Relaxation lengths and half-thickness values of different types of wood were determined using gamma radiation from 60 C0 source. Results show that oxystigma (Oxystima spp) has the highest relaxation length of 23.810cm, while mangrove (Rhizoohora spp) has the least relaxation length of 1.247 cm. Results also show that Oxystima (Oxystima spp) has the highest half thickness value of 16.500 cm and Mangrove (Rhizophora spp) has the least half-thickness value of 0.864 cm. Two mathematical models have been developed for the prediction or determination of density ρ, variation with relaxation length and half thickness value of wood. A good agreement (greater than 80% in most cases) was observed between the measured values and the predicted ones (models 1 and 2).
The thermodynamics properties of a quantum harmonic oscillator and four level oscillator systems are evaluated. These results lead to the exact value for the entropy of the system which corresponds to the second law of thermodynamics. We also show the numerical results for the harmonic and four level oscillators and it is in good agreement with the one obtained before in the literature.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.