IOSR-JAP   Volume-13 ~ Issue-2 ~ Mar. – Apr. 2021

ABSTRACT: Résumé : L'un des moyens pour suivre l'activité du volcan Nyiragongo est la détermination des quantités de gaz, notamment le dioxyde de carbone et le dioxyde de soufre, dégagés par ce volcan.
Le but poursuivi par ce travail est de pouvoir mesurer indirectement les quantités des gaz (CO2 et SO2) dégagés par le volcan Nyiragongo à partir des fonctions de modélisation mathématique reliant ces quantités de gaz à la température dans les fissures de ce volcan. A partir des valeurs de mesure de la température et des quantités de CO2 et de SO2 dans certains sites de fissures du volcan Nyiragongo fournies par l'Observatoire Volcanologique de Goma (OVG), nous avons élaboré une base des données en deux parties. Chaque partie est constituée des variables quantités de l'un des gaz (CO2 ou SO2) avec la variable température. Cette base des données a été traitée par le logiciel SPSS pour générer, par régression linéaire ou non linéaire, des fonctions de modélisation des quantités de CO2 et SO2 en fonction de.....

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ABSTRACT: Résumé : Contexte : la température du sol sur le plan mondial est entrain de croitre et cette température s'est accrue dans notre pays à Kinshasa et nous venons de le montrer aussi pour le Sud-Kivu en R.D Congo où la température du sous-sol à 2m a augmentée de 0.7 °C. Sans vouloir dire que cette élévation de température dans le sous-sol est le résultat du changement climatique, nous voulons savoir si cette température n'a pas d'impact sur l'évapotranspiration (ETP), traceur fiable de la dégradation et/ou de la déforestation des sols. Matériel et méthodes : dans cette étude, nous utilisons la Télémétrie par Satellite des données ASCII NOAA sur une période allant de 1920 à 2020 pour les paramètres : la température du sol de 100 à 200cm en °C et l'évapotranspiration en Tonne d'H2O par Hectare et par jour. Les données télémétrées par GIOVANNI sur les centroïdes des 8 Territoire du Sud-Kivu...

Keywords; ETP, température du sol, gradient de température

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[3]. « Utilisation des Données Spatiales en Appui à la Géomatique pour la Modélisation de la Climatologie, de la Limnimétrie et de la Marée-graphie en RD Congo »
[4]. Albert KABASELE YENGAYENGA, 2019, Modélisation du Fleuve Congo et Marées Océaniques de Muanda Par Climatologie Spatiale, , ed. revue des Géosciences et Innovations Spatiales de l'Institut Géographique du Congo IGC
[5]. Alexis RUFFENACH , 2013, Observation et modélisation de l'érosion des nuages magnétiques solaires par reconnexion magnétique, thèse , Université de Toulouse.

ABSTRACT: The study investigated the effect of thickness on the thermal properties of three different bulk wood products of celtis family: celtis zenkeri, celtis philipensis and celtis mildreadii. Using the modified double lee's disc apparatus incorporated with automatic data logger. The thermal conductivity of the samples obtained increase as the thickness increases. The result shows that celtis phillipensis records the highest thermal conductivity values of 0.3968Wm-1K-`1. The values of the thermal conductivity and thickness obtained for the samples fall within the range of (0.3337 – 0.3968) Wm-1K-1 and (6.79 -6.88) mm respectively. This range fall within the thermal conductivity values of common insulator material used in solar collector. The particle sizes for the specific wood samples exhibit low thermal conductivity could be comparable with materials used as industrial insulators. Hence, the selected wood materials could be useful for applications in industrial insulating devices, if properly harnessed into particle sizes.

Key words: Thermal conductivity, wood materials, solar devices and automatic data logger.

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[4]. Korkut, S., Aytin A., Taşdemir Ç. and Gurău L. (2013). The Transverse Thermal Conductivity Coefficients of Wild Cherry Wood Heat-Treated Using The Thermowood Method.

ABSTRACT: All photons and electrons have predetermined quantum states (Hidden Variables). During photon polarization and electron magnetic polarization processes, their quantum states (Hidden Variables) can be changed either by adding energy to electron or reducing energy from photon to become a new quantum states (Field Dependent Hidden Variables). For further transformation (polarization processes), according to Principle of Normalization, a normalized quantum energy states can be achieved (Normalized Field Dependent Hidden Variables). Since Bell Inequality based on Set Theory can only be applied on the same sample space, therefore, Bell Inequality applying on the mixed sample spaces (the actual measurement) cannot be used to prove if Hidden Variables or Field Dependent Hidden Variables exist or not. Furthermore, both entangled photons and electrons have the same Hidden.......

[Keywords]; Quantum Entanglement, Superposition, EPR Paradox, Bell's Inequality, Hidden Variables, Electron Spin, Photon Spin, Optical Polarization, Magnetic Polarization, Schrödinger Cat.

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[4]. Edward T. H. Wu. "Hidden Variables versus Bell's Inequality and Conflicts of Superposition, Complementarity and Entanglement in Quantum Mechanics." IOSR Journal of Applied Physics (IOSR-JAP), 12(3), 2020, pp. 24-35.
[5]. Edward T. H. Wu. "Photon Polarization and Entanglement Interpreted by Yangton and Yington Theory." IOSR Journal of Applied Physics (IOSR-JAP), 12(3), 2020, pp. 01-06..

ABSTRACT: Alternative magnetic field creates induced currents in an unclosed conductor located in the magnetic field. Magnetic interaction between current elements of the conductor occurs with violating Newton third law accordingly which the so-called Abraham's force created by displacement current between ends of conductor acts on the unclosed conductor. It this case, there must be some hidden momentum and reactive force that cancel the electromagnetic momentum and the Abraham's force. The magnetic field of induction current in the conductor does not act on the source of the external magnetic field and does not create a force that would compensate for Abraham's force. With some orientation of the conductor, it becomes lighter. This allows to study in detail the behavior of an unclosed conductor in an external magnetic field. The average value of the usual forces acting on a closed or unclosed conductor in an external alterative magnetic field is zero

Key word - Abraham's force, Hidden momentum, Unclosed conductor, External magnetic field, Alternative current.

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[5]. Gerasimov S.A Alternative Electric Current in Dynamics of Unclosed Conductor. International Journal of Engineering Research and Applications. 2020; 10(6); 8-11

ABSTRACT: Background: Over the years, radiographic examinations is the most used diagnostic tools in Nigerian health care system but most diagnostic examinations carried out do not have records of patient doses. Lack of adequate information on patient doses has been a major hindrance in quantifying the radiological risk associated with radiographic examinations. This study aimed at estimating dose – area product (DAP) of patient examined in X – ray units in selected hospitals in Southern Nigeria. Materials and Methods: The standard projections selected are Chest Posterior-Anterior (PA), Abdomen Anterior-Posterior (AP), Pelvis AP, Pelvis Lateral (LAT), Skull AP/PA, Skull LAT, Lumbar Spine AP, Lumbar Spine, LAT. Measurement of entrance surface dose (ESD) was carried out using thermo luminescent dosimeter (TLD). Measured ESDs were converted into DAP using the beam area of patients......

Keywords: dose – area product, optimization, patient doses, radiographic examinations

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ABSTRACT: Solid State Oxide Fuel Cells (SOFC) offer clean and efficient power generation systems with good fuel flexibility, high power density, low pollution, modularity and high energy conversion efficiency. The conventional SOFCs operate at a higher temperature of about 1000 ⁰C. This limits the use of materials to be used for their construction. Presently, the major research effort ongoing is to develop the low cost intermediate temperature (IT) SOFC. These cells work in the temperature range of 500–800 ⁰C with power densities as high as possible. The main difficulty in developing these SOFCs is the degrading performance of fuel cells owing to lower ion conduction of the electrolyte. The selection of materials for different cell components is based on sufficient chemical and structural stability at intermediate temperatures, suitable electrical-conducting properties for various cell functions, minimal reactivity among cell components and matching thermal expansion of various components. In this review, comparative study of component materials of SOFC, effect of processing on properties of components of SOFC and various designs of SOFC have been compared.

Keywords:SOFC, anode, cathode, electrolyte, interconnect

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