The Experts below are selected from a list of 3069 Experts worldwide ranked by ideXlab platform
B. Myslimaj - One of the best experts on this subject based on the ideXlab platform.
-
DESIRABLE STRENGTH Distribution FOR ASYMMETRIC STRUCTURES WITH STRENGTH-Stiffness DEPENDENT ELEMENTS
Journal of Earthquake Engineering, 2004Co-Authors: B. Myslimaj, W. K. TsoAbstract:Recent studies have shown that for many reinforced concrete lateral force-resisting elements (LFRE) Stiffness is dependent on strength, and as a result strength assign-ment to these elements would affect both the strength and Stiffness Distributions in a structure. As a consequence, Stiffness Distribution cannot be considered known prior to strength assignment. This implies that in assigning strength to LFRE, the designer has the ability not only to prescribe the strength Distribution, but also indirectly control the Stiffness Distribution in the structure. In this paper, a study is made on the seis-mic performance of a number of single-story structures to reconfirm that the “balanced CV-CR location” criterion, previously suggested by the writers, constitutes a desirable strength/Stiffness Distribution for minimising torsional response of asymmetric reinforced concrete structures.
-
a yield displacement Distribution based approach for strength assignment to lateral force resisting elements having strength dependent Stiffness
Earthquake Engineering & Structural Dynamics, 2003Co-Authors: W. K. Tso, B. MyslimajAbstract:Recent studies have shown that for many lateral force-resisting elements (LFRE) Stiffness is dependent on strength, and as a result strength assignment to these elements would affect both the strength and Stiffness Distributions in a structure. Consequently, Stiffness Distribution cannot be considered known prior to strength assignment. This paper presents a yield displacement Distribution-based strength assignment strategy that does not require the knowledge of Stiffness Distribution prior to strength assignment. It is shown that structural systems with their center of rigidity (CR) and center of strength (CV) located on the opposite sides of the center of mass (CM) will have small torsional responses under seismic excitation. Copyright © 2003 John Wiley Sons, Ltd.
-
A yield displacement Distribution‐based approach for strength assignment to lateral force‐resisting elements having strength dependent Stiffness
Earthquake Engineering & Structural Dynamics, 2003Co-Authors: W. K. Tso, B. MyslimajAbstract:Recent studies have shown that for many lateral force-resisting elements (LFRE) Stiffness is dependent on strength, and as a result strength assignment to these elements would affect both the strength and Stiffness Distributions in a structure. Consequently, Stiffness Distribution cannot be considered known prior to strength assignment. This paper presents a yield displacement Distribution-based strength assignment strategy that does not require the knowledge of Stiffness Distribution prior to strength assignment. It is shown that structural systems with their center of rigidity (CR) and center of strength (CV) located on the opposite sides of the center of mass (CM) will have small torsional responses under seismic excitation. Copyright © 2003 John Wiley Sons, Ltd.
Le Hang Guo - One of the best experts on this subject based on the ideXlab platform.
-
Stiffness Distribution in the ablated zone after radiofrequency ablation for liver an ex vivo study with a tissue elastometer
Clinical Hemorheology and Microcirculation, 2019Co-Authors: Dan Wang, Bo Ji Liu, Le Hang Guo, Shigao ChenAbstract:OBJECTIVE To investigate the Stiffness Distribution in the ablated zone after radiofrequency ablation (RFA), we used a device called tissue elastometer based on gross liver samples. MATERIALS AND METHODS: Twelve freshly excised porcine livers were subject to RFA under a same setup to form elliptic ablated samples. Each sample was cut open for gross examination, and then the surface of the section plane was sliced into one piece for Young's modulus test using the tissue elastometer. Five test points along the long- and short-axis on each piece were selected to evaluate Stiffness Distribution respectively. Among them, four points distributed equidistantly from center to boundary in the ablated zone and one was in the unablated zone. RESULTS In the ablated zone, we found the Young's moduli were significantly different among the four test points both in long- (F = 99.04, p <0.001) and short-axis (F = 79.47, p <0.001) directions. The Young's modulus showed a downtrend in each direction, and was linearly related to the distance from the center to the test point (for long axis, R2 = 0.968; for short axis, R2 = 0.984, both p <0.001). A more significant downtrend was observed in short-axis direction. The Young's moduli gained from the inner edge of ablated zone were comparable and significantly higher than those from the outer edge for both directions. The maximum value of 24.71kPa for Young's modulus was the appropriate threshold to ensure the tissues were necrotic completely. CONCLUSION The Stiffness inside the ablated zone represented a radial Distribution with downtrend, following a linear law. The Stiffness at the inner edge of ablated zone is stable and significantly higher than that at the outer edge. The maximum value of 24.71 kPa close to the inner edge of Wz may be used as the standard of complete ablation.
Shigao Chen - One of the best experts on this subject based on the ideXlab platform.
-
Stiffness Distribution in the ablated zone after radiofrequency ablation for liver: An ex-vivo study with a tissue elastometer.
Clinical Hemorheology and Microcirculation, 2019Co-Authors: Le Hang Guo, Dan Wang, Bo Ji Liu, Shigao ChenAbstract:OBJECTIVE To investigate the Stiffness Distribution in the ablated zone after radiofrequency ablation (RFA), we used a device called tissue elastometer based on gross liver samples. MATERIALS AND METHODS: Twelve freshly excised porcine livers were subject to RFA under a same setup to form elliptic ablated samples. Each sample was cut open for gross examination, and then the surface of the section plane was sliced into one piece for Young's modulus test using the tissue elastometer. Five test points along the long- and short-axis on each piece were selected to evaluate Stiffness Distribution respectively. Among them, four points distributed equidistantly from center to boundary in the ablated zone and one was in the unablated zone. RESULTS In the ablated zone, we found the Young's moduli were significantly different among the four test points both in long- (F = 99.04, p
-
Stiffness Distribution in the ablated zone after radiofrequency ablation for liver an ex vivo study with a tissue elastometer
Clinical Hemorheology and Microcirculation, 2019Co-Authors: Dan Wang, Bo Ji Liu, Le Hang Guo, Shigao ChenAbstract:OBJECTIVE To investigate the Stiffness Distribution in the ablated zone after radiofrequency ablation (RFA), we used a device called tissue elastometer based on gross liver samples. MATERIALS AND METHODS: Twelve freshly excised porcine livers were subject to RFA under a same setup to form elliptic ablated samples. Each sample was cut open for gross examination, and then the surface of the section plane was sliced into one piece for Young's modulus test using the tissue elastometer. Five test points along the long- and short-axis on each piece were selected to evaluate Stiffness Distribution respectively. Among them, four points distributed equidistantly from center to boundary in the ablated zone and one was in the unablated zone. RESULTS In the ablated zone, we found the Young's moduli were significantly different among the four test points both in long- (F = 99.04, p <0.001) and short-axis (F = 79.47, p <0.001) directions. The Young's modulus showed a downtrend in each direction, and was linearly related to the distance from the center to the test point (for long axis, R2 = 0.968; for short axis, R2 = 0.984, both p <0.001). A more significant downtrend was observed in short-axis direction. The Young's moduli gained from the inner edge of ablated zone were comparable and significantly higher than those from the outer edge for both directions. The maximum value of 24.71kPa for Young's modulus was the appropriate threshold to ensure the tissues were necrotic completely. CONCLUSION The Stiffness inside the ablated zone represented a radial Distribution with downtrend, following a linear law. The Stiffness at the inner edge of ablated zone is stable and significantly higher than that at the outer edge. The maximum value of 24.71 kPa close to the inner edge of Wz may be used as the standard of complete ablation.
W. K. Tso - One of the best experts on this subject based on the ideXlab platform.
-
DESIRABLE STRENGTH Distribution FOR ASYMMETRIC STRUCTURES WITH STRENGTH-Stiffness DEPENDENT ELEMENTS
Journal of Earthquake Engineering, 2004Co-Authors: B. Myslimaj, W. K. TsoAbstract:Recent studies have shown that for many reinforced concrete lateral force-resisting elements (LFRE) Stiffness is dependent on strength, and as a result strength assign-ment to these elements would affect both the strength and Stiffness Distributions in a structure. As a consequence, Stiffness Distribution cannot be considered known prior to strength assignment. This implies that in assigning strength to LFRE, the designer has the ability not only to prescribe the strength Distribution, but also indirectly control the Stiffness Distribution in the structure. In this paper, a study is made on the seis-mic performance of a number of single-story structures to reconfirm that the “balanced CV-CR location” criterion, previously suggested by the writers, constitutes a desirable strength/Stiffness Distribution for minimising torsional response of asymmetric reinforced concrete structures.
-
a yield displacement Distribution based approach for strength assignment to lateral force resisting elements having strength dependent Stiffness
Earthquake Engineering & Structural Dynamics, 2003Co-Authors: W. K. Tso, B. MyslimajAbstract:Recent studies have shown that for many lateral force-resisting elements (LFRE) Stiffness is dependent on strength, and as a result strength assignment to these elements would affect both the strength and Stiffness Distributions in a structure. Consequently, Stiffness Distribution cannot be considered known prior to strength assignment. This paper presents a yield displacement Distribution-based strength assignment strategy that does not require the knowledge of Stiffness Distribution prior to strength assignment. It is shown that structural systems with their center of rigidity (CR) and center of strength (CV) located on the opposite sides of the center of mass (CM) will have small torsional responses under seismic excitation. Copyright © 2003 John Wiley Sons, Ltd.
-
A yield displacement Distribution‐based approach for strength assignment to lateral force‐resisting elements having strength dependent Stiffness
Earthquake Engineering & Structural Dynamics, 2003Co-Authors: W. K. Tso, B. MyslimajAbstract:Recent studies have shown that for many lateral force-resisting elements (LFRE) Stiffness is dependent on strength, and as a result strength assignment to these elements would affect both the strength and Stiffness Distributions in a structure. Consequently, Stiffness Distribution cannot be considered known prior to strength assignment. This paper presents a yield displacement Distribution-based strength assignment strategy that does not require the knowledge of Stiffness Distribution prior to strength assignment. It is shown that structural systems with their center of rigidity (CR) and center of strength (CV) located on the opposite sides of the center of mass (CM) will have small torsional responses under seismic excitation. Copyright © 2003 John Wiley Sons, Ltd.
Masahiko Hirao - One of the best experts on this subject based on the ideXlab platform.
-
elastic Stiffness Distribution on polycrystalline cu studied by resonance ultrasound microscopy young s modulus microscopy
Physical Review B, 2006Co-Authors: Masahiko Hirao, Toyokazu Tada, Jiayong TianAbstract:We study an elastic-constant Distribution on a polycrystalline Cu using resonant ultrasound microscopy with a wireless-electrodeless langasite oscillator, which we originally developed for absolute quantitative determination of local Stiffness of a material. We formulate the relationship between the resonance frequency of the oscillator and material's elastic constants. Our microscopy results on each crystallite agree with those from electron-backscattering-pattern measurements except for some small grains. A softening is observed on grain boundaries, partially explaining softened small grains.
-
Elastic-Stiffness Distribution on dual-phase stainless steel studied by resonance ultrasound microscopy
Acta Materialia, 2006Co-Authors: Hirotsugu Ogi, Hiroki Niho, Masahiko HiraoAbstract:Distribution of the elastic Stiffness coefficient in a dual-phase stainless steel is studied using resonance ultrasound microscopy and electron backscattering patterns. Using a monocrystal langasite oscillator, the resonance frequency change due to contact with the material is measured contactlessly using a solenoid coil antenna. A theoretical calculation based on the contact between two anisotropic bodies is proposed to determine the contact Stiffness from the resonance frequency. The measured Stiffness Distribution is compared with that predicted from the orientation Distribution determined using the electron backscattering-pattern method. They generally agreed but the Stiffness determined by resonance ultrasound microscopy is nonuniform even in a single γ-phase grain. The nonuniformity of the chromium concentration can be a principal cause of the Stiffness Distribution.