Eric R. Marsh and Byron R. Knapp
The need for an instrumented grinding system that addresses the requirements of ductile regime machining of brittle materials is implemented. The static and dynamic stiffness of…
Abstract
Purpose
The need for an instrumented grinding system that addresses the requirements of ductile regime machining of brittle materials is implemented. The static and dynamic stiffness of the structural loop of the grinding system meets or exceeds those of previous researchers. An instrumented spindle is introduced which features capacitance gages embedded in the stator of an air bearing spindle.
Design/methodology/approach
The instrumented spindle is demonstrated to provide valuable force feedback for fine grinding and is capable of resolving intra‐revolution force components. Tests are performed to demonstrate the use of the instrumented spindle for ductile grinding of brittle materials with superabrasive wheels.
Findings
The results of the test show that the instrumented spindle is capable of determining intra‐revolution force components for square alumina‐titanium carbide wafers.
Originality/value
Outlines some important work developing and building instrumented spindles to aid the precision grinding industry.
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Eric Marsh, David Arneson, Matthew Van Doren and Scott Blystone
The purpose of this paper is to show how an ultra‐precision manufacturing process (flycutting) can be improved through interferometry.
Abstract
Purpose
The purpose of this paper is to show how an ultra‐precision manufacturing process (flycutting) can be improved through interferometry.
Design/methodology/approach
The paper presents a theoretical model of the machine tool cutting system and then uses interferometer measurements to validate the results. The model is then used to show some general findings relating process conditions to workpiece quality.
Findings
A realistic cutting model can predict the workpiece flatness with excellent accuracy and closely match interferometer measurements. The process parameters in precision flycutting should be chosen such that the flycutting tool is in contact with the workpiece for an integer number of vibration cycles. The machine tool stiffness and structural damping will affect the workpiece quality, but the most significant improvements are made through thoughtful selection of the flycutter spindle speed as it relates to the machine dynamics.
Originality/value
This paper presents a math model that accurately matches results obtained by experimental verification and extensive testing. Interferometry is shown to be an extremely useful tool in optimizing the process conditions in a flycutting manufacturing operation. Furthermore, the results are of general use to practitioners using flycutting in a variety of industrial applications.
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Application of the numerical method to the art of Medicine was regarded not as a “trivial ingenuity” but “an important stage in its development”; thus proclaimed Professor…
Abstract
Application of the numerical method to the art of Medicine was regarded not as a “trivial ingenuity” but “an important stage in its development”; thus proclaimed Professor Bradford Hill, accepted as the father of medical statistics, a study still largely unintelligible to the mass of medical practitioners. The need for Statistics is the elucidation of the effects of multiple causes; this represents the essence of the statistical method and is most commendable. Conclusions reached empirically under statistical scrutiny have mistakes and fallacies exposed. Numerical methods of analysis, the mathematical approach, reveals data relating to factors in an investigation, which might be missed in empirical observation, and by means of a figure states their significance in the whole. A simplified example is the numerical analysis of food poisoning, which alone determines the commonest causative organisms, the commonest food vehicles and the organisms which affect different foods, as well as changes in the pattern, e.g., the rising incidence of S. agona and the increase of turkey (and the occasions on which it is served, such as Christmas parties), as a food poisoning vehicle. The information data enables preventive measures to be taken. The ever‐widening fields of Medicine literally teem with such situations, where complexities are unravelled and the true significance of the many factors are established. Almost every sphere of human activity can be similarly measured. Apart from errors of sampling, problems seem fewer and controversy less with technical methods of analysis then on the presentation and interpretation of figures, or as Bradford Hill states “on the application of common sense and on elementary rules of logic”.
Dana L. Platt and Mark J. McKeefry
The United States Securities and Exchange Commission adopted Regulation S in 1990 to clarify that offshore offers and sales of securities need not comply with the onerous…
Abstract
The United States Securities and Exchange Commission adopted Regulation S in 1990 to clarify that offshore offers and sales of securities need not comply with the onerous registration requirements of US securities laws. In the short time since Regulation S was adopted, a number of issuers have abused the regulation. Amendments designed to curb these abuses have been recently proposed. This paper addresses the impact of the amendments and identifies significant issues to consider when undertaking a Regulation S transaction.
Lauren C. Mims, Cierra Kaler-Jones, Abigail A. Amoako Kayser and David J. Johns
Recent scholarship has focused on the schooling experiences of Black boys in early childhood; however research on the experiences and outcomes of Black girls in early childhood…
Abstract
Recent scholarship has focused on the schooling experiences of Black boys in early childhood; however research on the experiences and outcomes of Black girls in early childhood remains virtually nonexistent. More research is needed to ensure that every Black girl excels in early childhood education. Through three reflections from Black early educators, written iteratively through a process of reflection, discussion, writing, and revision, this chapter highlights aspects of Black girls' schooling that can promote Black girls' rapidly developing social, emotional, regulatory, and moral capacities. Within each reflection, the educator's advance our understanding of culturally relevant pedagogy by showing how educators can “teach to and through” Black girls’ funds of knowledge. Additionally, the reflections highlight the powerful role schools play in the lives of Black girls, underscoring the need to more deeply investigate teacher's perceptions of Black girls in addition to the positive and the negative policies and practices enacted in classrooms. The chapter concludes with critical and timely recommendations for research, practice, and policy.
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In the last four years, since Volume I of this Bibliography first appeared, there has been an explosion of literature in all the main functional areas of business. This wealth of…
Abstract
In the last four years, since Volume I of this Bibliography first appeared, there has been an explosion of literature in all the main functional areas of business. This wealth of material poses problems for the researcher in management studies — and, of course, for the librarian: uncovering what has been written in any one area is not an easy task. This volume aims to help the librarian and the researcher overcome some of the immediate problems of identification of material. It is an annotated bibliography of management, drawing on the wide variety of literature produced by MCB University Press. Over the last four years, MCB University Press has produced an extensive range of books and serial publications covering most of the established and many of the developing areas of management. This volume, in conjunction with Volume I, provides a guide to all the material published so far.
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Rafael Borim-de-Souza, Zandra Balbinot, Eric Ford Travis, Luciano Munck and Adriana Roseli Wünsch Takahashi
– The purpose of this paper is to characterize sustainable development and sustainability as study objects for comparative management theory.
Abstract
Purpose
The purpose of this paper is to characterize sustainable development and sustainability as study objects for comparative management theory.
Design/methodology/approach
The primary objective of this paper is to characterize sustainable development and sustainability as study objects for comparative management theory.
Findings
Analytical dimensions were related to establishing three proposals, which represent possible theoretical routes for characterizing sustainable development and sustainability as study objects for comparative management theory. A framework which illustrates the theoretical route taken to develop these proposals is presented at the end of the theoretical-analytical discussions.
Research limitations/implications
This paper considers that discussion about sustainable development, sustainability and comparative management theory, as interesting themes for organizational studies, lack epistemological clarity and theoretical depth. Such shortcomings are identified based upon the difficulty in identifying ontological postures, epistemological perspectives, dominant paradigms and conceptual approaches that enable greater coherence to analysis of these themes, and also support the undertaking of research that can contribute to enriching proposals related to comparative management theory.
Originality/value
This is an innovative paper as it relates comparative management theory approaches with structural concepts from sustainable development and sustainability developed using contributions from organizational theories, sociological reflections, and political science. The proposed characterization is intended to blaze new and alternative epistemological paths for adding greater rigor to empirical research focussed on the relationship investigated here in a theoretical context.
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Amanda Datnow, Hayley Weddle and Marie Lockton
Teachers across the globe have been called upon to employ evidence-informed practices to guide instructional decision-making. Using a social regulation/cohesion matrix and…
Abstract
Teachers across the globe have been called upon to employ evidence-informed practices to guide instructional decision-making. Using a social regulation/cohesion matrix and institutional theory analytic lens can help illuminate the barriers and enablers shaping teachers' efforts to use evidence in different policy contexts. In the US, there is social cohesion with respect to public schooling as well as a high degree of regulation with respect to accountability. In this chapter, we closely examine the work of a teacher team in a California middle school that we studied for four years using case study methods. While teachers on this team shared an interest in evidence use and were open to trying research-based practices in their own classrooms, doing so consistently was challenging. The teacher team's use of evidence to inform practice was shaped by three themes. First, several capacity-building opportunities provided teachers with support for drawing on research-based practices as well as eliciting student thinking as a form of evidence on student learning. However, lack of cohesion across these opportunities functioned as a barrier to effective implementation of strategies. Finally, a strong focus on accountability ultimately constrained the team's ability to consistently use evidence to inform daily practice. Lessons for policy and practice are discussed.