2,179 research outputs found
Product innovation and logistic optimization in a novel urban-type model
We consider the strategic choice between product innovation and logistic optimization in a novel urban framework where consumers are distributed across the city and have different incomes depending on their location in the town. Depending on the relative efficiency of the product innovation process and the logistic innovation process as well as on the degree of spatial symmetry between the firms, both symmetric and asymmetric business strategy equilibria may arise, as well as both unique and multiple business strategy equilibria.Product innovation; logistic optimization; linear town
Existence and uniqueness of maximal regular flows for non-smooth vector fields
In this paper we provide a complete analogy between the Cauchy-Lipschitz and
the DiPerna-Lions theories for ODE's, by developing a local version of the
DiPerna-Lions theory. More precisely, we prove existence and uniqueness of a
maximal regular flow for the DiPerna-Lions theory using only local regularity
and summability assumptions on the vector field, in analogy with the classical
theory, which uses only local regularity assumptions. We also study the
behaviour of the ODE trajectories before the maximal existence time. Unlike the
Cauchy-Lipschitz theory, this behaviour crucially depends on the nature of the
bounds imposed on the spatial divergence of the vector field. In particular, a
global assumption on the divergence is needed to obtain a proper blow-up of the
trajectories.Comment: 38 page
The Plant Simulator as viable means to prevent and manage risk through competencies management: Experiment results
AbstractMaking decisions and managing competences in complex systems is a challenging task to accomplish. Specifically, the process industry is known for its complexity and sensitivity to critical procedures. Recent disasters like the “Deepwater Horizon” (2010, 11 fatalities), BP Texas City (2005, 15 fatalities), and AZF Toulouse (2001, 29 fatalities), clearly showed the risk to which we are all exposed. The increasing complexity of processes, due to the simultaneous escalation of automation, optimisation and intensification processes (followed to face globalisation challenges), are moving the attention to the management of abnormal situations, which are even more complex in nature and frequent. This increasing complexity, coupled with the fact that abnormal situations may lead to irreversible losses, is imposing the adoption of adequate approaches and tools that allow for better learning and properly managing abnormal situations. The paper presents a simulation-enabled, experiment-based approach that can be used to prevent and manage risk through competencies management. More specifically, the paper presents the results of the first experiment campaign performed in a Plant Simulator (PS), the first known in the process industry domain, and shows the efficacy of using Immersive Virtual Environments (IVE) both to make decisions and to train teams (not just single operators).The experiment results presented in the paper show the effectiveness of IVE to increase the competencies and train operators and managers. In addition, they explain how conveniently the data collected by means of the PS can be used for making daily decisions to better prevent and manage risks
The Plant Simulator as viable means to prevent and manage risk through competencies management: Experiment results
Making decisions and managing competences in complex systems is a challenging task to accomplish.
Specifically, the process industry is known for its complexity and sensitivity to critical procedures.
Recent disasters like the ‘‘Deepwater Horizon” (2010, 11 fatalities), BP Texas City (2005, 15 fatalities),
and AZF Toulouse (2001, 29 fatalities), clearly showed the risk to which we are all exposed. The increasing
complexity of processes, due to the simultaneous escalation of automation, optimisation and intensification
processes (followed to face globalisation challenges), are moving the attention to the management of
abnormal situations, which are even more complex in nature and frequent. This increasing complexity,
coupled with the fact that abnormal situations may lead to irreversible losses, is imposing the adoption
of adequate approaches and tools that allow for better learning and properly managing abnormal situations.
The paper presents a simulation-enabled, experiment-based approach that can be used to prevent
and manage risk through competencies management. More specifically, the paper presents the results of
the first experiment campaign performed in a Plant Simulator (PS), the first known in the process industry
domain, and shows the efficacy of using Immersive Virtual Environments (IVE) both to make decisions
and to train teams (not just single operators).
The experiment results presented in the paper show the effectiveness of IVE to increase the competencies
and train operators and managers. In addition, they explain how conveniently the data collected by
means of the PS can be used for making daily decisions to better prevent and manage risks
Emerging properties of non-crystalline phases of graphene and boron nitride based materials
Altres ajuts: ICN2 is funded by the CERCA Programme/Generalitat de Catalunya.We review recent developments on the synthesis and properties of two-dimensional materials which, although being mainly of an sp bonding character, exhibit highly disordered, non-uniform and structurally random morphologies. The emergence of such class of amorphous materials, including amorphous graphene and boron nitride, have shown superior properties compared to their crystalline counterparts when used as interfacial films. In this paper we discuss their structural, vibrational and electronic properties and present a perspective of their use for electronic applications
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