Transition to hexagonal pattern under the variation of intrinsic length scales of a reaction diffusion system

The intrinsic length scales of a reaction diffusion system (Gierer-Meinhardt model)is varied by quasi-statically changing the diffusion constant of the activator and a transition from rolls to hexagon is detected. The transition is hysteretic or first order like. From stability analysis, we also analytically show the possibility of such transitions.Comment: One .tex file and four .ps file

Weights for Objects of Monoids

The main objective of the paper is to define the construction of the object of monoids, over a monoidal category object in any 2-category with finite products, as a weighted limit. To simplify the definition of the weight, we use matrices of symmetric (possibly colored) operads that define some auxiliary categories and 2-categories. Systematic use of these matrices of operads allows us to define several similar objects as weighted limits. We show, among others, that the constructions of the object of bi-monoids over a symmetric monoidal category object or the object of actions of monoids along an action of a monoidal category object can be also described as weighted limits.Comment: 19 page

An eagle eye: Africa in the 20th Century as viewed through the archives of Barclays Bank

Barclays’ international business was founded in 1925 as Barclays Bank (Dominion, Colonial and Overseas). The roots of the business lay in three 19th century banks: the Anglo-Egyptian, the Colonial, and the National Bank of South Africa. It had long been the dream of Barclays Chairman, Frederick Goodenough, to create an ‘Empire Bank’, and by buying these three and merging them, that is precisely what he achieved. This article sets out to provide an overview of the collection and suggest avenues of future research

Scaling of internode distances in weighted complex networks

We extend the previously observed scaling equation connecting the internode distances and nodes' degrees onto the case of weighted networks. We show that the scaling takes a similar form in the empirical data obtained from networks characterized by different relations between node's strength and its degree. In the case of explicit equation for s(k) (e.g. linear or scale-free), the new coefficients of scaling equation can be easily obtained. We support our analysis with numerical simulations for Erdos-Renyi random graphs with different weight distributions.Comment: 9 pages, 4 figures, submitted to International Journal of Modern Physics

Impact of lexical and sentiment factors on the popularity of scientific papers

We investigate how textual properties of scientific papers relate to the number of citations they receive. Our main finding is that correlations are non-linear and affect differently most-cited and typical papers. For instance, we find that in most journals short titles correlate positively with citations only for the most cited papers, for typical papers the correlation is in most cases negative. Our analysis of 6 different factors, calculated both at the title and abstract level of 4.3 million papers in over 1500 journals, reveals the number of authors, and the length and complexity of the abstract, as having the strongest (positive) influence on the number of citations.Comment: 9 pages, 3 figures, 3 table

Risky business: managing electronic payments in the 21st Century

On June 20 and 21, 2005, the Payment Cards Center of the Federal Reserve Bank of Philadelphia, in conjunction with the Electronic Funds Transfer Association (EFTA), hosted a day-and-a-half forum, “Risky Business: Managing Electronic Payments in the 21st Century.” The Center and EFTA invited participants from the financial services and processing sectors, law enforcement, academia, and policymakers to explore key topics associated with the challenge of effectively managing risk in a payments environment that is increasingly electronic. The meeting’s goal was to identify areas of potential risk and explore interindustry solutions. This paper provides highlights from the forum presentations and ensuing conversations.