scholarly journals Solution for the Location of Rock Cutting Elements Relative to the Rotation Center of Geohod

2019 ◽  
Vol 105 ◽  
pp. 03001 ◽  
Author(s):  
Valery Nesterov ◽  
Vladimr Aksenov ◽  
Vladimir Sadovets ◽  
Dmitry Pashkov
Keyword(s):  
Cutting Forces ◽  
Complex Shape ◽  
Rock Cutting ◽  
General Information ◽  
Technical Solution ◽  
Helical Surface ◽  
Body Form ◽  
Rotation Center ◽  
Different Types ◽  
The Face

The article presents the technical solution for the location of cutting elements relative to the rotation center of Geohod for destructing rocks with a strength up to 1 of Protodyakonov hardness. The relevancy of the research is considered. General information about Geohod is given. The features of working body of Geohod are described, in particular, the formation of a complex shape of the face and the working body, and it is also said that in the case of screw movement of working body of Geohod to the face, the points of working body form a helicoidal (helical) surface. To set the purpose and objectives of the study the geometric parameters of generatrix are justified. The parameter depending on the number of blades and on the radius of location of the blade’s cut is identified. Based on the study, the dependence of the number of blades on their location from the center to the periphery is determined. The design of blade working body of Geohod for rocks with a strength f <1 of Protodyakonov hardness is offered. Also the directions for further research have been identified, which include: the development of methods for calculating cutting forces for a technical solution for the location of cutting elements relative to the center of rotation of Geohod for destructing rocks up to 1 of Protodyakonov hardness; the application of this technique for obtaining variants of the blade working body of Geohod of different types.

scholarly journals Not all biases are bad: equitable and inequitable biases in machine learning and radiology

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Mirjam Pot ◽  
Nathalie Kieusseyan ◽  
Barbara Prainsack
Keyword(s):  
Machine Learning ◽  
Human Error ◽  
Technical Problem ◽  
Social Dimension ◽  
Patient Treatment ◽  
Technical Solution ◽  
Negative Effects ◽  
Different Types ◽  
Human Decision

AbstractThe application of machine learning (ML) technologies in medicine generally but also in radiology more specifically is hoped to improve clinical processes and the provision of healthcare. A central motivation in this regard is to advance patient treatment by reducing human error and increasing the accuracy of prognosis, diagnosis and therapy decisions. There is, however, also increasing awareness about bias in ML technologies and its potentially harmful consequences. Biases refer to systematic distortions of datasets, algorithms, or human decision making. These systematic distortions are understood to have negative effects on the quality of an outcome in terms of accuracy, fairness, or transparency. But biases are not only a technical problem that requires a technical solution. Because they often also have a social dimension, the ‘distorted’ outcomes they yield often have implications for equity. This paper assesses different types of biases that can emerge within applications of ML in radiology, and discusses in what cases such biases are problematic. Drawing upon theories of equity in healthcare, we argue that while some biases are harmful and should be acted upon, others might be unproblematic and even desirable—exactly because they can contribute to overcome inequities.

scholarly journals Approaches to the Mechanical Properties of Threaded Studs Welded to RHS Columns

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1429
Author(s):  
Ismael García ◽  
Miguel A. Serrano ◽  
Carlos López-Colina ◽  
Fernando L. Gayarre ◽  
Jesús M. Suárez
Keyword(s):  
Mechanical Properties ◽  
Tensile Tests ◽  
Efficient Solutions ◽  
Bolted Joints ◽  
Building Structures ◽  
Static Behavior ◽  
Steel Tubes ◽  
Punch Test ◽  
Different Types ◽  
The Face

The use of Rectangular Hollow Sections (RHS) as columns in steel construction includes important advantages like higher mechanical strength and fire resistance. However, the practical demountable bolted joints between beams and columns are not easy to execute, due to impossibility of access to the inner part of the tube. The use of threaded studs welded to the face of the tube and bolted to the beam by means of angle cleats is one of the cheaper and most efficient solutions to obtain beam–column joints with a semi-rigid behavior, as is usually sought in building structures. Nevertheless, it is important to point out that the stud-diameter and the stud-class selection may affect the mechanical properties of the welded parts of the joint. In this paper, 8MnSi7 (with a commercial designation K800) and 4.8 threaded studs were welded to RHS steel tubes and mechanical properties on the weld, the Heat Affected Zones (HAZ), and the base metal were obtained in two different ways: through a correlation with the Vickers hardness and by means of the Small Punch Test (SPT). A study of the microstructure and tensile tests on the threaded studs and in the columns was also carried out. The research involved different types of stud qualities, tube wall thicknesses, and stud diameters. The work presented in this paper proved that in most cases, the welded joint between these studs and the RHS steel tubes present a reasonable static behavior that fulfils the requirements for the beam–column joints under static loading.

Intellectually Virtuous Inquirer and the Practical Value of Truth

2021 ◽  
Vol 58 (4) ◽  
pp. 54-59
Author(s):  
Sergei M. Levin ◽  
Keyword(s):  
Prima Facie ◽  
Epistemic Value ◽  
Practical Reasons ◽  
Circular Reasoning ◽  
Duncan Pritchard ◽  
Different Types ◽  
The Face

Veritism is the thesis that the truth is the fundamental epistemic good. According to Duncan Pritchard, the most pressing objections to veritism are the trivial truths objection and the trivial inquiry problem. The former states that veritism entails that trivial truths are as important as deep and important truths. The latter is a problem that a veritist must prefer trivial inquiry that generates many trivial truths to the serious inquiry with the hope but no guarantee to discover some deep and important truth. Both objections arise from the inability of veritism prima facie to properly rate the different types of truths. Pritchard's solution is to approach the truth from the perspective of the intellectually virtuous inquirer who would prefer weighty truth over trivial truth. In my commentary, I criticise the proposed solution as circular reasoning. The necessary virtue for an intellectually virtuous inquirer is that they would prefer the weighty truth over the trivial one and at the same time, the weighty truth is superior because it is the goal for intellectually virtuous inquirer. I suggest another path to substantiate veritism in the face of the two sibling objections. I argue that truth is the fundamental epistemic good as it makes the epistemic realm practically valuable more than any other epistemic good. The weighty truths are preferable to the trivial ones because the practical value of the deep and important truths is usually higher. The suggested path goes away from the attempts to prove the epistemic value of truth only within the epistemic realm, yet I argue it does not compel the intellectually virtuous inquirer to seek the truth only for the sake of practical reasons.

Fractured and Effaced Façades

2021 ◽  
pp. 162-185
Author(s):  
Ron J. Popenhagen
Keyword(s):  
Sensory Deprivation ◽  
The Body ◽  
Human Form ◽  
Antonin Artaud ◽  
Body Form ◽  
Dynamic Expression ◽  
Marc Chagall ◽  
Dynamic Form ◽  
The Face ◽  
Involuntary Displacement

The rise of Fascism in Europe and its aftermath rest ever in the background of Chapter Six and its collection of ‘Disfigured Bodies’. The face and gaze of Antonin Artaud best characterises the tone of this series of violent destructions, lost ones and the isolated (like Picasso in occupied Paris). Amid ‘Veiled and Displaced Faces’ and ‘Empty Gazes’, involuntary displacement and sensory deprivation haunt representations of the human form. The head and human figures presented here are almost unrecognisable when re-conceived by a metteur en scène like Étienne Decroux or a sculptor like Alberto Giacometti. Marc Chagall, in exile, invents fantasy forms that masquerade the figures of opera and ballet performers with colourful, cushioned exteriors in magical scenographic spaces. Experimentation with actor as object manipulator or manipulacteur, like the scenographic, dynamic form in some of Jacques Lecoq’s work, displace dynamic expression to ‘things’ outside of the body form itself. In Chapter Six, some non-verbal performers search for statements beyond language: texts in the materiality of space itself. The abstracted silhouette speaks as depersonalised, masquerading image.

15. Democracies, Democratization, and Authoritarian Regimes

2020 ◽  
pp. 336-362
Author(s):  
Peter Ferdinand
Keyword(s):  
Economic Development ◽  
Recent Literature ◽  
Authoritarian Regimes ◽  
Short Term ◽  
National Crisis ◽  
Different Types ◽  
Types Of Democracy ◽  
The Face ◽  
Long Term Trends

This chapter focuses on democracies, democratization, and authoritarian regimes. It first considers the two main approaches to analysing the global rise of democracy over the last thirty years: first, long-term trends of modernization, and more specifically economic development, that create preconditions for democracy and opportunities for democratic entrepreneurs; and second, the sequences of more short-term events and actions of key actors at moments of national crisis that have precipitated a democratic transition — also known as ‘transitology’. The chapter proceeds by discussing the different types of democracy and the strategies used to measure democracy. It also reviews the more recent literature on authoritarian systems and why they persist. Finally, it examines the challenges that confront democracy in the face of authoritarian revival.

Politeness strategies and the representation of women in the Holy Qur’an

2018 ◽  
Vol 15 (3) ◽  
pp. 409-435
Author(s):  
Kawakib Al Momani ◽  
Fathi Migdadi ◽  
Eman Rabab’a
Keyword(s):  
Qualitative Approach ◽  
Cross Cultural ◽  
The Other ◽  
Representation Of Women ◽  
Different Types ◽  
Social Unity ◽  
Politeness Strategies ◽  
The Face ◽  
Negative Face ◽  
Sensitive Issues

Abstract The goal of this study is to examine the strategies of politeness used in the Qur’an, the holy book of Muslims, to address and represent women. Women have been represented negatively in many different types of texts through face-threatening acts that sustain masculine power and hegemony. This study attempts to investigate the image of women in the most sacred book of Muslims. Two aspects are examined herein: the representation of women in relation to sensitive issues like sex and marriage, and the forms of address and reference to women. A qualitative approach is used to provide interpretations of the hidden meanings in the selected excerpts, adopting Brown and Levinson’s theory of politeness and Leech’s maxims of politeness as the guides for the analysis. The analysis has revealed that women all through Qur’an have been addressed and referred to decently and politely. Unlike most of the other topics where bald-on-record strategies are used, the use of off-record strategies and positive and negative face strategies of politeness have been found to be dominant in discussion of issues relevant to women. These strategies have been used to avoid unpleasant communication in spiritual issues, and also to avoid misrepresentation of women, demeaning of their persons, causing any embarrassment, and thereby saving the face of both women and recipients. However, bald-on-record strategies are sometimes used in topics related to legal matters concerning familial and social unity and solidarity. The analysis has demonstrated the means by which language is used in the Glorious Qur’an to courteously address women. Concerning interpersonal maxims, the approbation, modesty, sympathy, tact, and agreement maxims have shown to be evident in addressing and referring to women. This study will contribute to the field of pragmatics and will lead to cross-religious and cross-cultural understanding during a period where Islam and its teachings are being widely questioned and examined.

The dynamics of autocratic coercion after the Cold War

2006 ◽  
Vol 39 (3) ◽  
pp. 387-410 ◽  
Author(s):  
Lucan A. Way ◽  
Steven Levitsky
Keyword(s):  
Cold War ◽  
High Intensity ◽  
The State ◽  
Intensity Measures ◽  
Post Cold War ◽  
Low Intensity ◽  
Regime Stability ◽  
State Apparatus ◽  
Different Types ◽  
The Face

This article examines coercive capacity and its impact on autocratic regime stability in the context of post-Soviet Armenia, Belarus, Georgia, and Ukraine. In the post-Cold War era, different types of coercive acts require different types of state power. First, high intensity and risky measures – such as firing on large crowds or stealing elections – necessitate high degrees of cohesion or compliance within the state apparatus. Second, effective low intensity measures – including the surveillance and infiltration of opposition, and various forms of less visible police harassment – require extensive state scope or a well-trained state apparatus that penetrates large parts of society. Coercive state capacity, rooted in cohesion and scope, has often been more important than opposition strength in determining whether autocrats fall or remain in power. Thus, the regime in Armenia that was backed by a highly cohesive state with extensive scope was able to maintain power in the face of highly mobilized opposition challenges. By contrast, regimes in Georgia where the state lacked cohesion and scope fell in the face of even weakly mobilized opposition. Relatively high scope but only moderate cohesion in Belarus and Ukraine has made autocratic regimes in these countries generally more effective at low intensity coercion to prevent the emergence of opposition than at high intensity coercion necessary to face down serious opposition challenges.

A Quantitative Sensitivity Analysis of Cutting Performances in Orthogonal Machining with Restricted Contact and Flat-Faced Tools

2004 ◽  
Vol 126 (2) ◽  
pp. 408-411
Author(s):  
Ning Fang
Keyword(s):  
Sensitivity Analysis ◽  
Slip Line ◽  
Cutting Forces ◽  
Chip Thickness ◽  
Contact Length ◽  
Machining Parameters ◽  
Flow Angle ◽  
Orthogonal Machining ◽  
Different Types ◽  
Machining Operations

This paper presents a new quantitative sensitivity analysis of cutting performances in orthogonal machining with restricted contact and flat-faced tools, based on a recently developed slip-line model. Cutting performances are comprehensively measured by five machining parameters, i.e., the cutting forces, the chip back-flow angle, the chip up-curl radius, the chip thickness, and the tool-chip contact length. It is demonstrated that the percentage of contribution of tool-chip friction to the variation of cutting performances depends on different types of machining operations. No general conclusion about the effect of tool-chip friction should be made before specifying a particular type of machining operation and cutting conditions.

scholarly journals Senate Treatment of Select International Agreements, 2013–2018

AJIL Unbound ◽  
2019 ◽  
Vol 113 ◽  
pp. 184-188
Author(s):  
Margaret L. Taylor
Keyword(s):  
Foreign Relations ◽  
Mind Wandering ◽  
Executive Branch ◽  
International Agreements ◽  
Political Dynamics ◽  
Capitol Hill ◽  
Different Types ◽  
The Face ◽  
Executive Agreements ◽  
Paris Climate Agreement

When I finished reading Julian Nyarko's “Giving the Treaty a Purpose: Comparing the Durability of Treaties and Executive Agreements,” I found my mind wandering through memories of the more than five years I spent working on Capitol Hill as Counsel for the Senate Foreign Relations Committee (SFRC)—a role that often required me to figure out how best to preserve the constitutional prerogatives of Congress in the face of the various types of international agreements the executive branch produced. This essay recounts my impressions of how the Senate handled different agreements in the 2013–2018 timeframe—Article II treaties, the Paris Climate Agreement, and the Iran Nuclear Agreement. Unlike Professor Nyarko's ambitious and impressive work to categorize and statistically analyze the durability of Article II treaties and executive agreements—which I applaud and find useful—this essay is modest in purpose. I contend that how Congress handles different types of agreements is largely a product of specific political dynamics—including political ownership, policy entrepreneurism, and electoral risk—that can be unpredictable. Because of these dynamics, the differences that Nyarko reveals regarding the durability of Article II treaties and executive agreements are unlikely to produce a significant change in official practice.

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