scholarly journals Tuna aggregation dynamics at Drifting Fish Aggregating Devices: a view through the eyes of commercial echosounder buoys

Author(s):  
Yannick Baidai ◽  
Laurent Dagorn ◽  
Monin J Amandè ◽  
Daniel Gaertner ◽  
Manuela Capello

Abstract This study addresses novel questions on the dynamics of tuna aggregations around floating objects, using echosounder buoys data collected throughout the drifts of newly deployed Drifting Fish Aggregating Devices (DFADs) in the Atlantic Ocean (AO) and Indian Ocean (IO). Time series of presence/absence of tunas were obtained by supervised classification of acoustic data. To avoid biases related to the variability in individual DFAD soak times, a new approach was developed to estimate the average colonization time of new DFADs by tuna aggregations. We showed that tunas colonize DFADs after an average of 16 days in the AO, and 40 days in the IO. Moreover, the analysis indicated that the time span during which tuna aggregations occupy DFADs is driven by a time-independent process with short- and long-term residence modes. On average, DFADs were continuously occupied by tuna aggregations for 6 and 9 days in the IO and AO, respectively. The time between two consecutive aggregations at the same DFAD averaged 9 days in the IO and 5 days in the AO. Throughout their soak time after being colonized, DFADs remained occupied for a larger proportion of time in the AO (63%) than in the IO (45%).

2021 ◽  
pp. 107385842199668
Author(s):  
Simone G. Shamay-Tsoory

Social interactions are powerful determinants of learning. Yet the field of neuroplasticity is deeply rooted in probing changes occurring in synapses, brain structures, and networks within an individual brain. Here I synthesize disparate findings on network neuroplasticity and mechanisms of social interactions to propose a new approach for understanding interaction-based learning that focuses on the dynamics of interbrain coupling. I argue that the facilitation effect of social interactions on learning may be explained by interbrain plasticity, defined here as the short- and long-term experience-dependent changes in interbrain coupling. The interbrain plasticity approach may radically change our understanding of how we learn in social interactions.


1986 ◽  
Vol 94 (6) ◽  
pp. 611-616 ◽  
Author(s):  
John R. Emmett ◽  
John J. Shea ◽  
William H. Moretz

The senior author's 8-year personal experience with biocompatible ossicular implants is reviewed. Four hundred sixty-one consecutive operations, in which high-density polyethylene sponge ossicular replacement prostheses were used, are grouped according to the Bellucci classification of chronic otitis media. The prostheses used were the drum-to-footplate prosthesis (TORP, total) and the drum-to-stapes prosthesis (PORP, partial)*. Each group's short- and long-term hearing results are compared. Prosthesis extrusion and persistent or recurrent conductive hearing loss are the most common causes of operation failure. Failures within each group are analyzed, and techniques to prevent these complications are outlined.


10.12737/5011 ◽  
2014 ◽  
Vol 21 (2) ◽  
pp. 104-109 ◽  
Author(s):  
Кодяков ◽  
A. Kodyakov ◽  
Груздев ◽  
D. Gruzdev ◽  
Федоров ◽  
...  

This paper is devoted to the actual problem of cosmetology - the procedures of filament rejuvenation of face and neck, which become popular every year. Literature data on the efficacy of these methods are controversial. The authors of most works indicate the minimum number of complications in the practical absence of negative appraisal methodology. The issues of development of the indication for use of some types of filaments and optimal criteria of evaluation of the expected effect in clinical practice are relevant and are discussed in this paper. Taking into account the absence of objective information about long-term consequences, other practical aspects of filament rejuvenation, the authors on the basis of many years of research and experience has specified evaluation criteria and suggested own classification of cosmetic filaments used in the method of filament rejuvenation of face and neck. Installation of filaments with different cosmetic features allows to reaching three different anti-aging effects: lifting, reinforcing and bio-stimulation. The degree of manifestation of these effects depends on the installation method of the thread, but first of all - on the design of conductive filament and needle or cannula. Based on the above data, the authors propose to divide all known cosmetic filaments on the basis of their purpose, proceeding from the achieved effect for three species - lifting, reinforcing and bio-stimulating. The new classification can be used in practice to optimize the selection of filaments for rejuvenation of face and neck and to reduce unintended side effects. The proposed classification of filaments has the purpose of definition of a fundamental criterion for their beauty opportunities. The practical application of this classification contributes to ensure adequate choice of filaments to perform the procedure, reduce side effects and create realistic expectations of doctors and patients from the procedures of the rejuvenation of face and neck.


1974 ◽  
Vol 11 (1) ◽  
pp. 142-164 ◽  
Author(s):  
P. La Rochelle ◽  
B. Trak ◽  
F. Tavenas ◽  
M. Roy

The present paper reports on the failure of a test embankment built on a soft, sensitive, and cemented clay in Saint-Alban, Quebec. The embankment was built as a first stage of a research program aimed at studying the short and long term behavior of embankments on soft clay foundations.A complete description of the embankment, of the instrumentation, and of the failure is given, followed by the analysis of the failure performed on the basis of different assumptions of fill behavior and of vane strength values mobilized in the clay crust. The analyses show that the assumptions of full mobilization of friction in the fill seems to be the most representative of the fill behavior in the present case and that a suitable factor of safety is obtained only when a reduction of vane strength is assumed to act in the crust.A new approach based on the residual undrained strength is suggested and seems to offer some potential as a valuable means of analyzing the stability of embankments on clay foundations.


Author(s):  
Сергей Вартанов

Настоящая работа представляет собой вторую часть цикла из пяти статей, посвященных обзору существующих моделей, методов и взглядов на эффекты воздействия экономического института рекламы на рынок на всех возможных уровнях. В ней рассмотрен самый нижний уровень влияния рекламы, связанный с изменением под ее воздействием поведения конечных потребителей. Эффекты, оказываемые рекламой на них, являются первичными эффектами, так как именно с них «начинается» цепочка рекламного влияния на рынок. В работе рассмотрены убеждающая и информативная функции рекламы, сопоставлены визуальные и текстовые ее варианты, обсуждаются основные положения когнитивного и поведенческого подходов к анализу воздействия рекламы на формирование потребительского спроса. Кроме того, описаны кратко- и долгосрочные первичные эффекты и особенности их учета и моделирования с помощью функций спроса и основанная на этом методология перехода к анализу поведения фирм, стремящихся использовать рекламное воздействие для достижения своих стратегических целей. The present work continues a cycle of review articles dedicated to a comprehensive description and analysis of effects caused by advertising as an economic institution on the whole economy on different levels. Whereas the introductive part of the cycle gives a general classification of such effects, the current work considers the lowest level of advertising impact associated with changes in the end consumers behavior. This class of effects may be regarded as the primary since they start the chain of advertising impact on the whole market. The paper considers the persuasive and informative functions of advertising, compares its visual and textual variants, discusses the main provisions of the cognitive and behavioral approaches to the analysis of the impact of advertising on the consumer demand formation as well as main models of advertising communication. In addition, short and long-term primary effects and the specifics of their accounting and modeling using demand functions and the methodology based on this for the transition to the analysis of the behavior of firms seeking to use advertising influence to achieve their strategic goals are described.


Author(s):  
Irina de la Flor ◽  
Maria Sarabia ◽  
Fernando Crecente ◽  
Maria Teresa Del Val

This paper proposes an innovative theoretical model building upon traditional Knowledge Management (KM) that could help increase both job satisfaction and efficiency of workers. The model introduces two new dimensions to KM: the classification of knowledge according to its origin; and the degree of impact the knowledge has on an individual’s efficiency and long-term satisfaction. This allows us to categorize knowledge as inner or outer according to its objective/subjective nature and the nature of the object aimed to be known. This theoretical paper proposes an innovative model called the Inner KM Model introducing a new variable defined as Inner Knowledge.


Energy ◽  
2021 ◽  
pp. 122438
Author(s):  
Artur Wyrwa ◽  
Wojciech Suwała ◽  
Marcin Pluta ◽  
Maciej Raczyński ◽  
Janusz Zyśk ◽  
...  

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