Influence of Dielectric Barrier Discharge Electrical Properties on the Surface Modification of Polyethylene

Chuan He,Yongqian Wu,Erping Deng,Yawen Zhou,Zhu Zhang,Lijian Ding 한국고분자학회 2024 폴리머 Vol.48 No.1

Dielectric barrier discharge (DBD) is a commonly used plasma surface modification technique, and the power parameters play a crucial role in influencing the modification results. Electrical properties of DBD pulses were studied by varying both power and frequency. Additionally, how these electrical properties influence the chemical and topographical alterations in polyethylene surface modification was investigated. In terms of chemical changes, we found that higher power supply significantly enhances the modification result, whereas alterations in frequency do not exert a substantial impact. Concerning topographical changes, increased power supply yielded similarly effective results, while heightened supply frequency improved the modification result due to the enhanced uniformity of discharge pulses. Regarding hydrophobicity, power supply exerts a more significant and pronounced influence compared to frequency.

Strain Rate Effects on the Mechanical Properties of an AlCoCrFeNi High-Entropy Alloy

Chuan Ting Wang,Yong He,Zhiping Guo,Xiaohui Huang,Ying Chen,Houan Zhang,Yuan He 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7

The efect of strain rate on the compressive properties of an AlCoCrFeNi high-entropy alloy (HEA) was investigated. Microstructure of the AlCoCrFeNi HEA was observed using scanning transmission microscopy (SEM) and transmission electronmicroscopy. The results showed formation of a homogeneous two-phase structure. Quasi-static compression was testedunder initial engineering strain rates between 10–4 and 10–2 s−1. Engineering compression stress of exceeding 2500 MPaand ductility of around 12% was achieved. Dynamic mechanical behavior at room temperature was characterized by a splitHopkinson pressure bar under strain rates between 1350 and 4000 s−1. The AlCoCrFeNi HEA exhibited high strain ratesensitivity, especially under dynamic compression. The fuctuation of yield strength and the variation of strain rate hardening with strain rate was investigated. The various parameters of a constitutive equation for deformation of the AlCoCrFeNiHEA were obtained from the experimental data. The constitutive equations can be applied to predict the strength of alloyunder various stain rates.

A New Hybrid Approach of Clustering Based Probabilistic Decision Tree to Forecast Wind Power on Large Scales

He Chuan,Mansoor Khan,Liu Tianqi,Ullah Farhan 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.2

The wind power forecasting plays a vital role in renewable energy production. Due to the dynamic and uncertain behavior of wind, it is really hard to catch the actual features of wind for accurate forecasting measures. The patchy and instability of wind leading to the assortment of training samples have a main infl uence on the forecasting accuracy. For this purpose, an accurate forecasting method is needed. This paper proposed a new hybrid approach of clustering based probabilistic decision tree to forecast wind power effi ciently. The collected data is screened for noisy information and selected those variables which mainly contribute in accurate predictions. Then, the wind data is normalized using mean and standard deviation to extract playing level fi elds for each feature. Based on the similarity of the data behavior, the K-means clustering algorithm is applied to classify the samples into diff erent groups which contain the historical wind data. Further, the Naïve Bayes (NB) tree is proposed to extract probabilities for each feature in the clusters. The NB tree is a hybrid model of C4.5 and NB methods that successfully applied on three big real-world wind datasets (hourly, monthly, yearly) collected from National Renewable Energy Laboratory (NREL). The forecasting accuracy exposed that the proposed method could forecast an accurate wind power from hours to years’ data. Comprehensive comparisons are made of the proposed method with the most popular state of the art techniques which show that this method provides more accurate prediction results.

Modulatory Potential of LncRNA Zfas1 for Inflammation and Neuronal Apoptosis in Temporal Lobe Epilepsy

Chuan He,Caixia Su,Wentong Zhang,Qin Zhou,Xu Shen,Junjie Yang,Naixian Shi 연세대학교의과대학 2021 Yonsei medical journal Vol.62 No.3

Purpose: This study aimed to elucidate whether lncRNA ZFAS1 is involved in neuronal apoptosis and inflammation in temporal lobe epilepsy (TLE). Materials and Methods: Ninety-six TLE patients were recruited, and their peripheral venous blood was gathered to determine Zfas1 expression with polymerase chain reaction. Neurons were separated from hippocampal tissue of newborn SD rats, and siZfas1 or pcDNA3.1-Zfas1 was transfected into the neurons. Inflammatory cytokines released by neurons were determined, and neuronal activities were evaluated through MTT assay, colony formation assay, and flow cytometry. Results: Serum levels of Zfas1 were higher in TLE patients than in healthy controls (p<0.05). Furthermore, Zfas1 expression in neurons was raised by pcDNA3.1-Zfas1 and declined after silencing of Zfas1 (p<0.05). Transfection of pcDNA-Zfas1 weakened the viability and proliferation of neurons and increased neuronal apoptosis (p<0.05). Meanwhile, pcDNA3.1-Zfas1 transfection promoted lipopolysaccharide-induced release of cytokines, including tumor necrosis factor-α, interleukin (IL)-1, IL-6, and intercellular adhesion molecule-1 (p<0.05), and boosted NF-κB activation by elevating the expression of NF-κB p65, pIκBα, and IKKβ in neurons (p<0.05). Conclusion: Our results indicated that lncRNA ZFAS1 exacerbates epilepsy development by promoting neuronal apoptosis and inflammation, implying ZFAS1 as a promising treatment target for epilepsy.

Study on seismic behavior and seismic design methods in transverse direction of shield tunnels

He, Chuan,Koizumi, Atsushi Techno-Press 2001 Structural Engineering and Mechanics, An Int'l Jou Vol.11 No.6

In order to investigate the seismic behavior and seismic design methods in the transverse direction of a shield tunnel, a series of model shaking table tests and a two-dimensional finite element dynamic analysis on the tests are carried out. Two kinds of static analytical methods based on ground-tunnel composite finite element model and beam-spring element model are proposed, and the validity of the static analyses is verified by model shaking table tests. The investigation concerns the dynamic response behavior of a tunnel and the ground, the interaction between the tunnel and ground, and an evaluation of different seismic design methods. Results of the investigation indicate that the shield tunnel follows the surrounding ground in displacement and dynamic characteristics in the transverse direction; also, the static analytical methods proposed by the authors can be used directly as the seismic design methods in the transverse direction of a shield tunnel.

Low-stiffness spring element constraint boundary condition method for machining deformation simulation

He-chuan Song,Yi-du Zhang,Qiong Wu,Han-jun Gao 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.10

The 3-2-1 constraint principle has been widely applied as the boundary conditions for the finite element method (FEM) to simulate machining deformation of aerospace structure components. However, this principle is inconsistent with the actual contact surface between workpieces and worktables because it provides only three constraint points. These points have rarely been studied in terms of positions and distances. In addition, the applicability of the principle is limited for the workpiece with geometric centers difficult to find or centers without nodes. Therefore, this study proposed a new boundary condition method, low-stiffness spring element constraint method (SECM), drawing on FEM theories and related mechanic theories. With the method proposed this study established the FE model of machining deformation, and then compared the simulation results with both the analytical results and the experimental results of milling and deformation measurements. Good agreement is found between the three results. Finally, this study examined the effect of the three constraint points on simulation of the 3-2-1 principle in terms of point positions and distances. A comparison between SECM and the 3-2-1 principle revealed that SECM is closer to the actual working conditions and more reliable with wider application, which suggests that SECM can replace the 3-2-1 principle as the boundary conditions for the workpiece.

2000 년도 ASEM 개관 기념 사이버 무역 국제세미나 ( 2000 . 6 . 29 ) : 중국의 기업간 전자상거래 ( B2B ) 동향과 전망

하천(He Chuan) 한국통상정보학회 2000 세미나자료집 (동북아 지역의 사이버 무역 동향과 한 중 일 협력방안) Vol.- No.-

Characterization of Ha29, a Specific Gene for Helicoverpa armigeraSingle-nucleocapsid Nucleopolyhedrovirus

Chuan-Xi Zhang,Zhong-Jian Guo,Shi-Heng An,Dun Wang,Yan-He Liu,V. Shyam Kumar 한국생화학분자생물학회 2005 BMB Reports Vol.38 No.3

Open reading frame 29 (ha29) is a gene specific for Helicoverpa armigera single-nucleocapsid nucleopolyhedrovirus (HearSNPV). Sequence analyses showed that the transcription factor Tfb2 motif, bromodomain and Half-A-TPR (HAT) repeat were present at aa 66-82, 4-76, 55-90 of the Ha29 protein respectively. The product of Ha29 was detected in HearSNPV-infected HzAM1 cells at 3 h post-infection. Western blot analysis using a polyclonal antibody produced by immunizing a rabbit with purified GST-Ha29 fusion protein indicates that Ha29 is an early gene. The size of Ha29 product in infected HzAM1 cells was about 25 kDa, which was larger than the presumed size of 20.4 kDa. Tunicamycin treatment of HearSNPV-infected HzAM1 cells suggested that the Ha29 protein is N-glycosylated. Fluorescent confocal laser scanning microscope examination, and Western blot analysis of purified budded virus (BVs), occlusion-derived virus (O DVs), cell nuclear and cytoplasmic fraction, showed that the Ha29 protein was localized in the nucleus. Our results suggested that ha29 of HearSNPV encodes a non-structurally functional protein that may be associated with virus gene transcription in Helicoverpa hosts.

Stability Analysis for T-S Fuzzy Systems with Time-varying Delay via Free-matrix-based Integral Inequality

Yong He,Zhi Lian,Chuan-Ke Zhang,Min Wu 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.1

This paper is concerned with the problem of delay-dependent stability criteria for Takagi-Sugeno systemswith time-varying delay. The less conservative delay-dependent stability criteria in terms of linear matrix inequalitiesare obtained by constructing a novel augmented Lyapunov-Krasovskii functional. In order to further improvethe stability conditions, the free- matrix-based integral inequality is employed. Finally, several numerical exampleson time-delay stability analysis are given to demonstrate the effectiveness and the merits of the proposed methods.

Study on the Flavor Contribution of Phospholipids and Triglycerides to Pork

Ye-Chuan Huang,Hong-Jun Li,Zhi-Fei He,Ting Wang,Gang Qin 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.5

For investigating the flavor contribution of phospholipids and triglycerides to pork, the longissimus muscle of Rongchang (RC) and PIC (bred by PIC Company of England) pig were selectively removed of intramuscular triglycerides or total intramuscular lipids. After cooking, the flavor of different samples was compared by sensory evaluation, gas chromatographymass spectrometry (GC-MS), and electronic nose. The results showed that removing triglycerides had little effect on the aroma of the cooked meat, but when total intramuscular lipids were removed a remarkable difference was observed. The control samples covaried strongly with some lipid-derived products, and the petroleum ether defatted samples also positively related to these compounds,but to a lesser extent, both of them negatively covaried with chloroform-methanol extracted samples which associated with some Maillard reaction products. Moreover the flavor difference between 2 breeds would decrease when triglycerides were removed, and reduce further when phospholipids and triglycerides were removed simultaneously. These results suggested that intramuscular lipids especially phospholipids contributed significantly to pork flavor, the flavor difference between 2 breeds resulted mainly from different intramuscular lipids content and composition.