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| 1 | Calibration of the simulation parameters of the particulate materials in film mixed materials显示文摘In order to obtain accurate contact parameters of a particulate material in residual film mixture collected by cotton field machine in Xinjiang,the angle of repose test and inclined plane test were carried out.In the tests,the angles of repose of the particulate material with the water content of(6.26±1.5)%and(14.1±2.1)%were measured respectively,as well as the static sliding friction angle between the particulate material and the residual film.At the same time,the EDEM software was used to calibrate the coefficient of restitution,static friction coefficient and dynamic friction coefficient between the material and the film.Then,the second-order response model between contact parameters and the angle of repose and static sliding friction angle was constructed.In addition,the optimal contact parameters between the granular materials and the mulch were obtained by fitting the physical test data.The results indicated that the errors between the physical test results and the numerical simulation results are small.It was proved that the second-order response model could predict the repose angle of granular materials and the static sliding friction angle between granular materials and farmland film.This study could provide theoretical support for the subsequent model construction of the residual film mixture collected by the cotton field machine. | Rongqing Liang Xuegeng Chen Peng Jiang Bingcheng Zhang Hewei Meng Xiangbin Peng Za Kan | 2020 | International Journal of Agricultural and Biological Engineering2020，13，4： | 3 |
| 2 | Calibration of the simulation parameters of jujubes in dwarfing and closer cultivation in Xinjiang during harvest period显示文摘order to obtain accurate contact parameters of jujubes in dwarfing and closer cultivation in Xinjiang during the harvest period,based on the Hertz-Mindlin(no-slip)contact model in EDEM,the contact parameters,including the coefficient of restitution,static friction,and rolling friction,between jujube and machine components have been calibrated through physical and simulation test.The coefficient of restitution,static friction,and rolling friction between the jujubes and steel(jujube-steel)were calculated as 0.33,0.46,and 0.04,respectively.The coefficient of restitution,static friction,and rolling friction between the jujubes and polyvinyl chloride(PVC)(jujube-PVC)were calculated as 0.39,0.61,and 0.06,respectively.The optimum contact parameters among jujubes(inter-jujubes)were 0.23,0.33,and 0.04.The accumulation test was applied for comparing the simulation and testing values of jujube’s repose angle.In the results,the relative error was 1.27%which means the discrete element model and the contact parameters of jujube can be used for the discrete element simulation test.In addition,the results can be adequately used to simulate particle scale mechanics(grain commingling,flow/motion,forces,etc.)of jujube in harvest as well as the design and working mechanism study of post-harvest processing machinery and devices. | Shiqi Yao Gaokun Shi Baoshuai Wang Huijie Peng Hewei Meng Za Kan | 2022 | International Journal of Agricultural and Biological Engineering2022，15，2： | 0 |
| 3 | Genetic variants in promoter region of TFR2 is associated with the risk of non-alcoholic fatty liver disease in a Chinese Han population:a case–control study显示文摘Background Iron overload is frequently observed in non-alcoholic fatty liver disease(NAFLD).Transferrin receptor 2(TFR2)is an important key factor in iron regulation.We aimed to investigate whether TFR2 single nucleotide polymorphisms(SNPs)contribute to susceptibility to NAFLD in a Chinese Han population.Methods Five tag SNPs(rs10247962,rs4434553,rs2075672,rs1052897,and rs3757859)in the TFR2 gene were selected and genotyped in a case–control study on participants who visited two affiliated hospitals of Fujian Medical University between June 2011 and August 2017.Propensity score matching and inverse probability of treatment weighting analyses were used to verify the risk associated with TFR2 SNPs.Results Logistic regression analyses suggested that subjects with the rs4434553 GA or GG genotype had a lower risk of NAFLD than those carrying the AA genotype(odds ratio=0.630,95%confidence interval=0.504–0.788).Moreover,the rs4434553 GA or GG genotype was negatively correlated with body mass index,hepatic steatosis index,and serum ferritin(b=-0.363,P=0.008;b=-1.040,P=0.009;b=-35.258,P=0.015,respectively),and positively associated with serum hepcidin level(b=35.308,P<0.001).Moreover,rs10247962 and rs1052897 had multiplicative interactions with age in relation to the risk of NAFLD(P for interactions,0.041 and 0.034,respectively).The cumulative effects of the rs10247962,rs1052897,and rs4434553 SNPs were positively associated with the risk of NAFLD(adjusted P_(trend)=0.012).Conclusions In this Chinese Han population,the rs4434553 polymorphism in TFR2 may be an independent influencing factor associated with the susceptibility to NAFLD.The ageing effect on the development of NAFLD may be inhibited by SNPs rs10247962 and rs1052897. | Xinting Pan Hewei Peng Junchao Zhang Yunli Wu Zhijian Hu Xian-E.Peng | 2022 | Gastroenterology Report2022，10，1： | 0 |
| 4 | Association between Hepatitis B virus and gastric cancer:A systematic review and meta-analysis显示文摘An increasing number of studies are suggesting that hepatitis B virus(HBV)infection may be associated with an increased risk of not only hepatocellular carcinoma but also gastric cancer(GC).Whether HBV infection can be a risk factor for GC remains to be explored.In this study,we systematically searched for all eligible literature in 7 databases(China National Knowledge Infrastructure,WanFang,China Science and Technology Journal,PubMed,Cochrane Library,Web of Science and Embase).Eligible studies were required to have a case-control or cohort design.Sixteen studies were included and a meta-analysis was performed using Stata version 17.0.The quality of the included studies was assessed using the Newcastle-Ottawa Scale.The association between HBV infection and risk of GC was quantified by calculating the odds ratio and 95%confidence interval.The proportion of high-quality studies was 87.5%(14/16).The risk of GC was higher when HBV infection was present than when it was not(combined odds ratio 1.29,95%confidence interval 1.16-1.44;I^(2)=62.7%,p<0.001).The results of subgroup analyses were consistent with the main results.In conclusion,this systematic review and meta-analysis identified a positive association between HBV infection and an increased risk of GC. | Rong Yu Jingru Huang Hewei Peng Shuo Yin Weijiang Xie Shutong Ren Xian-E Peng | 2023 | Infectious Medicine2023，2，2： | 0 |
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