Zero Field Parameters
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Caracterização ambiental e estimativa da produção de cargas difusas da área de drenagem da represa de Itupararanga, SP / Environmental characterization and estimative of diffuse pollution of Itupararanga watershed, SP
The use of satellite images has improved the study of the land use dynamics. Land cover mapping have become fundamental tools in the assessment of landscape changes caused by human action and its influence on regional and urban planning. Computation tools such as Geographic Information Systems and hydrological models have supported these findings. The hydrol
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/05/2012
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2. Desenvolvimento e qualidade de Trichospilus diatraeae (Hymenoptera: Eulophidae) utilizando hospedeiros alternativos / Development and quality of Trichospilus diatraeae (Hymenoptera: Eulophidae) using alternative hosts
Parasitoids are important because of their diversity and they regulate populations of insects of different orders, however to use them in the field depends on studies to improve their mass rearing. The objective of this work was to study reproductive factors of Trichospilus diatraeae Cherian &Margabandhu (Hymenoptera: Eulophidae) on pupae of Anticarsia gemma
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/11/2010
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3. Novo método para estimativa do gradiente de fratura para poços de petróleo
The development of oil wells drilling requires additional cares mainly if the drilling is in offshore ultra deep water with low overburden pressure gradients which cause low fracture gradients and, consequently, difficult the well drilling by the reduction of the operational window. To minimize, in the well planning phases, the difficulties faced by the dril
Publicado em: 2010
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4. Seimic resolution and time-to-depth conversion by the common-reflection-surface (CRS) method / Resolução sismica e conversão tempo-profundidade, atraves do metodo de superficie comum de reflexão (CRS)
The demand for large multiplicities in seismic processing has always been a tough target for the professionals involved in this area. Until recently, the major effort to meet this demand has been done during seismic acquisition, which, due to high cost, is not usually implemented. Recently, the Common Reflection Surface (CRS) technique filled this gap provid
Publicado em: 2008
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5. Characterization of Cs2NaAIF6:Cr3+ and Cs2NaGaF6:Fe3+ single crystals by electron paramagnetic resonance / Caracterização dos monocristais Cs2NaAIF6:Cr3+ e Cs2NaGaF6:Fe3+ por meio de ressonancia paramagnetica eletronica
The interest in materials with large bands of absorption and luminescence is due to the possibility of their applications as tunable solid state lasers. The crystals Cs2NaAlF6:Cr3+ and Cs2NaGaF6:Fe3+ present these properties and , naturally, some of their physical characteristics, such as the crystal field , are decisive for their optical activity and should
Publicado em: 2006
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6. Processamento e interpretação de dados 2D e 3D de GPR :aplicações no imageamento de feições kársticas e estruturas de dissolução no campo de petróleo de Fazenda Belém-CE
In Fazenda Belém oil field (Potiguar Basin, Ceará State, Brazil) occur frequently sinkholes and sudden terrain collapses associated to an unconsolidated sedimentary cap covering the Jandaíra karst. This research was carried out in order to understand the mechanisms of generation of these collapses. The main tool used was Ground Penetrating Radar (GPR). Th
Publicado em: 2006
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7. Deuterium plasma focus measurements using solid state nuclear track detectors
A camera obscura technique was used to investigate the spatial distribution of fusion protons emitted from a small deuterium plasma focus device operated in its neutron-optimized regime (14 kV, 3 kJ, and 400 Pa D2 gas). An indium-foil activation detector was employed simultaneously to measure the shot-to-shot neutron yield. The camera obscura was positioned
Brazilian Journal of Physics. Publicado em: 2002-03
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8. CaracterizaÃÃo morfo-sedimentar e evoluÃÃo de curto e mÃdio prazo das praias do Pina, Boa Viagem e Piedade, Recife / JaboatÃo dos Guararapes
The high rate of human occupation in the coastal area of the metropolitan region of the city of Recife since 1960, gave rise to numerous conflicts in the use and soil management, mainly due to the lack of public policies to regulate this fragile environment. This work has the objective to reach a diagnostic view of the environmental conditions of the Pina, B
Publicado em: 2002
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9. Variabilidade dos parâmetros da equação da condutividade hidráulica em função da umidade de um latossolo sob condições de campo. / Variability of the parameters of the hydraulic conductivity as a function of soil-water content equation for a field latosol.
O presente trabalho foi realizado com o objetivo de quantificar e caracterizar a variabilidade espacial dos parâmetros equação K = Kq=0 exp(bq), determinada pelo método do perfil instantâneo. Nessa equação, Kq=0 é o coeficiente linear da reta lnK versus q ou a condutividade hidráulica (K) para o teor de água no solo (q) igual a zero e b o coeficien
Publicado em: 2002
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10. Intelligent controllers for dynamic systems with state and input constraints and subjected to model uncertainties.
This thesis deals with the control of nonlinear systems governed by nonlinear state equations of the form =f(x)+g(x)u with state and input constraints, and subjected to model uncertainties. Classical linearization methods lead to adequate results when the model is accurate and the reference signals are well-conditioned and have low amplitude. However, this m
Publicado em: 2001
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11. Nonequilibrium kinetic Ising models: phase transitions and universality classes in one dimension
Nonequilibrium kinetic Ising models evolving under the competing effect of spin flips at zero temperature and Kawasaki-type spin-exchange kinetics at infinite temperature T are investigated here in one dimension from the point of view of phase transition and critical behaviour. Branching annihilating random walks with an even number of offspring (on the part
Brazilian Journal of Physics. Publicado em: 2000-03
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12. Do caracter da ligação hidrogenica nos ferroeletricos quanticos do tipo KDP
A study of the ferroelectric phase transition in KDP-type materials and PbHPO4 -PbDPO4 pairs was carried out using the framework of a simplified Hamiltonian to explain three physical quantities namely, the critical temperature, Tc, spontaneous electric polarization, PM, at zero 0ºK and the Curie constant, Cc near Tc. Unlike the De Gennes Hamiltonian, the Ha
Publicado em: 1984