This paper studies both Formula omittedCDM and CDM models under the über gravity theory, named ü Formula omittedCDM and üCDM respectively. We report bounds over their parameter phase-space using ...several cosmological data, in particular, the recent Pantheon+ sample. Based on the joint analysis, the best fit value of the über characteristic parameter is Formula omitted and Formula omitted at 68% confidence level for ü Formula omittedCDM and üCDM respectively. Although über gravity can successfully mimics the cosmological constant, we find that the Formula omitted diagnostic suggests the Formula omitted tension is not alleviated. Finally, both models are statistically compared with Formula omittedCDM through the Akaike and Bayesian information criteria. Both über gravity models and Formula omittedCDM are equally preferred for most of the single samples, in particular, ü Formula omittedCDM is not rejected by the CMB data. However, there is strong evidence against them for the joint analysis.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Abstract
The analysis of the time profile of electrical signals produced by energy depositions in germanium detectors allows discrimination of events with different topologies. This is especially ...relevant for experiments searching for the neutrinoless double beta decay of
$$^{76}$$
76
Ge to distinguish the sought-after signal from other background sources. The standard calibration procedures used to tune the selection criteria for double-beta decay events use a
$$^{228}$$
228
Th source, because it provides samples of signal-like events. These samples exhibit energy spatial distributions with subtle different topologies compared to neutrinoless double-beta decay events. In this work, we will characterize these topological differences and, with the support of a
$$^{56}$$
56
Co source, evaluate biases and precision of calibration techniques which use such event samples. Our results will be particularly relevant for future experiments in which a solid estimation of the efficiency is required.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
The mygalomorph spiders of the family Atypidae are among the most archaic spiders. The genus Atypus Latreille, 1804 occurs in Eurasia and northern Africa, with a single enigmatic species, Atypus ...snetsingeri Sarno, 1973, known only from a small area in southeastern Pennsylvania in eastern USA. A close relationship to European species could be assumed based on geographic proximity, but A. snetsingeri more closely resembled Asian species. This study was undertaken to learn more about the genetics of A. snetsingeri, its habitat requirements and natural history. Molecular markers (CO1 sequences) were compared to available data for other atypids and showed that A. snetsingeri is identical with A. karschi Dönitz, 1887 native to East Asia. Natural history parameters in Pennsylvania were also similar in every respect to A. karschi in Japan, therefore, we propose that the spider is an introduced species and the specific epithet snetsingeri is relegated to a junior synonym of A. karschi. Cytogenetic analysis showed an X0 sex chromosome system (42 chromosomes in females, 41 in males) and we also detected nucleolus organizing regions and heterochromatin, the latter for the first time in the Atypoidea. In Pennsylvania the spider is found in a variety of habitats, from forests to suburban shrubbery, where the above-ground webs are usually attached vertically to trees, shrubs, or walls, although other webs are oriented horizontally near the ground. Prey include millipedes, snails, woodlice, carabid beetles and earthworms. Atypus karschi is the first known case of an introduced purse-web spider. It is rarely noticed but well-established within its range in southeastern Pennsylvania.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
16.
Enhanced Catalytic Activity of a Cd Arora, Zinnia; Markad, Datta; Khullar, Sadhika ...
Catalysis letters,
07/2023, Letnik:
153, Številka:
7
Journal Article
Recenzirano
Using a new unsymmetrical and flexible primary amide-functionalized ligand, a novel crystalline complex, Cd((S)-2-BPMEG)(H.sub.2O)(ClO.sub.4).sub.2.sup..2H.sub.2O (1), has been synthesized under ...ambient conditions and characterized by various analytical techniques. Its activated form (1a), obtained upon heating under vacuum at 80 °C for 8 h, acts as an excellent heterogeneous catalyst (2 mol% and 30 min at 25-27 °C) for the solvent-free cyanosilylation reaction of various derivatives of benzaldehyde, aliphatic, cycloaliphatic and heterocyclic aldehydes with trimethylsilyl cyanide (TMSCN) in 97-100% conversion. Compared to the symmetrical analogue, its catalytic activity enhanced by an order of magnitude is remarkable. The catalyst is recyclable up to five consecutive cycles without significant loss of activity and structural integrity.
Many different atmospheric, physical, and chemical processes are affected by ions. An important sink for atmospheric ions is the reaction and mutual neutralisation of a positive and negative ion, ...also called ion-ion recombination. While the value for the ion-ion recombination coefficient α is well-known for standard conditions (namely 1.7 x 10.sup.-6 cm.sup.3 s.sup.-1 ), it needs to be calculated for deviating temperature and pressure conditions, especially for applications at higher altitudes of the atmosphere. In this work, we review the history of theories and parameterisations of the ion-ion recombination coefficient, focussing on the temperature and pressure dependencies as well as the altitude range between 0 and 50 km. Commencing with theories based on J. J. Thomson's work, we describe important semi-empirical adjustments as well as field, model, and laboratory data sets, followed by short reviews of binary recombination theories, model simulations, and the application of ion-aerosol theories to ion-ion recombination. We present a comparison between theories, parameterisations, and field, model, and laboratory data sets to conclude favourable parameterisations. While many theories agree well with field data above an altitude of approximately 10 km, the nature of the recombination coefficient is still widely unknown between Earth's surface and an altitude of 10 km. According to the current state of knowledge, it appears reasonable to assume an almost constant value for the recombination coefficient for this region, while it is necessary to use values that are adjusted for pressure and temperature for altitudes above 10 km. Suitable parameterisations for different altitude ranges are presented and the need for future research, be it in the laboratory or by means of modelling, is identified.
Constructing core/shell nanoarrays with optimal structure and composition can maximize solar light utilization. In the present work, a distinct regular array of SiC/TiO.sub.2 core/shell nanoarray ...photoanodes with improved charge separation is successfully achieved through two sequential steps of electrochemical etching and atomic layer deposition. The suitable band offset between SiC and TiO.sub.2 results in forming a type-II heterojunction at the SiC/TiO.sub.2 interface, which efficiently promotes electron-hole separation. Under simulated sunlight illumination (100 mW/cm.sup.2), the SiC/TiO.sub.2 nanoarray composite photoanode exhibits a significantly improved photocurrent of 3.62 mA/cm.sup.2 at 1.4 V versus Ag/AgCl, which demonstrates significantly increased photoelectrochemical (PEC) activity compared to the intrinsic SiC photoanode. The significant enhancement of PEC behaviors is mainly assigned to the improved electron-hole separation at the surface of the junction, combined with the synergistic effect of the highly oriented nanochannel array configuration, single-crystal character of the etched entire SiC nanoarray film, as well as the incorporation of N dopants.
