نتایج جستجو برای: ichnotaxonomic analysis nayband formation
تعداد نتایج: 3267491 فیلتر نتایج به سال:
Han characters (kanji) used in written Japanese come from China, but there are created separately Japan called kokuji. This research aims to investigate the formation of kokuji according Peirce’s semiotics and rikusho (traditional classification Chinese characters) by Xu Shen, one additional proposed character category—namely, kaii-keisei class. The method this study is library research. Of 87 ...
We present a numerical framework for solving localized pattern structures of reaction-diffusion type far from the Turing regime. We exploit asymptotic structure in a set of well established pattern formation problems to analyze a singular limit model that avoids time and space adaptation typically associated to full numerical simulations of the same problems. The singular model involves the mot...
The formation pressure plays a very important role in drilling engineering. So it is of great significance to predict formation pressure before drilling. In order to solve the problem, the concept of formation matrix and wellbore matrixwere put forward. Also the method of epitaxial transplantation for the regional formation pressurewas proposed. With the concept of wellbore pressure matrix, the...
The tube wave, or low-frequency manifestation of the Stoneley wave, has been modeled previously using the quasi-static approximation; I extend this method to include the effect of the formation matrix compressibility, which tends to marginally increase the tube-wave attenuation. Using the Biot theory of poroelasticity, I develop a fully dynamic description of the Stoneley wave. The dispersion r...
We construct a two dimensional Cellular Automata based model for the description of pedestrian dynamics. Wide range of complicated pattern formation phenomena in pedestrian dynamics are described in the model, e.g. lane formation, jams in a counterflow and egress behavior. Mean-field solution of the densely populated case and numerical solution of the sparsely populated case are provided. This ...
We discuss social network analysis from the perspective of economics. We organize the presentation around the theme of externalities: the effects that one’s behavior has on others’ welfare. Externalities underlie the interdependencies that make networks interesting to social scientists. We discuss network formation, as well as interactions between peoples’ behaviors within a given network, and ...
Abstract. Motion by mean curvature is a problem arising in multi-phase thermomechanics and pattern formation. The article presents a numerical comparison of two approaches to the dynamics of closed curves, namely sharp-interface description leading to a degenerate-diffusion equation of slow and fast diffusion types related to anisotropic curve shortening flow, and a diffusive-interface descript...
In this paper, we propose the application of a semi-parametric statistical methodology called GroupBased Developmental Trajectory Analysis to studying the dynamics of social networks. We begin with a discussion of theoretical problems in network analysis that may benefit from this approach. Next, we describe the methodology and how it can be applied to dyadic network data as well as aggregated ...
We consider a novel asymptotic limit of model equations proposed to describe the formation of localised states in a vertically vibrated layer of granular material or viscoelastic fluid. In physical terms, the asymptotic limit is motivated by experimental observations that localised states (‘oscillons’) arise when regions of weak excitation are nevertheless able to expel material rapidly enough ...
Households provide environments that encourage the formation of microbial communities, often as biofilms. Such biofilms constitute potential reservoirs for pathogens, particularly for immune-compromised individuals. One household environment that potentially accumulates microbial biofilms is that provided by vinyl shower curtains. Over time, vinyl shower curtains accumulate films, commonly refe...
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