REIS, Regis. Development of a computer code for performance analysis of monolithic uranium-molybdenum fuel plates under irradiation in power reactors. 2019. 139 p. Tese (Doutorado em Tecnologia Nuclear)-Instituto de Pesquisas Energéticas e Nucleares)-IPEN-CNEN/SP. São Paulo The objective of this work is the development of a computer program to analyze the performance of monolithic fuel plates of uranium-molybdenum when subjected to operating conditions under steady state in pressurized light water reactors. As a result of this effort, it was developed the computer program PADPLAC-UMo, which perform thermal and mechanical analysis of uranium-molybdenum monolithic fuel plates taking into account the physical, chemical and irradiation effects which these fuels plates are subjected in operating conditions under steady state. The PADPLAC-UMo program was developed according to structured programming technique and using the FORTRAN 2003 programming language. The verification of the results provided by the program was performed by comparing the results provided by the code with data obtained from the literature, which proved to be extremely scarce. Due to this fact, the verification of the code was complemented by means of analytical calculations and data provided by computational simulations executed with the ANSYS finite element program. The verification of the results provided by the code showed that the models implemented provide results compatible with the data obtained through analytical calculations and computational simulations using the ANSYS program.
BACKGROUND: A plethora of bacteria-fungal interactions occurs on the extended fungal hyphae network in soil. The mycosphere of saprophytic fungi can serve as a bacterial niche boosting their survival, dispersion, and activity. Such ecological concepts can be converted to bioproducts for sustainable agriculture. Accordingly, we tested the hypothesis that the well-characterized beneficial bacterium Serratia marcescens UENF-22GI can enhance their plant growth-promoting properties by combination with Trichoderma longibrachiatum UENF-F476. RESULTS: The colony and cell interactions demonstrated S. marcescens and T. longibrachiatum compatibility. Bacteria cells were able to attach, forming aggregates- biofilms and migrates through fungal hyphae network. Bacterial migration through growing hyphae was confirmed using two-compartment Petri dishes assay. Fungal inoculation increased the bacteria survival rates into the vermicompost substrate over the experimental time. Also, in vitro indolic compound, phosphorus, and zinc solubilization bacteria activities increased in the presence of the fungus. In line with the ecophysiological bacteria fitness, tomato and papaya plantlet growth was boosted by bacteria-fungi combination applied under plant nursery conditions. CONCLUSION: Mutualistic interaction between mycosphere-colonizing bacterium S. marcescens UENF-22GI and the saprotrophic fungi T. longibrachiatum UENF-F467 increased the ecological fitness of the bacteria alongside with beneficial potential for plant growth. A proper combination and delivery of compatible beneficial bacteria-fungus represent an open avenue for biological enrichment of plant substrates technologies in agricultural systems.
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