5,232 research outputs found
Semantic Instance Annotation of Street Scenes by 3D to 2D Label Transfer
Semantic annotations are vital for training models for object recognition,
semantic segmentation or scene understanding. Unfortunately, pixelwise
annotation of images at very large scale is labor-intensive and only little
labeled data is available, particularly at instance level and for street
scenes. In this paper, we propose to tackle this problem by lifting the
semantic instance labeling task from 2D into 3D. Given reconstructions from
stereo or laser data, we annotate static 3D scene elements with rough bounding
primitives and develop a model which transfers this information into the image
domain. We leverage our method to obtain 2D labels for a novel suburban video
dataset which we have collected, resulting in 400k semantic and instance image
annotations. A comparison of our method to state-of-the-art label transfer
baselines reveals that 3D information enables more efficient annotation while
at the same time resulting in improved accuracy and time-coherent labels.Comment: 10 pages in Conference on Computer Vision and Pattern Recognition
(CVPR), 201
TetraÂethylÂammonium hexaÂcyanidoferrate(III) bisÂ(diaquaÂ{6,6′-dimethÂoxy-2,2′-[o-phenylÂenebis(nitriloÂmethylÂidyne)]diphenolato}manganese(III))–methanol–ethanol (1/2/2)
In the title compound, (C8H20N)[Mn(C22H18N2O4)(H2O)2][Fe(CN)6]·2CH3OH·2C2H5OH or [NEt4][Mn(3-Meosalophen)(H2O)2]2[Fe(CN)6]·2CH3OH·2C2H5OH, the asymmetric unit consists of one half of an [NEt4]+ cation disordered around a twofold axis, the [Mn(3-Meosalophen)(H2O)2]+ coordination cation, one half of a C
2 symmetric [Fe(CN)6]3− anion and disordered methanol and ethanol solvent molÂecules that are equally populated at two different sites. The MnIII atom chelated by the 3-Meosalophen ligand adopts a slightly distorted MnN2O4 octaÂhedral geometry with the coordination completed by two water molÂecules. The [Mn(3-Meosalophen)(H2O)2]+ cations, [Fe(CN)6]3- anions and solvent molÂecules are connected into a zigzag chain through hydrogen-bonding interÂactions
Dcr-1 Maintains Drosophila Ovarian Stem Cells
SummaryMicroRNAs (miRNAs) regulate gene expression by controlling the turnover, translation, or both of specific mRNAs. In Drosophila, Dicer-1 (Dcr-1) is essential for generating mature miRNAs from their corresponding precursors. Because miRNAs are known to modulate developmental events, such as cell fate determination and maintenance in many species, we investigated whether a lack of Dcr-1 would affect the maintenance of stem cells (germline stem cells, GSCs; somatic stem cells, SSCs) in the Drosophila ovary by specifically removing its function from the stem cells. Our results show that dcr-1 mutant GSCs cannot be maintained and are lost rapidly from the niche without discernable features of cell death, indicating that Dcr-1 controls GSC self-renewal but not survival. bag of marbles (bam), the gene that encodes an important differentiating factor in the Drosophila germline, however, is not upregulated in dcr-1 mutant GSCs, and its removal does not slow down dcr-1 mutant GSC loss, suggesting that Dcr-1 controls GSC self-renewal by repressing a Bam-independent differentiation pathway. Furthermore, Dcr-1 is also essential for the maintenance of SSCs in the Drosophila ovary. Our data suggest that miRNAs produced by Dcr-1 are required for maintaining two types of stem cells in the Drosophila ovary
A scanning tunneling microscopy based potentiometry technique and its application to the local sensing of the spin Hall effect
A scanning tunneling microscopy based potentiometry technique for the
measurements of the local surface electric potential is presented and
illustrated by experiments performed on current-carrying thin tungsten films.
The obtained results demonstrate a sub-millivolt resolution in the measured
surface potential. The application of this potentiometry technique to the local
sensing of the spin Hall effect is outlined and some experimental results are
reported.Comment: 9 pages and 4 figure
catena-Poly[[(3-methylÂpyridine)Âcopper(I)]-μ-cyanido-copper(I)-μ-cyanido]
In the title complex, [Cu2(CN)2(C6H7N)]n, there are two copper atoms with different coordination environments. One Cu atom (Cu1) is linked to the two cyanide ligands, one N atom from a pyridine ring while the other (Cu2) is coordinated by the two cyanide ligands in a slightly distorted tetraÂhedral geometry and linked to Cu1, forming a triangular coordination environment. The Cu atoms are bridged by bidentate cyanide ligands, forming an infinite Cu–CN chain. One cyanide ligand is equally disordered over two sets of sites, exchanging C and N atoms coordinated to both metal atoms. However, one cyanide group is not disordered and it coordinates to Cu1 via the N atom whereas its C-atom counterpart coordinates Cu2. The 3-methylÂpyridine (3MP) ligand coordinates through the N atom to Cu1 as a terminal ligand, which originates from decyanation of 3-pyridylÂacetonitrile under hydroÂthermal conditions. Adjacent Cu–CN chains are interÂconnected through Cu⋯Cu interÂactions [2.8364 (10) Å], forming a three-dimensional framework
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