23,438 research outputs found
Heterogeneous Batch Distillation Processes: Real System Optimisation
In this paper, optimisation of batch distillation processes is considered. It deals with real systems with rigorous simulation of the processes through the resolution full MESH differential algebraic equations. Specific software architecture is developed, based on the BatchColumn® simulator and on both SQP and GA numerical algorithms, and is able to optimise sequential batch columns as long as the column transitions are set.
The efficiency of the proposed optimisation tool is illustrated by two case studies. The first one concerns heterogeneous batch solvent recovery in a single distillation column and shows that significant economical gains are obtained along with improved process conditions. Case two concerns the optimisation of two sequential homogeneous batch distillation columns and demonstrates the capacity to optimize several sequential dynamic different processes. For such multiobjective complex problems, GA is preferred to SQP that is able to improve specific GA solutions
Development of ultra-light pixelated ladders for an ILC vertex detector
The development of ultra-light pixelated ladders is motivated by the
requirements of the ILD vertex detector at ILC. This paper summarizes three
projects related to system integration. The PLUME project tackles the issue of
assembling double-sided ladders. The SERWIETE project deals with a more
innovative concept and consists in making single-sided unsupported ladders
embedded in an extra thin plastic enveloppe. AIDA, the last project, aims at
building a framework reproducing the experimental running conditions where sets
of ladders could be tested
Rydberg wavepackets in terms of hidden-variables: de Broglie-Bohm trajectories
The dynamics of highly excited radial Rydberg wavepackets is analyzed in
terms of de Broglie-Bohm (BB) trajectories. Although the wavepacket evolves
along classical motion, the computed BB trajectories are markedly different
from the classical dynamics: in particular none of the trajectories initially
near the atomic core reach the outer turning point where the wavepacket
localizes periodically. The reasons for this behavior, that we suggest to be
generic for trajectory-based hidden variable theories, are discussed.Comment: 12 pages, 4 fig
Coupling a single Nitrogen-Vacancy center to a superconducting flux qubit in the far off resonance regime
We present a theoretical proposal to couple a single Nitrogen-Vacancy (NV)
center to a superconducting flux qubit (FQ) in the regime where both systems
are off resonance. The coupling between both quantum devices is achieved
through the strong driving of the flux qubit by a classical microwave field
that creates dressed states with an experimentally controlled characteristic
frequency. We discuss several applications such as controlling the NV center's
state by manipulation of the flux qubit, performing the NV center full
tomography and using the NV center as a quantum memory. The effect of
decoherence and its consequences to the proposed applications are also
analyzed. Our results provide a theoretical framework describing a promising
hybrid system for quantum information processing, which combines the advantages
of fast manipulation and long coherence times.Comment: 8 pages, 9 figure
Merging massive black holes: the right place and the right time
The LIGO/Virgo detections of gravitational waves from merging black holes of
30 solar mass suggest progenitor stars of low metallicity
(Z/Z). In this talk I will provide constrains on where
the progenitors of GW150914 and GW170104 may have formed, based on advanced
models of galaxy formation and evolution combined with binary population
synthesis models. First I will combine estimates of galaxy properties
(star-forming gas metallicity, star formation rate and merger rate) across
cosmic time to predict the low redshift BBH merger rate as a function of
present day host galaxy mass, formation redshift of the progenitor system and
different progenitor metallicities. I will show that the signal is dominated by
binaries formed at the peak of star formation in massive galaxies with and
binaries formed recently in dwarf galaxies. Then, I will present what very high
resolution hydrodynamic simulations of different galaxy types can learn us
about their black hole populations.Comment: Proceeding of IAU Symposium 338 : "Gravitational Waves Astrophysics :
Early results from GW searches and EM counterparts
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