Results 21 to 30 of about 1,794,321 (297)

First report and preliminary evaluation of cassava root necrosis in Angola [PDF]

open access: yes, 2020
Open Access ArticleCassava is a main staple food for 800 million people world-wide. Production is limited by pest and pathogens. The most devastating cassava viruses are Cassava Brown Streak Virus and Uganda Cassava Brown Streak Virusboth causing severe ...
Bakelana, Z.   +11 more
core   +1 more source

Jasminum cuneatum Jongkind (Oleaceae), a new species from Guinee, Liberia and Cote d'Ivoire [PDF]

open access: yes, 2010
The new species Jasminum cuneatum Jongkind (Oleaceae) from western Africa is described here. It differs from]. paucinervium Benth., a species that occurs in the same area and that is the most easily confused, by its cuneate and not rounded or cordate ...
Jongkind, C.C.H.
core   +4 more sources

L'activité de butinage des Apoides sauvages (Hymenoptera Apoidea) sur les fleurs de maïs à Yaounde (Cameroon) et réflexions sur la pollinisation des graminées tropicales [PDF]

open access: yesBiotechnologie, Agronomie, Société et Environnement, 2002
The gatering activity of wild bees (Hymenoptera Apoidea) on flowers of maize at Yaound (Cameroon) and further considerations on pollination of the tropical Gramineae.
Tchuenguem-Fohouo F.N.   +2 more
doaj  

Optimal pumping scheduling for municipal water storage systems

open access: yesEnergy Reports, 2022
In this paper, bulk water abstractions and a purification process in terms of water pumped energy consumption, is modelled and simulated. The study proposes an optimal energy consumption-rate management system, using real-time data. The aim is to achieve
P.B. Ngancha, K. Kusakana, E.D. Markus
doaj   +1 more source

THE ECONOMIC INFLUENCE OF FRANCE IN WEST AND CENTRAL AFRICA

open access: yesBaltic Journal of Economic Studies
Despite the decolonisation process, France has retained a considerable degree of influence over its former colonies in Sub-Saharan Africa. However, in recent years, this influence has diminished markedly.
Juraj Ondriaš   +2 more
doaj   +1 more source

A review of solar and air-source renewable water heating systems, under the energy management scheme

open access: yesEnergy Reports, 2022
Although traditional electric storage tank water heaters (ESTWHs) are the most frequently used systems in the world, they are known to be among the highest energy consumers, due to their inefficiency in converting electrical energy to thermal energy ...
Tsholofelo Priscilla Gaonwe   +2 more
doaj   +1 more source

Plant Variety Protection [PDF]

open access: yes, 2014
The harmonization of seed policies and regulation in the ASARECA member countries is the first step toward creating a seed market that is large enough to attract investment by local and international investors who will provide the quantity, quality and ...
Eastern and Central Africa Programme for Policy Analysis
core  

Parent‐to‐Child Information Disclosure in Pediatric Oncology

open access: yesPediatric Blood &Cancer, EarlyView.
ABSTRACT Background Despite professional consensus regarding the importance of open communication with pediatric cancer patients about their disease, actual practice patterns of disclosure are understudied. Extant literature suggests a significant proportion of children are not told about their diagnosis/prognosis, which is purported to negatively ...
Rachel A. Kentor   +12 more
wiley   +1 more source

Design and control challenges of hybrid, dual nozzle gas turbine power generating plant: A critical review

open access: yesEnergy Reports, 2021
The provision of sustainable energy is one of the critical challenges currently facing the power sector and gas turbine power production has established itself as one of the more viable sources of reliable energy.
Frank Kulor   +2 more
doaj   +1 more source

Who’s Forest? Implications of Different Management Regimes for Sustainable Utilisation and Minimisation of Conflicts [PDF]

open access: yes, 2014
Productive and sustainable agriculture can only result from the sustainable utilization and management of the natural resources that carry it. This, however, is usually obstructed by conflicts among intervening decision makers and their different ...
Eastern and Central Africa Programme for Policy Analysis
core  

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