Results 261 to 270 of about 589,125 (300)

Long-distance pollinator flights and pollen dispersal between populations of Delphinium nuttallianum

Oecologia, 2001
Spatial processes in pollination biology are poorly understood, especially at levels above that of the local population. For example, little is known about how pollinators and pollen move among populations, although there is evidence that such movement can exceed what is predicted from intrapopulational movement.
Bradd, Schulke, Nickolas M, Waser
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A novel population initialization strategy for accelerating Levy flights based multi-verse optimizer

Journal of Intelligent & Fuzzy Systems, 2020
In this paper, we have designed a new optimization technique, which is named as the Improved Multi-verse Algorithm with Levy Flights (ILFMVO) algorithm. The quality of the population is an important factor that can directly or indirectly affect the strength of an algorithm in searching for the given search space for an optimal solution. Also, having an
Sohail Ahmad, Muhammad Sulaiman 0001, Poom Kumam, Zubair Hussain, Muhammad Asif Jan, Wali Khan Mashwani, Masih Ullah   +6 more
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Assessment of the Risk to Ground Population Due to an Unmanned Aircraft In-Flight Failure

10th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference, 2010
Unmanned aircraft systems (UAS) are expected to have an increased presence in the national airspace in the coming years. There have been concerns about the airworthiness of these vehicles versus traditional manned aircraft and the implications for risk to the ground population due to an in-flight system failure.
Andrew Ford, Kevin McEntee
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Flight morphology in fragmented populations of a rare British butterfly, Hesperia comma

Biological Conservation, 1999
Abstract In modern landscapes, many populations of rare species are restricted to fragments of formerly extensive habitat. However, the potential for evolutionary changes in dispersal ability to occur within these fragmented populations has received little attention.
J.K Hill, C.D Thomas, O.T Lewis
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Comparison of anthropometry of Brazilian and US Military population for flight deck design

International Journal of Industrial Ergonomics, 2018
Abstract A valid anthropometric dataset is essential to optimize the design of personal equipment and aircrafts. Until recently there were no anthropometric data available for the Brazilian Air Force (FAB) pilot population, and hence international military data have often been used in Defense procurement specifications.
Gilvan V. da Silva, Claire C. Gordon, Manny Halpern   +2 more
openaire   +1 more source

[Burnout and psychosocial risk factors in the career of flight attendants: Descriptive study of a population of Lebanese flight attendants].

L'Encephale, 2017
The aim of our study was to investigate the influence of demographic factors (gender and age), work related factors (the position and years of practice) and psychosocial risk factors (cognitive demands, demands to hide emotions, work-family conflict, offensive behaviors…) on the development of burnout among flight attendants, and the nature of ...
N, Richa, H, Zreik, S, Richa
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Cardiovascular Risk Factors in Commercial Flight Aircrew Officers Compared with Those in the General Population

Angiology, 1996
Cardiovascular disease is the most common reason for loss of license among commercial flight pilots. This study was done to explore cardiovascular risk factors among aircrew officers. The study group consisted of 113 male commercial flight aircrew officers (aviators), aged thirty-five to forty-four years (mean: 38.8 years) who participated in the ...
K, Ekstrand, P A, Boström, M, Arborelius, J A, Nilsson, S E, Lindell   +4 more
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STATUS SELECTIVE WHITE FLIGHT AND CENTRAL CITY POPULATION CHANGE: A COMPARATIVE ANALYSIS*

Journal of Regional Science, 1980
The present study is concerned with evaluating the roles of previously suggested policy-alterable factors and more fundamental demographic structural features of the metropolitan area as determinants of status-specific white city- to-suburb movement. The multivariate analysis employs census migration data pertaining to the 1965-1970 period for 39 large
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Effects of body-size variation on flight-related traits in latitudinal populations of Drosophila melanogaster

Journal of Genetics, 2014
In the present study, we tested the hypothesis whether flight-related traits such as wing area, flight-muscle ratio, wing loading and dispersal yield evidence of geographical variation in nine wild-collected as well as laboratory-reared (at 21°C) latitudinal populations of Drosophila melanogaster from the Indian subcontinent.
Veer, Bhan, Ravi, Parkash, Dau Dayal, Aggarwal   +2 more
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Effects of ozone on symptoms and cardiopulmonary function in a flight attendant surrogate population.

Aviation, space, and environmental medicine, 1980
Two studies were conducted to ascertain the lowest ozone concentration threshold for statistically significant adverse effects on cardiopulmonary function and symptoms in male and female surrogates of the flight attendant population. Both studies simulated in-flight environmental conditions at 1,829 m mean sea level (MSL) chamber altitude.
M T, Lategola, C E, Melton, E A, Higgins
openaire   +1 more source