In recent years the concepts of Big Data became well established in IT. Systems managing large data volumes produce metadata that describe data and workflows. These metadata are used to obtain ...information about current system state and for statistical and trend analysis of the processes these systems drive. Over the time the amount of the stored metadata can grow dramatically. In this article we present our studies to demonstrate how metadata storage scalability and performance can be improved by using hybrid RDBMS NoSQL architecture.
Diamond particles 3–7μm in size sustained in plasma in a high-dispersion state were coated with cobalt by magnetron sputtering. The relative concentration of cobalt in obtained powders was 2–3 mass. ...%. Sintering the diamond powders with the cobalt coating under the pressure of 8GPa and the temperatures of 2000–2100K resulted in the production of homogeneous specimens having the density of 3.6±0.1gcm−3. The produced diamond compacts demonstrated high values of the ultrasonic wave propagation velocity and elastic moduli.
•We coated 3–7μm-sized diamond particles with cobalt nanolayers using dusty plasma.•We sintered the fine-grained diamond compacts with low cobalt content.•The compacts show high sonic wave propagation velocity and elastic moduli values.
Large-scale scientific experiments produce vast volumes of data. These data are stored, processed and analyzed in a distributed computing environment. The life cycle of experiment is managed by ...specialized software like Distributed Data Management and Workload Management Systems. In order to be interpreted and mined, experimental data must be accompanied by auxiliary metadata, which are recorded at each data processing step. Metadata describes scientific data and represent scientific objects or results of scientific experiments, allowing them to be shared by various applications, to be recorded in databases or published via Web. Processing and analysis of constantly growing volume of auxiliary metadata is a challenging task, not simpler than the management and processing of experimental data itself. Furthermore, metadata sources are often loosely coupled and potentially may lead to an end-user inconsistency in combined information queries. To aggregate and synthesize a range of primary metadata sources, and enhance them with flexible schema-less addition of aggregated data, we are developing the Data Knowledge Base architecture serving as the intelligence behind GUIs and APIs.
The use of high pressure (~8 GPa) in the formation of composite quasi-crystalline materials from powders made it possible to create practically poreless samples with a density close to the maximum ...known for this type of quasi-crystals. For samples with a nickel binder, sintered at a temperature of 550°C, a very low coefficient of friction was obtained, which retain its value during the testing.
Homogeneous incorporation of a small amount of binding material or modifying agent in the batch consisting of micron size particles is a problem of a composite material production process. In this ...work the problem is solved by deposition of a thin coating consisting of binding material on the initial powder particles by means of high-rate magnetron sputtering. The confinement of dusty particles in plasma was used in fine powder processing procedure. Composite powders based on the Al-Cu-Fe quasicrystalline particles with nickel coating were obtained. Their investigation showed that the method provides uniform incorporation of small quantities of additives (at concentration of about 3 wt. %) to fine powders. The powders were pressed at room temperature under quasi-hydrostatic conditions at high pressures. After pressing the samples were sintered in hydrogen at normal pressure. Structure and mechanical properties of the sintered samples were studied. The conditions of sintering the composite powder, which provide producing compacts with improved performance data, were established.
Sheep pox virus is one of the most serious diseases of livestock. The virus causes damage to integuments, spreads rapidly within the herd, and often leads to serious economic losses. The set of ...sanitary and epidemiological measures during outbreaks of the infection largely depends on identification of the virus strain and unambiguous differentiation of the infectious strain from vaccine ones. The most modern and precise approach to identifying virus strains is the whole metagenome sequencing of samples followed by assembly and analysis of the virome of the sample. We evaluate the applicability of shotgun metagenomic sequencing to accurately confirm the species of the virus and to identify it to the level of the strain using de novo assembly of the virome. It is shown that this approach allows one not only to accurately determine the strain affiliation of an infectious agent, but also to reveal and identify possible coinfections of both viral and bacterial natures.
Abstract
The article presents an approach to improving navigation solution of unmanned aerial vehicle in GNSS-denied environment by means of optoelectronic and inertial measurements. An approach is ...based on locating and tracking keypoints on the underlying surface to correct inertial system errors. The approach is based on EKF-SLAM and can be applied both in the presence and in the absence of a terrain map. The simulation results of the optical-inertial navigation system readings are presented.
One of the most important studies dedicated to be solved for ATLAS physical analysis is a reconstruction of proton-proton events with large number of interactions in Transition Radiation Tracker. ...Paper includes Transition Radiation Tracker performance results obtained with the usage of the ATLAS GRID and Kurchatov Institute’s Data Processing Center including Tier-1 grid site and supercomputer as well as analysis of CPU efficiency during these studies.
The spatio-temporal variability of the modern sedimentation process in Lake Onego, the second largest lake in Europe, was evaluated. The chemical composition of the lake water was studied. ...Sedimentation takes place in the oxidation conditions of low TDS water of the calcium bicarbonate type, where the ratio between terrigenous clastic material and lacustrine biochemical suspended matter in the material deposited to the bottom is close to one. We demonstrate that the sedimentation process in the lake is non-uniform. Sedimentation rates in different regions of the lake were estimated (0.1 to 2 kg per sq. m of bottom surface per year) through in situ surveys with sediment traps. Annual sediment input was estimated on the basis of the lake’s chemical balance. Analysis of the qualitative characteristics of the material deposited to the bottom shows its composition corresponds to the humus-Fe-Si type of sedimentation. The uniform texture and mineral composition and the similar multielement spectra of the sediments suggest that active water dynamics cause fine-grained suspended load to remain in the water column for prolonged time periods. Variations in the sediment chemical composition across the lake are due to natural causesand to unevenly distributed anthropogenic pressure.
This Letter presents the first experimental observation of the attractive strong interaction between a proton and a multistrange baryon (hyperon) Ξ−. The result is extracted from two-particle ...correlations of combined p−Ξ−⊕p¯−Ξ¯+ pairs measured in p−Pb collisions at sNN=5.02 TeV at the LHC with ALICE. The measured correlation function is compared with the prediction obtained assuming only an attractive Coulomb interaction and a standard deviation in the range 3.6, 5.3 is found. Since the measured p−Ξ−⊕p¯−Ξ¯+ correlation is significantly enhanced with respect to the Coulomb prediction, the presence of an additional, strong, attractive interaction is evident. The data are compatible with recent lattice calculations by the HAL-QCD Collaboration, with a standard deviation in the range 1.8, 3.7. The lattice potential predicts a shallow repulsive Ξ− interaction within pure neutron matter and this implies stiffer equations of state for neutron-rich matter including hyperons. Implications of the strong interaction for the modeling of neutron stars are discussed.
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