It is argued that the present log-normal distribution of language sizes is, to a large extent, a consequence of demographic dynamics within the population of speakers of each language. A two-parameter stochastic multiplicative process is proposed as a model for the population dynamics of individual languages, and applied over a period spanning the last ten centuries. The model disregards langua...

Peptide-doped trehalose thin films have been characterized by bombardment with energetic cluster ion beams of C60+ and Aux+ (x = 1, 2, 3). The aim of these studies is to acquire information about the molecular sputtering process of the peptide and trehalose by measurement of secondary ion mass spectra during erosion. This system is important since uniform thin films of approximately 300 nm thic...

Although overcrowded and the depopulation of the population are one of the social issues in Japan, the complex mechanisms are not comprehended. Then, we tried to show this phenomenon by catching as a network. We interpreted prefectures as nodes and migration as links. We observe power law distribution in both population and migration. We insist on the necessity of reconsider the prevailing assu...

Article history: Received 16 May 2014 Received in revised form 3 September 2014 Accepted 15 September 2014 Available online 22 September 2014

The dynamic behavior of the single-walled carbon nanotubes (SWCNTs) is studied based on the flexibly connected space-frame model which was proposed to simulate the static elastic properties of SWCNTs by the authors previously. The frequencies of SWCNTs with the clamped-free and clamped-clamped boundary conditions and the different ratios of length to diameter are computed. The resulting frequen...

Dynamically complex multi-dimensional societal issues are societal issues characterised by complex time evolutionary behaviour on multiple dimensions, and very often also by many uncertainties, multiple views and parties concerned, and different ethical aspects. It will be argued here that stand-alone system dynamics often needs to be complemented with other methodologies or disciplines –for ex...