Results 41 to 50 of about 1,084,546 (254)

Buckling stress relation equations of box beam under compression and torsion

open access: yesNihon Kikai Gakkai ronbunshu, 2014
Recently, high strength steel is used increasingly for plates which constitute the frame structures of vehicles. Since these plates become thinner, the buckling on the plates has been recognized as an important issue for automotive industries.
Katsuya FURUSU   +4 more
doaj   +1 more source

Significantly improving strength and plasticity of Al-based composites by in-situ formed AlCoCrFeNi core–shell structure

open access: yesJournal of Materials Research and Technology, 2021
The mechanical properties of Al matrix composites reinforced by AlCoCrFeNi high entropy alloy particles were greatly enhanced after spark plasma sintering at 600 °C accompanied with the formation of reinforcement core–shell structure.
Yunzi Liu   +4 more
doaj   +1 more source

Economic and heating efficiency analysis of double-shell downhole electric heater for tar-rich coal in-situ conversion

open access: yesCase Studies in Thermal Engineering, 2023
Downhole electric heater studied in this paper is used for tar-rich coal in-situ conversion, and the closed double-shell structure is proposed to improve the performance and economy of heater.
Zhendong Wang   +7 more
doaj   +1 more source

Supershell structure in trapped dilute Fermi gases

open access: yes, 2005
We show that a dilute harmonically trapped two-component gas of fermionic atoms with a weak repulsive interaction has a pronounced super-shell structure: the shell fillings due to the spherical harmonic trapping potential are modulated by a beat mode ...
Aa. Bohr   +8 more
core   +1 more source

Level set-based topology optimization of thin plate structure for maximizing stiffness under out-of-plane deformation

open access: yesNihon Kikai Gakkai ronbunshu, 2014
The topology optimization method using the level set method and incorporating a fictitious interface energy derived from the phase field method was proposed by part of the authors.
Hitoshi HORIO   +4 more
doaj   +1 more source

FP Shell Effective Interactions and Nuclear Shell Structure of 44Sc

open access: yesEast European Journal of Physics, 2023
: Nuclear energy levels in 44Sc isotope, with fp shell model space occupation low levels fp-LS shell within shell model calculations had been investigated.
Maryam K. Hassan, Firas Z. Majeed
doaj   +1 more source

Influence of the geometrical researches of ruled surfaces on design of unique structures

open access: yesStructural Mechanics of Engineering Constructions and Buildings, 2019
Aims of research. Due to the growing interest in the design, calculation and application of architectural structures and structures in the form of a variety of smooth and composite surfaces, it is interesting to illustrate the use of analytical surfaces,
Iraida A. Mamieva
doaj   +1 more source

Optical and Infrared Imaging and Spectroscopy of the Multiple-Shell Planetary Nebula NGC 6369

open access: yes, 2011
NGC 6369 is a double-shell planetary nebula (PN) consisting of a bright annular inner shell with faint bipolar extensions and a filamentary envelope. We have used ground- and space-based narrow-band optical and near-IR images, broad-band mid-IR images ...
Acosta Pulido   +48 more
core   +1 more source

The structure of circumstellar shells [PDF]

open access: yesThe Astrophysical Journal, 1988
This document provides a report on research activities carried out with the support of NASA grant NAG 5-1174, the Structure of Circumstellar Shells, funded under the Astrophysics Data Program. The research carried out with the support of this grant is a study of the properties of circumstellar dust shells for which spectra are available through IRAS ...
John D. Fix, Michael L. Cobb
openaire   +1 more source

Onset of Rotational Damping in Superdeformed Nuclei

open access: yes, 1996
We discuss damping of the collective rotational motion in $A\sim 150$ superdeformed nuclei by means of a shell model combining the cranked Nilsson mean-filed and the surface-delta two-body residual force.
Anderson   +35 more
core   +1 more source

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