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Kurujyibwami C.,College of Science and Technology, University of Rwanda | Kurujyibwami C.,Linkoping University
Journal of Physics: Conference Series | Year: 2015

We describe admissible point transformations in the class of (1+2)-dimensional linear Schrödinger equations with complex potentials. We prove that any point transformation connecting two equations from this class is the composition of a linear superposition transformation of the corresponding initial equation and an equivalence transformation of the class. This shows that the class under study is semi-normalized. © Published under licence by IOP Publishing Ltd.

Seburanga J.L.,College of Science and Technology, University of Rwanda
Journal of Sustainable Forestry | Year: 2015

Invasive species pose a serious threat to the conservation of biodiversity. Forestry is the most important driver of the introduction and spread of invasive woody plant species after horticulture. Nearly 450 invasive tree species have been recorded worldwide, amounting to more than half the world’s total invasive woody flora. Australian-native Acacia mearnsii De Wild. is one of world’s top invasive alien tree species related to forestry. The negative impacts of alien species spilling over into conservation areas because of forestry are increasingly being recognized, and we examined the context and timing of this Australian species’ arrival in Rwanda. The role of A. mearnsii in Rwanda’s colonial and postcolonial forestry and the species’ threat to biodiversity conservation are also investigated. The results suggest that A. mearnsii (a) was introduced into Rwanda between 1903 and 1918, with the earliest formal record dating back to 1941; (b) was a major forestry tree species until the late 1960s when its use in forestry declined significantly; and (c) demonstrates a comparatively higher occurrence and potential of regeneration within the understory of Eucalyptus plantations within the Congo-Nile ridge buttress; Bufundu and Bushiru; and Budaha, Ndiza, and Buberuka agro-bioclimatic zones. More recently, A. mearnsii has invaded national parks and forest reserves above 1,600 m of altitude. The most significant case was recorded at Nyungwe National Park (NNP), East Africa’s largest montane rainforest. A study of biomass and spatial patterns of this species in specific ecosystems, such as NNP, is strongly recommended in order to uphold effective conservation practices. Copyright © Taylor & Francis Group, LLC.

Seburanga J.L.,College of Science and Technology, University of Rwanda
Small-scale Forestry | Year: 2016

Based on empirical evidence from a vegetation survey, this paper investigates the occurrence of self-established populations of black wattle (Acacia mearnsii De Wild.) in various environmental contexts and identifies areas where this species could be allowed to grow as a useful plant. The frequency of occurrence of self-established black wattle was found to be comparatively high above 1600 m of altitude. Three agro-ecological zones of Rwanda (Congo Nile Crest, Non-volcanic Highlands and Central Plateau) account for 70 % of the occurrence, most of which are inside tree plantations and woodlots and natural forests. In areas of most concern to black wattle invasion (especially in proximity of natural ecosystems), the following policy approach should be considered: eradication of current occurrences and a ban on the cultivation of this species. Elsewhere, control through utilization by local communities and adaptive management in areas least vulnerable to its invasion could suffice to keep this species under check. © 2015, Steve Harrison, John Herbohn.

Asemota G.N.O.,College of Science and Technology, University of Rwanda
Proceedings - 2nd International Conference on Artificial Intelligence, Modelling, and Simulation, AIMS 2014 | Year: 2014

This paper, 'Communality performance assessment of electricity load management model for Namibia', presents a good analysis of the interval of communality. While there is only a minimum, which strengthens the author's claim of obtaining the optimal performance assessment criterion for the electricity load management model developed. Out of the 300 administered questionnaires, 127 were yielded for statistical analyses. The separate communalities obtained closely mirrored the predictors, whenever they were closer to unity. Using Borel's strong law of large numbers for analyses, it was shown that sample sizes larger than 127, produced errors, which exceeded 0.1 only once for every five runs of the process. Therefore, communality analyses provide elegant lower-bound solutions that belong to a class of nonsmooth optimisation algorithms useful for obtaining high quality exploratory and confirmatory decoupled multivariate analyses, as shown in this study. © 2014 IEEE.

Ishimwe N.,Jiangnan University | Ishimwe N.,College of Science and Technology, University of Rwanda | Daliri E.B.,Jiangnan University | Lee B.H.,Jiangnan University | And 3 more authors.
Molecular Nutrition and Food Research | Year: 2015

The use of probiotics as food components combats not only cardiovascular diseases but also many gastrointestinal tract disorders. Their health benefits along with their increased global market have interested scientists for better formulation and appropriate administration to the consumers. However, the lack of clear elucidation of their cholesterol-lowering mechanisms has complicated their proper dosage and administration to the beneficiaries. In this review, proposed mechanisms of cholesterol reduction such as deconjugation of bile via bile salt hydrolase activity, binding of cholesterol to probiotic cellular surface and incorporation into their cell membrane, production of SCFAs from oligosaccharides, coprecipitation of cholesterol with deconjugated bile, and cholesterol conversion to coprostanol have been discussed. Also, hypocholesterolemic effects on human- and animal-trial results, commonly used probiotics and synbiotics with effect on serum cholesterol regulation, types of bile salt hydrolase genes, and substrate specificities have been discussed. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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