Microservices Validation: Methodology and Implementation

Due to the wide spread of cloud computing, arises actual question about architecture, design and implementation of cloud applications. The microservice model describes the design and development of loosely coupled cloud applications when computing resources are provided on the basis of automated IaaS and PaaS cloud platforms. Such applications consist of hundreds and thousands of service instances, so automated validation and testing of cloud applications developed on the basis of microservice model is a pressing issue. There are constantly developing new methods of testing both individual microservices and cloud applications at a whole. This article presents our vision of a framework for the validation of the microservice cloud applications, providing an integrated approach for the implementation of various testing methods of such applications, from basic unit tests to continuous stability testing

Strain- and Adsorption-Dependent Electronic States and Transport or Localization in Graphene

The chapter generalizes results on influence of uniaxial strain and adsorption on the electron states and charge transport or localization in graphene with different configurations of imperfections (point defects): resonant (neutral) adsorbed atoms either oxygen- or hydrogen-containing molecules or functional groups, vacancies or substitutional atoms, charged impurity atoms or molecules, and distortions. To observe electronic properties of graphene-admolecules system, we applied electron paramagnetic resonance technique in a broad temperature range for graphene oxides as a good basis for understanding the electrotransport properties of other active carbons. Applied technique allowed observation of possible metal-insulator transition and sorption pumping effect as well as discussion of results in relation to the granular metal model. The electronic and transport properties are calculated within the framework of the tight-binding model along with the Kubo-Greenwood quantum-mechanical formalism. Depending on electron density and type of the sites, the conductivity for correlated and ordered adsorbates is found to be enhanced in dozens of times as compared to the cases of their random distribution. In case of the uniaxially strained graphene, the presence of point defects counteracts against or contributes to the band-gap opening according to their configurations. The band-gap behaviour is found to be nonmonotonic with strain in case of a simultaneous action of defect ordering and zigzag deformation. The amount of localized charge carriers (spins) is found to be correlated with the content of adsorbed centres responsible for the formation of potential barriers and, in turn, for the localization effects. Physical and chemical states of graphene edges, especially at a uniaxial strain along one of them, play a crucial role in electrical transport phenomena in graphene-based materials.Comment: 16 pages, 10 figure

The genus Myrmica Latreille, 1804 (Hymenoptera: Formicidae) in Romania : distribution of species and key for their identification

Genus Myrmica is one of the largest ant genera in Romania with 18 species distributed across the entire country. In the frame of this study we present the distribution data of all Romanian Myrmica species: M. bergi, M. constricta, M. gallienii, M. hellenica, M. lobicornis, M. lonae, M. karavajevi, M. rubra, M. ruginodis, M. rugulosa, M. sabuleti, M. salina, M. scabrinodis, M. schencki, M. slovaca, M. specioides, M. sulcinodis and M. vandeli. Four species are reported for the first time in the Romanian fauna: M. bergi, M. constricta, M. gallienii and M. karavajevi, while the occurrence of several species is probable. These species are listed separately. In addition, a key to the worker caste of Myrmica (with the use of male characters for some species) is provided, including species with likely occurrence in Romania

Extrapolation of Multiplicity distribution in p+p(\bar(p)) collisions to LHC energies

The multiplicity (N_ch) and pseudorapidity distribution (dN_ch/d\eta) of primary charged particles in p+p collisions at Large Hadron Collider (LHC) energies of \sqrt(s) = 10 and 14 TeV are obtained from extrapolation of existing measurements at lower \sqrt(s). These distributions are then compared to calculations from PYTHIA and PHOJET models. The existing \sqrt(s) measurements are unable to distinguish between a logarithmic and power law dependence of the average charged particle multiplicity () on \sqrt(s), and their extrapolation to energies accessible at LHC give very different values. Assuming a reasonably good description of inclusive charged particle multiplicity distributions by Negative Binomial Distributions (NBD) at lower \sqrt(s) to hold for LHC energies, we observe that the logarithmic \sqrt(s) dependence of are favored by the models at midrapidity. The dN_ch/d\eta versus \eta for the existing measurements are found to be reasonably well described by a function with three parameters which accounts for the basic features of the distribution, height at midrapidity, central rapidity plateau and the higher rapidity fall-off. Extrapolation of these parameters as a function of \sqrt(s) is used to predict the pseudorapidity distributions of charged particles at LHC energies. dN_ch/d\eta calculations from PYTHIA and PHOJET models are found to be lower compared to those obtained from the extrapolated dN_ch/d\eta versus \eta distributions for a broad \eta range.Comment: 11 pages and 13 figures. Substantially revised and accepted for publication in Journal of Physics

Oxidation resistance Cr-Al steels and calculation of parametric diagrams

У роботі розглянуті питання окалиностійкості сталей із різним вмістом хрому та алюмінію за високих температур. Розроблено методику визначення оптимального хімічного складу жаростійких хромоалюмінієвих сталей залежно від температурних умов і тривалості експлуатації литих деталей. Побудовані параметричні діаграми для визначення окалиностійкості і терміну експлуатації виробів із хромоалюмінієвих сталей. Розроблені моделі дозволяють прогнозувати окалиностійкість сталей із різними концентраціями хрому та алюмінію.In work there are the considered questions of oxidation resistance steels at different temperatures with a different maintenance of chrome and aluminums. Conformity to the law of oxidization of heat-resistant is explored steels in different gases environment. It is set that the heated air is more aggressive environment with the additive 45% of aquatic steam. The increase maintenance of chrome from 18 to 30% results in diminishment of losses of mass from 15 to 5 мг/см². Addition of aluminums to chromic steels also brings to the increase of oxidation resistance studied over steels. Thus, maybe, that became containing of more than a 25% chrome with the addition 2…3% of aluminums has perspective development. For the decline of Saving energy costs and time as mathematical treatment construction of the developed models diagrams was used. The developed method allows to determine different optimum chemical compositions of heat-resistant Cr-Al steels depending on temperature terms and duration of exploitation of the poured details. The developed models allow to determine oxidation resistance and terms of exploitation of Cr-Al steels. The developed models allow with high authenticity to forecast oxidation resistance steels with different concentrations of chrome and aluminums.В работе рассмотренные вопросы окалиностойкости сталей при различных температурах с разным содержанием хрома и алюминия. Разработанно методику определения оптимального химического состава жаростойких хромоалюминиевых сталей в зависимости от температурных условий и длительности эксплуатации литых деталей. Построенно параметрические диаграммы для определения окалиностойкости и сроков эксплуатации хромоалюминиевых сталей. Разработанные модели позволяют прогнозировать окалиностойкисть сталей с различными концентрациями хрома и алюминия

Charged-Particle Multiplicity in Proton-Proton Collisions

This article summarizes and critically reviews measurements of charged-particle multiplicity distributions and pseudorapidity densities in p+p(pbar) collisions between sqrt(s) = 23.6 GeV and sqrt(s) = 1.8 TeV. Related theoretical concepts are briefly introduced. Moments of multiplicity distributions are presented as a function of sqrt(s). Feynman scaling, KNO scaling, as well as the description of multiplicity distributions with a single negative binomial distribution and with combinations of two or more negative binomial distributions are discussed. Moreover, similarities between the energy dependence of charged-particle multiplicities in p+p(pbar) and e+e- collisions are studied. Finally, various predictions for pseudorapidity densities, average multiplicities in full phase space, and multiplicity distributions of charged particles in p+p(pbar) collisions at the LHC energies of sqrt(s) = 7 TeV, 10 TeV, and 14 TeV are summarized and compared.Comment: Invited review for Journal of Physics G -- version 2: version after referee's comment

Sharp Gaussian decay for the one-dimensional harmonic oscillator

We prove a conjecture by Vemuri by proving sharp bounds on $\ell^{\kappa}$ sums of Hermite functions multiplied by an exponentially decaying factor. More explicitly, we prove that, for each $y>0,$ we have $$\sum_{n \ge 1} |h_n(x)|^{\kappa} \frac{e^{-\kappa n y}}{n^{\beta}} \ll_y x^{\frac{1}{2} - 2\beta} e^{-\kappa x^2 \tanh(y)/2},$$ for all $x \in \mathbb{R}$ sufficiently large. Our proof involves the classical Plancherel-Rotach asymptotic formula for Hermite polynomials and a careful local analysis near the maximum point of such a bound.Comment: 5 page

A New Ant Genus (Hymenoptera, Formicidae) from the Late Eocene Rovno Amber

Based on workers from the Late Eocene Rovno amber (Ukraine), Damzenomyrmex gen. n. (Dlichoderinae) is established to include Damzenomyrmex ribbeckei sp. n., which is described here. I consider Damzenomyrmex to be a relative of Dolichoderus s. l. and assign it to the tribe Dolichoderini. Damzenomyrmex differs well from representatives of the previously established subgenera (genera) of Dolichoderus s. l., such as Dolichoderus s. str., Karawajewella, Acanthoclinea, Monoceratoclinea and Diceratoclinea by the nature of the mesosomal armature. It differs from the species of Hypoclinea in the presence of horn-like projections on the anterolateral corners of the pronotum. Regarding the last character, Damzenomyrmex reminds the species of Monacis, but readily differs from them by the non-concave posterior propodeal margin, a different shape of the petiolar scale, a not laterally marginated mesonotum, and some other characters. Furthermore, Damzenomyrmex differs from all Dolichoderus s. l. species in the cuticular structure and in the serration pattern of the mandibles, with the masticatory margin having 6–7 minor sharp teeth and a much longer apical one, the basal angle distinct and the basal margin lacking teeth or denticles. The comparative composition of Dolichoderinae and representatives of other ant subfamilies in late Eocene European ambers is considered