387 research outputs found
Effect of wind turbine generator model and siting on wind power changes out of large WECS arrays
Methods of reducing the WECS generation change through selection of the wind turbine model for each site, selection of an appropriate siting configuration, and wind array controls are discussed. An analysis of wind generation change from an echelon and a farm for passage of a thunderstorm is presented. Reduction of the wind generation change over ten minutes is shown to reduce the increase in spinning reserve, unloadable generation and load following requirements on unit commitment when significant WECS generation is present and the farm penetration constraint is satisfied. Controls on the blade pitch angle of all wind turbines in an array or a battery control are shown to reduce both the wind generation change out of an array and the effective farm penetration in anticipation of a storm so that the farm penetration constraint may be satisfied
A study of order based genetic and evolutionary algorithms in combinatorial optimization problems
In Genetic and Evolutionary Algorithms (GEAs) one is faced with a given number of parameters, whose possible values are coded in a binary alphabet. With Order Based Representations (OBRs) the genetic information is kept by the order of the genes and not by its value. The application of OBRs to the Traveling Salesman Problem (TSP) is a well known technique to the GEA community. In this work one intends to show that this coding scheme can be used as an indirect representation, where the chromosome is the input for the decoder. The behavior of the GEA's operators is compared under benchmarks taken from the Combinatorial Optimization arena.(undefined
Calorimetric Measurements of Magnetic-Field-Induced Inhomogeneous Superconductivity Above The Paramagnetic Limit
We report the first magneto-caloric and calorimetric observations of a
magnetic-field-induced phase transition within a superconducting state to the
long-sought exotic "FFLO" superconducting state first predicted over 50 years
ago. Through the combination of bulk thermodynamic calorimetric and
magnetocaloric measurements in the organic superconductor -
(BEDT-TTF)Cu(NCS), as a function of temperature, magnetic field
strength, and magnetic field orientation, we establish for the first time that
this field-induced first-order phase transition at the paramagnetic limit
for traditional superconductivity is to a higher entropy superconducting phase
uniquely characteristic of the FFLO state. We also establish that this
high-field superconducting state displays the bulk paramagnetic ordering of
spin domains required of the FFLO state. These results rule out the alternate
possibility of spin-density wave (SDW) ordering in the high field
superconducting phase. The phase diagram determined from our measurements ---
including the observation of a phase transition into the FFLO phase at
--- is in good agreement with recent NMR results and our own earlier
tunnel-diode magnetic penetration depth experiments, but is in disagreement
with the only previous calorimetric report.Comment: 5 pages, 5 figure
Studie ĂĽber Lean Management und Industrie 4.0 in der Weser-Ems-Region sowie Handlungsbedarf
Industrie 4.0 ist das Zukunftsprojekt und wird die Industrie neu organisieren. Demenentsprechend ist Industrie 4.0 und die damit einhergehende Digitalisierung das Thema in den Unternehmen, oder nicht? In der Studie haben 75 Unternehmen aus dem Weser-Ems-Regierungsbezirk an der Umfrage zum Thema des Status von Lean Management und Industrie 4.0 im eigenen Unternehmen teilgenommen. Befragt wurden primär kleine und mittlere Unternehmen. Die Fragen handelten von Lean Management und Industrie 4.0 und beinhalteten die Themenbereiche
-Kenntnisstand bei Mitarbeitern und Führungskräften
-Status bereits initiierter bzw. geplanter Aktivitäten.
Die Befragungsergebnisse werden vorgestellt und es wird der in der Studie ermittelte Handlungsbedarf aufgezeigt und Unterstützungsmöglichkeiten beschrieben, die die Hochschulen leisten können
On Meme Self-Adaptation in Spatially-Structured Multimemetic Algorithms
NMA 2014Multimemetic algorithms (MMAs) are memetic algorithms that explicitly exploit the evolution of memes, i.e., non-genetic expressions of problem-solving strategies. We consider a class of MMAs in which these memes are rewriting rules whose length can be fixed during the run of the algorithm or self-adapt during the search process. We analyze this self-adaptation in the context of spatially-structured MMAs, namely MMAs in which the population is endowed with a certain topology to which interactions (from the point of view of selection and variation operators) are constrained. For the problems considered, it is shown that panmictic (i.e., non-structured) MMAs are more sensitive to this self-adaptation, and that using variable-length memes seems to be a robust strategy throughout different population structures.This work is partially supported by MICINN project ANYSELF (TIN2011-28627-C04-01), by
Junta de AndaluĂa project DNEMESIS (P10-TIC-6083) and by Universidad de Málaga, Campus de Excelencia Internacional AndalucĂa Tech
- …