scholarly journals PARAMETRIC AND NON-PARAMETRIC METHODS FOR THE STUDY OF THE VARIABILITY OF WAVE DIRECTIONS: APPLICATION TO THE ATLANTIC URUGUAYAN COASTS

2012 ◽  
Vol 1 (33) ◽  
pp. 14 ◽  
Author(s):  
Sebastián Solari ◽  
Miguel Ángel Losada
Keyword(s):  
Probability Distribution Function ◽  
Coastal Engineering ◽  
Coastal Processes ◽  
Stationary Probability ◽  
Antarctic Oscillation ◽  
Wave Direction ◽  
Stationary Probability Distribution ◽  
Climatic Indices ◽  
Wrapped Distributions ◽  
The Antarctic

Wave direction is a fundamental variable in coastal engineering, whether one is interested in analyzing coastal processes or designing harbor structures. In this work a mixture of circular (wrapped) distributions is introduced for modeling the non-stationary probability distribution function of mean wave directions. The proposed distribution is able to accommodate seasonal and inter-annual variability, as well the influence of several climatic indices. This function was applied to the Atlantic Uruguayan coast, finding that both the Tropical South Atlantic index and the Antarctic Oscillation index have a significant influence on the variability of the wave directions.

scholarly journals On the analysis of the limited resources queuing system under MAP arrivals

2018 ◽  
Vol 16 ◽  
pp. 01008
Author(s):  
Eduard Sopin ◽  
Konstantin Samouylov
Keyword(s):  
Blocking Probability ◽  
Queuing System ◽  
Limited Resources ◽  
System Of Equations ◽  
Stationary Probability ◽  
Equilibrium System ◽  
Vector Form ◽  
Stationary Probability Distribution ◽  
Resource Requirements ◽  
Resource Allocation Schemes

In the paper, we analyse a multiserver queuing system with discrete limited resources and random resource requirements under MAP arrivals, which can adequately model resource allocation schemes in the contemporary wireless networks. The equilibrium system of equations is derived in the vector form and is solved numerically. With stationary probability distribution, we provide formulas for the average and the variance of the occupied resources, as well as for the blocking probability. The results are illustrated by a numerical example.

The censored Markov chain and the best augmentation

1996 ◽  
Vol 33 (03) ◽  
pp. 623-629 ◽  
Author(s):  
Y. Quennel Zhao ◽  
Danielle Liu
Keyword(s):  
Markov Chain ◽  
Probability Distribution ◽  
Transition Probability ◽  
Transition Probability Matrix ◽  
Stationary Probability ◽  
Stationary Probability Distribution ◽  
The Best Approximation ◽  
Finite Matrix ◽  
Countable State ◽  
Stationary Probabilities

Computationally, when we solve for the stationary probabilities for a countable-state Markov chain, the transition probability matrix of the Markov chain has to be truncated, in some way, into a finite matrix. Different augmentation methods might be valid such that the stationary probability distribution for the truncated Markov chain approaches that for the countable Markov chain as the truncation size gets large. In this paper, we prove that the censored (watched) Markov chain provides the best approximation in the sense that, for a given truncation size, the sum of errors is the minimum and show, by examples, that the method of augmenting the last column only is not always the best.

scholarly journals The Influence of the Antarctic Oscillation (AAO) on Cold Waves and Occurrence of Frosts in the State of Santa Catarina, Brazil

Climate ◽  
2017 ◽  
Vol 5 (1) ◽  
pp. 17 ◽  
Author(s):  
Maikon Alves ◽  
Rafael Brito Silveira ◽  
Rosandro Boligon Minuzzi ◽  
Alberto Elvino Franke
Keyword(s):  
The State ◽  
Antarctic Oscillation ◽  
Santa Catarina ◽  
Cold Waves ◽  
The Antarctic

A tree-ring δ18O series from southernmost Fuego-Patagonia is recording flavors of the Antarctic Oscillation

2020 ◽  
Vol 195 ◽  
pp. 103302 ◽  
Author(s):  
Wolfgang Jens-Henrik Meier ◽  
Juan-Carlos Aravena ◽  
Ricardo Jaña ◽  
Matthias Holger Braun ◽  
Philipp Hochreuther ◽  
...  
Keyword(s):  
Tree Ring ◽  
Antarctic Oscillation ◽  
The Antarctic

STATISTICAL PROPERTIES OF INTENSITY FLUCTUATION OF SATURATION LASER MODEL DRIVEN BY CROSS-CORRELATED ADDITIVE AND MULTIPLICATIVE NOISES

2010 ◽  
Vol 24 (14) ◽  
pp. 2175-2188 ◽  
Author(s):  
PING ZHU ◽  
YI JIE ZHU
Keyword(s):  
Probability Distribution ◽  
Cross Correlation ◽  
Laser Intensity ◽  
Laser System ◽  
Stationary Probability ◽  
Stationary Probability Distribution ◽  
Model Driven ◽  
Multiplicative Noises ◽  
Laser Model ◽  
The Stability

Statistical properties of the intensity fluctuation of a saturation laser model driven by cross-correlation additive and multiplicative noises are investigated. Using the Novikov theorem and the projection operator method, we obtain the analytic expressions of the stationary probability distribution Pst(I), the relaxation time Tc, and the normalized variance λ2(0) of the system. By numerical computation, we discussed the effects of the cross-correlation strength λ, the cross-correlation time τ, the quantum noise intensity D, and the pump noise intensity Q for the fluctuation of the laser intensity. Above the threshold, λ weakens the stationary probability distribution, speeds up the startup velocity of the laser system from start status to steady work, and attenuates the stability of laser intensity output; however, τ strengthens the stationary probability distribution and strengths the stability of laser intensity output; when λ < 0, τ speeds up the startup; on the contrast, when λ > 0, τ slows down the startup. D and Q make the relaxation time exhibit extremum structure, that is, the startup time possesses the least values. At the threshold, τ cannot generate the effects for the saturation laser system, λ expedites the startup velocity and weakens the stability of laser intensity output. Below threshold, the effects of λ and τ not only relate to λ and τ, but also relate to other parameters of the system.

COASTAL ENGINEERING 2002

2002 ◽  
Vol 1 (28) ◽  
Author(s):  
Jane McKee Smith
Keyword(s):  
Sediment Transport ◽  
Coastal Management ◽  
Physical Modeling ◽  
State Of The Art ◽  
Field Measurements ◽  
Coastal Engineering ◽  
Coastal Processes ◽  
Coastal Structures ◽  
Coastal Morphology ◽  
Coastal Waves

*** Available Only Through World Scientific *** http://www.worldscibooks.com/engineering/5165.html This book contains more than 300 papers presented at the 28th International Conference on Coastal Engineering, held in Cardiff, Wales, in July 2002. It is divided into five parts: coastal waves; nearshore currents, swash, and long waves; coastal structures; sediment transport; and coastal morphology, beach nourishment, and coastal management. The papers cover a broad range of topics, including theory, numerical and physical modeling, field measurements, case studies, design, and management. Coastal Engineering 2002 provides engineers, scientists, and planners with state-of-the-art information on coastal engineering and coastal processes.

A breach too far? East Norfolk's place in William Smith's search for success.

2016 ◽  
Vol 35 (1) ◽  
pp. 145-166 ◽  
Author(s):  
Peter Riches
Keyword(s):  
Sand Dunes ◽  
Far East ◽  
Coastal Engineering ◽  
Coastal Processes ◽  
Technical Success ◽  
Engineering Project ◽  
Design Concepts ◽  
Oxford University ◽  
Local Newspapers ◽  
University Museum

William Smith (1769–1839) played an important role in the defence of the fourteen kilometers of coast between Winterton and Eccles, in East Norfolk, UK between 1803 and 1809. Although now known as a geologist, he earned much of his income as an engineer. Smith's main job was to repair the breaches in the Sandhills (sand dunes) that protected farmed lowland behind from sea flooding. At the same time, Smith became involved in several drainage projects in marshes behind the sand dunes which were instigated by ambitious and acquisitive landowners. Smith's nephew, John Phillips (1800–1874), gave a glowing but incomplete account of Smith's East Norfolk work in his Memoir. However, an analysis of the extensive archives in: the Norfolk Record Office, the William Smith Collection in the Oxford University Museum of Natural History and contemporary local newspapers has revealed that after apparent initial success, Smith's work on the Sandhills became more problematical, both technically and financially, and his relationships with local landowners, for whom he worked, became increasingly fractured. The Sandhills work was Smith's first coastal engineering project and, through a combination of his own inexperience and his oversimplification of the coastal processes, his designs did not provide a permanent solution to the erosion of the Sandhills by sea surges nor were his designs retained in subsequent years. Comparison of Smith's design concepts with those used by other contemporary engineers reveal that Smith's limited technical success came from a major earthmoving program to infill the Gaps (breaches) in the Sandhills and the adoption of care and maintenance programs to sustain the sea defences, rather than from any innovative engineering.

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