603 research outputs found
Proposal for a new Electrical Supply of the Computer Centre for LHC
To handle the future LHC experiment needs, the Computer Centre will go through a complete change of data processing methods. A total of five Computing farms will be built covering an area of 2,000 m2. The electrical power required for the new Computing farms will increase by five fold to 2 MW. This will have major impact on the technical infrastructures. Focusing on electrical issues, this paper initially explains the principle of the present electrical supply and the major drawbacks. Taking advantage of the opportunity offered by these big changes and conclusions drawn from the recent ST/EL reports, the strategy of electrical supply of building 513 is reviewed, in particular the Diesel backup supply. On this basis and benchmarking with similar Computer Centres, a proposal for a new electrical supply is presented, the objectives being to meet the increase in demand, reliability and safe operation of the Computer Centre
Explaining the Evolution of Domestic Nanotechnology Companies - Survival Patterns of a Young and Emerging Technology
Nanotechnology (NT) is often considered to be the essential technology of the future. Since the economy shapes the competiveness of a country to a great extent, factors fostering or hindering the evolution of NT companies need to be disentangled. This thesis associates the evolution of domestic NT companies to several kinds of knowledge. It provides an empirical investigation using an industry-dynamic and a network-theoretic approach
Stabilization methods in relaxed micromagnetism
The magnetization of a ferromagnetic sample solves a
non-convex variational problem, where its relaxation by convexifying
the energy density resolves relevant
macroscopic information.
The numerical analysis of the relaxed model
has to deal with a constrained convex
but degenerated, nonlocal energy functional in mixed formulation for
magnetic potential u and magnetization m.
In [C. Carstensen and A. Prohl, Numer. Math. 90
(2001) 65–99], the conforming P1 - (P0)d-element in d=2,3 spatial
dimensions is shown to lead to
an ill-posed discrete problem in relaxed micromagnetism, and suboptimal
convergence.
This observation motivated a
non-conforming finite element method which leads to
a well-posed discrete problem, with solutions converging at
optimal rate.
In this work, we provide both an a priori and a posteriori error analysis for two
stabilized conforming methods which account for inter-element jumps of the
piecewise constant magnetization.
Both methods converge at optimal rate;
the new approach is applied to a macroscopic nonstationary
ferromagnetic model [M. KruĹľĂk and A. Prohl, Adv. Math. Sci. Appl. 14 (2004) 665–681 – M. KruĹľĂk and T. RoubĂÄŤek, Z. Angew. Math. Phys. 55 (2004) 159–182 ]
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