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Table of Content

    28 February 2019, Volume 25 Issue 1
    Precision and Translational Medicine
    Dysfunction of mitochondrial in mice with non-alcoholic steatohepatitis
    HOU Wenlin, PAN Wen, FU Siyi, SONG Meiyi, WANG Fei
    2019, 25(1):  1-9.  doi:10.12066/j.issn.1007-2861.2086
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    [Objective] This research is to study the changes of mitochondrial function in non-alcoholic steatohepatitis (NASH). [Methods] The method is to use C57BL/6 mice fed with choline methionine deficient (MCD) diet to induce a mouse NASH model. The choline methionine sufficient (MCS) group serves as the control group. Four weeks later, serum and liver tissue are detected when mice are sacrificed. Biochemical indicators of serum alanine aminotransferase (ALT) activity, aspartate aminotransferase (AST) activity, liver triglyceride (TG), total cholesterol (TC) levels are detected by enzymelinked immunosorbent assay. Pathological examination has also been performed. The mtDNA/nDNA and nDNA in liver tissue of mice and the expression of genes encoded by mitochondrial DNA, mitochondrial DNA replication and associated with energy metabolism in mouse liver are tested by qRT-PCR (quantificational real-time polymerase chain reaction). [Results] Compared with the MCS group, the MCD model group shows severe degeneration of liver tissue, and ALT, AST, and TG become significantly elevated, but TC levels are decreased. A large amount of fat vacuoles, severe destruction of lobular structure, and significant infiltration of inflammatory cells become increased in MCD model. In addition, the amount of mitochondrial is decreased. Furthermore, the capacity of energy metabolism and DNA repair of the MCD model group are significantly reduced. [Conclusion] Mitochondrial dysfunction occurs in mice with non-alcoholic steatohepatitis.

    Role of miR-19b in protecting cardiomyocytes from apoptosis by activating Akt signaling
    ZHU Hongwen, YU Pujiao, XU Jiahong
    2019, 25(1):  10-17.  doi:10.12066/j.issn.1007-2861.2097
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    [Objective] The purpose of the research is to investigate the effects of miR-19b on apoptosis and its underlying mechanisms in the oxygen glucose deprivation/reperfusion (OGD/R) model of neonatal rat cardiomyocytes (NRCMs). [Methods] NRCMs are obtained from neonatal rats by enzymatic hydrolysis and then transfected by miR-19b mimics and miR-19b inhibitor for the following study. A model of OGD/R has been built in NRCMs to mimic myocardial ischemia and reperfusion injury (MIRI). Terminal deoxynucleotidyl transferase (TdT)-mediated 2'-deoxyuridine 5'-triphosphate (dUTP)-biotion nick end labeling (TUNEL) assay has been performed to detect cardiomyocyte apoptosis. Western blot has been applied for detecting the expression of apoptotic proteins (Bcl2, Bax and Caspase3) and the downstream proteins of miR-19b. TUNEL staining indicates that miR-19b mimics could reduce the ratio of TUNEL positive nucleus to total nucleus and miR-19b inhibitor has opposite effects. [Results] Results based on western blot support the observations above. Moreover, miR-19b mimics could down-regulate the expression of phosphatase and tensin homolog (PTEN) and activate Akt signaling while miR-19b inhibitor has opposite effects. The rescue experiment has confirmed that PTEN-siRNA could reverse the promotion of miR-19b inhibitor on cardiomyocyte apoptosis. [Conclusion] miR-19b may protect cardiomyocytes from apoptosis through the activation of Akt signaling via regulating PTEN negatively.

    Correlation between blood lipid levels in early pregnancy and preeclampsia
    LIN Nan, GU Wei, HUA Renyi, HOU Yanyan
    2019, 25(1):  18-23.  doi:10.12066/j.issn.1007-2861.2045
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    [Objective] To explore the connection between blood lipid levels in early pregnancy and the risk of preeclampsia. [Methods] To analyze 272 cases with preeclampsia who received routine examination and gave birth in International Peace Maternity and Child Health Hospital, Shanghai Jiao Tong University School of Medicine from January to December in 2015. Controls were 300 healthy pregnant women at the same stage of delivery. The levels of serum total cholesterol (TC), triglyceride (TG), high density lipoprotein (HDL), low density lipoprotein (LDL), apolipoprotein A (ApoA), apolipoprotein B (ApoB) and lipoprotein a (LPa) were detected in early pregnancy ((11+3)~(13+6) weeks), and atherosclerosis index (AI), TC/HDL, TG/HDL, LDL/HDL and ApoB/ApoA were calculated. The receiver operating characteristic (ROC) curve was used to predict preeclampsia. [Results] The levels of TG, LDL, ApoB, AI, TC/HDL, TG/HDL, LDL/HDL and ApoB/ApoA of the preeclampsia group were significantly higher than those of the control group ($P\!<\!0.05$). There were no significant differences in the levels of TC, LPa, HDL and ApoA between the two groups ($P\!>\!0.05$). The ROC curve indicated that TG/HDL had predictive value for preeclampsia ($P\!<\!0.05$). Area under the curve (AUC) was 0.843, the critical value was 1.49, sensitivity 67.7%, specificity 91.7%. [Conclusion] Patients with preeclampsia had significant abnormal hyperlipidemia metabolism in early pregnancy. TG/HDL may be a reference predictor of the risk of preeclampsia.

    Research Articles
    Wireless channel measurements and analysis at 1.8 GHz in a tunnel environment
    PEI Xindong, YIN Xiaoyu, WU Yiming, ZHENG Guoxin
    2019, 25(1):  24-34.  doi:10.12066/j.issn.1007-2861.1885
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    The long term evolution-metro (LTE-M) method based on multiple input multiple output (MIMO) technology will be used in the next generation urban rail transit train control systems. As LTE-M works in the 1.8 GHz band, it is important to study wave propagation characteristics in a tunnel environment at 1.8 GHz. Using a wideband spread spectrum sequence and the virtual MIMO method, the key radio channel characteristics of a tunnel at 1.8 GHz are investigated, including path loss, root mean square (RMS) delay spread, and MIMO channel capacity. The results show that the path loss factor in a tunnel environment at 1.8 GHz is lower than that in a free space, and changes in the tunnel cross-sectional area can affect electromagnetic wave propagation. Besides, the larger the number of MIMO antenna array elements, the greater the capacity. Changing the antenna spacing can change MIMO capacity.

    ERPs on situation modification and cognitive reappraisal strategy
    GUO Cheng, LI Yingjie
    2019, 25(1):  35-44.  doi:10.12066/j.issn.1007-2861.1900
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    In this study, event-related potential was used to investigate different modulation effects of the strategies of situation modification and cognitive reappraisal on the processing of negative emotional stimuli. Twenty female under graduate participants were instructed to perform four tasks: viewing neutral pictures, viewing negative pictures, modification of negative pictures and reappraisal of negative pictures. Scene pictures from an international affective picture system were used as stimulus materials. Electroencephalography (EEG) was recorded from 32 scalp electrodes in the whole process. The late positive potential (LPP) grand average waveforms were analyzed off-line. The following observations were made. 1) Negative emotional experiences were significantly reduced after situation modification and cognitive reappraisal. 2) The modulation effect of situation modification on LPP appeared earlier than viewing of negative pictures. A significant decrease in LPP started at about 800 ms after stimulus onset. 3) Reappraisal began to modulate LPP on 1 600---3 200 ms. These results suggest that situation modification strategy is an effective way to modulate negative emotion. It is inferred that modification strategy intervenes in the emotion-generative trajectory earlier than the reappraisal demonstrated by the earlier modulation of LPP. This study enriches the dynamic model of emotion regulation, and provides evidence for emotional regulation strategy.

    Simulation of time-variant channel for train-ground LTE-M system in tunnel environment
    WU Huize, ZHENG Guoxin
    2019, 25(1):  45-55.  doi:10.12066/j.issn.1007-2861.1893
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    To build a physical channel test platform to validate reliability of time division long term evolution (TD-LTE) technology for rail transit communication based train control (CBTC), it is necessary to set up a train-ground communication channel model. In this paper, a time-frequency analysis method is used to study the Doppler effect of a wireless time-varying channel in tunnel environments, especially when the train passes through the rail-side base station. Doppler spread based on a multiplicative spread factor is proposed. A channel model suited to physical realization with RF circuits is established. Effectiveness of the method is verified by ray tracing.

    Front-vehicle detection method based on monocular vision
    CHEN Gaopan, XU Meihua, WANG Qi, GUO Aiying
    2019, 25(1):  56-65.  doi:10.12066/j.issn.1007-2861.1889
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    To speed and improve accuracy of front-vehicle detection, limitations of Qtsu threshold and poor robustness of cumulative-density-function (CDF) threshold in the extraction of region-of-interest (ROI) are analyzed. An artificial neural network (ANN) method is used to fit threshold point to improve accuracy and robustness of the threshold and reduce false ROIs. A region-hexagon-segmentation method is presented to deal with overlap between vehicle region and background in a complicated environment for reducing misdetection. Haar features in the ROIs are extracted, and the ROIs are classified with an optimized adaptive boosting (AdaBoost) classifier to get real vehicle target. Experiments show that processing speed using the proposed method is 81.3 frames per second for a 640$\times $480 video with an error rate of 3.8%.

    Stereo matching algorithm based on multi-feature fusion and tree structure aggregation
    YU Huaibo, HU Yueli, XU Jie
    2019, 25(1):  66-74.  doi:10.12066/j.issn.1007-2861.1987
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    reo matching in texture and depth discontinuities, a stereo matching algorithm based on multi-feature fusion and tree structure aggregation was proposed. The first step was color image fusion, gradient image Census transform and cost calculation. Next came the matching cost aggregation in the minimum spanning tree generated by the original image. Then the accuracy of stereo matching was further improved through using multi direction scanning line optimization. Finally, through using the left and right consistency check, error matching points were marked and parallax correction is made. In order to verify the effectiveness of the proposed algorithm, and the first set of test images provided were tested using the Middlebury test, and the average error rate is 6.38%; then on both actual scene images error rate testing for depth information extracted was conducted, and the test scenarios point to error rates at 5.76% and 5.55% respectively, demonstrating the practicality of the algorithm.

    Preparation and properties of electroless Cu plated Kevlar fiber via non-etching and Pd-free activation
    GAO Yufang, PENG Yuqing, SUN Ningxia, LI Aijun, BAI Ruicheng
    2019, 25(1):  75-83.  doi:10.12066/j.issn.1007-2861.1897
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    Surface pretreatment is a key process in preparation of high-performance metallization Kevlar fiber. Electroless Cu plating was conducted on a Kevlar fiber using a new pretreatment method called non-etching and Pd-free activation with dimethyl amine-borane as the reducing agent. Chemical compositions, crystal structure and surface morphology of the coatings were investigated using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscope (SEM). Adhesion strength, mechanical properties and thermal stability of the coatings were evaluated. The results showed that the obtained Cu deposit was continuous and compact, and possessed high adhesion with the Kevlar fiber. The Cu plated Kevlar fiber maintained excellent mechanical properties and thermal stability.

    Application of carbon-based solid acid catalysts in preparing biodiesels
    ZHANG Baohua, XU Liying, QI Yong, ZHANG Huiying, Lü Xiaoqing
    2019, 25(1):  84-94.  doi:10.12066/j.issn.1007-2861.1895
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    Optimization of the esterification reaction condition was investigated by orthogonal experiments using carbon-based acid as catalyst prepared by p-toluenesulfonic acid and starch. In a pilot scale study, biodiesels were produced from waste oil in an acid-base cascade process. It was found that the carbon-based solid catalysts displayed high activity under an optimization condition, which was 60 ${^\circ}$C for 7 h, with 30% methanol and 4% catalysts of waste oil. The acid value of waste oil can be reduced to 1.2 mg KOH/g after esterification. It was concluded that the carbon-based solid acid catalysts were proper to be used in biodiesel production from waste oil of acid-base process instead of liquid acid catalysts.

    Process optimization of fluorinated ethylene propylene product based on the optimal projection recognition method
    XU Xiao, LU Kailiang, JIANG Ruoning, ZHAO Hongtao, LI Junwei, LU Wencong
    2019, 25(1):  95-100.  doi:10.12066/j.issn.1007-2861.2088
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    The process data of production can be utilized to investigate the regularity of production quality by using data mining, which is an effective method in industrial optimization. Furthermore, it is expected that the optimal model can be constructed in a fast and automatic way. In this project, the optimal projection recognition technique was proposed to construct the pattern recognition model for classifying different qualities of fluorinated ethylene propylene (FEP) concerning melt index. It was found that the qualified accuracy of production increased remarkably after the application of the optimal model available.

    Degradation of sulfamethoxazole in aqueous solution by electron beam
    YUAN Debao, DENG Fei, MAO Wen, ZHAO Tao, HU Mian, WU Minghong, XU Gang
    2019, 25(1):  101-108.  doi:10.12066/j.issn.1007-2861.1904
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    Sulfamethoxazole (SMX) is a widely used antibacterial drug. It is hard to degrade effectively in aqueous solutions in a traditional wastewater treatment process. This study focuses on SMX degradation using an advanced oxidation technique, electron beam radiation, to investigate effects of different factors on degradation. The results show that the degradation rate of electron beam for SMX is high. SMX is almost completely degraded at 5 kGy. Degradation of SMX obeys a pseudo first-order kinetic equation. Alkaline condition and proper amount of H$_2$O$_2$ are beneficial to the degradation. Hydroxyl radical and electron play an important role in the degradation of electron beam. Intermediates can be detected with ion chromatography (IC) and liquid chromatography-tandem mass spectrometry (LC-MS-MS). Several degradation pathways are proposed.

    Preparation of Cu/ZnO/MCM-41 catalyst with double-solvent impregnation method and catalytic performance in methanol synthesis by CO$_{\textbf{2}}$ hydrogenation
    ZHANG Chen, LIAO Peiyi, SHI Zhibiao, SUN Jian, WANG Hui
    2019, 25(1):  109-119.  doi:10.12066/j.issn.1007-2861.1903
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    Cu/ZnO/MCM-41 catalyst was prepared via a double-solvent impregnation method, and its catalytic performance of CO$_{2}$ hydrogenation to methanol was investigated. The water-ethylene glycol double solvent formed by adding an appropriate amount of ethylene glycol to the metal nitrate aqueous solution in the impregnation process promoted metal ions into the channels of MCM-41 support, resulting in the formation of metal particles with very small size. Metal particles were uniformly embedded in MCM-41 channels. The relatively low reduction temperature indicated highly dispersed active sites with strong interaction between Cu and ZnO. Cu/ZnO/MCM-41 catalysts prepared with the method had stable catalytic performance in hydrogenation of CO$_{2}$ to methanol. By adjusting loading to control the particle size of Cu, the methanol selectivity and yield could reach 64.3% and 32.8 g$\cdot$(kgcat)$^{-1 }\cdot$h$^{-1}$. Therefore the double-solvent impregnation method can effectively limit migration and sintering of active components with optimized particle size, so as to obtain catalysts with highly dispersed active sites and stable catalytic performance.

    Static parameter identification of cantilever cracked beam with nonholonomic constraint boundary
    YANG Xiao, MENG Zhe, HUANG Jin
    2019, 25(1):  120-131.  doi:10.12066/j.issn.1007-2861.1878
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    A method of static parameter identification for boundary supporting compliance and the degree of crack damage of cantilever cracked beam with nonholonomic constraint boundary is developed. First, regarding the nonholonomic constraint boundary of the beam as a vertical and rotational spring, and the crack in a beam as an equivalent internal rotational spring, an explicit closed-form solution to static bending of cantilever Euler-Bernoulli cracked beam is derived. According to the properties of piecewise linear functions of damage-induced deflection and crack-induced chord deflection the formulae of boundary elastic supporting compliances and the degree of crack damage are derived. Numerical experiments are performed to show validity and reliability of the proposed method, and influences of factors such as deflection measurement noise and crack depth on the identification results are examined numerically. It is revealed that parameter identification errors increase as a whole with increase of deflection measurement errors. Nonetheless, the results are acceptable. The proposed method is applicable in practice.

    Triaxial analysis of particle flow in geocell reinforced sand samples
    LU Shaoke, XIA Xiaohe, ZHANG Mengxi, YANG Jimang
    2019, 25(1):  132-140.  doi:10.12066/j.issn.1007-2861.1929
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    To analyze the effect of geocell in soil reinforcement, this paper studies high strength geocell. Characteristics of soil reinforced with geocell under different conditions are investigated by indoor triaxial tests using particle flow software. Three dimension particle flow code (PFC$^{3\rm D}$) is used to simulate reinforced stress-strain characteristics of sandy soil under different conditions, the contact force distribution, and distribution regularity of the displacement field. The results show that PFC$^{3\rm D}$ can better simulate characteristics of stress-strain of reinforced sand. With the increase of the welding of geocell, the model of reinforced soil bearing capacity increases. The higher the geocell, the higher the bearing capacity of the reinforced soil. With the increase of confining pressure, bearing capacity of the reinforced sand increases. Displacements of the reinforced sand under load are then analyzed. The results show that the displacement direction of the soil particles in the geocell and its influence area are more concentrated and neater. It is basically along the principal stress direction, spreading outward in the geocell impact area outside the soil particles.

    Pricing problems for warehouse sharing with different targets and risk parameters
    GAI Ling, ZHANG Jingfang
    2019, 25(1):  141-154.  doi:10.12066/j.issn.1007-2861.2062
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    To explore the characteristics of warehouse rental and service pricing in the warehouse sharing market, a dynamic game model of bilateral market has been established. Considering the interaction between warehouse owners and renters, this paper first analyzes the warehouse sharing market from the perspective of supply and demand, then analyzes the characteristics of sharing price and service price under different objectives (owners' revenue maximization/social welfare maximization), respectively. The results show that the sharing price has structural characteristics under different objectives. The healthy development of integrated services in the warehouse sharing market needs to control risks and reduce service costs, and the type of the renters' risk preferences will affect the range of service pricing.

    Investment portfolio model considering cost stickiness
    CAI Yuxin, REN Yongping
    2019, 25(1):  155-163.  doi:10.12066/j.issn.1007-2861.1914
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    The mean variance (MV) model and the mean absolute deviation (MAD) model are early classic portfolio models. Using the modern investment theory, this paper studies these two models by considering cost stickiness. Using the average annual and monthly income rates of the Chinese integrated stock market in the period of 2004---2015 as test samples, and the income rates in 2006---2015 as check samples, an empirical analysis shows that the profit of cost stickiness MV (CSMV) model is better than the MV model, and the profit of cost stickiness MAD (CSMAD) model is also better than the MAD model.

    Directional migration of neural stem cells induced by orderly gradient scaffolds
    LI Mengyuan, LI Xiaoran, DAI Jianwu, WEN Tieqiao
    2019, 25(1):  164-170.  doi:10.12066/j.issn.1007-2861.1894
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    Stromal-cell-derived factor-1$\alpha $ (SDF1$\alpha )$ plays an important role in inducing stem cell migration. Using a modified electrospinning technique, CBD-SDF1$\alpha $ embedded in radial orderly gradient fiber scaffolds to study migration of neural stem cells (NSCs) and neural stem cell spheres (NSCS) was prepared. The following results were obtained. 1) Gradient scaffolds induced migration of NSCs and NSCS along the orderly fiber scaffolds from a low concentration area to a high concentration area of collagen-binding domain SDF1$\alpha $ (CBD-SDF1$\alpha $). 2) The number and diffusion area in NSCs derived from NSCS were increased significantly in a high concentration area than in a low concentration area of CBD-SDF1$\alpha $. 3) NSCS exhibited polarized morphology and extended directionally along aligned gradient fiber scaffolds.