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Kinetic parameters for thermal decomposition of hydrazine
(2013-09-01)
The propulsion of most of the operating satellites comprises monopropellant (hydrazine - N2H4) or bipropellant (monometilydrazine - MMH and nitrogen tetroxide) chemical systems. When some sample of the propellant tested ...
Analysis of physical phenomena associated with asteroid deect by kinetic impact
(2021-01-01)
We have as objective for the present work, to study the use of a kinetic impact technique as a way to deect asteroids that may present some risk of collision with the Earth at a certain moment, or even the interest in ...
Study of biosorption of rare earth metals (La, Nd, Eu, Gd) by Sargassum sp. biomass in batch systems: Physicochemical evaluation of kinetics and adsorption models
(2009-12-28)
This work evaluated kinetic and adsorption physicochemical models for the biosorption process of lanthanum, neodymium, europium, and gadolinium by Sargassum sp. in batch systems. The results showed: (a) the pseudo-second ...
Stable and metastable ferroelectric polarization analyzed by the ramp voltage technique
(2002-12-01)
The study of the stable and the metastable ferroelectric polarization of poly(vinylidene fluoride), PVDF, was performed using two successive equal sign ramp voltages, mediated by a short-circuit period. Rates from 10 V/s ...
Drying of persimmon: Mathematical model for diffusivity as a simultaneous function of moisture content and shrinkage
(Isnt Tecnologico Veracruz, 2001-01-01)
Fresh persimmon has a high moisture content (about 85% wet basis) making it highly perishable and requiring adequate drying conditions to obtain an acceptable dehydrated product. Drying kinetics of persimmon cv. Rama Forte ...
Mathematical analysis and simulations involving chemotherapy and surgery on large human tumours under a suitable cell-kill functional response
(2013-02-01)
Dosage and frequency of treatment schedules are important for successful chemotherapy. However, in this work we argue that cell-kill response and tumoral growth should not be seen as separate and therefore are essential ...
Kinetics of zinc status in patients with IDDM
(John Libbey Eurotext, 1996-01-01)
Kinetics of martensitic phase decomposition in the Cu-10wt.%Al alloy with Ag additions
(2008-11-24)
The study of the kinetics of martensitic phase decomposition in the Cu-10wt.%Al alloy with Ag additions showed that the presence of Ag retarded the eutectoid decomposition reaction and enhanced martensite stabilization. ...
The submicroscopic level of chemistry: Analyzing learning objects to help the teacher in the process of teaching and learning
(2016-11-21)
Many knowledge covered in the discipline of chemistry, especially the submicroscopic level, require teachers to use didactic resources to assist them during the process of teaching and learning. In view of this concern, ...