Проблемы и перспективы обогащения тантал-ниобиевых руд

Представлений огляд сучасного стану технології збагачення тантал – ниобиевых руд. Описані основні процеси: рудопідготовка, мокра гвинтова сепарація, концентрація на столах, високоінтенсивна магнітна сепарація, електросепарація, флотація. Наведено найбільш ефективні технологічні рішення та характеристики обладнання для їх реалізації.Представлен обзор современного состояния технологии обогащения тантал – ниобие-вых руд. Описаны основные процессы: рудоподготовка, мокрая винтовая сепарация, кон-центрация на столах, высокоинтенсивная магнитная сепарация, электросепарация, флота-ция. Приведены наиболее эффективные технологические решения и характеристики обору-дование для их реализации.Presents an overview of the current state of technology of the enrichment of tantalum – niobium ores. Described the main processes: ore preparation, wet spiral separation, concentration on tables, high-intensity magnetic separation, electric separation, flotation. The most effective technological so-lutions and characteristics of equipment for their implementation

GVC: efficient random access compression for gene sequence variations

Background: In recent years, advances in high-throughput sequencing technologies have enabled the use of genomic information in many fields, such as precision medicine, oncology, and food quality control. The amount of genomic data being generated is growing rapidly and is expected to soon surpass the amount of video data. The majority of sequencing experiments, such as genome-wide association studies, have the goal of identifying variations in the gene sequence to better understand phenotypic variations. We present a novel approach for compressing gene sequence variations with random access capability: the Genomic Variant Codec (GVC). We use techniques such as binarization, joint row- and column-wise sorting of blocks of variations, as well as the image compression standard JBIG for efficient entropy coding. Results: Our results show that GVC provides the best trade-off between compression and random access compared to the state of the art: it reduces the genotype information size from 758 GiB down to 890 MiB on the publicly available 1000 Genomes Project (phase 3) data, which is 21% less than the state of the art in random-access capable methods. Conclusions: By providing the best results in terms of combined random access and compression, GVC facilitates the efficient storage of large collections of gene sequence variations. In particular, the random access capability of GVC enables seamless remote data access and application integration. The software is open source and available at https://github.com/sXperfect/gvc/

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements