Experiments on Pulse Propagation in an Obliquely Laminated Composite

1974 ◽  
Vol 41 (4) ◽  
pp. 1052-1056 ◽  
Author(s):  
C. Sve ◽  
S. Okubo
Keyword(s):  
Pulse Propagation ◽  
Rear Surface ◽  
Laminated Composite ◽  
Theoretical Work ◽  
Surface Velocity ◽  
Capacitive Transducer ◽  
Linear Elastic ◽  
Viscosity Effects ◽  
History Of ◽  
Velocity History

Experimental results are presented for the linear elastic dynamic response of periodically laminated composites. A shock tube-capacitive transducer technique is used to determine the rear surface velocity history of three laminated samples that have different lamination angles and are subjected to a step pressure loading. Viscosity effects are discussed, and comparisons are made with predictions based on previous theoretical work.

Experiments on Dispersive Pulse Propagation in Laminated Composites and Comparison With Theory

1969 ◽  
Vol 36 (3) ◽  
pp. 485-490 ◽  
Author(s):  
J. S. Whittier ◽  
J. C. Peck
Keyword(s):  
Pulse Propagation ◽  
Laminated Composites ◽  
Rear Surface ◽  
Step Function ◽  
Surface Velocity ◽  
Flat Plates ◽  
Theoretical Predictions ◽  
Long Time ◽  
Capacitance Gauge ◽  
High Degree

Transient stress-wave experiments on laminated composites are described, and the results are compared with theoretical predictions. The composites are laminated from alternating layers of high and low-modulus material, which cause a high degree of geometric dispersion of waves propagating in the composite. Experiments were conducted in which waves propagated parallel to the laminations. Flat plates were subjected on one face to a uniform pressure with step-function time dependence induced by a gas-dynamic shock wave. Under this loading, the central portion of the specimen initially responds as if it were laterally unbounded. The average velocity over a 3/8-in-dia area of the backface of the plate was measured with a capacitance gauge. The results are in good agreement with theoretical predictions made with a long-time asymptotic approximation called the head-of-the-pulse approximation. The theory isolates the dominant character of the response and predicts timing and amplitude of oscillations in normalized rear surface velocity within a few percent.

scholarly journals Matrices of ‘Love and Theft’: Joan Baez Imitates Bob Dylan

2021 ◽  
pp. 1-31
Author(s):  
MIMI HADDON
Keyword(s):  
Final Section ◽  
Theoretical Work ◽  
First Century ◽  
Post Colonial ◽  
The Third ◽  
Bob Dylan ◽  
Colonial Theory ◽  
History Of ◽  
Asymmetrical Power ◽  
American Popular Music

Abstract This article uses Joan Baez's impersonations of Bob Dylan from the mid-1960s to the beginning of the twenty-first century as performances where multiple fields of complementary discourse converge. The article is organized in three parts. The first part addresses the musical details of Baez's acts of mimicry and their uncanny ability to summon Dylan's predecessors. The second considers mimicry in the context of identity, specifically race and asymmetrical power relations in the history of American popular music. The third and final section analyses her imitations in the context of gender and reproductive labour, focusing on the way various media have shaped her persona and her relationship to Dylan. The article engages critical theoretical work informed by psychoanalysis, post-colonial theory, and Marxist feminism.

Workhorse Models

2015 ◽  
Author(s):  
Pol Antràs
Keyword(s):  
International Trade ◽  
Intellectual History ◽  
Empirical Studies ◽  
Theoretical Work ◽  
Central Unit ◽  
Unit Of Analysis ◽  
Basic Understanding ◽  
History Of ◽  
Key Features ◽  
The Rich

This chapter provides a succinct account of the rich intellectual history of the field of international trade and offers an overview of its modern workhorse models. This field has experienced a true revolution in recent years. Firms rather than countries or industries are now the central unit of analysis. The workhorse trade models used by most researchers both in theoretical work as well as in guiding empirical studies were published in the 2000s. While these benchmark frameworks ignore contractual aspects, they constitute the backbone of the models developed later in this volume, so the chapter provides a basic understanding of their key features.

Life

2020 ◽  
pp. 8-32
Author(s):  
Benjamin Wiggins
Keyword(s):  
Public Relations ◽  
Insurance Industry ◽  
Theoretical Work ◽  
Business Practices ◽  
Insurance Company ◽  
Company Policy ◽  
History Of ◽  
A Company ◽  
History Of Race

Chapter 1 focuses on the early history of race-based insurance. When the Newark-based Prudential Insurance Company of America incorporated in 1875, it revolutionized the American insurance industry by offering policies to the working class for an affordable three cents per week. What made the Prudential doubly unique was that the company insured not simply industrial laborers, but also African American laborers. The company was not in the progressive vanguard, though. Rather, the Northern upstart, in contrast to its Southern competitors, simply had not thought to craft a company policy to explicitly ban African Americans from purchasing life insurance. Just five years after becoming the first insurer to cover black lives, the Prudential began to charge differential, race-based premiums and commenced a public relations effort to defend its discriminatory practices. This foundational chapter traces how the theoretical work of scientific racism became embedded in the business practices of American insurers.

scholarly journals A different kind of story: Pedagogy of hope at The Ration Shed Museum, Cherbourg

2018 ◽  
Vol 25 (2) ◽  
pp. 191-207
Author(s):  
Carly Smith
Keyword(s):  
Observational Data ◽  
Social Issues ◽  
Theoretical Work ◽  
Living Conditions ◽  
Dual Process ◽  
The Past ◽  
Ethnographic Interviews ◽  
History Of ◽  
Forced Labour ◽  
Pedagogy Of Hope

AbstractIn recounting the history of Cherbourg as an Aboriginal settlement, the Ration Shed Museum presents some traumatic narratives. It paints a picture of violent geographic and cultural dislocation, crude living conditions, forced labour and administrative oppression by infusing historical artefacts with the personal recollections of Cherbourg residents. The intent behind the Ration Shed Museum itself, however, is something quite different: its curators want to tell a story that speaks of hope for this community’s future, and to work towards some form of reconciliation. They do this by actively engaging with the ‘terrible gift’ of the past in the present, and by providing spaces for encounters that can lead to open discussions of difficult social issues and celebrations of contemporary Cherbourg life. This article draws on ethnographic interviews and observational data alongside the theoretical work of Roger I. Simon and Andrea Witcomb to describe how the Ration Shed Museum engages its community and visitors in a dual process of both understanding Cherbourg’s history and reframing traumatic narratives to enact a pedagogy of hope.

The Problem of the Attractor

2005 ◽  
Vol 22 (5) ◽  
pp. 45-65 ◽  
Author(s):  
Adrian Mackenzie
Keyword(s):  
World View ◽  
Deterministic Chaos ◽  
Theoretical Work ◽  
Complexity Science ◽  
Theory Building ◽  
Lorenz Attractor ◽  
Complexity Sciences ◽  
Social Sciences And Humanities ◽  
Recent Theoretical Work ◽  
History Of

Contemporary complexity sciences claim a literal, non-metaphorical applicability to physical, economic, social and cultural events. They envision the development of a general social or historical physics. Conversely, in the social sciences and humanities, complexity sciences have been typically treated as a source of new metaphors or tropes to be used in theory-building. Can there be a critical social or historical physics that is not a world-view and that does not treat science as a source of metaphors? The Lorenz attractor figures centrally in the history of complexity science as a popular image of ‘deterministic chaos’ and the ‘butterfly effect’, as an indication of how far complexity science has progressed in the last two decades, and, as this article argues, as an event whose multiplicity of interpretations attests to the problem it raises, the problem of generality associated with complexity. Via the Lorenz attractor, the article examines three attempts to treat complexity non-metaphorically in recent theoretical work (Delanda; Massumi; Stengers). In these accounts, the attractor performs several different functions. It forms part of a re-engineered concept of multiplicity, it helps conceptualize feeling or sensitivity, and it raises the general problem of practice in theory-building.

The Mind's Eye: George G. Simpson's Use of Visual Language

1995 ◽  
Vol 14 (1) ◽  
pp. 37-46 ◽  
Author(s):  
Léo Laporte
Keyword(s):  
Theoretical Work ◽  
Visual Language ◽  
Fundamental Change ◽  
Abstract Theory ◽  
Adaptive Landscapes ◽  
Statistical Inferences ◽  
History Of ◽  
Productive Thinking ◽  
Mind's Eye ◽  
Taxonomic Categories

Late in life, the American paleontologist George G. Simpson (1902-1984) remarked that "I compose my writing visually —I think visually, then translate that into words … I visualize at least as much as I verbalize, perhaps more. Even in abstract theory I often visualize first & then describe in words what I saw mentally." In much of his most significant theoretical work, Simpson did indeed use just such visual language to translate his more original concepts and interpretations regarding, for example, statistical inferences about evolving lineages, relationships of spedation to higher taxonomic categories, ratio diagrams of morphological dimensions, and species-density contouring. Simpson's most interesting and innovative visualizations had to do with organism-environment relationships, including adaptive landscapes, prospective and realized functions of organisms and environments, and especially the adaptive grid upon which he summarized his argument for variable rates and patterns of evolution —"tempo and mode" —in response to differing ecological opportunities available to animal and plant species. "There [is] much evidence that truly productive thinking in whatever area of cognition takes place in the realm of imagery." — Rudolf Arnheim "Acceptance of the conceptual importance of visual modes of discourse will require a rather fundamental change of intellectual values within the history of science" — Martin Rudwick "A diagram is no proof! A diagram is no proof!"—Francis Toner

Sign in / Sign up

Export Citation Format

Share Document