Results 231 to 240 of about 71,077 (260)

Some links between turtle geometry and analytic geometry

International Journal of Mathematical Education in Science and Technology, 1985
The computer language LOGO facilitates the teaching of analytic geometry and calculus from the notion of curvature, through its ‘turtle geometry’ facility [2]. We provide some theoretical basis for finding turtle geometry equivalents of familiar curves in analytic geometry, and vice versa, by some simple methods which apparently have not been noticed ...
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Multiple Coordination Geometries Supported by Methylene-Linked Guanidines

Inorganic Chemistry, 2004
The methylene-linked bicyclic guanidine based on the 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine (hppH) framework provides a versatile platform able to support trigonal-planar, tetrahedral, and square-planar metal centers.
Sarah H, Oakley, Martyn P, Coles, Peter B, Hitchcock   +2 more
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Linking Structure and Parametric Geometry

Architectural Design, 2013
AbstractThe Karamba plug‐in developed by Clemens Preisinger in collaboration with Bollinger + Grohmann Engineers has been developed to predict the behaviour of structures under external loads. Intended to be used by architects rather than being solely confined to an engineering setting, it enables a seamless flow of data between structural and ...
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Diverse calving patterns linked to glacier geometry

Nature Geoscience, 2013
Iceberg calving—implicated in the retreat of ice shelves—is a complex process constrained by few observations. Numerical simulations suggest that the pattern of iceberg calving is controlled by the geometry of the glacier, and that regions of Greenland and Antarctica may be particularly vulnerable to catastrophic calving-driven retreat.
J. N. Bassis, S. Jacobs
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Geometry of Alternating Links

1997
An alternating diagram for a link is, as explained in Chapter 1, one in which the over or under nature of the crossings alternates along every link-component in the diagram; the crossings always go “… over, under, over, under,…” when considered from any starting point. A link is said to be alternating if it possesses such a diagram.
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Functional Cross-Linked Hemoglobin Bis-tetramers: Geometry and Cooperativity

Biochemistry, 2008
Hemoglobin-based oxygen carriers have been sought as stable, sterile alternatives to red cells in transfusions. Problems in clinical trials using cross-linked tetramers have led to proposals that larger assemblies of tetramers may alleviate some of the problems.
Dongxin, Hu, Ronald, Kluger
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Conductance and Geometry of Pyridine-Linked Single-Molecule Junctions

Journal of the American Chemical Society, 2010
We have measured the conductance and characterized molecule-electrode binding geometries of four pyridine-terminated molecules by elongating and then compressing gold point contacts in a solution of molecules. We have found that all pyridine-terminated molecules exhibit bistable conductance signatures, signifying that the nature of the pyridine-gold ...
M, Kamenetska, Su Ying, Quek, A C, Whalley, M L, Steigerwald, H J, Choi, Steven G, Louie, C, Nuckolls, M S, Hybertsen, J B, Neaton, L, Venkataraman   +9 more
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Some problematic links between hunting and geometry

Behavioral and Brain Sciences, 1996
AbstractGeary's emphasis on hunting ignores the possible importance of other human activities, such as scavenging and gathering, in the evolution of spatial abilities. In addition, there is little evidence that links spatial abilities and math skills. Furthermore, such links have little practical importance given the small size of most differences and ...
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Stable Geometry of a Plane Five-Link Mechanism

Russian Engineering Research, 2018
A five-link mechanism of parallel structure with rotary kinematic pairs is considered. Possible configurations of the mechanism, its working regions, and singular positions are discussed. Possible optimization of its working zone without singular positions of the second kind is analyzed.
M. N. Zakharov, P. A. Laryushkin, K. G. Erastova   +2 more
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Links to Literature: Exploring Real-World Geometry

Teaching Children Mathematics, 2003
Geometry should be a natural and integral part of the mathematics curriculum for elementary students (NCTM 2000). The study of geometry should include a range of activities, from identifying shapes to higher-order processes such as investigating properties of shapes, exploring geometric relationships, and posing and solving geometric problems.
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