Study and Design of High Strength and Low Heat Generation Polymer Composites by Molecular Dynamics Simulation

Rui-Rui Zhang,Bin Wu,Peng Chen,Jia-Sheng Qian 한국고분자학회 2020 폴리머 Vol.44 No.6

The molecular dynamics simulation was used to study and design a polymer composites system with excellent mechanical strength and less heat generation in a dynamic process. A series of system factors such as filler loading, surface modification onto filler, and network of cross-linking filler particles on mechanical and heat generation of polymer composites are systematically considered. It is found that the surface grafting onto fillers can restrain the heat generation of polymer composite in the dynamic process, while it shows less effect on the mechanical property. A network of cross-linking filler particles can be fabricated by a combination of grafting chains onto fillers. By filling such a network into the polymer, the mechanical and heat generation properties of polymer composites are significantly improved. Simulation results can help experimental fabrication of polymer composites with excellent mechanical and heat generation properties.

Enhancing hydrogen production efficiency in microbial electrolysis cell with membrane electrode assembly cathode

Jia, Yu Hong,Ryu, Jae Hun,Kim, Cho Hui,Lee, Woo Kyung,Tran, Thi Van Trinh,Lee, Hyo Lee,Zhang, Rui Hong,Ahn, Dae Hee Elsevier 2012 Journal of industrial and engineering chemistry Vol.18 No.2

<P><B>Abstract</B></P><P>Microbial electrolysis cell is a device which can produce hydrogen gas from biomass through microbial catalyzed process and thus reduce the organic matter. For the real application in wastewater treatment, the scale-up of microbial electrolysis cell is an important issue but few tests were conducted with relatively large size. In this study, a 3.7L microbial electrolysis cell (liquid volume 3.2L) equipped with a membrane electrode assembly cathode was designed and tested. The internal resistance was examined, hydrogen generation and organic removal performance was investigated under different conditions. A maximum overall hydrogen efficiency of 41% was achieved at an applied voltage of 1.2V with acetate as substrate, corresponding to a volumetric hydrogen production rate of approximately 0.12m<SUP>3</SUP> H<SUB>2</SUB>/m<SUP>3</SUP> reactor liquid volume/day. The results obtained in this study could help to further develop pilot-MEC for practical applications.</P>

Mobile User Interface Pattern Clustering Using Improved Semi-Supervised Kernel Fuzzy Clustering Method

Jia, Wei,Hua, Qingyi,Zhang, Minjun,Chen, Rui,Ji, Xiang,Wang, Bo Korea Information Processing Society 2019 Journal of information processing systems Vol.15 No.4

Mobile user interface pattern (MUIP) is a kind of structured representation of interaction design knowledge. Several studies have suggested that MUIPs are a proven solution for recurring mobile interface design problems. To facilitate MUIP selection, an effective clustering method is required to discover hidden knowledge of pattern data set. In this paper, we employ the semi-supervised kernel fuzzy c-means clustering (SSKFCM) method to cluster MUIP data. In order to improve the performance of clustering, clustering parameters are optimized by utilizing the global optimization capability of particle swarm optimization (PSO) algorithm. Since the PSO algorithm is easily trapped in local optima, a novel PSO algorithm is presented in this paper. It combines an improved intuitionistic fuzzy entropy measure and a new population search strategy to enhance the population search capability and accelerate the convergence speed. Experimental results show the effectiveness and superiority of the proposed clustering method.

The Effect of Chickpea Dietary Fiber on Lipid Metabolism and Gut Microbiota in High-Fat Diet-Induced Hyperlipidemia in Rats

Jia Han,Rui Zhang,Dina Muheyati,Mei Xia Lv,Wubulikasimu Aikebaier,Bing Xin Peng 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.2

Hyperlipidemia is a metabolic disorder characterized by high lipid levels, which may lead to cardiovascular diseases. Evidence suggests that improving the gut microbiota homeostasis is of great importance in lipid metabolism. Dietary fiber may positively regulate blood lipid and intestinal microbiota, therefore, we have investigated the effect of chickpea dietary fiber (CDF) on high-fat diet (HFD)-induced hyperlipidemia and gut bacterial dysbiosis. Fifty male Sprague Dawley rats purchased for this study were randomly divided into 5 groups of 10 rats each. The control group was fed with normal diet (ND), while the other four groups were all fed with HFD for inducing hyperlipidemia. Then one of the four HFD groups continued to be fed with only HFD, and the other three groups were fed with CDF in different doses: high CDF (30 g CDF/kg of HFD), medium CDF (15 g CDF/kg of HFD), and low CDF (5 g CDF/kg of HFD). After CDF treatment, the lipid level in serum was determined through biochemical methods, and microbial content of the fecal sample was determined by 16S rDNA sequencing. We found that CDF could decrease the levels of total cholesterol, triglyceride, and low-density lipoprotein cholesterol and increase the level of high-density lipoprotein cholesterol significantly. The diversity of gut microbiota in the ND group and CDF-treated groups were higher than HFD group. The β-diversity analysis showed that there were significant differences in gut microbiota among HFD-, ND-, and CDF-treated groups. Rats in CDF groups tended to be similar and interactive. CDF can effectively increase the abundance of Bacteroides and Lactobacillus in rats and increase the level of propionic acid. These results indicated that CDF might affect serum lipid and gut bacterial ecosystem positively.

Naringin and Naringenin Relax Rat Tracheal Smooth by Regulating BKCa Activation

Rui Shi,Jia-Wen Xu,Zi-Ting Xiao,Ruo-Fei Chen,Yi-Lin Zhang,Jia-Bi Lin,Ke-Ling Cheng,Gu-Yi Wei,Pei-Bo Li,Wen-Liang Zhou,Wei-Wei Su 한국식품영양과학회 2019 Journal of medicinal food Vol.22 No.9

Naringin and its aglycone, naringenin, occur naturally in our regular diet and traditional Chinese medicines. This study aimed to detect an effective therapeutic approach for cough variant asthma (CVA) through evaluating the relaxant effect of these two bioactive herbal monomers as antitussive and antiasthmatic on rat tracheal smooth muscle. The relaxant effect was determined by measuring muscular tension with a mechanical recording system in rat tracheal rings. Cytosolic Ca2+ concentration was measured using a confocal imaging system in primary cultured tracheal smooth muscle cells. In rat tracheal rings, addition of both naringin and naringenin could concentration dependently relax carbachol (CCh)-evoked tonic contraction. This epithelium-independent relaxation could be suppressed by BaCl2, tetraethylammonium, and iberiotoxin (IbTX), but not by glibenclamide. After stimulating primary cultured tracheal smooth muscle cells by CCh or high KCl, the intracellular Ca2+ increase could be inhibited by both naringin and naringenin, respectively. This reaction was also suppressed by IbTX. These results demonstrate that both naringin and naringenin can relax tracheal smooth muscle through opening big conductance Ca2+-activated K+ channel, which mediates plasma membrane hyperpolarization and reduces Ca2+ influx. Our data indicate a potentially effective therapeutic approach of naringin and naringenin for CVA.

Mobile User Interface Pattern Clustering Using Improved Semi-Supervised Kernel Fuzzy Clustering Method

Wei Jia,Qingyi Hua,Minjun Zhang,Rui Chen,Xiang Ji,Bo Wang 한국정보처리학회 2019 Journal of information processing systems Vol.15 No.4

Mobile user interface pattern (MUIP) is a kind of structured representation of interaction design knowledge. Several studies have suggested that MUIPs are a proven solution for recurring mobile interface design problems. To facilitate MUIP selection, an effective clustering method is required to discover hidden knowledge of patterndata set. In this paper, we employ the semi-supervised kernel fuzzy c-means clustering (SSKFCM) method tocluster MUIP data. In order to improve the performance of clustering, clustering parameters are optimized byutilizing the global optimization capability of particle swarm optimization (PSO) algorithm. Since the PSOalgorithm is easily trapped in local optima, a novel PSO algorithm is presented in this paper. It combines animproved intuitionistic fuzzy entropy measure and a new population search strategy to enhance the populationsearch capability and accelerate the convergence speed. Experimental results show the effectiveness andsuperiority of the proposed clustering method.

Fall Detection Algorithm for the Elderly Based on Human Characteristic Matrix and SVM

WANG Rui-dong,ZHANG Yong-liang,DONG Ling-ping,LU Jia-wei,ZHANG Zhi-qin,HE Xia 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10

Fall is one of the leading causes of injury and death for the elderly. Real-time fall detection is of great significance for the safety of the elderly. This paper proposes a coarse to fine fall detection algorithm based on Human characteristic matrix and Support Vector Machine (SVM). First, background subtraction and morphological processing are used to obtain more accurately human silhouette. Then, two human characteristic matrices are constructed based on Hu-moment invariant and the information of human body posture extracted from human silhouette and are used as features to train SVM classifier for fall detection. Experimental results indicate that the proposed algorithm can distinguish fall event from other movements such as squat, sitting down and back turning. Compared with other common methods, the proposed method can real-time and efficiently track the video with 18 frames per second.

Photocatalytic degradation of tetracycline with Fe3O4/g-C3N4/TiO2 catalyst under visible light

Liu Rui,Zhang Xin,Han Xue,Sun Yuan,Jin Shuang,Liu Ri-jia 한국탄소학회 2024 Carbon Letters Vol.34 No.1

Fe3O4/g-C3N4/TiO2 catalyst has been fabricated using a simple ultrasonic method with high photocatalytic activity. The morphology, structure and optical properties of Fe3O4/g-C3N4/TiO2 were systematically investigated by a variety of characterization techniques. The optimum degradation conditions were investigated by degrading tetracycline (TC) under visible light irradiation. The results showed that the degradation efficiency was the highest when the initial TC concentration was 5.0 mg/L, the pH value was 11 and the catalyst dosage was 1.0 g/L. After 100 min of visible light irradiation, the degradation efficiency of TC achieved at 73.61%, which was 1.64 and 1.19 times that of g-C3N4 and Fe3O4/g-C3N4, respectively. Moreover, Fe3O4/g-C3N4/TiO2 had good stability and recyclability. The results of capture experiments showed that ‧O2− and ‧OH were the main active species during the photocatalytic process, and a possible photocatalytic reaction mechanism of Fe3O4/g-C3N4/TiO2 catalyst was proposed. This study provides a new way to improve the photocatalytic performance of g-C3N4, which has great potential in degrading pollutants such as antibiotics in wastewater.

MnO2/graphene supported on Ni foam: an advanced electrode for electrochemical detection of Pb(II)

Liu Rui,Zhang Chao-Jun,Han Xue,Wu Tian-Heng,Liu Ri-Jia,Sun Yuan,Jin Shuang 한국탄소학회 2023 Carbon Letters Vol.33 No.3

Graphene-derived materials are an excellent electrode for electrochemical detection of heavy metals. In this study, a MnO2/graphene supported on Ni foam electrode was prepared via ultrasonic impregnation and electrochemical deposition. The resulting electrode was used to detect Pb(II) in the aquatic environment. The graphene and MnO2 deposited on the Ni foam not only improved active surface area, but also promoted the electron transfer. The electrochemical performance towards Pb(II) was evaluated by cyclic voltammetry (CV) and square wave anodic stripping voltammetry (SWASV). The prepared electrode exhibited lower limit of detection (LOD, 0.2 μM (S/N = 3)) and good sensitivity (59.9 μAμM−1) for Pb(II) detection. Moreover, the prepared electrodes showed good stability and reproducibility. This excellent performance can be attributed to the strong adhesion force between graphene and MnO2, which provides compact structures for the enhancement of the mechanical stability. Thus, these combined results provide some technical considerations and scientific insights for the detection of heavy metal ions using composite electrodes.

Icariside II Promotes the Differentiation of Adipose Tissue-Derived Stem Cells to Schwann Cells to Preserve Erectile Function after Cavernous Nerve Injury

Zheng, Tao,Zhang, Tian-biao,Wang, Chao-liang,Zhang, Wei-xing,Jia, Dong-hui,Yang, Fan,Sun, Yang-yang,Ding, Xiao-ju,Wang, Rui Korean Society for Molecular and Cellular Biology 2018 Molecules and cells Vol.41 No.6

Icariside II (ICA II) is used in erectile dysfunction treatment. Adipose tissue-derived stem cells (ADSCs) are efficient at improving erectile function. This study aimed to explore the action mechanism of ADSCs in improving erectile function. ADSCs were isolated from the adipose tissues of rats. Cell proliferation was determined using the Cell Counting Kit-8 (CCK-8) assay. The expressions of mRNA and protein were determined separately through qRT-PCR and western blot. The endogenous expressions of related genes were regulated using recombinant plasmids and cell transfection. A Dual-Luciferase Reporter Assay was performed to determine the interaction between miR-34a and STAT3. Rat models with bilateral cavernous nerve injuries (BCNIs) were used to assess erectile function through the detection of mean arterial pressure (MAP) and intracavernosal pressure (ICP). ICA II promoted ADSCs' proliferation and differentiation to Schwann cells (SCs) through the inhibition of miR-34a. Suppressed miR-34a promoted the differentiation of ADSCs to SCs by upregulating STAT3. ICA II promoted the differentiation of ADSCs to SCs through the miR-34a/STAT3 pathway. The combination of ICA II and ADSCs preserved the erectile function of the BCNI model rats. ADSCs treated with ICA II markedly preserved the erectile function of the BCNI model rats, which was reversed through miR-34a overexpression. ICA II promotes the differentiation of ADSCs to SCs through the miR34a/STAT3 pathway, contributing to erectile function preservation after the occurrence of a cavernous nerve injury.