5,931 research outputs found
Imprinting interference fringes in massive optomechanical systems
An interferometric scheme for the creation of momentum superposition states
of mechanical oscillators, using a quantum mirror kicked by free photons is
analyzed. The scheme features ultra-fast preparation with immediate detection
and should allow for the observation of signatures of momentum superpositions
in a massive macroscopic system at non-zero temperatures. It is robust against
thermalized initial states, displacement and movement, mirror imperfections,
and the measurements' back-actions.Comment: 4 pages, 3 figures, 7 subfigure
Maintaining the Regular Ultra Passum Law in data envelopment analysis
The variable returns to scale data envelopment analysis (DEA) model is developed with a maintained hypothesis of convexity in input-output space. This hypothesis is not consistent with standard microeconomic production theory that posits an S-shape for the production frontier, i.e. for production technologies that obey the Regular Ultra Passum Law. Consequently, measures of technical efficiency assuming convexity are biased downward. In this paper, we provide a more general DEA model that allows the S-shape.Data envelopment analysis; homothetic production; S-shaped production function; non-convex production set
Testing over-representation of observations in subsets of a DEA technology
This paper proposes a test for whether data are over-represented in a given production zone, i.e. a subset of a production possibility set which has been estimated using the non-parametric Data Envelopment Analysis (DEA) approach. A binomial test is used that relates the number of observations inside such a zone to a discrete probability weighted relative volume of that zone. A Monte Carlo simulation illustrates the performance of the proposed test statistic and suggests good estimation of both facet probabilities and the assumed common inefficiency distribution in a three dimensional input space.Data Envelopment Analysis (DEA); Over-representation; Data density; Binomial test; Convex hull
European Metroscapes:the production of lived mobilities within the socio-technical Metro systems in Copenhagen, London and Paris
Networked Mobilities and Performative Urban Environments:Keynote paper for the Conference Space Interaction Discourse
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