Investigation of the accuracy of simultaneous 5-drilling holes in the vertical position - drill press mod. 2N150 with the development of the special design of the drill head

Анотація до дипломної роботи Веселовського В.В. на тему: "Дослідження точності одночасного свердління 5-ох отворів на вертикально - свердлильному верстаті мод. 2Н150 з розробленням конструкції спеціальної свердлильної головки"Створенно конструкцію багатошпиндельниї свердлильної головки для сверд-лильного верстата та досліджено точність її робот

A Ministry of Agriculture Perspective on the Farmer Information and Advisory Service in the Russian Agricultural and Food Sector

This project utilized a network of 300 agricultural specialists, a network of rural radio stations, and an Internet backbone agricultural information archive to develop an innovative new agricultural and rural development communication system for Russia. Experts were encouraged to share their research findings and field recommendations with the project, and in return they received a quarterly packet that included similar recommendations from the other experts. Rural radio stations were given raw scripts or taped program materials via CDs or Internet links for local broadcasting, and in return were asked to send the project copies of local scripts they developed and broadcast. The overall project was coordinated by Moscow State University, but also collaborated with and shared radio script information with the Press Video Center of the Ministry of Agriculture. By the project’s fifth year, the Internet site was receiving more than 1 million site visits per month. One innovative aspect of the project was a feedback form placed into each quarterly packet. Responses were received from 30 percent of recipients. Project staff found that recipients were willing to fill out very detailed feedback forms if they perceived that this would influence future materials they would receive

Analysis of several aspects of Russian technical regulation reform

Paper provides analysis of Russian technical regulation reform. Several questions of reform realization, which on our opinion, are of the primary importance, are taken within the focus of research. These are: national standards of old system (GOSTs) and international standards, involvement in reform of production companies, potential gains due to reduction of trade costs.technical regulations, Russia, GOST

Reddit in the Time of COVID

When the COVID-19 pandemic hit, much of life moved online. Platforms of all types reported surges of activity, and people remarked on the various important functions that online platforms suddenly fulfilled. However, researchers lack a rigorous understanding of the pandemic's impacts on social platforms, and whether they were temporary or long-lasting. We present a conceptual framework for studying the large-scale evolution of social platforms and apply it to the study of Reddit's history, with a particular focus on the COVID-19 pandemic. We study platform evolution through two key dimensions: structure vs. content and macro- vs. micro-level analysis. Structural signals help us quantify how much behavior changed, while content analysis clarifies exactly how it changed. Applying these at the macro-level illuminates platform-wide changes, while at the micro-level we study impacts on individual users. We illustrate the value of this approach by showing the extraordinary and ordinary changes Reddit went through during the pandemic. First, we show that typically when rapid growth occurs, it is driven by a few concentrated communities and within a narrow slice of language use. However, Reddit's growth throughout COVID-19 was spread across disparate communities and languages. Second, all groups were equally affected in their change of interest, but veteran users tended to invoke COVID-related language more than newer users. Third, the new wave of users that arrived following COVID-19 was fundamentally different from previous cohorts of new users in terms of interests, activity, and likelihood of staying active on the platform. These findings provide a more rigorous understanding of how an online platform changed during the global pandemic.Comment: 12 pages, published in ICWSM 202

The Amplification Paradox in Recommender Systems

Automated audits of recommender systems found that blindly following recommendations leads users to increasingly partisan, conspiratorial, or false content. At the same time, studies using real user traces suggest that recommender systems are not the primary driver of attention toward extreme content; on the contrary, such content is mostly reached through other means, e.g., other websites. In this paper, we explain the following apparent paradox: if the recommendation algorithm favors extreme content, why is it not driving its consumption? With a simple agent-based model where users attribute different utilities to items in the recommender system, we show through simulations that the collaborative-filtering nature of recommender systems and the nicheness of extreme content can resolve the apparent paradox: although blindly following recommendations would indeed lead users to niche content, users rarely consume niche content when given the option because it is of low utility to them, which can lead the recommender system to deamplify such content. Our results call for a nuanced interpretation of ``algorithmic amplification'' and highlight the importance of modeling the utility of content to users when auditing recommender systems. Code available: https://github.com/epfl-dlab/amplification_paradox.Comment: Accepted at ICWSM'23 please cite accordingl

Integrated numerical modelling of a polyhistory basin, Southern Cantabrian Basin (Palaeozoic, NW-Spain)

In order to model highly deformed sedimentary basins, structural balancing must be carried out prior to 2D reverse basin and 2D stratigraphic forward modelling. This study investigates the Southern Cantabrian Basin, which is the Variscan foreland fold-and-thrust belt of NW Spain. Structural balancing offers approximations of predeformational, spatial relationships between measured cross-sections. It provides information about minimal basin shortening and Late Devonian basin geometry. Three different structural domains can be distinguished along the synthetic, 18km long Bernesga Transect. The style of structural deformation defines the amount of shortening calculated for each domain. The Pedrosa domain has the highest values of up to 65%, followed by the northern Bodón (41%) and the southern Alba (25%) domains. Thrusting and folding each cause approximately the same amount of shortening. At basin scale, the amount of total shortening of the deformed basin infill is 54% at minimum, excluding small-scale faulting and folding. 2D numerical reverse basin modelling is used to estimate the basin architecture development and to establish thermo-tectonic subsidence rates as initial numerical input for the subsequent 2D stratigraphic forward modelling. Six major subsidence trends within the total subsidence rates and its components (thermo-tectonic, flexural-induced and compaction-induced) can be distinguished between 560Ma and 313Ma. These trends reflect a complex evolution from a rift stage, to a post-rift stage (passive continental margin) and finally to a foreland basin, governed by the approach of the Variscan Orogen in the Lower Carboniferous. The rift stage is characterised by decreasing thermo-tectonic subsidence rates until the Middle Cambrian. The time that follows (Late Cambrian until Late Ordovician) is marked by periods of tectonic quiescence and activity, until the passive continental margin established in the Silurian. The post-rift stage is represented by two second-order encroachment subcycles with durations of 20Ma and 41Ma respectively. They result from subsidence patterns and basinward shifts of regional onlap. Maximum marine flooding was reached during Early Llandoverian. The Variscan foredeep stage is characterised by a highly subsiding depocenter, which moves from S to N in time (present day coordinates). This movement reflects the propagation of the Variscan Orogen, with velocities ranging between 4 and 12km/Ma. 2D stratigraphic forward modelling visualises the predicted depositional history along the synthetic Bernesga Transect and quantifies the physical factors determining deposition. From the latest Neoproterozoic to the Early Ordovician the Southern Cantabrian Basin is dominated by a considerable flux of siliciclastic sediments (2600 to 4600m^2/ka). Following a substantial drop in siliciclastic input by more than 65% at the end of Silurian, significant carbonate production started in the Early Devonian. The Devonian is marked by alternating periods of considerable siliciclastic flux rates (2500 to 4600m^2/ka) and prolific carbonate production. Three Devonian carbonate factories (Abelgas, Santa Lucía and Portilla formations) display decompacted carbonate production rates from 90 to 780m/Ma, each depending on (i) amount of siliciclastic input, (ii) accommodation space available and (iii) palaeogeographic position of the depositional area. The production and destruction of accommodation space is governed by differential thermo-tectonic and flexural-induced subsidence, along with fluctuating eustatic sea-level and sediment flux. Due to increased siliciclastic influx and diminishing accommodation space, the decompacted carbonate production rates of the Portilla Fm. dropped by 81% in comparison to the Santa Lucía Fm