Better-performing younger adults typically express greater brain signal variability relative to older, poorer performers. Mechanisms for age and performance-graded differences in brain dynamics have, however, not yet been uncovered. Given the age-related decline of the dopamine (DA) system in normal cognitive aging, DA neuromodulation is one plausible mechanism. Hence, agents that boost systemi...

Decision-makers in the public policy and business arenas need tools to deal with multiple sources of complexity Circular Economy (CE) transitions. System Dynamics (SD) facilitates coping increased by enabling closed-loop thinking via identifying causal structures underlying behaviour permitting proactively experiment system through simulation. This research aims propose test an SD-based framewo...

In this paper we present a numerical method to calculate the dynamics of three spheres in a quiescent viscous fluid. The method is based on Lamb’s solution to Stokes flow and the method of reflections, and is arbitrarily accurate given sufficient computer memory and time. It is more accurate than multipole methods, but much less efficient. Although it is too numerically intensive to be suitable...

Under sustainable development pressures, organizations have to consider the relationship between the environment and activities of supply, production, distribution, consumption and disuse, which is known as “green supply chain management” (GSCM). The article presents an overview of research work in these areas, followed by an introduction of the green concept in SCM resorting to System Dynamics...

Experimental evidences point out the participation of nonsynaptic mechanisms (e.g., fluctuations in extracellular ions) in epileptiform bursting and spreading depression (SD). During these abnormal oscillatory patterns, it is observed an increase of extracellular potassium concentration [K(+)](o) and a decrease of extracellular calcium concentration [Ca(2+)](o) which raises the neuronal excitab...

spreading depression (sd), discovered by leao in 1944, is a pathophysiological wave which propagates slowly in the brain (3 mm/min) and cause dramatic ionic and hemodynamic changes. sd appears to act through several mechanisms and receptors which have not completely understood. here, we studied the effect of inhibitory system in animal model of sd using immunohistochemistry technique. after imp...

Researching the control of cumulative risk for submarine tunnel shield construction is great significance improving management capability. Firstly, concepts risk, fragility, and theory system dynamics (SD) are introduced. Secondly, conduction network established, mechanism based on fragility analyzed. Then, model established by SD. Finally, Dalian Metro Line 5 Cross-sea Large Diameter Shield Co...

Knowledge management (KM) strategy is the planned or actual coordination of a firm’s major goals and learning, in time, that continually co-align its knowledge-based resources with the environment. This study combined a survey study and system dynamics (SD) simulation to demonstrate an organic KM performance evaluation approach. The survey study was conducted based on a sample of 143 constructi...

Online analytical processing (OLAP) as a modern business intelligence (BI) concept provides support for representing vast amounts of data for supporting management " s decisions. Though, there is no inherent support for the representation of causal structures which could provide a foundation for advanced analysis like what-if or scenario techniques. System Dynamics (SD) is an approach with a lo...

Online analytical processing (OLAP) as a modern business intelligence (BI) concept provides support for representing vast amounts of data for supporting management’s decisions. Though, there is no inherent support for the representation of causal structures which could provide a foundation for advanced analysis like what-if or scenario techniques. System Dynamics (SD) is an approach with a long...