A microwave absorbing sheet with a high complex permeability and a relatively low complex permittivity is obtained by molding of the densely coated flaky carbonyl iron particles(FCIPs)by styrenebutadiene-styrene block...A microwave absorbing sheet with a high complex permeability and a relatively low complex permittivity is obtained by molding of the densely coated flaky carbonyl iron particles(FCIPs)by styrenebutadiene-styrene block copolymer(SBS)in the assistance of coupling agent modification.Direct molding of the core-shell FCIPs without adding extra binder results in a large permeability due to the high filling ratio(55vol%)of absorbents.Importantly,the permittivity is well suppressed by the dense insulate polymer shell on the FCIPs,avoiding the severe impedance mismatch problem of the high filler content microwave absorbing materials.Investigations show that modifying the surface of FCIPs by proper amount of silane coupling agent is critical for the coating quality of the SBS shell,which is verified by resistivity and corrosion current density measurements,and can be interpreted by improved interfacial compatibility between the modified FCIPs and SBS.The obtained microwave absorbing sheet shows a minimum reflection loss of-38.74 dB at 1.57 GHz and has an effective absorption bandwidth from 1.1 to 2.3 GHz at a relatively small thickness of 2 mm.展开更多
目的:分析并探讨影响接受外科治疗的胸腺瘤患者预后的临床、病理等因素。方法:回顾性分析南京医科大学第一附属医院胸外科2008年1—6月收治的胸腺瘤患者354例,评估分析年龄、性别、肿瘤直径、世界卫生组织(World Health Organization,W...目的:分析并探讨影响接受外科治疗的胸腺瘤患者预后的临床、病理等因素。方法:回顾性分析南京医科大学第一附属医院胸外科2008年1—6月收治的胸腺瘤患者354例,评估分析年龄、性别、肿瘤直径、世界卫生组织(World Health Organization,WHO)病理分型、TNM分期、Masaoka-Koga分期、重症肌无力、根治性切除对患者预后的影响。结果:Kaplan-Meier单因素生存分析显示:年龄(P=0.002)、肿瘤直径(P=0.045)、WHO病理分型(P=0.051)、TNM分期(P=0.004)、Masaoka-Koga分期(P<0.001)、根治性切除(P<0.001)与患者预后相关。Cox多因素生存分析显示,年龄(P=0.003,危害比:10.151,95%CI:2.239~46.021)、WHO病理分型(P=0.045,危害比:3.376,95%CI:1.030~11.064)、Masaoka-Koga分期(P=0.009,危害比:5.621,95%CI:1.552~20.352)是影响胸腺瘤患者总体生存的独立预后因素。结论:胸腺瘤的早期诊断可以有效提高其外科治疗效果,积极实行根治性切除是改善胸腺瘤患者预后的重要手段,术后准确的病理分析可帮助临床医生预测患者预后。展开更多
基金Funded by the Young Top-notch Talent Cultivation Program of Hubei Provincethe National Natural Science Foundation of China(Nos.52071239,51521001)Fundamental Research Funds for the Central Universities(Nos.WUT:2021IVA116 and WUT:2021CG015)。
文摘A microwave absorbing sheet with a high complex permeability and a relatively low complex permittivity is obtained by molding of the densely coated flaky carbonyl iron particles(FCIPs)by styrenebutadiene-styrene block copolymer(SBS)in the assistance of coupling agent modification.Direct molding of the core-shell FCIPs without adding extra binder results in a large permeability due to the high filling ratio(55vol%)of absorbents.Importantly,the permittivity is well suppressed by the dense insulate polymer shell on the FCIPs,avoiding the severe impedance mismatch problem of the high filler content microwave absorbing materials.Investigations show that modifying the surface of FCIPs by proper amount of silane coupling agent is critical for the coating quality of the SBS shell,which is verified by resistivity and corrosion current density measurements,and can be interpreted by improved interfacial compatibility between the modified FCIPs and SBS.The obtained microwave absorbing sheet shows a minimum reflection loss of-38.74 dB at 1.57 GHz and has an effective absorption bandwidth from 1.1 to 2.3 GHz at a relatively small thickness of 2 mm.
文摘目的:分析并探讨影响接受外科治疗的胸腺瘤患者预后的临床、病理等因素。方法:回顾性分析南京医科大学第一附属医院胸外科2008年1—6月收治的胸腺瘤患者354例,评估分析年龄、性别、肿瘤直径、世界卫生组织(World Health Organization,WHO)病理分型、TNM分期、Masaoka-Koga分期、重症肌无力、根治性切除对患者预后的影响。结果:Kaplan-Meier单因素生存分析显示:年龄(P=0.002)、肿瘤直径(P=0.045)、WHO病理分型(P=0.051)、TNM分期(P=0.004)、Masaoka-Koga分期(P<0.001)、根治性切除(P<0.001)与患者预后相关。Cox多因素生存分析显示,年龄(P=0.003,危害比:10.151,95%CI:2.239~46.021)、WHO病理分型(P=0.045,危害比:3.376,95%CI:1.030~11.064)、Masaoka-Koga分期(P=0.009,危害比:5.621,95%CI:1.552~20.352)是影响胸腺瘤患者总体生存的独立预后因素。结论:胸腺瘤的早期诊断可以有效提高其外科治疗效果,积极实行根治性切除是改善胸腺瘤患者预后的重要手段,术后准确的病理分析可帮助临床医生预测患者预后。
