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  • 1
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    Posterior mediastinal masses: rare causes of cardiac compression (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: No abstract available
    Keywords: Life Sciences (General)
    Type: American heart journal (ISSN 0002-8703); Volume 124; 2; 523-6
    Format: text
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  • 2
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    Control of boundary layer transition location and plate vibration in the presence of an external acoustic field (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: The experiment is aimed at controlling the boundary layer transition location and the plate vibration when excited by a flow and an upstream sound source. Sound has been found to affect the flow at the leading edge and the response of a flexible plate in a boundary layer. Because the sound induces early transition, the panel vibration is acoustically coupled to the turbulent boundary layer by the upstream radiation. Localized surface heating at the leading edge delays the transition location downstream of the flexible plate. The response of the plate excited by a turbulent boundary layer (without sound) shows that the plate is forced to vibrate at different frequencies and with different amplitudes as the flow velocity changes indicating that the plate is driven by the convective waves of the boundary layer. The acoustic disturbances induced by the upstream sound dominate the response of the plate when the boundary layer is either turbulent or laminar. Active vibration control was used to reduce the sound induced displacement amplitude of the plate.
    Keywords: STRUCTURAL MECHANICS
    Type: In: Structural dynamics: Recent advances; Proceedings of the 4th International Conference, Univ. of Southampton, United Kingdom, July 15-18, 1991 (A93-45104 18-39); p. 702-711.
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  • 3
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    Comparison of the Physiology of the Spaceflight and Hindlimb Suspended Rat (1994)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The suspended rat has been used extensively as a simulation of the spaceflight animal. In suspension, hindlimbs are unloaded from the acceleration of gravity, much as they are in spaceflight. Comparisons of data from spaceflight (microgravity) and suspended (1G) rats have suggested that suspension my be an appropriate model, but no direct comparisons had been made between the spaceflight and suspended rat. Cosmos 2044 afforded the first opportunity to directly compare the effects of hindlimb suspension (HS) and spaceflight (SF) on a broad range of physiological and histological parameters. This paper reports on the comparison of skelton, skeletal muscle, heart, neural, pulmonary, kidney, liver, intestine, blood plasma, immune function, red blood cells, and endocrine and reproductive functions and systems.
    Keywords: Life Sciences (General)
    Type: US Experiments Flown on the Soviet Biosatellite Cosmos 2044; 273-281; NASA-TM-108802
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  • 4
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    Structural deformation of an orthotropic plate (1970)
    In:  CASI
    Details
    Publication Date: 2005-11-27
    Description: Ring reinforcements for damping structural deformation in orthotropic mirror design
    Keywords: STRUCTURAL MECHANICS
    Type: NASA, WASHINGTON OPT. TELESCOPE TECHNOL. 1970; P 283-286
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  • 5
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    A system for low field imaging of laser-polarized noble gas (1999)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: We describe a device for performing MRI with laser-polarized noble gas at low magnetic fields (〈50 G). The system is robust, portable, inexpensive, and provides gas-phase imaging resolution comparable to that of high field clinical instruments. At 20.6 G, we have imaged laser-polarized (3)He (Larmor frequency of 67 kHz) in both sealed glass cells and excised rat lungs, using approximately 0.1 G/cm gradients to achieve approximately 1 mm(2) resolution. In addition, we measured (3)He T(2)(*) times greater than 100 ms in excised rat lungs, which is roughly 20 times longer than typical values observed at high ( approximately 2 T) fields. We include a discussion of the practical considerations for working at low magnetic fields and conclude with evidence of radiation damping in this system. Copyright 1999 Academic Press.
    Keywords: Life Sciences (General)
    Type: Journal of magnetic resonance (San Diego, Calif. : 1997) (ISSN 1090-7807); Volume 141; 2; 217-27
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  • 6
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    VICONOPT - Program for exact vibration and buckling analysis or design of prismatic plate assemblies (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA Journal (ISSN 0001-1452); 29; 1927
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  • 7
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    Exact Bernoulli-Euler static stiffness matrix for a range of tapered beam-columns (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The static stiffnesses for torsional and flexural deformation of a tapered beam under axial loading are determined analytically, extending the Bernoulli-Euler/Bessel-function approach of Banerjee and Williams (1985). The derivation of the expressions is explained in detail, and numerical results for sample problems are presented in tables and shown to be in excellent agreement with those obtained using stepped beams of 400 or 500 elements.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal for Numerical Methods in Engineering (ISSN 0029-5981); 23; 1615-162
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  • 8
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    Buckling of simply supported plate assemblies subject to shear loading (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: An analysis is presented of the shear buckling load of an arbitrary simply-supported prismatic plate assembly or stiffened panel configuration. The method utilizes stiffness matrices developed by Wittrick (1968). For the restraint of simple support along edges perpendicular to the longitudinal direction, various wavelengths of response are combined using an energy method that involves only a boundary integral. Numerical results for plate and panel configurations show the accuracy and convergence of the method.
    Keywords: STRUCTURAL MECHANICS
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  • 9
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    Inclusion of elastically connected members in exact buckling and frequency calculations (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A standard stiffness matrix procedure which permits any combination of rigid, elastic, pinned or sliding connections of the degrees of freedom at the ends of a member to the nodes of its parent structure is described, in order to show how easily it can be extended to allow an existing algorithm to be used to ensure that no eigenvalues of the parent structure can be missed even when 'exact' member theory is used. The eigenvalues are the natural frequencies of undamped free vibration analyses or the critical load factors of buckling problems. The method preserves the exactness of the member theory and an efficient method for computer application is indicated. The theory also permits any combination of rigid, elastic, pinned or sliding connections between the freedoms of a substructure and those of its parent structure.
    Keywords: STRUCTURAL MECHANICS
    Type: Computers and Structures (ISSN 0045-7949); 22; 3, 19
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  • 10
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    Dynamic buckling of shallow arches (1971)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Symmetric and asymmetric dynamic buckling of shallow elastic arches under uniform loads, using nonlinear finite difference method
    Keywords: STRUCTURAL MECHANICS
    Type: ; ADEMIE DES SCIENCES
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