scholarly journals Regiões Euler: um Estudo sobre Distância Tonal e Integração entre os Ciclos Octatônicos e Hexatônicos

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Paulo de Tarso Salles
Keyword(s):  
Leonhard Euler ◽  
David Lewin

Este trabalho apresenta um estudo sobre distância tonal a partir de certos pressupostos estabelecidos por David Lewin (1982), Richard Cohn (1996; 2012), Jack Douthett & Peter Steinbach (1998), Clifton Callender (1998), Steven Baker (2003) e Dmitri Tymoczko (2011), entre outros. Demonstra como os ciclos octatônicos (descritos por Douthett e Steinbach), formados por acordes de sétima, podem conectar-se com as tríades consonantes dos ciclos hexatônicos (descritos por Cohn). Tal conexão entre acordes de diferentes cardinalidades é possível por meio de uma região harmônica denominada “região Euler”, em referência a um trabalho publicado pelo matemático e teórico Leonhard Euler no século XVIII, no qual uma topologia de tríades aumentadas resulta em acordes maiores com sétima maior. Uma breve análise de um quarteto de Villa-Lobos ilustra a importância das regiões Euler entre as tétrades e tríades perfeitas.

On the Shoulders of Giants

2018 ◽  
Author(s):  
David D. Nolte
Keyword(s):  
Eighteenth Century ◽  
Robert Hooke ◽  
New Approach ◽  
Isaac Newton ◽  
Least Action ◽  
New Science ◽  
Principle Of Least Action ◽  
Parabolic Trajectory ◽  
Leonhard Euler ◽  
New Generation

Galileo’s parabolic trajectory launched a new approach to physics that was taken up by a new generation of scientists like Isaac Newton, Robert Hooke and Edmund Halley. The English Newtonian tradition was adopted by ambitious French iconoclasts who championed Newton over their own Descartes. Chief among these was Pierre Maupertuis, whose principle of least action was developed by Leonhard Euler and Joseph Lagrange into a rigorous new science of dynamics. Along the way, Maupertuis became embroiled in a famous dispute that entangled the King of Prussia as well as the volatile Voltaire who was mourning the death of his mistress Emilie du Chatelet, the lone female French physicist of the eighteenth century.

Euler's contribution to number theory

2007 ◽  
Vol 91 (522) ◽  
pp. 453-461 ◽  
Author(s):  
Peter Shiu
Keyword(s):  
Eighteenth Century ◽  
Number Theory ◽  
Scientific Output ◽  
Scholarly Work ◽  
Long Period ◽  
Peter The Great ◽  
Complete Work ◽  
Leonhard Euler ◽  
The Subject ◽  
Historic Background

Individuals who excel in mathematics have always enjoyed a well deserved high reputation. Nevertheless, a few hundred years back, as an honourable occupation with means to social advancement, such an individual would need a patron in order to sustain the creative activities over a long period. Leonhard Euler (1707-1783) had the fortune of being supported successively by Peter the Great (1672-1725), Frederich the Great (1712-1786) and the Great Empress Catherine (1729-1791), enabling him to become the leading mathematician who dominated much of the eighteenth century. In this note celebrating his tercentenary, I shall mention his work in number theory which extended over some fifty years. Although it makes up only a small part of his immense scientific output (it occupies only four volumes out of more than seventy of his complete work) it is mostly through his research in number theory that he will be remembered as a mathematician, and it is clear that arithmetic gave him the most satisfaction and also much frustration. Gazette readers will be familiar with many of his results which are very well explained in H. Davenport's famous text [1], and those who want to know more about the historic background, together with the rest of the subject matter itself, should consult A. Weil's definitive scholarly work [2], on which much of what I write is based. Some of the topics being mentioned here are also set out in Euler's own Introductio in analysin infinitorum (1748), which has now been translated into English [3].

ASME Centennial Historical Perspective Paper: Mechanics of Blood Flow

1981 ◽  
Vol 103 (2) ◽  
pp. 102-115 ◽  
Author(s):  
R. Skalak ◽  
S. R. Keller ◽  
T. W. Secomb
Keyword(s):  
Blood Flow ◽  
Wave Propagation ◽  
Viscoelastic Behavior ◽  
Leonardo Da Vinci ◽  
Arterial System ◽  
Elastic Membrane ◽  
Biological Knowledge ◽  
Collapsible Tubes ◽  
Precise Understanding ◽  
Leonhard Euler

The historical development of the mechanics of blood flow can be traced from ancient times, to Leonardo da Vinci and Leonhard Euler and up to the present times with increasing biological knowledge and mathematical analysis. In the last two decades, quantitative and numerical methods have steadily given more complete and precise understanding. In the arterial system wave propagation computations based on nonlinear one-dimensional modeling have given the best representation of pulse wave propagation. In the veins, the theory of unsteady flow in collapsible tubes has recently been extensively developed. In the last decade, progress has been made in describing the blood flow at junctions, through stenoses, in bends and in capillary blood vessels. The rheological behavior of individual red blood cells has been explored. A working model consists of an elastic membrane filled with viscous fluid. This model forms a basis for understanding the viscous and viscoelastic behavior of blood.

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