absorbers have been focused on tapered tubes because they have significant advantages in crashworthinessand provide a desired constant load-deflection response. However, few studies have been reported on tapered tubes with nonlinearlyvariablediameters along the longitudinal direction. This paper presents thin-walled Functionally graded tapered tube (FGTT) with a diametervarying nonlinearly subject to axial (0°) and oblique (10°, 20°, 30°) impacts. To explore the advantages of FGTT, conventionalStraight/Conical circular tube (SCT/CCT) with the same mass are compared; and FGTTs with a gradient exponent n > 1 are found to bepreferable to others in terms of energy absorption capacity under small impact angles. Then, crashworthiness analyses of different crushingdistances are conducted and it is found that under a large impact angle (e.g. 20°, 30°), FGTT with a short crushing distance (e.g. 40mm) have a higher mean crashing force than long crushing distance (e.g. 120 mm), especially for n > 1. In addition, the effect of geometricparameters, such as the gradient exponent n and diameter range ΔD between top (incident) and bottom (distal) diameters of FGTTs,are also studied and it is found that the FGTT with ΔD = 40 mm and n > 1 exhibits better crashworthiness than the others under smallimpact angles (0°, 10°). This paper demonstrates that such FGTT structures have a certain potential to be an energy absorber.

Two type III polyketide synthases from Polygonum cuspidatum: gene structure, evolutionary route and metabolites

Lan-Qing Ma,Yan-Wu Guo,Hui-Li Guo,Xing Li,Li-Li Huang,Bo-Ning Zhang,Xiao-Bin Pang,Ben-Ye Liu,Hong Wang 한국식물생명공학회 2013 Plant biotechnology reports Vol.7 No.3

In our recent work (Ma et al., in Planta229(3):457–469, 2009a and 229(4):1077–1086, 2009b),two three-intron type III PKS genes, PcPKS1 and PcPKS2,were isolated from Polygonum cuspidatum Sieb. et Zucc. Phylogenetic and functional analyses revealed PcPKS1 is athree-intron chalcone synthase (CHS) gene, and PcPKS2 isfound to be a three-intron benzalacetone synthase (BAS)gene. The regular CHS encoded by a single intron genehave not been isolated and characterized from P. cuspidatum. In this work a further CHS with one intron (PcPKS3)and a stilbene synthase (STS) gene with three-intron(PcPKS5) were isolated and characterized by functionaland phylogenetic analyses. In comparison with PcPKS1, abifunctional enzyme with both CHS and BAS activity, theenzymatic product of recombinant PcPKS3 was naringenin,bis-noryangonin (BNY) and 4-coumaroyltriacetic acidlactone (CTAL) occurred as side products. The PcPKS5synthesized resveratrol and a trace amount of naringeninfrom p-coumaroyl-CoA. To our knowledge, PcPKS5 is thefirst reported three-intron STS gene in flowering plants. Inthis work, we speculated that this involved a possibleevolutionary route of plant-specific type III PKS superfamilyin P. cuspidatum.

MiR-183-5p Promotes Proliferation, Metastasis and Angiogenesis in Breast Cancer Cells through Negatively Regulating Four and a Half LIM Protein 1

Yi Li,Qing'an Zeng,Jiliang Qiu,Ting Pang,Fenglian Ye,Lin Huang,Xuexia Zhang 한국유방암학회 2020 Journal of breast cancer Vol.23 No.4

Purpose: Four and a half LIM protein 1 (FHL1) is involved in breast cancer (BC) development, but the regulatory mechanism involved remain unclear. In the present study, we examined the role of FHL1 in BC development. Methods: The expression of FHL1, miR-183-5p, and miR-96-5p in BC tissues was analyzed using StarBase analysis. FHL1 expression in BC tissues, a normal human breast epithelial cell line, and BC cell lines was detected using quantitative reverse transcription polymerase chain reaction (qRT-PCR). The relationship between FHL1 and miR-183-5p/miR-96-5p was analyzed via Pearson's rank correlation, TargetScan, and a dual-luciferase reporter assay. BT549 and MDA-MB-231 cells were transfected with either FHL1 and miR-183-5p mimics, or siFHL1 and a miR-183-5p inhibitor, respectively. The viability, colony number, migration, invasion, and tube length of BT549 and MDA-MB-231 cells were examined using cell counting kit-8, colony formation, wound-healing, Transwell, and tube formation assays, respectively. The levels of FHL1, vascular endothelial growth factor (VEGF), p53, E-cadherin, N-cadherin, and vimentin were quantified using western blotting and qRT-PCR. Results: FHL1 expression was downregulated in BC tissues and cells, whereas miR-183-5p and miR-96-5p were upregulated in BC tissues (negative correlation with FHL1 expression). FHL1 overexpression inhibited the viability, colony number, migration, and invasion of BC cells and the expression of VEGF, N-cadherin, and vimentin, and increased the expression of FHL1, p53, and E-cadherin in BT549 cells. Furthermore, a miR-183-5p mimic reversed these effects of FHL1 overexpression, whereas FHL1 silencing caused opposite results to those observed in MDA-MB-231 cells; however, this was reversed by a miR-183-5p inhibitor. Conclusion: Our study suggests that miR-183-5p promotes cell proliferation, metastasis, and angiogenesis by negatively regulating FHL1 in BC.

Synergistic reinforcing of poly(lactic acid)-based systems by polybutylene succinate and nano-calcium carbonate

Jin, Fan-Long,Pang, Qing-Qing,Zhang, Tian-Yi,Park, Soo-Jin Elsevier 2015 Journal of industrial and engineering chemistry Vol.32 No.-

<P><B>Abstract</B></P> <P>Bio-based poly(lactic acid) (PLA) ternary systems were prepared by the solution blending of PLA, polybutylene succinate (PBS), and nano-CaCO<SUB>3</SUB>. The effects of PBS and nano-CaCO<SUB>3</SUB> on the thermal stability, fracture toughness, mechanical properties, and morphology of PLA were investigated using several techniques. The morphology of the systems was observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The fracture toughness and flexural strength of PLA were improved by the introduction of PBS and further enhanced by the addition of nano-CaCO<SUB>3</SUB>. The elastic modulus of PLA decreased with the addition of PBS alone, whereas the elastic modulus increased with the simultaneous addition of PBS and nano-CaCO<SUB>3</SUB>.</P> <P><B>Graphical abstract</B></P> <P>The fracture toughness of PLA was improved by the introduction of PBS and further enhanced by the addition of nano-CaCO<SUB>3</SUB>.</P>

Synergistic reinforcing of poly(lactic acid)-based systems by polybutylene succinate and nano-calcium carbonate

Fan-Long Jin,Qing-Qing Pang,Tian-Yi Zhang,박수진 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-

Bio-based poly(lactic acid) (PLA) ternary systems were prepared by the solution blending of PLA,polybutylene succinate (PBS), and nano-CaCO3. The effects of PBS and nano-CaCO3 on the thermalstability, fracture toughness, mechanical properties, and morphology of PLA were investigated usingseveral techniques. The morphology of the systems was observed by scanning electron microscopy(SEM) and transmission electron microscopy (TEM). The fracture toughness and flexural strength of PLAwere improved by the introduction of PBS and further enhanced by the addition of nano-CaCO3. Theelastic modulus of PLA decreased with the addition of PBS alone, whereas the elastic modulus increasedwith the simultaneous addition of PBS and nano-CaCO3.

Fracture Toughness Improvement of Poly(lactic acid) with Silicon Carbide Whiskers

Shan-Shan Yao,Qing-Qing Pang,Rui Song,Fan-Long Jin,박수진 한국고분자학회 2016 Macromolecular Research Vol.24 No.11

Thermal and mechanical properties of poly(lactic acid)-based ternary composites

( Fan-long Jin ),( Qing-qing Pang ),( Tian-yi Zhang ),박수진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

Bio-based poly(lactic acid) (PLA) ternary composites were prepared by the solution blending of PLA, polybutylene succinate (PBS), and nano-CaCO3. The effects of PBS and nano-CaCO3 on the thermal stability,fracture toughness, mechanical properties, and morphology of PLA were investigated using several techniques. The morphology of the composites was observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). As a result, the fracture toughness and flexural strength of PLA were improved by the introduction of PBS and further enhanced by the addition of nano-CaCO3.

Mechanism optimal design of backhoe hydraulic excavator working device based on digging paths

Jin Chen,Fei Qing,Xiaoping Pang 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.1

In order to solve the problem that hydraulic excavator in the real working process cannot meet the design requirements and reveals insufficientdigging force, a new method on mechanism optimal design of backhoe hydraulic excavator working device based on diggingpaths is introduced and discussed in this paper. Considering the characteristics of consecutive digging process of hydraulic excavator, adigging path is composed of bucket digging trajectories and arm digging trajectories. The feasible working region is divided into a seriesof uniform paths according to the working position of boom. The practical digging performance of excavator is evaluated based on thedigging force parameters under combined work condition of the discrete points on the digging paths. It is turned out that the method ismore accurate to analyze excavator's real-world digging performance via the analysis of some practical cases. Based on the new diggingperformance analysis method, the optimization mathematical model is built to ensure the digging force under combined work conditionand the average digging force of every operating path as big as possible. The layout design of hinge position on the working device isoptimized through genetic algorithm. The optimization result shows that a certain model of an excavator's maximum digging force on thecustomary digging paths is improved by 10% and the average digging force is improved by 4% after the optimization on the workingdevice of the excavator with weak digging force.

Fracture toughness and surface morphology of poly(lactic acid)/poly(ε-caprolactone) blends

( Fan-long Jin ),( Tian-yi Zhang ),( Qing-qing Pang ),박수진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

Poly(lactic acid) (PLA) is considered a material highly suited for industrialization because of its many advantages. However, despite its high tensile modulus and strength, one of the drawbacks of PLA is its poor toughness due to the stiff backbone chain, which restricts its use in many fields. Bio-based PLA blends were prepared by the solution blending of PLA and poly(ε-caprolactone) (PCL). The effect of PCL content on the fracture toughness, mechanical properties, and morphology of PLA was investigated using several techniques. As a result, the fracture toughness of PLA was significantly improved by the addition of PCL.