Vitória, Espirito Santo, Brazil
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- SourceAvailable from: Fabrina Bolzan Martins[Show abstract] [Hide abstract]
ABSTRACT: The diameter and height growth model is one of three submodels used for simulating individual tree growth. In Brazil, there are few studies on the dimensional growth of individual trees be they native or exotic species, despite their potential. This study aimed to evaluate diameter and height growth models for individual trees for eucalyptus stands and to validate the best fitting model. Tree diameter and height data were obtained from 48 permanent plots of unthinned stands of Eucalyptus grandis × Eucalyptus urophylla hybrid located in northern Brazil. The evaluation of the diameter and height growth models was based on adjusted coefficient of determination, standard error of estimate as a percentage, trend, root mean square error and Akaike Information Criterion. Analysis also included distribution of residual percentage, statistical significance and signs of the coefficients. The Lundqvist-Korf model provided the most accurate estimates for diameter and height growth, in comparison with the other models, providing better statistical values, greater proximity to observed values and better distribution of residual percentages. The use of this type of model is feasible and can result in significant improvements in the accuracy of yield estimates.
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ABSTRACT: Low-field (LF) nuclear magnetic resonance (NMR) is a very versatile technique that has increasingly shown its value, especially in research involving crude oil. In the field of viscosity and American Petroleum Institute (API) gravity research, physicochemical properties are of great interest to the industry because the first parameter can be an obstacle for production, whereas the latter is used to assess and market the product. Thus, models of viscosity and API gravity were developed in the state of Espı́rito Santo using the transverse relaxation time (T2) and relative hydrogen index (RHI) of postsalt crude oil. The models showed a good degree of reliability for 50 samples (R2 > 0.96) with viscosity ranging from 23.75 to 1801.09 mPa·s and API gravity from 16.8 to 30.6. A set of more than 15 “unknown” samples was used for validation, with values calculated by the API and viscosity compared to those obtained by the American Society for Testing and Materials (ASTM) 7042-04 standards. Finally, this study proposes a new way to classify oil through T2 and RHI with the possibility of simultaneously estimating the aforementioned physicochemical properties on the basis of a single quick and reliable measurement.
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ABSTRACT: Seven species of the genus Eucalyptus were studied cytogenetically (E.deanei, E. dunni, E. grandis, E. maculata E. propinqua, E. saligna and E. tereticornis).The species showed a symmetrical karyotype with 2n=22 chromosomes,with chromosome length ranging from 0.58 m to 1.39 m. Karyotypic analysis indicated homogeneity of morphology and of chromosome number for most of the species of this genus studied here, although casual disploid species with 2n=24 have been found in previous studies. According to these data, a basic number of x=11 was established for this genus. The evolutionary tendency probably occurred by structural alterations (deletions, duplications, additions and translocations) and in some cases by aneuploid chromosome alterations.
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