Results 221 to 230 of about 129,096 (265)

Gravity compensation for leachate grid cleaning robots in waste-to-energy plants: A modeling and simulation study. [PDF]

PLoS One
Cao A, Wang C, Li W, Ma H.
europepmc   +1 more source

Hypergravity exposure leads to persistent effects on geotaxis and activity in Drosophila melanogaster. [PDF]

J Exp Biol
Arumugam Amogh S, Horton S, Giraldo YM.
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Integrated geophysical, mineralogical, and geochemical investigation of gold and associated hydrothermal minerals in the Um Balad Area, Eastern Desert, Egypt. [PDF]

Sci Rep
H Mahmoud M, Hegab MAE, Elbshbeshi A, Araffa SAS.   +3 more
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Correction to "Construction of the Adjusted Scoliosis 3D Finite Element Model and Biomechanical Analysis under Gravity". [PDF]

Orthop Surg
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Beyond the Gravity Model

Journal of the Academy of Marketing Science, 1988
Gravity theory holds that more people will travel from a particular origin to a given destination than will travel to a more distant destination of the same type and size. Distance, according to gravity theory is a deterrent to travel and empirical evidence supports such a relationship in urban settings.
Mayo, Edward J., Jarvis, Lance P., Xander, James A.   +2 more
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A Note on Relaxed Gravity Models [PDF]

Environment and Planning A: Economy and Space, 1985
Relaxed gravity models, that is, gravity models with upper and lower bounds on the marginal totals, often have solutions with the property that the upper or lower bounds are satisfied with equality for most marginal totals. In this paper modifications are presented for the relaxed gravity models, which overcome this unwanted model property.
Å Hallefjord, K Jörnsten
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On the Sensitivity of the Gravity Model

SIAM Journal on Algebraic Discrete Methods, 1981
The gravity model is perhaps the most widely used mathematical method for predicting travel between subareas in an urban region. In this paper, we will consider the Evans-Kirby version of the model [Transpn. Res., 8 (1974), pp. 105–122]. A formula is derived which shows the sensitivity of the model to errors in data from the prediction year, say ten ...
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The Gravity Model [PDF]

Annual Review of Economics, 2011
Gravity has long been one of the most successful empirical models in economics. Incorporating deeper theoretical foundations of gravity into recent practice has led to a richer and more accurate estimation and interpretation of the spatial relations described by gravity. Wider acceptance has followed.
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An extension of the gravity model

Journal of the Operational Research Society, 2021
Tammy Drezner, Zvi Drezner, Dawit Zerom
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Reflections on gravity and entropy models

Regional Science and Urban Economics, 1975
Spatial interaction models are increasingly becoming a descriptive drvice for the dispersion and coherence of activities in a spatial sy~em. The major part of these models derive their theoretical perspective from notions 01 probable interactions over distance and are mainly based on gravity assumptions (or entropy assumptions).
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