Search results

Filters

  • Journals
  • Keywords
  • Date

Search results

Number of results: 4
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

This paper describes comminution processes using the theories of limiting states, elasticity, and plasticity to explain some effects observed in the process of crushing brittle materials. It further describes the phenomena occurring during crushing in high-pressure roll presses and analyzes the effects of selected factors upon crushing results. The evaluation of the usefulness of various hypotheses for interpretation of the crushing process in the high-pressure grinding roll was carried out by means of experimental investigations. A series of laboratory crushing tests were also conducted in which limestone samples were pressed in a hydraulic piston-die press. Comminution conditions in this press are similar to those observed in the working chamber of HPGR presses. The limestone aggregate, placed in a steel cylinder, was exposed to pressure exerted by the stamp of the press. Samples had various particle size distributions, and experiments were conducted for two values of pressing force. Operating pressure was the main parameter influencing the obtained comminution effects, but the particle size distribution also has an impact on the process effects. A comparison of the results of the investigations indicated that there exists a significant potential for adjusting the operational parameters of high-pressure grinding rolls. Internal stresses are a derivate of crushing actions such as compression, impact, bending, and shearing. The result of crushing in a particular crusher depends on the strength properties of particles reacting to a specific type of crushing actions. In every crusher there are many crushing actions out of which one is dominating due to the crusher type. Impact is a dominating factor in impact or hummer crushers. Various actions of crusher elements on the crushed material are beneficiary. For example, the shape of the jaw surface in jaw crushers, cone surface in cone crushers, or roll surface in roll presses are important.

Go to article

Authors and Affiliations

Marian Brożek
Zdzisław Naziemiec
Download PDF Download RIS Download Bibtex

Abstract

The article studies the problems of forming intentional deformations of a narrative category of event in the prose of a famous Russian absurdist of the 1920s‑30s, a member of the avant‑garde collective Oberiu – Daniil Kharms. The study defines the main regularities of generating “normal” textual events as well as the mechanisms for their deformations and destructions within a narrative “story” and its “discourse”. The most important reasons for the “ludic” absurdity of events within D. Kharms’ short stories are the unintelligibility of the described objects, the ontological absurdity of the objects of events, the absurdity of the heroes’ behaviour and thinking, the sequence (multiplication) of events, the violation of structural order and the integrity of the described objects and their constituents, among others. The absurdization of events in the narrative “discourse” is presupposed by a set of semantic and pragmatic devices, in particular: the author’s assumed inability to create an event’s manoeuvring or to build the plot; the violation of the logic of the development of the plotline; making the modus and modality elements of the story weird; shifting points of view and their focuses, to name a few. The author’s intentional deviations within the “story” and the “discourse” of the belles‑lettres narrative cause communicative senses characteristic for an absurd type of writing: the senses of mental “charming”, which border on the reader’s cognitive “stupor”, as well as numerous senses of an evaluative and ludic character generated by the common “background” of the reader’s consciousness and borrowed, so to say, from “standard” belles‑lettres text types and narratives. The article outlines the perspectives of lingual‑narrative studies into weird (absurd, in particular) belles‑lettres texts.
Go to article

Authors and Affiliations

Флорій Бацевич
1
ORCID: ORCID

  1. Львівський університет імені Івана Франка
Download PDF Download RIS Download Bibtex

Abstract

Profiles of the three Polish humanists as remembered by prof. Michał Głowiński.
Go to article

Authors and Affiliations

Michał Głowiński
1 2

  1. członek rzeczywisty PAN
  2. Instytut Badań Literackich PAN, Warszawa

This page uses 'cookies'. Learn more