Results 261 to 270 of about 107,723 (308)

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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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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