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Steven E Euerle - One of the best experts on this subject based on the ideXlab platform.
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under ice noise resulting from thermally induced fracturing of the arctic ice pack theory and a test case application
Journal of Geophysical Research, 2000Co-Authors: Peter J Stein, James K Lewis, James C Parinella, Steven E EuerleAbstract:A theory is presented that relates thermally induced fracturing of pack ice to under-ice noise level variations. It begins with the governing equations for the Thermomechanics of pack ice. The Thermomechanics relates thermally induced strain rates to the stresses within various vertical layers of the floe. In addition, paradigms are developed which specify the relative quantity of fracturing and stress relief in the floe as the tensile yield strength of the ice is exceeded. The Thermomechanics is complemented by an acoustic propagation model that relates the number of fracture events at a given time to the acoustic levels at arbitrary frequency and depth below the ice. The acoustic theory assumes that each fracture acts as a simple monopole source, the fractures are evenly distributed horizontally, and the energy of each fracture propagates through the ice and the water column on the basis of the governing equations for elastic waves in a horizontally stratified medium. The results indicate that noise episodes resulting from fracturing occurring over the top 40 cm of a 160 cm thick floe will propagate over distances of up to 100 km. However, noise episodes associated with fracturing occurring in the lower 100 cm of the floe will only propagate over a range of ∼10 km. The Thermomechanics and acoustic propagation theories were used to develop a numerical model for predicting under-ice noise levels for a given thermal forcing of floes within the arctic ice pack. The model was used to simulate stresses in a multiyear floe and under-ice noise levels at 500 Hz at 305 m below the floe. Model-predicted ice stresses and under-ice noise levels compare quite well to observed stresses and noise variations during the fall of 1988 in the eastern Arctic Ocean. The model predicts that most of the thermally induced, under-ice noise at 500 Hz was a result of fracturing occurring between 5 and 30 cm below the ice surface for a 1.6 m thick multiyear floe.
Peter J Stein - One of the best experts on this subject based on the ideXlab platform.
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under ice noise resulting from thermally induced fracturing of the arctic ice pack theory and a test case application
Journal of Geophysical Research, 2000Co-Authors: Peter J Stein, James K Lewis, James C Parinella, Steven E EuerleAbstract:A theory is presented that relates thermally induced fracturing of pack ice to under-ice noise level variations. It begins with the governing equations for the Thermomechanics of pack ice. The Thermomechanics relates thermally induced strain rates to the stresses within various vertical layers of the floe. In addition, paradigms are developed which specify the relative quantity of fracturing and stress relief in the floe as the tensile yield strength of the ice is exceeded. The Thermomechanics is complemented by an acoustic propagation model that relates the number of fracture events at a given time to the acoustic levels at arbitrary frequency and depth below the ice. The acoustic theory assumes that each fracture acts as a simple monopole source, the fractures are evenly distributed horizontally, and the energy of each fracture propagates through the ice and the water column on the basis of the governing equations for elastic waves in a horizontally stratified medium. The results indicate that noise episodes resulting from fracturing occurring over the top 40 cm of a 160 cm thick floe will propagate over distances of up to 100 km. However, noise episodes associated with fracturing occurring in the lower 100 cm of the floe will only propagate over a range of ∼10 km. The Thermomechanics and acoustic propagation theories were used to develop a numerical model for predicting under-ice noise levels for a given thermal forcing of floes within the arctic ice pack. The model was used to simulate stresses in a multiyear floe and under-ice noise levels at 500 Hz at 305 m below the floe. Model-predicted ice stresses and under-ice noise levels compare quite well to observed stresses and noise variations during the fall of 1988 in the eastern Arctic Ocean. The model predicts that most of the thermally induced, under-ice noise at 500 Hz was a result of fracturing occurring between 5 and 30 cm below the ice surface for a 1.6 m thick multiyear floe.
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under ice noise resulting from thermally induced fracturing of the arctic ice pack theory and a test case application
Journal of the Acoustical Society of America, 1999Co-Authors: Peter J Stein, James K Lewis, James C ParinellaAbstract:A theory is presented relating thermally induced fracturing of pack ice to under‐ice noise. The Thermomechanics of pack ice relates thermally induced strain rates to stresses within various layers of the floe. Paradigms are used to specify the relative quantity of fracturing and stress relief as the ice tensile yield strength ice is exceeded. The Thermomechanics is complemented by an acoustic model that relates the number of fracture events to acoustic levels at arbitrary frequency and depth below the ice. This theory assumes each fracture acts as a monopole source, the fractures are evenly distributed horizontally, and the energy of each fracture propagates through the ice and water as elastic waves in a stratified media. Noise from fracturing occurring over the top 40 cm of a 160‐cm‐thick floe will propagate over distances of ∼100 km. However, noise from fracturing occurring in the lower 100 cm of the floe will only propagate ∼10 km. The theories were used to develop a numerical model for predicting und...
James C Parinella - One of the best experts on this subject based on the ideXlab platform.
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under ice noise resulting from thermally induced fracturing of the arctic ice pack theory and a test case application
Journal of Geophysical Research, 2000Co-Authors: Peter J Stein, James K Lewis, James C Parinella, Steven E EuerleAbstract:A theory is presented that relates thermally induced fracturing of pack ice to under-ice noise level variations. It begins with the governing equations for the Thermomechanics of pack ice. The Thermomechanics relates thermally induced strain rates to the stresses within various vertical layers of the floe. In addition, paradigms are developed which specify the relative quantity of fracturing and stress relief in the floe as the tensile yield strength of the ice is exceeded. The Thermomechanics is complemented by an acoustic propagation model that relates the number of fracture events at a given time to the acoustic levels at arbitrary frequency and depth below the ice. The acoustic theory assumes that each fracture acts as a simple monopole source, the fractures are evenly distributed horizontally, and the energy of each fracture propagates through the ice and the water column on the basis of the governing equations for elastic waves in a horizontally stratified medium. The results indicate that noise episodes resulting from fracturing occurring over the top 40 cm of a 160 cm thick floe will propagate over distances of up to 100 km. However, noise episodes associated with fracturing occurring in the lower 100 cm of the floe will only propagate over a range of ∼10 km. The Thermomechanics and acoustic propagation theories were used to develop a numerical model for predicting under-ice noise levels for a given thermal forcing of floes within the arctic ice pack. The model was used to simulate stresses in a multiyear floe and under-ice noise levels at 500 Hz at 305 m below the floe. Model-predicted ice stresses and under-ice noise levels compare quite well to observed stresses and noise variations during the fall of 1988 in the eastern Arctic Ocean. The model predicts that most of the thermally induced, under-ice noise at 500 Hz was a result of fracturing occurring between 5 and 30 cm below the ice surface for a 1.6 m thick multiyear floe.
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under ice noise resulting from thermally induced fracturing of the arctic ice pack theory and a test case application
Journal of the Acoustical Society of America, 1999Co-Authors: Peter J Stein, James K Lewis, James C ParinellaAbstract:A theory is presented relating thermally induced fracturing of pack ice to under‐ice noise. The Thermomechanics of pack ice relates thermally induced strain rates to stresses within various layers of the floe. Paradigms are used to specify the relative quantity of fracturing and stress relief as the ice tensile yield strength ice is exceeded. The Thermomechanics is complemented by an acoustic model that relates the number of fracture events to acoustic levels at arbitrary frequency and depth below the ice. This theory assumes each fracture acts as a monopole source, the fractures are evenly distributed horizontally, and the energy of each fracture propagates through the ice and water as elastic waves in a stratified media. Noise from fracturing occurring over the top 40 cm of a 160‐cm‐thick floe will propagate over distances of ∼100 km. However, noise from fracturing occurring in the lower 100 cm of the floe will only propagate ∼10 km. The theories were used to develop a numerical model for predicting und...
James K Lewis - One of the best experts on this subject based on the ideXlab platform.
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under ice noise resulting from thermally induced fracturing of the arctic ice pack theory and a test case application
Journal of Geophysical Research, 2000Co-Authors: Peter J Stein, James K Lewis, James C Parinella, Steven E EuerleAbstract:A theory is presented that relates thermally induced fracturing of pack ice to under-ice noise level variations. It begins with the governing equations for the Thermomechanics of pack ice. The Thermomechanics relates thermally induced strain rates to the stresses within various vertical layers of the floe. In addition, paradigms are developed which specify the relative quantity of fracturing and stress relief in the floe as the tensile yield strength of the ice is exceeded. The Thermomechanics is complemented by an acoustic propagation model that relates the number of fracture events at a given time to the acoustic levels at arbitrary frequency and depth below the ice. The acoustic theory assumes that each fracture acts as a simple monopole source, the fractures are evenly distributed horizontally, and the energy of each fracture propagates through the ice and the water column on the basis of the governing equations for elastic waves in a horizontally stratified medium. The results indicate that noise episodes resulting from fracturing occurring over the top 40 cm of a 160 cm thick floe will propagate over distances of up to 100 km. However, noise episodes associated with fracturing occurring in the lower 100 cm of the floe will only propagate over a range of ∼10 km. The Thermomechanics and acoustic propagation theories were used to develop a numerical model for predicting under-ice noise levels for a given thermal forcing of floes within the arctic ice pack. The model was used to simulate stresses in a multiyear floe and under-ice noise levels at 500 Hz at 305 m below the floe. Model-predicted ice stresses and under-ice noise levels compare quite well to observed stresses and noise variations during the fall of 1988 in the eastern Arctic Ocean. The model predicts that most of the thermally induced, under-ice noise at 500 Hz was a result of fracturing occurring between 5 and 30 cm below the ice surface for a 1.6 m thick multiyear floe.
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under ice noise resulting from thermally induced fracturing of the arctic ice pack theory and a test case application
Journal of the Acoustical Society of America, 1999Co-Authors: Peter J Stein, James K Lewis, James C ParinellaAbstract:A theory is presented relating thermally induced fracturing of pack ice to under‐ice noise. The Thermomechanics of pack ice relates thermally induced strain rates to stresses within various layers of the floe. Paradigms are used to specify the relative quantity of fracturing and stress relief as the ice tensile yield strength ice is exceeded. The Thermomechanics is complemented by an acoustic model that relates the number of fracture events to acoustic levels at arbitrary frequency and depth below the ice. This theory assumes each fracture acts as a monopole source, the fractures are evenly distributed horizontally, and the energy of each fracture propagates through the ice and water as elastic waves in a stratified media. Noise from fracturing occurring over the top 40 cm of a 160‐cm‐thick floe will propagate over distances of ∼100 km. However, noise from fracturing occurring in the lower 100 cm of the floe will only propagate ∼10 km. The theories were used to develop a numerical model for predicting und...
Victor H Barocas - One of the best experts on this subject based on the ideXlab platform.
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a structural kinetic model of soft tissue Thermomechanics
Biophysical Journal, 2008Co-Authors: Triantafyllos Stylianopoulos, Alptekin Aksan, Victor H BarocasAbstract:A structure-based kinetic model was developed to predict the thermomechanical response of collagenous soft tissues. The collagen fibril was represented as an ensemble of molecular arrays with cross-links connecting the collagen molecules within the same array. A two-state kinetic model for protein folding was employed to represent the native and the denatured states of the collagen molecule. The Monte Carlo method was used to determine the state of the collagen molecule when subjected to thermal and mechanical loads. The model predictions were compared to existing experimental data for New Zealand white rabbit patellar tendons. The model predictions for one-dimensional tissue shrinkage and the corresponding mechanical property degradation agreed well with the experimental data, showing that the gross tissue behavior is dictated by molecular-level phenomena.
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a structural kinetic model of soft tissue Thermomechanics
2007 ASME Summer Bioengineering Conference SBC 2007, 2007Co-Authors: Triantafyllos Stylianopoulos, Alptekin Aksan, Victor H BarocasAbstract:Sub-ablative heating of collagenous soft tissues is central to thermal therapies such as thermal capsulorrhaphy, thermokeratoplasty and skin resurfacing [1]. These therapies target the heat-induced denaturation of the collagen molecule, which starts in a temperature range of 55–75 °C. There are relatively few theoretical studies describing the heat-induced alterations in soft tissues, which are mainly phenomenological [2]. In this work, a methodology for studying the kinetics of soft tissue Thermomechanics is presented and used to predict the thermal response of New Zealand white patellar tendons [3]. The modeling approach accounts for the microstructure of the tissue and utilizes information at the single-molecule level to obtain the macroscopic response.Copyright © 2007 by ASME
