1,385 research outputs found
Development value chains meet business supply chains: the concept of global value chains unraveled
The Astrophysical Multipurpose Software Environment
We present the open source Astrophysical Multi-purpose Software Environment
(AMUSE, www.amusecode.org), a component library for performing astrophysical
simulations involving different physical domains and scales. It couples
existing codes within a Python framework based on a communication layer using
MPI. The interfaces are standardized for each domain and their implementation
based on MPI guarantees that the whole framework is well-suited for distributed
computation. It includes facilities for unit handling and data storage.
Currently it includes codes for gravitational dynamics, stellar evolution,
hydrodynamics and radiative transfer. Within each domain the interfaces to the
codes are as similar as possible. We describe the design and implementation of
AMUSE, as well as the main components and community codes currently supported
and we discuss the code interactions facilitated by the framework.
Additionally, we demonstrate how AMUSE can be used to resolve complex
astrophysical problems by presenting example applications.Comment: 23 pages, 25 figures, accepted for A&
De korte reis der B.I.L. naar Parijs!
Het komende jaar werkt de Buitenlandcommissie B.I.L.-Voyage 2012-2013 hard om twee fantasti sche reizen neer te zett en: een korte en een lange reis. De lange reis zal plaatsvinden aan het einde van het jaar, de korte reis was afgelopen maand januari naar Parijs. Hier kun je teruglezen hoe deze verlopen is
On Calculation of Thermal Conductivity from Einstein Relation in Equilibrium MD
In equilibrium molecular dynamics, Einstein relation can be used to calculate
the thermal conductivity. This method is equivalent to Green-Kubo relation and
it does not require a derivation of an analytical form for the heat current.
However, it is not commonly used as Green-Kubo relationship. Its wide use is
hindered by the lack of a proper definition for integrated heat current (energy
moment) under periodic boundary conditions. In this paper, we developed an
appropriate definition for integrated heat current to calculate thermal
conductivity of solids under periodic conditions. We applied this method to
solid argon and silicon based systems; compared and contrasted with the
Green-Kubo approach.Comment: We updated this manuscript from second version by changing the title
and abstract. This paper is submitted to J. Chem. Phy
The State of the Partnerships Report 2015; Civil Society Organisations (CSO) Under Siege - can partnerships provide new venues?
Development Value Chains meet Business Supply Chains
Value chain promotion is considered a key element of private sector development strategies and pro-poor growth. However, (value) chain concepts are rather complex and unclear.
This paper unravels the concept of global value chains and studies the diversity of key value chain-related (supply chain, commodity chain, value chain) approaches. To this aim, we reviewed academic literature and donor agencies’ reports, and consulted a limited number of key informants of donor agencies. This paper distinguishes between the strategic management perspective and the development perspective and reviews added values and limitati ons of each approach. The results suggest that practioners use an eclectic approach towards the value chain concept, although the concept originates from clearly distinctive paths and could be susceptible to miscommunication and misuse. The authors avoid misunderstanding by explicitly opting for a public and pro-poor perspective of the concept of the Global Value Chain
The State of the Partnerships Report 2015; Civil Society Organisations (CSO) Under Siege - can partnerships provide new venues?
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