From Biology to Physics and Back: The Problem of Brownian Movement

2019 ◽  
Vol 10 (1) ◽  
pp. 275-293 ◽  
Author(s):  
Albert Libchaber
Keyword(s):  
Fractal Theory ◽  
Optical Trap ◽  
Particle Dynamics ◽  
Brownian Movement ◽  
Avogadro’S Number ◽  
The Third ◽  
History Of ◽  
Modern Application ◽  
Continuous Curves ◽  
Very High

This article focuses on the history of theoretical ideas but also on the developments of experimental tools. The experiments in our laboratory are used to illustrate the various developments associated with Brownian movement. In the first part of this review, we give an overview of the theory. We insist on the pre-Einstein approach to the problem by Lord Rayleigh, Bachelier, and Smoluchowski. In the second part, we detail the achievements of Perrin, measuring Avogadro's number, quantifying the experimental observations of Brownian movement, and introducing the problem of continuous curves without tangent, a precursor to fractal theory. The third part deals with modern application of Brownian movement, escape from a fixed optical trap, particle dynamics on a moving trap, and finally development of Brownian thermal ratchets. Finally, we give a short overview of bacteria motion, presented like an active Brownian movement with very high effective temperature.

Phase Stability in Binary Ti-Al

1990 ◽  
Vol 186 ◽  
Author(s):  
C.D. Anderson ◽  
W.H. Hofmeister ◽  
R.J. Bayuzick
Keyword(s):  
Phase Diagram ◽  
Thermal History ◽  
Sampling Rate ◽  
Electromagnetic Levitation ◽  
Solidification Structure ◽  
High Undercooling ◽  
The Third ◽  
High Sampling Rate ◽  
History Of ◽  
Very High

AbstractBinary Ti-Al samples containing from 46 to 54 at.% Al were solidified while undercooled by various amounts using electromagnetic levitation techniques. A detailed thermal history of these samples was obtained with sampling rates as high as 500 KHz during recalescence. This very high sampling rate was essential to resolve the thermal events. Primary α solidification was observed in samples containing from 51 to 54 at.% Al that were undercooled less than about 100 K at solidification. Primary β solidification was found for all undercoolings tested in samples containing less than 51 at.% Al and for undercoolings greater than about 100 K in samples containing 51 to 54 at.% Al. These first two observations are in agreement with results from Valencia et al. for Ti-45 at.% Al and Ti-50 at.% Al, respectively [4]. However, the third observation of β as the primary solidification structure at high undercooling and 54 at.% Al differs from Valencia's interpretation for Ti-55 at.% Al. The results in this study are consistent with the proposed McCullough Ti-Al phase diagram.

scholarly journals O prvoj monografskoj obradi škrinje Svetog Šimuna u Zadru

Ars Adriatica ◽  
2011 ◽  
pp. 187
Author(s):  
Marijana Kovačević
Keyword(s):  
Twentieth Century ◽  
Seventeenth Century ◽  
The Body ◽  
Early Date ◽  
The Third ◽  
Monographic Study ◽  
History Of ◽  
Very High ◽  
Do So

This paper paraphrases the first monographic study of the silver casket which was commissioned in the last quarter of the fourteenth century as a reliquary for the body of St Simeon in Zadar. The author of the monograph ‘The Silberschrein des S. Simeone in Zara’ is Alfréd Gotthold Meyer, an art historian from Berlin. The manuscript was written in German, translated into Hungarian and published in Budapest in 1894. Both the manuscript and the book are available only in a few copies in Croatia and this was one of the incentives for writing this article, apart from the need to introduce and evaluate one of the key works ever written on this important subject, and to do so in a more detailed manner than it had been done before. Meyer divided the material in five chapters. In the first chapter he deals with the traditions about the relic. The second chapter is a summary of the documents concerning the history of the silver casket. In the third chapter Meyer describes the reliefs on the casket and discusses their iconography, while in the fourth chapter he analyses them stylistically and attempts to reconstruct the original arrangement of particular reliefs. The final, fifth chapter is the most important part of this work, because it emphasizes comparisons between the Zadar casket and similar works in Italy and Dalmatia. The book has all the qualities of a scholarly text which is rather surprising for such an early date. Meyer pointed out a number of key notions about the supposedly different authors of particular reliefs, for example several master pieces of Italian painting and sculpture which may have inspired these authors, and he also noted the important seventeenth-century restoration on the casket. A. G. Meyer set very high scholarly standards with his work, which were rarely achieved in many subsequent publications on the casket, especially during the first half of the twentieth century.

A Comparison of Jacob Egharevba's Ekhere Vb Itan Edo and the Four Editions of Its English Translation, A Short History Of Benin

1998 ◽  
Vol 25 ◽  
pp. 361-386
Author(s):  
Uyilawa Usuanlele ◽  
Toyin Falola
Keyword(s):  
English Language ◽  
Short History ◽  
High Demand ◽  
Benin City ◽  
The Third ◽  
Forest Region ◽  
The World ◽  
History Of ◽  
Doctoral Dissertations ◽  
Very High

One of the most popular and most widely cited books in the study of precolonial Africa, particularly of the forest region, is Jacob U. Egharevba's A Short History of Benin. It was first published in the Edo language as Ekhere vb Itan Edo in 1933, and due to its popularity and very high demand, it quickly sold out and was reprinted in 1934. It was then translated by the author and published in English as A Short History of Benin in 1936. This English-language edition has likewise been a bestseller with four editions—the first edition in 1936, the second in 1953, the third in 1960, and the fourth one in 1968, which in turn has had reprints in Ibadan (1991) and Benin City (1994).In 1959 Leoham Adam, Curator of the Ethnographical Collection of Melbourne University in Australia, who claimed to have first read the book in the 1930s, commended Short History for its useful contributions to the study and understanding of African societies. The late R.E. Bradbury, in writing the first foreword to the book's third edition in 1960, claimed that it”…has become something of a classic, known and relied upon not only in Nigeria, but by scholars all over the world, [as]… a valuable, indeed an indispensable, pioneering work.” In a more recent critique, Adiele Afigbo asserted that the book and its thesis has “much support from many respected historians and ethnographers… and figure prominently not only in undergraduate essays but also in Masters and Doctoral dissertations.”

Monte Carlo Algorithms for Moments of Transition Arrays

1988 ◽  
Vol 102 ◽  
pp. 79-81
Author(s):  
A. Goldberg ◽  
S.D. Bloom
Keyword(s):  
Monte Carlo ◽  
State Vector ◽  
Basis Vector ◽  
Collective State ◽  
Dispersion Characteristics ◽  
Dipole Strength ◽  
The Third ◽  
Monte Carlo Algorithms ◽  
Third Moment ◽  
Very High

AbstractClosed expressions for the first, second, and (in some cases) the third moment of atomic transition arrays now exist. Recently a method has been developed for getting to very high moments (up to the 12th and beyond) in cases where a “collective” state-vector (i.e. a state-vector containing the entire electric dipole strength) can be created from each eigenstate in the parent configuration. Both of these approaches give exact results. Herein we describe astatistical(or Monte Carlo) approach which requires onlyonerepresentative state-vector |RV> for the entire parent manifold to get estimates of transition moments of high order. The representation is achieved through the random amplitudes associated with each basis vector making up |RV>. This also gives rise to the dispersion characterizing the method, which has been applied to a system (in the M shell) with≈250,000 lines where we have calculated up to the 5th moment. It turns out that the dispersion in the moments decreases with the size of the manifold, making its application to very big systems statistically advantageous. A discussion of the method and these dispersion characteristics will be presented.

A Universe of Societies

2018 ◽  
Author(s):  
Didier Debaise
Keyword(s):  
Spatial Relations ◽  
The Third ◽  
The Status ◽  
History Of ◽  
Temporal And Spatial

Which kind of relation exists between a stone, a cloud, a dog, and a human? Is nature made of distinct domains and layers or does it form a vast unity from which all beings emerge? Refusing at once a reductionist, physicalist approach as well as a vitalistic one, Whitehead affirms that « everything is a society » This chapter consequently questions the status of different domains which together compose nature by employing the concept of society. The first part traces the history of this notion notably with reference to the two thinkers fundamental to Whitehead: Leibniz and Locke; the second part defines the temporal and spatial relations of societies; and the third explores the differences between physical, biological, and psychical forms of existence as well as their respective ways of relating to environments. The chapter thus tackles the status of nature and its domains.

The Origins of Gritty Realism on British Television: Euston Films and Special Branch

2014 ◽  
Vol 11 (1) ◽  
pp. 23-40 ◽  
Author(s):  
Max Sexton
Keyword(s):  
Cultural Discourse ◽  
Technological Changes ◽  
Television Drama ◽  
The Third ◽  
Fourth Series ◽  
History Of

Euston Films was the first film subsidiary of a British television company that sought to film entirely on location. To understand how the ‘televisual imagination’ changed and developed in relationship to the parent institution's (Thames Television) economic and strategic needs after the transatlantic success of its predecessor, ABC Television, it is necessary to consider how the use of film in television drama was regarded by those working at Euston Films. The sources of realism and development of generic verisimilitude found in the British adventure series of the early 1970s were not confined to television, and these very diverse sources both outside and inside television are well worth exploring. Thames Television, which was formed in 1968, did not adopt the slickly produced adventure series style of ABC's The Avengers, for example. Instead, Thames emphasised its other ABC inheritance – naturalistic drama in the form of the studio-based Armchair Theatre – and was to give the adventure series a strong London lowlife flavour. Its film subsidiary, Euston Films, would produce ‘gritty’ programmes such as the third and fourth series of Special Branch. Amid the continuities and tensions between ABC and Thames, it is possible to discern how economic and technological changes were used as a cultural discourse of value that marks the production of Special Branch as a key transformative moment in the history of British television.

Displace of Documentary Heritage from the Soviet Union to Poland during the Third Decade of the XXth Century

2014 ◽  
Vol 3 ◽  
pp. 127-137
Author(s):  
Tatsiana Hiarnovich
Keyword(s):  
Soviet Union ◽  
International Agreements ◽  
Peace Treaty ◽  
Actual Process ◽  
Xxth Century ◽  
The Third ◽  
The Soviet Union ◽  
History Of ◽  
Selection Of

The paper explores the displace of Polish archives from the Soviet Union that was performed in 1920s according to the Riga Peace Treaty of 1921 and other international agreements. The aim of the research is to reconstruct the process of displace, based on the archival sources and literature. The object of the research is those documents that were preserved in the archives of Belarus and together with archives from other republics were displaced to Poland. The exploration leads to clarification of the selection of document fonds to be displaced, the actual process of movement and the explanation of the role that the archivists of Belarus performed in the history of cultural relationships between Poland and the Soviet Union. The articles of the Treaty of Riga had been formulated without taking into account the indivisibility of archive fonds that is one of the most important principles of restitution, which caused the failure of the treaty by the Soviet part.

The Question of Authority: Deracinating Race, Repositioning Religion, and Regenerating Gender in the History of African American Islam

2010 ◽  
Vol 4 (1-2) ◽  
pp. 213-227
Author(s):  
Rosemary Hicks
Keyword(s):  
African American ◽  
Review Essay ◽  
Oxford University ◽  
The Third ◽  
History Of ◽  
American Islam ◽  
African American Islam ◽  
Oxford University Press

A review essay devoted to Islam and the Blackamerican: Looking Toward the Third Resurrection by Sherman A. Jackson. Oxford University Press, 2005. 256 pages. Hb. $29.95/£22.50, ISBN-13: 9780195180817.

A Short Modern History of Studying Sacrobosco’s De sphaera

2020 ◽  
Vol 65 (Special Issue) ◽  
pp. 23-33
Author(s):  
Alin Constantin Corfu
Keyword(s):  
20Th Century ◽  
Modern History ◽  
13Th Century ◽  
The Third ◽  
History Of ◽  
University Of Paris ◽  
The University

"A Short Modern History of Studying Sacrobosco’s De sphaera. The treatise generally known as De sphaera offered at the beginning of the 13th century a general image of the structure of the cosmos. In this paper I’m first trying to present a triple stake with which this treaty of Johannes de Sacrobosco (c. 1195 - c. 1256). This effort is intended to draw a context upon the treaty on which I will present in the second part of this paper namely, a short modern history of studying this treaty starting from the beginning of the 20th century up to this day. The first stake consists in the well-known episode of translation of the XI-XII centuries in the Latin milieu of the Greek and Arabic treaties. The treatise De sphaera taking over, assimilating and comparing some of the new translations of the texts dedicated to astronomy. The second Consists in the fact that Sacrobosco`s work can be considered a response to a need of renewal of the curriculum dedicated to astronomy at the University of Paris. And the third consists in the novelty and the need to use the De sphaera treatise in the Parisian University’s curriculum of the 13th century. Keywords: astronomy, translation, university, 13th Century, Sacrobosco, Paris, curriculum"

Sign in / Sign up

Export Citation Format

Share Document