300 research outputs found
Facet Growth of 4He Crystals at mK Temperatures
We have investigated growth of c facets in good quality helium crystals with screw dislocation densities 0β20 cm exp β2 along the c axis. Three distinct regimes of growth were observed. One of them can be explained by spiral growth provided that kinetic energy of moving steps and their tendency to localization at large driving forces are taken into account. In the absence of screw dislocations we find burstlike growth unless the speed is less than 0.5 nm/s, in which case anomalous, intrinsic growth of facets is detected.Peer reviewe
The results of treatment of chronic recurrent aphthous stomatitis by gel containing zero-valent silver
The article presents the results of complex treatment of chronic recurrent aphthous stomatitis by methylcellulose-based gel with arabinogalactan biocomposite containing zero-valent silver in nano-valent condition. The gel was applied 3-6 times a day at the prescription of Diquertin 0,06 g 3 times a day and Fibrolar 0,3g 3 times a day. The proposed method of treatment allows to improve the effectiveness of treatment by increasing remission and reducing treatment terms
Non-universal equilibrium crystal shape results from sticky steps
The anisotropic surface free energy, Andreev surface free energy, and
equilibrium crystal shape (ECS) z=z(x,y) are calculated numerically using a
transfer matrix approach with the density matrix renormalization group (DMRG)
method. The adopted surface model is a restricted solid-on-solid (RSOS) model
with "sticky" steps, i.e., steps with a point-contact type attraction between
them (p-RSOS model). By analyzing the results, we obtain a first-order shape
transition on the ECS profile around the (111) facet; and on the curved surface
near the (001) facet edge, we obtain shape exponents having values different
from those of the universal Gruber-Mullins-Pokrovsky-Talapov (GMPT) class. In
order to elucidate the origin of the non-universal shape exponents, we
calculate the slope dependence of the mean step height of "step droplets"
(bound states of steps) using the Monte Carlo method, where p=(dz/dx,
dz/dy)$, and represents the thermal averag |p| dependence of , we
derive a |p|-expanded expression for the non-universal surface free energy
f_{eff}(p), which contains quadratic terms with respect to |p|. The first-order
shape transition and the non-universal shape exponents obtained by the DMRG
calculations are reproduced thermodynamically from the non-universal surface
free energy f_{eff}(p).Comment: 31 pages, 21 figure
Taxonomic composition and biodiversity of the gut microbiome from patients with irritable bowel syndrome, ulcerative colitis, and asthma
To date, the association of an imbalance of the intestinal microbiota with various human diseases, including both diseases of the gastrointestinal tract and disorders of the immune system, has been shown. However, despite the huge amount of accumulated data, many key questions still remain unanswered. Given limited data on the composition of the gut microbiota in patients with ulcerative colitis (UC) and irritable bowel syndrome (IBS) from different parts of Siberia, as well as the lack of data on the gut microbiota of patients with bronchial asthma (BA), the aim of the study was to assess the biodiversity of the gut microbiota of patients with IBS, UC and BA in comparison with those of healthy volunteers (HV). In this study, a comparative assessment of the biodiversity and taxonomic structure of gut microbiome was conducted based on the sequencing of 16S rRNA genes obtained from fecal samples of patients with IBS, UC, BA and volunteers. Sequences of the Firmicutes and Bacteroidetes types dominated in all samples studied. The third most common in all samples were sequences of the Proteobacteria type, which contains pathogenic and opportunistic bacteria. Sequences of the Actinobacteria type were, on average, the fourth most common. The results showed the presence of dysbiosis in the samples from patients compared to the sample from HVs. The ratio of Firmicutes/Bacteroidetes was lower in the IBS and UC samples than in HV and higher the BA samples. In the samples from patients with intestinal diseases (IBS and UC), an increase in the proportion of sequences of the Bacteroidetes type and a decrease in the proportion of sequences of the Clostridia class, as well as the Ruminococcaceae, but not Erysipelotrichaceae family, were found. The IBS, UC, and BA samples had signif icantly more Proteobacteria sequences, including Methylobacterium, Sphingomonas, Parasutterella, Halomonas, Vibrio, as well as Escherichia spp. and Shigella spp. In the gut microbiota of adults with BA, a decrease in the proportion of Roseburia, Lachnospira, Veillonella sequences was detected, but the share of Faecalibacterium and Lactobacillus sequences was the same as in healthy individuals. A signif icant increase in the proportion of Halomonas and Vibrio sequences in the gut microbiota in patients with BA has been described for the f irst time
Magnetic phenomena in co-containing layered double hydroxides
Magnetic behavior of CoII(n)AlIII layered double hydroxides (LDHs) (n=Co/Al=2 and 3) intercalated with nitrate was studied as a function of temperature. Both LDH compounds are paramagnetic above about 8K. A rapid increase of their magnetic moments occurs below this temperature until the moments reach the maximum values at Tmax of 4.0K and 3.2K for Co(2)Al-NO3 and Co(3)Al-NO3, respectively. Below Tmax, the zero-field-cooled and the field-cooled static magnetization curves are strongly different. Along with this low-temperature phenomena, Co(2)Al-NO3 and Co(3)Al-NO3 demonstrate anomalous behavior of their temperature dependence magnetic susceptibility in a highertemperature range: between 75 and 175K, both the paramagnetic Curie temperature and the effective magnetic moment change in a non-monotonous way. Possible structural reasons of the observed magnetic behavior of the CoII(n)AlIII LDHs are discussed.publishe
High-power ultrasonic synthesis and magnetic-field-assisted arrangement of nanosized crystallites of cobalt-containing layered double hydroxideu
High-quality stoichiometric Co2AlβNO3 and Co2AlβCO3 layered double hydroxides (LDHs) have been obtained by precipitation followed by anion exchange, both high-power sonication assisted. Application of high-power ultrasound has been demonstrated to result in a considerable acceleration of the crystallization process and the anion-exchange reaction. Two independent approaches were used to form bulk and 2-D samples of Co2AlβNO3 with the oriented crystallites, namely uniaxial pressing of deposits from sonicated LDH slurries and magnetic field assisted
arrangement of LDH crystallites precipitating on glass substrates. A convenient way of preparation of semi-transparent compacts with relatively big blocks of oriented crystallites have been demonstrated. Thin dense transparent films of highly-ordered crystallites of Co2AlβNO3 LDH have been produced and characterized.publishe
Initial coin offering (ICO) ΠΊΠ°ΠΊ ΡΡΠ°Π½ΡΡΠΎΡΠΌΠ°ΡΠΈΡ ΡΠΈΠ½Π°Π½ΡΠΎΠ²ΠΎΠ³ΠΎ ΠΈΠ½ΡΡΠΈΡΡΡΠ° ΠΊΠΎΠ»Π»Π΅ΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΠΈΠ½Π²Π΅ΡΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ
In conditions of financial institutionsβ development it is crucial to examine the transformation in the form of a collective investment institution under the influence of digitalization and, in particular, the emergence of cryptocurrencies. The subject of the research refers to the features of ICO functioning as a transformation of a financial institution for collective investment. The goal is to explore the ICO as a new form of collective investment. The results of the research are achieved through a comprehensive comparative analysis of ICO and IPO as a basic tool of financial institutions. The paper highlights the advantages and disadvantages, identifies the factors, analyzes the institutional regulation of ICO and proposes development vectors from three angles: for project creators, investors, regulators. The results can be used in policymaking, the functioning of joint investment platforms, in training specialists in the field of digital economy and financial markets.Π ΡΡΠ»ΠΎΠ²ΠΈΡΡ
ΡΠ°Π·Π²ΠΈΡΠΈΡ ΡΠΈΠ½Π°Π½ΡΠΎΠ²ΡΡ
ΠΈΠ½ΡΡΠΈΡΡΡΠΎΠ² Π°ΠΊΡΡΠ°Π»ΡΠ½ΠΎ ΡΡΠΎΠΈΡ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠ° ΠΈΠ·ΡΡΠ΅Π½ΠΈΡ ΡΡΠ°Π½ΡΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΡΠΎΡΠΌΡ ΠΈΠ½ΡΡΠΈΡΡΡΠ° ΠΊΠΎΠ»Π»Π΅ΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΠΈΠ½Π²Π΅ΡΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎΠ΄ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ΠΌ ΡΠΈΡΡΠΎΠ²ΠΈΠ·Π°ΡΠΈΠΈ, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΊΡΠΈΠΏΡΠΎΠ²Π°Π»ΡΡ, Π² ΡΠ°ΡΡΠ½ΠΎΡΡΠΈ. ΠΡΠ΅Π΄ΠΌΠ΅Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ β ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠΈ ΡΡΠ½ΠΊΡΠΈΠΎΠ½ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ICO ΠΊΠ°ΠΊ ΡΡΠ°Π½ΡΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΡΠΈΠ½Π°Π½ΡΠΎΠ²ΠΎΠ³ΠΎ ΠΈΠ½ΡΡΠΈΡΡΡΠ° ΠΊΠΎΠ»Π»Π΅ΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΠΈΠ½Π²Π΅ΡΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ. Π¦Π΅Π»Ρ β ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΡ ICO ΠΊΠ°ΠΊ Π½ΠΎΠ²ΡΡ ΡΠΎΡΠΌΡ ΠΊΠΎΠ»Π»Π΅ΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΠΈΠ½Π²Π΅ΡΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π΄ΠΎΡΡΠΈΠ³Π½ΡΡΡ ΡΠ΅ΡΠ΅Π· ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠ΅ Π³Π»ΡΠ±ΠΎΠΊΠΎΠ³ΠΎ ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ Π°Π½Π°Π»ΠΈΠ·Π° ICO ΠΈ IPO ΠΊΠ°ΠΊ ΠΈΠ½ΡΡΡΡΠΌΠ΅Π½ΡΠ° ΡΠΈΠ½Π°Π½ΡΠΎΠ²ΡΡ
ΠΈΠ½ΡΡΠΈΡΡΡΠΎΠ². ΠΡΠ΄Π΅Π»Π΅Π½Ρ ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ²Π° ΠΈ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΊΠΈ, ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Ρ ΡΠ°ΠΊΡΠΎΡΡ, ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ Π°Π½Π°Π»ΠΈΠ· ΠΈΠ½ΡΡΠΈΡΡΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠ΅Π³ΡΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ICO, ΠΏΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Ρ Π²Π΅ΠΊΡΠΎΡΡ ΡΠ°Π·Π²ΠΈΡΠΈΡ Π² ΡΡΠ΅Ρ
ΠΏΠ»ΠΎΡΠΊΠΎΡΡΡΡ
: Π΄Π»Ρ ΡΠΎΠ·Π΄Π°ΡΠ΅Π»Π΅ΠΉ ΠΏΡΠΎΠ΅ΠΊΡΠΎΠ², ΠΈΠ½Π²Π΅ΡΡΠΎΡΠΎΠ², ΡΠ΅Π³ΡΠ»ΡΡΠΎΡΠΎΠ². Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΌΠΎΠ³ΡΡ Π±ΡΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½Ρ ΠΏΡΠΈ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ΅ Π·Π°ΠΊΠΎΠ½ΠΎΠ², ΡΡΠ½ΠΊΡΠΈΠΎΠ½ΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ ΠΏΠ»Π°ΡΡΠΎΡΠΌ ΡΠΎΠ²ΠΌΠ΅ΡΡΠ½ΠΎΠ³ΠΎ ΠΈΠ½Π²Π΅ΡΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ, ΠΏΡΠΈ ΠΏΠΎΠ΄Π³ΠΎΡΠΎΠ²ΠΊΠ΅ ΡΠΏΠ΅ΡΠΈΠ°Π»ΠΈΡΡΠΎΠ² Π² ΠΎΠ±Π»Π°ΡΡΠΈ ΡΠΈΡΡΠΎΠ²ΠΎΠΉ ΡΠΊΠΎΠ½ΠΎΠΌΠΈΠΊΠΈ ΠΈ ΡΠΈΠ½Π°Π½ΡΠΎΠ²ΡΡ
ΡΡΠ½ΠΊΠΎΠ²
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