Results 11 to 20 of about 203,990 (252)

Hyperspectral cathodoluminescence imaging of modern and fossil carbonate shells [PDF]

open access: yes, 2006
Optical cathodoluminescence (CL) is commonly used to identify diagenetically altered carbonate fossils, yet such an interpretation is problematic as present-day carbonate shells may also luminesce.
Martin, Robert   +19 more
core   +4 more sources

Turbulent 3D MHD dynamo model in spherical shells: regular oscillations of the dipolar field [PDF]

open access: yes, 2010
We report the results of three-dimensional numerical simulations of convection-driven dynamos in relatively thin rotating spherical shells that show a transition from an strong non-oscillatory dipolar magnetic field to a weaker regularly oscillating ...
Simitev, R.D.   +2 more
core   +7 more sources

On Long-Range Characteristic Length Scales of Shell Structures

open access: yesEng, 2023
Shell structures have a rich family of boundary layers including internal layers. Each layer has its own characteristic length scale, which depends on the thickness of the shell.
Harri Hakula
doaj   +1 more source

Effects of Internal Boundary Layers and Sensitivity on Frequency Response of Shells of Revolution

open access: yesVibration, 2023
New applications introduced capsule designs with features that have not been fully analysed in the literature. In this study, thin shells of revolution are used to model drug delivery capsules both with closed and open designs including perforations. The
Harri Hakula
doaj   +1 more source

Matter-Robotic Calibration for Bioshotcrete

open access: yesTemes de Disseny, 2018
Construction techniques associated with traditional raw earth architecture are characterised by laborious manual tasks in which each clay mix is deposited in layers over a light formwork, such as with the wattle and daub technique.
Maite Bravo   +2 more
doaj   +3 more sources

The continuous method of solution continuation with respect to the best parameter in the calculation of shell structures

open access: yesУчёные записки Казанского университета: Серия Физико-математические науки, 2019
The paper considers the numerical solution process of the strength and stability problems of thin-walled shell structures taking into account the geometric nonlinearity, transverse shifts, and material orthotropy.
A.A. Semenov, S.S. Leonov
doaj   +1 more source

Supersonic Flutter of Circular Cylindrical Shells [PDF]

open access: yes, 1966
Various experimental and theoretical studies on the supersonic flutter of circular cylindrical shells are discussed. Results of experiments in the Mach number range 2.5 - 3.5 are presented.
Olson, Mervyn Daniel
core   +1 more source

Overwintering of Spiders in Terrestrial Molluscs Shells in the Wider Area of Vranov nad Topľou (Slovakia)

open access: yesActa Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2017
Overwintering of spiders in empty snail shells is a little studied topic and in Slovakia similar research has not been carried out yet. Collecting shells was carried out in the eastern part of Slovakia, in winter at the turn of 2012/2013 and 2013/2014 ...
Kristína Štempáková, Vladimír Hula
doaj   +1 more source

A numerical investigation into the plastic buckling paradox for circular cylindrical shells under axial compression [PDF]

open access: yes, 2014
It is widely accepted that for many buckling problems of plates and shells in the plastic range the flow theory of plasticity leads to a significant overestimation of the buckling stress while the deformation theory provides much more accurate ...
GUARRACINO, FEDERICO   +7 more
core   +1 more source

A new algorithm for near–singular integration of 3D Boundary Element Integrals for thin–walled elements

open access: yesRevista Facultad de Ingeniería Universidad de Antioquia, 2015
The accuracy of the Boundary Element Method (BEM) is strongly dependent on an accurate evaluation of boundary integrals. For thin-walled structures, collocation points and integration elements are often very close, making the kernel of the integrations ...
Marco Antonio González De León   +2 more
doaj   +1 more source

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