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Search Results: 1 - 10 of 154 matches for " Catastrophe "
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An Electrostatic Catastrophe Machine as an Attosecond Pulse Generator  [PDF]
Andrey Gitin
Optics and Photonics Journal (OPJ) , 2014, DOI: 10.4236/opj.2014.412034
Abstract: The generation of an attosecond pulse in the ultraviolet range is described in the terms of the catastrophe theory. A simple criterion of tunneling is proposed. The criterion allows constructing the quasiclassical model of the generator of attosecond laser pulses based on the interaction of an electric field of extremely powerful femtosecond pulse with the valence electron in the potential well of the gas atom.
Are chaos and catastrophe theories relevant to environmental sciences?
John Kaihong KAMMorrison Hill,P O Box,Hong Kong,
John
,Kaihong,KAM

环境科学学报(英文版) , 1992,
Abstract: Data acquired in the area of Environmental Sciences are by their very nature often discontinuous and abrupt. As such, the mathematical theories of catastrophe and chaos may be of use in analyzing such scientific data and in formulating mathematical models.
Rien ne va plus: les jeux sont faits
Enrico Euli
S&F_scienzaefilosofia.it , 2012,
Abstract: “Catastrophe” happens and grows not only when “natural” disasters and hurricanes turn our lives upside down, but also when we live life as a fake play.Nowadays, human beings are cheating: they deny and remove the catastrophe, trying to survive.This is the reason why, the risk of human extinction is progressively increasing. Will “the pedagogy of catastrophes” save us?
Efficient Algorithm for Railway Tracks Detection Using Satellite Imagery
Ali Javed,Khuram Ashfaq Qazi,Muazzam Maqsood,Khurram Ali Shah
International Journal of Image, Graphics and Signal Processing , 2012,
Abstract: Satellite imagery can produce maps including roads, railway tracks, buildings, bridges, oceans, lakes, rivers, etc. In developed countries like USA, Canada, Australia, Europe, images produced by Google map are of high resolution and good quality. On the other hand, mostly images of the third world countries like Pakistan, Asian and African countries are of poor quality and not clearly visible. Similarly railway tracks of these countries are hardly visible in Google map. We have developed an efficient algorithm for railway track detection from a low quality image of Google map. This would lead to detect damaged railway track, railway crossings and help to schedule/divert locomotive movements in order to avoid catastrophe.
La questione morale dei cambiamenti climatici
Stefano Caserini
S&F_scienzaefilosofia.it , 2012,
Abstract: Though a chorus of voices has risen to deny the alarm about climate changes during last years, the great majority of the scientific community believe that without further commitment and action to reduce greenhouse gas emissions, due to human activities the world will have to face a series of climate changes dangerous both for people and the Earth ecosystems. Climate change is thus an ethical issue from many points of view, mainly because those who are and will be most negatively affected are the least responsible for having caused the problem.
Fault Lines: Narrative, Catastrophe and the Lisbon Earthquake of 1755
Medeiros, Paulo de
Ellipsis , 2007,
Abstract:
Narration and Catastrophe: The 1755 Earthquake
Buescu, Helena Carvalh?o
Ellipsis , 2007,
Abstract:
Fitting the Cusp Catastrophe in R: A cusp Package Primer
Raoul P. P. P. Grasman,Han L. J. van der Maas,Eric-Jan Wagenmakers
Journal of Statistical Software , 2009,
Abstract: Of the seven elementary catastrophes in catastrophe theory, the “cusp” model is the most widely applied. Most applications are however qualitative. Quantitative techniques for catastrophe modeling have been developed, but so far the limited availability of flexible software has hindered quantitative assessment. We present a package that implements and extends the method of Cobb (Cobb and Watson 1980; Cobb, Koppstein, and Chen 1983), and makes it easy to quantitatively fit and compare different cusp catastrophe models in a statistically principled way. After a short introduction to the cusp catastrophe, we demonstrate the package with two instructive examples.
An Improved Catastrophic Genetic Algorithm and Its Application in Reactive Power Optimization  [PDF]
Ouyang Sen
Energy and Power Engineering (EPE) , 2010, DOI: 10.4236/epe.2010.24043
Abstract: This paper presents an Improved Catastrophic Genetic Algorithm (ICGA) for optimal reactive power optimization. Firstly, a new catastrophic operator to enhance the genetic algorithms’ convergence stability is proposed. Then, a new probability algorithm of crossover depending on the number of generations, and a new probability algorithm of mutation depending on the fitness value are designed to solving the main conflict of the convergent speed with the global astringency. In these ways, the ICGA can prevent premature convergence and instability of genetic-catastrophic algorithms (GCA). Finally, the ICGA is applied for power system reactive power optimization and evaluated on the IEEE 14-bus power system, and the application results show that the proposed method is suitable for reactive power optimization in power system.
Research on the Risk Associated with Rural Drinking Water Safety Based on Catastrophe Theory  [PDF]
Chao Wang, Fu-Quan Ni, Yu Deng, Lin-Lin Jiang
Journal of Water Resource and Protection (JWARP) , 2011, DOI: 10.4236/jwarp.2011.36045
Abstract: In this study, based on the analysis of the catastrophic risk of rural drinking water, with the representative villages in Ya’an as study objects and setting the four evaluation standards: water quality, water quantity, the Guarantee Probability for water Supply and the Convenience Level of the Access to Water Supply as the ba- sic framework, a Rural Drinking Water Safety Assessment was developed (RDWSA). Research showed that Catastrophe Theory was applicable in the RDWSA. Adding RDWSA based on Catastrophe Theory to the supportive system for decision-making in Ecological Hydrographic Management Decision Support System of Ya’an helped obtain the rank and results of RDWSE by the automatic calculation of programs, which could assist the risk assessment and risk management associated with rural drinking water in Ya’an.
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