On the relationship between magnetostatic wave energy and dispersion characteristics in ferrite structures

In the present work, the relationship between Romanian wave power and the distance to the shoreline is evaluated, by taking also into account the performances of some wave energy converters. Several reference sites located on northern, centre and southern part of this area were taken into account, the wave energy being assessed at 5 km, 15 km and 30 km from the shore. More important resources were noticed close to the Vama Veche (in south) were an average of 4.27 kW/m is reported offshore. As we go from shore to offshore, the wave variations may reach a maximum of 7.7% in the case of the Navodari site (centre), while a 3.3% is expected for Vama Veche. In the case of the wave generators, three types of systems (Seabased, Pelamis and Wave Dragon) were considered, that cover a rated capacity ranging from 15 kW to 7000 kW. For the Saint George s ite (north), the power production is insignificant being located close to zero, while in terms of the capacity factor a maximum of 0.12% may be expected from the Seabased system. The capacity factor significantly increases as we go to south, being reported during winter time values close to 3% for Pelamis system or 6% in the case of Seabased, respectively.

Download Full-text

SUSPENDED SEDIMENT DISCHARGE ON A NON-TIDAL COAST

Coastal Engineering Proceedings ◽

10.9753/icce.v18.79 ◽

1982 ◽

Vol 1 (18) ◽

pp. 79 ◽

Cited By ~ 1

Author(s):

J.P. Coakley ◽

M.G. Skafel

Keyword(s):

Field Study ◽

Suspended Sediment ◽

Wave Energy ◽

Sediment Discharge ◽

Sand Beach ◽

Data Set ◽

Longshore Transport ◽

Suspended Sediment Concentrations ◽

Tidal Sand ◽

The Relationship

A field study was conducted on a non-tidal sand beach to measure the relationship between wave energy and the longshore transport of suspended sediment. The range of suspended sediment concentrations was similar to that reported elsewhere. The relation between longshore transport and longshore energy flux derived from this data set is about half that amount predicted by such widely quoted sources as Komar and Inman (1970).

Download Full-text

Dispersion characteristics of surface magnetostatic wave with dissipation

Electromagnetic field and materials (fundamental physical research) »with international participation ◽

10.12737/22892 ◽

2016 ◽

Author(s):

Герус ◽

Sergey Gerus ◽

Анненков ◽

A. Annenkov

Keyword(s):

Dispersion Curve ◽

Wave Number ◽

Magnetostatic Wave ◽

Dispersion Characteristics ◽

High Attenuation ◽

Inverse Dispersion ◽

Maximum Value ◽

Surface Wave Propagation ◽

Surface Magnetostatic Wave ◽

Dispersion Branch

It is shown that the dispersion characteristics of spin surface waves with dissipation unlike undamped waves have the wave number maximum value at which there is a reversal in the dispersion curve of wavenumber downward. This forms the upper branch of the dispersion curve with the inverse dispersion and high attenuation, which gives rise to ambiguous depending on the frequency of the wave vector. Lower primary dispersion branch corresponds to waves with a direct dispersion, attenuation is proportional to the small parameter of dissipation. However, near the wave number maximum value the attenuation coefficient of the waves sharply increases. Some angular and frequency limits of the of surface wave propagation are changed as well.

Download Full-text

Critical-level behaviour of ion cyclotron waves

Journal of Plasma Physics ◽

10.1017/s0022377800010163 ◽

1979 ◽

Vol 22 (2) ◽

pp. 361-376 ◽

Cited By ~ 16

Author(s):

J. F. McKenzie

Keyword(s):

Energy Flux ◽

Wave Energy ◽

Critical Level ◽

Magnetized Plasma ◽

Ion Cyclotron Waves ◽

Line Resonance ◽

Ion Cyclotron ◽

Wave Energy Flux ◽

Relationship Of ◽

The Relationship

This paper provides an analysis of the propagation characteristics of ion cyclotron waves in a magnetized plasma whose density varies in a direction perpendicular to the ambient magnetic field. It is shown that the component of the wave energy flux across the density stratification is conserved except at a critical level (which is associated with a resonance singularity in the wave equation) at which the jump in the wave energy flux is balanced by wave absorption by the plasma. The relationship of this behaviour with field line resonance is briefly discussed, as is its possible relevance to ULF waves propagating in the vicinity of the earth's plasmapause.

Download Full-text

Forced Combustion Characteristics Related to Different Injection Locations in Unheated Supersonic Flow

Energies ◽

10.3390/en12091746 ◽

2019 ◽

Vol 12 (9) ◽

pp. 1746 ◽

Cited By ~ 1

Author(s):

Chae-Hyoung Kim ◽

In-Seuck Jeung

Keyword(s):

Supersonic Flow ◽

Flow Field ◽

Plasma Jet ◽

Injection Rate ◽

Combustion Characteristics ◽

Main Flow ◽

Dispersion Characteristics ◽

Gas Sampling ◽

Combustion Performance ◽

The Relationship

This work focuses on forced combustion with regards to the relationship between vent mixer models and several injection locations in unheated supersonic flow. A plasma jet torch was used to ignite the hydrogen-air mixture in a laboratory-scaled combustor duct. The flow field of the combustion was visualized with pressure and gas-sampling measurements. The vent mixers indicate good dispersion characteristics of the mixture for both parallel and normal 1 injections. However, forced combustion is dominantly governed by the injection rate toward the plasma jet (hot source) because the combustible region is restricted under the cold main flow. For this reason, the parallel injection, which provides the hydrogen-air mixture directly toward the plasma jet, shows good combustion performance. The normal 1 injection interacted with the vent mixers and shows slightly good combustion performance. Lastly, the normal 2 injection is little affected by the vent mixers and has poor combustion performance.

Download Full-text

RELATIONSHIP BETWEEN ALONGSHORE WAVE ENERGY AND LITTORAL DRIFT IN THE MID-WEST COAST AT TAIWAN

Coastal Engineering Proceedings ◽

10.9753/icce.v17.75 ◽

1980 ◽

Vol 1 (17) ◽

pp. 75

Author(s):

Ho-Shong Hou ◽

Chung-Pan Lee ◽

Lung-Hui Lin

Keyword(s):

Wave Energy ◽

Monsoon Season ◽

Unit Length ◽

Geographical Location ◽

Transport Rate ◽

High Mountain ◽

Breaking Wave ◽

Littoral Drift ◽

The Relationship ◽

The Waves

Based on the wave pattern, the geographical location and the disposition of rivers, the littoral drift moves predominantly from NE to SW direction in section II as shown in Fig. 1. Seven rivers of rapid stream bring tremendous amount of sediments from the high mountain to the nearshore of this section in typhoon season (i.e. from June to September). But for the winter monsoon season, i.e. from October to the next April, the waves induced by NE monsoons migrate littoral drift from North toward South. Applying the energy approach for unidirectional steady flow derived by Bagnold(1963), the theoretical relationship between the littoral immersed weight transport rate and the alongshore breaking wave energy is found out. It reveals that the relationship is not strictly linear, i.e. the larger part of the alongshore breaking wave energy is supplied for transporting the sediment as the former increases. But for a coast having a steady oceanographical condition, the relationship could be considered as linear relation since the alongshore breaking wave energy is not varying very much. In this paper, the study of littoral drift vs wave energy at the Taichung Coast from the Ta-Chia River to the Ta-Tu River will be carried out. Using the wave records gained by the ultrasonic wave gauge at 19m depth and the littoral drift quantity obtained from long-term observation, the relationship between alongshore breaking wave energy and littoral immersed weight transport rate is found out. First, the waves which have the same direction are summed up. Then from "THE WAVE CHARACTER COMPUTING PROGRAM", the incident directions of these wave groups at 19m depth are determined. Then the alongshore breaking wave energy per unit time per unit length of beach could be calculated by the same PROGRAM.

Download Full-text

The contribution of wind-wave energy at sea bottom to the modelling of rhodolith beds distribution in an off-shore continental shelf

Mediterranean Marine Science ◽

10.12681/mms.22462 ◽

2020 ◽

Author(s):

SABRINA AGNESI ◽

ALDO ANNUNZIATELLIS ◽

ROBERTO INGHILESI ◽

GIULIA MΟ ◽

ARIANNA ORASI

Keyword(s):

Wave Energy ◽

Wind Wave ◽

Wind Waves ◽

Surface Wind ◽

Western Mediterranean ◽

Benthic Habitat ◽

North West ◽

Western Mediterranean Sea ◽

Sea Bottom ◽

The Relationship

The study aims to investigate the relationship between the presence of rhodolith beds and the effect on the shelf bottom boundary layer due to the action of surface wind waves. The study area is situated off-shore and north-west of Elba Island in the Western Mediterranean Sea, an area known to be characterized by rhodolith beds. A binomial logistic regression model is used in order to analyse the relationship between wind-wave energy at sea bottom, bathymetry and rhodolith bed occurrence. The results indicate a positive correlation between rhodolith bed occurrence and wave energy, while the relation with bathymetry is weaker in all the trials. The wave energy confidence interval associated to the rhodolith bed probability is also estimated, thereby informing on wind wave energy values required for the modelling of this particular benthic habitat in off-shore shelf areas.

Download Full-text