Application de modèles non paramétriques sous R pour l'analyse et le suivi de la qualité de l'eau

Application de modèles non paramétriques sous R pour l'analyse et le suivi de la qualité de l'ea

An Optimum Electrons Number Generated in Microwaves Plasma Gas Discharge

The objective of this study is the estimation of plasma density and the parameters that control this density in a metallic circular geometric waveguide by using microwave plasma gas discharge for plasma generation. Propagation in unlimited plasma with and without collision has been shortly treated to uncover the collision effect and the cutoff frequency. In limited plasma, in a circular waveguide, we show some waves modes that can propagate in this geometric structure.  Electrons number is the main objective as it constitutes the rate of reactive species for any material treatment.  Its variation with wave sources and with the dielectric constant of the tube medium has been treated. In conclusion the design of any microwave plasma gas discharge, will be based on these parameters that are essential for guiding electromagnetic waves in a circular geometric structure for an optimum electromagnetic energy transport and as a result for an optimum reactive species rate for use in our daily life need.

Analytical Evaluation of Unfairness Problem in Wireless LANs

The number of users using wireless Local Area Network is increasing exponentially and their behavior is changing day after day. Nowadays, users of wireless LAN are using huge amount of bandwidth because of the explosive growth of some services and applications such as video sharing. This situation imposes massive pressure on the wireless LAN performance especially in term of fairness among wireless stations. The limited resources are not distributed fairly in saturated conditions. The most important resource is the access point buffer space. This importance is a result of access point being the bottleneck between two different types of networks. These two types are wired network with relatively huge bandwidth and wireless network with much smaller bandwidth. Also the unfairness problem is keep getting worse because of the greedy nature Transmission Control Protocol (TCP). In this paper, we conduct a comprehensive study on wireless LAN dynamics and proposed a new mathematical model that describes the performance and effects of its behavior. We validate the proposed model by using the simulation technique. The proposed model was able to produce very good approximation in most of the cases. It also gave us a great insight into the effective variables in the wireless LAN behavior and what are the dimensions of the unfairness problem.Comment: Journal of Telecommunications,Volume 1, Issue 1, pp105-112, February 201

Plasma Technology Contributions to Energy Transition and Environment

A fair and reliable energy transition is needed for the depleted fossil fuel, energy supply and climate concern the world knows now days. Alize climate is adequate for hybrid green hydrogen projects especially with the new innovations and the promising plasma technology solutions for direct seawater hydrogen production. Non thermal plasma with its low temperature and effectiveness of its energetic electrons toward the inert carbon dioxide becomes the new interest for biomass and CO2 conversion to energy. This conversion is in fact a great reduction of CO2 emission that could be considered as another value added.   Gas hydrate risk and geohazard could be mitigated to be a value added and one of the various storages for CO2 emission reduction to atmosphere. Plasma technology in waste treatment has advantage on the conventional methods in pollution prevention. Non thermal plasma in water treatment is still in laboratory scale but has shown great progress by its effeteness of its generated reactive species

Understanding Al Qaeda

This book controversially argues that Al Qaeda has clear aims, and that the only way to defeat it is to engage with its arguments in a serious way. Since the publication of the first edition in 2006, Mohamedou has brought the text right up-to-date. Starting with Al Qaeda's creation almost twenty years ago, and sketching its global mutation, Mohamedou explains that there is a cogent strategy to Al Qaeda's actions. He shows that the 'war on terror' is failing, only serving to recruit more terrorists to Al Qaeda's cause. He also puts forward a case for how the international community can best respond. Arguing that it is dangerous to dismiss Al Qaeda as illogical and irrational, this incisive and original book is important for policy-makers and ideal for undergraduates in international relations, Middle East studies and peace/conflict studies

A Theory of ISIS

The Islamic State of Iraq and Syria has been the subject of intense scrutiny in the West. Considered by many to be the most dangerous terrorist organisation in the world, it has become shrouded in numerous myths and narratives, many emanating from the US, which often fail to grasp its true nature. Against these narratives, Mohammad-Mahmoud Ould Mohamedou presents a bold new theory of ISIS. By tracing its genealogy and documenting its evolution in Iraq and Syria, he argues that ISIS has transcended Osama Bin Laden’s original project of Al Qaeda, mutating into an unprecedented hybrid form that distils postcolonial violence, postmodernity and the emerging post-globalisation international order. This book analyses ISIS from a social sciences perspective and unpacks its dynamics by looking beyond superficial questions such as its terrorist nature and religious rhetoric. It transforms our understanding of ISIS and its profound impact on the very nature of contemporary political violence