Search results for: Defeng Wu

Items from 1 to 20 out of 104 results

article

Numerical analysis of resistance characteristics of a novel high-speed quadramaran

Xin Liu, Jinglei Yang, Defeng Wu, Liang Hou, more

Polish Maritime Research > 2023 > nr 2 > 11--27

This paper utilised computational fluid dynamics (CFD) technology to calculate the resistance of a novel high-speed quadramaran in calm water using the Navier‒Stokes (N‒S) equation, analysed the total resistance, frictional resistance, and residual resistance characteristics of this novel high-speed quadramaran at different length Froude numbers, and compared them with the results of a conventional...

article

Understanding the fracture toughness of gadolinium‐ and lead‐containing plexiglass

Yujuan Zhang, Xiayu Liu, Yuqing Li, Defeng Wu, more

Polymer Engineering & Science > 63 > 2 > 441 - 453

Toughened gadolinium‐ and lead‐containing plexiglasses (GLCPs) were prepared via copolymerization using ethoxylated bisphenol A dimethacrylate (BPAxEODMA, x = 2, 4, 10) as comonomer and network regulator. As‐obtained modified GLCPs possessed highly improved toughness, with satisfactory shielding and optical performances. The fracture mechanism was studied then in terms of fracture surface analyses...

article

Insight into the role of free volume in irradiation resistance to discoloration of lead‐containing plexiglass

Yujuan Zhang, Zhiyuan Chen, Rui Zhao, Ke Wang, more

Journal of Applied Polymer Science > 139 > 4 > n/a - n/a

Lead‐containing plexiglass is prepared successfully via copolymerization of lead‐methacrylate (Pb(MAA)₂ and the acrylic monomer such as methyl methacrylate, methyl acrylate, ethyl acrylate, and butyl acrylate. The results show that as‐prepared plexiglass has good photons shielding performance and resistance to the discoloration induced by radiation (10 kGy γ‐ray), and the alteration of shielding performance...

article

Rheological and mechanical properties of polylactide nanocomposites reinforced with the cellulose nanofibers with various surface treatments

Zeren Ying, Defeng Wu, Zhifeng Wang, Wenyuan Xie, more

Cellulose > 2018 > 25 > 7 > 3955-3971

As green composites, cellulose nanofiber (CNF) reinforced polylactide (PLA) systems have attracted increasing attention recently. In this work, three forms of CNFs, including pristine, coupled and acetylated ones, were incorporated with PLA through solution casting and injection molding to prepare PLA nanocomposites with different polymer-fiber affinities, and with different dispersion states and...

article

Rheology of the cellulose nanocrystals filled poly(ε-caprolactone) biocomposites

Yuankun Wang, Chunjiang Xu, Defeng Wu, Wenyuan Xie, more

Polymer > 2018 > 140 > C > 167-178

The pristine and acetylated cellulose nanocrystal (CNC) particles were incorporated with poly(ε-caprolactone) to prepare two kinds of green nanocomposite systems: the former is incompatible, while the latter compatible thermodynamically. A rheological study was then performed systematically with various flow fields, including linear and nonlinear dynamic shear flow, creep and start-up flow. Some interesting...

article

The starch nanocrystal filled biodegradable poly(ε-caprolactone) composite membrane with highly improved properties

Chunjiang Xu, Chao Chen, Defeng Wu

Carbohydrate Polymers > 2018 > 182 > C > 115-122

The platelet-like starch nanocrystal (SNC) particles were used to prepare composite membrane with biodegradable poly(ε-caprolactone) (PCL) for the potential packaging membrane application. The presence of SNC particles improves gas barrier properties, tearing strength, as well as the creep resistance of the PCL membrane evidently at the lower loading levels. This improvement effect can be further...

article

Cyclic tensile properties of the polylactide nanocomposite foams containing cellulose nanocrystals

Yaxin Qiu, Qiaolian Lv, Defeng Wu, Wenyuan Xie, more

Cellulose > 2018 > 25 > 3 > 1795-1807

Cellulose nanocrystal (CNC) filled polylactide (PLA) nanocomposites are of interest because both the filler particles and matrix polymer are biodegradable. Foaming with high pressure inert gas is a promising way to open potential applications of this kind of green nanocomposites as lightweight materials. To establish the structure–property relations of this kind of foams is hence of great significance...

article

Differential roles for ArcA and ArcB homologues in swarming motility in Serratia marcescens FS14

Xiaolan Zhang, Defeng Wu, Tengfei Guo, Tingting Ran, more

Antonie van Leeuwenhoek > 2018 > 111 > 4 > 609-617

ArcAB is a two-component regulatory system that can help bacteria respond to and survive in a changing environment. To identify the function of ArcAB homologues in Serratia marcescens FS14, in-frame deletion mutants of the arcA, arcB and arcAB genes were constructed. Surprisingly, ArcB affects the motility of FS14, but ArcA does not. These results are the reverse of those found in Escherichia coli...

article

Finite element modelling on microstructure evolution during multi-pass hot compression for AZ31 alloys using incremental method

Zhaoyang Jin, Kai Yin, Kai Yan, Defeng Wu, more

Journal of Materials Science & Technology > 2017 > 33 > 11 > 1255-1262

Based on the principle of piecewise linearization, the incremental forms of microstructure evolution models were integrated into the thermo-mechanical coupled finite element (FE) model to simulate non-linear microstructure evolution during multi-pass hot deformation. This is an unsteady-state deformation where dynamic recrystallization (DRX), meta-dynamic recrystallization (MDRX), static recrystallization...

article

Morphology and mechanical properties of poly(β-hydroxybutyrate)/poly(ε-caprolactone) blends controlled with cellulosic particles

Jianxiang Chen, Yuankun Wang, Zeren Yin, Kam C. Tam, more

Carbohydrate Polymers > 2017 > 174 > C > 217-225

The rigid microcrystalline cellulose (MCC) particles and semi-rigid ethyl cellulose (EC) were used to control phase morphology and mechanical properties of immiscible poly(β-hydroxybutyrate) (PHB)/poly(ε-caprolactone) (PCL) blends. The interfacial properties were evaluated by the fiber retraction and contact angle methods MCC is incompatible with PHB and PCL, and dispersed independently in the two...

article

Polylactide/basalt fiber composites with tailorable mechanical properties: Effect of surface treatment of fibers and annealing

Zeren Ying, Defeng Wu, Ming Zhang, Yaxin Qiu

Composite Structures > 2017 > 176 > C > 1020-1027

Basalt fiber (BF) was used to reinforce polylactide (PLA) to obtain new composites with potential structural or engineering applications. The composites with pristine BFs present evidently increased strength and modulus relative to neat PLA. After surface treatment, BF shows more evident reinforcing effect because the interfacial energy between BF and PLA decreases sharply from 27.40 to 8.58mJm⁻²...

article

SNP rs3202538 in 3′UTR region of ErbB3 regulated by miR-204 and miR-211 promote gastric cancer development in Chinese population

Yaxiang Shi, Xuan Chen, Biao Xi, Xiaowen Yu, more

Cancer Cell International > 2017 > 17 > 1 > 1-10

Background/aims ErbB3 is an oncogene which has proliferation and metastasis promotion effects by several signaling pathways. However, the individual expression difference regulated by miRNA was almost still unknown. We focused on the miRNAs associated SNPs in the 3′-UTR of ErbB3 to investigate the further relationship of the SNPs with miRNAs among Chinese gastric cancer (GC) patients. Methods We...

article

Transcrystallization of polypropylene in the presence of polyester/cellulose nanocrystal composite fibers

Jing Huang, Chunjiang Xu, Defeng Wu, Qiaolian Lv

Carbohydrate Polymers > 2017 > 167 > C > 105-114

Pristine cellulose nanocrystal (CNC) and acetylated one (aCNC) were used as the modifier to change the surface properties of poly(trimethylene terephthalate) (PTT) fibers for the transcrystallization study of polypropylene (PP). The results reveal that all three kinds of fibers, including the neat PTT, PTT/CNC and PTT/aCNC ones can induce PP transcrystallization. But the PTT/aCNC fiber-filled PP system...

article

Design of three exponentially convergent robust controllers for the trajectory tracking of autonomous underwater vehicles

Lei Qiao, Bowen Yi, Defeng Wu, Weidong Zhang

Ocean Engineering > 2017 > 134 > C > 157-172

This paper deals with the trajectory tracking problem of autonomous underwater vehicles (AUVs) in the presence of dynamic uncertainties and time-varying external disturbances. Three exponentially convergent robust controllers, namely, the min-max type controller, the saturation type controller and the smooth transition type controller are proposed to drive an AUV to track a predefined trajectory....

article

Polylactide/cellulose nanocrystal composites: a comparative study on cold and melt crystallization

Chunjiang Xu, Qiaolian Lv, Defeng Wu, Zhifeng Wang

Cellulose > 2017 > 24 > 5 > 2163-2175

Polylactide (PLA) composites with pristine cellulose nanocrystals (CNC) and acetylated one (aCNC) were prepared for the crystallization study. The roles of CNC and aCNC in cold and melt crystallization of PLA were explored. Both CNC and aCNC have good nucleation activity during cold crystallization of PLA, but also highly impede transport of adjacent chain segments to the growing surface, acting as...

article

Rheological properties of nanocrystalline cellulose suspensions

Yang Chen, Chunjiang Xu, Jing Huang, Defeng Wu, more

Carbohydrate Polymers > 2017 > 157 > C > 303-310

Rheological behavior, including linear and nonlinear, as well as transient rheology of nanocrystalline cellulose (NCC) suspensions was studied in this work. Two kinds of polymer solutions, aqueous poly(vinyl alcohol) (PVA) with flexible chain structure and aqueous carboxymethyl cellulose (CMC) with semi-rigid chain structure, were used as the suspension media to further explore the role that the interactions...

article

Effect of surface modification of cellulose nanocrystal on nonisothermal crystallization of poly(β-hydroxybutyrate) composites

Jianxiang Chen, Defeng Wu, Kam C. Tam, Keren Pan, more

Carbohydrate Polymers > 2017 > 157 > C > 1821-1829

Ring-opening polymerization of l-lactide from cellulose nanocrystal (CNC) surface yielded polylactide-grafted CNC (CNC-g-PLA). The structure and chemical composition of the CNC-g-PLA were characterized by FT-IR, ¹H NMR, XPS and XRD. The crystallization behavior and lamellar structure of poly(β-hydroxybutyrate) (PHB) in the presence of pristine CNC and CNC-g-PLA were elucidated via DSC and SAXS, and...

article

The role of nanocrystalline cellulose during crystallization of poly(ε-caprolactone) composites: Nucleation agent or not?

Qiaolian Lv, Chunjiang Xu, Defeng Wu, Zhifeng Wang, more

Composites Part A: Applied Science and Manufacturing > 2017 > 92 > C > 17-26

Poly(ε-caprolactone) (PCL) composites with pristine nanocrystalline cellulose (NCC) and acetylated nanocrystalline cellulose (aNCC) (with 1.85±0.15 degree of substitution) were prepared. Different roles of NCC and aNCC to the crystallization of PCL were explored. NCC acts as the nucleation agent, promoting the formation of thickened PCL lamellae. Thus, PCL-NCC sample shows higher melting point (T_m...

article

Effects of crop types and nitrogen fertilization on temperature sensitivity of soil respiration in the semi-arid Loess Plateau

Rui Wang, Zhiqi Wang, Qiqi Sun, Man Zhao, more

Soil and Tillage Research > 2016 > 163 > C > 1-9

Temperature sensitivity of soil respiration (Q₁₀) is an important mechanism for the possible feedback between global carbon cycle and climate system. Knowledge of how crop types and nitrogen (N) fertilization affect Q₁₀ is critical for estimating soil respiration and carbon cycling in agro-ecosystem. A two-year field experiment was conducted with cold-resistant (winter wheat; Triticum aestivum L.)...

article

Mechanical properties of thermoplastic polyester elastomer controlled by blending with poly(butylene terephthalate)

Jing Huang, Jun Wang, Yaxin Qiu, Defeng Wu

Polymer Testing > 2016 > 55 > C > 152-159

Thermoplastic polyester elastomer (TPEE) blends with poly(butylene terephthalate) (PBT) were prepared by melt compounding for the phase morphology and mechanical property studies. Although PBT is immiscible with the continuous soft poly(tetramethylene glycol) (PTMEG) phase of TPEE, it is miscible with the discrete hard PBT one of TPEE. Therefore, PBT and TPEE are compatible and their blends reveal...

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INFONA - science communication portal

Search results for: Defeng Wu

Numerical analysis of resistance characteristics of a novel high-speed quadramaran

Understanding the fracture toughness of gadolinium‐ and lead‐containing plexiglass

Insight into the role of free volume in irradiation resistance to discoloration of lead‐containing plexiglass

Rheological and mechanical properties of polylactide nanocomposites reinforced with the cellulose nanofibers with various surface treatments

Rheology of the cellulose nanocrystals filled poly(ε-caprolactone) biocomposites

The starch nanocrystal filled biodegradable poly(ε-caprolactone) composite membrane with highly improved properties

Cyclic tensile properties of the polylactide nanocomposite foams containing cellulose nanocrystals

Differential roles for ArcA and ArcB homologues in swarming motility in Serratia marcescens FS14

Finite element modelling on microstructure evolution during multi-pass hot compression for AZ31 alloys using incremental method

Morphology and mechanical properties of poly(β-hydroxybutyrate)/poly(ε-caprolactone) blends controlled with cellulosic particles

Polylactide/basalt fiber composites with tailorable mechanical properties: Effect of surface treatment of fibers and annealing

SNP rs3202538 in 3′UTR region of ErbB3 regulated by miR-204 and miR-211 promote gastric cancer development in Chinese population

Transcrystallization of polypropylene in the presence of polyester/cellulose nanocrystal composite fibers

Design of three exponentially convergent robust controllers for the trajectory tracking of autonomous underwater vehicles

Polylactide/cellulose nanocrystal composites: a comparative study on cold and melt crystallization

Rheological properties of nanocrystalline cellulose suspensions

Effect of surface modification of cellulose nanocrystal on nonisothermal crystallization of poly(β-hydroxybutyrate) composites

The role of nanocrystalline cellulose during crystallization of poly(ε-caprolactone) composites: Nucleation agent or not?

Effects of crop types and nitrogen fertilization on temperature sensitivity of soil respiration in the semi-arid Loess Plateau

Mechanical properties of thermoplastic polyester elastomer controlled by blending with poly(butylene terephthalate)

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