IRA International Journal of
The journal regularly reviews the works on basic sciences, applied sciences, agriculture science, and food & nutritional sciences.
ISSN 2455-4499 | DOI 10.21013/jas
CAS CODEN: IJASNG | OCLC No. 953515792 | ZDB No. 2861287-5
Publication Frequency: Quarterly
In this paper, the authors have applied a numerical method to determine the optimum insulation thickness of the tow plaster plane material. The influence of the exchange coefficients at the level of the two faces of the material has been highlighted. The optimum insulation thickness of the material is at the area where the thermal resistance value of the material is the maximum. The authors added the relative thermal resistance to show how the optimum insulation thickness changes when the exchange coefficients change values.
This paper deals with building envelope thermal performance through a comparative study of the use of two types of construction materials, such as CEB and cement blocks, in order to introduce the use of double walls in sustainable buildings’ construction. The building envelope participates in providing thermal comfort to users and in the optimal management of building energy consumption. This study begins with a survey of public preferences for building materials used in Burkina Faso. The results indicate that 76% of the people surveyed opt for cement blocks over local materials. Concerning the thermal and specific energy performance, three variants of building envelope were studied: CEB walls, cement blocks and the double-wall (CEB + Cement blocks). It appears that the CEB walls are more efficient than the cement block walls. The introduction of double envelopes leads to the thermal resistance of 357.37m².K/W and reduces the heat flow from 85.32% to 90.24% compared to the wall made with CEB and cement blocks. This approach, which consists in mixing construction materials for good thermal insulation, allows improving the envelope thermal performance and the overall building energy performance.
Image segmentation plays a crucial role in recognizing image signification for checking and mining medical image records. Brain tumor segmentation is a complicated assignment in medical image analysis. It is challenging to identify precisely and extract that a portion of the image has abnormal tissues for further diagnosis and analysis. The method of segmenting a tumor from a brain MRI image is a highly concentrated medical science community field, as MRI is non-invasive. In this survey, brain MRI images’ latest brain tumor segmentation techniques are addressed a thoroughgoing literature review. Besides, surveys the several approved techniques regularly applied for brain tumor MRI segmentation. Also, highlighting variances among them and reviews their abilities, pros, and weaknesses. Various approaches to image segmentation are described and explicated with the modern participation of several investigators.
In order to make up its energy deficit and reduce its energy imports from neighbouring countries, Benin is opting for the construction of photovoltaic solar micro-power plants in the sunniest regions and to consider injecting it into the existing electricity grid if this locally produced energy is not entirely consumed. With this in mind, a decentralised electricity production project has been initiated. In particular, the project, which is the subject of this presentation, aims to simulate and analyse the impacts of injecting 25 MW of photovoltaic energy production into the existing national electricity grid of the Société Béninoise d’Energie Electrique (SBEE). For this purpose, the dimensioning of the 25MW power plant has been carried out and injected at a specific point of the 20kVA line of the existing electricity network in the NEPLAN software environment, while respecting the requirements for injecting photovoltaic energy into an existing electricity network. Only extreme operating configurations have been studied: the synchronous hollow and synchronous point configuration. Simulation results showed overloads on certain transformer stations in the network, which indicates that adjustments must be made before the actual injection of the electricity produced. Besides, the power grid did not experience any disturbance in the voltage plan and power flows. Finally, the simulations carried out led to the conclusion that the integration of solar PV plants will make it possible to limit the import of energy from Ghana and Nigeria.