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Abstract

European whitefish ( Coregonus lavaretus) is a highly polymorphic species, but the wider scale diversity and distribution of sympatric morphs in subarctic lakes of northwestern Russia has not been recently studied and analyzed. The aim of the present study was to investigate diversity and distribution of whitefish morphs in different sized lakes and watercourses of Murmansk region. Our study of the water bodies in four major river basins of Murmansk region revealed the presence of two whitefish morphs: sparsely rakered (further sr) and medium rakered ( mr). The mr morph is less common and observed only alongside the sr whitefish. In general, in sr whitefish the number of gill rakers ranges between 15 and 31, and in mr whitefish between 27 and 44. Among whitefishes with 27 to 31 gill rakers, both sr and mr morphs were observed and distinguishable by the shape of the rakers. In the studied sr whitefish populations, relatively long and short rakered whitefish morphs were found. In Lake Kuetsyarvi (Pasvik River basin), the sr and mr whitefish formed additional slow- and fastgrowing ecological morphs. The four whitefish morphs in Lake Kuetsyarvi specialize to different ecological niches correlating with morphological and behavioral differences. The observed diversity and distribution of whitefish in the Murmansk region requires genetic studies of the population to assess the origins of divergence.
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Authors and Affiliations

Elena Mikhailovna Zubova
1
Nikolay Alexandrovich Kashulin
1
Petr Mikhailovich Terentjev
1
Alexey Valerievich Melekhin
2

  1. Aquatic Ecosystems Laboratory at the Institute of Industrial Ecology of the North, Kola Scientific Center, Russian Academy of Sciences, Akademgorodok 14a, 184209 Apatity, Murmansk region, Russia
  2. Flora and Vegetation Laboratory at the Polar-Alpine Botanical Garden-Institute, Kola Science Center, Russian Academy of Sciences, Akademgorodok 18a, 184209 Apatity, Murmansk region, Russia
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Abstract

The article presents experiments in realistic modelling of facial expressions using volume morphing. The experiments use a variable number of points and face features. As the results are shown meshes deviations (between goal mesh and morphed shape). Experiments have shown that it is impossible to carry out a fully realistic morphing based on existing software. At the same time, even imperfect morphing allows you to show the expected emotional facial expression.

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Authors and Affiliations

Przemysław Kowalski
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Abstract

The use of virtual reality (VR) has been exponentially increasing and due to that many researchers have started to work on developing new VR based social media. For this purpose it is important to have an avatar of the user which look like them to be easily generated by the devices which are accessible, such as mobile phones. In this paper, we propose a novel method of recreating a 3D human face model captured with a phone camera image or video data. The method focuses more on model shape than texture in order to make the face recognizable. We detect 68 facial feature points and use them to separate a face into four regions. For each area the best fitting models are found and are further morphed combined to find the best fitting models for each area. These are then combined and further morphed in order to restore the original facial proportions. We also present a method of texturing the resulting model, where the aforementioned feature points are used to generate a texture for the resulting model.

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Authors and Affiliations

G. Anbarjafari
R.E. Haamer
I. Lüsi
T. Tikk
L. Valgma
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Abstract

The paper presents results of tests carried out on ausferrite carbide matrix alloyed ductile cast iron. The ausferrite was obtained via addition of Cu and Mo alloying elements. This eliminated heat treatment from the alloy production cycle. The article presents results of tests of the quality of the obtained material. Emphasis was put on metallographic analysis using light and scanning microscopy. Works also included chemical composition tests and EDS analysis. Strength tests were executed in an accredited laboratory. It is possible to create a raw ausferrite carbide matrix without subjecting an alloy to heat treatment. However, it turned out that quality parameters of cast iron were insufficient. The obtained material hardness was 515 HB, while Rm strength and A5 ductility were very low. The low tensile strength of the analyzed alloy resulted from the presence of degenerate graphite secretion (of flake or vermicular shape) in the cast iron. The tests also demonstrated that the alloy was prone to shrinkage-related porosity, which further weakened the material. Alloys made of alloyed ductile iron of ausferrite matrix micro-structure are very attractive due to elimination of the heat treatment process. However, their production process and chemical composition must be optimized.
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Authors and Affiliations

M. Stawarz
1
ORCID: ORCID
M. Lenert
1
K. Piasecki
1
ORCID: ORCID

  1. Department of Foundry Engineering, Silesian University of Technology, Towarowa 7 St., 44-100 Gliwice, Poland

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