IOSR-JAP   Volume-16 ~ Issue-1 ~ Jan. – Feb. 2024

ABSTRACT: Résumé La présente étude porte sur l'irradiation éventuelle de pierres rocheuses exploitées dans les carrières de Kinsuka et Lutendele, à Kinshasa-Ouest. Spécifiquement, nous avons déterminé le taux d'irradiation de roches utilisées dans la construction immobilière de bâtisses ainsi que les conséquences impactant sur la santé humaine de casseurs de pierres.
Pour ce, nous avons diligenté une enquête auprès des artisans qui opérant dans des carrières artisanales et ou industrielles, aussi procéder à l'analyse dans les laboratoires de l'Université Pédagogique Nationale à Kinshasa des échantillons de pierres prélevées, en fixant à 5 % le taux estimatif de mesures physiques réellement observées.....

Keywords: Carrière, MPR, Radioactivité, Roche, TANAR 5

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ABSTRACT: Glass sample of zinc lithium tungsten antimony borophosphate: (45-x) P2O5:10ZnO:10Li2O:10WO3:10Sb2O3:15B2O3:xTm2O3. (where x=1,1.5 and 2 mol%) have been prepared by melt-quenching technique. The amorphous nature of the prepared glass samples was confirmed by X-ray diffraction. DTA curve was analysed to evaluate the glass transition temperature (Tg), onset crystallization temperature (Tc),melting temperature(Tm) and hence study the thermal properties. Optical absorption and fluorescence spectra were recorded at room temperature for all glass samples. Judd-Ofelt intensity parameters Ωλ (λ=2, 4 and 6) are evaluated from the intensities of various absorption bands of optical absorption spectra. Using these intensity parameters various radiative properties like spontaneous emission probability, branching ratio, radiative life time and stimulated emission cross–section of various emission lines have been evaluated

Keywords: ZLTABP Glasses, Optical Properties, Judd-Ofelt Theory, Rare earth ions.

[1]. Ding, Dashuang, Gao,J.,Zhang,S.,Duo, L.(2020). The Photoluminescence Properties Of Pr3+-Yb3+ Co-Doped Gallo-Germanate Glasses And Glass Ceramics As Energy Converter.J.Lumin.226,117512.
[2]. Vighnesh,K.R.,Ramya, B.,Nimitha, S.,Wagh, A.,Sayyed,M.I.,Sakar, E.,Yakout, H.A. And Dahshan, A.(2020). Structural, Optical, Thermal, Mechanical, Morphological And Radiation Shielding Parameters Of Pr3+Doped Zaifb Glass Systems, Optical Materials 99,109512.
[3]. Damodaraiah, S.,Prasad, V. R.,Lakshmi, R.P.V.And Ratnakaram, Y.C.(2019). Luminescence Behaviour And Phonon Sideband Analysis Of Europium Doped Bi2o3 Based Phosphate Glasses For Red Emitting Device Applications, Opt. Mat. 92, 352-358.
[4]. Kaur, R., Khanna,A.(2020).Photoluminescence And Thermal Properties Of Trivalent Ion-Doped Lanthanum Tellurite Anti- Glass Composite Samples, J. Lum., 225, 117375.
[5]. Meena, S.L.(2022).Spectral And Raman Analysis Of Eu3+Doped In Zinc Lithium Cadmium Magnesium Borophosphate Glasses, Iosr Journal Of Applied Physics,14,39-44.

ABSTRACT: There is no internationally valid description for sustainable materials. Such resources restore progress capability, reduce pollution, and have a negligible impact on fitness and environment. There is an increasing need for sustainable materials due to environmental concerns. The subdivisions responsible for the most pollution are automobiles and aircraft exhaust, home applications like air conditioners and refrigerators due to toxic cooling managers, and the microchip subdivision where end of life mechanisms have a major impact on the environment. However, these environmental influences can be mitigated using progressive alternative resources. Replacing conservative thick raw materials with frivolous blends or amalgams with higher strength
to weight ratios as well as improved useful properties.....

Keywords: Lightweight blends and composites, green material blends, green inhibitors for corrosion applications, reuse of Industrial and bio waste in composites development,'' recycling of composites.

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ABSTRACT: The solvatochromism, excited state dipole moment and preferential solvation studies of antibiotic agents namely sulfamethoxazole (SMX) and Trimethoprim (TMP) have been carried out using UV-visible absorption and fluorescence techniques. The absorption and fluorescence spectra of these molecules reveal the notable spectral shifts corresponding to changes in solvent polarity. Further, a profound understanding of the solvatochromic behavior of antibiotic agents has been comprehended based on Lippert-Mataga, Reichardt's, Kamlet-Traft and Catalan's linear.....

Keywords: Antibiotic agents, dipole moment, preferential solvation, Solvatochromism

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ABSTRACT: Maxwell's equations accounting for diffusion current was derived. Maxwell's equations are used to derive Klein-Gordon equation by replacing the electric field intensity by the wave function. Anew quantum equation which accounts for relativistic rest mass energy beside potential energy as well as medium friction is also derived.....

Keywords: Maxwell's equations, massive photon

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ABSTRACT: Based on Graviton Radiation and Contact Interaction, a critical size cluster of gravitons (mc) are used to calculate the three physical constants: c, G and ħ by Newton's Law of Universal Gravitation and kinetic energy and photon energy equations, which subsequently are used for calculations of Plank Length, Time and Mass. By assuming mc = 1048 myy (Wu's Unit Mass), it is calculated that the mass of the critical size cluster of gravitons (mc) is about 1043 Gev (1016kg, 100 million times smaller than earth 1024 kg), the wavelength (lc) is about 10-11 m (UV light), and the period of the wave (tc) is about 10-20 s. Also, Wu's Unit Mass is about 10-5 Gev (100 times smaller than Up Quark 2.3 Mev), Wu's Unit Length is about 10-43 m and Wu's Unit Time is about 10-52 s. As a result, Planck to weight ratios as well as improved useful properties.....

Keywords: Planck Length, Planck Time, Planck Mass, Planck Units, Planck Constant, Wu's Pair, Wu's Unit Length, Wu's Unit Time, Wu's Unit Mass, Newton's Law of Universal Gravitation, Graviton Flux, Graviton Radiation, Wu's Spacetime Equation

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