The hue and cry about the stark despoliation of the Niger Delta has been ongoing; and the issues at stake have centered mostly on the gross and glaring underdevelopment in the area despite the vast resources that have accrued to the Nigerian state from the region. Perhaps the most disturbing, is that oil exploration and exploitation in the Niger Delta is carried out without regard to internatio...

The central theme of this thesis is one-bit quantization of bandlimited signals via Sigma-Delta modulation. In this commonly used analog-to-digital conversion method, the signal of interest is represented by a ±1-valued sequence that is computed recursively from regular samples of the signal via a difference equation. The key feature of the method is that the low frequency content of the quanti...

The main purpose of this article is to offer some characterizations of $delta$-double derivations on rings and algebras. To reach this goal, we prove the following theorem:Let $n > 1$ be an integer and let $mathcal{R}$ be an $n!$-torsion free ring with the identity element $1$. Suppose that there exist two additive mappings $d,delta:Rto R$ such that $$d(x^n) =Sigma^n_{j=1} x^{n-j}d(x)x^{j-1}+Si...

The article describes semi-symbolic methods for the analysis of control and signal processing systems, including static and dynamic uncertainties. This above mentioned semi-symbolic description of uncertainties is based upon affine arithmetic. A short introduction to affine arithmetic is given. As affine arithmetic is only able to describe static uncertainties, an extension for effects of dynam...

A qualitative modelling approach is used into the description of lime-mash flow processes of an industrial lime transport machine in order to monitor and analyze its performance prior to its application. Realistic and reliable qualitative models of the lime transport system under investigation were produced offline. The results obtained from running the simulation of these models, in order to a...

Critical thinking skills are seen as one of the most important skills for researchers. Mash-Up Research Environments have the potential to activate these skills. While these environments already have their own value, this work provides a first step in answering the question of whether or not they activate thinking processes, and as a further step, what quality of thinking is activated. Consider...

Qingyu Jia 1,2 ID , Wenying Yu 2, Li Zhou 3 and Chenghua Liang 1,* 1 College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China; [email protected] 2 Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110166, China; [email protected] 3 Chinese Academy of Meteorological Sciences, China Meteorological Administration, 46 Zhongguancun...

As part of an ongoing project to unify the treatment of symmetric lenses (of various kinds) as equivalence classes of spans of asymmetric lenses (of corresponding kinds) we relate the symmetric delta lenses of Diskin et al, with spans of asymmetric delta lenses. Because delta lenses are based on state spaces which are categories rather than sets there is further structure that needs to be accou...