Influence of Chelated Micronutrients on Yield and Quality of Potato Tubers

The purpose of this research was the evaluation of the influence of chelate compounds of micronutrients on yield and state tubers of mid-season potato variety Kolobok during storage. The research was conducted on the fields with sod-podzolic sandy loam soil in 2016 and 2017 years. During the research one tuber processing and two foliar processing were done before planting and during vegetation respectively. The experiment had two control groups, the first group was not treated at all and the second group was treated with water. The organization of field experiment, counting and observation were done according to requirements of methods of field experiment and “Methods of investigation of potato varieties”. On average two years groups treated with drugs, which contain chelate compounds of micronutrients, had 4.4 and 4.7 main stems per bush respectively that was more than in control groups. The application of the drugs increased marketable yield by 3.5–3.7 t/ha (13.5–14.2 %). On average two years groups treated with the sulfur-containing drug had the biggest marketable yield that was 9.9 tubers per bush (1.5 tubers per bush or 17 % more than the first control group). The obtained result of the experiment means that these drugs are worth using during potato cultivation

Small-Size Resonant Photoacoustic Cell of Inclined Geometry for Gas Detection

A photoacoustic cell intended for laser detection of trace gases is represented. The cell is adapted so as to enhance the gas-detection performance and, simultaneously, to reduce the cell size. The cell design provides an efficient cancellation of the window background (a parasite response due to absorption of laser beam in the cell windows) and acoustic isolation from the environment for an acoustic resonance of the cell. The useful photoacoustic response from a detected gas, window background and noise are analyzed in demonstration experiments as functions of the modulation frequency for a prototype cell with the internal volume ~ 0.5 cm^3. The minimal detectable absorption for the prototype is estimated to be ~ 1.2 10^{-8} cm^{-1} W Hz^{-1/2}.Comment: 11 pages, 5 figure

Local Spectral Density for a Periodically Driven System of Coupled Quantum States with Strong Imperfection in Unperturbed Energies

A random matrix theory approach is applied in order to analyze the localization properties of local spectral density for a generic system of coupled quantum states with strong static imperfection in the unperturbed energy levels. The system is excited by an external periodic field, the temporal profile of which is close to monochromatic one. The shape of local spectral density is shown to be well described by the contour obtained from a relevant model of periodically driven two-states system with irreversible losses to an external thermal bath. The shape width and the inverse participation ratio are determined as functions both of the Rabi frequency and of parameters specifying the localization effect for our system in the absence of external field.Comment: 6 pages, 5 figures, submitted to Optics and Spectroscop

Impact of heavy-flavour production cross sections measured by the LHCb experiment on parton distribution functions at low x

The impact of recent measurements of heavy-flavour production in deep inelastic $ep$ scattering and in $pp$ collisions on parton distribution functions is studied in a QCD analysis in the fixed-flavour number scheme at next-to-leading order. Differential cross sections of charm- and beauty-hadron production measured by LHCb are used together with inclusive and heavy-flavour production cross sections in deep inelastic scattering at HERA. The heavy-flavour data of the LHCb experiment impose additional constraints on the gluon and the sea-quark distributions at low partonic fractions $x$ of the proton momentum, down to $x \sim 5 \times 10^{-6}$. This kinematic range is currently not covered by other experimental data in perturbative QCD fits