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Continuous-time density-colored bifurcation diagrams
No full textThis work extends the construction of the density-colored bifurcation diagrams proposed by [Moysis et al., 2023] to continuous-time systems, and discusses several variations of them. These diagrams depict the histogram density of the local maxima in the underlying time series solution, using color grading. It thus complements the standard bifurcation diagram, by depicting information about the statistical distribution of the solution across the mapping domain. Several variations of these diagrams can be generated, by changing the colormap scaling, or by computing the statistical distribution of the time series locally or globally. These variations are also discussed. Numerical examples are provided for three chaotic systems. Moreover, MATLAB and Python codes are provided for generating the diagrams
Esej o krindžu
No full textGre za esej, objavljen na spletni strani literarno-umetniškega društva LUD Literatura: https://www.ludliteratura.si/esej-kolumna/gostujoci-esej/esej-o-krindzu
Čezmejna didaktika čezmejne literature
No full textPrispevek je opozoril na potrebo po novih didaktičnih pristopih pri poučevanju književnosti v obmejnih prostorih, s poudarkom na goriškem prostoru
Detecting dark matter subhalos in the Galactic plane with the Cherenkov Telescope Array Observatory
No full textNumerous observations confirm the existence of dark matter (DM) at astrophysical and cosmological
scales, yet the fundamental nature of this elusive component of our Universe remains unknown. Theory and
simulations of Galaxy formation predict that DM should cluster on small scales in bound structures called subhalos or DM clumps. While the most massive DM subhalos host baryonic matter and are observed as dwarf galaxies of the Milky Way (MW), less massive, unpopulated subhalos could be abundant in the
Galaxy as well and yield high-energy gamma rays as final products of DM annihilation. Recently, it has
been highlighted that the brightest halos should also have a sizeable extension in the sky. In this study, we examine the prospects offered by the Cherenkov Telescope Array Observatory (CTAO), a next-generation gamma-ray instrument, for detecting and characterizing such objects. Previous studies have primarily focused on high-latitude observationshere, we assess the potential impact of the CTAO’s Galactic Plane Survey, which will provide unprecedentedly deep survey data for the inner five degrees of the Galactic plane. Our modeling accounts for tidal effects on the subhalo population, examining the conditions under which DM subhalos can be detected and distinguished from conventional astrophysical sources. We find that regions a few degrees above or below the Galactic plane offer the highest likelihood for DM subhalo detection. For an individual subhalo—the brightest from among various realizations of the MW subhalo population—we find that detection at the 5σ level is achievable for an annihilation cross section of hσvi ∼ 3 × 10−25 cm3=s for TeV-scale DM annihilating into b ¯b. For a full population study, depending on the distribution and luminosity model of Galactic subhalos, still unconstrained cross sections in the range hσvi ∼ 10−23–10−22 cm3=s for TeV DM candidates are necessary for the brightest subhalos to be detected
Ana Duša: Kot hiša velika žaba. Ilustrirala Marta Bartolj. Hlebce: Zala (zbirka Mušnica), 2023
No full text
Metabolic traits of sediment bacteria in karst caves in the light of environmental changes
No full textIntroduction
Karst subterranean systems are vulnerable ecosystems that have not yet been studied adequately at the microbial functional level. Cave sediments deposited over different time periods host diverse microbial communities that play a critical role in nutrient cycling and pollutant degradation.
Methods
In this study, we investigated microbial diversity and metabolic capacity in recently deposited alluvial sediments and an ancient palaeo-river deposit in a karst cave system. Using 16S rRNA gene amplicon metagenomic analysis, community-level physiological profiling (CLPP), and chemical characteristics of the environment, the influence of key environmental factors on microbial community composition and substrate degradation, concentrating particularly upon sediment age, oxygen availability, and temperature, was assessed.
Results
The results showed different microbiome compositions and metabolic characteristics between sites. The old alluvial sediment exhibited low taxonomic and functional diversity, accompanied by elevated heavy-metal concentrations, suggesting that sediment age might act as a geochemical filter, limiting microbial function. In contrast, a periodically flooded site showed high metabolic versatility and taxonomic diversity, emphasizing the ecological role of hydrological pulses in maintaining functional microbial diversity. CLPP metrics linked community structure to functional potential, revealing adaptive traits in key taxa such as
Polaromonas
,
Methylibium,
and
Beggiatoa
.
Discussion
These results demonstrated the value of integrating functional and taxonomic approaches in subsurface environments and provide insights into microbial resilience, biogeochemical processes, and the potential for applied environmental use