Estimating Proportion of Large Salmon on Harry's River, Newfoundland Using a DIDSON Acoustic Camera
Estimating Proportion of Large Salmon on Harry's River, Newfoundland Using a DIDSON Acoustic Camera

Author:

Publisher:

Published: 2016

Total Pages: 0

ISBN-13:

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To assess the status of the salmon stocks in NL, the Department of Fisheries and Oceans (DFO) count the number of salmon returning to a selection of rivers each year (Fig. [...] At most salmon enumeration facilities in NL, the proportion of large salmon in the annual run is determined by either trapping and measuring a sub-sample of the run or by capturing video images of the migrating fish and converting video lengths to actual lengths. [...] In 2012, the opening in the partial counting fence was narrowed to approximately 10 m and the long-range DIDSON (low-frequency) was used as an auxiliary counter in the event of a failure of the short-range unit or a fence washout. [...] LENGTH MEASUREMENTS During the years when traps operated, salmon were measured from the tip of the nose to the fork of the tail using a measuring board (Fig. [...] The camera and monitor were calibrated by inserting a 63 cm board in the tunnel through which the fish swam, then transferring the length of the board to the monitor's screen.

A Mind Always in Motion: The Autobiography of Emilio Segrè
A Mind Always in Motion: The Autobiography of Emilio Segrè

Author: Emilio Segrè

Publisher: Plunkett Lake Press

Published: 2019-08-17

Total Pages: 252

ISBN-13:

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Born in Italy to a well-to-do Jewish family, Emilio Segrè (1905-1989) became Enrico Fermi’s first graduate student in 1928, contributed to the discovery of slow neutrons and was appointed director of the University of Palermo’s physics laboratory in 1936. While visiting the Radiation Laboratory in Berkeley, California in 1938, he learned that he had been dismissed from his Palermo post by Mussolini’s Fascist regime. Ernest O. Lawrence hired him to work on the cyclotron at Berkeley with Luis Alvarez, Edwin McMillan, and Glenn Seaborg. Segrè was one of the first to join Oppenheimer at Los Alamos, where he became a group leader on the Manhattan Project. In 1959, he won the Nobel Prize in physics for the discovery of the antiproton. He was a professor of physics at UC Berkeley from 1946 until 1972. “[A] readable, absorbing, interesting autobiography... A valuable contribution by a person who witnessed the development of much of modern nuclear physics. Segrè’s description of the historic neutron experiments performed in Rome during the mid-1930s by Enrico Fermi’s group, of which Segrè was a member, is of inestimable worth.” — Glenn T. Seaborg, Physics Today “A Mind Always in Motion is Emilio Segrè’s account — published four years after his death in 1989 — of his personal life and his life in physics... It is absorbing, moving in places and frequently revealing. Segrè noted in his preface, ‘I have not sought to display manners and tact I never had, and I have tried to treat myself no better than any one else.’ He ably succeeded in these purposes.” — Daniel J. Kevles, Nature “For general readers with an interest in the history of nuclear physics, Segrè... is among the most personable witnesses.” — Publishers Weekly

Migrants and Migration in Modern North America
Migrants and Migration in Modern North America

Author: Dirk Hoerder

Publisher: Duke University Press Books

Published: 2011-09-26

Total Pages: 0

ISBN-13: 9780822350514

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Presenting an unprecedented, integrated view of migration in North America, this interdisciplinary collection of essays illuminates the movements of people within and between Canada, the Caribbean, Mexico, and the United States over the past two centuries. Several essays discuss recent migrations from Central America as well. In the introduction, Dirk Hoerder provides a sweeping historical overview of North American societies in the Atlantic world. He also develops and advocates what he and Nora Faires call “transcultural societal studies,” an interdisciplinary approach to migration studies that combines migration research across disciplines and at the local, regional, national, and transnational levels. The contributors examine the movements of diverse populations across North America in relation to changing cultural, political, and economic patterns. They describe the ways that people have fashioned cross-border lives, as well as the effects of shifting labor markets in facilitating or hindering cross-border movement, the place of formal and informal politics in migration processes and migrants’ lives, and the creation and transformation of borderlands economies, societies, and cultures. This collection offers rich new perspectives on migration in North America and on the broader study of migration history. Contributors. Jaime R. Aguila. Rodolfo Casillas-R., Nora Faires, Maria Cristina Garcia, Delia Gonzáles de Reufels, Brian Gratton, Susan E. Gray, James N. Gregory, John Mason Hart, Dirk Hoerder, Dan Killoren, Sarah-Jane (Saje) Mathieu, Catherine O’Donnell, Kerry Preibisch, Lara Putnam, Bruno Ramirez, Angelika Sauer, Melanie Shell-Weiss, Yukari Takai, Omar S. Valerio-Jiménez, Carlos G. Vélez-Ibáñez

Lakes of New York State
Lakes of New York State

Author: Jay A. Bloomfield

Publisher: Elsevier

Published: 2013-10-22

Total Pages: 516

ISBN-13: 148327750X

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Lakes of New York State, Volume I: Ecology of the Finger Lakes describes the state of Finger Lakes, which is a group of eleven elongated bodies of water of glacial origin in the west-central portion of New York, and its respective watershed. This book assesses the structure of the Finger Lakes' plant and animal communities and how these communities interact with the abiotic components of the environment. The condition of the lakes from the standpoint of fish population dynamics are also analyzed, including an examination of the various physical, chemical, and biological aspects of the lakes' ecosystem. This text ranks the Finger Lakes into a unilateral trophic list by tabulating their trophic information according to three commonly used indicator measurements— average summer Secchi disc depth, average summer chlorophyll a concentration, and average winter total phosphorus level. This publication is valuable to limnologists and ecologists working on temperate zone freshwater lakes.