Global ETD Search
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Showing 1 to 10 of 10 for “"mechanical relaxation"”.
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Investigation of the optical, thermal, and mechanical properties of a bulk polymer using the surface thermal lensing technique
… Lensing (STL) was employed to study the thermo-mechanical response of an amorphous polycarbonate as a bulk. A discussion is given of how previously developed theories did not fit well with the present work. Therefore, only qualitative analysis and discussion of the experimental results is made, …
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Ultrasonic viscoelasticity imaging of nonpalpable breast lesions
… malignant and benign lesions. The mechanical relaxation time T1 images showed a tissue-specific T1 contrast that is negative for all 11 malignant lesions and positive for all 10 benign lesions. Strain images were estimated using a regularized multi-scale optical flow (ROF) …
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Fundamental adhesive studies of block copolymers
… sensitive adhesives. The thermal and the dynamic mechanical behavior of linear styrene/isoprene/styrene triblock copolymers (40% and 50% by weight styrene) was determined for free films and for films bonding together two rigid adherends. Damping phenomena indicated a broader mechanical relaxation …
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Mechanical relaxations, spin glasses and 1/f resistance noise
… and iron to demonstrate a connection between mechanical anelastic relaxations and electrical 1/f noise from the motion of defects. We have found that the connection between 1/f noise and mechanical relaxation is more complex than was originally believed and depends critically on the relevant …
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Mechanical relaxations, spin glasses and 1/f resistance noise
… and iron to demonstrate a connection between mechanical anelastic relaxations and electrical 1/f noise from the motion of defects. We have found that the connection between 1/f noise and mechanical relaxation is more complex than was originally believed and depends critically on the relevant …
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Understanding of the mechanical response of semicrystalline polymers based on the block-like substructure of crystalline lamellae
We investigated the mechanical response of a range of PE and sPP samples as models of semi-crystalline polymer systems under tensile deformation. Splitting the total tensile deformation into elastic and plastic parts shows four characteristic points (A,B,C and D) from the true stress-true strain …
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Cryogenic penetration and relaxation behavior of dry and icy lunar regolith simulants
… concepts require detailed knowledge of the mechanical properties of dry and ice-saturated regolith. This study aims to characterize two lunar regolith simulants using a specially-designed penetrometer at various conditions of temperature, pressure, density, and ice content. We measured …
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Toward ultra-broadband photoacoustic spectroscopy of supercooled liquids
… of the dramatic slow-down of structural relaxation dynamics in supercooled liquids leading to the glass transition is limited in part by the lack of data in these systems. Between the melting point and the glass transition, the viscosity of supercooled liquids can change by 16 orders of …
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Structure-Property Relationships: Model Studies on Melt Extruded Uniaxially Oriented High Density Polyethylene Films Having Well Defined Morphologies
… different subjects that were addressed are: 1) mechanical properties and deformation morphologies, 2) orientation anisotropy of the dynamic mechanical α relaxation, 3) orientation dependence of creep behavior, and 4) crystalline lamellar thickness and its distribution. For the first three …
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The Cellular Basis for Hearing
… for hearing. Their primary role is to convert mechanical signal into electrical signal through the ion channels, called ``mechano-electrical transducer (MET) channels'', in the hair bundles of hair cells. Another important function of hair cells is to reciprocally amplify the mechanical input …