PARAMETRIZED EVENT ANALYSIS FROM SOCIAL NETWORKS

The growth of data in social networks facilitate demand for data analysis. The field of event detection is of increasing interest to researchers. Events from real life are actively discussed in the virtual space. Event detection results can be used in a variety of applications, from digital marketing to collecting data about natural disasters. Thereby, researchers face the emergence of new algorithms along with the improvement of existing solutions in the event detection field. This paper proposes improvements to the SEDTWik (Segment-based Event Detection from Tweets using Wikipedia) algorithm. The SEDTWik algorithm is designed to detect events without contextual guidance. The overall SEDTWik detection process excludes the perspective of a topic, or multi-topic, guided (or semi-supervised) event detection approach. As a result, some interesting narrowly focused events are not detected as they are weakly relevant in a broader context (e.g., Wikipedia) although acquiring relevance within a conditioned context. Therefore, there is a need for an adaptive perspective where data is to be analysed against a set of narrower topics of interest. This paper shows that SEDTWik gains expressive power after being extended with multi-topic semi-supervision. The evaluation of the current proposal uses the well-known corpora with labeled events, Events2012. In the Events2012 dataset used notation category for events, meaning that events are combined by a certain topic. SEDTWik with topic dictionaries was checked across all categories. In the main part of the article, it is also explained the process of topic dictionary construction from Events2012 labeled tweets. At this stage of the research, in all tasks unigrams were used. SEDTWik with dictionaries showed improved accuracy, and more events were found within a certain category

Studying the graphite phase in antifriction AChS-2 cast iron

The paper presents the data of studying the characteristics of graphite inclusions in various samples of AChS-2 cast iron. The metallographic analysis was carried out using the Thixomet Pro software, the length of the graphite inclusions, their shape and the occupied area were estimated. The slip coefficient and hardness were measured on the same samples. It was found that the characteristics of the graphite phase affect the antifriction properties of the alloy

Studying the graphite phase in antifriction AChS-2 cast iron

The paper presents the data of studying the characteristics of graphite inclusions in various samples of AChS-2 cast iron. The metallographic analysis was carried out using the Thixomet Pro software, the length of the graphite inclusions, their shape and the occupied area were estimated. The slip coefficient and hardness were measured on the same samples. It was found that the characteristics of the graphite phase affect the antifriction properties of the alloy

Investigation of heat-resistant properties and microstructure of experimental steel based on the Cr-Ni-Ti-Nb system obtained under industrial conditions

The Nb effect on long-term strength of Cr18Ni10Ti steel is considered. There is substantiated selecting this steel for obtaining cast parts for metallurgical furnaces. It is shown that introduction of Nb in the amount of 1 % into steel of a given composition increases tensile strength and long-term strength by 15 %. Improving the properties is associated with the formation of NbC carbides

Studying the chrome-nickel cast iron structure and properties after modification on industrial samples

The paper presents the results of studying the structure and properties of chrome-nickel cast iron samples obtained under production conditions. Cast iron with a given ratio of silicon and chromium smelted in an industrial arc furnace was treated with titanium carbide followed by modification with a complex modifier containing (Scanning electron microscope). As a result of the composition adjustment and appropriate processing, a mixed structure was formed represented by an austenite-ledeburite matrix, iron, chromium and titanium carbides and a small amount of free graphite, both lamellar and spherical. This structure is characterized by higher wear resistance and impact resistance compared to Nihard-2 but at the same time it shows lower hardness

Studying the chrome-nickel cast iron structure and properties after modification on industrial samples

The paper presents the results of studying the structure and properties of chrome-nickel cast iron samples obtained under production conditions. Cast iron with a given ratio of silicon and chromium smelted in an industrial arc furnace was treated with titanium carbide followed by modification with a complex modifier containing (Scanning electron microscope). As a result of the composition adjustment and appropriate processing, a mixed structure was formed represented by an austenite-ledeburite matrix, iron, chromium and titanium carbides and a small amount of free graphite, both lamellar and spherical. This structure is characterized by higher wear resistance and impact resistance compared to Nihard-2 but at the same time it shows lower hardness

Activity features of catalysts for thermocatalytic hydrogenation processing of polymer waste

The aim of this study was to obtain new catalysts for the processing of carbon-containing polymer waste based on polyethylene and polypropylene, represented mostly by lids from beverages bottled in plastic containers, which accumulate in huge quantities in landfills, by the method of thermocatalytic hydrogenation into liquid fuels and other products. The process was carried out in the presence of fuel oil as a binder, a source of hydrogen and additional hydrocarbons. Thus, two tasks can be solved simultaneously: recycling the polymer waste and obtaining the alternative raw materials from the polymer waste in order to save resources and improve the environmental situation in general. New catalysts based on activated zeolite modified with Mo(VI) and W(VI) salts of various concentrations for the thermocatalytic hydrogenation processing of waste plastics into motor fuels were synthesized. The composition, structure, morphology and adsorption properties of the catalysts were determined by different physicochemical methods. The suitability of the obtained catalysts for use in the thermocatalytic hydrogenation processing of plastic waste into fuels was determined. The catalysts were tested during the processing of a mixture of polyethylene-polypropylene: a paste-forming agent (fuel oil) at T=450 °C and a pressure of 0.6 MPa. The individual and group composition of gasoline, diesel and gas oil fractions was determined by chromatography coupled with mass spectrometry. The maximum yield of the gasoline fraction (16.9 wt.%) and diesel fraction (39.31 wt.%) was obtained on a 2%W(VI)/diatomite catalyst

Phase Composition and Structure-Formation of the Low-Clinkered Floured Cements

We have carried out studies on the production of low-clinkered floured cements (LCFC) on the basis of natural and technogenic waste. The research on optimizing the compositions, strength, durability and performance properties of low-clinkered floured cements (LCFC) was carried out. Therefore, we studied the new products in the process of hydration of mechanically activated multi-component cements in the presence of technogenic wastes of the industry (waste of limestone crushing at opencast mines, metallurgical and phosphoric slag) and surface-active reagents (SAR) (superplasticizer S-3); as well as the development of compositions of high-strength and technological sorts of cement concretes. Thus, the low-clinkered floured cements developed by us based on industrial technogenic waste that meet the modern requirements, i.e. they improve physical-mechanical characteristics of the material and positively influence the ecological situation and allow decreasing the cost of final product. The physico-chemical research of the processes of hydration of low-clinkered floured cements with additive of superplasticizer S-3 were carried out by modern methods using X-ray diffract-meter D8ADVANCE (Bruker company) with Cu-radiation and synchronous thermo-analyzer STA 409 PC Luxx (Netzsch, Germany) at exposure mode of 10 Вє/min in the platinum crucibles in the air conditions