Qualifying types represent a new approach to modifying the behaviour of instances of other types in a general way, in the form of components which can be designed and implemented without a prior knowledge of the types to be modified or their implementations. This paper illustrates the idea by showing how they can be used to program various standard synchronisation problems, including mutual exc...

Industry cluster and supply chain are in focus of every countries which rely on knowledge-based economy. Both focus on improving the competitiveness of firm in the industry in the different aspect. This paper tries to illustrate how the industry cluster can increase the supply chain performance. Then, the proposed methodology concentrates on the collaboration and knowledge exchange in supply ch...

The authors explore Massively Multiplayer Online Games (MMOG) business models in order to characterize two main problems: big initial investment and continuous expenditures. The four main actors of a MMOG environment – game producer, Game, Players and Business Model – are analysed resorting to Actor Network Theory in order to understand their alignment in Business Models and how they can influe...

Directional dispersal plays a large role in shaping ecological processes in diverse systems such as rivers, coastlines and vegetation communities. We describe an instability driven by directional dispersal in a spatially explicit consumer–producer model where spatial patterns emerge in the absence of external environmental variation. Dispersal of the consumer has both undirected and directed co...

Since Marshall, the standard approach to developing a theory of competitive markets is to separate demand behavior (“consumer theory”) from supply behavior (“producer theory”) and then use the notion of market equilibrium to reconcile demand and supply. This note studies producer theory and a separate one studies consumer theory. The standard model has the following features. Firms are describe...

In frequency-dependent games, strategy choice may be innate or learned. While experimental evidence in the producer-scrounger game suggests that learned strategy choice may be common, a recent theoretical analysis demonstrated that learning by only some individuals prevents learning from evolving in others. Here, however, we model learning explicitly, and demonstrate that learning can easily ev...

A general review of the relevance of classical novae for the chemical evolution of the Galaxy, as well as for Galactic radioactivity is presented. A special emphasis is put on the pioneering work done by Jim Truran in this field of research. The impact of recent developments in nuclear astrophysics on nova nucleosynthesis, together with the prospects for observability of novae radioactivities w...

We analyze the incentives of a vertically-integrated producer (VIP) to engage in “self-sabotage”. Self-sabotage occurs when a VIP intentionally increases its upstream costs and/or reduces the quality of its upstream product. We identify conditions under which self-sabotage is profitable for the VIP even though it raises symmetrically the cost of the upstream product to all downstream producers ...