6 research outputs found

    Collinder 135 and UBC 7: A Physical Pair of Open Clusters

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    Given the closeness of the two open clusters Cr 135 and UBC 7 on the sky, we investigate the possibility of the two clusters to be physically related. We aim to recover the present-day stellar membership in the open clusters Collinder 135 and UBC 7 (300 pc from the Sun), to constrain their kinematic parameters, ages and masses, and to restore their primordial phase space configuration. The most reliable cluster members are selected with our traditional method modified for the use of Gaia DR2 data. Numerical simulations use the integration of cluster trajectories backwards in time with our original high order Hermite4 code \PGRAPE. We constrain the age, spatial coordinates and velocities, radii and masses of the clusters. We estimate the actual separation of the cluster centres equal to 24 pc. The orbital integration shows that the clusters were much closer in the past if their current line-of-sight velocities are very similar and the total mass is more than 7 times larger the mass of the determined most reliable members. We conclude that the two clusters Cr 135 and UBC 7 might very well have formed a physial pair, based on the observational evidence as well as numerical simulations. The probability of a chance coincidence is only about 2%2\%.Comment: Accepted for publication as a Letter in Astronomy and Astrophysics. 5 pages, 2 figure

    Characteristics of the Western European ecological group barley varieties in the North-Western region of the Russian Federation

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    In the North-West region, spring barley is the main grain fodder crop. The variety is an effective and most affordable means of increasing the harvest and quality of the grain. The studying selection material for breeding ensures success in the creation of new varieties. European varieties are characterized by resistance to powdery mildew, which is a limiting factor of breeding in the North-West region. This work aimed to find new sources of agrobiological valuable traits. In 2016-2018, which differed in weather conditions, 32 varieties of spring barley were studied on the field of the Pushkin Laboratory of VIR. As a result of studying a set of samples of the Western European ecological group, according to the main agrobiological valuable traits sources for breeding in the North-West region were identified: early maturing, semi-dwarf, large-grain variety – “Brucefield” (к-31555, parallelum, Germany); semi-dwarf, large-grain variety – “Brennus” (к-31331, nutans, France); middle-maturity, high-yielding, large-grain, semi-dwarf, resistant to lodging, with an adaptation coefficient more than 1 – “Niagara” (к-31334, nutans, France), “Tocada” (к-31341, deficiens, Germany), “Juhata” (к-31346, nutans, Germany), “KWS Alciana” (к-31348, nutans, Germany)

    Does "one-size-fits-all" fit Russia? The peculiarities of CSR strategy adaptation by MNEs’ subdivisions

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    Masteroppgave i Sustainable management - Universitetet i Nordland, 201

    Deep Semantic Segmentation of Angiogenesis Images

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    Angiogenesis is the development of new blood vessels from pre-existing ones. It is a complex multifaceted process that is essential for the adequate functioning of human organisms. The investigation of angiogenesis is conducted using various methods. One of the most popular and most serviceable of these methods in vitro is the short-term culture of endothelial cells on Matrigel. However, a significant disadvantage of this method is the manual analysis of a large number of microphotographs. In this regard, it is necessary to develop a technique for automating the annotation of images of capillary-like structures. Despite the increasing use of deep learning in biomedical image analysis, as far as we know, there still has not been a study on the application of this method to angiogenesis images. To the best of our knowledge, this article demonstrates the first tool based on a convolutional Unet++ encoder–decoder architecture for the semantic segmentation of in vitro angiogenesis simulation images followed by the resulting mask postprocessing for data analysis by experts. The first annotated dataset in this field, AngioCells, is also being made publicly available. To create this dataset, participants were recruited into a markup group, an annotation protocol was developed, and an interparticipant agreement study was carried out
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