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| 1 | Experimental and theoretical study on the dynamic effective stress of loaded gassy coal during gas release显示文摘In the process of mining coalbed methane(CBM),an unsteady state often arises due to the rapid extraction,release and pressure relief of CBM.In this case,the effective stress of coal changes dynamically,affecting the stability of the gassy coal seam.In this paper,gas release tests of gassy coal under conventional triaxial compression were performed,and the dynamic effective stress(DES)during gas release was obtained indirectly based on a constitutive equation and deformation of coal.The results show that the maximum increases in DES caused by the release of free gas and adsorbed gas under the stress of 1.1 MPa were 0.811 and 5.418 MPa,respectively,which seriously affected the stress state of the coal.During the gas release,the free gas pressure and the adsorbed gas volume were the parameters that directly affected the DES and showed a positive linear relationship with the DES with an intercept of zero.The DES of the coal sample increased exponentially with time,which was determined by the contents of free and adsorbed gas.Based on the experimental results and theoretical analysis,an effective stress model was obtained for loaded gassy coal during gas release.The results of verification indicated accuracy greater than 99%. | Bing Zhang Hanpeng Wang Peng Wang Guofeng Yu Shitan Gu | 2023 | International Journal of Mining Science and Technology2023，33，3： | 2 |
| 2 | Correlation of obstructive sleep apnea hypopnea syndrome with metabolic syndrome in snorers显示文摘Though obstructive sleep apnea hypopnea syndrome(OSAHS) and metabolic syndrome(MS) are correlated;the contributing factors for the occurrence of MS in Chinese snorers remain largely undefined.We aimed to investigate the associated pathogenesis of coexistence of OSAHS and MS in Chinese snorers.A total of 144 Chinese habitual snorers were divided into 3 groups,the control group(simple snorers)(n = 36),the mild OSAHS group(n= 52)and the moderate-to-severe OSAHS group(n = 56).The incidence of MS in the moderate-to-severe OSAHS group(26.8%) was significantly higher than that in the control group(8.3%),the mild OSAHS group(11.1%) and all the OSAHS patients(19.45%)(all P < 0.05).Homeostatic model assessment(HOMA) index and proinsulin(PI) were negatively correlated with nocturnal meanSpO_2 and miniSpO_2.Meanwhile,nocturnal SpO_2 were negatively correlated with body mass index,waist and neck circumferences and diastolic blood pressure,but positively correlated with total cholesterol and high-density lipoprotein cholesterol.The study indicated that in Chinese snorers,moderate-to-severe OSAHS was closely associated with MS via nocturnal hypoxemia. | Qun Zhang Xiaofeng Zhang Mengmeng Zhao Hanpeng Huang Ning Ding Xilong Zhang Hong Wang | 2014 | The Journal of Biomedical Research2014，28，3： | 2 |
| 3 | Production and characterization of acidophilic xylanolytic enzymes from Penicillium oxalicum GZ-2显示文摘 | Hanpeng Liao Chunmiao Xu Shiyong Tan Zhong Wei Ning Ling Guanghui Yu Waseem Raza Ruifu Zhang Qirong Shen Yangchun Xu | 2012 | Bioresource Technology2012，，： | 1 |
| 4 | A appraisement on perceived risk in e-commerce显示文摘Economic risk,financial risk and psychological risk are all perceived risk dimensions in an electronic shopping environment. While the perceived risk can be studied from the perspective of an individual decision-making process,the factors affecting consumer decision making,such as individual attitudes,experiences,external influences are important parts of designing risk management mechanism in online shopping environment. These mechanisms,such as reputation,ocr,third-party guarantees,etc.,control and reduce consumer perceived risks from different angles. | Hanpeng Zhang Ruofan Sun | 2010 | 人力资源管理:学术版2010，，2： | 0 |
| 5 | Clinical significance of serum IgM and IgG levels in COVID-19 patients in Hubei Province,China显示文摘Background:There have been many studies about coronavirus disease 2019(COVID-19),but the clinical signifi-cance of quantitative serum severe acute respiratory syndrome-coronavirus-2(SARS-CoV-2)-specific IgM and IgG levels of COVID-19 patients have not been exhaustively analyzed.We aimed to investigate the time profiles of these IgM/IgG levels in COVID-19 patients and their correlations with clinical features.Methods:A multicenter clinical study was conducted from February 20 to March 52020.It involved 179 COVID-19 patients(108 males and 71 females)from five hospitals in Huangshi in Hubei Province,China.To detect SARS-CoV-2-specific IgM/IgG,quantitative antibody assays(two-step indirect immunoassays with direct chemilu-minescence technology)based on the nucleocapsid protein(NP)and spike protein 1(S1)were used.For normally distributed data,means were compared using the t-test,��2-test,or exact probability method.For categorical data,medians were compared using Mann-Whitney U test.Results:The median age was 57(44-69)years(58[38-69]for males and 57[49-68]for females).The median duration of positive nucleic acid test was 22.32(17.34-27.43)days.The mortality rate was relatively low(3/179,1.68%).Serum SARS-CoV-2-specific IgG was detected around week 1 after illness onset,gradually increased until peaking in weeks 4 and 5,and then declined.Serum IgM peaked in weeks 2 and 3,then gradually declined and returned to its normal range by week 7 in all patients.Notably,children had milder respiratory symptoms with lower SARS-CoV-2-specific IgM/IgG levels.The duration of positive nucleic acid test in the chronic obstructive pulmonary disease(COPD)group was 30.36(18.99-34.76)days,which was significantly longer than that in the non-COPD group(21.52[16.75-26.51]days;P=0.025).The peak serum SARS-CoV-2-specific IgG was sig-nificantly positively correlated with the duration of positive nucleic acid test.The incidence rate of severe and critical cases in the IgM hi group(using the median IgM level of 29.95 AU/mL as the cutofffor grouping)was about 38.0%(19/50),which was twice as much as that in the IgM lo group(18.4%;9/49).The patients with positive chest imaging and lymphocytopenia(<1×10^(9)/L)had a higher SARS-CoV-2-specific IgM level.Conclusions: Quantitative SARS-CoV-2-specific IgM and IgG levels are helpful for the diagnosis, severity classifi- cation, and management of COVID-19 patients, and they should be monitored in each stage of this disease. | Zhenjiang Bai Qing Li Qinghui Chen Changming Niu Yu Wei Hanpeng Huang Wei Zhao Nian Chen Xin Yao Qiang Zhang Chuanyong Mu Jian Feng Chuanlong Zhu Zhuo Li Ming Ding Binhui Feng Chaochao Jin Xiang Lu Yi Yang Shuiyan Wu Xiaochen Shu Haibo Qiu YingZi Huang | 2022 | Journal of Intensive Medicine2022，2，1： | 0 |
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