Internal solitary waves(ISWs)change the roughness of the sea surface,thus producing dark and bright bands in optical images.However,reasons for changes in imaging characteristics with the solar zenith angle remain unc...Internal solitary waves(ISWs)change the roughness of the sea surface,thus producing dark and bright bands in optical images.However,reasons for changes in imaging characteristics with the solar zenith angle remain unclear.In this paper,the optical imaging pattern of ISWs in sunglint under different zenith angles of the light source is investigated by collecting optical images of ISWs through physical simulation.The experiment involves setting 10 zenith angles of the light source,which are divided into area a the optical images of ISWs in the three areas show dark-bright mode,single bright band,and bright-dark mode,which are consistent with those observed by optical remote sensing.In addition,this study analyzed the percentage of the dark and bright areas of the bands and the change in the relative gray difference and found changes in both areas under different zenith angles of the light source.The MODIS and ASAR images display a similar brightness-darkness distance of the same ISWs.Therefore,the relationship between the brightness-darkness distance and the characteristic half-width of ISWs is determined in accordance with the eKdV theory and the imaging mechanism of ISWs of the SAR image.Overall,the relationship between them in the experiment is almost consistent with the theoretical result.展开更多
目的探究全身免疫炎症指标,包括全身免疫炎症指数(systemic immune-inflammation index,SII)、中性粒细胞-淋巴细胞比值(neutrophil to lymphocyte ratio,NLR)、血小板-淋巴细胞比值(platelet to lymphocyte ratio,PLR)及单核细胞-淋巴...目的探究全身免疫炎症指标,包括全身免疫炎症指数(systemic immune-inflammation index,SII)、中性粒细胞-淋巴细胞比值(neutrophil to lymphocyte ratio,NLR)、血小板-淋巴细胞比值(platelet to lymphocyte ratio,PLR)及单核细胞-淋巴细胞比值(monocyte-lymphocyte ratio,MLR)对原发性胆汁性胆管炎(primary biliary cholangitis,PBC)患者肝癌发生的预测价值。方法回顾性分析了从2010年至2021年北京佑安医院835例来院诊疗的PBC患者,并且收集了他们初次来我院被诊断为PBC时的人口统计学相关信息和实验室检查结果。首先,比较了最终发生肝癌组和未发生肝癌组间基线水平的血常规、肝生化及免疫相关抗体指标的差异性,随后利用Cox回归模型筛选出了PBC相关肝癌的危险因素,最后根据ROC曲线下面积(AUC)比较不同指标对PBC相关肝癌发生的预测价值。结果年龄、存在肝硬化是PBC相关肝癌的危险因素。此外,对于预测肝癌发生的全身免疫炎症指标,我们的结果表明MLR较其他指标可以更好地预测PBC患者肝癌的发生。结论在PBC患者中,将MLR添加到目前的计算指标中,用于PBC发生肝癌的高危患者的早期预警,增加该部分患者的常规检测频率,可能有助于及时监测到患者的肝癌发生,以提供早期且更合适的治疗选择。展开更多
基金National Natural Science Foundation of China (Nos.61871353 and 42006164)for their support。
文摘Internal solitary waves(ISWs)change the roughness of the sea surface,thus producing dark and bright bands in optical images.However,reasons for changes in imaging characteristics with the solar zenith angle remain unclear.In this paper,the optical imaging pattern of ISWs in sunglint under different zenith angles of the light source is investigated by collecting optical images of ISWs through physical simulation.The experiment involves setting 10 zenith angles of the light source,which are divided into area a the optical images of ISWs in the three areas show dark-bright mode,single bright band,and bright-dark mode,which are consistent with those observed by optical remote sensing.In addition,this study analyzed the percentage of the dark and bright areas of the bands and the change in the relative gray difference and found changes in both areas under different zenith angles of the light source.The MODIS and ASAR images display a similar brightness-darkness distance of the same ISWs.Therefore,the relationship between the brightness-darkness distance and the characteristic half-width of ISWs is determined in accordance with the eKdV theory and the imaging mechanism of ISWs of the SAR image.Overall,the relationship between them in the experiment is almost consistent with the theoretical result.
