Influence of Polycaprolactone/Collagen Ratio and Microstructure of FibrousMembranes on Mechanical Properties and Anti-Platelet Properties

Jia-Shuai Zhang,Hui-Lin Mo,Shun-Yang Shen,Du-Han Zhang,Wei Zhang,Yu Ren,Mei-Xian Li 한국고분자학회 2024 폴리머 Vol.48 No.1

In this paper, polycaprolactone (PCL)/collagen (COL) nanofibrous membranes were prepared by electrospinning to study their mechanical properties as well as biocompatibility. The surface morphology was characterized by scanning electron microscopy (SEM) to access the effect of microstructure on the mechanical properties, cytocompatibility, and enzymatic degradation behaviors. In addition, the effect of hydrophilicity of membranes on the antithrombotic properties was also investigated. The results show that tensile strength of PCL/COL10 is higher than that of other samples due to smaller fiber diameters and tight spatial interlacing of PCL/COL10 membranes. In addition, the hydrophobic surface of PCL becomes hydrophilic after the addition of collagen, which affect platelet adhesion and cytocompatibility of nanofibrous membrane samples. The addition of collagen could promote the cell proliferation as well as the enzymatic degradation rate. Overall, PCL/COL10 has good morphology, the best mechanical properties, appropriate degradation rate, and the best antithrombotic effect as well as biocompatibility.

Rolling element-bearing feature extraction based on combined wavelets and quantum-behaved particle swarm optimization

Shuai Zhang,Yongxiang Zhang,Jieping Zhu 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.2

A new approach is proposed to quickly determine the optimal band-pass filter for the resonant demodulation of rolling element bearings. The combined wavelet filter is joined with quantum-behaved particle swarm optimization for optimal filtering. The correlated kurtosisis used as an evaluation index to identify the optimal filtered signal. The proposed approach possesses good band-pass filteringproperties and improves optimal filtering speed and effect to converge rapidly to an optimal solution. Simulation and experiment resultsshow that this approach can generate fault features that are superior to those produced with the classic algorithm. It also shortens the timespent on the same filtering effect in comparison.

Microfluidic Synthesis of Hybrid Nanoparticles with Controlled Lipid Layers: Understanding Flexibility-Regulated Cell–Nanoparticle Interaction

Zhang, Lu,Feng, Qiang,Wang, Jiuling,Zhang, Shuai,Ding, Baoquan,Wei, Yujie,Dong, Mingdong,Ryu, Ji-Young,Yoon, Tae-Young,Shi, Xinghua,Sun, Jiashu,Jiang, Xingyu American Chemical Society 2015 ACS NANO Vol.9 No.10

<P>The functionalized lipid shell of hybrid nanoparticles plays an important role for improving their biocompatibility and <I>in vivo</I> stability. Yet few efforts have been made to critically examine the shell structure of nanoparticles and its effect on cell–particle interaction. Here we develop a microfluidic chip allowing for the synthesis of structurally well-defined lipid-polymer nanoparticles of the same sizes, but covered with either lipid-monolayer-shell (MPs, monolayer nanoparticles) or lipid-bilayer-shell (BPs, bilayer nanoparticles). Atomic force microscope and atomistic simulations reveal that MPs have a lower flexibility than BPs, resulting in a more efficient cellular uptake and thus anticancer effect than BPs do. This flexibility-regulated cell–particle interaction may have important implications for designing drug nanocarriers.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-10/acsnano.5b05792/production/images/medium/nn-2015-05792e_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b05792'>ACS Electronic Supporting Info</A></P>

Bending actuation in a single-layer carbon-nanofiber/polypyrrole composite film and its fabrication

Shuai Zhang,김철 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.7

Thin CNF/PPy composite single-layer films were produced by the electrophoretic deposition and polymerization process which was developed for this study. It was demonstrated that the films could generate a bending motion subjected to an actuating electric voltage even though they consisted of only single-layer. Carbon nanofiber and polypyrrole composite films were obtained from only one side of a working electrode. Several different CNF/PPy films were synthesized, as varying the CNF weight ratios from 3%, 5%, and 7% to 10%. Conductivity of pure PPy and CNF/PPy composite films were measured. Conductivity of the films is improved linearly from 77.9S/cm (pure PPy film) to 124.3 S/cm (10% CNF/PPy) as the CNF weight ratio increases. Adding CNF was effective for improving the conductivity of PPy. As results of electromechanical actuation tests with the films, it was noticed that the strain of the films was reduced a little as the CNF weight ratio increased. Bending motions were observed for both PPy and CNF/PPy films subjected to a voltage. The tip bending deflections was in the range of 0.5 mm to 2 mm. CNF/PPy films showed a great potential to be a good candidate for small light actuators.

A Novel Set-valued Observer Based State Estimation Algorithm for Nonlinear Systems

Shuai Zhang,Zi-Yun Wang,Yan Wang,Zhi-Cheng Ji 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.4

This study considers the state estimation problem for nonlinear models with unknown but bounded noises. A zonotopic set-valued observer based state estimation algorithm is proposed, and the unknown noise term is wrapped in a zonotope during each recursive step. The second-order polynomial Stirling interpolation improves the linearization accuracy and reduces the calculation amount. The method that combines sequence updating and tightening strips reduces the accumulation of errors and improves the estimation accuracy. Finally, the simulations on the Van der Pol nonlinear model and spring-mass-damper nonlinear model can visually illustrate the feasible parameter set variation process and motion trail of the zonotope, which demonstrates the effectiveness and accuracy of the proposed algorithm.

Certain Polymorphisms in SP110 Gene Confer Susceptibility to Tuberculosis: A Comprehensive Review and Updated Meta-Analysis

Shuai Zhang,Fang Zheng,Xue-bin Wang,Ya-di Han,Chen Wang,Ye Zhou 연세대학교의과대학 2017 Yonsei medical journal Vol.58 No.1

Purpose: Numerous studies have assessed the association of SP110 gene variants with tuberculosis (TB), but the results were inconsistent. Through a comprehensive review and meta-analysis, our study aimed to clarify the nature of genetic risks contributedby 11 polymorphisms for the development of TB. Materials and Methods: Through searching PubMed, web of science, China National Knowledge Infrastructure (CNKI) databases,a total of 11 articles including 13 independent studies were selected. The pooled odd ratios (ORs) along with their corresponding95% confidence interval (CI) were estimated for allelic comparisons, additive model (homozygote comparisons; heterozygotecomparisons), dominant model and recessive model. We also assessed the heterogeneity across the studies and publication bias. Results: The results of combined analysis revealed a significantly increased risk of TB for single nucleotide polymorphism (SNP)rs9061 in all five comparisons (allelic comparisons: OR=1.28, 95% CI=1.14–1.44, p<0.0001; homozygote comparisons: OR=2.84, 95%CI=1.84–4.38, p<0.00001; heterozygote comparisons: OR=1.23, 95% CI=1.05–1.43, p=0.009; dominant model: OR=1.32, 95% CI=1.14–1.53, p=0.0003; recessive model: OR=2.26, 95% CI=1.18–4.34, p=0.01). In subgroup analysis, the risk of TB associated with SNP rs9061appeared to be increased. Moreover, increased risk of TB was also found in Asian subgroup of SNP rs11556887, while decreased riskof TB appeared in large sample size subgroup of SNP rs1135791. No significant association was observed between other SNPs andthe risk of TB. Conclusion: Our meta-analysis suggested that the variant of SNP rs9061 might be a risk factor for TB.

Critical Factors in the Decision-making Process of Chinese Mass Taekwondo Consumers: Application of Goal-oriented Behavior Model

( Shuai Zhang ),( Xingyu Xie ),( Shanqing Wan ),( Xiaodai Jia ) 아시아스포츠융합과학회 2021 Asia Pacific Journal of Applied Sport Sciences Vol.2 No.1

PURPOSE This study uses the extended model of goal-oriented behavior to predict and test the behavioral intentions of Chinese public Taekwondo consumers. Based on the original MGB, the study adds five variables related to Taekwondo consumption characteristic to investigate the influencing factors of general Taekwondo consumers' consumption decision-making process. METHOD This study conducts an online survey of 417 students studying in the Chinese Taekwondo Gymnasium and uses IBM SPSS statistical software 26.0 and AMOS 23.0 to analyze the data. Then, the data analysis is divided into two stages. In the first stage, confirmatory factor analysis (CFA) is used to test the reliability and validity of the scale. In the second stage, a structural equation modeling (SEM) analysis is employed to test the proposed hypotheses. RESULT The CFA test shows that the data and the model have a good fit, and the model has high combined reliability and convergence validity. And through the modification of the model, a SEM is established. CONCLUSION The results show that desire has the most significant impact on consumers' behavioral preference, followed by past satisfaction and Taekwondo coach image. Past satisfaction significantly affects desire, which in turn affects consumersʼ behavioral preference. The two constructs of Taekwondo cognition and perspective form a positive and significant relationship. In addition, perspective has developed a considerable influence relationship with past satisfaction and Taekwondo coach image, which influences behavior preferences. Expected emotions significantly affect past satisfaction, which indirectly affects desire and consumer behavioral intentions.

Preparation and electrochemical properties of self-doped nitrogen porous carbon derived from Zn-MOFs

Zhang Dongqiang,Zhang Chi,Wang Qian,Li Shuai,Zhao Xia,Luo Heming 한국탄소학회 2020 Carbon Letters Vol.30 No.3

Metal–organic frameworks (MOFs) are network-like frameworks composed of transition metals and organic ligands con�taining oxygen or nitrogen. Because of its highly controllable composition and ordered porous structure, it has broad appli�cation prospects in the feld of material synthesis. In this work, Zn4(PYDC)4(DMF)2∙3DMF (ZPD) was synthesized via a hydrothermal method. Self-doped nitrogen porous carbon ZPDC-T was then prepared by one-step carbonization. The results show that the self-doped nitrogen porous carbon ZPDC-850 has a micro/mesoporous structure with a specifc surface area of 1520 m2 g−1 and a nitrogen content of 6.47%. When a current density is 1.0 A g−1, its specifc capacitance is 265.1 F g−1 . After 5000 times of constant current charging and discharging, the capacitance retention rate was 79.2%. Thus, self-doped nitrogen porous carbon ZPDC-850 exhibits excellent electrochemical properties and good cyclic stability. Therefore, the self-doped nitrogen porous carbon derived from MOFs can be a promising electrode material for superc

A dynamic human reliability assessment approach for manned submersibles using PMV-CREAM

Zhang, Shuai,He, Weiping,Chen, Dengkai,Chu, Jianjie,Fan, Hao The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.2

Safety is always acritical focus of exploration of ocean resources, and it is well recognized that human factor is one of the major causes of accidents and breakdowns. Our research developed a dynamic human reliability assessment approach, Predicted Mean Vote-Cognitive Reliability and Error Analysis Method (PMV-CREAM), that is applicable to monitoring the cognitive reliability of oceanauts during deep-sea missions. Taking into account the difficult and variable operating environment of manned submersibles, this paper analyzed the cognitive actions of oceanauts during the various procedures required by deep-sea missions, and calculated the PMV index using human factors and dynamic environmental data. The Cognitive Failure Probabilities (CFP) were calculated using the extended CREAM approach. Finally, the CFP were corrected using the PMV index. This PMV-CREAM hybrid model can be utilized to avoid human error in deep-sea research, thereby preventing injury and loss of life during undersea work. This paper verified the method with "Jiaolong" manned submersible 7,000 m dive test. The"Jiaolong" oceanauts CR(Corrected CFP) is dynamic from 3.0615E-3 to 4.2948E-3, the CR caused by the environment is 1.2333E-3. The result shown the PMV-CREAM method could describe the dynamic human reliability of manned submersible caused by thermal environment.

Factors Affecting the Decision Process of Online Purchase of Sports Good under the background of COVID-19: Application of Goal Oriented Behavior Model

( Shuai Zhang ),( Xiao Ren ),( Yanzhang Wang ),( Yongdi Wang ) 아시아스포츠융합과학회 2022 Asia Pacific Journal of Applied Sport Sciences Vol.3 No.1

PURPOSE This study used a sporting goods goal-oriented behavior model (SG-MGB) to predict and test consumers' behavioral intentions for purchasing sporting goods online. Based on the original MGB, the study added three constructs related to online consumption, and examined the factors that influence the online consumer's consumption decision-making process. METHOD A conceptual model containing 13 hypotheses was empirically tested using data from 271 Shanghai residents who have purchased sports goods online in the past 12 months. RESULT The results showed that consumers' positive anticipated emotion, negative anticipated emotion, past behavior frequency, and brand image all positively affected desire. Desire had the most significant positive effect on behavioral intention. Desire played a positive mediating role. CONCLUSION The study found that brand image is an important variable that affects consumers' willingness to buy sports goods online. The SG-MGB is a strong predictive model for online consumers' behavioral intentions.