scholarly journals Towards a three-dimensional model of wave–ice interaction in the marginal ice zone

2010 ◽  
Vol 662 ◽  
pp. 1-4 ◽  
Author(s):  
C. M. LINTON
Keyword(s):  
Three Dimensional ◽  
Ocean Waves ◽  
Wave Spectra ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
The Past ◽  
Marginal Ice Zone ◽  
Directional Wave ◽  
Ice Floes ◽  
Made In

Over the past forty or so years, considerable advances have been made in our understanding of the effects of ocean waves on sea ice, and vice versa, with observations, experiments and theory all playing their part. Recent years have seen the development of ever more sophisticated mathematical models designed to represent the physics more accurately and incorporate new features. What is lacking is an approach to three-dimensional scattering for ice floes that is both accurate and efficient enough to be used as a component in a theory designed to model the passage of directional wave spectra through the marginal ice zone. Bennetts & Williams (J. Fluid Mech., 2010, this issue, vol. 662, pp. 5–35) have brought together a number of solution techniques honed on simpler problems to provide just such a component.

scholarly journals The Shell of V603 Aql and the Early Stages of the Nova Event

1974 ◽  
Vol 3 ◽  
pp. 509-532 ◽  
Author(s):  
H. Weaver
Keyword(s):  
Visible Light ◽  
Light Curve ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Transition Stage ◽  
Spectroscopic Observations ◽  
Early Stages ◽  
Periodic Fluctuations ◽  
Made In

Nova V603 Aql 1918 was uniquely suited for studies of the structure of its shell because of the very favorable orientation of the shell in space. Additionally, almost by chance, spectroscopic observations were made in such a way that they permitted derivation of a three dimensional model of the shell.V603 Aql, as we see from its light curve (Figure 1), was a typical fast nova which showed strong periodic fluctuations in light during the transition stage. The period of fluctuation was approximately 10 days, during which time the visible light changed by roughly 50%.

A Simplified Three-Dimensional Analysis of a Solid Rotor Induction Machine with Finite Current Sheet and Finite Stator Permeability

1974 ◽  
Vol 11 (3) ◽  
pp. 258-267 ◽  
Author(s):  
S. Basu ◽  
P. Mukhopadhyaya
Keyword(s):  
Current Sheet ◽  
Dimensional Analysis ◽  
Axial Length ◽  
Finite Thickness ◽  
Three Dimensional ◽  
Induction Machine ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Made In

The paper presents a method of analysis of a solid rotor induction machine, in which both finite stator permeability and finite thickness of current sheet, not considered so far, have been incorporated. To take the finite axial length of the machine into account, a three-dimensional model of a machine is considered and the analysis is made in rectangular co-ordinates. The method, unlike the previous ones, indicates an easier way of studying machine characteristics, even though it is more rigorous in nature.

CAD Compositive Capability Cultivation of College Students in Engineering Practice

2013 ◽  
Vol 655-657 ◽  
pp. 2174-2178
Author(s):  
Yan Cao ◽  
Hui Yao ◽  
Yu Bai ◽  
Zhou Fang
Keyword(s):  
Three Dimensional ◽  
Rolling Bearing ◽  
Engineering Practice ◽  
Research Projects ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Teaching Innovation ◽  
The Past ◽  
Model Library ◽  
Training Opportunities

How to improve students’ CAD compositive capability at their collegial stage is a very important problem. However, it is hard for colleges and universities to afford the environment that is completely oriented to engineering practice and to provide various training opportunities for the students. Based on the research and exploration in the past years, research projects are used to drive teaching innovation in the paper. Research contents, objective, problems to be solved and approach adopted are presented. Research scheme and guarantee measures are also explained. Taking the development of Common Rolling Bearing Digital Three-Dimensional Model Library for example, the approach is discussed in detail.

scholarly journals Evaluation of Slope Stability Considering the Preservation of the General Patrimonial Cemetery of Guayaquil, Ecuador

Geosciences ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 103 ◽  
Author(s):  
Fernando Morante ◽  
Maribel Aguilar ◽  
Gonzalo Ramírez ◽  
Roberto Blanco ◽  
Paúl Carrión ◽  
...  
Keyword(s):  
Slope Stability ◽  
Safety Factor ◽  
Three Dimensional ◽  
Loss Of Stability ◽  
Dimensional Model ◽  
High Susceptibility ◽  
Three Dimensional Model ◽  
Practical Procedure ◽  
Slope Mass Rating ◽  
Made In

Inefficient blasting techniques and poor closure management of the old quarry that existed during the 1970s in the area of the actual General Patrimonial Cemetery of Guayaquil resulted in an almost vertical slope of approximately 50 m in height and an intense induced fracturing that weakened the rock mass. This led to the loss of stability and increased material detachment, which damaged the infrastructure of the graveyard representing a risk to visitors and workers. The aim of this research is to evaluate the slope stability through a geotechnical analysis that allows decision-making to recover and preserve the safety of the area. In this work, we used structural measurements and observations made in the field, as well as a three-dimensional model of the slant generated by photographs taken by a drone. Slope Mass Rating (SMR) and Chinese Slope Mass Rating (CSMR) rankings were used to evaluate stability, susceptibility to rockfall was determined using a theoretical–practical procedure, and the safety factor was calculated using the Morgenstern–Price method. The analysis of the geomechanical classifications yielded a low stability value of the slope, which was in accordance with the high susceptibility to rockfall and with the low safety factor. Based on these results, we recommend the application of systematic bolt and shotcrete for stabilization.

Eine semantische Klassifizierung von Weil-Sätzen

2021 ◽  
Vol 66 (1) ◽  
pp. 297-324
Author(s):  
Sibilla Cantarini ◽  
Chiara de Bastiani
Keyword(s):  
Three Dimensional ◽  
Semantic Relations ◽  
Dimensional Model ◽  
Verb Second ◽  
Three Dimensional Model ◽  
Semantic Classification ◽  
Conceptual Relations ◽  
Comprehensive Classification ◽  
Made In

"A Semantic Classification of Weil-clauses. In the present study, we will elaborate a classification of clauses introduced by weil ‘because’; this classification combines different views on the concepts of cause and motive and their respective linguistic realization. In this paper, the three-dimensional model proposed by Sweetser (1990) will be combined with the distinction between cause and motive made in Prandi/De Santis (2011) and Prandi (2013), with the purpose of formulating a taxonomy of linguistic causality. Corpus research aimed at testing the afore-mentioned classification shows that the subordinating conjunction weil, which is usually defined as the prototypical causal subordinator in traditional grammars, introduces different conceptual relations, which would be difficult to identify without a comprehensive classification of the semantic relations introduced by this subordinator. Finally, further applications of the proposed classification involving the opposition between clauses headed by weil with verb-end and verb-second syntax will be proposed. It will be argued that the verb-second syntax serves a particular function in the encoding of semantic relations. Keywords: cause, motive, traditional grammars, semantic relations, verb-end, verb-second "

scholarly journals Service Quality Models: A Gap Study

2016 ◽  
Vol 6 (1) ◽  
pp. 464
Author(s):  
Dr. Kiran ◽  
Ajmer Singh
Keyword(s):  
Service Quality ◽  
Hierarchical Model ◽  
Three Dimensional ◽  
Review Of The Literature ◽  
Gap Model ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Quality Models ◽  
The Past ◽  
Three Components

<p class="ber"><span lang="EN-GB">During the past three-four decades, service quality becomes an important area for research. This paper makes an attempt to study different service quality models given by the key contributors in this area. The paper examines different models of service quality on the basis of the review of the literature. The models that have been analyzed in this paper are-Gronroos Model, Lehtinen and Lehtinen three-dimensional model, PZB Gap Model,</span><span lang="EN-US"> three components Model, RSQS Model and</span><span lang="EN-GB">Brady and Cronin Hierarchical model. From the review of the above models, we find out that there is a lot of work still available which can be done to fill the gap. Hence, this paper will provide an opportunity to the researcher to do research in those areas which are still left to be covered.</span></p>

Wave scattering by multiple rows of circular ice floes

2009 ◽  
Vol 639 ◽  
pp. 213-238 ◽  
Author(s):  
L. G. BENNETTS ◽  
V. A. SQUIRE
Keyword(s):  
Finite Number ◽  
Wave Scattering ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Elastic Plates ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Linear Solution ◽  
Ice Floes ◽  
The Individual

A three-dimensional model of ocean-wave scattering in the marginal ice zone is constructed using linear theory under time-harmonic conditions. Individual floes are represented by circular elastic plates and are permitted to have a physically realistic draught. These floes are arranged into a finite number of parallel rows, and each row possesses an infinite number of identical floes that are evenly spaced. The floe properties may differ between rows, and the spacing between the rows is arbitrary.The vertical dependence of the solution is expanded in a finite number of modes, and through the use of a variational principle, a finite set of two-dimensional equations is generated from which the full-linear solution may be retrieved to any desired accuracy. By dictating the periodicity in each row to be identical, the scattering properties of the individual rows are combined using transfer matrices that take account of interactions between both propagating and evanescent waves.Numerical results are presented that investigate the differences between using the three-dimensional model and using a two-dimensional model in which the rows are replaced with strips of ice. Furthermore, Bragg resonance is identified when the rows are identical and equi-spaced, and its reduction when the inhomogeneities, that are accommodated by the model, are introduced is shown.

Evolution of Directional Wave Spectra in the Marginal Ice Zone: A New Model Tested with Legacy Data

2016 ◽  
Vol 46 (10) ◽  
pp. 3121-3137 ◽  
Author(s):  
Vernon A. Squire ◽  
Fabien Montiel
Keyword(s):  
Experimental Study ◽  
Wave Spectra ◽  
Three Dimensional Model ◽  
Vast Number ◽  
Dissipative Term ◽  
Model Predictions ◽  
Marginal Ice Zone ◽  
Ice Conditions ◽  
Directional Wave ◽  
The Waves

AbstractField experimental data from a 1980s program in the Greenland Sea investigating the evolution of directional wave spectra in the marginal ice zone are reanalyzed and compared with the predictions of a new, phase-resolving, three-dimensional model describing the two-dimensional scattering of the waves by the vast number of ice floes that are normally present. The model is augmented with a dissipative term to account for the nonconservative processes affecting wave propagation. Observations reported in the experimental study are used to reproduce the ice conditions and wave forcing during the experiments. It is found that scattering alone underestimates the attenuation experienced by the waves during their passage through the ice field. With dissipation, however, the model can replicate the observed attenuation for most frequencies in the swell regime. Model predictions and observations of directional spreading are in agreement for short to midrange wave periods, where the wave field quickly becomes isotropic. For larger wave periods, little spreading can be seen in the model predictions, in contrast to the isotropic or near-isotropic seas reported in the experimental study. The discrepancy is conjectured to be a consequence of the inaccurate characterization of the ice conditions in the model and experimental errors.

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