We report a computer simulation study of the influence of topological constraints on the statics and dynamics of single ring polymers and ring polymers in the melt. We show that single rings have identical static and dynamic scaling behavior regardless of the presence of topological constraints. For rings in the melt we find that the scaling behavior is significantly influenced by the presence ...

We describe the use of an automated scheduling system intended to assist in the early development of space missions. This tool creates observations of both (a) targeted geographical regions of interest and (b) general mapping observations, while respecting spacecraft constraints such as data volume, observation timing, visibility, lighting, season, and science priorities. This tool therefore mu...

We synthesize the financial crisis contagion literature through the gravity model from physics and test the hypothesis that the severity of contagion relates positively to trade and financial linkages but negatively to psychic distance between countries, when macroeconomic fundamentals and institutional factors are controlled. The psychic distance variable, a behavioral predictor constructed al...

The Internet’s tremendous value is undoubtedly dependent on its universal connectivity among a great number of heterogeneous networks that are distributed over the world. In recent years, while the Internet’s scale has expanded exponentially, the current status of its connectivity is still in the lack of comprehensive and formal study. In this paper, we contribute to the understanding of Intern...

This paper explores the spatial and temporal diffusion of political violence in North and West Africa. It does so by endeavoring to represent the mental landscape that lives in the back of a group leader’s mind as he contemplates strategic targeting. We assume that this representation is a combination of the physical geography of the target environment, and the mental and physical cost of follo...

Rational choice when preferences are not required to be transitive and complete has been discussed in the literature for years. In this article transitivity and completeness of the preference relation is also not assumed. It will be shown that nevertheless the existence of a competitive equilibrium can be proven when those properties are replaced by a domination property which allows that there...

We present a comprehensive study of the use of value precedence constraints to break value symmetry. We first give a simple encoding of value precedence into ternary constraints that is both efficient and effective at breaking symmetry. We then extend value precedence to deal with a number of generalizations like wreath value and partial interchangeability. We also show that value precedence is...

This paper studies the impact of the R&D offshoring of multinational enterprises on the firms in host emerging economies. We develop a two-stage non-cooperative game to analyze the strategic interaction between multinational and host country enterprises engaged in R&D investment. An empirical analysis of 12,309 manufacturing firms in the ICT industry in China shows that R&D offshoring has a pos...

Geographical life-space is an important factor to consider when studying subjective wellbeing of older adults. The purpose this article twofold: provide in-depth understanding 1) the geographical life-spaces in which lives adults take place and 2) relation between experienced levels wellbeing. Seventy-six (aged 65 older) participated our qualitative study. We applied a research approach, throug...

Valuable resources often exist at distant points from a firm’s current locations, so that strategic decisions such as growth have a spatial dimension in which firms seek information and choose between geographically distributed alternatives. Studies show that geographic proximity facilitates the flow of resources, but there is limited understanding of factors that exacerbate or ease the impact ...