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Search Results: 1 - 10 of 571669 matches for " R. S. S. F.;Fidelis "
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Simulation of NaCl and KCl mass transfer during salting of Prato cheese in brine with agitation: a numerical solution
Bona, E.;Carneiro, R. L.;Borsato, D.;Silva, R. S. S. F.;Fidelis, D. A. S.;Silva, L. H. Monken e;
Brazilian Journal of Chemical Engineering , 2007, DOI: 10.1590/S0104-66322007000300004
Abstract: the association of dietary nacl with arterial hypertension has led to a reduction in the levels of this salt in cheeses. for salting, kcl has been used as a partial substitute for nacl, which cannot be completely substituted without affecting product acceptability. in this study a sensorially adequate saline solution (nacl/kcl) was simultaneously diffused during salting of prato cheese in brine with agitation. the simultaneous multicomponent diffusion during the process was modeled with fick?s second generalized law. the system of partial differential equations formed was solved by the finite element method (fem). in the experimental data concentration the deviation for nacl was of 7.3% and for kcl of 5.4%, both of which were considered acceptable. the simulation of salt diffusion will allow control and modulation of salt content in prato cheese, permitting the prediction of final content from initial conditions.
Swelling Behavior of Polyacrylamide Hydrogels near Phase Transition  [PDF]
R. R. Janot Pacheco, M. E. S. R. Silva, R. G. Sousa, R. F. S. Freitas
Materials Sciences and Applications (MSA) , 2014, DOI: 10.4236/msa.2014.58063
Abstract:
Hydrogels based on acrylamide (AA) and sodium methacrylate (NMA) as ionic monomer were prepared by solution polymerization using N,N’-methylenebis(acrylamide) (MBA) or ethylene glycol dimethacrylate (EGMA) as crosslinkers and Ammonium Persulfate (APS) and N,N,N’,N’-Te-tramethyl-ethylenediamine (TMEDA) as initiators. Swelling behavior was greatly affected by NMA content near phase transition. Increasing ionic monomer concentration compared to total monomer one led to high expansion in water, oscillating around 285 g/g for MBA and 325 g/g for EGMA crosslinker, above 20% of NMA. Dynamic Light Scattering experiments were performed and, for both crosslinkers, the dynamic correlation length (ξ) decreased with increasing NMA content, contributing to diminish hydrogels spatial inhomogeneities.
The Lerner Index and Economic Efficiency  [PDF]
R. G. Chambers, R. Färe, S. Grosskopf
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.49101
Abstract: This short paper brings together two literatures: the first is the Lerner Index as a measure of imperfect competition familiar from industrial organization and the second is a measure of performance from the efficiency literature, namely the Nerlovian indicator. We show how these may be related and the resulting decomposition of the Lerner index which results.
Exact solution for the self-organized critical rainfall model
Andrade, R. F. S.;
Brazilian Journal of Physics , 2003, DOI: 10.1590/S0103-97332003000300004
Abstract: this work presents an analytical investigation for a self-organized criticality abelian model that describes basic properties of rainfall phenomena. the knowledge of the exact solution for the probability that a site topples when mass is added to any other site of the lattice leads to a large number properties of the model, including the exponent of the power law that describes presence of the events as function of their magnitude. it is shown that the model belongs to the same universality class of a first model proposed by dhar and ramaswamy (dr). however, for finite size lattices, it is found that its exponent is larger than that one for the dr model.
Emergence of log-periodic oscillations in periodic and aperiodic Ising models
Andrade, R. F. S.;
Brazilian Journal of Physics , 2000, DOI: 10.1590/S0103-97332000000400006
Abstract: this work analyzes the emergence of log-periodic oscillations in thermodynamic functions of ising models on hierarchical lattices. several situations, where the exchange interactions are periodic or aperiodic, are taken into account. high precision values for the thermodynamic functions are numerically obtained with the method of transfer matrices. fitting the curves close to the critical temperature leads to the values of the critical exponents and to the period and amplitude of the oscillations. the first two quantities are found to agree with the results predicted by the renormalization group. the amplitude of oscillations, which are minute for both periodic systems and those with aperiodic irrelevant fluctuations, are significantly enhanced for systems with aperiodic relevant fluctuations. distinct morphologies of the oscillating pattern are discussed, where oscillations are respectively sinusoidal and with a significant contribution of higher order harmonics.
Emergence of log-periodic oscillations in periodic and aperiodic Ising models
Andrade R. F. S.
Brazilian Journal of Physics , 2000,
Abstract: This work analyzes the emergence of log-periodic oscillations in thermodynamic functions of Ising models on hierarchical lattices. Several situations, where the exchange interactions are periodic or aperiodic, are taken into account. High precision values for the thermodynamic functions are numerically obtained with the method of transfer matrices. Fitting the curves close to the critical temperature leads to the values of the critical exponents and to the period and amplitude of the oscillations. The first two quantities are found to agree with the results predicted by the renormalization group. The amplitude of oscillations, which are minute for both periodic systems and those with aperiodic irrelevant fluctuations, are significantly enhanced for systems with aperiodic relevant fluctuations. Distinct morphologies of the oscillating pattern are discussed, where oscillations are respectively sinusoidal and with a significant contribution of higher order harmonics.
Exact solution for the self-organized critical rainfall model
Andrade R. F. S.
Brazilian Journal of Physics , 2003,
Abstract: This work presents an analytical investigation for a Self-Organized Criticality abelian model that describes basic properties of rainfall phenomena. The knowledge of the exact solution for the probability that a site topples when mass is added to any other site of the lattice leads to a large number properties of the model, including the exponent of the power law that describes presence of the events as function of their magnitude. It is shown that the model belongs to the same universality class of a first model proposed by Dhar and Ramaswamy (DR). However, for finite size lattices, it is found that its exponent is larger than that one for the DR model.
Hypersound Absorption of Acoustic Phonons in a Degenerate Carbon Nanotube  [PDF]
K. A. Dompreh, N. G. Mensah, S. Y. Mensah, S. S. Abukari, F. Sam, R. Edziah
Graphene (Graphene) , 2015, DOI: 10.4236/graphene.2015.43007
Abstract: Absorption of acoustic phonons was studied in degenerate Carbon Nanotube (i.e. where the electrons are found close to the Fermi level). The calculation of the hypersound absorption coefficient (\"\")?was done in the regime where \"\" (q is the acoustic phonon number and l is the electron mean free path). At T = 10K and θ > 0 (θ being scattering angle), the dependence of \"\" on acoustic wave number (q), frequency (ωq), and \"\", (Vs and VD being the speed of sound and the drift velocity respectively) were analysed numerically at n = 0,±1,±2 (where n is an integer ) and presented graphically. It was observed that when γ < 0, the maximum amplification was attained at VD = 1.1Vs which occurred at E = 51.7V·cm-1. In the second harmonics, (n = ±2), the absorption obtained was compared to experimental measurement of acoustoelectric current via the Weinreich relation and the results qualitatively agreed with each other.
Yield Evaluation of a Wheat Line with Combined Resistance to Russian Wheat Aphid and Stem Rust Race “Ug99” in Kenya  [PDF]
F. O. Amulaka, J. N. Maling’a, R. S. Pathak, M. Cakir, R. M. S. Mulwa
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.47181
Abstract:

InKenya, Russian wheat aphid (RWA) and stem rust race TTKS (“Ug99”) are the most devastating pests of wheat. Severe infestations by RWA result in yield losses of up to 90% while epidemics of “Ug99”can cause up to 100% loss. The two pests combined have seriously affected farmer incomes forcing them to rely heavily on pesticides and increasing the cost of production. This study sought to evaluate a wheat line that has been developed to be resistant to both RWA and “Ug99”by pyramiding two major resistance genes. Three varieties were used in this study: Kwale, a Kenyan high yielding commercial variety but susceptible to both RWA and “Ug99”; Cook, an Australian variety carrying stem rust resistance gene Sr36 conferring immunity to “Ug99”; and KRWA9”, a Kenyan line resistant to RWA but with poor agronomic attributes. The F1 of the double cross (DC F1) was obtained by crossing the F1 of Kwale × Cook and the F1 of Kwale × KRWA9”. The DC F1 population was subjected to sequential screening for both RWA and “Ug99”resistance. The surviving DC F

Miscibility Behavior of Polyacrylamides Poly(Ethylene Glycol) Blends: Flory Huggins Interaction Parameter Determined by Thermal Analysis  [PDF]
Maria Elisa S. R. Silva, Valdir Mano, Raquel R. J. Pacheco, Roberto F. S. Freitas
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.47A2007
Abstract:

Blends of polyacrylamide—PAM, poly(N-isopropylacrylamide)—PNIPAAm, poly(N-tert-butylacrylamide)—PTBAA, poly(N,N-dimethylacrylamide)—PDMAA and poly(N,N-diethylacrylamide)—PDEAA with poly(ethylene glycol)— PEG were prepared by casting in methanol and water at concentrations of 20 wt%, 40 wt%, 60 wt%, and 80 wt% in PEG. The miscibility of the components was studied by Differential Scanning Calorimetry—DSC. All blend systems are characterized by a single glass transition temperature (Tg), close to the Tg of the amorphous component. The Hoffman Weeks method was used to determine equilibrium melting temperature (Tm) data. The determination of the melt point depression of the blends allowed the calculation of Flory-Huggins interaction parameter (χ12) of the two polymers in the melt, by using the Nishi Wang equation. The interaction parameters, calculated for all the blends, are slightly negative and close to zero, suggesting a partial miscibility between the components.

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