BACKGROUND The purpose of this study was to evaluate the correlation among intratumoral blood flow as assessed by color Doppler ultrasonography, clinicopathological findings and the Nottingham Prognostic Index (NPI). METHODS Twenty-seven patients with breast cancer were examined. All patients received surgical treatment. Color Doppler ultrasonography was performed prior to surgery to detect a...

Non-Newtonian models with shear-thinning viscosity are commonly used to solve a variety of complex flow problems. A new finite-volume discretization based upon an unstructured grid is used to integrate the differential form of the lattice Boltzmann equation with a shear-dependent viscosity, using a cell-vertex finite-volume technique. The unknown fields are placed at the nodes of the mesh and e...

This paper describes and analyzes the spatial spread of tuberculosis (TB) on complex metapopulation, that is, networks of populations connected by migratory flows whose configurations are described in terms of connectivity distribution of nodes (patches) and the conditional probabilities of connections among classes of nodes sharing the same degree. The migration and transmission processes occu...

— One of the more overlooked aspects of globalization is the circulation of modern managerial practices and knowledges through transnational networks of nongovernmental organizations (NGOs). In this paper, we offer an analytical framework for understanding the complex circulation of managerialism through dispersed networks of NGOs, connecting the spatially extensive international NGO (INGO) sec...

Wireless ad-hoc networks are based on shared medium technology where the nodes arrange access to the medium in a distributed way independent of their current traffic demand. This has the inherent drawback that a node that serves as a relay node for transmissions of multiple neighboring nodes is prone to become a performance “bottleneck”. In the present paper such a bottleneck node is modeled vi...

The paper analyzes a continuous time flow control system, with flow of a general quantity from a source node to a sink node. The flow is one-directional, meaning that there is a saturation between the nodes that limits the flow to be positive and below a maximum. The controlled plant is located in the sink node and the controller is located in the source node. The plant and the controller are m...

Despite recent progress in understanding of how left–right (L– R) asymmetry is generated during vertebrate development, many important questions still unanswered. One such question concerns the mechanism by which the signal responsible for the generation of L–R asymmetry is transferred from the node to the lateral plate. This signal, whose identity remains unknown, is generated in the node, and...

– The problem of sending the maximum amount of flow q between two arbitrary nodes s and t of complex networks along links with unit capacity is studied, which is equivalent to determining the number of link-disjoint paths between s and t. The average of q over all node pairs with smaller degree kmin is q k min ≃ c kmin for large kmin with c a constant implying that the statistics of q is relate...