Double Scattering in a Structured System of Particles

1983 ◽  
pp. 237-241
Author(s):  
T. W. Taylor ◽  
B. J. Ackerson
Keyword(s):  
Double Scattering ◽  
System Of Particles ◽  
Structured System

Designing a Virtual Enterprise Architecture using Structured System Dynamics

2006 ◽  
Vol 25 (1) ◽  
pp. 13-29
Author(s):  
Nikitas A. Assimakopoulos ◽  
Anastasios N. Riggas
Keyword(s):  
System Dynamics ◽  
Enterprise Architecture ◽  
Business Processes ◽  
Core Competencies ◽  
Virtual Enterprise ◽  
Business Goals ◽  
Starting Point ◽  
Efficient Integration ◽  
Structured System ◽  
The Impact

The starting point for establishing a Virtual Enterprise is a set of existing enterprises which might contribute with some of their functionalities (core competencies) to the formation of the virtual entity. The most important issue, in this formation, is the rapid integration of the business processes of the participating companies. The architecture of the VE must assist companies desiring to enter into a virtual relationship by defining the functions and interfaces of critical business processes, thus allowing for a more rapid and efficient integration of the expertise which will be contributed by each partner in the virtual enterprise. While the integration of computer and communication technologies are no doubt critical issues, the successful attainment of the business goals of the virtual enterprise often depends on its ability to align the business processes and practices of partner enterprises. Focus of this paper, is the presentation of Structured System Dynamics (SSPS) multi-methodology for the design and the evaluation of a Virtual Enterprise Architecture. SSPS uses Systems Thinking and System Dynamics principles as launch pad for its approach. The Systemic Methodologies of Problem Structuring Methodology (PSM) and SAST are also integrated in this new Multi-Methodology. SSPS is a new practical and scientific tool in designing and evaluating a VE architecture providing the ability to determine the impact, reliability, success of the Architectures' models created, refine them and identify potential process improvements. A framework for the rapid and efficient integration of the business processes of the participating companies in the virtual enterprise is provided. For this multi-methodology, a real-life application is also presented for a Virtual Enterprise that constructs Wireless Payment Mechanisms.

scholarly journals Hyperbolic Center of Mass for a System of Particles in a Two-Dimensional Space with Constant Negative Curvature: An Application to the Curved 2-Body Problem

Mathematics ◽  
2021 ◽  
Vol 9 (5) ◽  
pp. 531
Author(s):  
Pedro Pablo Ortega Palencia ◽  
Ruben Dario Ortiz Ortiz ◽  
Ana Magnolia Marin Ramirez
Keyword(s):  
Negative Curvature ◽  
Dimensional Space ◽  
Center Of Mass ◽  
Simple Expression ◽  
Two Dimensional ◽  
Constant Negative Curvature ◽  
Euclidean Case ◽  
System Of Particles ◽  
Material Points ◽  
The One

In this article, a simple expression for the center of mass of a system of material points in a two-dimensional surface of Gaussian constant negative curvature is given. By using the basic techniques of geometry, we obtained an expression in intrinsic coordinates, and we showed how this extends the definition for the Euclidean case. The argument is constructive and serves to define the center of mass of a system of particles on the one-dimensional hyperbolic sphere LR1.

scholarly journals Integrodifference master equation describing actively growing blood vessels in angiogenesis

2020 ◽  
Vol 21 (7-8) ◽  
pp. 705-713 ◽  
Author(s):  
Luis L. Bonilla ◽  
Manuel Carretero ◽  
Filippo Terragni
Keyword(s):  
Master Equation ◽  
Blood Vessels ◽  
Transition Probabilities ◽  
Reaction Diffusion ◽  
Reaction Diffusion Equations ◽  
Birth Process ◽  
Sink Term ◽  
System Of Particles ◽  
Vessel Network ◽  
Tip Cells

AbstractWe study a system of particles in a two-dimensional geometry that move according to a reinforced random walk with transition probabilities dependent on the solutions of reaction-diffusion equations (RDEs) for the underlying fields. A birth process and a history-dependent killing process are also considered. This system models tumor-induced angiogenesis, the process of formation of blood vessels induced by a growth factor (GF) released by a tumor. Particles represent vessel tip cells, whose trajectories constitute the growing vessel network. New vessels appear and may fuse with existing ones during their evolution. Thus, the system is described by tracking the density of active tips, calculated as an ensemble average over many realizations of the stochastic process. Such density satisfies a novel discrete master equation with source and sink terms. The sink term is proportional to a space-dependent and suitably fitted killing coefficient. Results are illustrated studying two influential angiogenesis models.

scholarly journals RELAXATION OF SPHERICAL SYSTEMS WITH LONG-RANGE INTERACTIONS: A NUMERICAL INVESTIGATION

2011 ◽  
Vol 21 (08) ◽  
pp. 2279-2283 ◽  
Author(s):  
PIERFRANCESCO DI CINTIO ◽  
LUCA CIOTTI
Keyword(s):  
Long Range ◽  
Superposition Principle ◽  
Relaxation Times ◽  
Stellar Dynamics ◽  
Mixing Times ◽  
Spherical Shells ◽  
Phase Mixing ◽  
Long Range Interactions ◽  
System Of Particles ◽  
Classical Gravity

The process of relaxation of a system of particles interacting with long-range forces is relevant to many areas of physics. For obvious reasons, in Stellar Dynamics much attention has been paid to the case of r-2force law. However, recently the interest in alternative gravities has emerged, and significant differences with respect to Newtonian gravity have been found in relaxation phenomena. Here we begin to explore this matter further, by using a numerical model of spherical shells interacting with an r-αforce law obeying the superposition principle. We find that the virialization and phase-mixing times depend on the exponent α, with small values of α corresponding to longer relaxation times, similarly to what happens when comparing for N-body simulations in classical gravity and in Modified Newtonian Dynamics.

Statutory Safety Representatives and Safety Committees: Legal and Industrial Relations Implications

1982 ◽  
Vol 24 (3) ◽  
pp. 337-364 ◽  
Author(s):  
W.B. Creighton
Keyword(s):  
Industrial Relations ◽  
Health And Safety ◽  
Safety Issues ◽  
Statutory Provision ◽  
The United Kingdom ◽  
Sufficient Detail ◽  
Structured System ◽  
Safety Committees ◽  
Practical Implications

This article examines the increasingly important issue of the role of statutory safety representatives and safety committees in helping to promote and protect the health, safety and welfare of the Australian workforce. It consists first of an examination of the development of statutory provision in this area in the United Kingdom, culminating in the passing of the Health and Safety at Work Act 1974 and the introduction of the far-reaching Safety Representatives and Safety Committees Regulations of 1977. It then describes and analyses the reception of these provisions, and the philosophy which underpins them, in Australia. Thirdly, it attempts to identify and discuss some of the more important legal and practical implications of this kind of statutory provision. There is reason to suppose that some of these issues have not been analysed in sufficient detail in either Britain or Australia, but overall it is clear that a properly structured system of statutory safety representatives/com mittees can play an important and constructive part in helping to promote a proper awareness of health and safety issues in this country.

Double Scattering of Electrons with Magnetic Interaction. II. Depolarization

1955 ◽  
Vol 100 (6) ◽  
pp. 1551-1557 ◽  
Author(s):  
H. Mendlowitz ◽  
K. M. Case
Keyword(s):  
Magnetic Interaction ◽  
Double Scattering

scholarly journals Formation of a columnar liquid crystal in a simple one-component system of particles

Soft Matter ◽  
2015 ◽  
Vol 11 (23) ◽  
pp. 4606-4613 ◽  
Author(s):  
Alfredo Metere ◽  
Sten Sarman ◽  
Tomas Oppelstrup ◽  
Mikhail Dzugutov
Keyword(s):  
Molecular Dynamics ◽  
Liquid Crystal ◽  
Molecular Dynamics Simulation ◽  
Dynamics Simulation ◽  
Spherically Symmetric ◽  
Identical Particles ◽  
Component System ◽  
Symmetric Potential ◽  
System Of Particles

We report a molecular dynamics simulation demonstrating that a columnar liquid crystal, commonly formed by disc-shaped molecules, can be formed by identical particles interactingviaa spherically symmetric potential.

On the double-scattering effect from polycrystals

1977 ◽  
Vol 61 (3) ◽  
pp. 193-194 ◽  
Author(s):  
L.L. Balashova ◽  
E.S. Mashkova ◽  
V.A. Molchanov
Keyword(s):  
Double Scattering ◽  
Scattering Effect
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