Today, most construction projects in urban environments are complex high-rise buildings that present unique challenges, including local building ordinances and restrictions, adjoining public and residential areas, nar...Today, most construction projects in urban environments are complex high-rise buildings that present unique challenges, including local building ordinances and restrictions, adjoining public and residential areas, narrow sidewalks and streets, and underground utilities, all of which require extensive planning and tight schedules. A major problem facing such projects is to formulate realistic schedules that will make it possible to meet contractual completion dates with limited resources and budgets. The scheduling software products currently used in construction projects, which include Primavera P6, Microsoft Project, etc., are not actually applied as a scheduling tool in practical construction projects, which instead generally depend on Microsoft Excel or a bar-chart. This is because the existing scheduling programs cannot provide more user-oriented schedule format such as representing two-way multiple overlapping relationships. To overcome this deficiency, the BDM （beeline diagramming method） is proposed as a new networking technique in 2010. But two-way multiple overlapping relationships generate the loop in a conventional schedule computation process. This paper addresses the loop phenomenon of two-way multiple overlapping relationships in a BDM network as well as proposes the solutions of them, and then presents a practical application of two-way multiple overlapping relationships at a real project.展开更多
Taking advantage of the information sharing mechanism in smart substations,a distributed protection based on multiple overlapping units is introduced in this paper.The area division and the construction of protection ...Taking advantage of the information sharing mechanism in smart substations,a distributed protection based on multiple overlapping units is introduced in this paper.The area division and the construction of protection units are studied based on the principle of differential protection.Mutual perception and information interaction among units,calculation with multisource information and coordinated protection schemes are proposed to improve the reliability and adaptability of the substation protection system.A multi agent system(MAS)approach is used to model the units’working process in various situations,such as communication failure and sampled data failure.Test results demonstrate that the method can accelerate the backup protection as well as reduce the power-off range.展开更多
Arterial stenosis is a critical condition with increasing prevalence among pediatric patients and young adults,making its investigation highly significant.Despite extensive studies on blood flow dynamics,limited resea...Arterial stenosis is a critical condition with increasing prevalence among pediatric patients and young adults,making its investigation highly significant.Despite extensive studies on blood flow dynamics,limited research addresses the combined effects of nanoparticles and arterial curvature on unsteady pulsatile flow through multiple stenoses.This study aims to analyze the influence of nanoparticles on blood flow characteristics in realistic curved arteries with mild to severe overlapped constrictions.Using curvilinear coordinates,the thermal energy and momentum equations for nanoparticle-laden blood were derived,and numerical results were obtained through an explicit finite difference method.Key findings reveal that nanoparticle injections reduce blood temperature intensity,while arterial curvature strongly affects flow symmetry.Moreover,temperature,axial velocity,wall shear stress,and volumetric flow rate decrease significantly in severe stenosis compared to mild and moderate cases.These results provide new insights into nanoparticle-assisted blood flow under complex stenotic conditions and may contribute to improved diagnostic and therapeutic strategies for cardiovascular diseases.展开更多
文摘Today, most construction projects in urban environments are complex high-rise buildings that present unique challenges, including local building ordinances and restrictions, adjoining public and residential areas, narrow sidewalks and streets, and underground utilities, all of which require extensive planning and tight schedules. A major problem facing such projects is to formulate realistic schedules that will make it possible to meet contractual completion dates with limited resources and budgets. The scheduling software products currently used in construction projects, which include Primavera P6, Microsoft Project, etc., are not actually applied as a scheduling tool in practical construction projects, which instead generally depend on Microsoft Excel or a bar-chart. This is because the existing scheduling programs cannot provide more user-oriented schedule format such as representing two-way multiple overlapping relationships. To overcome this deficiency, the BDM （beeline diagramming method） is proposed as a new networking technique in 2010. But two-way multiple overlapping relationships generate the loop in a conventional schedule computation process. This paper addresses the loop phenomenon of two-way multiple overlapping relationships in a BDM network as well as proposes the solutions of them, and then presents a practical application of two-way multiple overlapping relationships at a real project.
基金supported by the National Natural Science Foundation of China under Grant 51277009.
文摘Taking advantage of the information sharing mechanism in smart substations,a distributed protection based on multiple overlapping units is introduced in this paper.The area division and the construction of protection units are studied based on the principle of differential protection.Mutual perception and information interaction among units,calculation with multisource information and coordinated protection schemes are proposed to improve the reliability and adaptability of the substation protection system.A multi agent system(MAS)approach is used to model the units’working process in various situations,such as communication failure and sampled data failure.Test results demonstrate that the method can accelerate the backup protection as well as reduce the power-off range.
文摘Arterial stenosis is a critical condition with increasing prevalence among pediatric patients and young adults,making its investigation highly significant.Despite extensive studies on blood flow dynamics,limited research addresses the combined effects of nanoparticles and arterial curvature on unsteady pulsatile flow through multiple stenoses.This study aims to analyze the influence of nanoparticles on blood flow characteristics in realistic curved arteries with mild to severe overlapped constrictions.Using curvilinear coordinates,the thermal energy and momentum equations for nanoparticle-laden blood were derived,and numerical results were obtained through an explicit finite difference method.Key findings reveal that nanoparticle injections reduce blood temperature intensity,while arterial curvature strongly affects flow symmetry.Moreover,temperature,axial velocity,wall shear stress,and volumetric flow rate decrease significantly in severe stenosis compared to mild and moderate cases.These results provide new insights into nanoparticle-assisted blood flow under complex stenotic conditions and may contribute to improved diagnostic and therapeutic strategies for cardiovascular diseases.
