2,064 research outputs found
A compact, multi-pixel parametric light source
The features of a compact, single pass, multi-pixel optical parametric
generator are discussed. Several hundreds of independent high spatial-quality
tunable ultrashort pulses were produced by pumping a bulk lithium triborate
crystal with an array of tightly focussed intense beams. The array of beams was
produced by shining a microlenses array with a large pump beam. Overall
conversion efficiency to signal and idler up to 30% of the pump beam has been
reported. Shot-to-shot energy fluctuation down to 3% was achieved for the
generated radiation.Comment: 11 pages, 6 figures, submitted to "Optics Communications
Bounded elements of C*-inductive locally convex spaces
The notion of bounded element of C*-inductive locally convex spaces (or
C*-inductive partial *-algebras) is introduced and discussed in two ways: the
first one takes into account the inductive structure provided by certain
families of C*-algebras; the second one is linked to natural order of these
spaces. A particular attention is devoted to the relevant instance provided by
the space of continuous linear maps acting in a rigged Hilbert space
Operators in Rigged Hilbert spaces: some spectral properties
A notion of resolvent set for an operator acting in a rigged Hilbert space
\D \subset \H\subset \D^\times is proposed. This set depends on a family of
intermediate locally convex spaces living between \D and \D^\times, called
interspaces. Some properties of the resolvent set and of the corresponding
multivalued resolvent function are derived and some examples are discussed.Comment: 29 page
Kurt Smith, Matter Matters
La recensione descrive i passaggi cardine tramite i quali l'autore ricostruisce il problema del rapporto materia-matematica in Descartes e Leibniz
Markus Gabriel, Il senso dell'esistenza.
La recensione si configura nei termini di una presentazione critica dei nuclei tematici centrali del testo di Markus Gabriel, ed \ue8 essenzialmente orientata all'individuazione dei passaggi fondamentali attraverso i quali l'autore delinea il profilo teorico del nuovo realismo. Nello specifico, la recensione mette in rilievo le modalit\ue0 attraverso le quali l'autore esibisce le caratteristiche strutturali del dispositivo ontologico su cui si basa la proposta teorica neo-realista
Experimental observation of the X-shaped near field spatio-temporal correlation of ultra-broadband twin beams
In this work we present the experimental observation of the non factorable
near field spatio-temporal correlation of ultra-broadband twin beams generated
by parametric down conversion (PDC), in an interferometric-type experiment
using sum frequency generation, where both the temporal and spatial degrees of
freedom of PDC light are controlled with very high resolution. The revealed
X-structure of the correlation is in accordance with the predictions of the
theory.Comment: 5 pages, 3 figure
Space-time coupling in the up-conversion of broadband down-converted light
We investigate the up-conversion process of broadband light from parametric
down-conversion (PDC), focusing on the spatio-temporal spectral properties of
the sum-frequency generated (SFG) radiation. We demonstrate that the incoherent
component of the SFG spectrum is characterized by a skewed geometry in
space-time, which originates from a compensation between the group-velocity
mismatch and the spatial walk-off of the fundamental and the SFG fields. The
results are illustrated both by a theoretical modeling of the optical system
and by experimental measurements.Comment: 11 pages, 9 figures. arXiv admin note: text overlap with
arXiv:1308.236
A Real-time Strategy Agent Framework and Strategy Classifier for Computer Generated Forces
This research effort is concerned with the advancement of computer generated forces AI for Department of Defense (DoD) military training and education. The vision of this work is agents capable of perceiving and intelligently responding to opponent strategies in real-time. Our research goal is to lay the foundations for such an agent. Six research objectives are defined: 1) Formulate a strategy definition schema effective in defining a range of RTS strategies. 2) Create eight strategy definitions via the schema. 3) Design a real-time agent framework that plays the game according to the given strategy definition. 4) Generate an RTS data set. 5) Create an accurate and fast executing strategy classifier. 6) Find the best counterstrategies for each strategy definition. The agent framework is used to play the eight strategies against each other and generate a data set of game observations. To classify the data, we first perform feature reduction using principal component analysis or linear discriminant analysis. Two classifier techniques are employed, k-means clustering with k-nearest neighbor and support vector machine. The resulting classifier is 94.1% accurate with an average classification execution speed of 7.14 us. Our research effort has successfully laid the foundations for a dynamic strategy agent
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