Wind-induced vibrations commonly represent the leading criterion in the design of long-span bridges. The aerodynamic forces in bridge aerodynamics are mainly based on the quasi-steady and linear unsteady theory. This ...Wind-induced vibrations commonly represent the leading criterion in the design of long-span bridges. The aerodynamic forces in bridge aerodynamics are mainly based on the quasi-steady and linear unsteady theory. This paper aims to investigate different formulations of self-excited and buffeting forces in the time domain by comparing the dynamic response of a multi-span cable-stayed bridge during the critical erection condition. The bridge is selected to represent a typical reference object with a bluff con- crete box girder for large river crossings. The models are viewed from a perspective of model complexity, comparing the influence of the aerodynamic properties implied in the aerodynamic models, such as aerodynamic damping and stiffness, fluid memory in the buffeting and self-excited forces, aerodynamic nonlinearity, and aerodynamic coupling on the bridge response. The selected models are studied for a windspeed range that is typical for the construction stage for two levels of turbulence intensity. Furthermore, a simplified method for the computation of buffeting forces including the aerodynamic admittance is presented, in which rational approximation is avoided. The critical flutter velocities are also compared for the selected models under laminar flow.展开更多
To compare intravenous Dezocine Tropisetron in reatment of shivering after spinal anesthesia in cesarean. A double-blind trail. From January to June 2014 90 cases elective cesarean under spinal anesthesia randomly div...To compare intravenous Dezocine Tropisetron in reatment of shivering after spinal anesthesia in cesarean. A double-blind trail. From January to June 2014 90 cases elective cesarean under spinal anesthesia randomly divided into three groups of 30, the control group A （Sml saline） given to dezocine （10mg / 5ml） B grou, given tropisetron （5mg / 5ml） C group. The incidence of shivering in groups 46.48%, 31.18%, 60.83% （P = 〈0.01）. Bradycardia is a group （A） 3.3%, the group （B） is 0.0%. Significant differences in other variables （myoclonic seizures and rash） no significant （P = 0.353）. Dezocine and Tropisetron alone can cure shivering effectively for cesarean section after spinal anesthesia.展开更多
Let Q be a quiver with automorphism σ. We prove that semistable representations of Q over F_q give rise to semistable modules over the F_q-algebra A(Q, σ; q) associated with(Q, σ). As an application, we obtain a de...Let Q be a quiver with automorphism σ. We prove that semistable representations of Q over F_q give rise to semistable modules over the F_q-algebra A(Q, σ; q) associated with(Q, σ). As an application, we obtain a description of the semistable subcategories of A(Q, σ; q)-modules and determine the slopes of semistable A(Q, σ; q)-modules in the case that Q is a Dynkin or tame quiver.展开更多
We build a connection between iterated tilted algebras with trivial cluster tilting subcategories and tilted algebras of finite type.Moreover,all tilted algebras with cluster tilting subcategories are determined in te...We build a connection between iterated tilted algebras with trivial cluster tilting subcategories and tilted algebras of finite type.Moreover,all tilted algebras with cluster tilting subcategories are determined in terms of quivers.As a result,we draw the quivers of Auslander's 1-Gorenstein algebras with global dimension 2 admitting trivial cluster tilting subcategories,which implies that such algebras are of finite type but not necessarily Nakayama.展开更多
基金supported by the German Research Foundation (DFG) via Research Training Group ‘‘Evaluation of Coupled Numerical and Experimental Partial Models in Structural Engineering (GRK 1462)"
文摘Wind-induced vibrations commonly represent the leading criterion in the design of long-span bridges. The aerodynamic forces in bridge aerodynamics are mainly based on the quasi-steady and linear unsteady theory. This paper aims to investigate different formulations of self-excited and buffeting forces in the time domain by comparing the dynamic response of a multi-span cable-stayed bridge during the critical erection condition. The bridge is selected to represent a typical reference object with a bluff con- crete box girder for large river crossings. The models are viewed from a perspective of model complexity, comparing the influence of the aerodynamic properties implied in the aerodynamic models, such as aerodynamic damping and stiffness, fluid memory in the buffeting and self-excited forces, aerodynamic nonlinearity, and aerodynamic coupling on the bridge response. The selected models are studied for a windspeed range that is typical for the construction stage for two levels of turbulence intensity. Furthermore, a simplified method for the computation of buffeting forces including the aerodynamic admittance is presented, in which rational approximation is avoided. The critical flutter velocities are also compared for the selected models under laminar flow.
文摘To compare intravenous Dezocine Tropisetron in reatment of shivering after spinal anesthesia in cesarean. A double-blind trail. From January to June 2014 90 cases elective cesarean under spinal anesthesia randomly divided into three groups of 30, the control group A （Sml saline） given to dezocine （10mg / 5ml） B grou, given tropisetron （5mg / 5ml） C group. The incidence of shivering in groups 46.48%, 31.18%, 60.83% （P = 〈0.01）. Bradycardia is a group （A） 3.3%, the group （B） is 0.0%. Significant differences in other variables （myoclonic seizures and rash） no significant （P = 0.353）. Dezocine and Tropisetron alone can cure shivering effectively for cesarean section after spinal anesthesia.
基金supported by National Natural Science Foundation of China(Grant No.11271043)
文摘Let Q be a quiver with automorphism σ. We prove that semistable representations of Q over F_q give rise to semistable modules over the F_q-algebra A(Q, σ; q) associated with(Q, σ). As an application, we obtain a description of the semistable subcategories of A(Q, σ; q)-modules and determine the slopes of semistable A(Q, σ; q)-modules in the case that Q is a Dynkin or tame quiver.
文摘We build a connection between iterated tilted algebras with trivial cluster tilting subcategories and tilted algebras of finite type.Moreover,all tilted algebras with cluster tilting subcategories are determined in terms of quivers.As a result,we draw the quivers of Auslander's 1-Gorenstein algebras with global dimension 2 admitting trivial cluster tilting subcategories,which implies that such algebras are of finite type but not necessarily Nakayama.
