探讨T2mapping技术在术前预测宫颈癌淋巴血管间隙浸润(lymphovascular space invasion LVSI)的价值。方法 收集2022年1月至2023年6月在珠海市中西医结合医院行子宫切除术的26例宫颈癌患者,所有患者均在术前1周行T2mapping扫描。测量所...探讨T2mapping技术在术前预测宫颈癌淋巴血管间隙浸润(lymphovascular space invasion LVSI)的价值。方法 收集2022年1月至2023年6月在珠海市中西医结合医院行子宫切除术的26例宫颈癌患者,所有患者均在术前1周行T2mapping扫描。测量所有患者肿瘤和正常子宫肌层的T2值,将测量参数进行组内相关系数一致性检验。根据术后病理结果将肿瘤分为LVSI阳性组、LVSI阴性组,鳞癌组、腺癌组,并分析鳞癌与腺癌,LVSI阳性组及LVSI阴性组之间的差异。运用受试者工作特征(receiver operating characteristic,ROC)曲线,分析T2 mapping在诊断LVSI中的价值。结果 宫颈癌与正常子宫肌层之间T2值有统计学意义(P<0.05),鳞癌与腺癌之间T2值无统计学意义(P>0.05),LVSI阳性组T2值低于LVSI阴性组(P<0.05。T2 Mapping评估宫颈癌LVSI的曲线下面积(area under the area under the curve,AUC)为0.735,阈值为,诊断敏感度(sensitivity,Sen) 77.8%,特异度(specificity,Spe) 76.5%,准确度,约登指数0.54。结论 LVSI是宫颈癌重要的预后因素,T2值在术前预测淋巴血管间隙浸润为术前病情评估,指导手术治疗方案具有一定的指导作用。展开更多
By spraying concrete on inner surface,air-supported fabric structures can be used as formwork to construct reinforced concrete shell structures.The fabric formwork has the finished form of concrete structure.Large dev...By spraying concrete on inner surface,air-supported fabric structures can be used as formwork to construct reinforced concrete shell structures.The fabric formwork has the finished form of concrete structure.Large deviation from the desired shape of concrete shells still remains as central problem due to dead weight of concrete and less stiffness of fabric formwork.Polyurethane can be used not only as a bonding layer between fabrics and concrete but also as an additional stiffening layer.However,there is little research on mechanical behaviors of the polyurethane shell structure.This paper presents experimental studies on an inflated fabric model with and without polyurethane,including relief pressure tests,vertical loading tests and horizontal loading tests.Experimental results show that the additional polyurethane layer can significantly enhance the stiffness of the fabric formwork.Compared with the experiment,a numerical model using shell layered finite elements has a good prediction.The reinforcement by polyurethane to improve stiffness of air-supported fabric formwork is expected to be considered in the design and construction of the concrete shell,especially dealing with the advance of shape-control.展开更多
The static performance of inflatable structures has been well studied and the dynamic deployment simulation has received much attention. However, very few studies focus on its deflation behavior. Although there are se...The static performance of inflatable structures has been well studied and the dynamic deployment simulation has received much attention. However, very few studies focus on its deflation behavior. Although there are several dynamic finite element algorithms that can be applied to the deflation simulation, their computation costs are expensive, especially for large scale structures. In this work, a simple method based on classic thermodynamics and the analytical relationship between air and membrane was proposed to efficiently analyze the air state variables under the condition of ventilation. Combined with failure analysis of static bearing capacity, a fast incremental analytical method was presented to predict both elastic and post wrinkling deflation process of inflatable structures. Comparisons between simplified analysis, dynamic finite element simulation, and a full-scale experimental test are presented and the suitability of this simple method for solving the air state and predicting the deflation behavior of inflatable structures is proved.展开更多
文摘探讨T2mapping技术在术前预测宫颈癌淋巴血管间隙浸润(lymphovascular space invasion LVSI)的价值。方法 收集2022年1月至2023年6月在珠海市中西医结合医院行子宫切除术的26例宫颈癌患者,所有患者均在术前1周行T2mapping扫描。测量所有患者肿瘤和正常子宫肌层的T2值,将测量参数进行组内相关系数一致性检验。根据术后病理结果将肿瘤分为LVSI阳性组、LVSI阴性组,鳞癌组、腺癌组,并分析鳞癌与腺癌,LVSI阳性组及LVSI阴性组之间的差异。运用受试者工作特征(receiver operating characteristic,ROC)曲线,分析T2 mapping在诊断LVSI中的价值。结果 宫颈癌与正常子宫肌层之间T2值有统计学意义(P<0.05),鳞癌与腺癌之间T2值无统计学意义(P>0.05),LVSI阳性组T2值低于LVSI阴性组(P<0.05。T2 Mapping评估宫颈癌LVSI的曲线下面积(area under the area under the curve,AUC)为0.735,阈值为,诊断敏感度(sensitivity,Sen) 77.8%,特异度(specificity,Spe) 76.5%,准确度,约登指数0.54。结论 LVSI是宫颈癌重要的预后因素,T2值在术前预测淋巴血管间隙浸润为术前病情评估,指导手术治疗方案具有一定的指导作用。
基金Projects(51178263,51378307)supported by the National Natural Science Foundation of China
文摘By spraying concrete on inner surface,air-supported fabric structures can be used as formwork to construct reinforced concrete shell structures.The fabric formwork has the finished form of concrete structure.Large deviation from the desired shape of concrete shells still remains as central problem due to dead weight of concrete and less stiffness of fabric formwork.Polyurethane can be used not only as a bonding layer between fabrics and concrete but also as an additional stiffening layer.However,there is little research on mechanical behaviors of the polyurethane shell structure.This paper presents experimental studies on an inflated fabric model with and without polyurethane,including relief pressure tests,vertical loading tests and horizontal loading tests.Experimental results show that the additional polyurethane layer can significantly enhance the stiffness of the fabric formwork.Compared with the experiment,a numerical model using shell layered finite elements has a good prediction.The reinforcement by polyurethane to improve stiffness of air-supported fabric formwork is expected to be considered in the design and construction of the concrete shell,especially dealing with the advance of shape-control.
基金Projects(51178263,51378307)supported by the National Natural Science Foundation of China
文摘The static performance of inflatable structures has been well studied and the dynamic deployment simulation has received much attention. However, very few studies focus on its deflation behavior. Although there are several dynamic finite element algorithms that can be applied to the deflation simulation, their computation costs are expensive, especially for large scale structures. In this work, a simple method based on classic thermodynamics and the analytical relationship between air and membrane was proposed to efficiently analyze the air state variables under the condition of ventilation. Combined with failure analysis of static bearing capacity, a fast incremental analytical method was presented to predict both elastic and post wrinkling deflation process of inflatable structures. Comparisons between simplified analysis, dynamic finite element simulation, and a full-scale experimental test are presented and the suitability of this simple method for solving the air state and predicting the deflation behavior of inflatable structures is proved.
