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Search Results: 1 - 10 of 29 matches for " Celestin Sindikubwabo "
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Abrupt Change in Sahara Precipitation and the Associated Circulation Patterns  [PDF]
Celestin Sindikubwabo, Ruolin Li, Chenghai Wang
Atmospheric and Climate Sciences (ACS) , 2018, DOI: 10.4236/acs.2018.82017
Abstract: This study investigates the changes in inter-annual summer precipitation and the relationship with the atmospheric general circulation in the Sahara Desert occurred in the last 40 years (1971-2010). The results show that the summer precipitation undergone in drought recovery with a strong abrupt change at the end of 20th century. This change in Sahara precipitation is subsequently accompanied with the changes in the atmospheric circulation. The Sahara drought recovery is associated with a significant warming in the tropical and extratropical sea surface temperature, which led to the increase in moisture budget of the tropical African monsoon. The remarkable features such as the strengthening in Arctic high and mid-latitude upper level westerly wind, weakening in subpolar low and upper tropospheric zonal wind over North Africa have shown a distinct relationship with the Sahara precipitation changes.
A Monotonicity Condition for Strong Convergence of the Mann Iterative Sequence for Demicontractive Maps in Hilbert Spaces  [PDF]
Akuchu Besheng George, Celestin Akwumbuom Nse
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.515212

Let be a real Hilbert space and C be a nonempty closed convex subset of H. Let T : C → C be a demicontractive map satisfying 〈Tx, x〉 ≥ ‖x‖2 for all x ∈ D (T). Then the Mann iterative sequence given by xn + 1 = (1 - an) xn + anT xn, where an ∈ (0, 1) \"\"n ≥ 0, converges strongly to an element of F (T):= {x ∈ C : Tx = x}. This strong convergence is obtained without the compactness-type assumptions on C, which many previous results (see e.g. [1]) employed.

On the Minimum Energy of a Linear Discrete Neutral System with Delayed Control
Celestin A. Nse
Journal of Engineering and Applied Sciences , 2012,
Abstract: Criteria for existence and the form of an optimal control are presented. It is shown that if the discrete system is relatively null controllable with constraints, the optimal control that drives the system to the origin of En is unique and Bang-Bang.
Constrained Controllability of Infinite Dimensional Systems with Single Point Delay in Control
Celestin A. Nse
Research Journal of Applied Sciences , 2012,
Abstract: In this research, we study the semi linear infinite dimensional abstract control system with single constant delay in the control given by x (t) = Ax (t) + F (x (t)) + B0u (t) + B1u (t h) with zero initial conditions x (0) = 0 , u (t) = 0 for t [-h,0) where the state x (t) takes values in a real Banach space X and the control u (t) is in another real Banach space U.
Use of systems change and health information technology to integrate comprehensive tobacco cessation services in a statewide system for delivery of healthcare  [PDF]
Sarah Moody-Thomas, Michael D. Celestin Jr., Ronald Horswell
Open Journal of Preventive Medicine (OJPM) , 2013, DOI: 10.4236/ojpm.2013.31010
Abstract: Despite the availability of effective treatments and recommendations for systems change, full application of the USPublic Health Service clinical practice guideline for the treatment of tobacco use is seldom achieved. The present report describes a comprehensive, structured approach used to implement the guideline and to integrate evidence-based cessation services into a system for delivery of health care. The PRECEDE-PROCEDE model and systems strategies were employed to design and implement the Tobacco Control Initiative (TCI), which provides evidence-based cessation services for the patients of a statewide public hospital system. For the TCI, multi-level assessments, pilot programs, electronic data collection, and performance feedback were needed to produce system-wide changes in workflow and in the quality of care for tobacco users. Although there are advances in health information technology (HIT), systems approaches are required for responding effectively to the Health Information Technology for Economic and Clinical Health (HI-TECH) Act and to standards governing use of electronic data related to treatment of tobacco use and dependence.
Variability of Future Rainfall over the Mono River Basin of West-Africa  [PDF]
Batablinlè Lamboni, Lawin Agnidé Emmanuel, Celestin Manirakiza, Zakari Moussa Djibib
American Journal of Climate Change (AJCC) , 2019, DOI: 10.4236/ajcc.2019.81008
Abstract: This study assessed the rainfall trends and changes over Mono river basin under the highest greenhouse gas emission scenario RCP8.5. Simulations of eight regional climate models (RCMs) provided by Africa-CORDEX program were considered. To analyze the performance of a set of regional climate models, the MBE (mean bias error), the RMSE (root mean square error), the volume bias (VB), correlation coefficient (R2) and the t-Test statistics were calculated. The precipitation concentration index (PCI), Mann-Kendall trend test, Theil-Sen’s slope estimator (β), and relative percentage change methods were also adopted for data analysis. Changes from the baseline period 1981-2010 were computed for far future (2061-2090 and 2071-2100). As results, the analysis herein highlighted the multi-models’ mean ability to simulate the Mono river basin rainfall adequately. Two distinct patterns emerged from the calculated PCI indicating that stations in southern basin will have moderate, irregular, and strongly irregular rainfall concentrations, whereas stations in northern basin will have irregular and strongly irregular rainfall concentrations. Significant declining in the rainfall was detected in most stations for the future period. The evolution of the monthly average rainfall amounts will be broadly characterized by a decrease and increase between 32.4 and 12% with late rainy seasons. It is understood that future changes in rainfall distribution and trends will affect the availability of water for crops, which should affect the productivity of rain fed agriculture.
A simplification functor for coalgebras
Maurice Kianpi,Celestin Nkuimi Jugnia
International Journal of Mathematics and Mathematical Sciences , 2006, DOI: 10.1155/ijmms/2006/56786
Abstract: For an arbitrary-type functor F, the notion of split coalgebras, that is, coalgebras for which the canonical projections onto the simple factor split, generalizes the well-known notion of simple coalgebras. In case F weakly preserves kernels, the passage from a coalgebra to its simple factor is functorial. This is the simplification functor. It is left adjoint to the inclusion of the subcategory of simple coalgebras into the category SetF of F-coalgebras, making it an epireflective one. If a product of split coalgebras exists, then this is split and preserved by the simplification functor. In particular, if a product of simple coalgebras exists, this is simple too.
On the Chang's group of BL-algebras
Jean B. Nganou,Celestin Lele
Mathematics , 2012,
Abstract: For an arbitrary BL-algebra L, we construct an associated lattice Abelian group that coincides with Chang's group when the BL-algebra is an MV-algebra. We prove that the Chang's group of the MV-center of any BL- algebra L is a direct summand in the above group. We also compute examples of this group.
Optimal Control of Neutral Systems with Nonlinear Base (The Maximum Principle Perspective)
Celestin A. Nse,Anthony N. Eke
Journal of Engineering and Applied Sciences , 2012,
Abstract: In this research we examine the Euclidean controllability for a neutral system with a nonlinear base given by By a careful analysis of the maximum principle, necessary and sufficient conditions for the existence and uniqueness of optimal controls are deduced. This work is a great improvement of existing works providing a relationship between the attainable and reachable sets.
Inequality of Cameroonian Households: An Analysis Based on Shapley-shorrocks Decomposition
Chameni Nembua Celestin,Miamo Wendji Clovis
International Journal of Economics and Finance , 2012, DOI: 10.5539/ijef.v4n6p149
Abstract: The objective of this study is to explain the evolution of inequality of consumption expenditures of households in Cameroon over the period 1996-2007. To achieve this, we use the Shapley-Shorrocks decomposition of inequality by subgroups and by sources of income / expenses. The application of this method to data from Cameroon shows that expenditure on food and housing explains inequality by sources, while the expenditure distribution is much more unequal in households’ headed by a man in urban area and slice aged between 31 and 50 regarding the decomposition subgroup.
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