background  & aim: case-crossover  studies are the case-control  version of crossover studies. in these studies, cases and controls are the same subjects. the term crossover is applied for designs that all subjects pass through both treatment (exposure) and placebo (non-exposure) phases. in fact they are  crossover  of  subjects  between  periods  of  exposure  and  non-exposure.  this  design ...

For a case-based application with a sizable case library, a common practice is to retrieve a set of cases and then reduce the set with a domain-specific similarity metric. This research investigates an alternative technique that constructs a number of two-dimensional (or multi-dimensional) indices using the principle of elaboration and specialization. By storing cases with these indices, we red...

We consider many-site mutation-recombination models of molecular evolution, where fitness is a function of a Hamming distance from one (one-dimensional case) or two (two-dimensional case) sequences. For the one-dimensional case, we calculate the population distribution dynamics for a model with zero fitness and an arbitrary symmetric initial distribution and find an error threshold transition p...

In this work, we investigate the dynamics of a non-local model describing spontaneous cell polarisation. It consists in a drift-diffusion equation set in the half-space, with the coupling involving the trace value on the boundary. We characterize the following behaviours in the one-dimensional case: solutions are global if the mass is below the critical mass and they blow-up in finite time abov...

Cystic Hygroma is a well-recognized lesion in paediatric patients but it is very rare in adults. We report here a case of Cervical Cystic Hygroma in a 45 yr old male. The reasons to present this case are 1) Its rarity in adults 2) Unusual age of presentation 3) Simulates various benign and malignant lesions at this site 4) Is a diagnostic challenge and 5) Role of histology for definitive postop...

Full-field transmission X-ray microscopy is a unique non-destructive technique for three-dimensional imaging of specimens at the nanometer scale. Here, the use of zone-doubled Fresnel zone plates to achieve a spatial resolution better than 20 nm in the hard X-ray regime (8-10 keV) is reported. By obtaining a tomographic reconstruction of a Ni/YSZ solid-oxide fuel cell, the feasibility of perfor...

Light field microscopy methods together with three-dimensional (3D) deconvolution can be used to obtain single-shot 3D images of atomic clouds. We demonstrate the method using a test setup that extracts 3D images from a fluorescent Rb87 atomic vapor.

Zusammenfassung Im Vergleich zu den traditionellen Clusteringverfahren ermöglicht Subspace Clustering die Suche nach Clustern in den Unterräumen (Subspaces) der Daten. Man unterscheidet zwei Hauptarten des Subspace-Clustering-Verfahrens: Top-Downund Bottom-Up-Verfahren. Die Algorithmen des Top-Down-Verfahrens verkleinern die Suchbereiche von hohen zu niedrigen Dimensionen. In dem Bottom-Up-Verf...

We demonstrate a simple approach for inline holographic coherent anti-Stokes Raman scattering (CARS) microscopy, in which a layer of uniform nonlinear medium is placed in front of a specimen to be imaged. The reference wave created by four-wave mixing in the nonlinear medium can interfere with the CARS signal generated in the specimen to result in an inline hologram. We experimentally and theor...

Classical logic and more precisely classical sequent calculi are currently the subject of several studies that aim at providing them with an algorithmic meaning. They are however ruled by an annoying syntactic bureaucracy which is a cause of pathologic non-confluence. An interesting patch consists in representing proofs using proofnets. This leads (at least in the propositional case) to cut-eli...