Increasing the Efficiency of Milling Stainless Steels by Using Lubricating-Cooling Technological Medium

This article considers the possibility of increasing the efficiency of end milling by using a modified lubricating-cooling technological medium, based on a water-miscible cutting fluid. The conditions for the effective use of modified coolant in processing stainless steels ensuring a decrease in cutting forces and therefore a decrease in vibrations, which contributes to an increase in the quality of manufactured products have been determined. A decrease in cutting forces is due to the presence of oleic acid in the modified cutting fluid, containing surfactants, forming a dense lubricating film on the surface of the cutting tool. When mixing oleic acid in a water-miscible cutting fluid, a special soap solution significantly improving the solubility is used. However, over time, stratification of liquids occurs. To ensure the homogeneity of the medium, a special device has been developed that allows continuous mixing of the compositions, due to the presence of impellers with differently oriented blades. To save a lubricant, the technology of minimum lubrication was used, which allows the lubricant to be supplied to the cutting zone in portions (dosed) using the Noga Minicool device.

On Online Practices of Hospitality in Higher Education

This article contributes to conversations on hospitality in educational settings, with a focus on higher education and the online context. We integrate Derrida’s ethics of hospitality framework with a focus on practices of hospitality, including its affective and material, embodied dimension (Zembylas: Stud Philos Educ 39:37–50, 2019). This article offers empirical examples of practices of what we termed ‘virtual academic hospitality’: during a series of online collaborative and cross borders workshops with teachers of English based in the Gaza Strip (Palestine), we performed academic hospitality through virtual convivial rituals and the sharing of virtual gifts, which are illustrated here. We propose a revision of the concept of academic hospitality arguing that: firstly, academic hospitality is not limited to intellectual conversations; secondly, that the relationship between hospitality and mobility needs to be revised, since hospitality mediated by the technological medium can be performed, and technology may even stretch hospitality towards the unreachable ‘unconditional hospitality’ theorised by Derrida (Of hospitality: Anne Dufourmantelle invited Jacques Derrida to respond. Stanford University Press, Stanford, 2000); and thirdly, that indigenous epistemics, with their focus on the affective, may offer alternative understandings of conviviality within the academy. These points may contribute to the collective development of a new paradigmatic understanding of hospitality, one which integrates Western and indigenous traditions of hospitality, and which includes the online environment.

COVID times make ‘deep listening’ explicit: changing the space between interviewer and participant

This article draws on the research project Post-abortion narratives shared by Perth women via face-to-face interviews. The project was subsequently disrupted by the arrival of COVID-19 in Perth, Australia, making it necessary to conduct interviews via video call. The experience of using an online platform to conduct interviews became an opportunity to consider more carefully the practice of ‘deep listening’. This kind of listening involves creating an emotional connection with the participant so that the interviewer is able to hear multiple layers of meaning and context. It includes listening mixed with perception in which one can hear the emotions of the other. In a paradigm where the interview is seen as an interaction between two embodied individuals and the interviewer herself is the instrument of research, this article examines the communication that occurs in the space between two co-present, embodied individuals and explicates the practice of deep listening. While interviewing via video call is an excellent tool, I argue that a layer of meaning is removed by the technological medium, which impacts the researcher relationship and thus the ability to listen deeply.

“Mike Fright”

This chapter examines the racialization of sound and language during the transitional period in Hollywood. It argues that the studios’ interest in African American representation in the talkies participated in the ongoing construction in US popular culture of the “Black voice” and of ethnically marked ways of speaking as signifiers of substance and vitality. Tracing the genealogy of this “thrown” voice back through white radio comedians’ vocal mimicry, dialect fiction written by white authors, and blackface minstrelsy, the chapter demonstrates that the talkies were a technological medium of racial ventriloquism. Examining the popular RKO feature Check and Double Check (1930)—a complex product both of radio minstrelsy and the early sound era “vogue” for African American musical performance—the chapter centers on a highly revealing gesture of counter-ventriloquism by the members of the Duke Ellington Orchestra, who refuse to adopt the thrown “Black voice” scripted for them, appropriating white singers’ voices instead.

Formation of Residual Stresses during Discontinuous Friction Treatment

The tool with grooves on its working surface is used to improve the properties of the strengthened layer. This allows us to reduce the structure’s grain size and increase the thickness of the layer and its hardness. Mineral oil and mineral oil with active additives containing polymers are used as a technological medium during friction treatment. It is shown that the technological medium used during the friction treatment affects the nature of the residual stresses’ distribution. Thus, when using mineral oil with active additives containing polymers, residual compressive stresses are more significant in magnitude and depth than when treating mineral oil. The nature of the residual stresses diagram depends on the treated surface’ shape. After friction treatment of cylindrical surfaces, the highest compressive stresses near the treated surface decreases with depth. And after friction treatment of flat surfaces near the treated surface, the compressive stresses are small. They increase with depth, pass through the maximum, and then decrease to the original values. The technological medium used during friction treatment affects residual stresses in the grains and in the crystal lattice.

Winning the Digital War: Cyber Ideology and the Spectrum of Conflict

Cyberspace allows ideology to dictate who wins a war. That technological medium has marginalized violence to such an extent that a belligerent must make a cognitive effort a priority. That focus means humanity has at last reached a coveted threshold where ideas determine a war’s outcome. This article traces that evolution along the “spectrum of conflict,” a military categorization encompassing all of war. This act of reductionism must confront cyber realities that alter an understanding of war as one driven by acts of violence. This feat means a digital peace finds an equal footing with war arising from a cyber ideological conflict. That conflict rests on cyber rebellions derived from an online interface contested in content but able to withstand the pull of government oversight. Stripped of violence as an absolute defining war, cognitive war becomes of paramount importance as a broad intellectualism compels a state of war. Ideology comes less from a meaning shaped by political context and more from online access impacting political norms. This contest in cyberspace means winning the digital war requires an open interface to pressure authoritarian regimes into reform, all the while allowing for much of this same friction that arises in states favoring democracy. Finding that balance arrests the endless process of war as the chief means of human interaction.

TRENDS IN THE PROCESS OF GREENING LUBRICANTS

In this article, the authors have characterized the main activities that reduce the impact of lubricants on the environment. To begin with, new solutions in the area of engine oils that reduce the emission of harmful substances in exhaust gases (“Low SAPS” oils) were discussed. Next, the activities concerning the improvement of biodegradability of lubricating oils used in devices in Nature Reserves, as well as in all of the “open lubrication systems” were characterized. Another problem was related to the non-toxicity (and other derivative features) of lubricants that may have incidental contact with a sensitive technological medium in production processes (in the food, pharmaceutical, and cosmetics industries). The last issue that was discussed concerns the compatibility of compressor oils with refrigerants in connection with the global exchange program of Freon for more environmentally friendly substances (currently, mainly affecting global warming to a lesser extent).