In this paper,the isogeometric analysis(IGA)method is employed to analyze the oscillation characteristics of functionally graded triply periodic minimal surface(FG-TPMS)curved-doubly shells integrated with magneto-ele...In this paper,the isogeometric analysis(IGA)method is employed to analyze the oscillation characteristics of functionally graded triply periodic minimal surface(FG-TPMS)curved-doubly shells integrated with magneto-electric surface layers(referred to as"FG-TPMS-MEE curved-doubly shells")subjected to low-velocity impact loads.This study presents low-velocity impact load model based on a single springmass(S-M)approach.The FG-TPMS-MEE curved-doubly shells are covered with two magneto-electric surface layers,while the core layer consists of three types:I-graph and Wrapped Package-graph(IWP),Gyroid(G),and Primitive(P),with various graded functions.These types are notable for their exceptional stiffness-to-weight ratios,enabling a wide range of potential applications.The Maxwell equations and electromagnetic boundary conditions are applied to compute the change in electric potentials and magnetic potentials.The equilibrium equations of the shell are derived from a refined higher-order shear deformation theory(HSDT),and the transient responses of the FG-TPMS-MEE curveddoubly shells are subsequently determined using Newmark's direct integration method.These results have applications in structural vibration control and the analysis of structures subjected to impact or explosive loads.Furthermore,this study provides a theoretical prediction of the low-velocity impact load and magneto-electric-elastic effects on the free vibration and transient response of FG-TPMS-MEE curved-doubly shells.展开更多
目的探讨不同入路腹腔镜手术对右半结肠癌患者肠屏障功能、红细胞免疫及预后的影响。方法选取2019年4月至2021年4月我院收治的110例右半结肠癌患者,简单随机化法分为A组(n=55)和B组(n=55),治疗期间,A组失访2例,B组失访3例,最终A组和B组...目的探讨不同入路腹腔镜手术对右半结肠癌患者肠屏障功能、红细胞免疫及预后的影响。方法选取2019年4月至2021年4月我院收治的110例右半结肠癌患者,简单随机化法分为A组(n=55)和B组(n=55),治疗期间,A组失访2例,B组失访3例,最终A组和B组分别纳入53例和52例。2组均行腹腔镜手术,A组采取头侧入路,B组采取中间入路。统计2组围手术期指标、并发症、预后及手术前后肠屏障功能(内毒素、D-乳酸、二胺氧化酶)、红细胞免疫[红细胞免疫复合物花环率(RBC-ICR)、红细胞C3b受体花环率(RBC-C3bRR)、红细胞黏附肿瘤细胞花环率(TRR)]。结果与B组相比,A组术中出血量较少,中央淋巴结清扫时间、手术时间较短,并发症发生率较低(P<0.05);术后3 d 2组内毒素、二胺氧化酶、D-乳酸水平均高于术前(P<0.05);术后3 d 2组RBC-ICR高于术前,TRR、RBC-C3bRR低于术前(P<0.05);术后1年随访,2组远处转移、局部复发、生存率比较,差异无统计学意义(P>0.05)。结论2种入路方案在右半结肠癌中效果相当,其中头侧入路腹腔镜手术可缩短手术时间,降低并发症发生率。展开更多
文摘In this paper,the isogeometric analysis(IGA)method is employed to analyze the oscillation characteristics of functionally graded triply periodic minimal surface(FG-TPMS)curved-doubly shells integrated with magneto-electric surface layers(referred to as"FG-TPMS-MEE curved-doubly shells")subjected to low-velocity impact loads.This study presents low-velocity impact load model based on a single springmass(S-M)approach.The FG-TPMS-MEE curved-doubly shells are covered with two magneto-electric surface layers,while the core layer consists of three types:I-graph and Wrapped Package-graph(IWP),Gyroid(G),and Primitive(P),with various graded functions.These types are notable for their exceptional stiffness-to-weight ratios,enabling a wide range of potential applications.The Maxwell equations and electromagnetic boundary conditions are applied to compute the change in electric potentials and magnetic potentials.The equilibrium equations of the shell are derived from a refined higher-order shear deformation theory(HSDT),and the transient responses of the FG-TPMS-MEE curveddoubly shells are subsequently determined using Newmark's direct integration method.These results have applications in structural vibration control and the analysis of structures subjected to impact or explosive loads.Furthermore,this study provides a theoretical prediction of the low-velocity impact load and magneto-electric-elastic effects on the free vibration and transient response of FG-TPMS-MEE curved-doubly shells.
文摘目的探讨不同入路腹腔镜手术对右半结肠癌患者肠屏障功能、红细胞免疫及预后的影响。方法选取2019年4月至2021年4月我院收治的110例右半结肠癌患者,简单随机化法分为A组(n=55)和B组(n=55),治疗期间,A组失访2例,B组失访3例,最终A组和B组分别纳入53例和52例。2组均行腹腔镜手术,A组采取头侧入路,B组采取中间入路。统计2组围手术期指标、并发症、预后及手术前后肠屏障功能(内毒素、D-乳酸、二胺氧化酶)、红细胞免疫[红细胞免疫复合物花环率(RBC-ICR)、红细胞C3b受体花环率(RBC-C3bRR)、红细胞黏附肿瘤细胞花环率(TRR)]。结果与B组相比,A组术中出血量较少,中央淋巴结清扫时间、手术时间较短,并发症发生率较低(P<0.05);术后3 d 2组内毒素、二胺氧化酶、D-乳酸水平均高于术前(P<0.05);术后3 d 2组RBC-ICR高于术前,TRR、RBC-C3bRR低于术前(P<0.05);术后1年随访,2组远处转移、局部复发、生存率比较,差异无统计学意义(P>0.05)。结论2种入路方案在右半结肠癌中效果相当,其中头侧入路腹腔镜手术可缩短手术时间,降低并发症发生率。
