scholarly journals Paradigm shifts in surface metrology. Part II. The current shift

2007 ◽  
Vol 463 (2085) ◽  
pp. 2071-2099 ◽  
Author(s):  
X Jiang ◽  
P.J Scott ◽  
D.J Whitehouse ◽  
L Blunt
Keyword(s):  
Paradigm Shift ◽  
Functional Performance ◽  
Historical Context ◽  
Surface Metrology ◽  
Paradigm Shifts ◽  
Surface Geometry ◽  
Structured Surfaces ◽  
Geometrical Features ◽  
Ultra Precision ◽  
Current Shift

This is the second part of the paper ‘Paradigm shifts in surface metrology’. In part I, the three historical paradigm shifts in surface metrology were brought together, and the subsequent evolution resulting from the shifts discussed. The historical philosophy highlighted the fact that the paradigm shifts must be robust and flexible, meaning that surface metrology must allow for full control of surface manufacture and provide an understanding of the surface functional performance. Part II presents the current paradigm shift as a ‘stepping stone’, building on the above historical context. Aspects of surface geometry will also have to cater for surfaces derived from disruptive application, i.e. structured and freeform surfaces are identified candidates. The current shift is presented in three aspects: from profile to areal characterization; from stochastic to structured surfaces; and from simple geometries to complex freeform geometries, all spanning the millimetre to sub-nanometre scales. In this paradigm shift, the scale of surface texture is beginning to approach some of the geometrical features in micro/nano electro-mechanical systems devices and is becoming one of the most important functionality indicators. Part II will contextualize the current shifts in the discipline of surface metrology, and cement surface metrology in place in the ultra precision and nanotechnology age.

scholarly journals Paradigm shifts in surface metrology. Part I. Historical philosophy

2007 ◽  
Vol 463 (2085) ◽  
pp. 2049-2070 ◽  
Author(s):  
X Jiang ◽  
P.J Scott ◽  
D.J Whitehouse ◽  
L Blunt
Keyword(s):  
Paradigm Shift ◽  
Free Form ◽  
Surface Metrology ◽  
Paradigm Shifts ◽  
Surface Geometry ◽  
Structured Surfaces ◽  
Manufactured Products ◽  
Philosophical Framework ◽  
Effective Development ◽  
Second World

Surface texture and its measurement are becoming the most critical factors and important functionality indicators in the performance of high precision and nanoscale devices and components. Surface metrology as a discipline is currently undergoing a huge paradigm shift: from profile to areal characterization, from stochastic to structured surfaces, and from simple geometries to complex free-form geometries, all spanning the millimetre to sub-nanometre scales. This paper builds a complete philosophical framework for surface metrology through a review of the paradigm shifts that have occurred in the discipline of surface metrology, tracing the development of fundamental philosophies and techniques. The paper starts with a brief overview of the historical paradigm shifts and builds an up-to-date foundational philosophy, capable of rapid and effective development. The growth in interest in surface metrology stems mainly from the need to control the manufacture of armaments during the Second World War and the production of domestic goods and appliances since that time. The surfaces produced by manufacture seemed to offer the possibility of being useful for process control. Unfortunately, only a few tentative investigations had been carried out to establish usable relationships between the processes, the machine tools and the available surface parameters (with their limitations). Even fewer investigations had been carried out to relate surface geometry to the performance of manufactured products. The result was that the metrology was unprepared and, consequently, the progress was sporadic. This overall review is given in two parts. Part I focuses on the historical philosophy of surface metrology and Part II discusses the progress within the current paradigm shift.

Micro- and Nano-instrument Power

2006 ◽  
Vol 973 ◽  
Author(s):  
Vassili Karanassios
Keyword(s):  
Signal Processing ◽  
Chemical Analysis ◽  
Data Acquisition ◽  
Cancer Diagnosis ◽  
Paradigm Shift ◽  
The Other ◽  
Paradigm Shifts ◽  
Comparable Performance ◽  
Wireless Interface ◽  
Capsule Size

ABSTRACTFor the last several years, we have been developing and characterizing “mobile” micro- and nano-instruments for use on-site (e.g., in the field). Although such portable, battery-operated instruments are much smaller that their laboratory-scale counterparts, sometimes they provide comparable performance and they often offer improved capabilities. As such, they are expected to cause a paradigm shift in classical chemical analysis by allowing practioners to “bring the lab (or part of it) to the sample”. Two classes of examples will be used as the means with which to illustrate the power of micro- and nano-instruments. One class involves a “patient” as the sample and an ingestible capsule-size spectrometer used for cancer diagnosis of the gastro intestinal tack as (part of) “the lab”. The other involves the “environment” as the sample and a portable, battery-operated, miniaturized instrument that utilizes a PalmPilot™ with a wireless interface for data acquisition and signal processing as (part of) “the lab”. To discuss how to electrically power such miniaturized instruments, mobile energy issues will be addressed. Particular emphasis will be paid to current or anticipated future applications and to the paradigm shifts that may prove essential in powering the next generation of miniaturized instruments.

scholarly journals Herring and ICES: a historical sketch of a few ideas and their linkages

2009 ◽  
Vol 66 (8) ◽  
pp. 1652-1661 ◽  
Author(s):  
Mike Sinclair
Keyword(s):  
Paradigm Shift ◽  
Pelagic Fish ◽  
Marine Ecology ◽  
Effective Management ◽  
Paradigm Shifts ◽  
Population Thinking ◽  
Fish Stocks ◽  
Considerable Debate ◽  
Historical Sketch

Abstract Sinclair, M. 2009. Herring and ICES: a historical sketch of a few ideas and their linkages. – ICES Journal of Marine Science, 66: 1652–1661. This introduction to the Symposium on “Linking Herring” sketches the development of some ideas generated from herring research within an ICES context. The work of Committee A (1902–1908), under the leadership of Johan Hjort, led to a paradigm shift from “migration thinking” to “population thinking” as the interpretation of fluctuations in herring landings. From the 1920s to the 1950s, the focus on forecasting services for the herring fisheries, although ultimately unsuccessful, had the unintended consequence of generating ideas on recruitment overfishing and the match–mismatch hypothesis. The collapse of the East Anglian fishery led, in 1956, to considerable debate on its causes, but no consensus was reached. Three consecutive symposia dealing with herring (1961, 1968, and 1970) reveal a changing perspective on the role of fishing on recruitment dynamics, culminating in Cushing’s 1975 book (“Marine Ecology and Fisheries”, referred to here as the “Grand Synthesis”), which defined the concept of recruitment overfishing and established the future agenda for fisheries oceanography. The 1978 ICES “Symposium on the Assessment and Management of Pelagic Fish Stocks” is interpreted as the “Aberdeen Consensus” (i.e. without effective management, recruitment overfishing is to be expected). In conclusion, herring research within ICES has led to many ideas and two major paradigm shifts.

scholarly journals Social Representations of the Environment in Press Media

2015 ◽  
Vol 25 (61) ◽  
pp. 261-269 ◽  
Author(s):  
Gislei Mocelin Polli ◽  
Brigido Vizeu Camargo
Keyword(s):  
Paradigm Shift ◽  
Social Representations ◽  
Representational Content ◽  
Environmental Issues ◽  
Paradigm Shifts ◽  
Qualitative Survey ◽  
The Press ◽  
Global Impacts ◽  
The Media ◽  
Over Time

Environmental issues are given prominence in the media and scientific circles. From the 60’s until early 2010 there were changes in the way people related to the environment, with a paradigm shift occurring regarding the environment. This study sought to identify the representational content disseminated by the press media on the environment in different periods. A qualitative survey was therefore conducted of documents, and data were obtained through texts published in a magazine with national circulation. The data were analyzed using the ALCESTE program with a Lexicographic Analysis. It was identified that the press media reflects the paradigm shifts, and publications dating from the late 60’s are compatible with the old paradigm, evolving over time, and are now compatible with the new environmental paradigm. The results indicate that currently the environment needs care in all its aspects and lack of care creates global impacts.

scholarly journals Can semiotics be used to drive paradigm changes in medical education?

2018 ◽  
Vol 46 (4) ◽  
pp. 491-516
Author(s):  
John Tredinnick-Rowe
Keyword(s):  
Medical Education ◽  
Paradigm Shift ◽  
Charles Sanders Peirce ◽  
Background Information ◽  
Paradigm Change ◽  
Threshold Concepts ◽  
Paradigm Shifts ◽  
Medical Educator ◽  
Situational Ethics ◽  
Scholastic Philosophy

This essay sets out to explain how educational semiotics as a discipline can be used to reform medical education and assessment. This is in response to an ongoing paradigm shift in medical education and assessment that seeks to integrate more qualitative, ethical and professional aspects of medicine into curricula, and develop ways to assess them. This paper suggests that a method to drive this paradigm change might be found in the Peircean idea of suprasubjectivity. This semiotic concept is rooted in the scholastic philosophy of John of St Thomas, but has been reintroduced to modern semiotics through the works of John Deely, Alin Olteanu and, most notably, Charles Sanders Peirce. I approach this task as both a medical educator and a semiotician. In this paper, I provide background information about medical education, paradigm shifts, and the concept of suprasubjectivity in relation to modern educational semiotic literature. I conclude by giving examples of what a suprasubjective approach to medical education and assessment might look like. I do this by drawing an equivalence between the notion of threshold concepts and suprasubjectivity, demonstrating the similarities between their positions. Fundamentally, medical education suffers from tensions of teaching trainee doctors the correct balance of biological science and situational ethics/ judgement. In the transcendence of mind-dependent and mind-independent being the scholastic philosophy of John of St Thomas may be exactly the solution medicine needs to overcome this dichotomy.

Fostering a Technology Cultural Change

2011 ◽  
pp. 240-246
Author(s):  
Dan Lim
Keyword(s):  
Higher Education ◽  
Information Technology ◽  
Cultural Change ◽  
Paradigm Shift ◽  
Education Institution ◽  
Paradigm Shifts ◽  
University Of Minnesota ◽  
Laptop Computing ◽  
Technology Commitment ◽  
The University

Many people in higher education wonder where the rapid changes in information technology are going to take them. Many more fear that the ongoing information technology explosion may eventually leave them behind. Due to entrenched mindsets and bureaucracy in higher education, fostering a technology cultural change requires paradigm shifts in all areas of administration, teaching, and research. A fundamental paradigm shift must happen in four areas before a technology cultural change can be set on a forward path. This chapter focuses on four essential components of a paradigm shift in technology and higher education at the University of Minnesota Crookston (UMC). This case describes how a paradigm shift model can help to promote a long-term technology cultural change in a higher education institution. The model consists of technology commitment, technology philosophy, investment priority, and development focus. It has been used at UMC to bring about a reengineering of the entire institution to support a ubiquitous laptop environment throughout the curriculum and campus. The model has helped UMC achieve an overwhelming success in utilizing laptop computing and other technology to enhance learning.

scholarly journals Successive Paradigm Shifts in the Bacterial Cell Cycle and Related Subjects

Life ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 27
Author(s):  
Vic Norris
Keyword(s):  
Cell Cycle ◽  
Steady State ◽  
Growth Rates ◽  
Bacterial Cell ◽  
Paradigm Shift ◽  
Eukaryotic Cell ◽  
Origins Of Life ◽  
Paradigm Shifts ◽  
Bacterial Physiology ◽  
Bacterial Cell Cycle

A paradigm shift in one field can trigger paradigm shifts in other fields. This is illustrated by the paradigm shifts that have occurred in bacterial physiology following the discoveries that bacteria are not unstructured, that the bacterial cell cycle is not controlled by the dynamics of peptidoglycan, and that the growth rates of bacteria in the same steady-state population are not at all the same. These paradigm shifts are having an effect on longstanding hypotheses about the regulation of the bacterial cell cycle, which appear increasingly to be inadequate. I argue that, just as one earthquake can trigger others, an imminent paradigm shift in the regulation of the bacterial cell cycle will have repercussions or “paradigm quakes” on hypotheses about the origins of life and about the regulation of the eukaryotic cell cycle.

Fast Generation of Planar Micro-Structured Surfaces by Elliptical Vibration Texturing

2016 ◽  
Author(s):  
Yang Yang ◽  
Ping Guo
Keyword(s):  
Simulation Model ◽  
Functional Performance ◽  
Ultrasonic Frequency ◽  
Specific Class ◽  
Structured Surfaces ◽  
High Productivity ◽  
Elliptical Vibration ◽  
Elliptical Vibration Texturing ◽  
Cutting Velocity ◽  
Micro Dimples

Micro-structured surfaces have extensive applications in a wide array of fields, due to their improved functional performance. Existing manufacturing methods for these surfaces fall short of efficiency for volume production or are only applicable to a specific class of materials. In this paper, an innovative and highly-efficient machining method, elliptical vibration texturing (EVT), is proposed for rapid generation of micro-dimples on planar engineered surfaces. The cutting tool of the EVT process vibrates along an elliptical trajectory. The elliptical vibrations, when coupled with a high cutting velocity, impose micro-dimples onto workpiece surfaces while machining. The high productivity is achieved by adopting a newly designed tertiary motion generator which is able to deliver required elliptical vibrations at an ultrasonic frequency. The shape and distribution of the generated dimple patterns have been theoretically analyzed and predicted by a proposed simulation model. Preliminary texturing results using aluminum and brass as workpieces are given to validate the process principle and simulation model.

scholarly journals Surface geometry, miniaturization and metrology

2012 ◽  
Vol 370 (1973) ◽  
pp. 4042-4065 ◽  
Author(s):  
David J. Whitehouse
Keyword(s):  
Surface Geometry ◽  
Precision Engineering ◽  
Performance Change ◽  
Surface System ◽  
Ultra Precision ◽  
The Relationship

Ultra-precision engineering has at its core the size, shape and texture of the components used. This study examines how the relationship between them and their role is changing with respect to manufacture, function and characterization, with particular emphasis on aspects of miniaturization and ultra-precision engineering. Surface geometry has traditionally been linked to the generation of part size. This is changing: the study shows that it is now possible to separate shape and texture from the size generation and to design them independently for function. In addition, with miniaturization, the roles and properties of shape and texture that affect performance change considerably, especially those tribological functions involving contact and flow. This study reveals these changes and shows how the characterization of the surfaces making up a surface system can take these into account.

scholarly journals Precision surface measurement

2012 ◽  
Vol 370 (1973) ◽  
pp. 4089-4114 ◽  
Author(s):  
X. Jiang
Keyword(s):  
High Speed ◽  
Functional Performance ◽  
Surface Characteristics ◽  
Subject Area ◽  
Ease Of Use ◽  
Surface Measurement ◽  
Measurement Technology ◽  
Manufacturing Environment ◽  
Wide Range ◽  
Ultra Precision

Surface size, geometry and texture are some of the most influential subjects in the fields of precision and ultra-precision engineering, defining the functional interface through which emerging products operate. Next-generation products demand super-smooth surfaces, freeform geometries or even deterministically introduced microstructures to provide functional performance. Technological progress using these surfaces types is possible only if the associated manufacturing processes are rigorously controlled and the surfaces are measurable. Metrology for advanced surfaces is not established. The current state of the art is challenged in respect to (i) surface characteristics, extremity of size, ultra precision, quality, geometric complexity, or combinations of these aspects, and (ii) measurement technology for the manufacturing environment, in particular, online, non-contact, high speed, ease of use, small footprint and robustness. This study addresses the challenges in this subject area and discusses some fundaments and principles derived from interdisciplinary research. The combination of these aspects is enabling the creation of manufacturing-environment-based measurement technology. This is expected to facilitate advanced surface manufacture over a wide range of sectors, including large science programmes and high-technology engineering.

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