20 papers · ranked by Valyu relevance
Elizabeth A. Dinkelman, Walter D. Morris
The polytope ASMn, the convex hull of the n×n alternating sign matrices, was introduced by Striker and by Behrend and Knight. A face of ASMn corresponds to an elementary flow grid defined by Striker, and each elementary flow grid determines a doubly directed graph defined by Brualdi and Dahl. We show that a face of…
Ashley N. Edelen, Sarah Cashman, Ben Young, Wesley W. Ingwersen
As a fundamental component of data for life cycle assessment models, elementary flows have been demonstrated to be a key requirement of life cycle assessment data interoperability. However, existing elementary flow lists have been found to lack sufficient structure to enable improved interoperability between life cycle…
Antonio Valente, Carl Vadenbo, Simone Fazio, Koichi Shobatake + 6 more
2## Materials and methods The goal of the GLAD NWG project is to develop a common system to map the elementary flow lists in the nomenclature systems used by different background LCA databases connected to GLAD. This paper aims at describing the mapping procedure adopted in the context of the GLAD NWG and to summarize…
J. Vass
Fully Developed Turbulence (FDT) is a theoretical asymptotic phenomenon which can only be approximated experimentally or computationally, so its defining characteristics are hypothetical. It is considered to be a chaotic stationary flow field, with self-similar fractalline features. A number of approximate models…
Jan Marcus Hartmann, David Yang Shu, André Bardow, Niklas von der Assen
Absolute environmental sustainability assessment (AESA) enables the comparison of the environmental burdens from economic sectors against sector-specific thresholds for environmental sustainability. Implementing AESA requires data to establish sector-specific sustainability thresholds and to characterise the…
Jean-Marc Schwartz, Minoru Kanehisa
Background Elementary mode analysis of metabolic pathways has proven to be a valuable tool for assessing the properties and functions of biochemical systems. However, little comprehension of how individual elementary modes are used in real cellular states has been achieved so far. A quantitative measure of fluxes…
Stefan Müller, Diana Széliová, Jürgen Zanghellini
Traditional (genome-scale) metabolic models of cellular growth involve an approximate biomass “reaction”, which specifies biomass composition in terms of precursor metabolites (such as amino acids and nucleotides). On the one hand, biomass composition is often not known exactly and may vary drastically between…
Donatello Dolce
> Abstract. Elementary particles, i.e. the basic constituents of nature, are characterized by quantum recurrences in time. The flow of time of every physical system can be therefore decomposed in elementary cycles of time. This allows us to enforce the local nature of relativistic time, yielding interesting unified…
Kalyan Gayen, KV Venkatesh
Background Quantification of the metabolic network of an organism offers insights into possible ways of developing mutant strain for better productivity of an extracellular metabolite. The first step in this quantification is the enumeration of stoichiometries of all reactions occurring in a metabolic network. The…
Stefan Müller
Elementary vectors are fundamental objects in polyhedral geometry. In metabolic pathway analysis, elementary vectors range from elementary flux modes (of the flux cone) and elementary flux vectors (of a flux polyhedron) via elementary conversion modes (of the conversion cone) to minimal cut sets (of a dual polyhedron)…
Luis Sordo Vieira, Paola Vera-Licona
Different objects exist to describe how a signal transduces in a given intracellular signaling network, such as elementary signaling modes, T-invariants, extreme pathway analysis, elementary modes and simple paths. For modeling frameworks such as Boolean networks, Petri nets and hypergraphs, these signal transduction…
Stefan Müller, Michael Predl, Diana Széliová, Jürgen Zanghellini
Understanding microbial communities is essential for progress in ecology, biotechnology, and human health. Recently, constraint-based metabolic models of individual organisms have been combined to study microbial consortia. In this work, we present a geometric framework for characterizing all feasible microbial…
Asher Yahalom, Esteban Calzetta
In previous papers, it has been shown how Schrödinger’s equation which includes an electromagnetic field interaction can be deduced from a fluid dynamical Lagrangian of a charged potential flow that interacts with an electromagnetic field. The quantum behaviour is derived from Fisher information terms added to the…
Authors not listed
In this paper we continue our previous investigation about the use of stress function in the flow of generalized Newtonian fluids through conduits of circular and non-circular (or/and multiply connected) cross sections where we inspect the flow of power law fluids in tubes of elliptical cross sections. We derive…
Kaustav A. Gopinathan, Avanish Mishra, Baris R. Mutlu, Jon F. Edd + 1 more
Microfluidics have enabled significant advances in molecular biology^1–3^, synthetic chemistry^4,5^, diagnostics^6,7^, and tissue engineering^8^. However, there has long been a critical need in the field to manipulate fluids and suspended matter with the precision, modularity, and scalability of electronic…
Brian Teague
Cytoflow is a free, open-source flow cytometry toolbox that enables quantitative and reproducible analyses of flow cytometry experiments. Comprised of a set of well-documented Python modules wrapped by a graphical user interface, Cytoflow allows both programmers and bench scientists to apply modern data analysis…
Barrett Smith, Sara Hashmi
Polymer flows through pores, nozzles and other small channels govern engineered and naturally occurring dynamics in many processes, from 3D printing to oil recovery in the earth's subsurface to a wide variety of biological flows. The crosslinking of polymers can change their material properties dramatically, and it is…
Adam Hawkins
Despite their foundations in classical mechanics, hydrodynamic models have experienced a resurgence in modern physics, particularly in the context of electron-phonon interactions. These “tantalizing parallels1” between modern physics and hydrodynamics have not, however, seen a similar resurgence in the context of…
Olukayode Majekodunmi, Sara Hashmi
In suspension flows through microchannels with parallel walls, rigid particles form clogs that grow continuously in the upstream direction. However, introducing a slight taper to channel walls leads to a qualitatively different clogging mechanism. Clogs of rigid particles do not grow continuously in these tapered…
Zhiqi Li, Duowen Chen, C. C. Lin, J.T.C. Liu + 1 more
Flow Map. During the motion of fluid with velocity u (x) = u(x, ), ∀ > 0, consider an arbitrary fluid particle moves from the position x ∈ Ω at the initial time to the position x ∈ Ω at the current time , where Ω and Ω represent the domain at times and respectively. The positions x and x can be associated using the…