Fracionamento físico do solo em estudos de matéria orgânica.

Fracionamento físico: base conceitual; Método densimétrico: fração leve (FL-livre); Fração leve oclusa (FL-oclusa); Fração pesada (FP); Método granulométrico; Fracionamento em COM-secundários; Fracionamento COM-primários.bitstream/item/38820/1/LV20023.pdfDocumento online

Partição do carbono decomposto do reservatório ativo no simulador century: análise de sensibilidade

bitstream/item/66210/1/32006.pdfFERTBIO

Uniformidade de maturação dos frutos no cacho de macaúbas nativas do pantanal e cerrado.

o presente trabalho teve como objetivo avaliar a uniformidade de maturação dos frutos no cacho em macaúbas de ocorrência natural nos biomas Pantanal e Cerrado

Effect of anisotropy and destructuration on behavior of Haarajoki test embankment

This paper investigates the influence of anisotropy and destructuration on the behavior of Haarajoki test embankment, which was built by the Finnish National Road Administration as a noise barrier in 1997 on a soft clay deposit. Half of the embankment is constructed on an area improved with prefabricated vertical drains, while the other half is constructed on the natural deposit without any ground improvement. The construction and consolidation of the embankment is analyzed with the finite-element method using three different constitutive models to represent the soft clay. Two recently proposed constitutive models, namely S-CLAY1 which accounts for initial and plastic strain induced anisotropy, and its extension, called S-CLAY1S which accounts, additionally, for interparticle bonding and degradation of bonds, were used in the analysis. For comparison, the problem is also analyzed with the isotropic modified cam clay model. The results of the numerical analyses are compared with the field measurements. The simulations reveal the influence that anisotropy and destructuration have on the behavior of an embankment on soft clay

Atributos microbiológicos, físicos e químicos do solo em cultivos de mandioca sob manejo orgânico.

bitstream/item/66205/1/32001.pdfFERTBIO

Testing characteristics of grid forming converters part III : inertial behaviour

On the path towards an energy system powered entirely by Renewable Energy Sources (RES), power electronic converters will have to take over more and more functionalities from synchronous generators to ensure a stable and secure operation of the power grid. Moreover, it is widely recognised that the use of Grid Forming Converters (GFC) is necessary to fully meet these requirements. Over the last years, different concepts have been developed to achieve grid forming characteristics of static power converters. The next essential step is to agree on an exact definition and specification of GFC electrical behaviour as well as to define a suitable conformity assessment procedure. For this purpose, standardised testing guidelines for GFC are needed to assess those functionalities, which are relevant for dynamic grid stability. As a British-German joint work of the two research projects Battery-VSM and VerbundnetzStabil, the first draft of such guidelines is being currently developed. One of the necessary characteristics which makes converter a GFC is its ability to provide inertial response during the dynamic frequency changes in the system. This paper focuses on how to demonstrate and quantify an inertia-equivalent behaviour of a GFC. The response to a transient system event is quantified in terms of a damping factor D as well as an equivalent inertia constant H. A few alternative methods are proposed for empirical estimation of those parameters accompanied by selected laboratory test results and practical considerations