To investigate the impact of limestone powder on the chloride ion concentration coefficient of cement pastes,various techniques such as scanning electron microscopy(SEM),X-ray diffraction(XRD),thermogravimetric analys...To investigate the impact of limestone powder on the chloride ion concentration coefficient of cement pastes,various techniques such as scanning electron microscopy(SEM),X-ray diffraction(XRD),thermogravimetric analysis(TGA),and mercury-porosimetry(MIP)were employed in this paper.The findings demonstrate that the creation of Friedel's salt is inversely associated with the addition of limestone powder,that is,Friedel's salt production is lessened by adding more limestone powder,however,the coefficient of chloride ion concentration initially decreased and then increased again,as does the porosity,and most likely the pore size as well.The specific surface area of limestone powder has increased,and the content of Friedel’s salt increased first and then decreased.However,the shifting trend of Friedel's salt and chloride ion concentration coefficient is in direct opposition,and the pore structure was therefore significantly enhanced.The results of this study offer robust theoretical backing for the inclusion of limestone powder in concrete and provide a positive assessment of its potential applications.展开更多
目的探讨阴性淋巴结数目(NLNC)对胃印戒细胞癌(GSRC)患者预后的影响及构建G S R C患者的预后预测模型。方法基于SEER数据库收集GSRC患者2101例,随机分为建模组和验证组,检验临床病理特征与GSRC预后的关系。多因素Cox比例风险回归模型分...目的探讨阴性淋巴结数目(NLNC)对胃印戒细胞癌(GSRC)患者预后的影响及构建G S R C患者的预后预测模型。方法基于SEER数据库收集GSRC患者2101例,随机分为建模组和验证组,检验临床病理特征与GSRC预后的关系。多因素Cox比例风险回归模型分析影响总生存的独立危险因素并建立预后预测模型。一致性指数(C-index)、校准曲线、净分类指数(NRI)、综合判别指数(IDI)和临床决策曲线(DCA)对列线图进行准确性和临床适用性评估。结果所有患者按照7:3比例划分,建模组1473例,验证组628例。NLNC>10是GSRC患者预后的保护因素(HR=0.578,95%CI:0.504~0.662),根据多因素Cox比例风险回归模型筛选的变量建立Nomogram图,建模组和验证组的C-index分别为0.737(95%CI:0.720~0.753)和0.724(95%CI:0.699~0.749),区分度良好,校准曲线显示模型的一致性较高。NRI=17.77%,连续NRI=36.34%,IDI=4.2%,表明该模型较传统模型是正向收益,DCA决策曲线远离基准线表明模型临床适用性好。结论NLNC增加是GSRC患者预后的有利因素。本研究建立的列线图相对准确,可预测GSRC患者的预后。展开更多
目的探讨经会阴盆底超声定量评估女性后盆腔脱垂的可行性。方法纳入2017年1月至2019年1月在研究分中心单位就诊的485例女性患者,对其进行问诊、行盆腔器官脱垂量化(pelvic organ prolapse quantification,POP-Q)分期及盆底超声检查,采...目的探讨经会阴盆底超声定量评估女性后盆腔脱垂的可行性。方法纳入2017年1月至2019年1月在研究分中心单位就诊的485例女性患者,对其进行问诊、行盆腔器官脱垂量化(pelvic organ prolapse quantification,POP-Q)分期及盆底超声检查,采集静息状态及最大Valsalva状态的盆底超声容积数据。结果患者后盆腔脱垂POP-Q分期越高,最大Valsalva状态直肠壶腹部位置越低(POP-Q分期=0对POP-Q分期=1,P<0.001;POP-Q分期=1对POP-Q分期≥2,P<0.001),直肠壶腹部移动度越大(POP-Q分期=0对POP-Q分期=1,P<0.001;POP-Q分期=1对POP-Q分期≥2,P=0.007)。静息状态及最大Valsalva状态下直肠壶腹部位置和直肠膨出高度与脱垂症状存在相关性(r=-0.200,P<0.001;r=-0.252,P<0.001;r=0.086,P=0.045)。最大Valsalva状态下直肠壶腹部位置诊断后盆腔脱垂(POP-Q分期≥1)和中重度后盆腔脱垂(POP-Q分期≥2)的ROC曲线下面积分别为0.75和0.85,相应的最佳截断值分别为线下7.32 mm和线下12 mm。结论经会阴盆底超声检查测量指标与后盆腔脱垂POP-Q分期具有较好的相关性,能够定量评估女性后盆腔脱垂的严重程度。展开更多
基金Funded by the National Natural Science Foundation of China(No.52008304)the Natural Science Foundation of Fujian Province(No.2023J05021)the Startup Foundation of Scientific Research by Fuzhou University(Nos.XRC-18016 and GXRC21060)。
文摘To investigate the impact of limestone powder on the chloride ion concentration coefficient of cement pastes,various techniques such as scanning electron microscopy(SEM),X-ray diffraction(XRD),thermogravimetric analysis(TGA),and mercury-porosimetry(MIP)were employed in this paper.The findings demonstrate that the creation of Friedel's salt is inversely associated with the addition of limestone powder,that is,Friedel's salt production is lessened by adding more limestone powder,however,the coefficient of chloride ion concentration initially decreased and then increased again,as does the porosity,and most likely the pore size as well.The specific surface area of limestone powder has increased,and the content of Friedel’s salt increased first and then decreased.However,the shifting trend of Friedel's salt and chloride ion concentration coefficient is in direct opposition,and the pore structure was therefore significantly enhanced.The results of this study offer robust theoretical backing for the inclusion of limestone powder in concrete and provide a positive assessment of its potential applications.
文摘目的探讨阴性淋巴结数目(NLNC)对胃印戒细胞癌(GSRC)患者预后的影响及构建G S R C患者的预后预测模型。方法基于SEER数据库收集GSRC患者2101例,随机分为建模组和验证组,检验临床病理特征与GSRC预后的关系。多因素Cox比例风险回归模型分析影响总生存的独立危险因素并建立预后预测模型。一致性指数(C-index)、校准曲线、净分类指数(NRI)、综合判别指数(IDI)和临床决策曲线(DCA)对列线图进行准确性和临床适用性评估。结果所有患者按照7:3比例划分,建模组1473例,验证组628例。NLNC>10是GSRC患者预后的保护因素(HR=0.578,95%CI:0.504~0.662),根据多因素Cox比例风险回归模型筛选的变量建立Nomogram图,建模组和验证组的C-index分别为0.737(95%CI:0.720~0.753)和0.724(95%CI:0.699~0.749),区分度良好,校准曲线显示模型的一致性较高。NRI=17.77%,连续NRI=36.34%,IDI=4.2%,表明该模型较传统模型是正向收益,DCA决策曲线远离基准线表明模型临床适用性好。结论NLNC增加是GSRC患者预后的有利因素。本研究建立的列线图相对准确,可预测GSRC患者的预后。
