Results 251 to 260 of about 589,125 (300)

The Relation of Flights of Colias to Larval Population Density

Ecology, 1949
The alfalfa caterpillar (Colias philodice eurytheme Boisduval), a native insect, has moved over from native legumes to introduced alfalfa and has become very abundant in the hot interior valleys of California. The largest populations in the San Joaquin Valley occur in mid-summer on the fourth and fifth crops of alfalfa.
Ray F. Smith, D. E. Bryan, W. W. Allen
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Male flight distance and population substructure in the bumblebee Bombus terrestris

Journal of Animal Ecology, 2008
1. Bumblebees are important pollinators in natural as well as agricultural ecosystems. Estimates of foraging range, population size and genetic population structure so far have been based on worker samples alone. Here we include both males and workers in a population genetic analysis to infer the contribution of males to these important ecological ...
F B, Kraus, S, Wolf, R F A, Moritz
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The flight to the suburbs of population and employment, 1960–1970

Journal of Urban Economics, 1982
Abstract This paper develops an econometric model of suburbanization, analyzing the changing location of both population (classified by income and race) and of employment (divided into four sectors) in 106 large SMSAs. The results confirm that the differential mobility of upper-income residents, and white residents, has been a powerful force ...
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Some new aspects of Lévy walks and flights: directed transport, manipulation through flights and population exchange

Physica D: Nonlinear Phenomena, 2004
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Denisov, Sergey Vadimovich, Klafter, J., Urbakh, M.   +2 more
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Population densities and optimal aircraft flight paths

Regional Studies, 1973
Hart P. E. (1973) Population densities and optimal aircraft flight paths, Reg. Studies 7, 137–151. The official policy of concentrating aircraft flight paths in Minimum Noise Routes is based on the famous Noise and Number Index (NNI) estimated from statistical surveys.
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Populism, Fake News, and the Flight From Democracy

2020
Fake news and populist movements that appear to hold the fate of democracy hostage are urgent concerns around the world.  The flight from liberal democracy toward oligarchy has spread out from the unexpected results of the 2016 American presidential elections bringing in a wave of reactionary populism and the beginning of a left populist counter ...
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Feeding cycles and flight activity in field populations of tsetse (Diptera:Glossinidae)

Bulletin of Entomological Research, 1978
AbstractPublished laboratory measurements of the levels of fat and haematin inGlossinafollowing a blood-meal were used to develop a prediction of the relationship between fat and haematin during the course of the feeding cycle. The fat-haematin relationship appears to be nearly linear over the later part of the feeding cycle.
Sarah E. Randolph, D. J. Rogers
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In-flight aid alignment with multi-population genetic algorithm in the Arctic

2015 34th Chinese Control Conference (CCC), 2015
Because of the limitations of the inertial navigation system, high accuracy navigation is a challenge for planes in the Arctic. One of the biggest problems is the initial alignment. Against the special conditions (high latitude and longitude astringe etc.) in the Arctic, new inertial navigation system mechanization equations are established, and a ...
Li Jing, Song Ningfang, Yang Gongliu, Liu Yuanyuan, Wang Jing   +4 more
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Risk of breast cancer in female flight attendants: a population-based study (Iceland)

Cancer Causes & Control, 2001
To study whether increased cancer risk, particularly of cancer types previously related to radiation, was found among cabin attendants, using employment time as a surrogate of exposure to cosmic radiation.A cohort of 1690 cabin attendants, 158 men and 1532 women from the Icelandic Cabin Crew Association and two airline companies in Iceland, was ...
V, Rafnsson, H, Tulinius, J G, Jónasson, J, Hrafnkelsson   +3 more
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