The multiple quantum NMR dynamics in systems of equivalent spins with the dipolar ordered initial state

The multiple quantum (MQ) NMR dynamics in the system of equivalent spins with the dipolar ordered initial state is considered. The high symmetry of the MQ Hamiltonian is used in order to develop the analytical and numerical methods for an investigation of the MQ NMR dynamics in the systems consisting of hundreds of spins from "the first principles". We obtain the dependence of the intensities of the MQ NMR coherences on their orders (profiles of the MQ NMR coherences) for the systems of $200 - 600$ spins. It is shown that these profiles may be well approximated by the exponential distribution functions. We also compare the MQ NMR dynamics in the systems of equivalent spins having two different initial states, namely the dipolar ordered state and the thermal equilibrium state in the strong external magnetic field.Comment: 11 pages 4 figure

Practice of formation of cognitive competence of a future manager

The article justifies a necessity of introduction of a cognitive component, which creates prerequisites of mastering technologies of generation of new knowledge by a graduate with the use of own original schemes and skills, into the system of competences that are formed by the higher school. The article shows the process of formation of the graduate’s cognitive competence in the form of a succession of such its getting more complicated variants as educational, educational and cognitive, intellectual and cognitive, research, and scientific and research. The article provides such elements as the goal, result, assessment criteria and the nature of pedagogical accompaniment in each variant of the structural and logic model of cognitive activity. It provides real examples of results of formation of educational competence taken from the disciplines of the curriculum of training managers. It identifies the final goal of the new technology of the educational process – formation of ability of a student on the basis of analysis of publications and practical experience to detect a new problem, draw up a gnoseological and ontological picture of the world that facilitate development of a constructive mechanism of its collective study, formulate hypotheses, find and realise methods of their examination and identify novelty of the obtained results

Luminescence evidence for bulk and surface excitons in free xenon clusters

Cathodoluminescence spectra of free xenon clusters produced by condensation of xenon-argon gas mixtures in supersonic jets expanding into vacuum were studied. By varying initial experimental parameters, including xenon concentration, we could obtain clusters with a xenon core (300-3500 atoms) covered by an argon outer shell as well as shell-free xenon clusters (about 1500 atoms). The cluster size and temperature (about 40 K for both cases) were measured electronographically. Luminescence bands evidencing the existence of bulk and surface excitons were detected for shell-free xenon clusters. The emission from bulk excitons in small clusters is supposed to be due to processes of their multiple elastic reflections from the xenon-vacuum interface. A presence of an argon shell causes extinction of the excitonic bands. In addition, some new bands were found which have no analogs for bulk xenon cryosamples.Comment: The final modified version will be published in Phys. Rev. A 76 (2007

QUALITY OF CHICORY ROOT SEEDS DEPENDING ON ITS COATING

The results of the impact of the pelleting coating on the quality of seed of Chicory root have been shown. Pelleting of Chicory root contributed to the increase in its size by the diameter and thickness. The best is to create a pellet coating with weighing of 100% of the weight of the seed, which provides the obtaining of the pelleting seed with the adjustment of 87,2% of fraction with 1,5–2,5 mm in diameter. But, even with the application of 100% of the pelleting mixture on Chicory root seed with similarity to pelleting of 95% on average in the three varieties its germinating energy (by 7%,) and similarity (by 5%) significantly decreased compared with the control. Increasing of the weight of the pelleting coating with weight of 150–200%, these indicators significantly decreased compared with the control and with the pelleting seed where the pellet weight was 100% by weight of the see

Multiple quantum NMR of spin-carrying molecules in nanopores: high order corrections to the two-spin/two-quantum Hamiltonian

This paper is devoted to the multiple-quantum (MQ) NMR spectroscopy in nanopores filled by a gas of spin-carrying molecules (s=1/2) in a strong external magnetic field. It turned out that the high symmetry of the spin system in nanopores yields a possibility to overcome the problem of the exponential growth of the Hilbert space dimension with an increase in the number of spins and to investigate MQ NMR dynamics in systems consisting of several hundred spins. We investigate the dependence of the MQ coherence intensities on their order (the profile of the MQ coherence intensities) for a spin system governed by the standard MQ NMR Hamiltonian (the nonsecular two-quantum/two-spin Hamiltonian) together with the second order correction of the average Hamiltonian theory. It is shown that the profile depends on the value of this correction and varies from the exponential to the logarithmic one.Comment: 7 pages, 3 figure

INFLUENCE OF HERBICIDES QUALITY ROYAL ROOTS AND SUGAR BEET SEEDS PROCESSING OF CROPS QUEEN

Research on the effect of herbicides against dicotyledonous weeds Betanal Extra and against grass weeds Centurion on uterine beet growth and development is widely used on sugar beet.No significant difference according to the rules and types of herbicides as ChS component and pollinators and polyspermous for fractional composition of roots was found. The basic amount of ChS component of uterine plants was 150 g from 66 to 72%, polyspermous pollinators - from 46 to 72%, which can be planted by existing planting machines. In the meantime, as on the control such roots by the components were 66 and 42% respectively. However, negative influence of these herbicides on seed biometric indicators, which uterine plants were treated with, wasn’t set. Significant violations of ploidy of uterine beet plant components were determined. Uterine sugar beet treatment with maximum dose of herbicides is recommended for sugar beet sowings, the number of diploids is decreased by 51.3–54.2%, while the number of miksploids is increased in 3,9–4,1 times in comparison with the control. The least chromosomal device change is undergone by the uterine plants processing of Betanal Expert herbicide in norm 1 l/ha. Seed analysis showed that even with such significant violations of ploidy of uterine sugar beet plant components, there is no significant influence of herbicides on seed quality, especially for its purity. Using Extra Betanal herbicide as completely norm and as half of the norm, from the recommended rate and Centurion herbicide half norm from the recommended has not led to germination and purity of seed decreasing. Germination of seed was 66–72% (66% in control), purity - 96,1–97,6% in control 96.6% (LSD05 = 2.6%)

A review of mites and ticks parasitizing rock lizards (Lacertidae: Darevskia)

Rock lizards of the genus Darevskia are interesting research models due to their asexual reproduction. Ectoparasitic mites and ticks of these lizards are poorly known, despite some of these chelicerates being vector pathogens of humans and wildlife. Here we document and curate previously known data on ectoparasitic Acari of rock lizards and, based on our extensive survey, provide an annotated list of these ectoparasitic arthropods (six tick species, one macronyssid species, and seven chigger species). We also provide new host records (Ixodes ricinus on Darevskia caucasica, D. dryada, D. mixta, and D. szczerbaki; Haemaphysalis sulcata on D. rudis; Odontacarus saxicolis on D. brauneri); and new geographical records (O. saxicolis in Russia and Georgia)