Many migratory species have shifted their geographic distribution in response to climate change, yet the underlying mechanisms are poorly understood, particularly for mammals. We hypothesized that ...generational shifts are underlying the observed colonization of hibernation sites further north in a migratory bat, the common noctule (
. To evaluate our hypothesis, we collected long-term data on the migratory status and demography of common noctules in a recently colonized hibernation area. Based on isotopic data of 413 individuals, we observed a significant decline in the proportion of long-distance migrants from 2004 to 2015 for both sexes and across all age groups. Demographic data collected between 2007 and 2016 from 3394 individuals demonstrated that subadult males were more abundant during the early colonization stage, followed by a gradual shift to a more balanced age and sex composition. Our results suggest that the colonization of hibernacula at higher latitudes is promoted by generational shifts, involving mostly first-year males. Generational shifts seem to be a likely mechanism for distribution changes in other bats and potentially also in other mammals.
Context. VX Sgr is a cool, evolved, and luminous red star whose stellar parameters are difficult to determine, which affects its classification.
Aims. We aim to spatially resolve the photospheric ...extent as well as the circumstellar environment.
Methods. We used interferometric observations obtained with the MATISSE instrument in the L (3–4 μm), M (4.5–5 μm), and N (8–13 μm) bands. We reconstructed monochromatic images using the MIRA software. We used 3D radiation-hydrodynamics simulations carried out with CO5BOLD and a uniform disc model to estimate the apparent diameter and interpret the stellar surface structures. Moreover, we employed the radiative transfer codes OPTIM3D and RADMC3D to compute the spectral energy distribution for the L, M, and N bands, respectively.
Results. MATISSE observations unveil, for the first time, the morphology of VX Sgr across the L, M, and N bands. The reconstructed images show a complex morphology with brighter areas whose characteristics depend on the wavelength probed. We measured the angular diameter as a function of the wavelength and showed that the photospheric extent in the L and M bands depends on the opacity through the atmosphere. In addition to this, we also concluded that the observed photospheric inhomogeneities can be interpreted as convection-related surface structures. The comparison in the N band yielded a qualitative agreement between the N-band spectrum and simple dust radiative transfer simulations. However, it is not possible to firmly conclude on the interpretation of the current data because of the difficulty in constraing the model parameters using the limited accuracy of our absolute flux calibration.
Conclusions. MATISSE observations and the derived reconstructed images unveil the appearance of VX Sgr’s stellar surface and circumstellar environment across a very large spectral domain for the first time.
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Context.
Asymptotic giant branch (AGB) stars are cool luminous evolved stars that are well observable across the Galaxy and populating
Gaia
data. They have complex stellar surface dynamics, which ...amplifies the uncertainties on stellar parameters and distances.
Aims.
On the AGB star CL Lac, it has been shown that the convection-related variability accounts for a substantial part of the
Gaia
DR2 parallax error. We observed this star with the MIRC-X beam combiner installed at the CHARA interferometer to detect the presence of stellar surface inhomogeneities.
Methods.
We performed the reconstruction of aperture synthesis images from the interferometric observations at different wavelengths. Then, we used 3D radiative hydrodynamics (RHD) simulations of stellar convection with CO5BOLD and the post-processing radiative transfer code O
PTIM
3D to compute intensity maps in the spectral channels of MIRC-X observations. Then, we determined the stellar radius using the average 3D intensity profile and, finally, compared the 3D synthetic maps to the reconstructed ones focusing on matching the intensity contrast, the morphology of stellar surface structures, and the photocentre position at two different spectral channels, 1.52 and 1.70
μ
m, simultaneously.
Results.
We measured the apparent diameter of CL Lac at two wavelengths (3.299 ± 0.005 mas and 3.053 ± 0.006 mas at 1.52 and 1.70
μ
m, respectively) and recovered the radius (
R
= 307 ± 41 and
R
= 284 ± 38
R
⊙
) using a
Gaia
parallax. In addition to this, the reconstructed images are characterised by the presence of a brighter area that largely affects the position of the photocentre. The comparison with 3D simulation shows good agreement with the observations both in terms of contrast and surface structure morphology, meaning that our model is adequate for explaining the observed inhomogenities.
Conclusions.
This work confirms the presence of convection-related surface structures on an AGB star of
Gaia
DR2. Our result will help us to take a step forward in exploiting
Gaia
measurement uncertainties to extract the fundamental properties of AGB stars using appropriate RHD simulations.
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Context. Cool giant and supergiant star atmospheres are characterized by complex velocity fields originating from convection and pulsation processes which are not fully understood yet. The velocity ...fields impact the formation of spectral lines, which thus contain information on the dynamics of stellar atmospheres. Aim. The tomographic method allows to recover the distribution of the component of the velocity field projected on the line of sight at different optical depths in the stellar atmosphere. The computation of the contribution function to the line depression aims at correctly identifying the depth of formation of spectral lines in order to construct numerical masks probing spectral lines forming at different optical depths. Methods. The tomographic method is applied to one-dimensional (1D) model atmospheres and to a realistic three-dimensional (3D) radiative hydrodynamics simulation performed with CO5BOLD in order to compare their spectral line formation depths and velocity fields. Results. In 1D model atmospheres, each spectral line forms in a restricted range of optical depths. On the other hand, in 3D simulations, the line formation depths are spread in the atmosphere mainly because of temperature and density inhomogeneities. Comparison of cross-correlation function profiles obtained from 3D synthetic spectra with velocities from the 3D simulation shows that the tomographic method correctly recovers the distribution of the velocity component projected on the line of sight in the atmosphere.
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The aim of the study is to identify the structural-narrative, semiotic, and archetypal properties of the Ukrainian multimodal narrative as a semiotic space of secondary signification and social ...mythologization. The data for analysis include slogans and promotional multimodal videos (video narratives) of the Ukrainian brand “Золотий вік” (Golden Age). Based on multimodal research, semiotics and advertising mythology theories, as well as the theories of cultural archetypes, and utilizing multimodal, narrative, narrative-semiotic, and archetypal analysis, in conjunction with conceptual integration tools, the article has achieved the following key results. The Ukrainian brand narrative is a multimodal discursive construct formed by a combination of multiple semiotic codes realized through verbal and non-verbal sign systems via auditory and visual channels. The modules are integrated through multimodal video narratives, constructing a semiotic world integrated with the secondary signified “love” and the associated concepts that replace the denotative meaning of the brand as a jewelry company and its products as ornaments. The secondary signified is verbalized through slogans, visualized through plots, voiced by background songs or voice-over narrators, and encoded by cultural codes in their intertextual and archetypal aspects. Multimodal video-narratives, featuring various characters, narrative plots, and formal-narrative structures, exhibit isomorphism with respect to the possible worlds they construct, archetypal images, motifs, and characters, as well as analogous narrative plots with differing levels of reduction in structural narrative elements. The verbal module, based on a slogan, as well as invariant auditory accompaniment common to all video narratives – the song “Love” and off-screen narrative, supports a hermeneutic code because it contains a key metaphor based on the slogan and peripheral metaphorical components that reveal the conceptual features of its target space. The audio-visual module forms a proaritic code based on the narrative plots of advertising clips in a three-component possible world: extratextual frame narrative, textual pseudoreal narrative, and fairytale narrative. The cultural code is realized through various multimodal resources. The slogan and the brand name include explicit references to the source intertext based on the song. In the video narratives, techniques of interdiscursivity are used, combining elements of melodrama, a romantic story, and a fairy tale, as well as references to archetypal images, motifs, and elements of the archetypal cyclical time. Central to these are the archetypal images of dreams, magic, hearts, and motifs of the magical helper-giver, the journey, crossroads, and magical transformation of those who receive a branded gift. The main archetypes are those of gold and the ring-circle, associated with the symbolism of the sun. Cyclical temporality, associated with mythological time, is actualized by recurring motifs and underpins the unity of love and preciousness from the perspective of the connotations of “eternity” – as eternal spiritual and material values. The semantic code of connotations is related to the secondary signification meanings, which associate the brand’s products with “embodied” love and is based on all the brand’s narrative modules, constructing its social mythology. The symbolic code is based on archetypal symbols and the core value of the brand in its implicit opposition to values foreign to the brand, appealing to the motivational value of “love and the need for belonging” in the hierarchy of human motivations. The perspective for further research is the analysis of the pragmatics of multimodal narratives in Ukrainian brands.
The purpose of the study is to clarify the causes, features of clinical manifestations, to evaluate the results of diagnosis and surgical treatment of patients with sepleen abscesses. The article ...presents data on the results of diagnosis and treatment of 19 patients with spleen abscesses who were treated at the Surgery Department of the Dnipropetrovsk Regional Clinical Hospital named after I.I. Mechnikov, from 2006 to 2018. A comparative analysis of the etiological factors of spleen abscesses among a selected group of patients was carried out. It was established that among the causes of spleen abscesses according to our data were: bacterial endocarditis, purulent diseases of the pancreas, trauma, simple cysts, portal vein thrombosis. When analyzing the results of inoculation of the contents of abscesses, it was determined that E.Coli (26.3%), St. Epidermalis (21.1%), Ac.Baumani (10.5%) and P. Aeruginosa 21.1%) occur the most often. For the diagnosis of spleen abscesses, general clinical, biochemical, and hardware methods of investigation (computed tomography, ultrasound examination of the abdominal organs) were used. The treatment of spleen abscesses was complex and included conservative therapy and surgical methods. As a surgical treatment minimally invasive, laparoscopic, as well as open techniques were used. The main surgical method was percutaneous drainage with ultrasound monitoring (42.1%). Relapse of abscess with this treatment option in the remote period was detected in 1 (5.6%) patient. In 5 (26.3%) cases patients with spleen abscesses underwent laparotomy and splenectomy. Laparoscopy was performed in 2 (10.5%) patients with spleen abscesses, operations were completed by opening, debridement and drainage of the abscess cavity and abdominal cavity. Fatal cases were not observed in the treatment of spleen abscesses. The combination of conservative therapy (using etiotropic antibacterial therapy) and surgical treatment (a combination of minimally invasive and laparoscopic techniques) allowed to achieve good treatment results. The number of complications was 15.8%.
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Temperature and moisture are the main external factors controlling organic matter decomposition and mineralization in soil. The effect of temperature (8 and 22°C) and moisture (15, 30, and 45 mass %) ...of gray forest soil (Luvic Retic Greyzemic Phaeozems (Loamic)) on decomposition of tree residues (leaves, small twigs, thin roots) and agricultural plants (clover aboveground mass and roots, barley straw and roots) has been studied in two long-term experiments. Coarsely crushed (10–2 mm) plant residues were added to the soil in dry form in an amount of 1% of the soil mass. The decomposition of soil organic matter and plant residues were assessed by the quantification of C–CO
2
emitted from the soil. The efficiency and rate of decomposition of soil organic matter and plant residues depended on the type of decomposed material rather than on the temperature and moisture levels. The predominant decomposition of easily decomposable components hid the temperature response of stable compounds and low-quality plant residues. The slowly decomposable plant residues were more sensitive to soil wetting. Temperature coefficients
Q
10
of mineralization of soil organic matter and plant residues were on average 1.66 ± 0.41 and 1.39 ± 0.06, respectively. Moisture coefficients
W
10
in the gravimetric moisture intervals of 15–30 and 30–45% were 1.22 ± 0.09 and 1.21 ± 0.05 for soil and 1.29 ± 0.20 and 1.25 ± 0.13 for plant residues respectively.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
A report is given on the recent advances in the design, synthesis, and development of a new catalytic microreactor for the selective and continuous synthesis of value-added substances used in fine ...organic synthesis and pharmaceutical industry. Inside this advanced reactor, metal nanoparticles are incorporated into mesoporous materials that are deposited as very active and selective catalytic films on the walls of capillary microchannels with diameters of 220 and 530 µm. These microreactor systems require no subsequent separation of the catalyst, which allows their continuous operation. Crystalline and amorphous metal oxides based on titanium dioxide synthesized using the sol gel technique and containing catalytically active polymetallic nanoparticles are potentially the most stable coatings. The catalytic properties and operational stability of capillary microreactors are studied at atmospheric pressure and compared to those of conventional industrial batch reactors. Our Pd
50
Zn
50
/TiO
2
coating displays higher activity (1.5 g
MBE
/(g
Pd
s)) and selectivity (96.7%) than coatings described earlier, and retains high catalytic performance after 88 h of a reaction with Lindlar’s industrial catalyst.
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