Developing model of mass-exchange processes in porous bodies on example of iron-ore pellets oxidation process

There is developed a model of magnetite oxidation in agglomeration of iron-ore pellets. Unlike the oxidation models proposed before, this model considers the porous structure of a pellet: the surface and the distribution of pores by sizes. The process of magnetite oxidation is considered as three-unit: diffusion by pores, diffusion through products of oxidation and proper chemical reaction. The model considers various limiting steps at different stages of the process. There were carried out pilot studies on the basis of SSMCC pellets for confirming the correctness of the proposed model. This model can be used in a broader aspect: for the description of the process of chemical reaction in polyporous bodies

Using high-chromium iron as material for production of the equipping components of mine shafts

This paper deals with service conditions of shaft equipment, in particular, inserts of sliding bearings for the purpose of increasing service life due to material substitution and wear resistance increase. As a new material high-chromium irons are offered. Studies are conducted on a microstructure and wear resistance of prototypes is measured. Experimental data are treated by methods of mathematical statistics which confirm reliability of results. The results obtained make it possible to suggest using high-chromium irons as the direct material to produce inserts of sliding bearings

Generating Abstractive Summaries from Meeting Transcripts

Summaries of meetings are very important as they convey the essential content of discussions in a concise form. Generally, it is time consuming to read and understand the whole documents. Therefore, summaries play an important role as the readers are interested in only the important context of discussions. In this work, we address the task of meeting document summarization. Automatic summarization systems on meeting conversations developed so far have been primarily extractive, resulting in unacceptable summaries that are hard to read. The extracted utterances contain disfluencies that affect the quality of the extractive summaries. To make summaries much more readable, we propose an approach to generating abstractive summaries by fusing important content from several utterances. We first separate meeting transcripts into various topic segments, and then identify the important utterances in each segment using a supervised learning approach. The important utterances are then combined together to generate a one-sentence summary. In the text generation step, the dependency parses of the utterances in each segment are combined together to create a directed graph. The most informative and well-formed sub-graph obtained by integer linear programming (ILP) is selected to generate a one-sentence summary for each topic segment. The ILP formulation reduces disfluencies by leveraging grammatical relations that are more prominent in non-conversational style of text, and therefore generates summaries that is comparable to human-written abstractive summaries. Experimental results show that our method can generate more informative summaries than the baselines. In addition, readability assessments by human judges as well as log-likelihood estimates obtained from the dependency parser show that our generated summaries are significantly readable and well-formed.Comment: 10 pages, Proceedings of the 2015 ACM Symposium on Document Engineering, DocEng' 201

Developing model of mass-exchange processes in porous bodies on example of iron-ore pellets oxidation process

There is developed a model of magnetite oxidation in agglomeration of iron-ore pellets. Unlike the oxidation models proposed before, this model considers the porous structure of a pellet: the surface and the distribution of pores by sizes. The process of magnetite oxidation is considered as three-unit: diffusion by pores, diffusion through products of oxidation and proper chemical reaction. The model considers various limiting steps at different stages of the process. There were carried out pilot studies on the basis of SSMCC pellets for confirming the correctness of the proposed model. This model can be used in a broader aspect: for the description of the process of chemical reaction in polyporous bodies

Determination of composition and fluidity of an alloy for impregnating hard alloys on the basis of titanium carbide

In this paper optimum compositions of a metal bond of Cr – Ni - Co system are determined by mathematical planning methods. As a response function, value of bending strength at a temperature of 800 °C was used. On the basis of the developed planning matrix samples of required composition were made, bending strength and long-term strength are measured. A certain composition of alloy-bond and its quantity is found. Spiral tests were conducted to determine fluidity

Studying laser radiation effect on steel structure and properties

There was studied the effect of laser radiation on the structure and properties of annealed and tempered steel with different content of carbon. For surface hardening there was used a laser complex equipped with Nd: YAG pulse laser with power density up to 30 kW/сm2. As a result of the carried-out studies there were calculated characteristics of laser, steel microstructure and properties

Study of the Fast X-Ray Transient XTE J1901+014 Based on INTEGRAL, RXTE and ROSAT Data

The source XTE J1901+014 discovered by the RXTE observatory during an intense outburst of hard radiation and classified as a fast X-ray transient is studied. The source's spectral characteristics in the quiescent state have been investigated for the first time both in the soft X-ray energy range (0.6-20 keV) based on ROSAT and RXTE data and in the hard energy range (>20 keV) based on INTEGRAL data. A timing analysis of the source's properties has revealed weak nonperiodic bursts of activity on time scales of several tens of seconds and two intense ($\sim$0.5-1 Crab) outbursts more than several hundred seconds in duration. Certain assumptions about the nature of the object under study are made.Comment: 19 pages, 7 figure

Using high-chromium iron as material for production of the equipping components of mine shafts

This paper deals with service conditions of shaft equipment, in particular, inserts of sliding bearings for the purpose of increasing service life due to material substitution and wear resistance increase. As a new material high-chromium irons are offered. Studies are conducted on a microstructure and wear resistance of prototypes is measured. Experimental data are treated by methods of mathematical statistics which confirm reliability of results. The results obtained make it possible to suggest using high-chromium irons as the direct material to produce inserts of sliding bearings

Fungal literature records database of the Northern West Siberia (Russia)

Background Mycological research in the Northern part of West Siberia has now become sufficient for review and digitisation as over 460 scientific works have been completed mainly since the beginning of the 20th century. The history of research in the region started from isolated studies at the beginning of the 20th century, but regular and systematic research started from the 1970s. Over the following decades, several dozens of researchers have worked in the area, but the reported occurrences were scattered amongst a broad variety of publications, mainly hardly available. The great need in digitisation and accumulation of fungal records reported in published literature in a standardised regional database has now become evident. The «Fungal records database of the Northern West Siberia» (FuNWS) was initiated in 2016 according to contemporary biodiversity data standards (Darwin Core), to be compatible and accessible by the broad research community. The database has been supplemented ever since by the collective effort of specialists working in the area. According to the database summary report, there are 3358 fungal and fungus-like species revealed in the Northern West Siberia at present. The richest in species number classes are Agaricomycetes (60%) and Lecanoromycetes (33%) with a total of 25 classes represented. The FuNWS database was uploaded to Global Biodiversity Information Facility (GBIF) (Ygra State University Biological Collection publisher) on 11 November 2017 (earlier titled «Fungal Records Database of Yugra, FReDY») to provide open access to the data and its reusability (Filippova et al. 2020). New information This publication summarises the results of the digitisation of literature-based occurrence records of fungi and fungus-like organisms initiated in the Northern part of West Siberia for the first time in the history of mycological research. The bibliography of regional mycological publications was created to include about 460 published works (Suppl. material 2). In total, about 140 literature sources were digitised and about 22000 occurrence records were integrated into the FuNWS database (Filippova et al. 2020). © Filippova N et al.20-04-00349Russian Foundation for Basic Research, Ð Ð¤Ð¤Ð : 18-05-00398Russian Foundation for Basic Research, Ð Ð¤Ð¤Ð : 13-01-20/39, 18-44-860017The research was funded by the Russian Fund for Basic Research and Government of the Khanty-Mansiysk Autonomous region according to the research project 18-44-860017 and grant 13-01-20/39 of the Yugra State University. Anton G. Shiryaev was partially funded by the Russian Foundation for Basic Research No 18-05-00398 А. Elena A. Zvyagina was supported by the KhMAO – Ugra government assignment for Surgut State University №20-04-00349. А. S. Arefyev was supported by the Fundemental research programme of the Tyumen Scientific Center SB RAS VI.52.1. project number AAAA-A17-117050400146-1. The authors are grateful to Ilya Filippov for preparation of a graph