Influence of temperature condition on the process of СNM generation

Role of surface in processes of carbon nanomaterials generation in plasma-liquid system was analyzed. Qualitative analysis of samples was supplied by spectrophotometrical methods, X-rays microanalysis and scanning microscope. Influence of substrate temperature on carbon deposited nanostructures was shown. Possibility of obtaining carbon nanostructures with metal inclusions in plasma-liquid systems from ethanol was presented.Досліджено роль поверхні в процесах генерації вуглецевих наноматеріалів (ВНМ) у плазмово-рідинній системі на базі вторинного розряду. Якісний аналіз зразків проводився за допомогою спектрофотометричної методики, рентгенівського мікроаналізу та скануючої мікроскопії. Показано вплив температури підкладки на вихідні ВНМ. Продемонстровано можливість отримання вуглецевих наноструктур з включенням значної кількості металів.Исследована роль поверхности в процессах генерации углеродных наноматериаллов (УНМ) в плазменно- жидкостной системе с вторичным разрядом. Качественный анализ образцов проводился с помощью спектрофотометрической методики, рентгеновского микроанализа и сканирующей микроскопии. Показано влияние температуры подложки на полученные УНМ. Продемонстрирована возможность получения углеродных наноструктур с включением значительного количества металлов

Hadronic B Decays to Charmed Baryons

We study exclusive B decays to final states containing a charmed baryon within the pole model framework. Since the strong coupling for $\Lambda_b\bar B N$ is larger than that for $\Sigma_b \bar BN$, the two-body charmful decay $B^-\to\Sigma_c^0\bar p$ has a rate larger than $\bar B^0\to\Lambda_c^+\bar p$ as the former proceeds via the $\Lambda_b$ pole while the latter via the $\Sigma_b$ pole. By the same token, the three-body decay $\bar B^0\to\Sigma_c^{++}\bar p\pi^-$ receives less baryon-pole contribution than $B^-\to\Lambda_c^+\bar p\pi^-$. However, because the important charmed-meson pole diagrams contribute constructively to the former and destructively to the latter, $\Sigma_c^{++}\bar p\pi^-$ has a rate slightly larger than $\Lambda_c^+\bar p\pi^-$. It is found that one quarter of the $B^-\to \Lambda_c^+\bar p\pi^-$ rate comes from the resonant contributions. We discuss the decays $\bar B^0\to\Sigma_c^0\bar p\pi^+$ and $B^-\to\Sigma_c^0\bar p\pi^0$ and stress that they are not color suppressed even though they can only proceed via an internal W emission.Comment: 25 pages, 6 figure

Variational self-consistent theory for trapped Bose gases at finite temperature

We apply the time-dependent variational principle of Balian-V\'en\'eroni to a system of self-interacting trapped bosons at finite temperature. The method leads to a set of coupled non-linear time dependent equations for the condensate density, the thermal cloud and the anomalous density. We solve numerically these equations in the static case for a harmonic trap. We analyze the various densities as functions of the radial distance and the temperature. We find an overall good qualitative agreement with recent experiments as well as with the results of many theoretical groups. We also discuss the behavior of the anomalous density at low temperatures owing to its importance to account for many-body effects.Comment: 8 pages, 8 figure

Next-to-next-to-leading order prediction for the photon-to-pion transition form factor

We evaluate the next-to-next-to-leading order corrections to the hard-scattering amplitude of the photon-to-pion transition form factor. Our approach is based on the predictive power of the conformal operator product expansion, which is valid for a vanishing $\beta$-function in the so-called conformal scheme. The Wilson--coefficients appearing in the non-forward kinematics are then entirely determined from those of the polarized deep-inelastic scattering known to next-to-next-to-leading accuracy. We propose different schemes to include explicitly also the conformal symmetry breaking term proportional to the $\beta$-function, and discuss numerical predictions calculated in different kinematical regions. It is demonstrated that the photon-to-pion transition form factor can provide a fundamental testing ground for our QCD understanding of exclusive reactions.Comment: 62 pages LaTeX, 2 figures, 9 tables; typos corrected, some references added, to appear in Phys. Rev.

Performance of novel VUV-sensitive Silicon Photo-Multipliers for nEXO

Liquid xenon time projection chambers are promising detectors to search for neutrinoless double beta decay (0$\nu \beta \beta$), due to their response uniformity, monolithic sensitive volume, scalability to large target masses, and suitability for extremely low background operations. The nEXO collaboration has designed a tonne-scale time projection chamber that aims to search for 0$\nu \beta \beta$ of \ce{^{136}Xe} with projected half-life sensitivity of $1.35\times 10^{28}$~yr. To reach this sensitivity, the design goal for nEXO is $\leq$1\% energy resolution at the decay $Q$-value ($2458.07\pm 0.31$~keV). Reaching this resolution requires the efficient collection of both the ionization and scintillation produced in the detector. The nEXO design employs Silicon Photo-Multipliers (SiPMs) to detect the vacuum ultra-violet, 175 nm scintillation light of liquid xenon. This paper reports on the characterization of the newest vacuum ultra-violet sensitive Fondazione Bruno Kessler VUVHD3 SiPMs specifically designed for nEXO, as well as new measurements on new test samples of previously characterised Hamamatsu VUV4 Multi Pixel Photon Counters (MPPCs). Various SiPM and MPPC parameters, such as dark noise, gain, direct crosstalk, correlated avalanches and photon detection efficiency were measured as a function of the applied over voltage and wavelength at liquid xenon temperature (163~K). The results from this study are used to provide updated estimates of the achievable energy resolution at the decay $Q$-value for the nEXO design

Hypophosphatasia in children. Three faces of one disease

S.A. Boykov1, I.Yu. Chernyak1, N.S. Shatokhina1, E.Yu. Gurkina2, N.A. Borodina3, E.F. Chelabova3, S.A. Epoeva3 1Children’s Regional City Hospital, Krasnodar, Russian Federation 2V.A. Almazov National Medical Research Center, St. Petersburg, Russian Federation 3Children’s Hospital of the city of Armavir, Armavir, Russian Federation Hypophosphatasia (HPP) is a rare multisystem inherited metabolic disorder caused by mutations in ALPL gene that encodes tissue nonspecific alkaline phosphatase responsible for bone mineralization. HPP is characterized by impaired bone mineralization, skeletal abnormalities, and systemic manifestations which result in significant morbidity and mortality. Clinical presentations of HPP vary greatly. Early (perinatal and infantile) HPP is characterized by the most severe symptoms, i.e., respiratory and neurological disorders are of crucial importance being the leading causes of death. Progressive skeletal impairment, rickets-like deformities, reduced mobility, and severe disability are typical of childhood-onset HPP. The biochemical hallmark of HPP is low alkaline phosphatase (ALP) activity. HPP diagnosis is verified by clinical symptoms in combination with persistently low ALP activity (adjusted for age and sex). Molecular genetic test to identify ALPL gene mutation is performed&nbsp; as needed. Three case reports addresses authors’ experience with the diagnosis and treatment for HPP. Keywords: hypophosphatasia, case series, alkaline phosphatase, impaired bone mineralization, asfotase alfa. For citation: Boykov S.A., Chernyak I.Yu., Shatokhina N.S. et al. Hypophosphatasia in children. Three faces of one disease. Russian Journal of Woman and Child Health. 2020;3(2):136–141. DOI: 10.32364/2618-8430-2020-3-2-136-141. </p

Measurements of thermophoretic velocities of aerosol particles in microgravity conditions in different carrier gases

Measurements of the thermophoretic velocities of aerosol particles (paraffin) in different carrier gases (helium, nitrogen, argon, xenon) were performed in microgravity conditions (the drop tower facility, in Bremen). The experiments permitted the study of thermophoresis in conditions which minimize the impact of gravity. Monodisperse aerosol particles were observed through a digital holographic velocimeter, a device allowing the determination of 3-D coordinates of particles in the viewing volume. Particle trajectories, and consequently particle velocities, were reconstructed by analysing the sequence of particle positions. We successfully observed thermophoretic velocities in low-gravity conditions. The experiments show that the thermophorefic velocity decreases from helium (He) to nitrogen (N-2), argon (At), and xenon (Xe)

Evolution of Oxygen–Ion and Proton Conductivity in Ca-Doped Ln2Zr2O7 (Ln = Sm, Gd), Located Near Pyrochlore–Fluorite Phase Boundary

Sm2&minus;xCaxZr2O7&minus;x/2 (x = 0, 0.05, 0.1) and Gd2&minus;xCaxZr2O7&minus;x/2 (x = 0.05, 0.1) mixed oxides in a pyrochlore&ndash;fluorite morphotropic phase region were prepared via the mechanical activation of oxide mixtures, followed by annealing at 1600 &deg;C. The structure of the solid solutions was studied by X-ray diffraction and refined by the Rietveld method, water content was determined by thermogravimetry (TG), their bulk and grain-boundary conductivity was determined by impedance spectroscopy in dry and wet air (100&ndash;900 &deg;C), and their total conductivity was measured as a function of oxygen partial pressure in the temperature range: 700&ndash;950 &deg;C. The Sm2&minus;xCaxZr2O7&minus;x/2 (x = 0.05, 0.1) pyrochlore solid solutions, lying near the morphotropic phase boundary, have proton conductivity contribution both in the grain bulk and on grain boundaries below 600 &deg;C, and pure oxygen&ndash;ion conductivity above 700 &deg;C. The 500 &deg;C proton conductivity contribution of Sm2&minus;xCaxZr2O7&minus;x/2 (x = 0.05, 0.1) is ~ 1 &times; 10&minus;4 S/cm. The fluorite-like Gd2&minus;xCaxZr2O7&minus;x/2 (x = 0.1) solid solution has oxygen-ion bulk conductivity in entire temperature range studied, whereas proton transport contributes to its grain-boundary conductivity below 700 &deg;C. As a result, of the morphotropic phase transition from pyrochlore Sm2&minus;xCaxZr2O7&minus;x/2 (x = 0.05, 0.1) to fluorite-like Gd2&minus;xCaxZr2O7&minus;x/2 (x = 0.05, 0.1), the bulk proton conductivity disappears and oxygen-ion conductivity decreases. The loss of bulk proton conductivity of Gd2&minus;xCaxZr2O7&minus;x/2 (x = 0.05, 0.1) can be associated with the fluorite structure formation. It is important to note that the degree of Ca substitution in such solid solutions (Ln2&minus;xCax)Zr2O7&minus;&delta; (Ln = Sm, Gd) is low, x &lt; 0.1. In both series, grain-boundary conductivity usually exceeds bulk conductivity. The high grain-boundary proton conductivity of Ln2&minus;xCaxZr2O7&minus;x/2 (Ln = Sm, Gd; x = 0.1) is attributable to the formation of an intergranular CaZrO3-based cubic perovskite phase doped with Sm or Gd in Zr sublattice