目的总结分析腹腔镜保留十二指肠胰头切除术(laparoscopic duodenum-preserving pancreatic head resection,LDPPHR)的相关经验。方法回顾性分析福建省立医院肝胆胰外科自2017年7月至2020年1月施行的9例LDPPHR患者的临床资料。结果8例...目的总结分析腹腔镜保留十二指肠胰头切除术(laparoscopic duodenum-preserving pancreatic head resection,LDPPHR)的相关经验。方法回顾性分析福建省立医院肝胆胰外科自2017年7月至2020年1月施行的9例LDPPHR患者的临床资料。结果8例患者顺利完成手术,1例中转。手术时间255~473min,术中出血50~800ml。术后2例患者无并发症;2例B级胰瘘;1例胆瘘伴远端胆管狭窄;1例B级胰瘘、胆瘘、少量腹腔出血伴远端胆管狭窄;1例B级胰瘘伴胰背动脉出血;1例慢性腹泻;1例继发性糖尿病。术后住院时间11~39d。术后病理诊断为胰腺炎合并胰管结石2例,胰腺实性-假乳头状瘤3例,胰腺导管内乳头状黏液性肿瘤2例,胰腺浆液性囊性肿瘤1例,胰腺黏液性囊性肿瘤1例。结论LDPPHR适用于胰头肿块型慢性胰腺炎、胰头良性及交界性肿瘤的治疗,具有创伤小、术后恢复快等优势,适宜在较大的胰腺外科中心推广,但仍需关注围术期并发症的防治。展开更多
Nanoplates have been widely used as elementary components for ultrasensitive and ultrafine resolution applications in the field of nano-electro-mechanical systems because of their potentially remarkable mechanical pro...Nanoplates have been widely used as elementary components for ultrasensitive and ultrafine resolution applications in the field of nano-electro-mechanical systems because of their potentially remarkable mechanical properties.The accurate analysis of their mechanical behavior is currently of particular interest in the function design and reliability analysis of nano-scaled devices.To examine the size-dependent bending and vibration behavior of nanoplates with curvilinear and irregular shapes,a new p-version curved C^(1)finite element is formulated in the framework of the nonlocal Kirchhoff plate model.This newly developed element not only enables an accurate geometry representation and easy mesh generation of curvilinear domains but also overcomes the difficulty of imposing C^(1)conformity required by the nonlocal Kirchhoff plate model,particularly on the curvilinear inter-element boundaries.Numerical examples show that this element can produce an exponential rate of convergence even when curved elements are used in the domain discretization.Vast numerical results are presented for nanoplates with various geometric shapes,including rectangular,circular,elliptic,annular,and sectorial.The high accuracy of the present element is verified by comparing the obtained results with analytical and numerical results in the literature.Additionally,a comprehensive parametric analysis is conducted to investigate the influences of nonlocal parameters,plate dimensions,and boundary conditions on the nonlocal behavior of nanoplates.The present element can be envisaged to allow large-scale mechanical simulations of nanoplates,with a guarantee of accuracy and efficiency.展开更多
To balance the contradiction between comprehensiveness of system-of systems （SOS） description and cost of modeling and simulation, a non-uniform hybrid strategy （NUHYS） is pro- posed. NUHYS groups elements of an S...To balance the contradiction between comprehensiveness of system-of systems （SOS） description and cost of modeling and simulation, a non-uniform hybrid strategy （NUHYS） is pro- posed. NUHYS groups elements of an SoS operation into system community or relatively indepen- dent system based on contributors complexity and focus relationship according to the focus of SoS problem. Meanwhile, modeling methods are categorized based on details attention rate and dynamic attention rate, seeking for matching contributors. Taking helicopter rescue in earthquake relief as an example, the procedure of applying NUHYS and its effectiveness are verified.展开更多
文摘目的总结分析腹腔镜保留十二指肠胰头切除术(laparoscopic duodenum-preserving pancreatic head resection,LDPPHR)的相关经验。方法回顾性分析福建省立医院肝胆胰外科自2017年7月至2020年1月施行的9例LDPPHR患者的临床资料。结果8例患者顺利完成手术,1例中转。手术时间255~473min,术中出血50~800ml。术后2例患者无并发症;2例B级胰瘘;1例胆瘘伴远端胆管狭窄;1例B级胰瘘、胆瘘、少量腹腔出血伴远端胆管狭窄;1例B级胰瘘伴胰背动脉出血;1例慢性腹泻;1例继发性糖尿病。术后住院时间11~39d。术后病理诊断为胰腺炎合并胰管结石2例,胰腺实性-假乳头状瘤3例,胰腺导管内乳头状黏液性肿瘤2例,胰腺浆液性囊性肿瘤1例,胰腺黏液性囊性肿瘤1例。结论LDPPHR适用于胰头肿块型慢性胰腺炎、胰头良性及交界性肿瘤的治疗,具有创伤小、术后恢复快等优势,适宜在较大的胰腺外科中心推广,但仍需关注围术期并发症的防治。
基金the National Major Science and Technology Projects of China(Grant No.J2019-VI-0001-0114)the National Natural Science Foundation of China(Grant Nos.11972004,11772031,11402015)。
文摘Nanoplates have been widely used as elementary components for ultrasensitive and ultrafine resolution applications in the field of nano-electro-mechanical systems because of their potentially remarkable mechanical properties.The accurate analysis of their mechanical behavior is currently of particular interest in the function design and reliability analysis of nano-scaled devices.To examine the size-dependent bending and vibration behavior of nanoplates with curvilinear and irregular shapes,a new p-version curved C^(1)finite element is formulated in the framework of the nonlocal Kirchhoff plate model.This newly developed element not only enables an accurate geometry representation and easy mesh generation of curvilinear domains but also overcomes the difficulty of imposing C^(1)conformity required by the nonlocal Kirchhoff plate model,particularly on the curvilinear inter-element boundaries.Numerical examples show that this element can produce an exponential rate of convergence even when curved elements are used in the domain discretization.Vast numerical results are presented for nanoplates with various geometric shapes,including rectangular,circular,elliptic,annular,and sectorial.The high accuracy of the present element is verified by comparing the obtained results with analytical and numerical results in the literature.Additionally,a comprehensive parametric analysis is conducted to investigate the influences of nonlocal parameters,plate dimensions,and boundary conditions on the nonlocal behavior of nanoplates.The present element can be envisaged to allow large-scale mechanical simulations of nanoplates,with a guarantee of accuracy and efficiency.
基金supported by the Research Project of Ministry of Industry and Information Technology of the People’s Republic of China
文摘To balance the contradiction between comprehensiveness of system-of systems （SOS） description and cost of modeling and simulation, a non-uniform hybrid strategy （NUHYS） is pro- posed. NUHYS groups elements of an SoS operation into system community or relatively indepen- dent system based on contributors complexity and focus relationship according to the focus of SoS problem. Meanwhile, modeling methods are categorized based on details attention rate and dynamic attention rate, seeking for matching contributors. Taking helicopter rescue in earthquake relief as an example, the procedure of applying NUHYS and its effectiveness are verified.
