The impact of laterally coupled grating microstructure on effective coupling coefficients

2010 ◽  
Vol 21 (13) ◽  
pp. 134015 ◽  
Author(s):  
R Millett ◽  
K Hinzer ◽  
A Benhsaien ◽  
T J Hall ◽  
H Schriemer
Keyword(s):  
Coupling Coefficients ◽  
Effective Coupling ◽  
The Impact

scholarly journals Seasonal variability of SST fronts and winds on the southeastern continental shelf of Brazil

2019 ◽  
Vol 69 (11-12) ◽  
pp. 1387-1399 ◽  
Author(s):  
Huan-Huan Chen ◽  
Yiquan Qi ◽  
Yuntao Wang ◽  
Fei Chai
Keyword(s):  
Continental Shelf ◽  
Wind Stress ◽  
Seasonal Variability ◽  
Detection Algorithm ◽  
Coupling Coefficients ◽  
Seafloor Topography ◽  
Wind Stress Curl ◽  
Large Coupling ◽  
The Impact ◽  
Sst Fronts

Abstract Fourteen years (September 2002 to August 2016) of high-resolution satellite observations of sea surface temperature (SST) data are used to describe the frontal pattern and frontogenesis on the southeastern continental shelf of Brazil. The daily SST fronts are obtained using an edge-detection algorithm, and the monthly frontal probability (FP) is subsequently calculated. High SST FPs are mainly distributed along the coast and decrease with distance from the coastline. The results from empirical orthogonal function (EOF) decompositions reveal strong seasonal variability of the coastal SST FP with maximum (minimum) in the astral summer (winter). Wind plays an important role in driving the frontal activities, and high FPs are accompanied by strong alongshore wind stress and wind stress curl. This is particularly true during the summer, when the total transport induced by the alongshore component of upwelling-favorable winds and the wind stress curl reaches the annual maximum. The fronts are influenced by multiple factors other than wind forcing, such as the orientation of the coastline, the seafloor topography, and the meandering of the Brazil Current. As a result, there is a slight difference between the seasonality of the SST fronts and the wind, and their relationship was varying with spatial locations. The impact of the air-sea interaction is further investigated in the frontal zone, and large coupling coefficients are found between the crosswind (downwind) SST gradients and the wind stress curl (divergence). The analysis of the SST fronts and wind leads to a better understanding of the dynamics and frontogenesis off the southeastern continental shelf of Brazil, and the results can be used to further understand the air-sea coupling process at regional level.

Dynamical properties of scaling solutions in teleparallel dark energy cosmologies with nonminimal coupling

2017 ◽  
Vol 26 (09) ◽  
pp. 1750103 ◽  
Author(s):  
Mihai Marciu
Keyword(s):  
Dark Energy ◽  
Power Law ◽  
Scalar Fields ◽  
Teleparallel Gravity ◽  
Inverse Power ◽  
Coupling Coefficients ◽  
Potential Term ◽  
Inverse Power Law ◽  
The Stability ◽  
The Impact

The dynamical aspects of scaling solutions for the dark energy component in the theoretical framework of teleparallel gravity are considered, where dark energy is represented by a scalar field nonminimally coupled with the torsion and with a boundary term, where the boundary coupling term represents the divergence of the torsion vector. The behavior and stability of the scaling solutions are studied for scalar fields endowed with inverse power law potentials and with exponential potentials. It is shown that for scalar fields endowed with inverse power-law potentials, the stability conditions are not affected by the coupling coefficients. For the scalar fields endowed with exponential potentials, two cases are studied: at first, we have considered an infinitesimal deviation from the scaling solution in the corresponding Klein–Gordon equation, and the impact of distinct coupling coefficients on the stability of the solution are analyzed. Secondly, the potential-free case is considered where the dominance of the coupling terms over the potential term is analyzed, discussing the validity of the corresponding particular solution.

scholarly journals Herd Behavior and Financial Crashes: An Interacting Particle System Approach

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Vincenzo Crescimanna ◽  
Luca Di Persio
Keyword(s):  
Financial Markets ◽  
Private Information ◽  
Particle System ◽  
Physical Models ◽  
Herd Behavior ◽  
Coupling Coefficients ◽  
Market Returns ◽  
Interacting Particle ◽  
The Impact ◽  
With Memory

We provide an approach based on a modification of the Ising model to describe the dynamics of stock markets. Our model incorporates three different factors: imitation, the impact of external news, and private information; moreover, it is characterized by coupling coefficients, static in time, but not identical for each agent. By analogy with physical models, we consider thetemperatureparameter of the system, assuming that it evolves with memory of the past, hence considering how former news influences realized market returns. We show that a standard Ising potential assumption is not sufficient to reproduce the stylized facts characterizing financial markets; this is because it assigns low probabilities to rare events. Hence, we study a variation of the previous setting providing, also by concrete computations, new insights and improvements.

Method for determination of effective coupling coefficients in (1 + 1)GTWave fibers

2018 ◽  
Vol 45 ◽  
pp. 363-367
Author(s):  
Mariya G. Slobozhanina ◽  
Anton N. Slobozhanin ◽  
Alexander V. Bochkov ◽  
Dmitry V. Khmelnitsky
Keyword(s):  
Coupling Coefficients ◽  
Effective Coupling

Lower Extremity Coupling Parameters during Locomotion and Landings

2005 ◽  
Vol 21 (4) ◽  
pp. 359-370 ◽  
Author(s):  
Mark D. Tillman ◽  
Chris J. Hass ◽  
John W. Chow ◽  
Denis Brunt
Keyword(s):  
Lower Extremity ◽  
High Speed ◽  
Physical Therapist ◽  
Task Demands ◽  
Tibial Rotation ◽  
Coupling Coefficients ◽  
Foot Motion ◽  
Coupling Parameters ◽  
The Impact ◽  
Foot Alignment

During ballistic locomotion and landing activities, the lower extremity joints must function synchronously to dissipate the impact. The coupling of subtalar motion to tibial and knee rotation has been hypothesized to depend on the dynamic requirements of the task. This study was undertaken to look for differences in the coupling of 3-D foot and knee motions during walking, jogging, and landing from a jump. Twenty recreationally active young women with normal foot alignment (as assessed by a licensed physical therapist) were videotaped with high-speed cameras (250 Hz) during walking, jogging, hopping, and jumping trials. Coupling coefficients were compared among the four activities. The ratio of eversion to tibial rotation increased from the locomotion to the landing trials, indicating that with the increased loading demands of the activity, the requirements of foot motion increased. However, this increased motion was not proportionately translated into rotation of the tibia through the subtalar joint. Furthermore, the ratio of knee flexion to knee internal rotation increased significantly from the walking to landing trials. Together these findings suggest that femoral rotation may compensate for the increase in tibial rotation as the force-dissipating demands of the task increase. The relative unbalance among the magnitude of foot, tibial, and knee rotations observed with increasing task demands may have direct implications on clinical treatments aimed at reducing knee motion via controlling motion at the foot during landing tasks.

Properties of Three Phase Magneto-Electro-Thermo-Elastic Composites

2019 ◽  
Vol 969 ◽  
pp. 9-15
Author(s):  
Hardik Patel ◽  
Pavan Kumar Penumakala ◽  
Dhruv Patel
Keyword(s):  
Magnetoelectric Effect ◽  
Epoxy Composite ◽  
Effective Property ◽  
New Product ◽  
Longitudinal Direction ◽  
Coupling Coefficients ◽  
Effective Coupling ◽  
Property Variation ◽  
Three Phase ◽  
Elastic Composites

Three phase composites that consists of piezoelectric and piezomagnetic fibers embedded inan elastic matrix phase exhibits new product properties such as magnetoelectric effect, pyroelectric andpyromagnetic effect, which are absent in individual phases. In this work, simple analytical expressionsare developed based on strength of materials approach to find these effective coupling coefficients. In amicro scale rectangular representative volume element (RVE) of a layered type three phase composite,series connectivity is assumed between fiber and matrix layers along transverse direction and parallelconnectivity is assumed along longitudinal direction. The analytical model is validated with otherhomogenisation methods and effective property variation of BaTiO3-CoFe2O4-Epoxy composite andLiNbO3-CoFe2O4- Epoxy composite are discussed.

Magnetomechanical Properties of Circumferentially Field-Annealed Metglas® 2605SC Cylinders

1994 ◽  
Vol 360 ◽  
Author(s):  
J. B. Restorff ◽  
M. Wun-Fogle ◽  
A. E. Clark ◽  
Thu-Van T. Luu
Keyword(s):  
Coupling Coefficient ◽  
Longitudinal Mode ◽  
Bias Field ◽  
Coupling Coefficients ◽  
Effective Coupling ◽  
Impedance Measurements ◽  
Annealing Temperatures ◽  
Large Numbers ◽  
Demagnetizing Factor ◽  
A Current

AbstractWe have measured the magnetomechanical coupling coefficient of Metglas®2605SC (Fe81B13.5C2) ribbons that were annealed into 1.27 and 0.8 cm diameter cylinders. Lengths ranged from 0.6 to 5 cm. A novel furnace was constructed in which a cylindrical magnetic field was supplied by a current carrying copper rod. During the annealing, a 300 A current created a circumferential field of more than 6400 A/m. Annealing temperatures ranged from 380 to 420 ºC. Large shifts in both the optimum bias field and the coupling coefficient as a function of length and diameter were found due to demagnetizing effects. Impedance vs. frequency measurements show large numbers of modes, some of which are field dependent. Effective coupling coefficientsof the lowest order longitudinal mode were calculated from impedance measurements by using k2 = 1-f2r/f2a, where fr, and fa. are the resonant and antiresonant frequencies respectively. Coupling coefficients for 5 cm long cylinders were as high as 0.58. When the demagnetizing factor is taken into account, we find material coupling coefficients as high as 0.89.

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