874 research outputs found
Grob aircraft construction: The G 110 flies
Description, specifications and test flight performance of the G 110 are provided. The G 110 completely incorporates modern GfK construction techniques which heretofore have been developed and perfected for the construction of sailplanes. The G 110 is a prototype of a GfK constructed motorized aircraft and shows much promise for the future of German aviation
Frequency Analysis of Gradient Estimators in Volume Rendering
Gradient information is used in volume rendering to classify and color samples along a ray. In this paper, we present an analysis of the theoretically ideal gradient estimator and compare it to some commonly used gradient estimators. A new method is presented to calculate the gradient at arbitrary sample positions, using the derivative of the interpolation filter as the basis for the new gradient filter. As an example, we will discuss the use of the derivative of the cubic spline. Comparisons with several other methods are demonstrated. Computational efficiency can be realized since parts of the interpolation computation can be leveraged in the gradient estimatio
Socata: TB 20 Trinidad given German debut
Pilot impressions gained in a first flight in the 250 HP single engine TB 20 prototype aircraft are presented along with aircraft specifications
Indigenous and institutional profile: Limpopo River Basin
River basins / Water resource management / History / Institutions / Social aspects / Legal aspects
Generalized Voxel Coloring
Image-based reconstruction from randomly scattered views is a challenging problem. We present a new algorithm that extends Seitz and Dyer’s Voxel Coloring algorithm. Unlike their algorithm, ours can use images from arbitrary camera locations. The key problem in this class of algorithms is that of identifying the images from which a voxel is visible. Unlike Kutulakos and Seitz’s Space Carving technique, our algorithm solves this problem exactly and the resulting reconstructions yield better results in our application, which is synthesizing new views. One variation of our algorithm minimizes color consistency comparisons; another uses less memory and can be accelerated with graphics hardware. We present efficiency measurements and, for comparison, we present images synthesized using our algorithm and Space Carving
Volumetric Warping for Voxel Coloring on an Infinite Domain
Starting with a set of calibrated photographs taken of a scene, voxel coloring algorithms reconstruct three-dimensional surface models on a finite spatial domain. In this paper, we present a method that warps the voxel space, so that the domain of the reconstruction extends to an infinite or semi-infinite volume. Doing so enables the reconstruction of objects far away from the cameras, as well as reconstruction of a background environment. New views synthesized using the warped voxel space have improved photo-realism
New Reflection Transformation Imaging Methods for Rock Art and Multiple-Viewpoint Display
info:eu-repo/semantics/publishedVersio
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Conditional Knockout of Crhr2 in Serotonergic Neurons Decreases the Expression of slc6a4 mRNA in the Ventral Dorsal Raphe Nucleus
Exposure to stressors triggers the release of corticotropin-releasing hormone (Crh), which mediates the physiological and behavioral stress response through activation of corticotropin-releasing hormone receptor type-1 and 2 (CRHR2). Crhr2 is a G protein-coupled-receptor found on the surface of cells across the brain, including serotonergic neurons in the dorsal raphe nucleus (DRN). Studies performing global knockout of Crhr2 show anxiolytic effects, but cannot attribute these effects to changes in Crh signaling in specific neural systems. This study utilized a Pet1-driven Cre-mediated knockout of Crhr2 from serotonergic neurons to elucidate the effects of Crh signaling on serotonergic neurons in the DRN. To measure the impact of deletion of Crhr2 in serotonergic neurons on genes that are important modulators of serotonergic signaling, we measured mRNA expression levels of serotonin transporter gene slc6a4. Using in situ hybridization histochemistry we analyzed slc6a4 mRNA expression across subregions of the DRN and median raphe nucleus. We found a localized decrease in the expression levels of slc6a4 mRNA in the mid-rostrocaudal region of the ventral dorsal raphe nucleus (DRV). A decrease in slc6a4 mRNA, if representative of levels of serotonin transporter protein expression and trafficking to the plasma membrane, would suggest an increase in the serotonergic signaling of brain regions innervated by this population of neurons. Crhr2 primarily has an excitatory role in neuronal signaling and deletion of Crhr2 would remove an important excitatory input to these neurons. Decreased slc6a4 mRNA expression could implicate a possible compensatory role for the loss of excitatory Crhr2 in the mid-rostrocaudal DRV
Photo repair and 3d structure from flatbed scanners
We introduce a technique that allows 3D information to be captured from a conventional flatbed scanner. The technique requires no hardware modification and allows untrained users to easily capture 3D datasets. Once captured, these datasets can be used for interactive relighting and enhancement of surface detail on physical objects. We have also found that the method can be used to scan and repair damaged photographs. Since the only 3D structure on these photographs will typically be surface tears and creases, our method provides an accurate procedure for automatically detecting these flaws without any user intervention. Once detected, automatic techniques, such as infilling and texture synthesis, can be leveraged to seamlessly repair such damaged areas. We first present a method that is able to repair damaged photographs with minimal user interaction and then show how we can achieve similar results using a fully automatic process
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