Three-dimensional magnetoelastic shear waves in a regularly laminated structure with the properties of ferrite

1997 ◽  
Vol 33 (4) ◽  
pp. 287-292
Author(s):  
V. V. Levchenko
Keyword(s):  
Shear Waves ◽  
Three Dimensional ◽  
Laminated Structure

Shear waves in a nonlinear relaxing media: A three-dimensional perspective

2021 ◽  
Vol 149 (3) ◽  
pp. 1589-1595
Author(s):  
Giuseppe Saccomandi ◽  
Maurizio S. Vianello
Keyword(s):  
Shear Waves ◽  
Three Dimensional

THREE‐DIMENSIONAL SEISMIC MODEL STUDIES

Geophysics ◽  
1955 ◽  
Vol 20 (1) ◽  
pp. 19-32 ◽  
Author(s):  
F. K. Levin ◽  
H. C. Hibbard
Keyword(s):  
Wave Propagation ◽  
Surface Wave ◽  
Elastic Wave ◽  
Surface Waves ◽  
Shear Waves ◽  
Three Dimensional ◽  
Seismic Model ◽  
Model Studies ◽  
Ground Roll ◽  
Detector Configurations

Elastic wave propagation in a two‐layer section has been studied with a solid two‐bed model and records resembling seismograms obtained for the four possible source‐detector configurations. Numerous events are identified. Among these, the shear waves are found to be surprisingly prominent. The amplitude of the ground roll falls off approximately as [Formula: see text] This is the amplitude‐range dependence expected for a surface wave. The ability of two in‐line detectors to reduce surface waves has been demonstrated.

scholarly journals Anti-plane shear waves in periodic elastic composites: band structure and anomalous wave refraction

2015 ◽  
Vol 471 (2180) ◽  
pp. 20150152 ◽  
Author(s):  
Sia Nemat-Nasser
Keyword(s):  
Band Structure ◽  
Phase Velocity ◽  
Negative Refraction ◽  
Mass Density ◽  
Shear Waves ◽  
Variable Mass ◽  
Three Dimensional ◽  
Positive Energy ◽  
Plane Shear ◽  
Elastic Composites

For anti-plane shear waves in periodic elastic composites, it is shown that negative energy refraction can be accompanied by positive phase-velocity refraction and positive energy refraction can be accompanied by negative phase-velocity refraction , and that this can happen over a broad range of frequencies. Hence, in general, negative refraction does not necessarily require antiparallel group and phase-velocity vectors. Details are given for layered composites and the results are extended to, and illustrated for, two-dimensional periodic composites, revealing a wealth of information about the refractive characteristics of this class of composites. The composite's unit cell may consist of any number of constituents of any variable mass density and elastic modulus, admitting large discontinuities . A powerful variational-based solution method is used that applies to one-, two- and three-dimensional composites, irrespective of their constituents being homogeneous or heterogeneous. The calculations are direct, accurate and efficient, yielding the band structure, group-velocity, energy-flux and phase-velocity vectors as functions of the frequency and wavevector components, over an entire frequency band.

New Perspectives in the Microscopic Structure of Human Dura Mater in the Dorsolumbar Region

1997 ◽  
Vol 22 (2) ◽  
pp. 161-166 ◽  
Author(s):  
Miguel Angel Reina ◽  
Martin Dittmann ◽  
Andrés López Garcia ◽  
André van Zundert
Keyword(s):  
Dura Mater ◽  
External Surface ◽  
Three Dimensional ◽  
Longitudinal Direction ◽  
Collagen Fibers ◽  
Dimensional Structure ◽  
Elastic Fibers ◽  
Microscopic Structure ◽  
Laminated Structure ◽  
Parallel Fashion

Background and ObjectivesThe object of this study was to describe the three-dimensional structure of the dura mater by use of scanning electron microscopy.MethodsMicroscopic dissection of the dura mater from four fresh cadavers (aged 70, 75, 76, and 80 years) 8-12 hours after death were investigated in three different planes (longitudinal, tangential, and transverse).ResultsThe external surface of the dura mater, facing the epidural space, consisted of a network of randomly oriented fine collagen fibers. The thicker elastic fibers (2 μm in diameter) were observed on the surface of the dura. In the inner part of the dura mater, there were very fine lamellae of collagen fibers, which were bundled into thicker (4-5 μm) layers. The dura mater consisted of 78-82 layers, each layer including 8-12 very fine lamellae.ConclusionsThe fibers of the dura mater do not run in a longitudinal direction and are not arranged in a parallel fashion. Cytoarchitecturally the dura mater is a laminated structure built up from well-defined layers oriented concentrically around the medulla spinalis.

Three-Dimensional Dynamic Response of Buried Pipelines to Incident Longitudinal and Shear Waves

1985 ◽  
Vol 52 (4) ◽  
pp. 919-926 ◽  
Author(s):  
S. K. Datta ◽  
P. M. O’Leary ◽  
A. H. Shah
Keyword(s):  
Material Properties ◽  
Shear Waves ◽  
Three Dimensional ◽  
Buried Pipelines ◽  
Incident Plane ◽  
Longitudinal And Shear Waves ◽  
Induced Stresses ◽  
Dynamic Amplification ◽  
Hoop Stresses ◽  
Surrounding Soil

An exact analysis is presented here for the three-dimensional dynamics of a long continuous pipeline embedded in an elastic medium. A shell model of the pipe has been used here. It is shown that the dynamic amplification of axial and hoop stresses induced in the pipe due to incident plane longitudinal and shear waves depends crucially on the ratio of rigidities of the surrounding soil and the pipe. Induced stresses are also found to have appreciable frequency dependence for certain combinations of material properties and angles of incidence. Results presented here are also applicable to buried tunnels.

scholarly journals Thin Electric Heating Membrane Constructed with a Three-Dimensional Nanofibrillated Cellulose–Graphene–Graphene Oxide System

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1727 ◽  
Author(s):  
Chuang Shao ◽  
Zhenyu Zhu ◽  
Chuwang Su ◽  
Sheng Yang ◽  
Quanping Yuan
Keyword(s):  
Graphene Oxide ◽  
Power Density ◽  
Heat Dissipation ◽  
Three Dimensional ◽  
Electric Heating ◽  
Nanofibrillated Cellulose ◽  
Oxide System ◽  
Homogeneous Distribution ◽  
Graphene Sheets ◽  
Laminated Structure

Nanofibrillated cellulose (NFC) and graphene oxide (GO) with reinforcing and film-forming properties were employed with graphene to develop a novel and thin electric heating membrane with heat dissipation controllability. A negative charge was found on the surface of GO and NFC in aqueous dispersions, which contributed to the homogeneous distribution of the graphene sheets. The membrane had a good laminated structure with three-dimensional interaction between GO and NFC, with embedded graphene sheets. Conductivity was characterized as a function of the amount of graphene, thus giving control over to the heating power by adjusting the ratio of graphene. Subsequent electric heating tests can remove irregularities on the GO and graphene sheet, improving the laminated structure further. The temperature on the surface of the membrane presented an exponential increasing regularity with time. Under the same power density and time, the stabilized temperature rise of membranes was higher when grammage was higher, which was characterized by the linear function of the power density. Low-grammage membranes (1 and 4 g·m−2) also exhibited regular and even stabilized temperature rises. The indicated structure and heating performance of the membrane, as well as the variation induced by Joule heating, would drive its applications.

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